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Re: assert failed: (mp->mnt_iflag & IMNT_GONE) == 0



Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
ASan: Unauthorized Access in mount_domount

[ 271.2231459] panic: ASan: Unauthorized Access In 0xffffffff81c87e17: Addr 0xffffa50013427700 [8 bytes, read, PoolUseAfterFree]

[ 271.2393148] cpu0: Begin traceback...
[ 271.2431196] vpanic() at netbsd:vpanic+0x282 sys/kern/subr_prf.c:293
[ 271.2931262] panic() at netbsd:panic+0x9e sys/kern/subr_prf.c:1043
[ 271.3231268] kasan_report() at netbsd:kasan_report+0x8f kasan_code_name sys/kern/subr_asan.c:168 [inline]
[ 271.3231268] kasan_report() at netbsd:kasan_report+0x8f sys/kern/subr_asan.c:200
[ 271.3531286] __asan_load8() at netbsd:__asan_load8+0xac kasan_shadow_8byte_isvalid sys/kern/subr_asan.c:370 [inline]
[ 271.3531286] __asan_load8() at netbsd:__asan_load8+0xac kasan_shadow_check sys/kern/subr_asan.c:420 [inline]
[ 271.3531286] __asan_load8() at netbsd:__asan_load8+0xac sys/kern/subr_asan.c:1207
[ 271.3831307] mount_domount() at netbsd:mount_domount+0x737 mount_checkdirs sys/kern/vfs_mount.c:678 [inline]
[ 271.3831307] mount_domount() at netbsd:mount_domount+0x737 sys/kern/vfs_mount.c:824
[ 271.4131246] do_sys_mount() at netbsd:do_sys_mount+0x758 sys/kern/vfs_syscalls.c:620
[ 271.4431285] compat_40_sys_mount() at netbsd:compat_40_sys_mount+0xbd sys/compat/common/vfs_syscalls_40.c:88
[ 271.4831288] sys___syscall() at netbsd:sys___syscall+0x10e sy_call sys/sys/syscallvar.h:65 [inline]
[ 271.4831288] sys___syscall() at netbsd:sys___syscall+0x10e sys/kern/sys_syscall.c:90
[ 271.5131280] syscall() at netbsd:syscall+0x25a sy_call sys/sys/syscallvar.h:65 [inline]
[ 271.5131280] syscall() at netbsd:syscall+0x25a sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 271.5131280] syscall() at netbsd:syscall+0x25a sys/arch/x86/x86/syscall.c:138
[ 271.5231232] --- syscall (number 21 via SYS_syscall) ---
[ 271.5352703] netbsd:syscall+0x25a:
[ 271.5453746] cpu0: End traceback...
[ 271.5453746] fatal breakpoint trap in supervisor mode
[ 271.5544789] trap type 1 code 0 rip 0xffffffff80220a4d cs 0x8 rflags 0x282 cr2 0x40cf30 ilevel 0 rsp 0xffffa5019dc678c0
[ 271.5651217] curlwp 0xffffa50012b66540 pid 6974.8005 lowest kstack 0xffffa5019dc602c0
Stopped in pid 6974.8005 (syz-executor.0) at    netbsd:breakpoint+0x5:  leave
?
breakpoint() at netbsd:breakpoint+0x5
db_panic() at netbsd:db_panic+0x105 sys/ddb/db_panic.c:69
vpanic() at netbsd:vpanic+0x282 sys/kern/subr_prf.c:293
panic() at netbsd:panic+0x9e sys/kern/subr_prf.c:1043
kasan_report() at netbsd:kasan_report+0x8f kasan_code_name sys/kern/subr_asan.c:168 [inline]
kasan_report() at netbsd:kasan_report+0x8f sys/kern/subr_asan.c:200
__asan_load8() at netbsd:__asan_load8+0xac kasan_shadow_8byte_isvalid sys/kern/subr_asan.c:370 [inline]
__asan_load8() at netbsd:__asan_load8+0xac kasan_shadow_check sys/kern/subr_asan.c:420 [inline]
__asan_load8() at netbsd:__asan_load8+0xac sys/kern/subr_asan.c:1207
mount_domount() at netbsd:mount_domount+0x737 mount_checkdirs sys/kern/vfs_mount.c:678 [inline]
mount_domount() at netbsd:mount_domount+0x737 sys/kern/vfs_mount.c:824
do_sys_mount() at netbsd:do_sys_mount+0x758 sys/kern/vfs_syscalls.c:620
compat_40_sys_mount() at netbsd:compat_40_sys_mount+0xbd sys/compat/common/vfs_syscalls_40.c:88
sys___syscall() at netbsd:sys___syscall+0x10e sy_call sys/sys/syscallvar.h:65 [inline]
sys___syscall() at netbsd:sys___syscall+0x10e sys/kern/sys_syscall.c:90
syscall() at netbsd:syscall+0x25a sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x25a sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x25a sys/arch/x86/x86/syscall.c:138
--- syscall (number 21 via SYS_syscall) ---
netbsd:syscall+0x25a:
Panic string: ASan: Unauthorized Access In 0xffffffff81c87e17: Addr 0xffffa50013427700 [8 bytes, read, PoolUseAfterFree]

PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
10406 10406 2   0         0   ffffa5001343a4c0     syz-executor.2
7388  7388 2   0  10000000   ffffa50012cd6640     syz-executor.5
6974 >8005 7   0         0   ffffa50012b66540     syz-executor.0
6974  6974 2   0  10000000   ffffa500126ca780     syz-executor.0
7389  7389 3   1  10000000   ffffa5001341a300     syz-executor.4 tstile
26157 6863 2   1    100100   ffffa50012cf1b00     syz-executor.1
26157 26157 3   1  10000000   ffffa5001343a900     syz-executor.1 lwpwait
6451  6451 2   0       140   ffffa5001330c500     syz-executor.4
5559  5559 3   1        40   ffffa5001340bb40     syz-executor.5 tstile
18371 18371 2   0       140   ffffa50012c1cb40     syz-executor.0
26696 26696 2   0       140   ffffa500133725c0     syz-executor.2
10296 10296 2   0        40   ffffa5001339ca80     syz-executor.3
5050  5050 2   0       140   ffffa50013d446c0     syz-executor.1
1186   330 2   1       100   ffffa50012b66100       syz-execprog
1186  1202 3   1       180   ffffa50012b899c0       syz-execprog parked
1186  1200 2   0       140   ffffa50012b89580       syz-execprog
1186  1199 3   0       180   ffffa50012c0b6c0       syz-execprog parked
1186  1235 3   1       180   ffffa50012b89140       syz-execprog parked
1186  1380 3   0       180   ffffa50012b46500       syz-execprog parked
1186  1381 3   0       180   ffffa50012b460c0       syz-execprog kqueue
1186 >1239 7   1       140   ffffa50012aa0080       syz-execprog
1186  1186 3   0       180   ffffa50012bd1600       syz-execprog parked
1234  1234 3   1       180   ffffa50012bd1a40               sshd select
1126  1126 3   0       180   ffffa50013444500              getty nanoslp
1115  1115 3   0       180   ffffa500126cb040              getty nanoslp
699    699 3   0       180   ffffa500134739c0              getty nanoslp
1068  1068 3   0       1c0   ffffa50013473140              getty ttyraw
926    926 3   1       180   ffffa5001338d600               sshd select
953    953 3   0       180   ffffa50012cf16c0             powerd kqueue
689    689 3   0       180   ffffa500133c6b00            syslogd kqueue
602    602 3   0       180   ffffa50012bfeac0             dhcpcd poll
547    547 3   0       180   ffffa50012c82900             dhcpcd poll
464    464 3   0       180   ffffa50012bfe680             dhcpcd poll
587    587 3   0       180   ffffa50012c4e300             dhcpcd poll
289    289 3   0       180   ffffa50012d82080             dhcpcd poll
288    288 3   0       180   ffffa50012d6a8c0             dhcpcd poll
351    351 3   0       180   ffffa50012d6a480             dhcpcd poll
1        1 3   0       180   ffffa500128559c0               init wait
0      939 3   0       200   ffffa50012974ac0            physiod physiod
0      194 3   0       200   ffffa5001298bb00          pooldrain pooldrain
0      193 3   1       200   ffffa5001298b6c0            ioflush syncer
0      192 3   1       200   ffffa5001298b280           pgdaemon pgdaemon
0      169 3   0       200   ffffa50012974240               usb7 usbevt
0      167 3   0       200   ffffa5001292ea80               usb6 usbevt
0      165 3   0       200   ffffa5001292e640               usb5 usbevt
0      164 3   0       200   ffffa5001292e200               usb4 usbevt
0       31 3   0       200   ffffa500128e0a40               usb3 usbevt
0       63 3   0       200   ffffa500128e0600               usb2 usbevt
0      126 3   0       200   ffffa500128e01c0               usb1 usbevt
0      125 3   1       200   ffffa50012872a00               usb0 usbevt
0      124 3   1       200   ffffa500128725c0         usbtask-dr usbtsk
0      123 3   1       200   ffffa500120b66c0         usbtask-hc usbtsk
0      122 3   0       200   ffffa50012872180             npfgc0 npfgcw
0      121 3   1       200   ffffa50012855580            rt_free rt_free
0      120 3   1       200   ffffa50012855140              unpgc unpgc
0      119 2   0       200   ffffa500126f9980    key_timehandler
0      118 3   1       200   ffffa500126f9540    icmp6_wqinput/1 icmp6_wqinput
0      117 3   0       200   ffffa500126f9100    icmp6_wqinput/0 icmp6_wqinput
0      116 3   1       200   ffffa500126ee940          nd6_timer nd6_timer
0      115 3   1       200   ffffa500126ee500    carp6_wqinput/1 carp6_wqinput
0      114 3   0       200   ffffa500126ee0c0    carp6_wqinput/0 carp6_wqinput
0      113 3   1       200   ffffa500126df900     carp_wqinput/1 carp_wqinput
0      112 3   0       200   ffffa500126df4c0     carp_wqinput/0 carp_wqinput
0      111 3   1       200   ffffa500126df080     icmp_wqinput/1 icmp_wqinput
0      110 3   0       200   ffffa500126cb8c0     icmp_wqinput/0 icmp_wqinput
0      109 2   0       200   ffffa500126cabc0           rt_timer
0      108 3   0       200   ffffa500126cb480        vmem_rehash vmem_rehash
0       99 3   1       200   ffffa500120bbb40          entbutler entropy
0       98 3   0       200   ffffa500120bb700              viomb balloon
0       97 3   1       200   ffffa500120bb2c0      vioif0_txrx/1 vioif0_txrx
0       96 3   0       200   ffffa500120b6b00      vioif0_txrx/0 vioif0_txrx
0       29 3   0       200   ffffa500120b6280           scsibus0 sccomp
0       28 3   0       200   ffffa50010cbaac0               pms0 pmsreset
0       27 3   1       200   ffffa50010cba680            xcall/1 xcall
0       26 1   1       200   ffffa50010cba240          softser/1
0       25 1   1       200   ffffa50010cb9a80          softclk/1
0       24 1   1       200   ffffa50010cb9640          softbio/1
0       23 1   1       200   ffffa50010cb9200          softnet/1
0       22 1   1       201   ffffa5000fb55a40             idle/1
0       21 3   0       200   ffffa5000fb55600           lnxsyswq lnxsyswq
0       20 3   0       200   ffffa5000fb551c0           lnxubdwq lnxubdwq
0       19 3   0       200   ffffa5000fb54a00           lnxpwrwq lnxpwrwq
0       18 3   0       200   ffffa5000fb545c0           lnxlngwq lnxlngwq
0       17 3   0       200   ffffa5000fb54180           lnxhipwq lnxhipwq
0       16 3   0       200   ffffa5000fb4b9c0           lnxrcugc lnxrcugc
0       15 3   0       200   ffffa5000fb4b580             sysmon smtaskq
0       14 3   0       200   ffffa5000fb4b140         pmfsuspend pmfsuspend
0       13 3   0       200   ffffa5000fb48980           pmfevent pmfevent
0       12 3   0       200   ffffa5000fb48540         sopendfree sopendfr
0       11 3   0       200   ffffa5000fb48100            iflnkst iflnkst
0       10 3   0       200   ffffa5000fb3c940           nfssilly nfssilly
0        9 3   0       240   ffffa5000fb3c500             vdrain vdrain
0        8 3   1       200   ffffa5000fb3c0c0          modunload mod_unld
0        7 3   0       200   ffffa5000fb33900            xcall/0 xcall
0        6 1   0       200   ffffa5000fb334c0          softser/0
0        5 1   0       200   ffffa5000fb33080          softclk/0
0        4 1   0       200   ffffa5000fb318c0          softbio/0
0        3 1   0       200   ffffa5000fb31480          softnet/0
0        2 1   0       201   ffffa5000fb31040             idle/0
0        0 3   1       240   ffffffff83341240            swapper tstile
[Locks tracked through LWPs]

****** LWP 10406.10406 (syz-executor.2) @ 0xffffa5001343a4c0, l_stat=2

*** Locks held:

* Lock 0 (initialized at pmap_ctor)
lock address : 0xffffa50012d07180 type     :     sleep/adaptive
initialized  : 0xffffffff80950139
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa5001343a4c0 last held: 0xffffa5001343a4c0
last locked* : 0xffffffff80951f6c unlocked : 0xffffffff80950001
owner field  : 0xffffa5001343a4c0 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 7388.7388 (syz-executor.5) @ 0xffffa50012cd6640, l_stat=2

*** Locks held:

* Lock 0 (initialized at fork1)
lock address : 0xffffa50012a93410 type     :     sleep/adaptive
initialized  : 0xffffffff81af2cfb
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa50012cd6640 last held: 0xffffa50012cd6640
last locked* : 0xffffffff81aeef7b unlocked : 000000000000000000
owner/count  : 0xffffa50012cd6640 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

* Lock 1 (initialized at vcache_alloc)
lock address : 0xffffa50014395a40 type     :     sleep/adaptive
initialized  : 0xffffffff81ca6710
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa50012cd6640 last held: 0xffffa50012cd6640
last locked* : 0xffffffff81cdc650 unlocked : 0xffffffff81cdc6e8
owner/count  : 0xffffa50012cd6640 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

*** Locks wanted:

* Lock 0 (initialized at bufinit)
lock address : 0xffffffff83489dc0 type     :     sleep/adaptive
initialized  : 0xffffffff81c66fac
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  1
relevant cpu :                  0 last held:                  1
relevant lwp : 0xffffa50012cd6640 last held: 000000000000000000
last locked  : 0xffffffff81c699c7 unlocked*: 0xffffffff81c699dd
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 6974.8005 (syz-executor.0) @ 0xffffa50012b66540, l_stat=7

*** Locks held:

* Lock 0 (initialized at vfs_mountalloc)
lock address : 0xffffa5001437c140 type     :     sleep/adaptive
initialized  : 0xffffffff81c84322
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa50012b66540 last held: 0xffffa50012b66540
last locked* : 0xffffffff81c878c2 unlocked : 000000000000000000
owner field  : 0xffffa50012b66540 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

* Lock 1 (initialized at vcache_alloc)
lock address : 0xffffa500142df980 type     :     sleep/adaptive
initialized  : 0xffffffff81ca6710
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa50012b66540 last held: 0xffffa50012b66540
last locked* : 0xffffffff81cdc686 unlocked : 0xffffffff81cdc6e8
owner/count  : 0xffffa50012b66540 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

* Lock 2 (initialized at procinit)
lock address : 0xffffffff83480040 type     :     sleep/adaptive
initialized  : 0xffffffff81b204e2
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa50012b66540 last held: 0xffffa50012b66540
last locked* : 0xffffffff81c87d90 unlocked : 0xffffffff81b07fa0
owner field  : 0xffffa50012b66540 wait/spin:                1/0
Turnstile:
=> 0 waiting readers:
=> 3 waiting writers: 0xffffffff83341240 0xffffa5001340bb40 0xffffa5001341a300

*** Locks wanted: none

****** LWP 7389.7389 (syz-executor.4) @ 0xffffa5001341a300, l_stat=3

*** Locks held:

* Lock 0 (initialized at fork1)
lock address : 0xffffa50012a433d0 type     :     sleep/adaptive
initialized  : 0xffffffff81af2cfb
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffffa5001341a300 last held: 0xffffa5001341a300
last locked* : 0xffffffff81aeef7b unlocked : 000000000000000000
owner/count  : 0xffffa5001341a300 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

* Lock 1 (initialized at amap_ctor)
lock address : 0xffffa50014114cc0 type     :     sleep/adaptive
initialized  : 0xffffffff81a50b1b
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffffa5001341a300 last held: 0xffffa5001341a300
last locked* : 0xffffffff81a55ff2 unlocked : 0xffffffff81a5f096
owner/count  : 000000000000000000 flags    : 000000000000000000
Turnstile: no active turnstile for this lock.

*** Locks wanted:

* Lock 0 (initialized at pool_init)
lock address : 0xffffffff834f9df0 type     :     sleep/adaptive
initialized  : 0xffffffff81bbc4c2
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  1
relevant cpu :                  1 last held:                  0
relevant lwp : 0xffffa5001341a300 last held: 000000000000000000
last locked  : 0xffffffff81bbf2fd unlocked*: 0xffffffff81bbf413
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 547.547 (dhcpcd) @ 0xffffa50012c82900, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347ff40 type     :     sleep/adaptive
initialized  : 0xffffffff81b12021
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa50012c82900 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 464.464 (dhcpcd) @ 0xffffa50012bfe680, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347ff40 type     :     sleep/adaptive
initialized  : 0xffffffff81b12021
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa50012bfe680 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 288.288 (dhcpcd) @ 0xffffa50012d6a8c0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347ff40 type     :     sleep/adaptive
initialized  : 0xffffffff81b12021
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa50012d6a8c0 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 351.351 (dhcpcd) @ 0xffffa50012d6a480, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347ff40 type     :     sleep/adaptive
initialized  : 0xffffffff81b12021
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa50012d6a480 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.11 (iflnkst) @ 0xffffa5000fb48100, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347ff40 type     :     sleep/adaptive
initialized  : 0xffffffff81b12021
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa5000fb48100 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.5 (softclk/0) @ 0xffffa5000fb33080, l_stat=1

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347ff40 type     :     sleep/adaptive
initialized  : 0xffffffff81b12021
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa5000fb33080 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.0 (swapper) @ 0xffffffff83341240, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff8347ff40 type     :     sleep/adaptive
initialized  : 0xffffffff81b12021
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  0
relevant lwp : 0xffffffff83341240 last held: 000000000000000000
last locked  : 000000000000000000 unlocked*: 000000000000000000
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

[Locks tracked through CPUs]

******* Locks held on cpu0:

* Lock 0 (initialized at kprintf_init)
lock address : 0xffffffff8358aea0 type     :               spin
initialized  : 0xffffffff81bc4235
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffa50012b66540 last held: 0xffffa50012b66540
last locked* : 0xffffffff81bc42a6 unlocked : 0xffffffff81bc4304
owner field  : 0x0000000000000800 wait/spin:                0/1

              PAGE FLAG   PQ            UOBJECT              UANON
0xffffa50000017180 0041 00000000                0x0                0x0
0xffffa50000017200 0041 00000000                0x0                0x0
0xffffa50000017280 0041 00000000                0x0                0x0
0xffffa50000017300 0041 00000000                0x0                0x0
0xffffa50000017380 0041 00000000                0x0                0x0
0xffffa50000017400 0041 00000000                0x0                0x0
0xffffa50000017480 0041 00000000                0x0                0x0
0xffffa50000017500 0041 00000000                0x0                0x0
0xffffa50000017580 0041 00000000                0x0                0x0
0xffffa50000017600 0041 00000000                0x0                0x0
0xffffa50000017680 0041 00000000                0x0                0x0
0xffffa50000017700 0041 00000000                0x0                0x0
0xffffa50000017780 0041 00000000                0x0                0x0
0xffffa50000017800 0041 00000000                0x0                0x0
0xffffa50000017880 0041 00000000                0x0                0x0
0xffffa50000017900 0041 00000000                0x0                0x0
0xffffa50000017980 0041 00000000                0x0                0x0
0xffffa50000017a00 0041 00000000                0x0                0x0
0xffffa50000017a80 0041 00000000                0x0                0x0
0xffffa50000017b00 0041 00000000                0x0                0x0
0xffffa50000017b80 0041 00000000                0x0                0x0
0xffffa50000017c00 0041 00000000                0x0                0x0
0xffffa50000017c80 0041 00000000                0x0                0x0
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0xffffa50000024700 0001 00000000                0x0                0x0
0xffffa50000024780 0001 00000000                0x0                0x0
0xffffa50000024800 0001 00000000                0x0                0x0
0xffffa50000024880 0001 00000000                0x0                0x0
0xffffa50000024900 0001 00000000                0x0                0x0
0xffffa50000024980 0001 00000000                0x0                0x0
0xffffa50000024a00 0001 00000000                0x0                0x0
0xffffa50000024a80 0001 00000000                0x0                0x0
0xffffa50000024b00 0001 00000000                0x0                0x0
0xffffa50000024b80 0001 00000000                0x0                0x0
0xffffa50000024c00 0001 00000000                0x0                0x0
0xffffa50000024c80 0001 00000000                0x0                0x0
0xffffa50000024d00 0001 00000000                0x0                0x0
0xffffa50000024d80 0001 00000000                0x0                0x0
0xffffa50000024e00 0001 00000000                0x0                0x0
0xffffa50000024e80 0001 00000000                0x0                0x0
0xffffa50000024f00 0001 00000000                0x0                0x0
0xffffa50000024f80 0001 00000000                0x0                0x0
0xffffa50000025000 0001 00000000                0x0                0x0
0xffffa50000025080 0001 00000000                0x0                0x0
0xffffa50000025100 0001 00000000                0x0                0x0
0xffffa50000025180 0001 00000000                0x0                0x0
0xffffa50000025200 0001 00000000                0x0                0x0
0xffffa50000025280 0001 00000000                0x0                0x0
0xffffa50000025300 0001 00000000                0x0                0x0
0xffffa50000025380 0001 00000000                0x0                0x0
0xffffa50000025400 0001 00000000                0x0                0x0
0xffffa50000025480 0001 00000000                0x0                0x0
0xffffa50000025500 0001 00000000                0x0                0x0
0xffffa50000025580 0001 00000000                0x0                0x0
0xffffa50000025600 0001 00000000                0x0                0x0
0xffffa50000025680 0001 00000000                0x0                0x0
0xffffa50000025700 0001 00000000                0x0                0x0
0xffffa50000025780 0001 00000000                0x0                0x0
0xffffa50000025800 0001 00000000                0x0                0x0
0xffffa50000025880 0001 00000000                0x0                0x0
0xffffa50000025900 0001 00000000                0x0                0x0
0xffffa50000025980 0001 00000000                0x0                0x0
0xffffa50000025a00 0001 00000000                0x0                0x0
0xffffa50000025a80 0001 00000000                0x0                0x0
0xffffa50000025b00 0001 00000000                0x0                0x0
0xffffa50000025b80 0001 00000000                0x0                0x0
0xffffa50000025c00 0001 00000000                0x0                0x0
0xffffa50000025c80 0001 00000000                0x0                0x0
0xffffa50000025d00 0001 00000000                0x0                0x0
0xffffa50000025d80 0001 00000000                0x0                0x0
0xffffa50000025e00 0001 00000000                0x0                0x0
0xffffa50000025e80 0001 00000000                0x0                0x0
0xffffa50000025f00 0001 00000000                0x0                0x0
0xffffa50000025f80 0001 00000000                0x0                0x0
0xffffa50000026000 0001 00000000                0x0                0x0
0xffffa50000026080 0001 00000000                0x0                0x0
0xffffa50000026100 0001 00000000                0x0                0x0
0xffffa50000026180 0001 00000000                0x0                0x0
0xffffa50000026200 0001 00000000                0x0                0x0
0xffffa50000026280 0001 00000000                0x0                0x0
0xffffa50000026300 0001 00000000                0x0                0x0
0xffffa50000026380 0001 00000000                0x0                0x0
0xffffa50000026400 0001 00000000                0x0                0x0
0xffffa50000026480 0001 00000000                0x0                0x0
0xffffa50000026500 0001 00000000                0x0                0x0
0xffffa50000026580 0001 00000000                0x0                0x0
0xffffa50000026600 0001 00000000                0x0                0x0
0xffffa50000026680 0001 00000000                0x0                0x0
0xffffa50000026700 0001 00000000                0x0                0x0
0xffffa50000026780 0001 00000000                0x0                0x0
0xffffa50000026800 0001 00000000                0x0                0x0
0xffffa50000026880 0001 00000000                0x0                0x0
0xffffa50000026900 0001 00000000                0x0                0x0
0xffffa50000026980 0001 00000000                0x0                0x0
0xffffa50000026a00 0001 00000000                0x0                0x0
0xffffa50000026a80 0001 00000000                0x0                0x0
0xffffa50000026b00 0001 00000000                0x0                0x0
0xffffa50000026b80 0001 00000000                0x0                0x0
0xffffa50000026c00 0001 00000000                0x0                0x0
0xffffa50000026c80 0001 00000000                0x0                0x0
0xffffa50000026d00 0001 00000000                0x0                0x0
0xffffa50000026d80 0001 00000000                0x0                0x0
0xffffa50000026e00 0001 00000000                0x0                0x0
0xffffa50000026e80 0001 00000000                0x0                0x0
0xffffa50000026f00 0001 00000000                0x0                0x0
0xffffa50000026f80 0001 00000000                0x0                0x0
0xffffa50000027000 0001 00000000                0x0                0x0
0xffffa50000027080 0001 00000000                0x0                0x0
0xffffa50000027100 0001 00000000                0x0                0x0
0xffffa50000027180 0001 00000000                0x0                0x0
0xffffa50000027200 0001 00000000                0x0                0x0
0xffffa50000027280 0001 00000000                0x0                0x0
0xffffa50000027300 0001 00000000                0x0                0x0
0xffffa50000027380 0001 00000000                0x0                0x0
0xffffa50000027400 0001 00000000                0x0                0x0
0xffffa50000027480 0001 00000000                0x0                0x0
0xffffa50000027500 0001 00000000                0x0                0x0
0xffffa50000027580 0001 00000000                0x0                0x0
0xffffa50000027600 0001 00000000                0x0                0x0
0xffffa50000027680 0001 00000000                0x0                0x0
0xffffa50000027700 0001 00000000                0x0                0x0
0xffffa50000027780 0001 00000000                0x0                0x0
0xffffa50000027800 0001 00000000                0x0                0x0
0xffffa50000027880 0001 00000000                0x0                0x0
0xffffa50000027900 0001 00000000                0x0                0x0
0xffffa50000027980 0001 00000000                0x0                0x0
0xffffa50000027a00 0001 00000000                0x0                0x0
0xffffa50000027a80 0001 00000000                0x0                0x0
0xffffa50000027b00 0001 00000000                0x0                0x0
0xffffa50000027b80 0001 00000000                0x0                0x0
0xffffa50000027c00 0001 00000000                0x0                0x0
0xffffa50000027c80 0001 00000000                0x0                0x0
0xffffa50000027d00 0001 00000000                0x0                0x0
0xffffa50000027d80 0001 00000000                0x0                0x0
0xffffa50000027e00 0001 00000000                0x0                0x0
0xffffa50000027e80 0001 00000000                0x0                0x0
0xffffa50000027f00 0001 00000000                0x0                0x0
0xffffa50000027f80 0001 00000000                0x0                0x0
0xffffa50000028000 0001 00000000                0x0                0x0
0xffffa50000028080 0001 00000000                0x0                0x0
0xffffa50000028100 0001 00000000                0x0                0x0
0xffffa50000028180 0001 00000000                0x0                0x0
0xffffa50000028200 0001 00000000                0x0                0x0
0xffffa50000028280 0001 00000000                0x0                0x0
0xffffa50000028300 0001 00000000                0x0                0x0
0xffffa50000028380 0001 00000000                0x0                0x0
0xffffa50000028400 0001 00000000                0x0                0x0
0xffffa50000028480 0001 00000000                0x0                0x0
0xffffa50000028500 0001 00000000                0x0                0x0
0xffffa50000028580 0001 00000000                0x0                0x0
0xffffa50000028600 0001 00000000                0x0                0x0
0xffffa50000028680 0001 00000000                0x0                0x0
0xffffa50000028700 0001 00000000                0x0                0x0
0xffffa50000028780 0001 00000000                0x0                0x0
0xffffa50000028800 0001 00000000                0x0                0x0
0xffffa50000028880 0001 00000000                0x0                0x0
0xffffa50000028900 0001 00000000                0x0                0x0
0xffffa50000028980 0001 00000000                0x0                0x0
0xffffa50000028a00 0001 00000000                0x0                0x0
0xffffa50000028a80 0001 00000000                0x0                0x0
0xffffa50000028b00 0001 00000000                0x0                0x0
0xffffa50000028b80 0001 00000000                0x0                0x0
0xffffa50000028c00 0001 00000000                0x0                0x0
0xffffa50000028c80 0001 00000000                0x0                0x0
0xffffa50000028d00 0001 00000000                0x0                0x0
0xffffa50000028d80 0001 00000000                0x0                0x0
0xffffa50000028e00 0001 00000000                0x0                0x0
0xffffa50000028e80 0001 00000000                0x0                0x0
0xffffa50000028f00 0001 00000000                0x0                0x0
0xffffa50000028f80 0001 00000000                0x0                0x0
0xffffa50000029000 0001 00000000                0x0                0x0
0xffffa50000029080 0001 00000000                0x0                0x0
0xffffa50000029100 0001 00000000                0x0                0x0
0xffffa50000029180 0001 00000000                0x0                0x0
0xffffa50000029200 0001 00000000                0x0                0x0
0xffffa50000029280 0001 00000000                0x0                0x0
0xffffa50000029300 0001 00000000                0x0                0x0
0xffffa50000029380 0001 00000000                0x0                0x0
0xffffa50000029400 0001 00000000                0x0                0x0
0xffffa50000029480 0001 00000000                0x0                0x0
0xffffa50000029500 0001 00000000                0x0                0x0
0xffffa50000029580 0001 00000000                0x0                0x0
0xffffa50000029600 0001 00000000                0x0                0x0
0xffffa50000029680 0001 00000000                0x0                0x0
0xffffa50000029700 0001 00000000                0x0                0x0
0xffffa50000029780 0001 00000000                0x0                0x0
0xffffa50000029800 0001 00000000                0x0                0x0
0xffffa50000029880 0001 00000000                0x0                0x0
0xffffa50000029900 0001 00000000                0x0                0x0
0xffffa50000029980 0001 00000000                0x0                0x0
0xffffa50000029a00 0001 00000000                0x0                0x0
0xffffa50000029a80 0001 00000000                0x0                0x0
0xffffa50000029b00 0001 00000000                0x0                0x0
0xffffa50000029b80 0001 00000000                0x0                0x0
0xffffa50000029c00 0001 00000000                0x0                0x0
0xffffa50000029c80 0001 00000000                0x0                0x0
0xffffa50000029d00 0001 00000000                0x0                0x0
0xffffa50000029d80 0001 00000000                0x0                0x0
0xffffa50000029e00 0001 00000000                0x0                0x0
0xffffa50000029e80 0001 00000000                0x0                0x0
0xffffa50000029f00 0001 00000000                0x0                0x0
0xffffa50000029f80 0001 00000000                0x0                0x0
0xffffa5000002a000 0001 00000000                0x0                0x0
0xffffa5000002a080 0001 00000000                0x0                0x0
0xffffa5000002a100 0001 00000000    

Tested on:

commit:         b9a4870f route(4): Avoid unaligned access to struct rt..
git tree:       https://github.com/NetBSD/src trunk
console output: https://syzkaller.appspot.com/x/log.txt?x=17376138080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fab579639ba4bf0a
dashboard link: https://syzkaller.appspot.com/bug?extid=f8bab6e5f08bae7b5c83
compiler:       g++ (Debian 10.2.1-6) 10.2.1 20210110
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1338af9c080000

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