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Re: assert failed: c->c_magic == CALLOUT_MAGIC (2)



Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
UBSan: Undefined Behavior in ktrace_common

[  44.5367227] panic: UBSan: Undefined Behavior in /syzkaller/jobs/netbsd/kernel/sys/kern/kern_ktrace.c:1044:29, member access within null pointer of type 'struct ktr_desc'

[  44.5467153] cpu1: Begin traceback...
[  44.5667143] vpanic() at netbsd:vpanic+0x2f2 sys/kern/subr_prf.c:293
[  44.6367103] Report() at netbsd:Report+0x3b sys/../common/lib/libc/misc/ubsan.c:1352
[  44.6967116] HandleTypeMismatch() at netbsd:HandleTypeMismatch+0x1fb sys/../common/lib/libc/misc/ubsan.c:429
[  44.7467103] ktrace_common() at netbsd:ktrace_common+0x623 sys/kern/kern_ktrace.c:1044
[  44.7967124] sys_fktrace() at netbsd:sys_fktrace+0xd6 sys/kern/kern_ktrace.c:1186
[  44.8467113] sys___syscall() at netbsd:sys___syscall+0x1e4 sy_call sys/sys/syscallvar.h:65 [inline]
[  44.8467113] sys___syscall() at netbsd:sys___syscall+0x1e4 sys/kern/sys_syscall.c:90
[  44.8967129] syscall() at netbsd:syscall+0x2da sy_call sys/sys/syscallvar.h:65 [inline]
[  44.8967129] syscall() at netbsd:syscall+0x2da sy_invoke sys/sys/syscallvar.h:94 [inline]
[  44.8967129] syscall() at netbsd:syscall+0x2da sys/arch/x86/x86/syscall.c:138
[  44.9167102] --- syscall (number 288 via SYS_syscall) ---
[  44.9367092] netbsd:syscall+0x2da:
[  44.9367092] cpu1: End traceback...
[  44.9367092] fatal breakpoint trap in supervisor mode
[  44.9467085] trap type 1 code 0 rip 0xffffffff80221ab5 cs 0x8 rflags 0x246 cr2 0x63e060 ilevel 0 rsp 0xffffcf024803b920
[  44.9567071] curlwp 0xfffffe4d9adc6540 pid 1211.1207 lowest kstack 0xffffcf02480372c0
Stopped in pid 1211.1207 (syz-executor.3) at    netbsd:breakpoint+0x5:  leave
?
breakpoint() at netbsd:breakpoint+0x5
db_panic() at netbsd:db_panic+0xec sys/ddb/db_panic.c:69
vpanic() at netbsd:vpanic+0x2f2 sys/kern/subr_prf.c:293
Report() at netbsd:Report+0x3b sys/../common/lib/libc/misc/ubsan.c:1352
HandleTypeMismatch() at netbsd:HandleTypeMismatch+0x1fb sys/../common/lib/libc/misc/ubsan.c:429
ktrace_common() at netbsd:ktrace_common+0x623 sys/kern/kern_ktrace.c:1044
sys_fktrace() at netbsd:sys_fktrace+0xd6 sys/kern/kern_ktrace.c:1186
sys___syscall() at netbsd:sys___syscall+0x1e4 sy_call sys/sys/syscallvar.h:65 [inline]
sys___syscall() at netbsd:sys___syscall+0x1e4 sys/kern/sys_syscall.c:90
syscall() at netbsd:syscall+0x2da sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x2da sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x2da sys/arch/x86/x86/syscall.c:138
--- syscall (number 288 via SYS_syscall) ---
netbsd:syscall+0x2da:
Panic string: UBSan: Undefined Behavior in /syzkaller/jobs/netbsd/kernel/sys/kern/kern_ktrace.c:1044:29, member access within null pointer of type 'struct ktr_desc'

PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
1236  1236 2   0         0   fffffe4d998ea340     syz-executor.0
1245  1322 2   0         0   fffffe4d9a27c0c0     syz-executor.4
1245 >1245 7   0  10000000   fffffe4d90ce0740     syz-executor.4
1210  1210 2   0         0   fffffe4d9db53680     syz-executor.5
1312  1312 2   0         0   fffffe4d9db53240     syz-executor.1
1211 >1207 7   1       100   fffffe4d9adc6540     syz-executor.3
1211  1211 2   1  10000000   fffffe4d9c066a80     syz-executor.3
324    324 2   1         0   fffffe4d9a0c4480     syz-executor.2
335    335 2   0         0   fffffe4d9c066640     syz-executor.0
331    331 2   0     40100   fffffe4d9b807600     syz-executor.4
330    330 2   1     40140   fffffe4d9938b6c0     syz-executor.3
1198  1352 3   0       180   fffffe4d9a0c4040       syz-execprog parked
1198   976 3   0       180   fffffe4d9a27c500       syz-execprog kqueue
1198  1213 3   1       180   fffffe4d9a27c940       syz-execprog wait
1198  1384 3   1       180   fffffe4d9adc6100       syz-execprog wait
1198   953 3   0       180   fffffe4d99004640       syz-execprog wait
1198  1238 3   1       180   fffffe4d9938b280       syz-execprog wait
1198  1202 3   1       180   fffffe4d9b807a40       syz-execprog parked
1198  1204 3   0       180   fffffe4d9b8071c0       syz-execprog parked
1198  1199 3   1       180   fffffe4d995072c0       syz-execprog wait
1198  1197 3   1       1c0   fffffe4d9b5e35c0       syz-execprog wait
1198  1203 2   0       100   fffffe4d9938bb00       syz-execprog
1198  1198 3   1     40180   fffffe4d9c066200       syz-execprog parked
1241  1241 3   1       180   fffffe4d9b5e3a00               sshd select
1195  1195 3   0       180   fffffe4d9b5e3180              getty nanoslp
732    732 3   0       180   fffffe4d9b209580              getty nanoslp
1086  1086 3   0       180   fffffe4d9adc6980              getty nanoslp
945    945 3   1       1c0   fffffe4d9907eac0              getty ttyraw
1100  1100 3   1       180   fffffe4d9b209140               sshd select
1023  1023 3   0       180   fffffe4d9b2099c0             powerd kqueue
693    693 3   0       180   fffffe4d9aa50900            syslogd kqueue
547    547 3   0       180   fffffe4d99787b80             dhcpcd poll
742    742 3   0       180   fffffe4d99507b40             dhcpcd poll
465    465 3   0       180   fffffe4d998eabc0             dhcpcd poll
594    594 3   0       180   fffffe4d99507700             dhcpcd poll
292    292 3   0       180   fffffe4d99787740             dhcpcd poll
290    290 3   0       180   fffffe4d99787300             dhcpcd poll
289    289 3   0       180   fffffe4d998ea780             dhcpcd poll
1        1 3   0       180   fffffe4d90e5b980               init wait
0      940 3   0       200   fffffe4d99004a80            physiod physiod
0      195 3   0       200   fffffe4d9907e680            ioflush syncer
0      194 3   0       200   fffffe4d90ce0b80          pooldrain pooldrain
0      193 3   1       200   fffffe4d9907e240           pgdaemon pgdaemon
0      169 3   1       200   fffffe4d99004200               usb7 usbevt
0      168 3   1       200   fffffe4d95f7fa40               usb6 usbevt
0      167 3   1       200   fffffe4d95f7f600               usb5 usbevt
0      166 3   1       200   fffffe4d95f7f1c0               usb4 usbevt
0      165 3   1       200   fffffe4d92f1aa00               usb3 usbevt
0       31 3   1       200   fffffe4d92f1a5c0               usb2 usbevt
0       63 3   1       200   fffffe4d92f1a180               usb1 usbevt
0      126 3   1       200   fffffe4d91ef49c0               usb0 usbevt
0      125 3   1       200   fffffe4d91ef4580         usbtask-dr usbtsk
0      124 3   1       200   fffffe4d91ef4140         usbtask-hc usbtsk
0      123 3   0       200   fffffe4d8f2a9b00             npfgc0 npfgcw
0      122 3   1       200   fffffe4d90e5b540            rt_free rt_free
0      121 3   1       200   fffffe4d90e5b100              unpgc unpgc
0      120 3   0       200   fffffe4d90e46940    key_timehandler key_timehandler
0      119 3   1       200   fffffe4d90e46500    icmp6_wqinput/1 icmp6_wqinput
0      118 3   0       200   fffffe4d90e460c0    icmp6_wqinput/0 icmp6_wqinput
0      117 3   0       200   fffffe4d90e39900          nd6_timer nd6_timer
0      116 3   1       200   fffffe4d90e394c0    carp6_wqinput/1 carp6_wqinput
0      115 3   0       200   fffffe4d90e39080    carp6_wqinput/0 carp6_wqinput
0      114 3   1       200   fffffe4d90e148c0     carp_wqinput/1 carp_wqinput
0      113 3   0       200   fffffe4d90e14480     carp_wqinput/0 carp_wqinput
0      112 3   1       200   fffffe4d90e14040     icmp_wqinput/1 icmp_wqinput
0      111 3   0       200   fffffe4d90dd7bc0     icmp_wqinput/0 icmp_wqinput
0      110 3   0       200   fffffe4d90dd7340           rt_timer rt_timer
0      109 3   0       200   fffffe4d90dd7780        vmem_rehash vmem_rehash
0      100 3   0       200   fffffe4d90ce0300          entbutler entropy
0       99 3   1       200   fffffe4d90748b40              viomb balloon
0       98 3   1       200   fffffe4d90748700      vioif0_txrx/1 vioif0_txrx
0       97 3   0       200   fffffe4d907482c0      vioif0_txrx/0 vioif0_txrx
0       30 3   1       200   fffffe4d8f2a96c0           scsibus0 sccomp
0       29 3   0       200   fffffe4d8f2a9280               pms0 pmsreset
0       28 3   1       200   fffffe4d8f1acac0            xcall/1 xcall
0       27 1   1       200   fffffe4d8f1ac680          softser/1
0       26 1   1       200   fffffe4d8f1ac240          softclk/1
0       25 1   1       200   fffffe4d8f187a80          softbio/1
0       24 1   1       200   fffffe4d8f187640          softnet/1
0       23 1   1       201   fffffe4d8f187200             idle/1
0       22 3   1       200   fffffe4ebd52da40           lnxsyswq lnxsyswq
0       21 3   1       200   fffffe4ebd52d600           lnxubdwq lnxubdwq
0       20 3   0       200   fffffe4ebd52d1c0           lnxpwrwq lnxpwrwq
0       19 3   1       200   fffffe4ebd534a00           lnxlngwq lnxlngwq
0       18 3   1       200   fffffe4ebd5345c0           lnxhipwq lnxhipwq
0       17 3   1       200   fffffe4ebd534180           lnxrcugc lnxrcugc
0       16 3   0       200   fffffe4ebd5539c0             sysmon smtaskq
0       15 3   1       200   fffffe4ebd553580         pmfsuspend pmfsuspend
0       14 3   0       200   fffffe4ebd553140           pmfevent pmfevent
0       13 3   1       200   fffffe4ebd55e980         sopendfree sopendfr
0       12 3   0       200   fffffe4ebd55e540             ifwdog ifwdog
0       11 3   1       200   fffffe4ebd55e100            iflnkst iflnkst
0       10 3   1       200   fffffe4ebe595940           nfssilly nfssilly
0        9 3   0       200   fffffe4ebe595500             vdrain vdrain
0        8 3   1       200   fffffe4ebe5950c0          modunload mod_unld
0        7 3   0       200   fffffe4ebe5ba900            xcall/0 xcall
0        6 1   0       200   fffffe4ebe5ba4c0          softser/0
0        5 1   0       200   fffffe4ebe5ba080          softclk/0
0        4 1   0       200   fffffe4ebe5eb8c0          softbio/0
0        3 1   0       200   fffffe4ebe5eb480          softnet/0
0        2 1   0       201   fffffe4ebe5eb040             idle/0
0        0 3   0       200   ffffffff86740cc0            swapper uvm
[Locks tracked through LWPs]

****** LWP 1210.1210 (syz-executor.5) @ 0xfffffe4d9db53680, l_stat=2

*** Locks held:

* Lock 0 (initialized at netbsd:amap_alloc1+0x30a sys/uvm/uvm_amap.c:167)
lock address : fffffe4d9ca313c0
type         : sleep/adaptive
initialized  : netbsd:amap_alloc1+0x30a
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xfffffe4d9db53680 last held: 0xfffffe4d9db53680
last locked* : netbsd:uvm_fault_internal+0x75d
unlocked     : netbsd:uvm_fault_lower_enter+0x86d
owner/count  : 000000000000000000 flags    : 000000000000000000
Turnstile: no active turnstile for this lock.

* Lock 1 (initialized at netbsd:pmap_ctor+0x6d sys/arch/x86/x86/pmap.c:2857)
lock address : fffffe4d9942e780
type         : sleep/adaptive
initialized  : netbsd:pmap_ctor+0x6d
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xfffffe4d9db53680 last held: 0xfffffe4d9db53680
last locked* : netbsd:pmap_extract+0xdb
unlocked     : netbsd:pmap_enter_ma+0xa7d
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 1312.1312 (syz-executor.1) @ 0xfffffe4d9db53240, l_stat=2

*** Locks held:

* Lock 0 (initialized at netbsd:uvmspace_alloc+0x339 uvm_map_setup sys/uvm/uvm_map.c:4772 [inline])
* Lock 0 (initialized at netbsd:uvmspace_alloc+0x339 uvmspace_init sys/uvm/uvm_map.c:4115 [inline])
* Lock 0 (initialized at netbsd:uvmspace_alloc+0x339 sys/uvm/uvm_map.c:4094)
lock address : fffffe4d90e7eb40
type         : sleep/adaptive
initialized  : netbsd:uvmspace_alloc+0x339
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xfffffe4d9db53240 last held: 0xfffffe4d9db53240
last locked* : netbsd:uvm_map_prepare+0x11e
unlocked     : netbsd:uvm_map_enter+0x791
owner/count  : 000000000000000000 flags    : 000000000000000000
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 324.324 (syz-executor.2) @ 0xfffffe4d9a0c4480, l_stat=2

*** Locks held:

* Lock 0 (initialized at netbsd:vcache_alloc+0xba sys/kern/vfs_vnode.c:1392)
lock address : fffffe4d9dbfe9c0
type         : sleep/adaptive
initialized  : netbsd:vcache_alloc+0xba
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xfffffe4d9a0c4480 last held: 0xfffffe4d9a0c4480
last locked* : netbsd:genfs_lock+0x220
unlocked     : netbsd:genfs_unlock+0x50
owner/count  : 0xfffffe4d9a0c4480 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

* Lock 1 (initialized at netbsd:vcache_alloc+0xba sys/kern/vfs_vnode.c:1392)
lock address : fffffe4d9dbfeec0
type         : sleep/adaptive
initialized  : netbsd:vcache_alloc+0xba
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xfffffe4d9a0c4480 last held: 0xfffffe4d9a0c4480
last locked* : netbsd:genfs_lock+0x220
unlocked     : 0
owner/count  : 0xfffffe4d9a0c4480 flags    : 0x0000000000000004
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 335.335 (syz-executor.0) @ 0xfffffe4d9c066640, l_stat=2

*** Locks held:

* Lock 0 (initialized at netbsd:vcache_alloc+0xba sys/kern/vfs_vnode.c:1392)
lock address : fffffe4d9c42cc00
type         : sleep/adaptive
initialized  : netbsd:vcache_alloc+0xba
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  1
relevant lwp : 0xfffffe4d9c066640 last held: 0xfffffe4d9c066640
last locked* : netbsd:genfs_lock+0x220
unlocked     : netbsd:genfs_unlock+0x50
owner/count  : 000000000000000000 flags    : 000000000000000000
Turnstile: no active turnstile for this lock.

* Lock 1 (initialized at netbsd:vcache_alloc+0xba sys/kern/vfs_vnode.c:1392)
lock address : fffffe4d9dbfec40
type         : sleep/adaptive
initialized  : netbsd:vcache_alloc+0xba
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xfffffe4d9c066640 last held: 0xfffffe4d9c066640
last locked* : netbsd:genfs_lock+0x220
unlocked     : 0
owner/count  : 000000000000000000 flags    : 000000000000000000
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 331.331 (syz-executor.4) @ 0xfffffe4d9b807600, l_stat=2

*** Locks held:

* Lock 0 (initialized at netbsd:uvmspace_alloc+0x339 uvm_map_setup sys/uvm/uvm_map.c:4772 [inline])
* Lock 0 (initialized at netbsd:uvmspace_alloc+0x339 uvmspace_init sys/uvm/uvm_map.c:4115 [inline])
* Lock 0 (initialized at netbsd:uvmspace_alloc+0x339 sys/uvm/uvm_map.c:4094)
lock address : fffffe4d9963e1a8
type         : sleep/adaptive
initialized  : netbsd:uvmspace_alloc+0x339
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xfffffe4d9b807600 last held: 0xfffffe4d9b807600
last locked* : netbsd:vm_map_lock+0x146
unlocked     : netbsd:uvm_fault_lower_enter+0x88c
owner/count  : 000000000000000000 flags    : 000000000000000000
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 742.742 (dhcpcd) @ 0xfffffe4d99507b40, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x1c sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x1c
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xfffffe4d99507b40 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 465.465 (dhcpcd) @ 0xfffffe4d998eabc0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x1c sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x1c
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xfffffe4d998eabc0 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 290.290 (dhcpcd) @ 0xfffffe4d99787300, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x1c sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x1c
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xfffffe4d99787300 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 289.289 (dhcpcd) @ 0xfffffe4d998ea780, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x1c sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x1c
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xfffffe4d998ea780 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.11 (iflnkst) @ 0xfffffe4ebd55e100, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x1c sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x1c
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  0
relevant lwp : 0xfffffe4ebd55e100 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.5 (softclk/0) @ 0xfffffe4ebe5ba080, l_stat=1

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x1c sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x1c
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xfffffe4ebe5ba080 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.0 (swapper) @ 0xffffffff86740cc0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:module_hook_init+0x1c sys/kern/kern_module_hook.c:132)
lock address : netbsd:module_hook
type         : sleep/adaptive
initialized  : netbsd:module_hook_init+0x1c
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffffff86740cc0 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

[Locks tracked through CPUs]

******* Locks held on cpu1:

* Lock 0 (initialized at netbsd:kprintf_init+0x72 sys/kern/subr_prf.c:157)
lock address : netbsd:kprintf_mtx
type         : spin
initialized  : netbsd:kprintf_init+0x72
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xfffffe4d9adc6540 last held: 0xfffffe4d9adc6540
last locked* : netbsd:kprintf_lock+0x50
unlocked     : netbsd:kprintf_unlock+0x70
owner field  : 0x0000000000000800 wait/spin:                0/1

              PAGE FLAG   PQ            UOBJECT              UANON
0xffffcf0000007180 0045 00000000                0x0                0x0
0xffffcf0000007200 0045 00000000                0x0                0x0
0xffffcf0000007280 0045 00000000                0x0                0x0
0xffffcf0000007300 0045 00000000                0x0                0x0
0xffffcf0000007380 0045 00000000                0x0                0x0
0xffffcf0000007400 0045 00000000                0x0                0x0
0xffffcf0000007480 0045 00000000                0x0                0x0
0xffffcf0000007500 0045 00000000                0x0                0x0
0xffffcf0000007580 0045 00000000                0x0                0x0
0xffffcf0000007600 0045 00000000                0x0                0x0
0xffffcf0000007680 0041 00000000                0x0                0x0
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0xffffcf0000014a80 0041 00000000                0x0                0x0
0xffffcf0000014b00 0041 00000000                0x0                0x0
0xffffcf0000014b80 0041 00000000                0x0                0x0
0xffffcf0000014c00 0041 00000000                0x0                0x0
0xffffcf0000014c80 0041 00000000                0x0                0x0
0xffffcf0000014d00 0041 00000000                0x0                0x0
0xffffcf0000014d80 0041 00000000                0x0                0x0
0xffffcf0000014e00 0041 00000000                0x0                0x0
0xffffcf0000014e80 0041 00000000                0x0                0x0
0xffffcf0000014f00 0041 00000000                0x0                0x0
0xffffcf0000014f80 0041 00000000                0x0                0x0
0xffffcf0000015000 0041 00000000                0x0                0x0
0xffffcf0000015080 0041 00000000                0x0                0x0
0xffffcf0000015100 0041 00000000                0x0                0x0
0xffffcf0000015180 0041 00000000                0x0                0x0
0xffffcf0000015200 0041 00000000                0x0                0x0
0xffffcf0000015280 0041 00000000                0x0                0x0
0xffffcf0000015300 0041 00000000                0x0                0x0
0xffffcf0000015380 0041 00000000                0x0                0x0
0xffffcf0000015400 0041 00000000                0x0                0x0
0xffffcf0000015480 0041 00000000                0x0                0x0
0xffffcf0000015500 0041 00000000                0x0                0x0
0xffffcf0000015580 0041 00000000                0x0                0x0
0xffffcf0000015600 0041 00000000                0x0                0x0
0xffffcf0000015680 0041 00000000                0x0                0x0
0xffffcf0000015700 0041 00000000                0x0                0x0
0xffffcf0000015780 0041 00000000                0x0                0x0
0xffffcf0000015800 0041 00000000                0x0                0x0
0xffffcf0000015880 0041 00000000                0x0                0x0
0xffffcf0000015900 0041 00000000                0x0                0x0
0xffffcf0000015980 0041 00000000                0x0                0x0
0xffffcf0000015a00 0041 00000000                0x0                0x0
0xffffcf0000015a80 0041 00000000                0x0                0x0
0xffffcf0000015b00 0041 00000000                0x0                0x0
0xffffcf0000015b80 0041 00000000                0x0                0x0
0xffffcf0000015c00 0041 00000000                0x0                0x0
0xffffcf0000015c80 0041 00000000                0x0                0x0
0xffffcf0000015d00 0001 00000000                0x0                0x0
0xffffcf0000015d80 0001 00000000                0x0                0x0
0xffffcf0000015e00 0001 00000000                0x0                0x0
0xffffcf0000015e80 0001 00000000                0x0                0x0
0xffffcf0000015f00 0001 00000000                0x0                0x0
0xffffcf0000015f80 0001 00000000                0x0                0x0
0xffffcf0000016000 0001 00000000                0x0                0x0
0xffffcf0000016080 0001 00000000                0x0                0x0
0xffffcf0000016100 0001 00000000                0x0                0x0
0xffffcf0000016180 0001 00000000                0x0                0x0
0xffffcf0000016200 0001 00000000                0x0                0x0
0xffffcf0000016280 0001 00000000                0x0                0x0
0xffffcf0000016300 0001 00000000                0x0                0x0
0xffffcf0000016380 0001 00000000                0x0                0x0
0xffffcf0000016400 0001 00000000                0x0                0x0
0xffffcf0000016480 0001 00000000                0x0                0x0
0xffffcf0000016500 0001 00000000                0x0                0x0
0xffffcf0000016580 0001 00000000                0x0                0x0
0xffffcf0000016600 0001 00000000                0x0                0x0
0xffffcf0000016680 0001 00000000                0x0                0x0
0xffffcf0000016700 0001 00000000                0x0                0x0
0xffffcf0000016780 0001 00000000                0x0                0x0
0xffffcf0000016800 0001 00000000                0x0                0x0
0xffffcf0000016880 0001 00000000                0x0                0x0
0xffffcf0000016900 0001 00000000                0x0                0x0
0xffffcf0000016980 0001 00000000                0x0                0x0
0xffffcf0000016a00 0001 00000000                0x0                0x0
0xffffcf0000016a80 0001 00000000                0x0                0x0
0xffffcf0000016b00 0001 00000000                0x0                0x0
0xffffcf0000016b80 0001 00000000                0x0                0x0
0xffffcf0000016c00 0001 00000000                0x0                0x0
0xffffcf0000016c80 0001 00000000                0x0                0x0
0xffffcf0000016d00 0001 00000000                0x0                0x0
0xffffcf0000016d80 0001 00000000                0x0                0x0
0xffffcf0000016e00 0001 00000000                0x0                0x0
0xffffcf0000016e80 0001 00000000                0x0                0x0
0xffffcf0000016f00 0001 00000000                0x0                0x0
0xffffcf0000016f80 0001 00000000                0x0                0x0
0xffffcf0000017000 0001 00000000                0x0                0x0
0xffffcf0000017080 0001 00000000                0x0                0x0
0xffffcf0000017100 0001 00000000                0x0                0x0
0xffffcf0000017180 0001 00000000                0x0                0x0
0xffffcf0000017200 0001 00000000                0x0                0x0
0xffffcf0000017280 0001 00000000                0x0                0x0
0xffffcf0000017300 0001 00000000                0x0                0x0
0xffffcf0000017380 0001 00000000                0x0                0x0
0xffffcf0000017400 0001 00000000                0x0                0x0
0xffffcf0000017480 0001 00000000                0x0                0x0
0xffffcf0000017500 0001 00000000                0x0                0x0
0xffffcf0000017580 0001 00000000                0x0                0x0
0xffffcf0000017600 0001 00000000                0x0                0x0
0xffffcf0000017680 0001 00000000                0x0                0x0
0xffffcf0000017700 0001 00000000                0x0                0x0
0xffffcf0000017780 0001 00000000                0x0                0x0
0xffffcf0000017800 0041 00000000                0x0                0x0
0xffffcf0000017880 0041 00000000                0x0                0x0
0xffffcf0000017900 0041 00000000                0x0                0x0
0xffffcf0000017980 0041 00000000                0x0                0x0
0xffffcf0000017a00 0041 00000000                0x0                0x0
0xffffcf0000017a80 0041 00000000                0x0                0x0
0xffffcf0000017b00 0041 00000000                0x0                0x0
0xffffcf0000017b80 0041 00000000                0x0                0x0
0xffffcf0000017c00 0041 00000000                0x0                0x0
0xffffcf0000017c80 0041 00000000                0x0                0x0
0xffffcf0000017d00 0041 00000000                0x0                0x0
0xffffcf0000017d80 0041 00000000                0x0                0x0
0xffffcf0000017e00 0041 00000000                0x0                0x0
0xffffcf0000017e80 0041 00000000                0x0                0x0
0xffffcf0000017f00 0041 00000000                0x0                0x0
0xffffcf0000017f80 0041 00000000                0x0                0x0
0xffffcf0000018000 0041 00000000                0x0                0x0
0xffffcf0000018080 0041 00000000                0x0                0x0
0xffffcf0000018100 0041 00000000                0x0                0x0
0xffffcf0000018180 0041 00000000                0x0                0x0
0xffffcf0000018200 0041 00000000                0x0                0x0
0xffffcf0000018280 0041 00000000                0x0                0x0
0xffffcf0000018300 0041 00000000                0x0                0x0
0xffffcf0000018380 0041 00000000                0x0                0x0
0xffffcf0000018400 0041 00000000                0x0                0x0
0xffffcf0000018480 0041 00000000                0x0                0x0
0xffffcf0000018500 0041 00000000                0x0                0x0
0xffffcf0000018580 0041 00000000                0x0                0x0
0xffffcf0000018600 0041 00000000                0x0                0x0
0xffffcf0000018680 0041 00000000                0x0                0x0
0xffffcf0000018700 0041 00000000                0x0                0x0
0xffffcf0000018780 0041 00000000                0x0                0x0
0xffffcf0000018800 0041 00000000                0x0                0x0
0xffffcf0000018880 0041 00000000                0x0                0x0
0xffffcf0000018900 0041 00000000                0x0                0x0
0xffffcf0000018980 0041 00000000                0x0                0x0
0xffffcf0000018a00 0041 00000000                0x0                0x0
0xffffcf0000018a80 0041 00000000                0x0                0x0
0xffffcf0000018b00 0041 00000000                0x0                0x0
0xffffcf0000018b80 0041 00000000                0x0                0x0
0xffffcf0000018c00 0041 00000000                0x0                0x0
0xffffcf0000018c80 0041 00000000                0x0                0x0
0xffffcf0000018d00 0041 00000000                0x0                0x0
0xffffcf0000018d80 0001 00000000                0x0                0x0
0xffffcf0000018e00 0001 00000000                0x0                0x0
0xffffcf0000018e80 0001 00000000                0x0                0x0
0xffffcf0000018f00 0001 00000000                0x0                0x0
0xffffcf0000018f80 0001 00000000                0x0                0x0
0xffffcf0000019000 0001 00000000                0x0                0x0
0xffffcf0000019080 0001 00000000                0x0                0x0
0xffffcf0000019100 0001 00000000                0x0                0x0
0xffffcf0000019180 0001 00000000                0x0                0x0
0xffffcf0000019200 0001 00000000                0x0                0x0
0xffffcf0000019280 0001 00000000                0x0                0x0
0xffffcf0000019300 0001 00000000                0x0                0x0
0xffffcf0000019380 0001 00000000                0x0                0x0
0xffffcf0000019400 0001 00000000                0x0                0x0
0xffffcf0000019480 0001 00000000                0x0                0x0
0xffffcf0000019500 0001 00000000                0x0                0x0
0xffffcf0000019580 0001 00000000                0x0                0x0
0xffffcf0000019600 0001 00000000                0x0                0x0
0xffffcf0000019680 0001 00000000                0x0                0x0
0xffffcf0000019700 0001 00000000                0x0                0x0
0xffffcf0000019780 0001 00000000                0x0                0x0
0xffffcf0000019800 0001 00000000                0x0                0x0
0xffffcf0000019880 0001 00000000                0x0                0x0
0xffffcf0000019900 0001 00000000                0x0                0x0
0xffffcf0000019980 0001 00000000                0x0                0x0
0xffffcf0000019a00 0001 00000000                0x0                0x0
0xffffcf0000019a80 0001 00000000                0x0                0x0
0xffffcf0000019b00 0001 00000000                0x0                0x0
0xffffcf0000019b80 0001 00000000                0x0                0x0
0xffffcf0000019c00 0001 00000000                0x0                0x0
0xffffcf0000019c80 0001 00000000                0x0                0x0
0xffffcf0000019d00 0001 00000000                0x0                0x0
0xffffcf0000019d80 0001 00000000                0x0                0x0
0xffffcf0000019e00 0001 00000000                0x0                0x0
0xffffcf0000019e80 0001 00000000                0x0                0x0
0xffffcf0000019f00 0001 00000000                0x0                0x0
0xffffcf0000019f80 0001 00000000                0x0                0x0
0xffffcf000001a000 0001 00000000                0x0                0x0
0xffffcf000001a080 0001 00000000                0x0                0x0
0xffffcf000001a100 0001 00000000                0x0                0x0
0xffffcf000001a180 0001 00000000                0x0                0x0
0xffffcf000001a200 0001 00000000                0x0                0x0
0xffffcf000001a280 0001 00000000                0x0                0x0
0xffffcf000001a300 0001 00000000                0x0                0x0
0xffffcf000001a380 0001 00000000                0x0                0x0
0xffffcf000001a400 0001 00000000                0x0                0x0
0xffffcf000001a480 0001 00000000                0x0                0x0
0xffffcf000001a500 0001 00000000                0x0                0x0
0xffffcf000001a580 0001 00000000                0x0                0x0
0xffffcf000001a600 0001 00000000                0x0                0x0
0xffffcf000001a680 0001 00000000                0x0                0x0
0xffffcf000001a700 0001 00000000      

Tested on:

commit:         8d0cc366 tests/make: remove nonexistent file from file..
git tree:       https://github.com/NetBSD/src trunk
console output: https://syzkaller.appspot.com/x/log.txt?x=11bdb283080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1420f906d33d9f1f
dashboard link: https://syzkaller.appspot.com/bug?extid=1bee937496ae35ea301c
compiler:       g++ (Debian 10.2.1-6) 10.2.1 20210110
patch:          https://syzkaller.appspot.com/x/patch.diff?x=10caf7fb080000

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