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ASan: Unauthorized Access in sl_compress_setup (2)



Hello,

syzbot found the following issue on:

HEAD commit:    b2782b14a8e5 libm: Add missing fma(3) and friends for sh3.
git tree:       netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=10671cbca80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fab579639ba4bf0a
dashboard link: https://syzkaller.appspot.com/bug?extid=6d16c9e158e5a078835d
compiler:       g++ (Debian 10.2.1-6) 10.2.1 20210110

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bf5d504921ff/disk-b2782b14.raw.xz
netbsd.gdb: https://storage.googleapis.com/syzbot-assets/d1acfc681b10/netbsd-b2782b14.gdb.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6d16c9e158e5a078835d%syzkaller.appspotmail.com@localhost

[ 396.8840555] panic: ASan: Unauthorized Access In 0xffffffff81e07bef: Addr 0xffffaf8011468c80 [8 bytes, write, KmemRedZone]

[ 396.8956645] cpu0: Begin traceback...
[ 396.9040469] vpanic() at netbsd:vpanic+0x282 sys/kern/subr_prf.c:292
[ 396.9640434] panic() at netbsd:panic+0x9e sys/kern/subr_prf.c:1060
[ 397.0040444] kasan_report() at netbsd:kasan_report+0x8f kasan_code_name sys/kern/subr_asan.c:169 [inline]
[ 397.0040444] kasan_report() at netbsd:kasan_report+0x8f sys/kern/subr_asan.c:201
[ 397.0440443] __asan_store8() at netbsd:__asan_store8+0xaf kasan_shadow_8byte_isvalid sys/kern/subr_asan.c:371 [inline]
[ 397.0440443] __asan_store8() at netbsd:__asan_store8+0xaf kasan_shadow_check sys/kern/subr_asan.c:421 [inline]
[ 397.0440443] __asan_store8() at netbsd:__asan_store8+0xaf sys/kern/subr_asan.c:1208
[ 397.0840481] sl_compress_setup() at netbsd:sl_compress_setup+0xea sys/net/slcompress.c:110
[ 397.1240453] pppioctl() at netbsd:pppioctl+0x1515 sys/net/if_ppp.c:589
[ 397.1640463] ppptioctl() at netbsd:ppptioctl+0x210 sys/net/ppp_tty.c:477
[ 397.2040439] ptyioctl() at netbsd:ptyioctl+0x14e sys/kern/tty_pty.c:1180
[ 397.2440450] cdev_ioctl() at netbsd:cdev_ioctl+0x197 sys/kern/subr_devsw.c:1525
[ 397.2840443] spec_ioctl() at netbsd:spec_ioctl+0x148 sys/miscfs/specfs/spec_vnops.c:1331
[ 397.3240453] VOP_IOCTL() at netbsd:VOP_IOCTL+0x132 sys/kern/vnode_if.c:933
[ 397.3640438] vn_ioctl() at netbsd:vn_ioctl+0x1c4 sys/kern/vfs_vnops.c:892
[ 397.4040443] sys_ioctl() at netbsd:sys_ioctl+0x8f6 sys/kern/sys_generic.c:675
[ 397.4440500] sys___syscall() at netbsd:sys___syscall+0x10e sy_call sys/sys/syscallvar.h:65 [inline]
[ 397.4440500] sys___syscall() at netbsd:sys___syscall+0x10e sys/kern/sys_syscall.c:90
[ 397.4840448] syscall() at netbsd:syscall+0x25a sy_call sys/sys/syscallvar.h:65 [inline]
[ 397.4840448] syscall() at netbsd:syscall+0x25a sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 397.4840448] syscall() at netbsd:syscall+0x25a sys/arch/x86/x86/syscall.c:138
[ 397.4940423] --- syscall (number 54 via SYS_syscall) ---
[ 397.5140452] netbsd:syscall+0x25a:
[ 397.5140452] cpu0: End traceback...
[ 397.5244165] fatal breakpoint trap in supervisor mode
[ 397.5244165] trap type 1 code 0 rip 0xffffffff8023241d cs 0x8 rflags 0x286 cr2 0x40eb30 ilevel 0x4 rsp 0xffffaf82487604f0
[ 397.5400360] curlwp 0xffffaf80142a9a40 pid 4500.8010 lowest kstack 0xffffaf82487592c0
Stopped in pid 4500.8010 (syz-executor.1) 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:292
panic() at netbsd:panic+0x9e sys/kern/subr_prf.c:1060
kasan_report() at netbsd:kasan_report+0x8f kasan_code_name sys/kern/subr_asan.c:169 [inline]
kasan_report() at netbsd:kasan_report+0x8f sys/kern/subr_asan.c:201
__asan_store8() at netbsd:__asan_store8+0xaf kasan_shadow_8byte_isvalid sys/kern/subr_asan.c:371 [inline]
__asan_store8() at netbsd:__asan_store8+0xaf kasan_shadow_check sys/kern/subr_asan.c:421 [inline]
__asan_store8() at netbsd:__asan_store8+0xaf sys/kern/subr_asan.c:1208
sl_compress_setup() at netbsd:sl_compress_setup+0xea sys/net/slcompress.c:110
pppioctl() at netbsd:pppioctl+0x1515 sys/net/if_ppp.c:589
ppptioctl() at netbsd:ppptioctl+0x210 sys/net/ppp_tty.c:477
ptyioctl() at netbsd:ptyioctl+0x14e sys/kern/tty_pty.c:1180
cdev_ioctl() at netbsd:cdev_ioctl+0x197 sys/kern/subr_devsw.c:1525
spec_ioctl() at netbsd:spec_ioctl+0x148 sys/miscfs/specfs/spec_vnops.c:1331
VOP_IOCTL() at netbsd:VOP_IOCTL+0x132 sys/kern/vnode_if.c:933
vn_ioctl() at netbsd:vn_ioctl+0x1c4 sys/kern/vfs_vnops.c:892
sys_ioctl() at netbsd:sys_ioctl+0x8f6 sys/kern/sys_generic.c:675
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 54 via SYS_syscall) ---
netbsd:syscall+0x25a:
Panic string: ASan: Unauthorized Access In 0xffffffff81e07bef: Addr 0xffffaf8011468c80 [8 bytes, write, KmemRedZone]

PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
4500 >8010 7   0       100   ffffaf80142a9a40     syz-executor.1
4500  4500 2   0  10000000   ffffaf8012cde580     syz-executor.1
9425  4350 2   0       100   ffffaf8012a49340     syz-executor.4
9425  9425 2   0  10000000   ffffaf8012c92780     syz-executor.4
4333  4333 3   1       180   ffffaf801407a980     syz-executor.1 nanoslp
7903  7903 3   0       1c0   ffffaf8014168180     syz-executor.5 pipe_rd
4544  4544 3   0       180   ffffaf8012b7a980     syz-executor.4 nanoslp
1387  1387 2   1       140   ffffaf8012c79300     syz-executor.0
5863  5863 3   1       180   ffffaf8012c37280     syz-executor.4 parked
5424  1885 3   1  11100000   ffffaf8012d96480     syz-executor.4 vfork
5424  5424 3   0  11000000   ffffaf8012cc30c0     syz-executor.4 lwpwait
5094  5094 3   0       180   ffffaf8013430700     syz-executor.4 parked
5075  1772 3   0  11100000   ffffaf8013443740     syz-executor.4 vfork
5075  5075 2   1  11000040   ffffaf80133a0180     syz-executor.4
4447  4447 3   0       180   ffffaf8013efabc0     syz-executor.4 parked
3249  3249 3   0       180   ffffaf8013498140     syz-executor.3 parked
3383  3383 3   1       180   ffffaf8012d27280     syz-executor.3 parked
1224  2453 2   1       100   ffffaf8012ca4480         syz-fuzzer
1224  1206 3   1       180   ffffaf8013ef1b80         syz-fuzzer wait
1224  1240 3   0       1c0   ffffaf8013e0db00         syz-fuzzer parked
1224   829 3   1       1c0   ffffaf8013de7680         syz-fuzzer wait
1224   449 3   1       180   ffffaf8013de7240         syz-fuzzer parked
1224  1244 3   1       1c0   ffffaf8013dd7640         syz-fuzzer wait
1224 > 929 7   1       100   ffffaf8012a708c0         syz-fuzzer
1224  1128 2   1   1000100   ffffaf8013cf71c0         syz-fuzzer
1224  1132 3   0       180   ffffaf8012d33b40         syz-fuzzer parked
1224  1120 3   1       180   ffffaf80133eab00         syz-fuzzer wait
1224   942 3   0       180   ffffaf80133ea6c0         syz-fuzzer parked
1224   987 3   1       180   ffffaf80134b3180         syz-fuzzer parked
1224  1237 3   0       180   ffffaf80126ebbc0         syz-fuzzer nanoslp
1224  1224 3   0       180   ffffaf8012aa5080         syz-fuzzer parked
1080  1080 3   0       180   ffffaf8012cde140               sshd select
1223  1223 3   0       180   ffffaf801347c100              getty nanoslp
1151  1151 3   1       180   ffffaf80126eb340              getty nanoslp
1222  1222 3   0       180   ffffaf80134989c0              getty nanoslp
1082  1082 3   1       1c0   ffffaf80134b35c0              getty ttyraw
1102  1102 3   0       180   ffffaf80133b7a40               sshd select
1088  1088 3   1       180   ffffaf8012d46b80             powerd kqueue
700    700 3   0       180   ffffaf8013430b40            syslogd kqueue
746    746 3   1       180   ffffaf8012c37b00             dhcpcd poll
747    747 3   1       180   ffffaf8012cc3500             dhcpcd poll
466    466 3   0       180   ffffaf8012c376c0             dhcpcd poll
598    598 3   0       180   ffffaf8012c58b40             dhcpcd poll
292    292 3   1       180   ffffaf8012dae900             dhcpcd poll
485    485 3   0       180   ffffaf8012dae4c0             dhcpcd poll
291    291 3   0       180   ffffaf8012dae080             dhcpcd poll
1        1 3   0       180   ffffaf8012877180               init wait
0     4343 5   0       300   ffffaf8012d276c0           (zombie)
0     3490 3   1       200   ffffaf8012d18240             ktrace ktrwait
0     2688 3   0       200   ffffaf8012ca4040             ktrace ktrwait
0     3327 3   0       200   ffffaf8012cc3940             ktrace ktrwait
0     2288 3   0       200   ffffaf8012d96040             ktrace ktrwait
0     4141 3   1       200   ffffaf8013358980          acctwatch actwat
0      734 3   0       200   ffffaf80129a26c0            physiod physiod
0      196 3   1       200   ffffaf80129a4700          pooldrain pooldrain
0      195 3   0       200   ffffaf80129a42c0            ioflush syncer
0      194 3   0       200   ffffaf80129a2b00           pgdaemon pgdaemon
0      169 3   1       200   ffffaf8012962ac0               usb7 usbevt
0      172 3   1       200   ffffaf8012962680               usb6 usbevt
0      170 3   0       200   ffffaf8012962240               usb5 usbevt
0      168 3   0       200   ffffaf8012915a80               usb4 usbevt
0      166 3   0       200   ffffaf8012915640               usb3 usbevt
0      165 3   0       200   ffffaf8012915200               usb2 usbevt
0       31 3   1       200   ffffaf80128d9a40               usb1 usbevt
0       63 3   0       200   ffffaf80128d9600               usb0 usbevt
0      126 3   0       200   ffffaf80128d91c0         usbtask-dr usbtsk
0      125 3   1       200   ffffaf8012877a00         usbtask-hc usbtsk
0      124 3   0       200   ffffaf8010d76b00          swwreboot swwreboot
0      123 3   0       200   ffffaf80128775c0             npfgc0 npfgcw
0      122 3   0       200   ffffaf801286b9c0            rt_free rt_free
0      121 3   0       200   ffffaf801286b580              unpgc unpgc
0      120 3   0       200   ffffaf801286b140    key_timehandler key_timehandler
0      119 3   1       200   ffffaf801271b980    icmp6_wqinput/1 icmp6_wqinput
0      118 3   0       200   ffffaf801271b540    icmp6_wqinput/0 icmp6_wqinput
0      117 3   0       200   ffffaf801271b100          nd6_timer nd6_timer
0      116 3   1       200   ffffaf8012713940    carp6_wqinput/1 carp6_wqinput
0      115 3   0       200   ffffaf8012713500    carp6_wqinput/0 carp6_wqinput
0      114 3   1       200   ffffaf80127130c0     carp_wqinput/1 carp_wqinput
0      113 3   0       200   ffffaf8012704900     carp_wqinput/0 carp_wqinput
0      112 3   1       200   ffffaf80127044c0     icmp_wqinput/1 icmp_wqinput
0      111 3   0       200   ffffaf8012704080     icmp_wqinput/0 icmp_wqinput
0      110 3   0       200   ffffaf80126ec8c0           rt_timer rt_timer
0      109 3   0       200   ffffaf80126e8b80        vmem_rehash vmem_rehash
0      100 3   0       200   ffffaf80126e8300          entbutler entropy
0       99 3   0       200   ffffaf80120bdb40              viomb balloon
0       98 3   1       200   ffffaf80120bd700      vioif0_txrx/1 vioif0_txrx
0       97 3   0       200   ffffaf80120bd2c0      vioif0_txrx/0 vioif0_txrx
0       30 3   0       200   ffffaf8010d766c0           scsibus0 sccomp
0       29 3   0       200   ffffaf8010d76280               pms0 pmsreset
0       28 3   1       200   ffffaf8010cbcac0            xcall/1 xcall
0       27 1   1       200   ffffaf8010cbc680          softser/1
0    >  26 7   1       200   ffffaf8010cbc240          softclk/1
0       25 1   1       200   ffffaf8010cb9a80          softbio/1
0       24 1   1       200   ffffaf8010cb9640          softnet/1
0       23 1   1       201   ffffaf8010cb9200             idle/1
0       22 3   0       200   ffffaf800fb56a40           lnxsyswq lnxsyswq
0       21 3   0       200   ffffaf800fb56600           lnxubdwq lnxubdwq
0       20 3   0       200   ffffaf800fb561c0           lnxpwrwq lnxpwrwq
0       19 3   0       200   ffffaf800fb55a00           lnxlngwq lnxlngwq
0       18 3   0       200   ffffaf800fb555c0           lnxhipwq lnxhipwq
0       17 3   0       200   ffffaf800fb55180           lnxrcugc lnxrcugc
0       16 3   0       200   ffffaf800fb4e9c0             sysmon smtaskq
0       15 3   0       200   ffffaf800fb4e580         pmfsuspend pmfsuspend
0       14 3   0       200   ffffaf800fb4e140           pmfevent pmfevent
0       13 3   0       200   ffffaf800fb4a980         sopendfree sopendfr
0       12 3   0       200   ffffaf800fb4a540             ifwdog ifwdog
0       11 3   1       200   ffffaf800fb4a100            iflnkst iflnkst
0       10 3   0       200   ffffaf800fb3d940           nfssilly nfssilly
0        9 3   0       200   ffffaf800fb3d500             vdrain vdrain
0        8 3   1       200   ffffaf800fb3d0c0          modunload mod_unld
0        7 3   0       200   ffffaf800fb34900            xcall/0 xcall
0        6 1   0       200   ffffaf800fb344c0          softser/0
0        5 1   0       200   ffffaf800fb34080          softclk/0
0        4 1   0       200   ffffaf800fb328c0          softbio/0
0        3 1   0       200   ffffaf800fb32480          softnet/0
0        2 1   0       201   ffffaf800fb32040             idle/0
0        0 3   0       200   ffffffff8334bc00            swapper uvm
[Locks tracked through LWPs]

****** LWP 1387.1387 (syz-executor.0) @ 0xffffaf8012c79300, l_stat=2

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at netbsd:xc_init_cpu+0xc3 xc_init sys/kern/subr_xcall.c:152 [inline])
* Lock 0 (initialized at netbsd:xc_init_cpu+0xc3 sys/kern/subr_xcall.c:242)
lock address : netbsd:xc_low_pri
type         : sleep/adaptive
initialized  : netbsd:xc_init_cpu+0xc3
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  1
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffffaf8012c79300 last held: 000000000000000000
last locked  : netbsd:xc_thread+0x122
unlocked*    : netbsd:cv_enter+0x245
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 747.747 (dhcpcd) @ 0xffffaf8012cc3500, 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 : 0xffffaf8012cc3500 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 466.466 (dhcpcd) @ 0xffffaf8012c376c0, 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 : 0xffffaf8012c376c0 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 485.485 (dhcpcd) @ 0xffffaf8012dae4c0, 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 : 0xffffaf8012dae4c0 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 291.291 (dhcpcd) @ 0xffffaf8012dae080, 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 : 0xffffaf8012dae080 last held: 000000000000000000
last locked  : 0
unlocked*    : 0
owner field  : 000000000000000000 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.26 (softclk/1) @ 0xffffaf8010cbc240, l_stat=7

*** Locks held:

* Lock 0 (initialized at netbsd:soinit+0x1f9 sys/kern/uipc_socket.c:459)
lock address : ffffaf800f67d080
type         : sleep/adaptive
initialized  : netbsd:soinit+0x1f9
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  1 last held:                  1
relevant lwp : 0xffffaf8010cbc240 last held: 0xffffaf8010cbc240
last locked* : netbsd:ip_slowtimo+0x21
unlocked     : netbsd:sopoll+0x1a0
owner field  : 0xffffaf8010cbc240 wait/spin:                0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted:

* Lock 0 (initialized at netbsd:main+0x12e sys/kern/init_main.c:305)
lock address : netbsd:kernel_lock
type         : spin
initialized  : netbsd:main+0x12e
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  1
relevant cpu :                  1 last held:                  0
relevant lwp : 0xffffaf8010cbc240 last held: 0xffffaf80142a9a40
last locked* : netbsd:cdev_ioctl+0x218
unlocked     : netbsd:doifioctl+0x191f
curcpu holds :                  2 wanted by: 000000000000000000

****** LWP 0.11 (iflnkst) @ 0xffffaf800fb4a100, 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 : 0xffffaf800fb4a100 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) @ 0xffffaf800fb34080, 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 : 0xffffaf800fb34080 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) @ 0xffffffff8334bc00, 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 : 0xffffffff8334bc00 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 cpu0:

* Lock 0 (initialized at netbsd:main+0x12e sys/kern/init_main.c:305)
lock address : netbsd:kernel_lock
type         : spin
initialized  : netbsd:main+0x12e
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  1
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffaf80142a9a40 last held: 0xffffaf80142a9a40
last locked* : netbsd:cdev_ioctl+0x218
unlocked     : netbsd:doifioctl+0x191f
curcpu holds :                  2 wanted by: 000000000000000000

* Lock 1 (initialized at netbsd:kprintf_init+0x61 sys/kern/subr_prf.c:156)
lock address : netbsd:kprintf_mtx
type         : spin
initialized  : netbsd:kprintf_init+0x61
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                  0
relevant cpu :                  0 last held:                  0
relevant lwp : 0xffffaf80142a9a40 last held: 0xffffaf80142a9a40
last locked* : netbsd:kprintf_lock+0x33
unlocked     : netbsd:kprintf_unlock+0x53
owner field  : 0x0000000000000800 wait/spin:                0/1

              PAGE FLAG   PQ            UOBJECT              UANON
0xffffaf8000017180 0041 00000000                0x0                0x0
0xffffaf8000017200 0041 00000000                0x0                0x0
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0xffffaf8000029400 0001 00000000                0x0                0x0
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0xffffaf8000029500 0001 00000000                0x0                0x0
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0xffffaf8000029700 0001 00000000                0x0                0x0
0xffffaf8000029780 0001 00000000                0x0                0x0
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0xffffaf8000029a00 0001 00000000                0x0                0x0
0xffffaf8000029a80 0001 00000000                0x0                0x0
0xffffaf8000029b00 0001 00000000                0x0                0x0
0xffffaf8000029b80 0001 00000000                0x0                0x0
0xffffaf8000029c00 0001 00000000                0x0                0x0
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0xffffaf8000029d00 0001 00000000                0x0                0x0
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0xffffaf8000029e00 0001 00000000                0x0                0x0
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0xffffaf8000029f00 0001 00000000                0x0                0x0
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0xffffaf800002a000 0001 00000000                0x0                0x0
0xffffaf800002a080 0001 00000000                0x0                0x0
0xffffaf800002a100 0001 00000000                0x0                0x0
0xffffaf800002a180 0001 00000000                0x0                0x0
0xffffaf800002a200 0001 00000000                0x0                0x0
0xffffaf800002a280 0001 00000000                0x0                0x0
0xffffaf800002a300 0001 00000000                0x0                0x0
0xffffaf800002a380 0001 00000000                0x0                0x0
0xffffaf800002a400 0001 00000000                0x0                0x0
0xffffaf800002a480 0001 00000000                0x0                0x0
0xffffaf800002a500 0001 00000000                0x0                0x0
0xffffaf800002a580 0001 00000000                0x0                0x0
0xffffaf800002a600 0001 00000000                0x0                0x0
0xffffaf800002a680 0001 00000000                0x0                0x0
0xffffaf800002a700 0001 00000000                0x0                0x0
0xffffaf800002a780 0001 00000000                0x0                0x0
0xffffaf800002a800 0001 00000000                0x0                0x0
0xffffaf800002a880 0001 00000000                0x0                0x0
0xffffaf800002a900 0001 00000000                0x0                0x0
0xffffaf800002a980 0001 00000000                0x0                0x0
0xffffaf800002aa00 0001 00000000                0x0                0x0
0xffffaf800002aa80 0001 00000000                0x0                0x0
0xffffaf800002ab00 0001 00000000                0x0          

---
This report is generated by a bot. It may contain errors.
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syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

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#syz dup: exact-subject-of-another-report

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#syz undup

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