KASAN: invalid memory access in witness_checkorder
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syzbot
Jul 13, 2026, 5:01:27 AMJul 13
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: dbfd7807b1e0 kasan: debug free-quarantine for M_PINSYSCALL
git tree: https://github.com/blackgnezdo/openbsd-src.git syzbot-kasan
console output: https://syzkaller.appspot.com/x/log.txt?x=1085e0b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=85e25e37d09e1b88
dashboard link: https://syzkaller.appspot.com/bug?extid=a1a3c17d15d5df2f9ce8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/53b729308443/disk-dbfd7807.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/28cc9eea4b86/bsd-dbfd7807.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/14b18a026e2f/kernel-dbfd7807.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a1a3c1...@syzkaller.appspotmail.com
panic: Caught invalid memory access at ffff80003b3267d8 size 4 op 0
Stopped at db_enter+0x17: popq %rbp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
480708 5690 -1 0x10 0 0 syz-executor
*504592 24249 0 0x14000 0x200 1K reaper
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84635b4e) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff80003b3267d8) at __asan_load4_noabort+0xa3
witness_checkorder(ffff80003b3267b8,9,0) at witness_checkorder+0x111 sys/kern/subr_witness.c:779
mtx_enter(ffff80003b3267a8) at mtx_enter+0x105 sys/kern/kern_lock.c:406
knote_processexit(ffff80003b3266a0) at knote_processexit+0x43 sys/kern/kern_event.c:2236
reaper(ffff800029895760) at reaper+0x38d sys/kern/kern_exit.c:515
end trace frame: 0x0, count: 8
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: Caught invalid memory access at ffff80003b3267d8 size 4 op 0
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84635b4e) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff80003b3267d8) at __asan_load4_noabort+0xa3
witness_checkorder(ffff80003b3267b8,9,0) at witness_checkorder+0x111 sys/kern/subr_witness.c:779
mtx_enter(ffff80003b3267a8) at mtx_enter+0x105 sys/kern/kern_lock.c:406
knote_processexit(ffff80003b3266a0) at knote_processexit+0x43 sys/kern/kern_event.c:2236
reaper(ffff800029895760) at reaper+0x38d sys/kern/kern_exit.c:515
end trace frame: 0x0, count: -7
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800029893b10
rbx 0xffff800029893b80
rdx 0
rcx 0xffff800028fe3ff0
rax 0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xffff8000298938f8
r11 0xffffffff83f284c0 x86_bus_space_io_read_1
r12 0xffffffff84635b4e .str.23+0x9d50e
r13 0xffff800028fe4c08
r14 0xffff800028fe4e07
r15 0x1
rip 0xffffffff818a32b7 db_enter+0x17
cs 0x8
rflags 0x246
rsp 0xffff800029893b10
ss 0x10
db_enter+0x17: popq %rbp
ddb{1}> show proc
PROC (reaper) tid=504592 pid=24249 tcnt=1 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
runpri=32, usrpri=53, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045fff9f0,0xffff8000298954d8
process=0xffff800029802b50 user=0xffff800029888000, vmspace=0xffffffff854c0c80
estcpu=3, cpticks=26, pctcpu=0.2, user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
67421 34621 34004 0 2 0x10 syz-executor
67421 314828 34004 0 2 0x4000090 syz-executor
24999 350787 50568 0 2 0 syz-executor
24999 453710 50568 0 3 0x4000080 fsleep syz-executor
51485 200891 67686 0 2 0 syz-executor
51485 437832 67686 0 3 0x4000080 fsleep syz-executor
86202 366188 78698 0 2 0 syz-executor
86202 279335 78698 0 2 0x4000000 syz-executor
5690 480708 36876 -1 7 0x10 syz-executor
5690 151066 36876 -1 3 0x4000090 sbwait syz-executor
5690 145027 36876 -1 3 0x4000090 fsleep syz-executor
5690 311141 36876 -1 2 0x4000010 syz-executor
85432 420990 43789 0 3 0x100082 sbwait arp
43789 111274 66946 0 3 0x10008a sigsusp sh
66946 463573 9686 0 3 0x82 wait syz-executor
34004 417342 9686 0 2 0xc82 syz-executor
36876 348430 9686 0 3 0x82 nanoslp syz-executor
67686 212877 9686 0 3 0x82 nanoslp syz-executor
78698 273228 9686 0 2 0xc82 syz-executor
68026 292550 9686 0 3 0x2 biowait syz-executor
61937 480654 9686 0 3 0x82 wait syz-executor
50568 137388 9686 0 3 0x82 nanoslp syz-executor
9686 456423 90727 0 3 0x82 kqread syz-executor
90727 74928 10643 0 3 0x10008a sigsusp ksh
10643 240582 21529 0 3 0x98 kqread sshd-session
21529 451198 30527 0 3 0x92 kqread sshd-session
88731 355836 1 0 3 0x100083 ttyin getty
30527 151970 1 0 3 0x88 kqread sshd
31795 23979 6151 74 3 0x1100092 bpf pflogd
6151 451517 1 0 3 0x80 sbwait pflogd
43122 319903 24337 73 3 0x1100090 kqread syslogd
24337 396806 1 0 3 0x100082 sbwait syslogd
65924 454029 1 0 3 0x100080 kqread resolvd
91777 187606 75848 77 3 0x100092 kqread dhcpleased
19712 386143 75848 77 3 0x100092 kqread dhcpleased
75848 63974 1 0 3 0x80 kqread dhcpleased
60592 342809 0 0 3 0x14200 bored smr
10797 454492 0 0 2 0x14200 zerothread
36773 84309 0 0 3 0x14200 aiodoned aiodoned
52697 86013 0 0 3 0x14200 syncer update
15043 519430 0 0 3 0x14200 cleaner cleaner
*24249 504592 0 0 7 0x14200 reaper
1409 435902 0 0 3 0x14200 pgdaemon pagedaemon
24454 116845 0 0 3 0x14200 bored viomb
33035 23567 0 0 3 0x40014200 acpi0 acpi0
66564 77745 0 0 3 0x40014200 idle1
82193 227047 0 0 3 0x14200 bored softnet1
33114 200259 0 0 3 0x14200 bored softnet0
72560 26459 0 0 3 0x14200 bored systqmp
55369 81990 0 0 3 0x14200 bored systq
35940 495873 0 0 3 0x14200 tmoslp softclockmp
41026 422510 0 0 3 0x40014200 tmoslp softclock
45207 195470 0 0 3 0x40014200 idle0
1 519982 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 68026 (syz-executor) thread 0xffff800029912d08 (292550)
exclusive rrwlock inode r = 0 (0xffff800001d3c440)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xf0 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0x17e sys/kern/vfs_vops.c:527
#4 ufs_ihashins+0xda sys/ufs/ufs/ufs_ihash.c:146
#5 ffs_vget+0x2e9 sys/ufs/ffs/ffs_vfsops.c:1232
#6 ffs_inode_alloc+0x576 sys/ufs/ffs/ffs_alloc.c:393
#7 ufs_mkdir+0x25d sys/ufs/ufs/ufs_vnops.c:1112
#8 VOP_MKDIR+0x1a8 sys/kern/vfs_vops.c:394
#9 domkdirat+0x1f9 sys/kern/vfs_syscalls.c:3063
#10 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xffff800001bf1e98)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xf0 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0x17e sys/kern/vfs_vops.c:527
#4 vn_lock+0xca sys/kern/vfs_vnops.c:576
#5 vfs_lookup+0x1f7 sys/kern/vfs_lookup.c:431
#6 namei+0xe19 sys/kern/vfs_lookup.c:250
#7 domkdirat+0xe1 sys/kern/vfs_syscalls.c:3048
#8 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#9 Xsyscall+0x128
Process 24249 (reaper) thread 0xffff800029895760 (504592)
exclusive rwlock kqpsl r = 0 (0xffffffff852babb8)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320
#2 knote_processexit+0x2b sys/kern/kern_event.c:2235
#3 reaper+0x38d sys/kern/kern_exit.c:515
#4 proc_trampoline+0x10
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff854812c0)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:-1
#2 sleep_finish+0x423 sys/kern/kern_synch.c:369
#3 rw_do_enter_write+0x21f sys/kern/kern_rwlock.c:298
#4 knote_processexit+0x2b sys/kern/kern_event.c:2235
#5 reaper+0x38d sys/kern/kern_exit.c:515
#6 proc_trampoline+0x10
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11061 12251K 12534K 166960K 12389 0
pcb 17 24K 24K 166960K 64 0
rtable 225 11K 12K 166960K 333 0
pf 34 22K 38K 166960K 59 0
ifaddr 41 11K 12K 166960K 49 0
ifgroup 55 2K 2K 166960K 66 0
sysctl 4 1K 13K 166960K 11 0
counters 70 42K 43K 166960K 78 0
ioctlops 0 0K 4K 166960K 1505 0
iov 0 0K 16K 166960K 6 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1357 87K 87K 166960K 1594 0
UFS quota 1 36K 36K 166960K 1 0
UFS mount 5 44K 44K 166960K 5 0
shm 2 2K 14K 166960K 12 0
VM map 2 1K 1K 166960K 2 0
sem 10 0K 0K 166960K 10 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 292K 166960K 11964 0
file desc 18 65K 93K 166960K 295 0
sigio 1 0K 0K 166960K 70 0
proc 72 128K 177K 166960K 572 0
subproc 72 9K 9K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 20K 20K 166960K 1 0
in_multi 89 6K 6K 166960K 89 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 11 0
ISOFS mount 1 36K 36K 166960K 1 0
MSDOSFS mount 1 20K 20K 166960K 1 0
ttys 73 506K 506K 166960K 73 0
exec 0 0K 2K 166960K 391 0
fusefs mount 1 36K 36K 166960K 1 0
tdb 3 1K 1K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 241 239K 256K 166960K 4546 0
UVM aobj 17 4K 4K 166960K 18 0
pinsyscall 1068 1790K 1791K 166960K 1445 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 12 0K 1K 166960K 30 0
temp 37 9162K 9482K 166960K 6218 0
kqueue 16 43K 53K 166960K 61 0
SYN cache 2 16K 16K 166960K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 28 0 0 1 0 1 1 0 8 0
rtpcb 120 33 0 29 1 0 1 1 0 8 0
rtentry 176 105 0 1 5 0 5 5 0 8 0
unpcb 144 332 0 309 4 0 4 4 0 8 3
syncache 336 4 0 4 2 2 0 1 0 8 0
tcpcb 736 28 0 24 1 0 1 1 0 8 0
arp 136 18 0 0 1 0 1 1 0 8 0
inpcb 328 177 0 169 2 0 2 2 0 8 1
nd6 152 22 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
ppxss 1192 3 0 3 1 0 1 1 0 8 1
pffrag 232 3 0 0 1 0 1 1 0 482 0
pffrnode 88 3 0 0 1 0 1 1 0 8 0
pffrent 40 67 0 64 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 33 0 3 1 0 1 1 0 8 0
pfstkey 128 33 0 3 2 0 2 2 0 8 0
pfstate 448 33 0 3 4 0 4 4 0 8 0
pfrule 1360 23 0 18 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 414 0 0 26 0 26 26 0 8 0
art_table 40 415 0 0 5 0 5 5 0 8 0
art_node 32 105 0 10 1 0 1 1 0 8 0
sysvmsgpl 40 1 0 1 1 1 0 1 0 8 0
semapl 72 8 0 0 1 0 1 1 0 8 0
shmpl 112 15 0 1 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1886 0 413 93 0 93 93 0 8 0
ffsino 296 1886 0 413 114 0 114 114 0 8 0
nchpl 144 2306 0 602 64 0 64 64 0 8 0
vnodes 216 2136 0 0 119 0 119 119 0 8 0
namei 1024 7345 0 7344 2 1 1 1 0 8 0
percpumem 16 55 0 4 1 0 1 1 0 8 0
kstatmem 264 35 0 8 2 0 2 2 0 8 0
scxspl 216 8265 0 8264 4 1 3 3 1 8 2
plimitpl 152 38 0 21 1 0 1 1 0 8 0
sigapl 424 613 0 565 7 1 6 7 0 8 0
knotepl 120 79 0 0 3 0 3 3 0 8 0
kqueuepl 224 81 0 67 1 0 1 1 0 8 0
pipepl 344 152 0 125 3 0 3 3 0 8 0
fdescpl 528 597 0 565 3 0 3 3 0 8 0
filepl 160 2854 0 2615 13 0 13 13 0 8 2
lockfpl 104 133 0 128 2 0 2 2 0 8 1
lockfspl 48 65 0 60 1 0 1 1 0 8 0
sessionpl 144 35 0 26 1 0 1 1 0 8 0
pgrppl 48 45 0 28 1 0 1 1 0 8 0
ucredpl 104 403 0 385 1 0 1 1 0 8 0
zombiepl 144 566 0 565 1 0 1 1 0 8 0
processpl 1232 613 0 565 5 0 5 5 0 8 0
procpl 664 878 0 823 6 0 6 6 0 8 0
sosppl 176 6 0 6 1 0 1 1 0 8 1
sockpl 752 546 0 511 10 0 10 10 0 8 6
mcl64k 65536 3 0 0 1 0 1 1 0 8 0
mcl16k 16384 3 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 114 0 0 15 0 15 15 0 8 0
mcl2k 2048 27 0 0 4 0 4 4 0 8 1
mextrefs 64 22 0 0 1 0 1 1 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 202 0 0 13 0 13 13 0 8 0
bufpl 272 2685 0 105 172 0 172 172 0 8 0
anonpl 32 4774 0 0 39 0 39 39 0 222 0
amapchunkpl 152 13358 0 12871 22 1 21 22 0 158 1
amappl16 200 2164 0 2133 5 3 2 5 0 8 0
amappl15 192 6 0 6 2 1 1 1 0 8 1
amappl14 184 428 0 426 1 0 1 1 0 8 0
amappl13 176 132 0 118 1 0 1 1 0 8 0
amappl12 168 856 0 825 2 0 2 2 0 8 0
amappl11 160 6 0 6 2 1 1 1 0 8 1
amappl10 152 99 0 85 1 0 1 1 0 8 0
amappl9 144 271 0 271 1 1 0 1 0 8 0
amappl8 136 98 0 96 1 0 1 1 0 8 0
amappl7 128 164 0 150 1 0 1 1 0 8 0
amappl6 120 172 0 170 1 0 1 1 0 8 0
amappl5 112 126 0 116 1 0 1 1 0 8 0
amappl4 104 296 0 276 1 0 1 1 0 8 0
amappl3 96 2518 0 2399 4 0 4 4 0 8 0
amappl2 88 538 0 476 2 0 2 2 0 8 0
amappl1 80 11029 0 10401 17 1 16 16 0 8 0
amappl 88 3798 0 3634 5 0 5 5 0 92 0
uvmvnodes 80 102 0 0 3 0 3 3 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 253 0 253 1 1 0 1 0 8 0
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 17 0 1 1 0 1 1 0 8 0
uaddrrnd 24 597 0 565 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 597 0 565 1 0 1 1 0 8 0
vmmpekpl 168 6846 0 6808 2 0 2 2 0 8 0
vmmpepl 168 47042 0 45098 88 0 88 88 0 357 1
vmsppl 488 596 0 565 5 0 5 5 0 8 0
rwobjpl 80 16515 0 15416 27 2 25 26 0 8 0
pdppl 4096 1203 0 1130 101 26 75 87 0 8 2
pvpl 32 12219 0 0 102 3 99 99 0 265 0
pmappl 256 596 0 565 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 448 0 32 12 0 12 12 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x19: leave
x86_ipi_db(ffffffff85143ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 kd_curproc sys/dev/kcov.c:585 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 sys/dev/kcov.c:153
__mp_lock(ffffffff85480ac0) at __mp_lock+0x290 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff85480ac0) at __mp_lock+0x290 sys/kern/kern_lock.c:173
intr_handler(ffff8000336e0310,ffff800000171180) at intr_handler+0x113 sys/arch/amd64/amd64/intr.c:560
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
end of kernel
end trace frame: 0x7c638aa33ff0, count: 8
ddb{0}> trace
x86_ipi_db(ffffffff85143ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 kd_curproc sys/dev/kcov.c:585 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 sys/dev/kcov.c:153
__mp_lock(ffffffff85480ac0) at __mp_lock+0x290 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff85480ac0) at __mp_lock+0x290 sys/kern/kern_lock.c:173
intr_handler(ffff8000336e0310,ffff800000171180) at intr_handler+0x113 sys/arch/amd64/amd64/intr.c:560
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
end of kernel
end trace frame: 0x7c638aa33ff0, count: -7
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x17: popq %rbp
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84635b4e) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff80003b3267d8) at __asan_load4_noabort+0xa3
witness_checkorder(ffff80003b3267b8,9,0) at witness_checkorder+0x111 sys/kern/subr_witness.c:779
mtx_enter(ffff80003b3267a8) at mtx_enter+0x105 sys/kern/kern_lock.c:406
knote_processexit(ffff80003b3266a0) at knote_processexit+0x43 sys/kern/kern_event.c:2236
reaper(ffff800029895760) at reaper+0x38d sys/kern/kern_exit.c:515
end trace frame: 0x0, count: 8
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84635b4e) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff80003b3267d8) at __asan_load4_noabort+0xa3
witness_checkorder(ffff80003b3267b8,9,0) at witness_checkorder+0x111 sys/kern/subr_witness.c:779
mtx_enter(ffff80003b3267a8) at mtx_enter+0x105 sys/kern/kern_lock.c:406
knote_processexit(ffff80003b3266a0) at knote_processexit+0x43 sys/kern/kern_event.c:2236
reaper(ffff800029895760) at reaper+0x38d sys/kern/kern_exit.c:515
end trace frame: 0x0, count: -7
---
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syzbot found the following issue on:
HEAD commit: dbfd7807b1e0 kasan: debug free-quarantine for M_PINSYSCALL
git tree: https://github.com/blackgnezdo/openbsd-src.git syzbot-kasan
console output: https://syzkaller.appspot.com/x/log.txt?x=1085e0b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=85e25e37d09e1b88
dashboard link: https://syzkaller.appspot.com/bug?extid=a1a3c17d15d5df2f9ce8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/53b729308443/disk-dbfd7807.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/28cc9eea4b86/bsd-dbfd7807.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/14b18a026e2f/kernel-dbfd7807.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a1a3c1...@syzkaller.appspotmail.com
panic: Caught invalid memory access at ffff80003b3267d8 size 4 op 0
Stopped at db_enter+0x17: popq %rbp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
480708 5690 -1 0x10 0 0 syz-executor
*504592 24249 0 0x14000 0x200 1K reaper
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84635b4e) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff80003b3267d8) at __asan_load4_noabort+0xa3
witness_checkorder(ffff80003b3267b8,9,0) at witness_checkorder+0x111 sys/kern/subr_witness.c:779
mtx_enter(ffff80003b3267a8) at mtx_enter+0x105 sys/kern/kern_lock.c:406
knote_processexit(ffff80003b3266a0) at knote_processexit+0x43 sys/kern/kern_event.c:2236
reaper(ffff800029895760) at reaper+0x38d sys/kern/kern_exit.c:515
end trace frame: 0x0, count: 8
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: Caught invalid memory access at ffff80003b3267d8 size 4 op 0
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84635b4e) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff80003b3267d8) at __asan_load4_noabort+0xa3
witness_checkorder(ffff80003b3267b8,9,0) at witness_checkorder+0x111 sys/kern/subr_witness.c:779
mtx_enter(ffff80003b3267a8) at mtx_enter+0x105 sys/kern/kern_lock.c:406
knote_processexit(ffff80003b3266a0) at knote_processexit+0x43 sys/kern/kern_event.c:2236
reaper(ffff800029895760) at reaper+0x38d sys/kern/kern_exit.c:515
end trace frame: 0x0, count: -7
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800029893b10
rbx 0xffff800029893b80
rdx 0
rcx 0xffff800028fe3ff0
rax 0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xffff8000298938f8
r11 0xffffffff83f284c0 x86_bus_space_io_read_1
r12 0xffffffff84635b4e .str.23+0x9d50e
r13 0xffff800028fe4c08
r14 0xffff800028fe4e07
r15 0x1
rip 0xffffffff818a32b7 db_enter+0x17
cs 0x8
rflags 0x246
rsp 0xffff800029893b10
ss 0x10
db_enter+0x17: popq %rbp
ddb{1}> show proc
PROC (reaper) tid=504592 pid=24249 tcnt=1 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
runpri=32, usrpri=53, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045fff9f0,0xffff8000298954d8
process=0xffff800029802b50 user=0xffff800029888000, vmspace=0xffffffff854c0c80
estcpu=3, cpticks=26, pctcpu=0.2, user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
67421 34621 34004 0 2 0x10 syz-executor
67421 314828 34004 0 2 0x4000090 syz-executor
24999 350787 50568 0 2 0 syz-executor
24999 453710 50568 0 3 0x4000080 fsleep syz-executor
51485 200891 67686 0 2 0 syz-executor
51485 437832 67686 0 3 0x4000080 fsleep syz-executor
86202 366188 78698 0 2 0 syz-executor
86202 279335 78698 0 2 0x4000000 syz-executor
5690 480708 36876 -1 7 0x10 syz-executor
5690 151066 36876 -1 3 0x4000090 sbwait syz-executor
5690 145027 36876 -1 3 0x4000090 fsleep syz-executor
5690 311141 36876 -1 2 0x4000010 syz-executor
85432 420990 43789 0 3 0x100082 sbwait arp
43789 111274 66946 0 3 0x10008a sigsusp sh
66946 463573 9686 0 3 0x82 wait syz-executor
34004 417342 9686 0 2 0xc82 syz-executor
36876 348430 9686 0 3 0x82 nanoslp syz-executor
67686 212877 9686 0 3 0x82 nanoslp syz-executor
78698 273228 9686 0 2 0xc82 syz-executor
68026 292550 9686 0 3 0x2 biowait syz-executor
61937 480654 9686 0 3 0x82 wait syz-executor
50568 137388 9686 0 3 0x82 nanoslp syz-executor
9686 456423 90727 0 3 0x82 kqread syz-executor
90727 74928 10643 0 3 0x10008a sigsusp ksh
10643 240582 21529 0 3 0x98 kqread sshd-session
21529 451198 30527 0 3 0x92 kqread sshd-session
88731 355836 1 0 3 0x100083 ttyin getty
30527 151970 1 0 3 0x88 kqread sshd
31795 23979 6151 74 3 0x1100092 bpf pflogd
6151 451517 1 0 3 0x80 sbwait pflogd
43122 319903 24337 73 3 0x1100090 kqread syslogd
24337 396806 1 0 3 0x100082 sbwait syslogd
65924 454029 1 0 3 0x100080 kqread resolvd
91777 187606 75848 77 3 0x100092 kqread dhcpleased
19712 386143 75848 77 3 0x100092 kqread dhcpleased
75848 63974 1 0 3 0x80 kqread dhcpleased
60592 342809 0 0 3 0x14200 bored smr
10797 454492 0 0 2 0x14200 zerothread
36773 84309 0 0 3 0x14200 aiodoned aiodoned
52697 86013 0 0 3 0x14200 syncer update
15043 519430 0 0 3 0x14200 cleaner cleaner
*24249 504592 0 0 7 0x14200 reaper
1409 435902 0 0 3 0x14200 pgdaemon pagedaemon
24454 116845 0 0 3 0x14200 bored viomb
33035 23567 0 0 3 0x40014200 acpi0 acpi0
66564 77745 0 0 3 0x40014200 idle1
82193 227047 0 0 3 0x14200 bored softnet1
33114 200259 0 0 3 0x14200 bored softnet0
72560 26459 0 0 3 0x14200 bored systqmp
55369 81990 0 0 3 0x14200 bored systq
35940 495873 0 0 3 0x14200 tmoslp softclockmp
41026 422510 0 0 3 0x40014200 tmoslp softclock
45207 195470 0 0 3 0x40014200 idle0
1 519982 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 68026 (syz-executor) thread 0xffff800029912d08 (292550)
exclusive rrwlock inode r = 0 (0xffff800001d3c440)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xf0 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0x17e sys/kern/vfs_vops.c:527
#4 ufs_ihashins+0xda sys/ufs/ufs/ufs_ihash.c:146
#5 ffs_vget+0x2e9 sys/ufs/ffs/ffs_vfsops.c:1232
#6 ffs_inode_alloc+0x576 sys/ufs/ffs/ffs_alloc.c:393
#7 ufs_mkdir+0x25d sys/ufs/ufs/ufs_vnops.c:1112
#8 VOP_MKDIR+0x1a8 sys/kern/vfs_vops.c:394
#9 domkdirat+0x1f9 sys/kern/vfs_syscalls.c:3063
#10 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xffff800001bf1e98)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xf0 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0x17e sys/kern/vfs_vops.c:527
#4 vn_lock+0xca sys/kern/vfs_vnops.c:576
#5 vfs_lookup+0x1f7 sys/kern/vfs_lookup.c:431
#6 namei+0xe19 sys/kern/vfs_lookup.c:250
#7 domkdirat+0xe1 sys/kern/vfs_syscalls.c:3048
#8 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#9 Xsyscall+0x128
Process 24249 (reaper) thread 0xffff800029895760 (504592)
exclusive rwlock kqpsl r = 0 (0xffffffff852babb8)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320
#2 knote_processexit+0x2b sys/kern/kern_event.c:2235
#3 reaper+0x38d sys/kern/kern_exit.c:515
#4 proc_trampoline+0x10
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff854812c0)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:-1
#2 sleep_finish+0x423 sys/kern/kern_synch.c:369
#3 rw_do_enter_write+0x21f sys/kern/kern_rwlock.c:298
#4 knote_processexit+0x2b sys/kern/kern_event.c:2235
#5 reaper+0x38d sys/kern/kern_exit.c:515
#6 proc_trampoline+0x10
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11061 12251K 12534K 166960K 12389 0
pcb 17 24K 24K 166960K 64 0
rtable 225 11K 12K 166960K 333 0
pf 34 22K 38K 166960K 59 0
ifaddr 41 11K 12K 166960K 49 0
ifgroup 55 2K 2K 166960K 66 0
sysctl 4 1K 13K 166960K 11 0
counters 70 42K 43K 166960K 78 0
ioctlops 0 0K 4K 166960K 1505 0
iov 0 0K 16K 166960K 6 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1357 87K 87K 166960K 1594 0
UFS quota 1 36K 36K 166960K 1 0
UFS mount 5 44K 44K 166960K 5 0
shm 2 2K 14K 166960K 12 0
VM map 2 1K 1K 166960K 2 0
sem 10 0K 0K 166960K 10 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 292K 166960K 11964 0
file desc 18 65K 93K 166960K 295 0
sigio 1 0K 0K 166960K 70 0
proc 72 128K 177K 166960K 572 0
subproc 72 9K 9K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 20K 20K 166960K 1 0
in_multi 89 6K 6K 166960K 89 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 11 0
ISOFS mount 1 36K 36K 166960K 1 0
MSDOSFS mount 1 20K 20K 166960K 1 0
ttys 73 506K 506K 166960K 73 0
exec 0 0K 2K 166960K 391 0
fusefs mount 1 36K 36K 166960K 1 0
tdb 3 1K 1K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 241 239K 256K 166960K 4546 0
UVM aobj 17 4K 4K 166960K 18 0
pinsyscall 1068 1790K 1791K 166960K 1445 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 12 0K 1K 166960K 30 0
temp 37 9162K 9482K 166960K 6218 0
kqueue 16 43K 53K 166960K 61 0
SYN cache 2 16K 16K 166960K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 28 0 0 1 0 1 1 0 8 0
rtpcb 120 33 0 29 1 0 1 1 0 8 0
rtentry 176 105 0 1 5 0 5 5 0 8 0
unpcb 144 332 0 309 4 0 4 4 0 8 3
syncache 336 4 0 4 2 2 0 1 0 8 0
tcpcb 736 28 0 24 1 0 1 1 0 8 0
arp 136 18 0 0 1 0 1 1 0 8 0
inpcb 328 177 0 169 2 0 2 2 0 8 1
nd6 152 22 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
ppxss 1192 3 0 3 1 0 1 1 0 8 1
pffrag 232 3 0 0 1 0 1 1 0 482 0
pffrnode 88 3 0 0 1 0 1 1 0 8 0
pffrent 40 67 0 64 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 33 0 3 1 0 1 1 0 8 0
pfstkey 128 33 0 3 2 0 2 2 0 8 0
pfstate 448 33 0 3 4 0 4 4 0 8 0
pfrule 1360 23 0 18 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 414 0 0 26 0 26 26 0 8 0
art_table 40 415 0 0 5 0 5 5 0 8 0
art_node 32 105 0 10 1 0 1 1 0 8 0
sysvmsgpl 40 1 0 1 1 1 0 1 0 8 0
semapl 72 8 0 0 1 0 1 1 0 8 0
shmpl 112 15 0 1 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1886 0 413 93 0 93 93 0 8 0
ffsino 296 1886 0 413 114 0 114 114 0 8 0
nchpl 144 2306 0 602 64 0 64 64 0 8 0
vnodes 216 2136 0 0 119 0 119 119 0 8 0
namei 1024 7345 0 7344 2 1 1 1 0 8 0
percpumem 16 55 0 4 1 0 1 1 0 8 0
kstatmem 264 35 0 8 2 0 2 2 0 8 0
scxspl 216 8265 0 8264 4 1 3 3 1 8 2
plimitpl 152 38 0 21 1 0 1 1 0 8 0
sigapl 424 613 0 565 7 1 6 7 0 8 0
knotepl 120 79 0 0 3 0 3 3 0 8 0
kqueuepl 224 81 0 67 1 0 1 1 0 8 0
pipepl 344 152 0 125 3 0 3 3 0 8 0
fdescpl 528 597 0 565 3 0 3 3 0 8 0
filepl 160 2854 0 2615 13 0 13 13 0 8 2
lockfpl 104 133 0 128 2 0 2 2 0 8 1
lockfspl 48 65 0 60 1 0 1 1 0 8 0
sessionpl 144 35 0 26 1 0 1 1 0 8 0
pgrppl 48 45 0 28 1 0 1 1 0 8 0
ucredpl 104 403 0 385 1 0 1 1 0 8 0
zombiepl 144 566 0 565 1 0 1 1 0 8 0
processpl 1232 613 0 565 5 0 5 5 0 8 0
procpl 664 878 0 823 6 0 6 6 0 8 0
sosppl 176 6 0 6 1 0 1 1 0 8 1
sockpl 752 546 0 511 10 0 10 10 0 8 6
mcl64k 65536 3 0 0 1 0 1 1 0 8 0
mcl16k 16384 3 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 114 0 0 15 0 15 15 0 8 0
mcl2k 2048 27 0 0 4 0 4 4 0 8 1
mextrefs 64 22 0 0 1 0 1 1 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 202 0 0 13 0 13 13 0 8 0
bufpl 272 2685 0 105 172 0 172 172 0 8 0
anonpl 32 4774 0 0 39 0 39 39 0 222 0
amapchunkpl 152 13358 0 12871 22 1 21 22 0 158 1
amappl16 200 2164 0 2133 5 3 2 5 0 8 0
amappl15 192 6 0 6 2 1 1 1 0 8 1
amappl14 184 428 0 426 1 0 1 1 0 8 0
amappl13 176 132 0 118 1 0 1 1 0 8 0
amappl12 168 856 0 825 2 0 2 2 0 8 0
amappl11 160 6 0 6 2 1 1 1 0 8 1
amappl10 152 99 0 85 1 0 1 1 0 8 0
amappl9 144 271 0 271 1 1 0 1 0 8 0
amappl8 136 98 0 96 1 0 1 1 0 8 0
amappl7 128 164 0 150 1 0 1 1 0 8 0
amappl6 120 172 0 170 1 0 1 1 0 8 0
amappl5 112 126 0 116 1 0 1 1 0 8 0
amappl4 104 296 0 276 1 0 1 1 0 8 0
amappl3 96 2518 0 2399 4 0 4 4 0 8 0
amappl2 88 538 0 476 2 0 2 2 0 8 0
amappl1 80 11029 0 10401 17 1 16 16 0 8 0
amappl 88 3798 0 3634 5 0 5 5 0 92 0
uvmvnodes 80 102 0 0 3 0 3 3 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 253 0 253 1 1 0 1 0 8 0
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 17 0 1 1 0 1 1 0 8 0
uaddrrnd 24 597 0 565 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 597 0 565 1 0 1 1 0 8 0
vmmpekpl 168 6846 0 6808 2 0 2 2 0 8 0
vmmpepl 168 47042 0 45098 88 0 88 88 0 357 1
vmsppl 488 596 0 565 5 0 5 5 0 8 0
rwobjpl 80 16515 0 15416 27 2 25 26 0 8 0
pdppl 4096 1203 0 1130 101 26 75 87 0 8 2
pvpl 32 12219 0 0 102 3 99 99 0 265 0
pmappl 256 596 0 565 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 448 0 32 12 0 12 12 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x19: leave
x86_ipi_db(ffffffff85143ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 kd_curproc sys/dev/kcov.c:585 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 sys/dev/kcov.c:153
__mp_lock(ffffffff85480ac0) at __mp_lock+0x290 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff85480ac0) at __mp_lock+0x290 sys/kern/kern_lock.c:173
intr_handler(ffff8000336e0310,ffff800000171180) at intr_handler+0x113 sys/arch/amd64/amd64/intr.c:560
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
end of kernel
end trace frame: 0x7c638aa33ff0, count: 8
ddb{0}> trace
x86_ipi_db(ffffffff85143ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 kd_curproc sys/dev/kcov.c:585 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 sys/dev/kcov.c:153
__mp_lock(ffffffff85480ac0) at __mp_lock+0x290 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff85480ac0) at __mp_lock+0x290 sys/kern/kern_lock.c:173
intr_handler(ffff8000336e0310,ffff800000171180) at intr_handler+0x113 sys/arch/amd64/amd64/intr.c:560
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
end of kernel
end trace frame: 0x7c638aa33ff0, count: -7
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x17: popq %rbp
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84635b4e) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff80003b3267d8) at __asan_load4_noabort+0xa3
witness_checkorder(ffff80003b3267b8,9,0) at witness_checkorder+0x111 sys/kern/subr_witness.c:779
mtx_enter(ffff80003b3267a8) at mtx_enter+0x105 sys/kern/kern_lock.c:406
knote_processexit(ffff80003b3266a0) at knote_processexit+0x43 sys/kern/kern_event.c:2236
reaper(ffff800029895760) at reaper+0x38d sys/kern/kern_exit.c:515
end trace frame: 0x0, count: 8
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84635b4e) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff80003b3267d8) at __asan_load4_noabort+0xa3
witness_checkorder(ffff80003b3267b8,9,0) at witness_checkorder+0x111 sys/kern/subr_witness.c:779
mtx_enter(ffff80003b3267a8) at mtx_enter+0x105 sys/kern/kern_lock.c:406
knote_processexit(ffff80003b3266a0) at knote_processexit+0x43 sys/kern/kern_event.c:2236
reaper(ffff800029895760) at reaper+0x38d sys/kern/kern_exit.c:515
end trace frame: 0x0, count: -7
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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If the report is already addressed, let syzbot know by replying with:
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#syz undup
Greg Steuck
Jul 14, 2026, 5:23:38 AMJul 14
to syzbot, syzkaller-o...@googlegroups.com, Claudio Jeker
This exposed a pool misattribution which is already fixed (though https://syzkaller.appspot.com/bug?extid=63aa5c5f0765df8a5ed5 still has the same issue)
Fable believes this is a real problem and doesn't have a good idea how to fix it. I'm attaching its analysis.
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