witness: userret: sysctl
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syzbot
Jun 5, 2025, 11:47:44 AM6/5/25
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: c875838447ad Add back #include <sys/types.h> for pid_t
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=13cde570580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=a0c4668a7fbcd37404aa
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/49a00aefb18c/disk-c8758384.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/0d7ac353ad18/bsd-c8758384.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/241015269b76/kernel-c8758384.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a0c466...@syzkaller.appspotmail.com
witness: userret: returning with the following locks held:
shared rwlock netlock r = 0 (0xffffffff83801090)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:397
#2 sysctl_file+0x1dc4 sys/kern/kern_sysctl.c:1773
#3 kern_sysctl+0x251 sys/kern/kern_sysctl.c:526
#4
OpenBSD/amd64 (ci-openbsd-setuid-2.us-central1-b.c.syzkaller.iynternal) (tty00)s_s
login: ysctl+0x3f2
#5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#6 Xsyscall+0x128
panic: witness_warn
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
437068 87980 32767 0x10 0x4000000 0 syz-executor
*383607 97341 32767 0x10 0x4000000 1 syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8338ac8d) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_warn(2,0,ffffffff83349b2f) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline]
witness_warn(2,0,ffffffff83349b2f) at witness_warn+0x850 sys/kern/subr_witness.c:1485
userret(ffff80003c444028) at userret+0x3a4 sys/kern/kern_sig.c:2227
syscall(ffff80003c47fc10) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80003c47fc10) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe883e48ada0, count: 9
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}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: witness_warn
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8338ac8d) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_warn(2,0,ffffffff83349b2f) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline]
witness_warn(2,0,ffffffff83349b2f) at witness_warn+0x850 sys/kern/subr_witness.c:1485
userret(ffff80003c444028) at userret+0x3a4 sys/kern/kern_sig.c:2227
syscall(ffff80003c47fc10) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80003c47fc10) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe883e48ada0, count: -6
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff80003c47f940
rbx 0xffff8000299dedd7
rdx 0xffff800001466b00
rcx 0xffff80003c444028
rax 0xffff8000299ddff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xf66d559706b7a411
r11 0xd6548f8f2a325e4a
r12 0xffff8000299debd8
r13 0
r14 0
r15 0x1
rip 0xffffffff828e9eb5 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80003c47f930
ss 0
db_enter+0x25: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor) tid=383607 pid=97341 tcnt=2 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
runpri=36, usrpri=86, slppri=36, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000ffff0f80,0xffff80003c445228
process=0xffff80003c4126e0 user=0xffff80003c47a000, vmspace=0xfffffd806bf463f0
estcpu=36, cpticks=10, pctcpu=0.0, user=0, sys=10, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
76823 136430 88024 32767 2 0x10 syz-executor
87980 449340 57088 32767 2 0x10 syz-executor
87980 437068 57088 32767 7 0x4000010 syz-executor
43917 281282 73545 0 2 0x2 syz-executor
97341 399859 78262 32767 2 0x10 syz-executor
*97341 383607 78262 32767 7 0x4000010 syz-executor
7582 243600 63373 32767 3 0x90 nanoslp syz-executor
7582 310367 63373 32767 3 0x4000090 kqread syz-executor
7582 275635 63373 32767 3 0x4000090 fsleep syz-executor
89354 244588 60850 32767 3 0x90 nanoslp syz-executor
89354 118282 60850 32767 3 0x4000090 nanoslp syz-executor
89354 324521 60850 32767 3 0x4000090 fsleep syz-executor
29062 435391 0 0 3 0x14200 bored sosplice
57088 75870 36592 32767 3 0x90 nanoslp syz-executor
78262 342725 71157 32767 2 0xc90 syz-executor
65506 61013 52110 32767 3 0x90 nanoslp syz-executor
88024 182395 24589 32767 2 0xc90 syz-executor
63373 422550 27002 32767 2 0xc90 syz-executor
72266 362256 35297 32767 3 0x90 piperd syz-executor
60850 431628 45323 32767 2 0xc90 syz-executor
27002 339513 73545 0 3 0x82 wait syz-executor
71157 169586 73545 0 3 0x82 wait syz-executor
24589 451682 73545 0 3 0x82 wait syz-executor
36592 75788 73545 0 3 0x82 wait syz-executor
35297 222688 73545 0 3 0x82 wait syz-executor
52110 267178 73545 0 3 0x82 wait syz-executor
45323 246678 73545 0 3 0x82 wait syz-executor
73545 250014 80602 0 3 0x2 netlock syz-executor
80602 90145 37143 0 3 0x10008a sigsusp ksh
37143 421465 49306 0 3 0x98 kqread sshd-session
49306 21386 73142 0 3 0x92 kqread sshd-session
76929 517965 1 0 3 0x100083 ttyin getty
73142 350766 1 0 3 0x88 kqread sshd
48190 130680 10388 73 3 0x1100010 ffs_fsync syslogd
10388 447313 1 0 3 0x100082 sbwait syslogd
78383 154077 1 0 3 0x100080 kqread resolvd
42056 342741 53030 77 3 0x100092 kqread dhcpleased
94173 56851 53030 77 3 0x100092 kqread dhcpleased
53030 437149 1 0 3 0x80 kqread dhcpleased
88736 223496 0 0 3 0x14200 bored smr
30436 272322 0 0 2 0x14200 zerothread
42552 320156 0 0 3 0x14200 aiodoned aiodoned
85413 145683 0 0 3 0x14200 syncer update
87289 319331 0 0 3 0x14200 cleaner cleaner
80521 270886 0 0 3 0x14200 reaper reaper
61642 485106 0 0 3 0x14200 pgdaemon pagedaemon
55280 411661 0 0 3 0x14200 bored viomb
89421 302334 0 0 3 0x40014200 acpi0 acpi0
12625 33964 0 0 3 0x40014200 idle1
97554 305414 0 0 3 0x14200 bored softnet3
51996 484892 0 0 3 0x14200 bored softnet2
34187 486222 0 0 3 0x14200 bored softnet1
25046 28705 0 0 3 0x14200 netlock softnet0
91540 259543 0 0 3 0x14200 bored systqmp
47823 223757 0 0 3 0x14200 bored systq
22449 172601 0 0 3 0x14200 tmoslp softclockmp
30431 301656 0 0 3 0x40014200 tmoslp softclock
99906 9864 0 0 3 0x40014200 idle0
1 494181 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 97341 (syz-executor) thread 0xffff80003c444028 (383607)
shared rwlock netlock r = 0 (0xffffffff83801090)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:397
#2 sysctl_file+0x1dc4 sys/kern/kern_sysctl.c:1773
#3 kern_sysctl+0x251 sys/kern/kern_sysctl.c:526
#4 sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1
#5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#6 Xsyscall+0x128
Process 73545 (syz-executor) thread 0xffff8000ffffd9a8 (250014)
exclusive rwlock sbufsnd r = 0 (0xffff800010fde4c0)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310
#2 sblock+0xb7 sys/kern/uipc_socket2.c:536
#3 sosend+0x2e2 sys/kern/uipc_socket.c:630
#4 dofilewritev+0x23c sys/kern/sys_generic.c:380
#5 sys_write+0xa2 sys/kern/sys_generic.c:300
#6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#7 Xsyscall+0x128
Process 48190 (syslogd) thread 0xffff8000ffff3c40 (130680)
exclusive rrwlock inode r = 0 (0xfffffd806eb3bac8)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605
#3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 sys_fsync+0x152 sys/kern/vfs_syscalls.c:2936
#6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579
#7 Xsyscall+0x128
Process 25046 (softnet0) thread 0xffff8000ffffe290 (28705)
shared rwlock softnet0 r = 0 (0xffff80000002c078)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10185 10952K 10966K 166960K 11265 0
pcb 17 12K 12K 166960K 17 0
rtable 212 6K 7K 166960K 366 0
pf 29 16K 16K 166960K 31 0
ifaddr 38 6K 7K 166960K 44 0
ifgroup 46 2K 2K 166960K 50 0
sysctl 1 1K 9K 166960K 6 0
counters 66 36K 36K 166960K 68 0
ioctlops 0 0K 2K 166960K 33 0
iov 0 0K 16K 166960K 10 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1335 84K 84K 166960K 1381 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 4 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 17 0
dirhash 12 2K 2K 166960K 18 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 23 85K 125K 166960K 312 0
sigio 0 0K 0K 166960K 3 0
proc 58 79K 115K 166960K 495 0
subproc 72 4K 4K 166960K 81 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 3 0K 0K 166960K 47 0
in_multi 91 6K 7K 166960K 109 0
ether_multi 1 0K 0K 166960K 3 0
mrt 1 0K 0K 166960K 1 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 55 254K 254K 166960K 55 0
exec 0 0K 1K 166960K 407 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 239 176K 205K 166960K 4430 0
UVM aobj 14 2K 2K 166960K 14 0
pinsyscall 44 88K 110K 166960K 1344 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 7 0
NDP 10 0K 2K 166960K 27 0
temp 40 8687K 8751K 166960K 4550 0
kqueue 15 24K 36K 166960K 70 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 26 0 0 1 0 1 1 0 8 0
rtpcb 120 55 0 51 1 0 1 1 0 8 0
rtentry 176 113 0 14 6 0 6 6 0 8 1
unpcb 144 169 0 153 2 0 2 2 0 8 1
syncache 336 6 0 6 1 0 1 1 0 8 1
tcpqe 32 1 0 1 1 0 1 1 0 8 1
tcpcb 808 74 0 63 2 0 2 2 0 8 0
arp 128 18 0 2 1 0 1 1 0 8 0
ipq 40 1 0 0 1 0 1 1 0 8 0
ipqe 40 4 0 3 1 0 1 1 0 8 0
inpcb 328 243 0 227 4 0 4 4 0 8 2
nd6 144 26 0 5 1 0 1 1 0 8 0
kcovpl 48 8 0 1 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 457 0 49 29 0 29 29 0 8 2
art_table 32 458 0 49 4 0 4 4 0 8 0
art_node 16 112 0 22 1 0 1 1 0 8 0
sysvmsgpl 40 4 0 3 1 0 1 1 0 8 0
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 112 14 0 4 1 0 1 1 0 8 0
shmpl 112 11 0 0 1 0 1 1 0 8 0
dirhash 1024 21 0 4 3 0 3 3 0 8 0
dino2pl 256 1805 0 296 95 0 95 95 0 8 0
ffsino 288 1805 0 296 108 0 108 108 0 8 0
nchpl 144 2262 0 584 63 0 63 63 0 8 0
uvmvnodes 80 1895 0 0 39 0 39 39 0 8 0
vnodes 216 1895 0 0 106 0 106 106 0 8 0
namei 1024 6781 0 6781 1 0 1 1 0 8 1
percpumem 16 49 0 1 1 0 1 1 0 8 0
kstatmem 264 24 0 2 2 0 2 2 0 8 0
scxspl 216 7292 0 7291 3 2 1 2 1 8 0
plimitpl 152 56 0 33 2 0 2 2 0 8 1
sigapl 424 592 0 538 8 0 8 8 0 8 1
knotepl 120 310 0 0 10 0 10 10 0 8 0
kqueuepl 224 84 0 72 2 0 2 2 0 8 1
pipepl 336 122 0 94 3 0 3 3 0 8 0
fdescpl 520 573 0 538 4 0 4 4 0 8 0
filepl 160 2387 0 2168 11 0 11 11 0 8 1
lockfpl 104 42 0 39 1 0 1 1 0 8 0
lockfspl 48 20 0 17 1 0 1 1 0 8 0
sessionpl 144 23 0 8 1 0 1 1 0 8 0
pgrppl 48 35 0 12 1 0 1 1 0 8 0
ucredpl 104 291 0 273 1 0 1 1 0 8 0
zombiepl 144 539 0 538 1 0 1 1 0 8 0
processpl 1240 592 0 538 5 0 5 5 0 8 0
procpl 656 886 0 826 7 0 7 7 0 8 1
sosppl 168 4 0 4 1 0 1 1 0 8 1
sockpl 728 471 0 432 6 0 6 6 0 8 1
mcl64k 65536 2 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 126 0 0 16 0 16 16 0 8 0
mcl2k 2048 17 0 0 3 0 3 3 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 251 0 0 16 0 16 16 0 8 0
bufpl 280 2630 0 116 180 0 180 180 0 8 0
anonpl 32 7364 0 0 60 0 60 60 0 246 0
amapchunkpl 152 13532 0 13033 38 0 38 38 0 158 13
amappl16 200 2198 0 2177 14 3 11 14 0 8 8
amappl15 192 35 0 35 1 1 0 1 0 8 0
amappl14 184 108 0 98 1 0 1 1 0 8 0
amappl13 176 7 0 7 1 1 0 1 0 8 0
amappl12 168 1180 0 1146 3 1 2 3 0 8 0
amappl11 160 46 0 36 1 0 1 1 0 8 0
amappl10 152 2 0 2 1 1 0 1 0 8 0
amappl9 144 274 0 274 1 1 0 1 0 8 0
amappl8 136 20 0 19 1 0 1 1 0 8 0
amappl7 128 119 0 109 1 0 1 1 0 8 0
amappl6 120 174 0 171 1 0 1 1 0 8 0
amappl5 112 116 0 110 1 0 1 1 0 8 0
amappl4 104 292 0 275 1 0 1 1 0 8 0
amappl3 96 2325 0 2210 4 0 4 4 0 8 0
amappl2 88 621 0 567 2 0 2 2 0 8 0
amappl1 80 8901 0 8339 14 0 14 14 0 8 0
amappl 88 3739 0 3567 5 0 5 5 0 92 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 13 0 0 1 0 1 1 0 8 0
uaddrrnd 24 573 0 538 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 573 0 538 1 0 1 1 0 8 0
vmmpekpl 168 6271 0 6235 2 0 2 2 0 8 0
vmmpepl 168 42845 0 40844 103 0 103 103 0 357 7
vmsppl 480 572 0 538 7 1 6 6 0 8 0
rwobjpl 72 16245 0 13517 52 0 52 52 0 8 0
pdppl 4096 1153 0 1076 115 30 85 97 0 8 8
pvpl 32 14904 0 0 121 0 121 121 0 265 0
pmappl 256 572 0 538 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 402 0 33 11 0 11 11 0 8 0
ddb{1}> machine ddbcpu 0
---
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.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: c875838447ad Add back #include <sys/types.h> for pid_t
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=13cde570580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=a0c4668a7fbcd37404aa
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/49a00aefb18c/disk-c8758384.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/0d7ac353ad18/bsd-c8758384.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/241015269b76/kernel-c8758384.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a0c466...@syzkaller.appspotmail.com
witness: userret: returning with the following locks held:
shared rwlock netlock r = 0 (0xffffffff83801090)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:397
#2 sysctl_file+0x1dc4 sys/kern/kern_sysctl.c:1773
#3 kern_sysctl+0x251 sys/kern/kern_sysctl.c:526
#4
OpenBSD/amd64 (ci-openbsd-setuid-2.us-central1-b.c.syzkaller.iynternal) (tty00)s_s
login: ysctl+0x3f2
#5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#6 Xsyscall+0x128
panic: witness_warn
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
437068 87980 32767 0x10 0x4000000 0 syz-executor
*383607 97341 32767 0x10 0x4000000 1 syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8338ac8d) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_warn(2,0,ffffffff83349b2f) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline]
witness_warn(2,0,ffffffff83349b2f) at witness_warn+0x850 sys/kern/subr_witness.c:1485
userret(ffff80003c444028) at userret+0x3a4 sys/kern/kern_sig.c:2227
syscall(ffff80003c47fc10) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80003c47fc10) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe883e48ada0, count: 9
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}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: witness_warn
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8338ac8d) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_warn(2,0,ffffffff83349b2f) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline]
witness_warn(2,0,ffffffff83349b2f) at witness_warn+0x850 sys/kern/subr_witness.c:1485
userret(ffff80003c444028) at userret+0x3a4 sys/kern/kern_sig.c:2227
syscall(ffff80003c47fc10) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80003c47fc10) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe883e48ada0, count: -6
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff80003c47f940
rbx 0xffff8000299dedd7
rdx 0xffff800001466b00
rcx 0xffff80003c444028
rax 0xffff8000299ddff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xf66d559706b7a411
r11 0xd6548f8f2a325e4a
r12 0xffff8000299debd8
r13 0
r14 0
r15 0x1
rip 0xffffffff828e9eb5 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80003c47f930
ss 0
db_enter+0x25: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor) tid=383607 pid=97341 tcnt=2 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
runpri=36, usrpri=86, slppri=36, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000ffff0f80,0xffff80003c445228
process=0xffff80003c4126e0 user=0xffff80003c47a000, vmspace=0xfffffd806bf463f0
estcpu=36, cpticks=10, pctcpu=0.0, user=0, sys=10, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
76823 136430 88024 32767 2 0x10 syz-executor
87980 449340 57088 32767 2 0x10 syz-executor
87980 437068 57088 32767 7 0x4000010 syz-executor
43917 281282 73545 0 2 0x2 syz-executor
97341 399859 78262 32767 2 0x10 syz-executor
*97341 383607 78262 32767 7 0x4000010 syz-executor
7582 243600 63373 32767 3 0x90 nanoslp syz-executor
7582 310367 63373 32767 3 0x4000090 kqread syz-executor
7582 275635 63373 32767 3 0x4000090 fsleep syz-executor
89354 244588 60850 32767 3 0x90 nanoslp syz-executor
89354 118282 60850 32767 3 0x4000090 nanoslp syz-executor
89354 324521 60850 32767 3 0x4000090 fsleep syz-executor
29062 435391 0 0 3 0x14200 bored sosplice
57088 75870 36592 32767 3 0x90 nanoslp syz-executor
78262 342725 71157 32767 2 0xc90 syz-executor
65506 61013 52110 32767 3 0x90 nanoslp syz-executor
88024 182395 24589 32767 2 0xc90 syz-executor
63373 422550 27002 32767 2 0xc90 syz-executor
72266 362256 35297 32767 3 0x90 piperd syz-executor
60850 431628 45323 32767 2 0xc90 syz-executor
27002 339513 73545 0 3 0x82 wait syz-executor
71157 169586 73545 0 3 0x82 wait syz-executor
24589 451682 73545 0 3 0x82 wait syz-executor
36592 75788 73545 0 3 0x82 wait syz-executor
35297 222688 73545 0 3 0x82 wait syz-executor
52110 267178 73545 0 3 0x82 wait syz-executor
45323 246678 73545 0 3 0x82 wait syz-executor
73545 250014 80602 0 3 0x2 netlock syz-executor
80602 90145 37143 0 3 0x10008a sigsusp ksh
37143 421465 49306 0 3 0x98 kqread sshd-session
49306 21386 73142 0 3 0x92 kqread sshd-session
76929 517965 1 0 3 0x100083 ttyin getty
73142 350766 1 0 3 0x88 kqread sshd
48190 130680 10388 73 3 0x1100010 ffs_fsync syslogd
10388 447313 1 0 3 0x100082 sbwait syslogd
78383 154077 1 0 3 0x100080 kqread resolvd
42056 342741 53030 77 3 0x100092 kqread dhcpleased
94173 56851 53030 77 3 0x100092 kqread dhcpleased
53030 437149 1 0 3 0x80 kqread dhcpleased
88736 223496 0 0 3 0x14200 bored smr
30436 272322 0 0 2 0x14200 zerothread
42552 320156 0 0 3 0x14200 aiodoned aiodoned
85413 145683 0 0 3 0x14200 syncer update
87289 319331 0 0 3 0x14200 cleaner cleaner
80521 270886 0 0 3 0x14200 reaper reaper
61642 485106 0 0 3 0x14200 pgdaemon pagedaemon
55280 411661 0 0 3 0x14200 bored viomb
89421 302334 0 0 3 0x40014200 acpi0 acpi0
12625 33964 0 0 3 0x40014200 idle1
97554 305414 0 0 3 0x14200 bored softnet3
51996 484892 0 0 3 0x14200 bored softnet2
34187 486222 0 0 3 0x14200 bored softnet1
25046 28705 0 0 3 0x14200 netlock softnet0
91540 259543 0 0 3 0x14200 bored systqmp
47823 223757 0 0 3 0x14200 bored systq
22449 172601 0 0 3 0x14200 tmoslp softclockmp
30431 301656 0 0 3 0x40014200 tmoslp softclock
99906 9864 0 0 3 0x40014200 idle0
1 494181 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 97341 (syz-executor) thread 0xffff80003c444028 (383607)
shared rwlock netlock r = 0 (0xffffffff83801090)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:397
#2 sysctl_file+0x1dc4 sys/kern/kern_sysctl.c:1773
#3 kern_sysctl+0x251 sys/kern/kern_sysctl.c:526
#4 sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1
#5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#6 Xsyscall+0x128
Process 73545 (syz-executor) thread 0xffff8000ffffd9a8 (250014)
exclusive rwlock sbufsnd r = 0 (0xffff800010fde4c0)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310
#2 sblock+0xb7 sys/kern/uipc_socket2.c:536
#3 sosend+0x2e2 sys/kern/uipc_socket.c:630
#4 dofilewritev+0x23c sys/kern/sys_generic.c:380
#5 sys_write+0xa2 sys/kern/sys_generic.c:300
#6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#7 Xsyscall+0x128
Process 48190 (syslogd) thread 0xffff8000ffff3c40 (130680)
exclusive rrwlock inode r = 0 (0xfffffd806eb3bac8)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605
#3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 sys_fsync+0x152 sys/kern/vfs_syscalls.c:2936
#6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579
#7 Xsyscall+0x128
Process 25046 (softnet0) thread 0xffff8000ffffe290 (28705)
shared rwlock softnet0 r = 0 (0xffff80000002c078)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10185 10952K 10966K 166960K 11265 0
pcb 17 12K 12K 166960K 17 0
rtable 212 6K 7K 166960K 366 0
pf 29 16K 16K 166960K 31 0
ifaddr 38 6K 7K 166960K 44 0
ifgroup 46 2K 2K 166960K 50 0
sysctl 1 1K 9K 166960K 6 0
counters 66 36K 36K 166960K 68 0
ioctlops 0 0K 2K 166960K 33 0
iov 0 0K 16K 166960K 10 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1335 84K 84K 166960K 1381 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 4 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 17 0
dirhash 12 2K 2K 166960K 18 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 23 85K 125K 166960K 312 0
sigio 0 0K 0K 166960K 3 0
proc 58 79K 115K 166960K 495 0
subproc 72 4K 4K 166960K 81 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 3 0K 0K 166960K 47 0
in_multi 91 6K 7K 166960K 109 0
ether_multi 1 0K 0K 166960K 3 0
mrt 1 0K 0K 166960K 1 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 55 254K 254K 166960K 55 0
exec 0 0K 1K 166960K 407 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 239 176K 205K 166960K 4430 0
UVM aobj 14 2K 2K 166960K 14 0
pinsyscall 44 88K 110K 166960K 1344 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 7 0
NDP 10 0K 2K 166960K 27 0
temp 40 8687K 8751K 166960K 4550 0
kqueue 15 24K 36K 166960K 70 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 26 0 0 1 0 1 1 0 8 0
rtpcb 120 55 0 51 1 0 1 1 0 8 0
rtentry 176 113 0 14 6 0 6 6 0 8 1
unpcb 144 169 0 153 2 0 2 2 0 8 1
syncache 336 6 0 6 1 0 1 1 0 8 1
tcpqe 32 1 0 1 1 0 1 1 0 8 1
tcpcb 808 74 0 63 2 0 2 2 0 8 0
arp 128 18 0 2 1 0 1 1 0 8 0
ipq 40 1 0 0 1 0 1 1 0 8 0
ipqe 40 4 0 3 1 0 1 1 0 8 0
inpcb 328 243 0 227 4 0 4 4 0 8 2
nd6 144 26 0 5 1 0 1 1 0 8 0
kcovpl 48 8 0 1 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 457 0 49 29 0 29 29 0 8 2
art_table 32 458 0 49 4 0 4 4 0 8 0
art_node 16 112 0 22 1 0 1 1 0 8 0
sysvmsgpl 40 4 0 3 1 0 1 1 0 8 0
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 112 14 0 4 1 0 1 1 0 8 0
shmpl 112 11 0 0 1 0 1 1 0 8 0
dirhash 1024 21 0 4 3 0 3 3 0 8 0
dino2pl 256 1805 0 296 95 0 95 95 0 8 0
ffsino 288 1805 0 296 108 0 108 108 0 8 0
nchpl 144 2262 0 584 63 0 63 63 0 8 0
uvmvnodes 80 1895 0 0 39 0 39 39 0 8 0
vnodes 216 1895 0 0 106 0 106 106 0 8 0
namei 1024 6781 0 6781 1 0 1 1 0 8 1
percpumem 16 49 0 1 1 0 1 1 0 8 0
kstatmem 264 24 0 2 2 0 2 2 0 8 0
scxspl 216 7292 0 7291 3 2 1 2 1 8 0
plimitpl 152 56 0 33 2 0 2 2 0 8 1
sigapl 424 592 0 538 8 0 8 8 0 8 1
knotepl 120 310 0 0 10 0 10 10 0 8 0
kqueuepl 224 84 0 72 2 0 2 2 0 8 1
pipepl 336 122 0 94 3 0 3 3 0 8 0
fdescpl 520 573 0 538 4 0 4 4 0 8 0
filepl 160 2387 0 2168 11 0 11 11 0 8 1
lockfpl 104 42 0 39 1 0 1 1 0 8 0
lockfspl 48 20 0 17 1 0 1 1 0 8 0
sessionpl 144 23 0 8 1 0 1 1 0 8 0
pgrppl 48 35 0 12 1 0 1 1 0 8 0
ucredpl 104 291 0 273 1 0 1 1 0 8 0
zombiepl 144 539 0 538 1 0 1 1 0 8 0
processpl 1240 592 0 538 5 0 5 5 0 8 0
procpl 656 886 0 826 7 0 7 7 0 8 1
sosppl 168 4 0 4 1 0 1 1 0 8 1
sockpl 728 471 0 432 6 0 6 6 0 8 1
mcl64k 65536 2 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 126 0 0 16 0 16 16 0 8 0
mcl2k 2048 17 0 0 3 0 3 3 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 251 0 0 16 0 16 16 0 8 0
bufpl 280 2630 0 116 180 0 180 180 0 8 0
anonpl 32 7364 0 0 60 0 60 60 0 246 0
amapchunkpl 152 13532 0 13033 38 0 38 38 0 158 13
amappl16 200 2198 0 2177 14 3 11 14 0 8 8
amappl15 192 35 0 35 1 1 0 1 0 8 0
amappl14 184 108 0 98 1 0 1 1 0 8 0
amappl13 176 7 0 7 1 1 0 1 0 8 0
amappl12 168 1180 0 1146 3 1 2 3 0 8 0
amappl11 160 46 0 36 1 0 1 1 0 8 0
amappl10 152 2 0 2 1 1 0 1 0 8 0
amappl9 144 274 0 274 1 1 0 1 0 8 0
amappl8 136 20 0 19 1 0 1 1 0 8 0
amappl7 128 119 0 109 1 0 1 1 0 8 0
amappl6 120 174 0 171 1 0 1 1 0 8 0
amappl5 112 116 0 110 1 0 1 1 0 8 0
amappl4 104 292 0 275 1 0 1 1 0 8 0
amappl3 96 2325 0 2210 4 0 4 4 0 8 0
amappl2 88 621 0 567 2 0 2 2 0 8 0
amappl1 80 8901 0 8339 14 0 14 14 0 8 0
amappl 88 3739 0 3567 5 0 5 5 0 92 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 13 0 0 1 0 1 1 0 8 0
uaddrrnd 24 573 0 538 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 573 0 538 1 0 1 1 0 8 0
vmmpekpl 168 6271 0 6235 2 0 2 2 0 8 0
vmmpepl 168 42845 0 40844 103 0 103 103 0 357 7
vmsppl 480 572 0 538 7 1 6 6 0 8 0
rwobjpl 72 16245 0 13517 52 0 52 52 0 8 0
pdppl 4096 1153 0 1076 115 30 85 97 0 8 8
pvpl 32 14904 0 0 121 0 121 121 0 265 0
pmappl 256 572 0 538 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 402 0 33 11 0 11 11 0 8 0
ddb{1}> machine ddbcpu 0
---
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