Hello,
syzbot found the following crash on:
HEAD commit: 3c025a5e debug-> pkg-debug defines It's only used for debu..
git tree: openbsd
console output:
https://syzkaller.appspot.com/x/log.txt?x=110805e1e00000
kernel config:
https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link:
https://syzkaller.appspot.com/bug?extid=8c174edc00da365121d7
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by:
syzbot+8c174e...@syzkaller.appspotmail.com
panic: knote_enqueue:1283: kq=0xfffffd80722538f0 kn=0xfffffd806ebfb2a0
knote !QUEUED
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*502635 27741 32767 0x10 0 0 syz-executor.0
464141 7551 32767 0x10 0 1 syz-executor.0
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff8220d3c6) at panic+0x15c sys/kern/subr_prf.c:207
kqueue_do_check(fffffd80722538f0,ffffffff82250c20,503) at
kqueue_do_check+0x232 sys/kern/kern_event.c:597
knote_enqueue(fffffd806ebfb2a0) at knote_enqueue+0x80
sys/kern/kern_event.c:1284
filt_timerexpire(fffffd806ebfb2a0) at filt_timerexpire+0x5f
sys/kern/kern_event.c:373
timeout_run(ffff8000009ff180) at timeout_run+0xc4 timeout_sync_leave
sys/kern/kern_timeout.c:183 [inline]
timeout_run(ffff8000009ff180) at timeout_run+0xc4
sys/kern/kern_timeout.c:489
softclock(0) at softclock+0x175 sys/kern/kern_timeout.c:532
softintr_dispatch(0) at softintr_dispatch+0x107
sys/arch/amd64/amd64/softintr.c:89
Xsoftclock() at Xsoftclock+0x1f
__sanitizer_cov_trace_const_cmp4(0,8853) at
__sanitizer_cov_trace_const_cmp4+0x1f
nanouptime(ffff800024d9f088) at nanouptime+0x7f binuptime
sys/kern/kern_tc.c:190 [inline]
nanouptime(ffff800024d9f088) at nanouptime+0x7f sys/kern/kern_tc.c:199
clock_gettime(ffff800020ac8508,3,ffff800024d9f088) at clock_gettime+0x8b
sys/kern/kern_time.c:124
sys_clock_gettime(ffff800020ac8508,ffff800024d9f0f0,ffff800024d9f140) at
sys_clock_gettime+0x4c sys/kern/kern_time.c:166
syscall(ffff800024d9f1c0) at syscall+0x4a4 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800024d9f1c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
end trace frame: 0xffff800024d9f240, count: 0
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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
knote_enqueue:1283: kq=0xfffffd80722538f0 kn=0xfffffd806ebfb2a0
knote !QUEUED
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff8220d3c6) at panic+0x15c sys/kern/subr_prf.c:207
kqueue_do_check(fffffd80722538f0,ffffffff82250c20,503) at
kqueue_do_check+0x232 sys/kern/kern_event.c:597
knote_enqueue(fffffd806ebfb2a0) at knote_enqueue+0x80
sys/kern/kern_event.c:1284
filt_timerexpire(fffffd806ebfb2a0) at filt_timerexpire+0x5f
sys/kern/kern_event.c:373
timeout_run(ffff8000009ff180) at timeout_run+0xc4 timeout_sync_leave
sys/kern/kern_timeout.c:183 [inline]
timeout_run(ffff8000009ff180) at timeout_run+0xc4
sys/kern/kern_timeout.c:489
softclock(0) at softclock+0x175 sys/kern/kern_timeout.c:532
softintr_dispatch(0) at softintr_dispatch+0x107
sys/arch/amd64/amd64/softintr.c:89
Xsoftclock() at Xsoftclock+0x1f
__sanitizer_cov_trace_const_cmp4(0,8853) at
__sanitizer_cov_trace_const_cmp4+0x1f
nanouptime(ffff800024d9f088) at nanouptime+0x7f binuptime
sys/kern/kern_tc.c:190 [inline]
nanouptime(ffff800024d9f088) at nanouptime+0x7f sys/kern/kern_tc.c:199
clock_gettime(ffff800020ac8508,3,ffff800024d9f088) at clock_gettime+0x8b
sys/kern/kern_time.c:124
sys_clock_gettime(ffff800020ac8508,ffff800024d9f0f0,ffff800024d9f140) at
sys_clock_gettime+0x4c sys/kern/kern_time.c:166
syscall(ffff800024d9f1c0) at syscall+0x4a4 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800024d9f1c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe6ce0, count: -15
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff800024d9ebe0
rbx 0xffff800024d9ec90
rdx 0xffffffff82469ff0 cpu_info_full_primary+0x1ff0
rcx 0xffffffff82469ff0 cpu_info_full_primary+0x1ff0
rax 0xffffffff82469ff0 cpu_info_full_primary+0x1ff0
r8 0xffffffff820fb0ef kprintf+0x16f
r9 0x1
r10 0x25
r11 0x7e0c9c7fdeb77e51
r12 0x3000000008
r13 0xffff800024d9ebf0
r14 0x100
r15 0x1
rip 0xffffffff818bce58 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800024d9ebd0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.0) pid=502635 stat=onproc
flags process=10<SUGID> proc=0
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020ac93d8,0xffff800020ac8a08
process=0xffff800020aa2710 user=0xffff800024d9a000,
vmspace=0xfffffd806e8b3b88
estcpu=36, cpticks=5, pctcpu=0.0
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*27741 502635 7551 32767 7 0x10 syz-executor.0
27741 136813 7551 32767 3 0x4000090 fsleep syz-executor.0
27741 288984 7551 32767 3 0x4000090 fsleep syz-executor.0
27741 353393 7551 32767 3 0x4000090 fsleep syz-executor.0
27741 211908 7551 32767 3 0x4000090 kqread syz-executor.0
31230 220658 7869 32767 2 0x490 syz-executor.1
7869 111038 66529 0 3 0x82 wait syz-executor.1
7551 464141 28683 32767 7 0x10 syz-executor.0
28683 500677 66529 0 3 0x82 wait syz-executor.0
5155 434769 0 0 3 0x14200 bored sosplice
66529 86762 37287 0 3 0x82 thrsleep syz-fuzzer
66529 268323 37287 0 3 0x4000082 thrsleep syz-fuzzer
66529 175540 37287 0 3 0x4000082 kqread syz-fuzzer
66529 305016 37287 0 3 0x4000082 thrsleep syz-fuzzer
66529 306811 37287 0 3 0x4000082 thrsleep syz-fuzzer
66529 49786 37287 0 3 0x4000082 thrsleep syz-fuzzer
66529 98383 37287 0 3 0x4000082 thrsleep syz-fuzzer
66529 465903 37287 0 3 0x4000082 thrsleep syz-fuzzer
66529 151715 37287 0 3 0x4000082 thrsleep syz-fuzzer
66529 519420 37287 0 3 0x4000082 thrsleep syz-fuzzer
37287 513607 44859 0 3 0x10008a pause ksh
44859 477769 48123 0 3 0x92 select sshd
97605 476018 1 0 3 0x100083 ttyin getty
48123 197620 1 0 3 0x80 select sshd
21413 20722 21631 73 3 0x100090 kqread syslogd
21631 507713 1 0 3 0x100082 netio syslogd
8203 341379 1 77 3 0x100090 poll dhclient
50376 172766 1 0 3 0x80 poll dhclient
43961 382529 0 0 3 0x14200 pgzero zerothread
94792 194095 0 0 3 0x14200 aiodoned aiodoned
20366 85161 0 0 3 0x14200 syncer update
46144 240514 0 0 3 0x14200 cleaner cleaner
38471 353084 0 0 3 0x14200 reaper reaper
15697 322083 0 0 3 0x14200 pgdaemon pagedaemon
96811 366351 0 0 3 0x14200 bored crynlk
72941 198966 0 0 3 0x14200 bored crypto
49928 195521 0 0 3 0x40014200 acpi0 acpi0
65884 103846 0 0 3 0x40014200 idle1
55709 198172 0 0 3 0x14200 bored softnet
65440 34198 0 0 3 0x14200 bored systqmp
16525 416082 0 0 3 0x14200 bored systq
35278 404039 0 0 3 0x40014200 bored softclock
44342 95836 0 0 3 0x40014200 idle0
93227 325722 0 0 3 0x14200 bored smr
1 66237 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
shared mutex timeout r = 0 (0xffffffff824c6a50)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 timeout_run+0xb9 sys/kern/kern_timeout.c:488
#2 softclock+0x175 sys/kern/kern_timeout.c:532
#3 softintr_dispatch+0x107 sys/arch/amd64/amd64/softintr.c:89
#4 Xsoftclock+0x1f
#5 __sanitizer_cov_trace_const_cmp4+0x1f
#6 nanouptime+0x7f binuptime sys/kern/kern_tc.c:190 [inline]
#6 nanouptime+0x7f sys/kern/kern_tc.c:199
#7 clock_gettime+0x8b sys/kern/kern_time.c:124
#8 sys_clock_gettime+0x4c sys/kern/kern_time.c:166
#9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#10 Xsyscall+0x128
Process 27741 (syz-executor.0) thread 0xffff800020ac8508 (502635)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82659980)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:89
#2 Xsoftclock+0x1f
#3 __sanitizer_cov_trace_const_cmp4+0x1f
#4 nanouptime+0x7f binuptime sys/kern/kern_tc.c:190 [inline]
#4 nanouptime+0x7f sys/kern/kern_tc.c:199
#5 clock_gettime+0x8b sys/kern/kern_time.c:124
#6 sys_clock_gettime+0x4c sys/kern/kern_time.c:166
#7 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#7 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#8 Xsyscall+0x128
shared mutex timeout r = 0 (0xffffffff824c6a50)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 timeout_run+0xb9 sys/kern/kern_timeout.c:488
#2 softclock+0x175 sys/kern/kern_timeout.c:532
#3 softintr_dispatch+0x107 sys/arch/amd64/amd64/softintr.c:89
#4 Xsoftclock+0x1f
#5 __sanitizer_cov_trace_const_cmp4+0x1f
#6 nanouptime+0x7f binuptime sys/kern/kern_tc.c:190 [inline]
#6 nanouptime+0x7f sys/kern/kern_tc.c:199
#7 clock_gettime+0x8b sys/kern/kern_time.c:124
#8 sys_clock_gettime+0x4c sys/kern/kern_time.c:166
#9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#10 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9483 6334K 6334K 78643K 11003 0
pcb 13 10K 12K 78643K 15 0
rtable 107 3K 4K 78643K 4659 0
ifaddr 39 11K 12K 78643K 807 0
counters 39 33K 33K 78643K 39 0
ioctlops 0 0K 2K 78643K 196 0
iov 0 0K 32K 78643K 813 0
mount 1 1K 1K 78643K 1 0
vnodes 1215 76K 76K 78643K 3755 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 55 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 1423 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 7 21K 33K 78643K 4706 0
sigio 0 0K 0K 78643K 123 0
proc 48 50K 83K 78643K 5236 0
subproc 34 2K 2K 78643K 1853 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 2 0K 1K 78643K 1161 0
in_multi 33 2K 2K 78643K 1306 0
ether_multi 1 0K 0K 78643K 11 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 139 625K 625K 78643K 139 0
exec 0 0K 1K 78643K 2097 0
pagedep 1 8K 8K 78643K 1 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 7 26K 26K 78643K 7 0
UVM amap 168 25K 41K 78643K 19191 0
UVM aobj 130 4K 4K 78643K 140 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 385 0
NDP 7 0K 0K 78643K 330 0
temp 102 3021K 3117K 78643K 24571 0
kqueue 8 7K 34K 78643K 950 0
SYN cache 2 16K 16K 78643K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg
Idle
arp 64 229 0 222 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtpcb 80 724 0 720 1 0 1 1 0
8 0
rtentry 112 1124 0 1079 2 0 2 2 0
8 0
unpcb 120 4370 0 4358 23 22 1 3 0
8 0
syncache 264 74 0 74 24 24 0 1 0
8 0
sackhl 24 3 0 3 2 2 0 1 0
8 0
tcpqe 32 48 0 48 20 20 0 1 0
8 0
tcpcb 544 2684 0 2676 33 19 14 14 0 8
13
ipq 40 35 0 35 16 15 1 1 0
8 1
ipqe 40 1028 0 1028 16 15 1 1 0
8 1
inpcb 280 5956 0 5943 43 34 9 9 0
8 7
nd6 48 218 0 214 1 0 1 1 0
8 0
art_heap8 4096 1 0 0 1 0 1 1 0
8 0
art_heap4 256 4957 0 4739 14 0 14 14 0
8 0
art_table 32 4958 0 4739 2 0 2 2 0
8 0
art_node 16 1123 0 1082 1 0 1 1 0
8 0
sysvmsgpl 40 70 0 59 1 0 1 1 0
8 0
semupl 112 4 0 4 2 2 0 1 0
8 0
semapl 112 1419 0 1409 1 0 1 1 0
8 0
shmpl 112 138 0 10 4 0 4 4 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 6222 0 4813 46 0 46 46 0
8 0
ffsino 272 6222 0 4813 95 0 95 95 0
8 0
nchpl 144 12253 0 10651 60 0 60 60 0
8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0
8 0
vnodes 208 5926 0 0 312 0 312 312 0
8 0
namei 1024 60729 0 60729 4 3 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scxspl 192 41879 0 41879 51 49 2 7 0
8 2
plimitpl 152 824 0 815 1 0 1 1 0
8 0
sigapl 432 4556 0 4541 5 3 2 3 0
8 0
futexpl 56 87450 0 87447 3 2 1 1 0
8 0
knotepl 112 2936 0 2914 13 10 3 3 0
8 2
kqueuepl 104 3240 0 3234 6 2 4 4 0
8 3
pipelkpl 48 1810 0 1798 1 0 1 1 0
8 0
pipepl 120 3620 0 3597 24 23 1 2 0
8 0
fdescpl 496 4557 0 4541 3 0 3 3 0
8 0
filepl 152 45772 0 45657 89 78 11 13 0
8 6
lockfpl 104 1828 0 1827 1 0 1 1 0
8 0
lockfspl 48 446 0 445 1 0 1 1 0
8 0
sessionpl 112 124 0 114 1 0 1 1 0
8 0
pgrppl 48 387 0 377 1 0 1 1 0
8 0
ucredpl 96 12424 0 12415 1 0 1 1 0
8 0
zombiepl 144 4541 0 4540 4 3 1 1 0
8 0
processpl 896 4573 0 4540 4 0 4 4 0
8 0
procpl 632 13577 0 13531 7 2 5 5 0
8 1
srpgc 64 214 0 214 26 25 1 1 0
8 1
sosppl 128 136 0 136 34 33 1 1 0
8 1
sockpl 384 11490 0 11461 118 107 11 15 0
8 8
mcl64k 65536 35 0 0 3 0 3 3 0
8 0
mcl16k 16384 17 0 0 3 0 3 3 0
8 0
mcl12k 12288 15 0 0 2 0 2 2 0
8 0
mcl9k 9216 12 0 0 1 0 1 1 0
8 0
mcl8k 8192 33 0 0 4 1 3 3 0
8 0
mcl4k 4096 17 0 0 3 0 3 3 0
8 0
mcl2k2 2112 10 0 0 1 0 1 1 0
8 0
mcl2k 2048 186 0 0 18 2 16 18 0
8 0
mtagpl 80 1 0 0 1 0 1 1 0
8 0
mbufpl 256 827 0 0 21 0 21 21 0
8 0
bufpl 280 19882 0 12816 506 0 506 506 0
8 0
anonpl 16 763570 0 754328 209 134 75 78 0 125
21
amapchunkpl 152 53740 0 53614 178 165 13 20 0
158 7
amappl16 192 30656 0 30003 268 228 40 58 0
8 5
amappl15 184 703 0 697 1 0 1 1 0
8 0
amappl14 176 1825 0 1822 1 0 1 1 0
8 0
amappl13 168 326 0 322 1 0 1 1 0
8 0
amappl12 160 285 0 282 2 1 1 1 0
8 0
amappl11 152 781 0 770 1 0 1 1 0
8 0
amappl10 144 454 0 451 1 0 1 1 0
8 0
amappl9 136 2335 0 2329 1 0 1 1 0
8 0
amappl8 128 1612 0 1532 4 1 3 3 0
8 0
amappl7 120 1144 0 1128 1 0 1 1 0
8 0
amappl6 112 521 0 508 1 0 1 1 0
8 0
amappl5 104 1297 0 1287 1 0 1 1 0
8 0
amappl4 96 4869 0 4829 2 1 1 2 0
8 0
amappl3 88 1121 0 1114 1 0 1 1 0
8 0
amappl2 80 27876 0 27798 3 1 2 3 0
8 0
amappl1 72 138438 0 137986 37 27 10 20 0
8 0
amappl 80 15614 0 15570 2 0 2 2 0
84 0
dma4096 4096 1 0 1 1 1 0 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 64 139 0 10 3 0 3 3 0
8 0
uaddrrnd 24 4557 0 4541 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 4557 0 4541 1 0 1 1 0
8 0
vmmpekpl 168 47696 0 47662 2 0 2 2 0
8 0
vmmpepl 168 646944 0 644975 330 220 110 123 0 357
15
vmsppl 368 4556 0 4541 2 0 2 2 0
8 0
pdppl 4096 9121 0 9082 6 0 6 6 0
8 0
pvpl 32 2066020 0 2053439 474 286 188 191 0 265
55
pmappl 232 4556 0 4541 27 25 2 2 0
8 0
extentpl 40 46 0 29 1 0 1 1 0
8 0
phpool 112 212 0 27 6 0 6 6 0
8 0
---
This bug is generated by a bot. It may contain errors.
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