Hello,
syzbot found the following issue on:
HEAD commit: 710ece6a621e Use softnet threads for socket splicing.
git tree: openbsd
console output:
https://syzkaller.appspot.com/x/log.txt?x=12222614580000
kernel config:
https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link:
https://syzkaller.appspot.com/bug?extid=69404101963633b56833
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/40067a6edd16/disk-710ece6a.raw.xz
bsd.gdb:
https://storage.googleapis.com/syzbot-assets/205e0d14f618/bsd-710ece6a.gdb.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/ee3cb85cb20f/kernel-710ece6a.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+694041...@syzkaller.appspotmail.com
kernel: protection fault trap, code=0
Stopped at mtx_enter+0x6e: movq 0(%r14),%rax
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
the kernel did not panic
ddb> trace
mtx_enter(deafbeaddeafbf8d) at mtx_enter+0x6e sys/kern/kern_lock.c:335
prsignal(deafbeaddeafbead,14) at prsignal+0x36 sys/kern/kern_sig.c:904
reaper(ffff80002a73d758) at reaper+0x29c sys/kern/kern_exit.c:516
end trace frame: 0x0, count: -3
ddb> show registers
rdi 0
rsi 0
rbp 0xffff80002a773330
rbx 0x40000 acpi_pdirpa+0x2be71
rdx 0
rcx 0xffffffff8377cff0 cpu_info_full_primary+0x1ff0
rax 0xffff80002a73d700
r8 0x9
r9 0
r10 0xc0d95fbd8563b237
r11 0xabe23a68aa984777
r12 0xdeafbeaddeafbead
r13 0x40000 acpi_pdirpa+0x2be71
r14 0xdeafbeaddeafbf8d
r15 0
rip 0xffffffff82dcc79e mtx_enter+0x6e
cs 0x8
rflags 0x10297 __ALIGN_SIZE+0xf297
rsp 0xffff80002a773300
ss 0x10
mtx_enter+0x6e: movq 0(%r14),%rax
ddb> show proc
PROC (reaper) tid=405379 pid=14331 tcnt=1 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a73d4c0,0xffff80002a73da00
process=0xffff8000ffffd200 user=0xffff80002a76e000, vmspace=0xffffffff83986ec0
estcpu=0, cpticks=5, pctcpu=0.0, user=0, sys=0, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
52192 238972 0 0 3 0x14280 nfsidl nfsio
60515 18221 82550 0 2 0 syz-executor
60515 394624 82550 0 2 0x4000000 syz-executor
63192 441523 0 0 3 0x14280 nfsidl nfsio
72882 484629 0 0 3 0x14280 nfsidl nfsio
94733 390742 8668 0 2 0 syz-executor
94733 291601 8668 0 3 0x4000080 sysctllk syz-executor
1601 294842 0 0 3 0x14280 nfsidl nfsio
98015 108531 37006 -1 2 0x10 syz-executor
98015 352953 37006 -1 3 0x4000090 fsleep syz-executor
71332 359610 64365 0 2 0 syz-executor
71332 332292 64365 0 3 0x4000080 fsleep syz-executor
83781 166764 85622 0 2 0 syz-executor
83781 147844 85622 0 3 0x4000080 fsleep syz-executor
83781 158784 85622 0 3 0x4000080 fsleep syz-executor
8896 462103 77356 0 2 0 syz-executor
8896 240976 77356 0 2 0x4000000 syz-executor
8896 399340 77356 0 2 0x4000080 syz-executor
82550 433681 56366 0 3 0x82 nanoslp syz-executor
18987 478533 1 0 3 0x100083 ttyin getty
8668 487190 56366 0 3 0x82 nanoslp syz-executor
49044 80231 56366 0 3 0x82 wait syz-executor
85622 170473 56366 0 3 0x82 nanoslp syz-executor
64365 266684 56366 0 3 0x82 nanoslp syz-executor
37006 6146 56366 0 3 0x82 nanoslp syz-executor
36120 441493 56366 0 2 0x2 syz-executor
77356 171232 56366 0 3 0x82 nanoslp syz-executor
56366 111573 67163 0 3 0x82 kqread syz-executor
67163 41076 33061 0 3 0x10008a sigsusp ksh
33061 253414 46725 0 3 0x98 kqread sshd-session
46725 485357 56724 0 3 0x92 kqread sshd-session
56724 302033 1 0 3 0x88 kqread sshd
39096 140105 1697 73 3 0x1100090 kqread syslogd
1697 39027 1 0 3 0x100082 sbwait syslogd
51267 247469 1 0 3 0x100080 kqread resolvd
30294 29978 4113 77 3 0x100092 kqread dhcpleased
2161 390637 4113 77 3 0x100092 kqread dhcpleased
4113 170824 1 0 3 0x80 kqread dhcpleased
28504 360255 0 0 3 0x14200 bored smr
31467 39783 0 0 2 0x14200 zerothread
40466 408307 0 0 3 0x14200 aiodoned aiodoned
69465 339580 0 0 3 0x14200 syncer update
37243 458904 0 0 3 0x14200 cleaner cleaner
*14331 405379 0 0 7 0x14200 reaper
23400 281720 0 0 3 0x14200 pgdaemon pagedaemon
22429 232005 0 0 3 0x14200 bored viomb
20096 19227 0 0 3 0x40014200 acpi0 acpi0
71260 301637 0 0 2 0x14200 softnet0
78733 373251 0 0 3 0x14200 bored systqmp
93491 175286 0 0 3 0x14200 bored systq
64595 408083 0 0 3 0x40014200 tmoslp softclock
64508 127427 0 0 3 0x40014200 idle0
1 37738 0 0 3 0x82 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10213 11206K 11562K 166960K 13031 0
pcb 17 14K 16K 166960K 390 0
rtable 224 10K 10K 166960K 600 0
pf 32 13K 14K 166960K 105 0
ifaddr 39 6K 7K 166960K 95 0
ifgroup 54 2K 2K 166960K 126 0
sysctl 4 1K 9K 166960K 12 0
counters 33 17K 18K 166960K 90 0
ioctlops 0 0K 4K 166960K 212 0
iov 0 0K 17K 166960K 80 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1473 93K 93K 166960K 2435 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 15 0
VM map 2 1K 1K 166960K 2 0
sem 12 1K 1K 166960K 87 0
dirhash 12 2K 2K 166960K 27 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 93K 166960K 983 0
sigio 0 0K 0K 166960K 76 0
proc 60 59K 100K 166960K 636 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 0 0K 0K 166960K 126 0
in_multi 87 6K 7K 166960K 160 0
ether_multi 1 0K 0K 166960K 13 0
mrt 2 0K 0K 166960K 10 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 187 837K 837K 166960K 187 0
exec 0 0K 1K 166960K 540 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 2 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 235 143K 159K 166960K 10413 0
UVM aobj 26 2K 2K 166960K 30 0
pinsyscall 38 76K 92K 166960K 2061 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 50 0
NDP 12 0K 2K 166960K 63 0
temp 54 8646K 8714K 166960K 29640 0
kqueue 17 24K 32K 166960K 217 0
SYN cache 2 16K 16K 166960K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 100 0 96 1 0 1 1 0 8 0
rtentry 136 155 0 68 4 0 4 4 0 8 0
unpcb 144 762 0 745 6 5 1 6 0 8 0
syncache 336 3 0 3 1 1 0 1 0 8 0
tcpcb 736 345 0 341 7 6 1 7 0 8 0
arp 96 21 0 7 1 0 1 1 0 8 0
ipq 40 4 0 0 1 0 1 1 0 8 0
ipqe 40 4 0 0 1 0 1 1 0 8 0
inpcb 328 1060 0 1052 17 10 7 12 0 8 6
ip6q 72 3 0 1 1 0 1 1 0 8 0
ip6af 40 5 0 2 1 0 1 1 0 8 0
nd6 112 34 0 10 1 0 1 1 0 8 0
pkpcb 40 5 0 5 2 1 1 1 0 8 1
kcovpl 48 9 0 1 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 1 0 1 0 8 0
ppxss 1072 54 0 54 2 1 1 1 0 8 1
pppxif 1384 2 0 2 1 1 0 1 0 8 0
pfrktable 1344 1 0 1 1 1 0 1 0 8 0
pfrule 1344 1 0 1 1 1 0 1 0 8 0
rttmr 136 1 0 1 1 1 0 1 0 8 0
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 826 0 347 35 5 30 30 0 8 0
art_table 40 828 0 347 5 0 5 5 0 8 0
art_node 32 154 0 75 1 0 1 1 0 8 0
sysvmsgpl 40 10 0 8 1 0 1 1 0 8 0
semapl 112 85 0 75 1 0 1 1 0 8 0
shmpl 112 27 0 4 1 0 1 1 0 8 0
dirhash 1024 27 0 10 3 0 3 3 0 8 0
dino2pl 256 3239 0 1736 95 0 95 95 0 8 0
ffsino 256 3239 0 1736 95 0 95 95 0 8 0
nchpl 144 4621 0 2925 64 0 64 64 0 8 0
rtmask 32 9 0 9 2 1 1 1 0 8 1
vnodes 216 3980 0 0 222 0 222 222 0 8 0
namei 1024 16797 0 16797 3 2 1 2 0 8 1
kstatmem 264 88 0 64 2 0 2 2 0 8 0
acpiwqpl 32 1 0 1 1 0 1 1 1 8 1
scsiplug 72 5 0 5 1 1 0 1 0 8 0
scxspl 216 15571 0 15571 15 7 8 8 1 8 8
plimitpl 152 290 0 273 1 0 1 1 0 8 0
sigapl 424 1286 0 1240 9 3 6 8 0 8 0
knotepl 120 64634 0 64579 33 23 10 17 0 8 8
kqueuepl 184 405 0 393 5 3 2 4 0 8 1
pipepl 304 279 0 252 7 4 3 7 0 8 0
fdescpl 448 1249 0 1220 5 1 4 5 0 8 0
filepl 120 8691 0 8474 17 6 11 15 0 8 2
lockfpl 104 312 0 310 1 0 1 1 0 8 0
lockfspl 48 124 0 122 1 0 1 1 0 8 0
sessionpl 144 23 0 15 1 0 1 1 0 8 0
pgrppl 48 35 0 19 1 0 1 1 0 8 0
ucredpl 104 1398 0 1384 1 0 1 1 0 8 0
zombiepl 144 1476 0 1475 1 0 1 1 0 8 0
processpl 1152 1286 0 1240 5 1 4 5 0 8 0
procpl 664 2680 0 2625 7 1 6 7 0 8 1
sosppl 176 7 0 7 2 1 1 1 0 8 1
sockpl 552 1952 0 1922 21 13 8 12 0 8 5
mcl64k 65536 143 0 143 2 1 1 1 0 8 1
mcl16k 16384 3 0 3 1 1 0 1 0 8 0
mcl12k 12288 1 0 1 1 1 0 1 0 8 0
mcl9k 9216 1 0 1 1 1 0 1 0 8 0
mcl8k 8192 10 0 10 2 1 1 1 0 8 1
mcl4k 4096 3596 0 3543 14 6 8 13 0 8 0
mcl2k2 2112 5 0 5 2 1 1 1 0 8 1
mcl2k 2048 1489 0 1481 5 3 2 5 0 8 0
mtagpl 96 19 0 11 1 0 1 1 0 8 0
mbufpl 256 16316 0 16131 188 111 77 77 0 8 62
bufpl 280 5866 0 120 411 0 411 411 0 8 0
anonpl 24 220426 0 216364 78 16 62 62 0 187 28
amapchunkpl 152 36674 0 36170 43 12 31 37 0 158 7
amappl16 200 4331 0 4274 41 30 11 15 0 8 7
amappl15 192 3 0 3 1 1 0 1 0 8 0
amappl14 184 6 0 6 1 1 0 1 0 8 0
amappl13 176 412 0 410 1 0 1 1 0 8 0
amappl12 168 1591 0 1553 3 1 2 3 0 8 0
amappl11 160 7 0 7 1 1 0 1 0 8 0
amappl10 152 41 0 31 1 0 1 1 0 8 0
amappl9 144 251 0 251 1 1 0 1 0 8 0
amappl8 136 22 0 20 1 0 1 1 0 8 0
amappl7 128 82 0 81 1 0 1 1 0 8 0
amappl6 120 292 0 280 1 0 1 1 0 8 0
amappl5 112 68 0 61 1 0 1 1 0 8 0
amappl4 104 400 0 375 1 0 1 1 0 8 0
amappl3 96 6086 0 5998 3 0 3 3 0 8 0
amappl2 88 1358 0 1287 2 0 2 2 0 8 0
amappl1 80 12210 0 11676 13 1 12 13 0 8 0
amappl 88 9561 0 9393 5 0 5 5 0 92 0
uvmvnodes 80 3980 0 0 82 0 82 82 0 8 0
dma8192 8192 1 0 1 1 1 0 1 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 8 0 8 2 1 1 1 0 8 1
dma128 128 256 0 256 1 1 0 1 0 8 0
dma64 64 7 0 7 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 29 0 4 1 0 1 1 0 8 0
uaddrrnd 24 1249 0 1220 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1249 0 1220 1 0 1 1 0 8 0
vmmpekpl 168 11443 0 11404 3 0 3 3 0 8 0
vmmpepl 168 84130 0 82310 100 8 92 92 0 357 10
vmsppl 368 1248 0 1220 4 1 3 4 0 8 0
rwobjpl 40 27986 0 23106 53 2 51 51 0 8 1
pdppl 4096 2504 0 2440 100 34 66 80 0 8 2
pvpl 32 570491 0 559844 149 13 136 136 0 265 39
pmappl 216 1248 0 1220 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 568 0 177 13 1 12 12 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
mtx_enter(deafbeaddeafbf8d) at mtx_enter+0x6e sys/kern/kern_lock.c:335
prsignal(deafbeaddeafbead,14) at prsignal+0x36 sys/kern/kern_sig.c:904
reaper(ffff80002a73d758) at reaper+0x29c sys/kern/kern_exit.c:516
end trace frame: 0x0, count: -3
ddb> machine ddbcpu 1
No such command
ddb> trace
mtx_enter(deafbeaddeafbf8d) at mtx_enter+0x6e sys/kern/kern_lock.c:335
prsignal(deafbeaddeafbead,14) at prsignal+0x36 sys/kern/kern_sig.c:904
reaper(ffff80002a73d758) at reaper+0x29c sys/kern/kern_exit.c:516
end trace frame: 0x0, count: -3
---
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