uvm_fault: knote_processfork
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syzbot
Aug 11, 2026, 4:52:28 AM (7 days ago) Aug 11
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 513d7cacacc3 Merge remote-tracking branch 'origin/master' ..
git tree: https://github.com/blackgnezdo/openbsd-src.git syzbot-kasan
console output: https://syzkaller.appspot.com/x/log.txt?x=10929879580000
kernel config: https://syzkaller.appspot.com/x/.config?x=85e25e37d09e1b88
dashboard link: https://syzkaller.appspot.com/bug?extid=6fcb9f25ae485dbdce47
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/eb488c5a0bea/disk-513d7cac.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/d16ccf04a461/bsd-513d7cac.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/105ffbe52fd0/kernel-513d7cac.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6fcb9f...@syzkaller.appspotmail.com
login: uvm_fault(0xffff800001c523e8, 0x8, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at knote_processfork+0x287: movq 0x8(%r15),%r14
TID PID UID PRFLAGS PFLAGS CPU COMMAND
346462 71934 0 0 0 0 syz-executor
*448105 71934 0 0 0x4000000 1K syz-executor
knote_processfork(ffffffff85e1b000,1076e) at knote_processfork+0x287 sys/kern/kern_event.c:2246
fork1(ffffffff85e1aca0,f0,ffffffff81c0b060,0,0,ffff80003bb9be00) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff81c0b060,0,ffffffff85481cc0,ffffffff8479da40) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff80003bb9c1e0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb9c1e0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4d362ccfa00, 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}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: uvm_fault(0xffff800001c523e8, 0x8, 0, 1) -> e
ddb{1}> show kasan
kasan: no report recorded this boot
ddb{1}> trace
knote_processfork(ffffffff85e1b000,1076e) at knote_processfork+0x287 sys/kern/kern_event.c:2246
fork1(ffffffff85e1aca0,f0,ffffffff81c0b060,0,0,ffff80003bb9be00) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff81c0b060,0,ffffffff85481cc0,ffffffff8479da40) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff80003bb9c1e0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb9c1e0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4d362ccfa00, count: -6
ddb{1}> show registers
rdi 0x8
rsi 0x1
rbp 0xffff80003bb9bcd0
rbx 0xffff8000017edbea
rdx 0
rcx 0xffff800028fe3ff0
rax 0x1
r8 0x8
r9 0x1
r10 0
r11 0xffffffff81d21a10 filt_proc
r12 0xffff80003bb9bb80
r13 0xffff80003bb9bb80
r14 0xffffffff85e1b140 process0+0x140
r15 0
rip 0xffffffff81d2fe27 knote_processfork+0x287
cs 0x8
rflags 0x10282 __ALIGN_SIZE+0xf282
rsp 0xffff80003bb9bb20
ss 0x10
knote_processfork+0x287: movq 0x8(%r15),%r14
ddb{1}> show proc
PROC (syz-executor) tid=448105 pid=71934 tcnt=3 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=68, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045ff4550,0xffff800045ff4a90
process=0xffff800045ff1360 user=0xffff80003bb91000, vmspace=0xffff800001c523e8
estcpu=18, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
67438 177202 0 0 2 0x14000 0x200 swapper
77615 278910 22925 0 2 0 0 syz-executor
93759 308890 92355 0 2 0 0 syz-executor
93759 89667 92355 0 3 0 0x4000080 fsleep syz-executor
61004 501441 23906 0 2 0 0 syz-executor
61004 500299 23906 0 3 0 0x4000080 fsleep syz-executor
58664 469526 32633 0 2 0 0 syz-executor
58664 451121 32633 0 3 0 0x4000080 fsleep syz-executor
24617 475697 83950 0 2 0 0 syz-executor
24617 182640 83950 0 3 0 0x4000080 kqsel syz-executor
71934 346462 49088 0 7 0 0 syz-executor
71934 115179 49088 0 3 0 0x4000080 fsleep syz-executor
*71934 448105 49088 0 7 0 0x4000000 syz-executor
39084 46869 50839 0 3 0 0x80 nanoslp syz-executor
39084 324229 50839 0 3 0 0x4000080 msgwait syz-executor
39084 441089 50839 0 3 0 0x4000080 msgwait syz-executor
39084 362733 50839 0 3 0 0x4000080 fsleep syz-executor
50839 383886 22338 0 3 0x2 0x80 nanoslp syz-executor
5614 220475 22338 0 3 0x2 0x80 nanoslp syz-executor
23906 328568 22338 0 3 0x2 0x80 nanoslp syz-executor
32633 66605 22338 0 3 0x2 0x80 nanoslp syz-executor
22925 75689 22338 0 3 0x2 0x80 nanoslp syz-executor
92355 487993 22338 0 3 0x2 0x80 nanoslp syz-executor
83950 306068 22338 0 3 0x2 0x80 nanoslp syz-executor
49088 368310 22338 0 3 0x2 0x80 nanoslp syz-executor
22338 110627 7661 0 3 0x2 0x80 kqread syz-executor
7661 5718 36021 0 3 0x100002 0x88 sigsusp ksh
36021 251384 32599 0 3 0x10 0x88 kqread sshd-session
32599 391794 14787 0 3 0x12 0x80 kqread sshd-session
31962 77586 1 0 3 0x100003 0x80 ttyin getty
14787 63626 1 0 3 0 0x88 kqread sshd
92890 236382 26415 74 3 0x1100012 0x80 bpf pflogd
26415 25257 1 0 3 0 0x80 sbwait pflogd
65831 351643 9213 73 3 0x1100010 0x80 kqread syslogd
9213 47354 1 0 3 0x100002 0x80 sbwait syslogd
96840 486203 1 0 3 0x100000 0x80 kqread resolvd
30653 127764 50851 77 3 0x100012 0x80 kqread dhcpleased
496 491147 50851 77 3 0x100012 0x80 kqread dhcpleased
50851 444382 1 0 3 0 0x80 kqread dhcpleased
49827 354647 0 0 3 0x14000 0x200 bored smr
21394 42328 0 0 2 0x14000 0x200 zerothread
46064 158638 0 0 3 0x14000 0x200 aiodoned aiodoned
526 229957 0 0 3 0x14000 0x200 syncer update
43789 17577 0 0 3 0x14000 0x200 cleaner cleaner
34861 107261 0 0 3 0x14000 0x200 reaper reaper
45829 418400 0 0 3 0x14000 0x200 pgdaemon pagedaemon
3200 290405 0 0 3 0x14000 0x200 bored viomb
87692 325903 0 0 3 0x14000 0x40000200 acpi0 acpi0
90930 177530 0 0 3 0x14000 0x40000200 idle1
61888 85718 0 0 3 0x14000 0x200 bored softnet1
78168 302915 0 0 3 0x14000 0x200 bored softnet0
86641 360340 0 0 3 0x14000 0x200 bored systqmp
77250 494571 0 0 3 0x14000 0x200 bored systq
49511 2649 0 0 3 0x14000 0x200 tmoslp softclockmp
26323 358983 0 0 3 0x14000 0x40000200 tmoslp softclock
55443 280661 0 0 3 0x14000 0x40000200 idle0
1 402847 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &pr->ps_mtx r = 0 (0xffffffff85e1b118)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x683 sys/kern/kern_lock.c:487
#2 knote_processfork+0x666 sys/kern/kern_event.c:-1
#3 fork1+0x1225 sys/kern/kern_fork.c:511
#4 kthread_create+0xa8 sys/kern/kern_kthread.c:61
#5 sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
#5 sys_acct+0x35e sys/kern/kern_acct.c:151
#6 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#7 Xsyscall+0x128
Process 71934 (syz-executor) thread 0xffff800045ff5a10 (448105)
exclusive rwlock acctlk r = 0 (0xffffffff84f69c38)
#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 sys_acct+0x1be sys/kern/kern_acct.c:137
#3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#4 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff8551c040)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline]
#1 syscall+0x1048 sys/arch/amd64/amd64/trap.c:783
#2 Xsyscall+0x128
exclusive mutex &pr->ps_mtx r = 0 (0xffffffff85e1b118)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x683 sys/kern/kern_lock.c:487
#2 knote_processfork+0x666 sys/kern/kern_event.c:-1
#3 fork1+0x1225 sys/kern/kern_fork.c:511
#4 kthread_create+0xa8 sys/kern/kern_kthread.c:61
#5 sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
#5 sys_acct+0x35e sys/kern/kern_acct.c:151
#6 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#7 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11057 12244K 12244K 166960K 12150 0
pcb 18 24K 24K 166960K 21 0
rtable 237 12K 13K 166960K 351 0
pf 34 22K 22K 166960K 45 0
ifaddr 43 12K 12K 166960K 45 0
ifgroup 55 2K 2K 166960K 55 0
sysctl 1 1K 13K 166960K 5 0
counters 70 42K 42K 166960K 70 0
ioctlops 0 0K 4K 166960K 1483 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1302 84K 84K 166960K 1375 0
UFS quota 1 36K 36K 166960K 1 0
UFS mount 5 44K 44K 166960K 5 0
shm 2 2K 2K 166960K 2 0
VM map 2 1K 1K 166960K 2 0
sem 2 0K 0K 166960K 2 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 292K 166960K 11964 0
file desc 18 65K 97K 166960K 143 0
sigio 0 0K 0K 166960K 1 0
proc 69 128K 193K 166960K 557 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 99 7K 7K 166960K 99 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 2 0
ISOFS mount 1 36K 36K 166960K 1 0
MSDOSFS mount 1 20K 20K 166960K 1 0
ttys 37 263K 263K 166960K 37 0
exec 0 0K 2K 166960K 383 0
fusefs mount 1 36K 36K 166960K 1 0
tdb 3 1K 1K 166960K 3 0
VM swap 14 124K 124K 166960K 15 0
UVM amap 243 245K 269K 166960K 3218 0
UVM aobj 3 4K 4K 166960K 3 0
pinsyscall 1067 1718K 1731K 166960K 1302 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 28 2K 2K 166960K 28 0
temp 35 9162K 9172K 166960K 3852 0
kqueue 15 45K 45K 166960K 27 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 30 1 0 1 1 0 8 0
rtentry 176 111 0 1 5 0 5 5 0 8 0
unpcb 144 42 0 23 1 0 1 1 0 8 0
syncache 336 4 0 4 1 0 1 1 0 8 1
tcpcb 736 10 0 6 1 0 1 1 0 8 0
arp 136 18 0 0 1 0 1 1 0 8 0
inpcb 328 74 0 63 2 0 2 2 0 8 0
nd6 152 24 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 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 18 0 0 1 0 1 1 0 8 0
pfstkey 128 18 0 0 1 0 1 1 0 8 0
pfstate 448 18 0 0 2 0 2 2 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 452 0 0 29 0 29 29 0 8 0
art_table 40 453 0 0 5 0 5 5 0 8 0
art_node 32 111 0 11 1 0 1 1 0 8 0
sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1579 0 106 93 0 93 93 0 8 0
ffsino 296 1579 0 106 114 0 114 114 0 8 0
nchpl 144 1784 0 73 64 0 64 64 0 8 0
vnodes 216 1675 0 0 94 0 94 94 0 8 0
namei 1024 5462 0 5462 1 0 1 1 0 8 1
percpumem 16 51 0 0 1 0 1 1 0 8 0
kstatmem 264 27 0 0 2 0 2 2 0 8 0
scxspl 216 6688 0 6688 4 3 1 3 1 8 1
plimitpl 152 30 0 12 1 0 1 1 0 8 0
sigapl 424 462 0 413 7 0 7 7 0 8 1
knotepl 120 56 0 0 2 0 2 2 0 8 0
kqueuepl 224 26 0 13 1 0 1 1 0 8 0
pipepl 344 129 0 101 3 0 3 3 0 8 0
fdescpl 528 445 0 413 3 0 3 3 0 8 0
filepl 160 1607 0 1375 10 0 10 10 0 8 0
lockfpl 104 10 0 8 1 0 1 1 0 8 0
lockfspl 48 6 0 4 1 0 1 1 0 8 0
sessionpl 144 25 0 16 1 0 1 1 0 8 0
pgrppl 48 33 0 16 1 0 1 1 0 8 0
ucredpl 104 93 0 79 1 0 1 1 0 8 0
zombiepl 144 414 0 413 1 0 1 1 0 8 0
processpl 1232 462 0 413 5 0 5 5 0 8 0
procpl 664 479 0 421 5 0 5 5 0 8 0
sosppl 176 1 0 0 1 0 1 1 0 8 0
sockpl 752 150 0 116 4 0 4 4 0 8 0
mcl64k 65536 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 122 0 0 16 0 16 16 0 8 0
mcl2k 2048 21 0 0 3 0 3 3 0 8 0
mextrefs 64 21 0 0 1 0 1 1 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 181 0 0 12 0 12 12 0 8 0
bufpl 272 2322 0 106 148 0 148 148 0 8 0
anonpl 32 3732 0 0 31 0 31 31 0 222 0
amapchunkpl 152 8502 0 7980 21 0 21 21 0 158 0
amappl16 200 1667 0 1632 5 0 5 5 0 8 3
amappl15 192 3 0 3 1 0 1 1 0 8 1
amappl14 184 430 0 429 1 0 1 1 0 8 0
amappl13 176 135 0 123 1 0 1 1 0 8 0
amappl12 168 698 0 668 2 0 2 2 0 8 0
amappl11 160 8 0 7 3 2 1 1 0 8 0
amappl10 152 70 0 55 1 0 1 1 0 8 0
amappl9 144 313 0 313 1 0 1 1 0 8 1
amappl8 136 106 0 104 1 0 1 1 0 8 0
amappl7 128 150 0 135 1 0 1 1 0 8 0
amappl6 120 154 0 153 1 0 1 1 0 8 0
amappl5 112 183 0 173 1 0 1 1 0 8 0
amappl4 104 314 0 296 1 0 1 1 0 8 0
amappl3 96 1473 0 1370 3 0 3 3 0 8 0
amappl2 88 555 0 482 2 0 2 2 0 8 0
amappl1 80 10358 0 9759 16 1 15 15 0 8 2
amappl 88 2491 0 2320 4 0 4 4 0 92 0
uvmvnodes 80 98 0 0 2 0 2 2 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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 445 0 413 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 445 0 413 1 0 1 1 0 8 0
vmmpekpl 168 5655 0 5622 2 0 2 2 0 8 0
vmmpepl 168 38113 0 36165 87 0 87 87 0 357 1
vmsppl 488 444 0 413 5 0 5 5 0 8 0
rwobjpl 80 14349 0 13313 25 0 25 25 0 8 1
pdppl 4096 899 0 826 103 14 89 89 0 8 16
pvpl 32 11504 0 0 94 1 93 93 0 265 0
pmappl 256 444 0 413 3 0 3 3 0 8 0
extentpl 40 47 0 29 1 0 1 1 0 8 0
phpool 120 423 0 17 13 0 13 13 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x19: leave
x86_ipi_db(ffffffff8534eff0) 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
__mp_lock(ffffffff8551b840) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff8551b840) at __mp_lock+0x272 sys/kern/kern_lock.c:173
softintr_dispatch(0) at softintr_dispatch+0x215 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x7b sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
end of kernel
end trace frame: 0x717438945610, count: 8
ddb{0}> trace
x86_ipi_db(ffffffff8534eff0) 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
__mp_lock(ffffffff8551b840) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff8551b840) at __mp_lock+0x272 sys/kern/kern_lock.c:173
softintr_dispatch(0) at softintr_dispatch+0x215 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x7b sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
end of kernel
end trace frame: 0x717438945610, count: -7
ddb{0}> machine ddbcpu 1
Stopped at knote_processfork+0x287: movq 0x8(%r15),%r14
knote_processfork(ffffffff85e1b000,1076e) at knote_processfork+0x287 sys/kern/kern_event.c:2246
fork1(ffffffff85e1aca0,f0,ffffffff81c0b060,0,0,ffff80003bb9be00) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff81c0b060,0,ffffffff85481cc0,ffffffff8479da40) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff80003bb9c1e0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb9c1e0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4d362ccfa00, count: 9
ddb{1}> trace
knote_processfork(ffffffff85e1b000,1076e) at knote_processfork+0x287 sys/kern/kern_event.c:2246
fork1(ffffffff85e1aca0,f0,ffffffff81c0b060,0,0,ffff80003bb9be00) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff81c0b060,0,ffffffff85481cc0,ffffffff8479da40) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff80003bb9c1e0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb9c1e0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4d362ccfa00, count: -6
---
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syzbot found the following issue on:
HEAD commit: 513d7cacacc3 Merge remote-tracking branch 'origin/master' ..
git tree: https://github.com/blackgnezdo/openbsd-src.git syzbot-kasan
console output: https://syzkaller.appspot.com/x/log.txt?x=10929879580000
kernel config: https://syzkaller.appspot.com/x/.config?x=85e25e37d09e1b88
dashboard link: https://syzkaller.appspot.com/bug?extid=6fcb9f25ae485dbdce47
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/eb488c5a0bea/disk-513d7cac.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/d16ccf04a461/bsd-513d7cac.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/105ffbe52fd0/kernel-513d7cac.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6fcb9f...@syzkaller.appspotmail.com
login: uvm_fault(0xffff800001c523e8, 0x8, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at knote_processfork+0x287: movq 0x8(%r15),%r14
TID PID UID PRFLAGS PFLAGS CPU COMMAND
346462 71934 0 0 0 0 syz-executor
*448105 71934 0 0 0x4000000 1K syz-executor
knote_processfork(ffffffff85e1b000,1076e) at knote_processfork+0x287 sys/kern/kern_event.c:2246
fork1(ffffffff85e1aca0,f0,ffffffff81c0b060,0,0,ffff80003bb9be00) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff81c0b060,0,ffffffff85481cc0,ffffffff8479da40) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff80003bb9c1e0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb9c1e0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4d362ccfa00, 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}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: uvm_fault(0xffff800001c523e8, 0x8, 0, 1) -> e
ddb{1}> show kasan
kasan: no report recorded this boot
ddb{1}> trace
knote_processfork(ffffffff85e1b000,1076e) at knote_processfork+0x287 sys/kern/kern_event.c:2246
fork1(ffffffff85e1aca0,f0,ffffffff81c0b060,0,0,ffff80003bb9be00) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff81c0b060,0,ffffffff85481cc0,ffffffff8479da40) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff80003bb9c1e0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb9c1e0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4d362ccfa00, count: -6
ddb{1}> show registers
rdi 0x8
rsi 0x1
rbp 0xffff80003bb9bcd0
rbx 0xffff8000017edbea
rdx 0
rcx 0xffff800028fe3ff0
rax 0x1
r8 0x8
r9 0x1
r10 0
r11 0xffffffff81d21a10 filt_proc
r12 0xffff80003bb9bb80
r13 0xffff80003bb9bb80
r14 0xffffffff85e1b140 process0+0x140
r15 0
rip 0xffffffff81d2fe27 knote_processfork+0x287
cs 0x8
rflags 0x10282 __ALIGN_SIZE+0xf282
rsp 0xffff80003bb9bb20
ss 0x10
knote_processfork+0x287: movq 0x8(%r15),%r14
ddb{1}> show proc
PROC (syz-executor) tid=448105 pid=71934 tcnt=3 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=68, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045ff4550,0xffff800045ff4a90
process=0xffff800045ff1360 user=0xffff80003bb91000, vmspace=0xffff800001c523e8
estcpu=18, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
67438 177202 0 0 2 0x14000 0x200 swapper
77615 278910 22925 0 2 0 0 syz-executor
93759 308890 92355 0 2 0 0 syz-executor
93759 89667 92355 0 3 0 0x4000080 fsleep syz-executor
61004 501441 23906 0 2 0 0 syz-executor
61004 500299 23906 0 3 0 0x4000080 fsleep syz-executor
58664 469526 32633 0 2 0 0 syz-executor
58664 451121 32633 0 3 0 0x4000080 fsleep syz-executor
24617 475697 83950 0 2 0 0 syz-executor
24617 182640 83950 0 3 0 0x4000080 kqsel syz-executor
71934 346462 49088 0 7 0 0 syz-executor
71934 115179 49088 0 3 0 0x4000080 fsleep syz-executor
*71934 448105 49088 0 7 0 0x4000000 syz-executor
39084 46869 50839 0 3 0 0x80 nanoslp syz-executor
39084 324229 50839 0 3 0 0x4000080 msgwait syz-executor
39084 441089 50839 0 3 0 0x4000080 msgwait syz-executor
39084 362733 50839 0 3 0 0x4000080 fsleep syz-executor
50839 383886 22338 0 3 0x2 0x80 nanoslp syz-executor
5614 220475 22338 0 3 0x2 0x80 nanoslp syz-executor
23906 328568 22338 0 3 0x2 0x80 nanoslp syz-executor
32633 66605 22338 0 3 0x2 0x80 nanoslp syz-executor
22925 75689 22338 0 3 0x2 0x80 nanoslp syz-executor
92355 487993 22338 0 3 0x2 0x80 nanoslp syz-executor
83950 306068 22338 0 3 0x2 0x80 nanoslp syz-executor
49088 368310 22338 0 3 0x2 0x80 nanoslp syz-executor
22338 110627 7661 0 3 0x2 0x80 kqread syz-executor
7661 5718 36021 0 3 0x100002 0x88 sigsusp ksh
36021 251384 32599 0 3 0x10 0x88 kqread sshd-session
32599 391794 14787 0 3 0x12 0x80 kqread sshd-session
31962 77586 1 0 3 0x100003 0x80 ttyin getty
14787 63626 1 0 3 0 0x88 kqread sshd
92890 236382 26415 74 3 0x1100012 0x80 bpf pflogd
26415 25257 1 0 3 0 0x80 sbwait pflogd
65831 351643 9213 73 3 0x1100010 0x80 kqread syslogd
9213 47354 1 0 3 0x100002 0x80 sbwait syslogd
96840 486203 1 0 3 0x100000 0x80 kqread resolvd
30653 127764 50851 77 3 0x100012 0x80 kqread dhcpleased
496 491147 50851 77 3 0x100012 0x80 kqread dhcpleased
50851 444382 1 0 3 0 0x80 kqread dhcpleased
49827 354647 0 0 3 0x14000 0x200 bored smr
21394 42328 0 0 2 0x14000 0x200 zerothread
46064 158638 0 0 3 0x14000 0x200 aiodoned aiodoned
526 229957 0 0 3 0x14000 0x200 syncer update
43789 17577 0 0 3 0x14000 0x200 cleaner cleaner
34861 107261 0 0 3 0x14000 0x200 reaper reaper
45829 418400 0 0 3 0x14000 0x200 pgdaemon pagedaemon
3200 290405 0 0 3 0x14000 0x200 bored viomb
87692 325903 0 0 3 0x14000 0x40000200 acpi0 acpi0
90930 177530 0 0 3 0x14000 0x40000200 idle1
61888 85718 0 0 3 0x14000 0x200 bored softnet1
78168 302915 0 0 3 0x14000 0x200 bored softnet0
86641 360340 0 0 3 0x14000 0x200 bored systqmp
77250 494571 0 0 3 0x14000 0x200 bored systq
49511 2649 0 0 3 0x14000 0x200 tmoslp softclockmp
26323 358983 0 0 3 0x14000 0x40000200 tmoslp softclock
55443 280661 0 0 3 0x14000 0x40000200 idle0
1 402847 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &pr->ps_mtx r = 0 (0xffffffff85e1b118)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x683 sys/kern/kern_lock.c:487
#2 knote_processfork+0x666 sys/kern/kern_event.c:-1
#3 fork1+0x1225 sys/kern/kern_fork.c:511
#4 kthread_create+0xa8 sys/kern/kern_kthread.c:61
#5 sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
#5 sys_acct+0x35e sys/kern/kern_acct.c:151
#6 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#7 Xsyscall+0x128
Process 71934 (syz-executor) thread 0xffff800045ff5a10 (448105)
exclusive rwlock acctlk r = 0 (0xffffffff84f69c38)
#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 sys_acct+0x1be sys/kern/kern_acct.c:137
#3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#4 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff8551c040)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline]
#1 syscall+0x1048 sys/arch/amd64/amd64/trap.c:783
#2 Xsyscall+0x128
exclusive mutex &pr->ps_mtx r = 0 (0xffffffff85e1b118)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x683 sys/kern/kern_lock.c:487
#2 knote_processfork+0x666 sys/kern/kern_event.c:-1
#3 fork1+0x1225 sys/kern/kern_fork.c:511
#4 kthread_create+0xa8 sys/kern/kern_kthread.c:61
#5 sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
#5 sys_acct+0x35e sys/kern/kern_acct.c:151
#6 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#7 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11057 12244K 12244K 166960K 12150 0
pcb 18 24K 24K 166960K 21 0
rtable 237 12K 13K 166960K 351 0
pf 34 22K 22K 166960K 45 0
ifaddr 43 12K 12K 166960K 45 0
ifgroup 55 2K 2K 166960K 55 0
sysctl 1 1K 13K 166960K 5 0
counters 70 42K 42K 166960K 70 0
ioctlops 0 0K 4K 166960K 1483 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1302 84K 84K 166960K 1375 0
UFS quota 1 36K 36K 166960K 1 0
UFS mount 5 44K 44K 166960K 5 0
shm 2 2K 2K 166960K 2 0
VM map 2 1K 1K 166960K 2 0
sem 2 0K 0K 166960K 2 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 292K 166960K 11964 0
file desc 18 65K 97K 166960K 143 0
sigio 0 0K 0K 166960K 1 0
proc 69 128K 193K 166960K 557 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 99 7K 7K 166960K 99 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 2 0
ISOFS mount 1 36K 36K 166960K 1 0
MSDOSFS mount 1 20K 20K 166960K 1 0
ttys 37 263K 263K 166960K 37 0
exec 0 0K 2K 166960K 383 0
fusefs mount 1 36K 36K 166960K 1 0
tdb 3 1K 1K 166960K 3 0
VM swap 14 124K 124K 166960K 15 0
UVM amap 243 245K 269K 166960K 3218 0
UVM aobj 3 4K 4K 166960K 3 0
pinsyscall 1067 1718K 1731K 166960K 1302 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 28 2K 2K 166960K 28 0
temp 35 9162K 9172K 166960K 3852 0
kqueue 15 45K 45K 166960K 27 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 30 1 0 1 1 0 8 0
rtentry 176 111 0 1 5 0 5 5 0 8 0
unpcb 144 42 0 23 1 0 1 1 0 8 0
syncache 336 4 0 4 1 0 1 1 0 8 1
tcpcb 736 10 0 6 1 0 1 1 0 8 0
arp 136 18 0 0 1 0 1 1 0 8 0
inpcb 328 74 0 63 2 0 2 2 0 8 0
nd6 152 24 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 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 18 0 0 1 0 1 1 0 8 0
pfstkey 128 18 0 0 1 0 1 1 0 8 0
pfstate 448 18 0 0 2 0 2 2 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 452 0 0 29 0 29 29 0 8 0
art_table 40 453 0 0 5 0 5 5 0 8 0
art_node 32 111 0 11 1 0 1 1 0 8 0
sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1579 0 106 93 0 93 93 0 8 0
ffsino 296 1579 0 106 114 0 114 114 0 8 0
nchpl 144 1784 0 73 64 0 64 64 0 8 0
vnodes 216 1675 0 0 94 0 94 94 0 8 0
namei 1024 5462 0 5462 1 0 1 1 0 8 1
percpumem 16 51 0 0 1 0 1 1 0 8 0
kstatmem 264 27 0 0 2 0 2 2 0 8 0
scxspl 216 6688 0 6688 4 3 1 3 1 8 1
plimitpl 152 30 0 12 1 0 1 1 0 8 0
sigapl 424 462 0 413 7 0 7 7 0 8 1
knotepl 120 56 0 0 2 0 2 2 0 8 0
kqueuepl 224 26 0 13 1 0 1 1 0 8 0
pipepl 344 129 0 101 3 0 3 3 0 8 0
fdescpl 528 445 0 413 3 0 3 3 0 8 0
filepl 160 1607 0 1375 10 0 10 10 0 8 0
lockfpl 104 10 0 8 1 0 1 1 0 8 0
lockfspl 48 6 0 4 1 0 1 1 0 8 0
sessionpl 144 25 0 16 1 0 1 1 0 8 0
pgrppl 48 33 0 16 1 0 1 1 0 8 0
ucredpl 104 93 0 79 1 0 1 1 0 8 0
zombiepl 144 414 0 413 1 0 1 1 0 8 0
processpl 1232 462 0 413 5 0 5 5 0 8 0
procpl 664 479 0 421 5 0 5 5 0 8 0
sosppl 176 1 0 0 1 0 1 1 0 8 0
sockpl 752 150 0 116 4 0 4 4 0 8 0
mcl64k 65536 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 122 0 0 16 0 16 16 0 8 0
mcl2k 2048 21 0 0 3 0 3 3 0 8 0
mextrefs 64 21 0 0 1 0 1 1 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 181 0 0 12 0 12 12 0 8 0
bufpl 272 2322 0 106 148 0 148 148 0 8 0
anonpl 32 3732 0 0 31 0 31 31 0 222 0
amapchunkpl 152 8502 0 7980 21 0 21 21 0 158 0
amappl16 200 1667 0 1632 5 0 5 5 0 8 3
amappl15 192 3 0 3 1 0 1 1 0 8 1
amappl14 184 430 0 429 1 0 1 1 0 8 0
amappl13 176 135 0 123 1 0 1 1 0 8 0
amappl12 168 698 0 668 2 0 2 2 0 8 0
amappl11 160 8 0 7 3 2 1 1 0 8 0
amappl10 152 70 0 55 1 0 1 1 0 8 0
amappl9 144 313 0 313 1 0 1 1 0 8 1
amappl8 136 106 0 104 1 0 1 1 0 8 0
amappl7 128 150 0 135 1 0 1 1 0 8 0
amappl6 120 154 0 153 1 0 1 1 0 8 0
amappl5 112 183 0 173 1 0 1 1 0 8 0
amappl4 104 314 0 296 1 0 1 1 0 8 0
amappl3 96 1473 0 1370 3 0 3 3 0 8 0
amappl2 88 555 0 482 2 0 2 2 0 8 0
amappl1 80 10358 0 9759 16 1 15 15 0 8 2
amappl 88 2491 0 2320 4 0 4 4 0 92 0
uvmvnodes 80 98 0 0 2 0 2 2 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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 445 0 413 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 445 0 413 1 0 1 1 0 8 0
vmmpekpl 168 5655 0 5622 2 0 2 2 0 8 0
vmmpepl 168 38113 0 36165 87 0 87 87 0 357 1
vmsppl 488 444 0 413 5 0 5 5 0 8 0
rwobjpl 80 14349 0 13313 25 0 25 25 0 8 1
pdppl 4096 899 0 826 103 14 89 89 0 8 16
pvpl 32 11504 0 0 94 1 93 93 0 265 0
pmappl 256 444 0 413 3 0 3 3 0 8 0
extentpl 40 47 0 29 1 0 1 1 0 8 0
phpool 120 423 0 17 13 0 13 13 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x19: leave
x86_ipi_db(ffffffff8534eff0) 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
__mp_lock(ffffffff8551b840) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff8551b840) at __mp_lock+0x272 sys/kern/kern_lock.c:173
softintr_dispatch(0) at softintr_dispatch+0x215 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x7b sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
end of kernel
end trace frame: 0x717438945610, count: 8
ddb{0}> trace
x86_ipi_db(ffffffff8534eff0) 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
__mp_lock(ffffffff8551b840) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff8551b840) at __mp_lock+0x272 sys/kern/kern_lock.c:173
softintr_dispatch(0) at softintr_dispatch+0x215 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x7b sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
end of kernel
end trace frame: 0x717438945610, count: -7
ddb{0}> machine ddbcpu 1
Stopped at knote_processfork+0x287: movq 0x8(%r15),%r14
knote_processfork(ffffffff85e1b000,1076e) at knote_processfork+0x287 sys/kern/kern_event.c:2246
fork1(ffffffff85e1aca0,f0,ffffffff81c0b060,0,0,ffff80003bb9be00) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff81c0b060,0,ffffffff85481cc0,ffffffff8479da40) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff80003bb9c1e0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb9c1e0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4d362ccfa00, count: 9
ddb{1}> trace
knote_processfork(ffffffff85e1b000,1076e) at knote_processfork+0x287 sys/kern/kern_event.c:2246
fork1(ffffffff85e1aca0,f0,ffffffff81c0b060,0,0,ffff80003bb9be00) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff81c0b060,0,ffffffff85481cc0,ffffffff8479da40) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800045ff5a10,ffff80003bb9c1e0,ffff80003bb9c140) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff80003bb9c1e0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb9c1e0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4d362ccfa00, count: -6
---
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