uvm_fault(0xffff800001c5e018, 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
260732 24400 0 0 0 1 syz-executor
*121454 24400 0 0 0x4000000 0 syz-executor
knote_processfork(ffffffff85423320,17f37) at knote_processfork+0x287 sys/kern/kern_event.c:2246
fork1(ffffffff85422fc0,f0,ffffffff82b481d0,0,0,ffff80003bb93e80) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff82b481d0,0,ffffffff85d6daa0,ffffffff84b32660) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800045ff7a10,ffff80003bb94260,ffff80003bb941c0) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800045ff7a10,ffff80003bb94260,ffff80003bb941c0) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff80003bb94260) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb94260) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x21afa60cab0, 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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: uvm_fault(0xffff800001c5e018, 0x8, 0, 1) -> e
ddb{0}> show kasan
kasan: no report recorded this boot
ddb{0}> trace
knote_processfork(ffffffff85423320,17f37) at knote_processfork+0x287 sys/kern/kern_event.c:2246
fork1(ffffffff85422fc0,f0,ffffffff82b481d0,0,0,ffff80003bb93e80) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff82b481d0,0,ffffffff85d6daa0,ffffffff84b32660) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800045ff7a10,ffff80003bb94260,ffff80003bb941c0) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800045ff7a10,ffff80003bb94260,ffff80003bb941c0) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff80003bb94260) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb94260) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x21afa60cab0, count: -6
ddb{0}> show registers
rdi 0x8
rsi 0x1
rbp 0xffff80003bb93d50
rbx 0xffff800001b5ed5a
rdx 0
rcx 0xffffffff850daff0 cpu_info_full_primary+0x1ff0
rax 0x1
r8 0x8
r9 0x1
r10 0
r11 0xffffffff82988680 filt_proc
r12 0xffff80003bb93c00
r13 0xffff80003bb93c00
r14 0xffffffff85423460 process0+0x140
r15 0
rip 0xffffffff82996a97 knote_processfork+0x287
cs 0x8
rflags 0x10286 __ALIGN_SIZE+0xf286
rsp 0xffff80003bb93ba0
ss 0x10
knote_processfork+0x287: movq 0x8(%r15),%r14
ddb{0}> show proc
PROC (syz-executor) tid=121454 pid=24400 tcnt=3 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=73, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045ff6fb0,0xffff800029933cb0
process=0xffff800045ff0e90 user=0xffff80003bb89000, vmspace=0xffff800001c5e018
estcpu=23, cpticks=4, pctcpu=0.0, user=0, sys=4, intr=0
ddb{0}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
98103 414130 0 0 2 0x14000 0x200 swapper
83476 7841 33981 0 2 0 0 syz-executor
99956 196022 82374 0 2 0 0 syz-executor
99956 373907 82374 0 3 0 0x4000080 fsleep syz-executor
43786 34994 16940 0 2 0 0 syz-executor
43786 57051 16940 0 2 0 0x4000000 syz-executor
43146 383885 73240 0 2 0 0 syz-executor
43146 86408 73240 0 3 0 0x4000080 fsleep syz-executor
26964 153930 77718 0 2 0 0 syz-executor
26964 3199 77718 0 3 0 0x4000080 fsleep syz-executor
33260 475854 14486 0 3 0 0x80 nanoslp syz-executor
33260 378361 14486 0 3 0 0x4000080 ttyout syz-executor
24400 260732 84157 0 7 0 0 syz-executor
24400 163928 84157 0 3 0 0x4000080 fsleep syz-executor
*24400 121454 84157 0 7 0 0x4000000 syz-executor
14486 460780 7901 0 3 0x2 0x80 nanoslp syz-executor
33981 162427 7901 0 3 0x2 0x80 nanoslp syz-executor
84157 478383 7901 0 3 0x2 0x80 nanoslp syz-executor
22814 458658 7901 0 2 0x2 0 syz-executor
77718 458237 7901 0 3 0x2 0x80 nanoslp syz-executor
73240 403552 7901 0 3 0x2 0x80 nanoslp syz-executor
16940 338083 7901 0 3 0x2 0x80 nanoslp syz-executor
82374 110628 7901 0 3 0x2 0x80 nanoslp syz-executor
7901 105 38065 0 3 0x2 0x80 kqread syz-executor
38065 387621 66408 0 3 0x100002 0x88 sigsusp ksh
66408 142026 17518 0 3 0x10 0x88 kqread sshd-session
17518 335550 17466 0 3 0x12 0x80 kqread sshd-session
26781 5547 1 0 3 0x100003 0x80 ttyin getty
17466 265380 1 0 3 0 0x88 kqread sshd
42572 39153 73663 74 3 0x1100012 0x80 bpf pflogd
73663 224772 1 0 3 0 0x80 sbwait pflogd
54197 380324 75920 73 3 0x1100010 0x80 kqread syslogd
75920 473005 1 0 3 0x100002 0x80 sbwait syslogd
14378 98811 1 0 3 0x100000 0x80 kqread resolvd
20945 24177 46825 77 3 0x100012 0x80 kqread dhcpleased
63655 31241 46825 77 3 0x100012 0x80 kqread dhcpleased
46825 433605 1 0 3 0 0x80 kqread dhcpleased
66597 263225 0 0 3 0x14000 0x200 bored smr
78177 383806 0 0 2 0x14000 0x200 zerothread
5071 114791 0 0 3 0x14000 0x200 aiodoned aiodoned
57636 282978 0 0 3 0x14000 0x200 syncer update
51223 464329 0 0 3 0x14000 0x200 cleaner cleaner
64915 282214 0 0 3 0x14000 0x200 reaper reaper
28151 260113 0 0 3 0x14000 0x200 pgdaemon pagedaemon
3052 34889 0 0 3 0x14000 0x200 bored viomb
9316 105648 0 0 3 0x14000 0x40000200 acpi0 acpi0
34384 481615 0 0 3 0x14000 0x40000200 idle1
3042 6256 0 0 3 0x14000 0x200 bored softnet1
30578 474108 0 0 3 0x14000 0x200 bored softnet0
52755 82552 0 0 3 0x14000 0x200 bored systqmp
1035 93081 0 0 3 0x14000 0x200 bored systq
63886 415096 0 0 3 0x14000 0x200 tmoslp softclockmp
24286 32238 0 0 3 0x14000 0x40000200 tmoslp softclock
9575 114578 0 0 3 0x14000 0x40000200 idle0
1 34029 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &pr->ps_mtx r = 0 (0xffffffff85423438)
#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 24400 (syz-executor) thread 0xffff800045ff7a10 (121454)
exclusive rwlock acctlk r = 0 (0xffffffff8518f338)
#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 (0xffffffff85439c00)
#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 (0xffffffff85423438)
#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{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11068 12390K 12503K 166960K 12180 0
pcb 17 24K 24K 166960K 20 0
rtable 238 12K 13K 166960K 362 0
pf 35 22K 28K 166960K 50 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 1489 0
iov 0 0K 4K 166960K 1 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1300 84K 84K 166960K 1381 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 17 61K 93K 166960K 154 0
proc 70 128K 193K 166960K 559 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 1 0
ISOFS mount 1 36K 36K 166960K 1 0
MSDOSFS mount 1 20K 20K 166960K 1 0
ttys 43 303K 303K 166960K 43 0
exec 0 0K 2K 166960K 395 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 218 232K 254K 166960K 3322 0
UVM aobj 3 4K 4K 166960K 3 0
pinsyscall 1066 1719K 1726K 166960K 1350 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 18 0K 2K 166960K 28 0
temp 35 9166K 9176K 166960K 4170 0
kqueue 14 41K 45K 166960K 27 0
SYN cache 2 16K 16K 166960K 2 0
ddb{0}> 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 37 0 34 1 0 1 1 0 8 0
rtentry 176 111 0 1 5 0 5 5 0 8 0
unpcb 144 48 0 31 1 0 1 1 0 8 0
syncache 336 4 0 4 2 1 1 1 0 8 1
tcpcb 736 9 0 4 1 0 1 1 0 8 0
arp 136 18 0 0 1 0 1 1 0 8 0
inpcb 328 71 0 63 1 0 1 1 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
pfrktable 1344 1 0 1 1 0 1 1 0 8 1
pfanchor 1288 1 0 0 1 0 1 1 0 8 0
pfstitem 24 24 0 0 1 0 1 1 0 8 0
pfstkey 128 24 0 0 1 0 1 1 0 8 0
pfstate 448 24 0 0 3 0 3 3 0 8 0
pfrule 1360 22 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
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1603 0 134 93 0 93 93 0 8 0
ffsino 296 1603 0 134 114 0 114 114 0 8 0
nchpl 144 1825 0 128 64 0 64 64 0 8 0
vnodes 216 1704 0 0 95 0 95 95 0 8 0
namei 1024 5652 0 5652 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 6738 0 6738 4 2 2 3 1 8 2
plimitpl 152 30 0 12 1 0 1 1 0 8 0
sigapl 424 484 0 436 7 0 7 7 0 8 1
knotepl 120 51 0 0 2 0 2 2 0 8 0
kqueuepl 224 24 0 14 1 0 1 1 0 8 0
pipepl 344 130 0 103 3 0 3 3 0 8 0
fdescpl 528 467 0 436 3 0 3 3 0 8 0
filepl 160 1667 0 1446 10 0 10 10 0 8 0
lockfpl 104 13 0 10 1 0 1 1 0 8 0
lockfspl 48 8 0 5 1 0 1 1 0 8 0
sessionpl 144 25 0 16 1 0 1 1 0 8 0
pgrppl 48 34 0 17 1 0 1 1 0 8 0
ucredpl 104 106 0 93 1 0 1 1 0 8 0
zombiepl 144 436 0 436 1 0 1 1 0 8 1
processpl 1232 484 0 436 5 0 5 5 0 8 0
procpl 664 513 0 458 5 0 5 5 0 8 0
sockpl 752 156 0 128 4 0 4 4 0 8 0
mcl64k 65536 1 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 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 117 0 0 15 0 15 15 0 8 0
mcl2k 2048 17 0 0 3 0 3 3 0 8 0
mextrefs 64 17 0 0 1 0 1 1 0 8 0
mtagpl 96 4 0 0 1 0 1 1 0 8 0
mbufpl 256 134 0 0 8 0 8 8 0 8 0
bufpl 272 2359 0 107 151 0 151 151 0 8 0
anonpl 32 3847 0 0 31 0 31 31 0 222 0
amapchunkpl 152 9049 0 8610 20 0 20 20 0 158 0
amappl16 200 1892 0 1868 5 2 3 5 0 8 0
amappl15 192 11 0 11 2 2 0 1 0 8 0
amappl14 184 448 0 446 1 0 1 1 0 8 0
amappl13 176 145 0 133 1 0 1 1 0 8 0
amappl12 168 726 0 697 2 0 2 2 0 8 0
amappl11 160 7 0 7 2 2 0 1 0 8 0
amappl10 152 76 0 62 1 0 1 1 0 8 0
amappl9 144 277 0 277 1 1 0 1 0 8 0
amappl8 136 101 0 99 1 0 1 1 0 8 0
amappl7 128 151 0 137 1 0 1 1 0 8 0
amappl6 120 163 0 161 1 0 1 1 0 8 0
amappl5 112 110 0 99 1 0 1 1 0 8 0
amappl4 104 301 0 282 1 0 1 1 0 8 0
amappl3 96 1581 0 1493 3 0 3 3 0 8 0
amappl2 88 597 0 517 2 0 2 2 0 8 0
amappl1 80 10591 0 9988 16 1 15 15 0 8 1
amappl 88 2562 0 2414 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 24 467 0 436 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 467 0 436 1 0 1 1 0 8 0
vmmpekpl 168 5947 0 5917 2 0 2 2 0 8 0
vmmpepl 168 39709 0 37820 87 0 87 87 0 357 1
vmsppl 488 466 0 436 5 0 5 5 0 8 0
rwobjpl 80 14983 0 13976 24 0 24 24 0 8 1
pdppl 4096 943 0 872 97 14 83 87 0 8 12
pvpl 32 11528 0 0 94 1 93 93 0 265 0
pmappl 256 466 0 436 3 0 3 3 0 8 0
extentpl 40 47 0 29 1 0 1 1 0 8 0
phpool 120 418 0 18 13 0 13 13 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
knote_processfork(ffffffff85423320,17f37) at knote_processfork+0x287 sys/kern/kern_event.c:2246
fork1(ffffffff85422fc0,f0,ffffffff82b481d0,0,0,ffff80003bb93e80) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff82b481d0,0,ffffffff85d6daa0,ffffffff84b32660) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800045ff7a10,ffff80003bb94260,ffff80003bb941c0) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800045ff7a10,ffff80003bb94260,ffff80003bb941c0) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff80003bb94260) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb94260) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x21afa60cab0, count: -6
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x19: leave
x86_ipi_db(ffff800028fe3ff0) 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
end of kernel
end trace frame: 0x71c08f61f770, count: 12
ddb{1}> trace
x86_ipi_db(ffff800028fe3ff0) 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
end of kernel
end trace frame: 0x71c08f61f770, count: -3