uvm_fault: witness_checkorder (5)
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syzbot
Mar 24, 2024, 10:45:25 PMMar 24
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: b9739e4cfaf4 Pull extension caching into X509_check_trust()
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=13e5b481180000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=a7fc47685a6a4310195e
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6a9029128fb2/disk-b9739e4c.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/90bd89cc4051/bsd-b9739e4c.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/744992b1e0b8/kernel-b9739e4c.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a7fc47...@syzkaller.appspotmail.com
uvm_fault(0xfffffd8008b8a700, 0x100000007, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at witness_checkorder+0x1d8: movl 0x8(%r15),%r12d
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*226492 87509 0 0x2 0x1 0K syz-executor.0
379197 94747 0 0x14000 0x200 1 reaper
witness_checkorder(ffff800000e796e8,9,0) at witness_checkorder+0x1d8 sys/kern/subr_witness.c:794
rw_enter(ffff800000e796d8,1) at rw_enter+0xd1
rwsleep(ffff800000e79878,ffff800000e796d8,118,ffffffff8294d1b9,0) at rwsleep+0xdf sys/kern/kern_synch.c:303
sosend(ffff800000e796d0,0,ffff80002a24beb8,0,0,0) at sosend+0x8d8 sys/kern/uipc_socket.c:623
fifo_write(ffff80002a24be00) at fifo_write+0x7a sys/miscfs/fifofs/fifo_vnops.c:281
VOP_WRITE(fffffd806b777cb0,ffff80002a24beb8,3,fffffd807f7d7680) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a209818,fffffd806b777cb0,fffffd807f7d7680,ffff80002a24bf80,ffff80002a24bf60) at ktrwriteraw+0x16b sys/kern/kern_ktrace.c:682
ktrsyscall(ffff80002a209818,5b,10,ffff80002a24c110) at ktrsyscall+0x293 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrsyscall(ffff80002a209818,5b,10,ffff80002a24c110) at ktrsyscall+0x293 sys/kern/kern_ktrace.c:182
syscall(ffff80002a24c110) at syscall+0x235 mi_syscall sys/sys/syscall_mi.h:155 [inline]
syscall(ffff80002a24c110) at syscall+0x235 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fb2481017d0, count: 5
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(0xfffffd8008b8a700, 0x100000007, 0, 1) -> e
ddb{0}> trace
witness_checkorder(ffff800000e796e8,9,0) at witness_checkorder+0x1d8 sys/kern/subr_witness.c:794
rw_enter(ffff800000e796d8,1) at rw_enter+0xd1
rwsleep(ffff800000e79878,ffff800000e796d8,118,ffffffff8294d1b9,0) at rwsleep+0xdf sys/kern/kern_synch.c:303
sosend(ffff800000e796d0,0,ffff80002a24beb8,0,0,0) at sosend+0x8d8 sys/kern/uipc_socket.c:623
fifo_write(ffff80002a24be00) at fifo_write+0x7a sys/miscfs/fifofs/fifo_vnops.c:281
VOP_WRITE(fffffd806b777cb0,ffff80002a24beb8,3,fffffd807f7d7680) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a209818,fffffd806b777cb0,fffffd807f7d7680,ffff80002a24bf80,ffff80002a24bf60) at ktrwriteraw+0x16b sys/kern/kern_ktrace.c:682
ktrsyscall(ffff80002a209818,5b,10,ffff80002a24c110) at ktrsyscall+0x293 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrsyscall(ffff80002a209818,5b,10,ffff80002a24c110) at ktrsyscall+0x293 sys/kern/kern_ktrace.c:182
syscall(ffff80002a24c110) at syscall+0x235 mi_syscall sys/sys/syscall_mi.h:155 [inline]
syscall(ffff80002a24c110) at syscall+0x235 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fb2481017d0, count: -10
ddb{0}> show registers
rdi 0
rsi 0x20000 acpi_pdirpa+0xbe71
rbp 0xffff80002a24bbb0
rbx 0xffff80002a209818
rdx 0
rcx 0xffff80002a209818
rax 0xffffffff82d2aff0 cpu_info_full_primary+0x1ff0
r8 0x7f7fffffc000
r9 0
r10 0x47c2504a5e5f0293
r11 0xa1ee421a98635f46
r12 0
r13 0xdeafbeaddeafbead
r14 0xffff800000e796e8
r15 0xffffffff
rip 0xffffffff8167f4e8 witness_checkorder+0x1d8
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80002a24bb00
ss 0x10
witness_checkorder+0x1d8: movl 0x8(%r15),%r12d
ddb{0}> show proc
PROC (syz-executor.0) tid=226492 pid=87509 tcnt=1 stat=onproc
flags process=2<EXEC> proc=1<INKTR>
runpri=24, usrpri=81, slppri=24, nice=20
wchan=0x0, wmesg=, ps_single=0x0
forw=0xffffffffffffffff, list=0xffff80002a209020,0xffff80002a209ad0
process=0xffff8000ffff5f20 user=0xffff80002a247000, vmspace=0xfffffd8008b8a700
estcpu=31, cpticks=2, pctcpu=0.3, user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
22799 42220 6007 0 3 0x80 nanoslp syz-executor.6
22799 97902 6007 0 3 0x4000080 fifor syz-executor.6
22799 424253 6007 0 3 0x4000080 fifor syz-executor.6
22799 92034 6007 0 3 0x4000080 fsleep syz-executor.6
61860 328190 1 0 3 0x18100083 ttyin getty
12363 244589 62032 0 3 0x82 piperd syz-executor.5
6007 239660 62032 0 3 0x82 nanoslp syz-executor.6
7651 244827 62032 0 3 0x82 piperd syz-executor.7
63520 4538 62032 0 3 0x82 piperd syz-executor.3
64066 440094 62032 0 3 0x82 piperd syz-executor.1
97562 386734 62032 0 3 0x82 piperd syz-executor.4
37002 438144 0 0 3 0x14200 bored sosplice
98637 103123 62032 0 3 0x82 piperd syz-executor.2
*87509 226492 62032 0 7 0x3 syz-executor.0
62032 229142 59313 0 3 0x1a000082 thrsleep syz-fuzzer
62032 58757 59313 0 3 0x1e000082 thrsleep syz-fuzzer
62032 408806 59313 0 3 0x1e000082 wait syz-fuzzer
62032 422240 59313 0 3 0x1e000082 wait syz-fuzzer
62032 370880 59313 0 3 0x1e000082 thrsleep syz-fuzzer
62032 155643 59313 0 3 0x1e000082 thrsleep syz-fuzzer
62032 298412 59313 0 3 0x1e000082 kqread syz-fuzzer
62032 5492 59313 0 3 0x1e000082 wait syz-fuzzer
62032 387481 59313 0 3 0x1e000082 thrsleep syz-fuzzer
62032 201852 59313 0 3 0x1e000082 wait syz-fuzzer
62032 500813 59313 0 3 0x1e000082 thrsleep syz-fuzzer
62032 54544 59313 0 3 0x1e000082 wait syz-fuzzer
62032 276260 59313 0 3 0x1e000082 thrsleep syz-fuzzer
62032 361454 59313 0 3 0x1e000082 wait syz-fuzzer
62032 139650 59313 0 3 0x1e000082 wait syz-fuzzer
62032 66573 59313 0 3 0x1e000082 wait syz-fuzzer
59313 36470 11450 0 3 0x810008a sigsusp ksh
11450 444923 54583 0 3 0x1800009a kqread sshd
54583 392844 1 0 3 0x18000088 kqread sshd
88263 33349 14627 74 3 0x19100092 bpf pflogd
14627 325043 1 0 3 0x18000080 netio pflogd
56686 84275 32173 73 3 0x19100090 kqread syslogd
32173 230770 1 0 3 0x18100082 netio syslogd
55329 494776 1 0 3 0x18100080 kqread resolvd
80393 260823 93877 77 3 0x18100092 kqread dhcpleased
80793 359559 93877 77 3 0x18100092 kqread dhcpleased
93877 175168 1 0 3 0x18000080 kqread dhcpleased
6680 230062 0 0 3 0x14200 bored smr
84736 21989 0 0 3 0x14200 pgzero zerothread
70398 367422 0 0 3 0x14200 aiodoned aiodoned
27807 312067 0 0 3 0x14200 syncer update
12807 51784 0 0 3 0x14200 cleaner cleaner
94747 379197 0 0 7 0x14200 reaper
72014 393268 0 0 3 0x14200 pgdaemon pagedaemon
74723 13466 0 0 3 0x14200 bored viomb
62297 52012 0 0 3 0x40014200 acpi0 acpi0
73269 227707 0 0 3 0x40014200 idle1
50937 390141 0 0 3 0x14200 bored softnet3
35367 102992 0 0 3 0x14200 bored softnet2
56772 150396 0 0 3 0x14200 bored softnet1
48088 53089 0 0 3 0x14200 bored softnet0
67458 298130 0 0 3 0x14200 bored systqmp
88489 150568 0 0 3 0x14200 bored systq
32573 380386 0 0 3 0x14200 tmoslp softclockmp
75790 162083 0 0 3 0x40014200 tmoslp softclock
30866 448703 0 0 3 0x40014200 idle0
1 352806 0 0 3 0x8000082 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 87509 (syz-executor.0) thread 0xffff80002a209818 (226492)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82dd0210)
#0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x446 sys/kern/subr_witness.c:1187
#1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227
#2 mi_switch+0x494 sys/kern/sched_bsd.c:470
#3 sleep_finish+0x19d sys/kern/kern_synch.c:414
#4 rwsleep+0xb3 sys/kern/kern_synch.c:300
#5 sosend+0x8d8 sys/kern/uipc_socket.c:623
#6 fifo_write+0x7a sys/miscfs/fifofs/fifo_vnops.c:281
#7 VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
#8 ktrwriteraw+0x16b sys/kern/kern_ktrace.c:682
#9 ktrsyscall+0x293 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
#9 ktrsyscall+0x293 sys/kern/kern_ktrace.c:182
#10 syscall+0x235 mi_syscall sys/sys/syscall_mi.h:155 [inline]
#10 syscall+0x235 sys/arch/amd64/amd64/trap.c:577
#11 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10225 6566K 7268K 166960K 34750 0
pcb 15 16K 18K 166960K 470 0
rtable 195 6K 7K 166960K 2941 0
pf 28 8K 10K 166960K 121 0
ifaddr 37 14K 15K 166960K 144 0
ifgroup 47 2K 2K 166960K 181 0
sysctl 3 0K 0K 166960K 3 0
counters 60 35K 36K 166960K 136 0
ioctlops 0 0K 4K 166960K 1954 0
iov 0 0K 16K 166960K 1346 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1558 98K 98K 166960K 8164 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 93 0
VM map 2 1K 1K 166960K 2 0
sem 12 1K 1K 166960K 15 0
dirhash 12 2K 2K 166960K 39 0
ACPI 1697 195K 286K 166960K 12548 0
file desc 11 37K 93K 166960K 12465 0
sigio 0 0K 0K 166960K 385 0
proc 72 91K 128K 166960K 1154 0
subproc 104 6K 6K 166960K 306 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 1754 0
in_multi 77 5K 7K 166960K 782 0
ether_multi 1 0K 0K 166960K 7 0
mrt 1 0K 0K 166960K 5 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 265 1182K 1182K 166960K 265 0
exec 0 0K 1K 166960K 894 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 411 396K 413K 166960K 123367 0
UVM aobj 131 7K 7K 166960K 162 0
pinsyscall 26 52K 108K 166960K 1801 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 171 0
NDP 10 0K 2K 166960K 102 0
temp 75 6812K 6892K 166960K 61489 0
kqueue 12 18K 24K 166960K 748 0
SYN cache 2 760K 768K 166960K 3 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 24 0 0 1 0 1 1 0 8 0
rtpcb 120 2935 0 2932 13 10 3 4 0 8 2
rtentry 112 511 0 422 4 1 3 4 0 8 0
unpcb 144 10320 0 10303 85 81 4 10 0 8 3
syncache 336 23 0 23 8 8 0 1 0 8 0
tcpqe 32 178 0 178 6 6 0 1 0 8 0
tcpcb 808 1551 0 1537 48 46 2 8 0 8 0
arp 120 116 0 102 1 0 1 1 0 8 0
inpcb 392 7870 0 7854 91 88 3 15 0 8 1
nd6 136 80 0 61 1 0 1 1 0 8 0
pkpcb 40 4 0 4 2 2 0 1 0 8 0
kcovpl 48 23 0 15 1 0 1 1 0 8 0
ppxss 1168 12 0 12 4 4 0 1 0 8 0
pffrag 232 10 0 10 5 5 0 1 0 482 0
pffrnode 88 10 0 10 5 5 0 1 0 8 0
pffrent 40 24 0 24 6 6 0 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 24 301 0 293 1 0 1 1 0 8 0
pfstkey 128 301 0 293 4 2 2 4 0 8 0
pfstate 376 301 0 293 13 11 2 12 0 8 0
pfrule 1344 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 1585 0 1212 38 11 27 30 0 8 0
art_table 32 1586 0 1212 4 0 4 4 0 8 0
art_node 16 510 0 429 1 0 1 1 0 8 0
semupl 112 12 0 12 1 1 0 1 0 8 0
semapl 112 13 0 3 1 0 1 1 0 8 0
shmpl 112 159 0 31 4 0 4 4 0 8 0
dirhash 1024 35 0 18 3 0 3 3 0 8 0
dino2pl 256 17492 0 15956 97 0 97 97 0 8 0
ffsino 272 17492 0 15956 103 0 103 103 0 8 0
nchpl 144 35504 0 33765 67 0 67 67 0 8 0
uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0
vnodes 216 5926 0 0 330 0 330 330 0 8 0
namei 1024 103938 0 103938 3 2 1 2 0 8 1
percpumem 16 82 0 38 1 0 1 1 0 8 0
vcpupl 2048 23 0 1 3 0 3 3 0 8 0
vmpool 696 32 0 10 3 0 3 3 0 8 0
kstatmem 264 96 0 76 2 0 2 2 0 8 0
scxspl 216 91995 0 91995 22 21 1 8 1 8 1
plimitpl 152 547 0 531 1 0 1 1 0 8 0
sigapl 424 12847 0 12803 12 5 7 10 0 8 0
futexpl 64 109657 0 109656 1 0 1 1 0 8 0
knotepl 120 389 0 0 11 2 9 11 0 8 0
kqueuepl 216 2838 0 2830 43 42 1 7 0 8 0
pipepl 320 1915 0 1887 46 40 6 8 0 8 3
fdescpl 496 12746 0 12722 9 5 4 5 0 8 0
filepl 152 68406 0 68163 104 89 15 24 0 8 2
lockfpl 104 2907 0 2905 4 2 2 2 0 8 1
lockfspl 48 1076 0 1074 1 0 1 1 0 8 0
sessionpl 144 43 0 26 1 0 1 1 0 8 0
pgrppl 48 153 0 136 1 0 1 1 0 8 0
ucredpl 104 13973 0 13961 1 0 1 1 0 8 0
zombiepl 144 12804 0 12803 2 1 1 1 0 8 0
processpl 1136 12847 0 12803 8 3 5 7 0 8 0
procpl 680 34478 0 34416 17 9 8 10 0 8 1
srpgc 96 29 0 29 7 7 0 1 0 8 0
sosppl 168 22 0 20 2 1 1 1 0 8 0
sockpl 584 21145 0 21109 125 117 8 20 0 8 4
mcl64k 65536 17 0 0 3 0 3 3 0 8 0
mcl16k 16384 33 0 0 5 2 3 3 0 8 0
mcl12k 12288 17 0 0 2 0 2 2 0 8 0
mcl9k 9216 16 0 0 2 0 2 2 0 8 0
mcl8k 8192 33 0 0 3 0 3 3 0 8 0
mcl4k 4096 39 0 0 5 2 3 3 0 8 0
mcl2k2 2112 17 0 0 2 0 2 2 0 8 0
mcl2k 2048 426 0 0 36 7 29 36 0 8 0
mtagpl 96 749 0 0 18 0 18 18 0 8 0
mbufpl 256 1276 0 0 62 0 62 62 0 8 0
bufpl 280 19556 0 13288 449 0 449 449 0 8 0
anonpl 24 1149364 0 1135477 141 43 98 109 0 186 0
amapchunkpl 152 386158 0 385339 64 23 41 42 0 158 2
amappl16 200 21065 0 20579 68 39 29 39 0 8 0
amappl15 192 46 0 45 1 0 1 1 0 8 0
amappl14 184 220 0 205 2 1 1 2 0 8 0
amappl13 176 9 0 9 1 1 0 1 0 8 0
amappl12 168 13661 0 13630 3 1 2 2 0 8 0
amappl11 160 70 0 56 1 0 1 1 0 8 0
amappl10 152 65 0 55 1 0 1 1 0 8 0
amappl9 144 256 0 256 4 3 1 1 0 8 1
amappl8 136 391 0 295 4 0 4 4 0 8 0
amappl7 128 104 0 88 1 0 1 1 0 8 0
amappl6 120 1237 0 1213 2 1 1 2 0 8 0
amappl5 112 459 0 444 1 0 1 1 0 8 0
amappl4 104 866 0 819 3 1 2 3 0 8 0
amappl3 96 76726 0 76651 3 0 3 3 0 8 0
amappl2 88 13924 0 13849 4 2 2 4 0 8 0
amappl1 80 53596 0 53070 23 11 12 22 0 8 0
amappl 88 122477 0 122239 8 1 7 7 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 72 161 0 31 3 0 3 3 0 8 0
uaddrrnd 24 12778 0 12731 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 12778 0 12731 1 0 1 1 0 8 0
vmmpekpl 168 94093 0 94030 5 1 4 4 0 8 0
vmmpepl 168 746027 0 743735 255 134 121 141 0 357 0
vmsppl 448 12777 0 12731 8 2 6 6 0 8 0
rwobjpl 56 183589 0 175909 121 11 110 112 0 8 0
pdppl 4096 25563 0 25484 327 236 91 92 0 8 12
pvpl 32 46248 0 0 374 1 373 373 0 265 0
pmappl 248 12777 0 12731 5 1 4 4 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 902 0 448 15 1 14 14 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
witness_checkorder(ffff800000e796e8,9,0) at witness_checkorder+0x1d8 sys/kern/subr_witness.c:794
rw_enter(ffff800000e796d8,1) at rw_enter+0xd1
rwsleep(ffff800000e79878,ffff800000e796d8,118,ffffffff8294d1b9,0) at rwsleep+0xdf sys/kern/kern_synch.c:303
sosend(ffff800000e796d0,0,ffff80002a24beb8,0,0,0) at sosend+0x8d8 sys/kern/uipc_socket.c:623
fifo_write(ffff80002a24be00) at fifo_write+0x7a sys/miscfs/fifofs/fifo_vnops.c:281
VOP_WRITE(fffffd806b777cb0,ffff80002a24beb8,3,fffffd807f7d7680) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a209818,fffffd806b777cb0,fffffd807f7d7680,ffff80002a24bf80,ffff80002a24bf60) at ktrwriteraw+0x16b sys/kern/kern_ktrace.c:682
ktrsyscall(ffff80002a209818,5b,10,ffff80002a24c110) at ktrsyscall+0x293 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrsyscall(ffff80002a209818,5b,10,ffff80002a24c110) at ktrsyscall+0x293 sys/kern/kern_ktrace.c:182
syscall(ffff80002a24c110) at syscall+0x235 mi_syscall sys/sys/syscall_mi.h:155 [inline]
syscall(ffff80002a24c110) at syscall+0x235 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fb2481017d0, count: -10
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp
x86_ipi_db(ffff800029cebff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff82dd0008) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82dd0008) at __mp_lock+0x122 sys/kern/kern_lock.c:147
reaper(ffff80002a1467f0) at reaper+0x160 sys/kern/kern_exit.c:451
end trace frame: 0x0, count: 10
ddb{1}> trace
x86_ipi_db(ffff800029cebff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff82dd0008) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82dd0008) at __mp_lock+0x122 sys/kern/kern_lock.c:147
reaper(ffff80002a1467f0) at reaper+0x160 sys/kern/kern_exit.c:451
end trace frame: 0x0, count: -5
---
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syzbot found the following issue on:
HEAD commit: b9739e4cfaf4 Pull extension caching into X509_check_trust()
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=13e5b481180000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=a7fc47685a6a4310195e
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6a9029128fb2/disk-b9739e4c.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/90bd89cc4051/bsd-b9739e4c.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/744992b1e0b8/kernel-b9739e4c.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a7fc47...@syzkaller.appspotmail.com
uvm_fault(0xfffffd8008b8a700, 0x100000007, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at witness_checkorder+0x1d8: movl 0x8(%r15),%r12d
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*226492 87509 0 0x2 0x1 0K syz-executor.0
379197 94747 0 0x14000 0x200 1 reaper
witness_checkorder(ffff800000e796e8,9,0) at witness_checkorder+0x1d8 sys/kern/subr_witness.c:794
rw_enter(ffff800000e796d8,1) at rw_enter+0xd1
rwsleep(ffff800000e79878,ffff800000e796d8,118,ffffffff8294d1b9,0) at rwsleep+0xdf sys/kern/kern_synch.c:303
sosend(ffff800000e796d0,0,ffff80002a24beb8,0,0,0) at sosend+0x8d8 sys/kern/uipc_socket.c:623
fifo_write(ffff80002a24be00) at fifo_write+0x7a sys/miscfs/fifofs/fifo_vnops.c:281
VOP_WRITE(fffffd806b777cb0,ffff80002a24beb8,3,fffffd807f7d7680) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a209818,fffffd806b777cb0,fffffd807f7d7680,ffff80002a24bf80,ffff80002a24bf60) at ktrwriteraw+0x16b sys/kern/kern_ktrace.c:682
ktrsyscall(ffff80002a209818,5b,10,ffff80002a24c110) at ktrsyscall+0x293 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrsyscall(ffff80002a209818,5b,10,ffff80002a24c110) at ktrsyscall+0x293 sys/kern/kern_ktrace.c:182
syscall(ffff80002a24c110) at syscall+0x235 mi_syscall sys/sys/syscall_mi.h:155 [inline]
syscall(ffff80002a24c110) at syscall+0x235 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fb2481017d0, count: 5
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(0xfffffd8008b8a700, 0x100000007, 0, 1) -> e
ddb{0}> trace
witness_checkorder(ffff800000e796e8,9,0) at witness_checkorder+0x1d8 sys/kern/subr_witness.c:794
rw_enter(ffff800000e796d8,1) at rw_enter+0xd1
rwsleep(ffff800000e79878,ffff800000e796d8,118,ffffffff8294d1b9,0) at rwsleep+0xdf sys/kern/kern_synch.c:303
sosend(ffff800000e796d0,0,ffff80002a24beb8,0,0,0) at sosend+0x8d8 sys/kern/uipc_socket.c:623
fifo_write(ffff80002a24be00) at fifo_write+0x7a sys/miscfs/fifofs/fifo_vnops.c:281
VOP_WRITE(fffffd806b777cb0,ffff80002a24beb8,3,fffffd807f7d7680) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a209818,fffffd806b777cb0,fffffd807f7d7680,ffff80002a24bf80,ffff80002a24bf60) at ktrwriteraw+0x16b sys/kern/kern_ktrace.c:682
ktrsyscall(ffff80002a209818,5b,10,ffff80002a24c110) at ktrsyscall+0x293 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrsyscall(ffff80002a209818,5b,10,ffff80002a24c110) at ktrsyscall+0x293 sys/kern/kern_ktrace.c:182
syscall(ffff80002a24c110) at syscall+0x235 mi_syscall sys/sys/syscall_mi.h:155 [inline]
syscall(ffff80002a24c110) at syscall+0x235 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fb2481017d0, count: -10
ddb{0}> show registers
rdi 0
rsi 0x20000 acpi_pdirpa+0xbe71
rbp 0xffff80002a24bbb0
rbx 0xffff80002a209818
rdx 0
rcx 0xffff80002a209818
rax 0xffffffff82d2aff0 cpu_info_full_primary+0x1ff0
r8 0x7f7fffffc000
r9 0
r10 0x47c2504a5e5f0293
r11 0xa1ee421a98635f46
r12 0
r13 0xdeafbeaddeafbead
r14 0xffff800000e796e8
r15 0xffffffff
rip 0xffffffff8167f4e8 witness_checkorder+0x1d8
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80002a24bb00
ss 0x10
witness_checkorder+0x1d8: movl 0x8(%r15),%r12d
ddb{0}> show proc
PROC (syz-executor.0) tid=226492 pid=87509 tcnt=1 stat=onproc
flags process=2<EXEC> proc=1<INKTR>
runpri=24, usrpri=81, slppri=24, nice=20
wchan=0x0, wmesg=, ps_single=0x0
forw=0xffffffffffffffff, list=0xffff80002a209020,0xffff80002a209ad0
process=0xffff8000ffff5f20 user=0xffff80002a247000, vmspace=0xfffffd8008b8a700
estcpu=31, cpticks=2, pctcpu=0.3, user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
22799 42220 6007 0 3 0x80 nanoslp syz-executor.6
22799 97902 6007 0 3 0x4000080 fifor syz-executor.6
22799 424253 6007 0 3 0x4000080 fifor syz-executor.6
22799 92034 6007 0 3 0x4000080 fsleep syz-executor.6
61860 328190 1 0 3 0x18100083 ttyin getty
12363 244589 62032 0 3 0x82 piperd syz-executor.5
6007 239660 62032 0 3 0x82 nanoslp syz-executor.6
7651 244827 62032 0 3 0x82 piperd syz-executor.7
63520 4538 62032 0 3 0x82 piperd syz-executor.3
64066 440094 62032 0 3 0x82 piperd syz-executor.1
97562 386734 62032 0 3 0x82 piperd syz-executor.4
37002 438144 0 0 3 0x14200 bored sosplice
98637 103123 62032 0 3 0x82 piperd syz-executor.2
*87509 226492 62032 0 7 0x3 syz-executor.0
62032 229142 59313 0 3 0x1a000082 thrsleep syz-fuzzer
62032 58757 59313 0 3 0x1e000082 thrsleep syz-fuzzer
62032 408806 59313 0 3 0x1e000082 wait syz-fuzzer
62032 422240 59313 0 3 0x1e000082 wait syz-fuzzer
62032 370880 59313 0 3 0x1e000082 thrsleep syz-fuzzer
62032 155643 59313 0 3 0x1e000082 thrsleep syz-fuzzer
62032 298412 59313 0 3 0x1e000082 kqread syz-fuzzer
62032 5492 59313 0 3 0x1e000082 wait syz-fuzzer
62032 387481 59313 0 3 0x1e000082 thrsleep syz-fuzzer
62032 201852 59313 0 3 0x1e000082 wait syz-fuzzer
62032 500813 59313 0 3 0x1e000082 thrsleep syz-fuzzer
62032 54544 59313 0 3 0x1e000082 wait syz-fuzzer
62032 276260 59313 0 3 0x1e000082 thrsleep syz-fuzzer
62032 361454 59313 0 3 0x1e000082 wait syz-fuzzer
62032 139650 59313 0 3 0x1e000082 wait syz-fuzzer
62032 66573 59313 0 3 0x1e000082 wait syz-fuzzer
59313 36470 11450 0 3 0x810008a sigsusp ksh
11450 444923 54583 0 3 0x1800009a kqread sshd
54583 392844 1 0 3 0x18000088 kqread sshd
88263 33349 14627 74 3 0x19100092 bpf pflogd
14627 325043 1 0 3 0x18000080 netio pflogd
56686 84275 32173 73 3 0x19100090 kqread syslogd
32173 230770 1 0 3 0x18100082 netio syslogd
55329 494776 1 0 3 0x18100080 kqread resolvd
80393 260823 93877 77 3 0x18100092 kqread dhcpleased
80793 359559 93877 77 3 0x18100092 kqread dhcpleased
93877 175168 1 0 3 0x18000080 kqread dhcpleased
6680 230062 0 0 3 0x14200 bored smr
84736 21989 0 0 3 0x14200 pgzero zerothread
70398 367422 0 0 3 0x14200 aiodoned aiodoned
27807 312067 0 0 3 0x14200 syncer update
12807 51784 0 0 3 0x14200 cleaner cleaner
94747 379197 0 0 7 0x14200 reaper
72014 393268 0 0 3 0x14200 pgdaemon pagedaemon
74723 13466 0 0 3 0x14200 bored viomb
62297 52012 0 0 3 0x40014200 acpi0 acpi0
73269 227707 0 0 3 0x40014200 idle1
50937 390141 0 0 3 0x14200 bored softnet3
35367 102992 0 0 3 0x14200 bored softnet2
56772 150396 0 0 3 0x14200 bored softnet1
48088 53089 0 0 3 0x14200 bored softnet0
67458 298130 0 0 3 0x14200 bored systqmp
88489 150568 0 0 3 0x14200 bored systq
32573 380386 0 0 3 0x14200 tmoslp softclockmp
75790 162083 0 0 3 0x40014200 tmoslp softclock
30866 448703 0 0 3 0x40014200 idle0
1 352806 0 0 3 0x8000082 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 87509 (syz-executor.0) thread 0xffff80002a209818 (226492)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82dd0210)
#0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x446 sys/kern/subr_witness.c:1187
#1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227
#2 mi_switch+0x494 sys/kern/sched_bsd.c:470
#3 sleep_finish+0x19d sys/kern/kern_synch.c:414
#4 rwsleep+0xb3 sys/kern/kern_synch.c:300
#5 sosend+0x8d8 sys/kern/uipc_socket.c:623
#6 fifo_write+0x7a sys/miscfs/fifofs/fifo_vnops.c:281
#7 VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
#8 ktrwriteraw+0x16b sys/kern/kern_ktrace.c:682
#9 ktrsyscall+0x293 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
#9 ktrsyscall+0x293 sys/kern/kern_ktrace.c:182
#10 syscall+0x235 mi_syscall sys/sys/syscall_mi.h:155 [inline]
#10 syscall+0x235 sys/arch/amd64/amd64/trap.c:577
#11 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10225 6566K 7268K 166960K 34750 0
pcb 15 16K 18K 166960K 470 0
rtable 195 6K 7K 166960K 2941 0
pf 28 8K 10K 166960K 121 0
ifaddr 37 14K 15K 166960K 144 0
ifgroup 47 2K 2K 166960K 181 0
sysctl 3 0K 0K 166960K 3 0
counters 60 35K 36K 166960K 136 0
ioctlops 0 0K 4K 166960K 1954 0
iov 0 0K 16K 166960K 1346 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1558 98K 98K 166960K 8164 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 93 0
VM map 2 1K 1K 166960K 2 0
sem 12 1K 1K 166960K 15 0
dirhash 12 2K 2K 166960K 39 0
ACPI 1697 195K 286K 166960K 12548 0
file desc 11 37K 93K 166960K 12465 0
sigio 0 0K 0K 166960K 385 0
proc 72 91K 128K 166960K 1154 0
subproc 104 6K 6K 166960K 306 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 1754 0
in_multi 77 5K 7K 166960K 782 0
ether_multi 1 0K 0K 166960K 7 0
mrt 1 0K 0K 166960K 5 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 265 1182K 1182K 166960K 265 0
exec 0 0K 1K 166960K 894 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 411 396K 413K 166960K 123367 0
UVM aobj 131 7K 7K 166960K 162 0
pinsyscall 26 52K 108K 166960K 1801 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 171 0
NDP 10 0K 2K 166960K 102 0
temp 75 6812K 6892K 166960K 61489 0
kqueue 12 18K 24K 166960K 748 0
SYN cache 2 760K 768K 166960K 3 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 24 0 0 1 0 1 1 0 8 0
rtpcb 120 2935 0 2932 13 10 3 4 0 8 2
rtentry 112 511 0 422 4 1 3 4 0 8 0
unpcb 144 10320 0 10303 85 81 4 10 0 8 3
syncache 336 23 0 23 8 8 0 1 0 8 0
tcpqe 32 178 0 178 6 6 0 1 0 8 0
tcpcb 808 1551 0 1537 48 46 2 8 0 8 0
arp 120 116 0 102 1 0 1 1 0 8 0
inpcb 392 7870 0 7854 91 88 3 15 0 8 1
nd6 136 80 0 61 1 0 1 1 0 8 0
pkpcb 40 4 0 4 2 2 0 1 0 8 0
kcovpl 48 23 0 15 1 0 1 1 0 8 0
ppxss 1168 12 0 12 4 4 0 1 0 8 0
pffrag 232 10 0 10 5 5 0 1 0 482 0
pffrnode 88 10 0 10 5 5 0 1 0 8 0
pffrent 40 24 0 24 6 6 0 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 24 301 0 293 1 0 1 1 0 8 0
pfstkey 128 301 0 293 4 2 2 4 0 8 0
pfstate 376 301 0 293 13 11 2 12 0 8 0
pfrule 1344 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 1585 0 1212 38 11 27 30 0 8 0
art_table 32 1586 0 1212 4 0 4 4 0 8 0
art_node 16 510 0 429 1 0 1 1 0 8 0
semupl 112 12 0 12 1 1 0 1 0 8 0
semapl 112 13 0 3 1 0 1 1 0 8 0
shmpl 112 159 0 31 4 0 4 4 0 8 0
dirhash 1024 35 0 18 3 0 3 3 0 8 0
dino2pl 256 17492 0 15956 97 0 97 97 0 8 0
ffsino 272 17492 0 15956 103 0 103 103 0 8 0
nchpl 144 35504 0 33765 67 0 67 67 0 8 0
uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0
vnodes 216 5926 0 0 330 0 330 330 0 8 0
namei 1024 103938 0 103938 3 2 1 2 0 8 1
percpumem 16 82 0 38 1 0 1 1 0 8 0
vcpupl 2048 23 0 1 3 0 3 3 0 8 0
vmpool 696 32 0 10 3 0 3 3 0 8 0
kstatmem 264 96 0 76 2 0 2 2 0 8 0
scxspl 216 91995 0 91995 22 21 1 8 1 8 1
plimitpl 152 547 0 531 1 0 1 1 0 8 0
sigapl 424 12847 0 12803 12 5 7 10 0 8 0
futexpl 64 109657 0 109656 1 0 1 1 0 8 0
knotepl 120 389 0 0 11 2 9 11 0 8 0
kqueuepl 216 2838 0 2830 43 42 1 7 0 8 0
pipepl 320 1915 0 1887 46 40 6 8 0 8 3
fdescpl 496 12746 0 12722 9 5 4 5 0 8 0
filepl 152 68406 0 68163 104 89 15 24 0 8 2
lockfpl 104 2907 0 2905 4 2 2 2 0 8 1
lockfspl 48 1076 0 1074 1 0 1 1 0 8 0
sessionpl 144 43 0 26 1 0 1 1 0 8 0
pgrppl 48 153 0 136 1 0 1 1 0 8 0
ucredpl 104 13973 0 13961 1 0 1 1 0 8 0
zombiepl 144 12804 0 12803 2 1 1 1 0 8 0
processpl 1136 12847 0 12803 8 3 5 7 0 8 0
procpl 680 34478 0 34416 17 9 8 10 0 8 1
srpgc 96 29 0 29 7 7 0 1 0 8 0
sosppl 168 22 0 20 2 1 1 1 0 8 0
sockpl 584 21145 0 21109 125 117 8 20 0 8 4
mcl64k 65536 17 0 0 3 0 3 3 0 8 0
mcl16k 16384 33 0 0 5 2 3 3 0 8 0
mcl12k 12288 17 0 0 2 0 2 2 0 8 0
mcl9k 9216 16 0 0 2 0 2 2 0 8 0
mcl8k 8192 33 0 0 3 0 3 3 0 8 0
mcl4k 4096 39 0 0 5 2 3 3 0 8 0
mcl2k2 2112 17 0 0 2 0 2 2 0 8 0
mcl2k 2048 426 0 0 36 7 29 36 0 8 0
mtagpl 96 749 0 0 18 0 18 18 0 8 0
mbufpl 256 1276 0 0 62 0 62 62 0 8 0
bufpl 280 19556 0 13288 449 0 449 449 0 8 0
anonpl 24 1149364 0 1135477 141 43 98 109 0 186 0
amapchunkpl 152 386158 0 385339 64 23 41 42 0 158 2
amappl16 200 21065 0 20579 68 39 29 39 0 8 0
amappl15 192 46 0 45 1 0 1 1 0 8 0
amappl14 184 220 0 205 2 1 1 2 0 8 0
amappl13 176 9 0 9 1 1 0 1 0 8 0
amappl12 168 13661 0 13630 3 1 2 2 0 8 0
amappl11 160 70 0 56 1 0 1 1 0 8 0
amappl10 152 65 0 55 1 0 1 1 0 8 0
amappl9 144 256 0 256 4 3 1 1 0 8 1
amappl8 136 391 0 295 4 0 4 4 0 8 0
amappl7 128 104 0 88 1 0 1 1 0 8 0
amappl6 120 1237 0 1213 2 1 1 2 0 8 0
amappl5 112 459 0 444 1 0 1 1 0 8 0
amappl4 104 866 0 819 3 1 2 3 0 8 0
amappl3 96 76726 0 76651 3 0 3 3 0 8 0
amappl2 88 13924 0 13849 4 2 2 4 0 8 0
amappl1 80 53596 0 53070 23 11 12 22 0 8 0
amappl 88 122477 0 122239 8 1 7 7 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 72 161 0 31 3 0 3 3 0 8 0
uaddrrnd 24 12778 0 12731 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 12778 0 12731 1 0 1 1 0 8 0
vmmpekpl 168 94093 0 94030 5 1 4 4 0 8 0
vmmpepl 168 746027 0 743735 255 134 121 141 0 357 0
vmsppl 448 12777 0 12731 8 2 6 6 0 8 0
rwobjpl 56 183589 0 175909 121 11 110 112 0 8 0
pdppl 4096 25563 0 25484 327 236 91 92 0 8 12
pvpl 32 46248 0 0 374 1 373 373 0 265 0
pmappl 248 12777 0 12731 5 1 4 4 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 902 0 448 15 1 14 14 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
witness_checkorder(ffff800000e796e8,9,0) at witness_checkorder+0x1d8 sys/kern/subr_witness.c:794
rw_enter(ffff800000e796d8,1) at rw_enter+0xd1
rwsleep(ffff800000e79878,ffff800000e796d8,118,ffffffff8294d1b9,0) at rwsleep+0xdf sys/kern/kern_synch.c:303
sosend(ffff800000e796d0,0,ffff80002a24beb8,0,0,0) at sosend+0x8d8 sys/kern/uipc_socket.c:623
fifo_write(ffff80002a24be00) at fifo_write+0x7a sys/miscfs/fifofs/fifo_vnops.c:281
VOP_WRITE(fffffd806b777cb0,ffff80002a24beb8,3,fffffd807f7d7680) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a209818,fffffd806b777cb0,fffffd807f7d7680,ffff80002a24bf80,ffff80002a24bf60) at ktrwriteraw+0x16b sys/kern/kern_ktrace.c:682
ktrsyscall(ffff80002a209818,5b,10,ffff80002a24c110) at ktrsyscall+0x293 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrsyscall(ffff80002a209818,5b,10,ffff80002a24c110) at ktrsyscall+0x293 sys/kern/kern_ktrace.c:182
syscall(ffff80002a24c110) at syscall+0x235 mi_syscall sys/sys/syscall_mi.h:155 [inline]
syscall(ffff80002a24c110) at syscall+0x235 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fb2481017d0, count: -10
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp
x86_ipi_db(ffff800029cebff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff82dd0008) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82dd0008) at __mp_lock+0x122 sys/kern/kern_lock.c:147
reaper(ffff80002a1467f0) at reaper+0x160 sys/kern/kern_exit.c:451
end trace frame: 0x0, count: 10
ddb{1}> trace
x86_ipi_db(ffff800029cebff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff82dd0008) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82dd0008) at __mp_lock+0x122 sys/kern/kern_lock.c:147
reaper(ffff80002a1467f0) at reaper+0x160 sys/kern/kern_exit.c:451
end trace frame: 0x0, count: -5
---
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