KASAN: invalid memory access in shm_delete_mapping
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syzbot
Jul 23, 2026, 8:15:23 PM (4 days ago) Jul 23
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 7c61c2d2eaf2 Fix checkalias contract to register the vnode..
git tree: https://github.com/blackgnezdo/openbsd-src.git syzbot-kasan
console output: https://syzkaller.appspot.com/x/log.txt?x=126d0dd0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=85e25e37d09e1b88
dashboard link: https://syzkaller.appspot.com/bug?extid=f2c08abe216302bc63d6
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0f6409b719e5/disk-7c61c2d2.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/645cca046c7d/bsd-7c61c2d2.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/daa40b48d8c6/kernel-7c61c2d2.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f2c08a...@syzkaller.appspotmail.com
panic: Caught invalid memory access at ffff800001d3c350 size 8 op 1
Stopped at db_enter+0x17: popq %rbp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
180923 91010 0 0 0 1 syz-executor
*182023 91010 0 0 0x4000000 0K syz-executor
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84636510) at panic+0x270 sys/kern/subr_prf.c:198
__asan_store8_noabort(ffff800001d3c350) at __asan_store8_noabort+0xe4 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
__asan_store8_noabort(ffff800001d3c350) at __asan_store8_noabort+0xe4 sys/kern/subr_kasan.c:1099
shm_delete_mapping(ffff800001c8d020,ffff800001cbf008) at shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183
syscall(ffff80003bb88180) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb88180) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfdc0788ba60, 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: Caught invalid memory access at ffff800001d3c350 size 8 op 1
ddb{0}> show kasan
KASAN: invalid write of 8 bytes at 0xffff800001d3c350 from pc 0xffffffff81dc0ec9
KASAN: first bad byte at 0xffff800001d3c350 (+0); shadow 0xfd: pool use-after-free (or unallocated item)
KASAN: 0xffff800001d3c350 is 64 bytes inside the 112-byte item [0xffff800001d3c310..0xffff800001d3c380) in pool 'shmpl'
KASAN: allocated at:
#0 pool_get+0x770 sys/kern/subr_pool.c:733
#1 shmget_allocate_segment+0x23b sys/kern/sysv_shm.c:-1
#2 sys_shmget+0x260 sys/kern/sysv_shm.c:503
#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
KASAN: freed at:
#0 pool_put+0x79 sys/kern/subr_pool.c:918
#1 shm_deallocate_segment+0x85 sys/kern/sysv_shm.c:159
#2 sys_shmctl+0x51e sys/kern/sysv_shm.c:366
#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
KASAN: pc: shm_delete_mapping+0x1f9
KASAN: call trace:
#0 __asan_store8_noabort+0xc0 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
#0 __asan_store8_noabort+0xc0 sys/kern/subr_kasan.c:1099
#1 shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183
#2 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#2 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#3 Xsyscall+0x128
KASAN: shadow of 0xffff800001d3c200..0xffff800001d3c480 (1 cell = 8 bytes):
0xffff800001d3c200: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
0xffff800001d3c280: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
>0xffff800001d3c300: 08 08 08 08 fd fd fd fd fd fd[fd]fd fd fd fd fd
0xffff800001d3c380: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
0xffff800001d3c400: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
KASAN: legend: 00 valid; 01..07 partial; fb malloc redzone; fc malloc freed; fd pool freed; fe kmem; fa global; f1..f4/f8 stack/scope
ddb{0}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84636510) at panic+0x270 sys/kern/subr_prf.c:198
__asan_store8_noabort(ffff800001d3c350) at __asan_store8_noabort+0xe4 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
__asan_store8_noabort(ffff800001d3c350) at __asan_store8_noabort+0xe4 sys/kern/subr_kasan.c:1099
shm_delete_mapping(ffff800001c8d020,ffff800001cbf008) at shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183
syscall(ffff80003bb88180) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb88180) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfdc0788ba60, count: -6
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff80003bb87e30
rbx 0xffff80003bb87ea0
rdx 0
rcx 0xffffffff851c3ff0 cpu_info_full_primary+0x1ff0
rax 0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xffff80003bb87c18
r11 0xffffffff831c6730 x86_bus_space_io_read_1
r12 0xffffffff84636510 __rodata_start+0x9e510
r13 0xffffffff851c4c08 cpu_info_full_primary+0x2c08
r14 0xffffffff851c4e07 cpu_info_full_primary+0x2e07
r15 0x1
rip 0xffffffff82e89947 db_enter+0x17
cs 0x8
rflags 0x246
rsp 0xffff80003bb87e30
ss 0x10
db_enter+0x17: popq %rbp
ddb{0}> show proc
PROC (syz-executor) tid=182023 pid=91010 tcnt=3 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045ff5250,0xffffffff854dd080
process=0xffff800045ff39e0 user=0xffff80003bb7d000, vmspace=0xffff800001c8d020
estcpu=36, cpticks=17, pctcpu=0.0, user=0, sys=17, intr=0
ddb{0}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
91010 180923 6552 0 7 0 0 syz-executor
91010 390121 6552 0 2 0 0x4000080 syz-executor
*91010 182023 6552 0 7 0 0x4000000 syz-executor
61276 345869 15617 0 2 0 0xc80 syz-executor
61276 370393 15617 0 3 0 0x4000080 ttyin syz-executor
61276 141593 15617 0 3 0 0x4000080 fsleep syz-executor
32411 20053 98178 0 2 0 0xc80 syz-executor
32411 236544 98178 0 3 0 0x4000080 kqsel syz-executor
32411 363772 98178 0 3 0 0x4000080 fsleep syz-executor
65966 187106 40364 0 2 0 0xc80 syz-executor
65966 521293 40364 0 3 0 0x4000080 netcon syz-executor
65966 117835 40364 0 3 0 0x4000080 fsleep syz-executor
77655 296369 0 0 3 0x14000 0x200 acct acct
6552 296665 52957 0 2 0x2 0xc80 syz-executor
40364 211302 52957 0 2 0x2 0xc80 syz-executor
73598 465837 1 0 3 0x100003 0x80 ttyin getty
16819 7876 90784 0 3 0x100002 0x80 sbwait arp
90784 153772 70318 0 3 0x100002 0x88 sigsusp sh
43493 82923 52957 0 2 0x2 0xc80 syz-executor
15617 411934 52957 0 2 0x2 0xc80 syz-executor
28496 476855 52957 0 3 0x2 0x80 wait syz-executor
98178 405059 52957 0 2 0x2 0xc80 syz-executor
33174 146350 52957 0 3 0x2 0x80 wait syz-executor
70318 161346 52957 0 3 0x2 0x80 wait syz-executor
52957 421625 35039 0 3 0x2 0x80 kqread syz-executor
35039 367919 61396 0 3 0x100002 0x88 sigsusp ksh
61396 445718 74228 0 3 0x10 0x88 kqread sshd-session
74228 297372 84328 0 3 0x12 0x80 kqread sshd-session
84328 38302 1 0 3 0 0x88 kqread sshd
50239 453627 32453 74 3 0x1100012 0x80 bpf pflogd
32453 6857 1 0 3 0 0x80 sbwait pflogd
34705 415223 24261 73 2 0x1100010 0x80 syslogd
24261 271325 1 0 3 0x100002 0x80 sbwait syslogd
55748 488373 1 0 3 0x100000 0x80 kqread resolvd
59810 173023 65141 77 3 0x100012 0x80 kqread dhcpleased
80424 331461 65141 77 3 0x100012 0x80 kqread dhcpleased
65141 188585 1 0 3 0 0x80 kqread dhcpleased
65492 74 0 0 3 0x14000 0x200 bored smr
71637 310210 0 0 3 0x14000 0x200 pgzero zerothread
6487 462881 0 0 3 0x14000 0x200 aiodoned aiodoned
11933 123414 0 0 3 0x14000 0x200 syncer update
3905 235678 0 0 3 0x14000 0x200 cleaner cleaner
26809 454871 0 0 3 0x14000 0x200 reaper reaper
52219 514923 0 0 3 0x14000 0x200 pgdaemon pagedaemon
25717 329400 0 0 3 0x14000 0x200 bored viomb
21267 58730 0 0 3 0x14000 0x40000200 acpi0 acpi0
47113 62043 0 0 3 0x14000 0x40000200 idle1
8697 433034 0 0 3 0x14000 0x200 bored softnet1
58959 272223 0 0 2 0x14000 0x200 softnet0
6495 89787 0 0 3 0x14000 0x200 bored systqmp
42041 18057 0 0 3 0x14000 0x200 bored systq
46131 478194 0 0 3 0x14000 0x200 tmoslp softclockmp
13707 57334 0 0 3 0x14000 0x40000200 tmoslp softclock
21213 433192 0 0 3 0x14000 0x40000200 idle0
1 83705 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{0}> show all locks
Process 91010 (syz-executor) thread 0xffff800045ff5a18 (182023)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff85435b40)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:-1
#2 sleep_finish+0x423 sys/kern/kern_synch.c:369
#3 rw_do_enter_write+0x21f sys/kern/kern_rwlock.c:298
#4 vm_map_lock_ln+0x19f sys/uvm/uvm_map.c:5170
#5 uvm_unmap+0xc9 sys/uvm/uvm_map.c:1798
#6 shm_delete_mapping+0x1bd sys/kern/sysv_shm.c:182
#7 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#7 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#8 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11047 12243K 12411K 166960K 12293 0
pcb 18 26K 27K 166960K 55 0
rtable 135 7K 12K 166960K 393 0
pf 26 20K 36K 166960K 62 0
ifaddr 25 6K 11K 166960K 57 0
ifgroup 39 1K 2K 166960K 73 0
sysctl 3 1K 13K 166960K 11 0
counters 62 40K 42K 166960K 82 0
ioctlops 0 0K 4K 166960K 1668 0
iov 0 0K 16K 166960K 9 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1299 84K 84K 166960K 1530 0
UFS quota 1 36K 36K 166960K 1 0
UFS mount 5 44K 44K 166960K 5 0
shm 4 10K 10K 166960K 14 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 1K 166960K 17 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 292K 166960K 11964 0
file desc 19 69K 97K 166960K 436 0
sigio 0 0K 0K 166960K 5 0
proc 80 145K 193K 166960K 658 0
subproc 72 9K 9K 166960K 90 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 20K 20K 166960K 1 0
ip_moptions 0 0K 0K 166960K 14 0
in_multi 45 3K 6K 166960K 111 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 13 0
ISOFS mount 1 36K 36K 166960K 1 0
MSDOSFS mount 1 20K 20K 166960K 1 0
ttys 73 506K 506K 166960K 73 0
exec 0 0K 2K 166960K 415 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 252 225K 245K 166960K 5807 0
UVM aobj 85 13K 13K 166960K 87 0
pinsyscall 1069 1846K 1846K 166960K 1642 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 2 0
NDP 8 0K 1K 166960K 36 0
temp 39 9167K 9186K 166960K 9824 0
kqueue 15 48K 52K 166960K 72 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 39 0 35 1 0 1 1 0 8 0
rtentry 176 127 0 68 5 0 5 5 0 8 0
unpcb 144 424 0 401 4 0 4 4 0 8 3
syncache 336 4 0 4 1 1 0 1 0 8 0
tcpcb 736 66 0 61 3 0 3 3 0 8 2
arp 136 21 0 12 1 0 1 1 0 8 0
inpcb 328 397 0 388 5 2 3 4 0 8 2
ip6q 72 1 0 0 1 0 1 1 0 8 0
ip6af 40 1 0 0 1 0 1 1 0 8 0
nd6 152 29 0 19 1 0 1 1 0 8 0
kcovpl 48 10 0 2 1 0 1 1 0 8 0
ppxss 1192 3 0 3 1 0 1 1 0 8 1
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 19 0 3 1 0 1 1 0 8 0
pfstkey 128 19 0 3 1 0 1 1 0 8 0
pfstate 448 19 0 3 3 0 3 3 0 8 0
pfrule 1360 23 0 18 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 506 0 266 26 2 24 26 0 8 4
art_table 40 507 0 266 5 0 5 5 0 8 1
art_node 32 127 0 73 1 0 1 1 0 8 0
sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0
semapl 72 14 0 4 1 0 1 1 0 8 0
shmpl 112 84 0 2 3 0 3 3 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 2050 0 577 93 0 93 93 0 8 0
ffsino 296 2050 0 577 114 0 114 114 0 8 0
nchpl 144 2663 0 951 64 0 64 64 0 8 0
vnodes 216 2228 0 0 124 0 124 124 0 8 0
namei 1024 8824 0 8824 1 0 1 1 0 8 1
percpumem 16 57 0 10 1 0 1 1 0 8 0
kstatmem 264 39 0 20 2 0 2 2 0 8 0
scxspl 216 9539 0 9539 10 7 3 8 1 8 3
plimitpl 152 46 0 28 1 0 1 1 0 8 0
sigapl 424 752 0 702 7 0 7 7 0 8 0
knotepl 120 111 0 0 4 0 4 4 0 8 0
kqueuepl 224 139 0 127 3 2 1 3 0 8 0
pipepl 344 188 0 161 3 0 3 3 0 8 0
fdescpl 528 735 0 702 3 0 3 3 0 8 0
filepl 160 3799 0 3569 15 2 13 13 0 8 3
lockfpl 104 146 0 144 1 0 1 1 0 8 0
lockfspl 48 58 0 56 1 0 1 1 0 8 0
sessionpl 144 38 0 29 1 0 1 1 0 8 0
pgrppl 48 49 0 32 1 0 1 1 0 8 0
ucredpl 104 340 0 325 1 0 1 1 0 8 0
zombiepl 144 705 0 702 1 0 1 1 0 8 0
processpl 1232 752 0 702 5 0 5 5 0 8 0
procpl 664 1231 0 1173 6 0 6 6 0 8 0
sosppl 176 4 0 4 1 0 1 1 0 8 1
sockpl 752 865 0 829 13 2 11 11 0 8 7
mcl64k 65536 9 0 0 2 0 2 2 0 8 0
mcl16k 16384 2 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k128 9344 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 124 0 0 16 0 16 16 0 8 0
mcl2k 2048 26 0 0 4 0 4 4 0 8 0
mextrefs 64 31 0 0 1 0 1 1 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 251 0 0 16 0 16 16 0 8 0
bufpl 272 2996 0 107 193 0 193 193 0 8 0
anonpl 32 7506 0 0 61 0 61 61 0 222 0
amapchunkpl 152 16928 0 16407 23 1 22 22 0 158 1
amappl16 200 2255 0 2228 16 6 10 14 0 8 6
amappl15 192 8 0 8 2 2 0 1 0 8 0
amappl14 184 450 0 448 1 0 1 1 0 8 0
amappl13 176 136 0 123 1 0 1 1 0 8 0
amappl12 168 991 0 959 2 0 2 2 0 8 0
amappl11 160 8 0 7 1 0 1 1 0 8 0
amappl10 152 67 0 52 1 0 1 1 0 8 0
amappl9 144 273 0 272 1 0 1 1 0 8 0
amappl8 136 111 0 108 1 0 1 1 0 8 0
amappl7 128 154 0 140 1 0 1 1 0 8 0
amappl6 120 174 0 171 1 0 1 1 0 8 0
amappl5 112 106 0 96 1 0 1 1 0 8 0
amappl4 104 311 0 291 1 0 1 1 0 8 0
amappl3 96 3383 0 3258 4 0 4 4 0 8 0
amappl2 88 579 0 512 2 0 2 2 0 8 0
amappl1 80 11735 0 11101 16 1 15 16 0 8 0
amappl 88 5007 0 4831 5 0 5 5 0 92 0
uvmvnodes 80 113 0 0 3 0 3 3 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 86 0 2 2 0 2 2 0 8 0
uaddrrnd 24 735 0 702 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 735 0 702 1 0 1 1 0 8 0
vmmpekpl 168 8057 0 8024 3 0 3 3 0 8 0
vmmpepl 168 55135 0 53118 97 2 95 97 0 357 6
vmsppl 488 734 0 702 5 0 5 5 0 8 0
rwobjpl 80 18205 0 17016 28 2 26 27 0 8 0
pdppl 4096 1479 0 1404 105 28 77 89 0 8 2
pvpl 32 14421 0 0 117 0 117 117 0 265 0
pmappl 256 734 0 702 3 0 3 3 0 8 0
extentpl 40 47 0 29 1 0 1 1 0 8 0
phpool 120 477 0 34 14 0 14 14 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84636510) at panic+0x270 sys/kern/subr_prf.c:198
__asan_store8_noabort(ffff800001d3c350) at __asan_store8_noabort+0xe4 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
__asan_store8_noabort(ffff800001d3c350) at __asan_store8_noabort+0xe4 sys/kern/subr_kasan.c:1099
shm_delete_mapping(ffff800001c8d020,ffff800001cbf008) at shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183
syscall(ffff80003bb88180) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb88180) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfdc0788ba60, 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
__mp_lock(ffffffff85435340) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff85435340) at __mp_lock+0x272 sys/kern/kern_lock.c:173
syscall(ffff80003b71c880) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80003b71c880) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x70b571cfb5a0, count: 9
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
__mp_lock(ffffffff85435340) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff85435340) at __mp_lock+0x272 sys/kern/kern_lock.c:173
syscall(ffff80003b71c880) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80003b71c880) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x70b571cfb5a0, count: -6
---
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syzbot found the following issue on:
HEAD commit: 7c61c2d2eaf2 Fix checkalias contract to register the vnode..
git tree: https://github.com/blackgnezdo/openbsd-src.git syzbot-kasan
console output: https://syzkaller.appspot.com/x/log.txt?x=126d0dd0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=85e25e37d09e1b88
dashboard link: https://syzkaller.appspot.com/bug?extid=f2c08abe216302bc63d6
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0f6409b719e5/disk-7c61c2d2.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/645cca046c7d/bsd-7c61c2d2.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/daa40b48d8c6/kernel-7c61c2d2.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f2c08a...@syzkaller.appspotmail.com
panic: Caught invalid memory access at ffff800001d3c350 size 8 op 1
Stopped at db_enter+0x17: popq %rbp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
180923 91010 0 0 0 1 syz-executor
*182023 91010 0 0 0x4000000 0K syz-executor
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84636510) at panic+0x270 sys/kern/subr_prf.c:198
__asan_store8_noabort(ffff800001d3c350) at __asan_store8_noabort+0xe4 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
__asan_store8_noabort(ffff800001d3c350) at __asan_store8_noabort+0xe4 sys/kern/subr_kasan.c:1099
shm_delete_mapping(ffff800001c8d020,ffff800001cbf008) at shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183
syscall(ffff80003bb88180) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb88180) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfdc0788ba60, 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: Caught invalid memory access at ffff800001d3c350 size 8 op 1
ddb{0}> show kasan
KASAN: invalid write of 8 bytes at 0xffff800001d3c350 from pc 0xffffffff81dc0ec9
KASAN: first bad byte at 0xffff800001d3c350 (+0); shadow 0xfd: pool use-after-free (or unallocated item)
KASAN: 0xffff800001d3c350 is 64 bytes inside the 112-byte item [0xffff800001d3c310..0xffff800001d3c380) in pool 'shmpl'
KASAN: allocated at:
#0 pool_get+0x770 sys/kern/subr_pool.c:733
#1 shmget_allocate_segment+0x23b sys/kern/sysv_shm.c:-1
#2 sys_shmget+0x260 sys/kern/sysv_shm.c:503
#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
KASAN: freed at:
#0 pool_put+0x79 sys/kern/subr_pool.c:918
#1 shm_deallocate_segment+0x85 sys/kern/sysv_shm.c:159
#2 sys_shmctl+0x51e sys/kern/sysv_shm.c:366
#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
KASAN: pc: shm_delete_mapping+0x1f9
KASAN: call trace:
#0 __asan_store8_noabort+0xc0 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
#0 __asan_store8_noabort+0xc0 sys/kern/subr_kasan.c:1099
#1 shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183
#2 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#2 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#3 Xsyscall+0x128
KASAN: shadow of 0xffff800001d3c200..0xffff800001d3c480 (1 cell = 8 bytes):
0xffff800001d3c200: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
0xffff800001d3c280: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
>0xffff800001d3c300: 08 08 08 08 fd fd fd fd fd fd[fd]fd fd fd fd fd
0xffff800001d3c380: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
0xffff800001d3c400: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
KASAN: legend: 00 valid; 01..07 partial; fb malloc redzone; fc malloc freed; fd pool freed; fe kmem; fa global; f1..f4/f8 stack/scope
ddb{0}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84636510) at panic+0x270 sys/kern/subr_prf.c:198
__asan_store8_noabort(ffff800001d3c350) at __asan_store8_noabort+0xe4 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
__asan_store8_noabort(ffff800001d3c350) at __asan_store8_noabort+0xe4 sys/kern/subr_kasan.c:1099
shm_delete_mapping(ffff800001c8d020,ffff800001cbf008) at shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183
syscall(ffff80003bb88180) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb88180) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfdc0788ba60, count: -6
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff80003bb87e30
rbx 0xffff80003bb87ea0
rdx 0
rcx 0xffffffff851c3ff0 cpu_info_full_primary+0x1ff0
rax 0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xffff80003bb87c18
r11 0xffffffff831c6730 x86_bus_space_io_read_1
r12 0xffffffff84636510 __rodata_start+0x9e510
r13 0xffffffff851c4c08 cpu_info_full_primary+0x2c08
r14 0xffffffff851c4e07 cpu_info_full_primary+0x2e07
r15 0x1
rip 0xffffffff82e89947 db_enter+0x17
cs 0x8
rflags 0x246
rsp 0xffff80003bb87e30
ss 0x10
db_enter+0x17: popq %rbp
ddb{0}> show proc
PROC (syz-executor) tid=182023 pid=91010 tcnt=3 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045ff5250,0xffffffff854dd080
process=0xffff800045ff39e0 user=0xffff80003bb7d000, vmspace=0xffff800001c8d020
estcpu=36, cpticks=17, pctcpu=0.0, user=0, sys=17, intr=0
ddb{0}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
91010 180923 6552 0 7 0 0 syz-executor
91010 390121 6552 0 2 0 0x4000080 syz-executor
*91010 182023 6552 0 7 0 0x4000000 syz-executor
61276 345869 15617 0 2 0 0xc80 syz-executor
61276 370393 15617 0 3 0 0x4000080 ttyin syz-executor
61276 141593 15617 0 3 0 0x4000080 fsleep syz-executor
32411 20053 98178 0 2 0 0xc80 syz-executor
32411 236544 98178 0 3 0 0x4000080 kqsel syz-executor
32411 363772 98178 0 3 0 0x4000080 fsleep syz-executor
65966 187106 40364 0 2 0 0xc80 syz-executor
65966 521293 40364 0 3 0 0x4000080 netcon syz-executor
65966 117835 40364 0 3 0 0x4000080 fsleep syz-executor
77655 296369 0 0 3 0x14000 0x200 acct acct
6552 296665 52957 0 2 0x2 0xc80 syz-executor
40364 211302 52957 0 2 0x2 0xc80 syz-executor
73598 465837 1 0 3 0x100003 0x80 ttyin getty
16819 7876 90784 0 3 0x100002 0x80 sbwait arp
90784 153772 70318 0 3 0x100002 0x88 sigsusp sh
43493 82923 52957 0 2 0x2 0xc80 syz-executor
15617 411934 52957 0 2 0x2 0xc80 syz-executor
28496 476855 52957 0 3 0x2 0x80 wait syz-executor
98178 405059 52957 0 2 0x2 0xc80 syz-executor
33174 146350 52957 0 3 0x2 0x80 wait syz-executor
70318 161346 52957 0 3 0x2 0x80 wait syz-executor
52957 421625 35039 0 3 0x2 0x80 kqread syz-executor
35039 367919 61396 0 3 0x100002 0x88 sigsusp ksh
61396 445718 74228 0 3 0x10 0x88 kqread sshd-session
74228 297372 84328 0 3 0x12 0x80 kqread sshd-session
84328 38302 1 0 3 0 0x88 kqread sshd
50239 453627 32453 74 3 0x1100012 0x80 bpf pflogd
32453 6857 1 0 3 0 0x80 sbwait pflogd
34705 415223 24261 73 2 0x1100010 0x80 syslogd
24261 271325 1 0 3 0x100002 0x80 sbwait syslogd
55748 488373 1 0 3 0x100000 0x80 kqread resolvd
59810 173023 65141 77 3 0x100012 0x80 kqread dhcpleased
80424 331461 65141 77 3 0x100012 0x80 kqread dhcpleased
65141 188585 1 0 3 0 0x80 kqread dhcpleased
65492 74 0 0 3 0x14000 0x200 bored smr
71637 310210 0 0 3 0x14000 0x200 pgzero zerothread
6487 462881 0 0 3 0x14000 0x200 aiodoned aiodoned
11933 123414 0 0 3 0x14000 0x200 syncer update
3905 235678 0 0 3 0x14000 0x200 cleaner cleaner
26809 454871 0 0 3 0x14000 0x200 reaper reaper
52219 514923 0 0 3 0x14000 0x200 pgdaemon pagedaemon
25717 329400 0 0 3 0x14000 0x200 bored viomb
21267 58730 0 0 3 0x14000 0x40000200 acpi0 acpi0
47113 62043 0 0 3 0x14000 0x40000200 idle1
8697 433034 0 0 3 0x14000 0x200 bored softnet1
58959 272223 0 0 2 0x14000 0x200 softnet0
6495 89787 0 0 3 0x14000 0x200 bored systqmp
42041 18057 0 0 3 0x14000 0x200 bored systq
46131 478194 0 0 3 0x14000 0x200 tmoslp softclockmp
13707 57334 0 0 3 0x14000 0x40000200 tmoslp softclock
21213 433192 0 0 3 0x14000 0x40000200 idle0
1 83705 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{0}> show all locks
Process 91010 (syz-executor) thread 0xffff800045ff5a18 (182023)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff85435b40)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:-1
#2 sleep_finish+0x423 sys/kern/kern_synch.c:369
#3 rw_do_enter_write+0x21f sys/kern/kern_rwlock.c:298
#4 vm_map_lock_ln+0x19f sys/uvm/uvm_map.c:5170
#5 uvm_unmap+0xc9 sys/uvm/uvm_map.c:1798
#6 shm_delete_mapping+0x1bd sys/kern/sysv_shm.c:182
#7 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#7 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#8 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11047 12243K 12411K 166960K 12293 0
pcb 18 26K 27K 166960K 55 0
rtable 135 7K 12K 166960K 393 0
pf 26 20K 36K 166960K 62 0
ifaddr 25 6K 11K 166960K 57 0
ifgroup 39 1K 2K 166960K 73 0
sysctl 3 1K 13K 166960K 11 0
counters 62 40K 42K 166960K 82 0
ioctlops 0 0K 4K 166960K 1668 0
iov 0 0K 16K 166960K 9 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1299 84K 84K 166960K 1530 0
UFS quota 1 36K 36K 166960K 1 0
UFS mount 5 44K 44K 166960K 5 0
shm 4 10K 10K 166960K 14 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 1K 166960K 17 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 292K 166960K 11964 0
file desc 19 69K 97K 166960K 436 0
sigio 0 0K 0K 166960K 5 0
proc 80 145K 193K 166960K 658 0
subproc 72 9K 9K 166960K 90 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 20K 20K 166960K 1 0
ip_moptions 0 0K 0K 166960K 14 0
in_multi 45 3K 6K 166960K 111 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 13 0
ISOFS mount 1 36K 36K 166960K 1 0
MSDOSFS mount 1 20K 20K 166960K 1 0
ttys 73 506K 506K 166960K 73 0
exec 0 0K 2K 166960K 415 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 252 225K 245K 166960K 5807 0
UVM aobj 85 13K 13K 166960K 87 0
pinsyscall 1069 1846K 1846K 166960K 1642 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 2 0
NDP 8 0K 1K 166960K 36 0
temp 39 9167K 9186K 166960K 9824 0
kqueue 15 48K 52K 166960K 72 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 39 0 35 1 0 1 1 0 8 0
rtentry 176 127 0 68 5 0 5 5 0 8 0
unpcb 144 424 0 401 4 0 4 4 0 8 3
syncache 336 4 0 4 1 1 0 1 0 8 0
tcpcb 736 66 0 61 3 0 3 3 0 8 2
arp 136 21 0 12 1 0 1 1 0 8 0
inpcb 328 397 0 388 5 2 3 4 0 8 2
ip6q 72 1 0 0 1 0 1 1 0 8 0
ip6af 40 1 0 0 1 0 1 1 0 8 0
nd6 152 29 0 19 1 0 1 1 0 8 0
kcovpl 48 10 0 2 1 0 1 1 0 8 0
ppxss 1192 3 0 3 1 0 1 1 0 8 1
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 19 0 3 1 0 1 1 0 8 0
pfstkey 128 19 0 3 1 0 1 1 0 8 0
pfstate 448 19 0 3 3 0 3 3 0 8 0
pfrule 1360 23 0 18 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 506 0 266 26 2 24 26 0 8 4
art_table 40 507 0 266 5 0 5 5 0 8 1
art_node 32 127 0 73 1 0 1 1 0 8 0
sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0
semapl 72 14 0 4 1 0 1 1 0 8 0
shmpl 112 84 0 2 3 0 3 3 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 2050 0 577 93 0 93 93 0 8 0
ffsino 296 2050 0 577 114 0 114 114 0 8 0
nchpl 144 2663 0 951 64 0 64 64 0 8 0
vnodes 216 2228 0 0 124 0 124 124 0 8 0
namei 1024 8824 0 8824 1 0 1 1 0 8 1
percpumem 16 57 0 10 1 0 1 1 0 8 0
kstatmem 264 39 0 20 2 0 2 2 0 8 0
scxspl 216 9539 0 9539 10 7 3 8 1 8 3
plimitpl 152 46 0 28 1 0 1 1 0 8 0
sigapl 424 752 0 702 7 0 7 7 0 8 0
knotepl 120 111 0 0 4 0 4 4 0 8 0
kqueuepl 224 139 0 127 3 2 1 3 0 8 0
pipepl 344 188 0 161 3 0 3 3 0 8 0
fdescpl 528 735 0 702 3 0 3 3 0 8 0
filepl 160 3799 0 3569 15 2 13 13 0 8 3
lockfpl 104 146 0 144 1 0 1 1 0 8 0
lockfspl 48 58 0 56 1 0 1 1 0 8 0
sessionpl 144 38 0 29 1 0 1 1 0 8 0
pgrppl 48 49 0 32 1 0 1 1 0 8 0
ucredpl 104 340 0 325 1 0 1 1 0 8 0
zombiepl 144 705 0 702 1 0 1 1 0 8 0
processpl 1232 752 0 702 5 0 5 5 0 8 0
procpl 664 1231 0 1173 6 0 6 6 0 8 0
sosppl 176 4 0 4 1 0 1 1 0 8 1
sockpl 752 865 0 829 13 2 11 11 0 8 7
mcl64k 65536 9 0 0 2 0 2 2 0 8 0
mcl16k 16384 2 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k128 9344 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 124 0 0 16 0 16 16 0 8 0
mcl2k 2048 26 0 0 4 0 4 4 0 8 0
mextrefs 64 31 0 0 1 0 1 1 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 251 0 0 16 0 16 16 0 8 0
bufpl 272 2996 0 107 193 0 193 193 0 8 0
anonpl 32 7506 0 0 61 0 61 61 0 222 0
amapchunkpl 152 16928 0 16407 23 1 22 22 0 158 1
amappl16 200 2255 0 2228 16 6 10 14 0 8 6
amappl15 192 8 0 8 2 2 0 1 0 8 0
amappl14 184 450 0 448 1 0 1 1 0 8 0
amappl13 176 136 0 123 1 0 1 1 0 8 0
amappl12 168 991 0 959 2 0 2 2 0 8 0
amappl11 160 8 0 7 1 0 1 1 0 8 0
amappl10 152 67 0 52 1 0 1 1 0 8 0
amappl9 144 273 0 272 1 0 1 1 0 8 0
amappl8 136 111 0 108 1 0 1 1 0 8 0
amappl7 128 154 0 140 1 0 1 1 0 8 0
amappl6 120 174 0 171 1 0 1 1 0 8 0
amappl5 112 106 0 96 1 0 1 1 0 8 0
amappl4 104 311 0 291 1 0 1 1 0 8 0
amappl3 96 3383 0 3258 4 0 4 4 0 8 0
amappl2 88 579 0 512 2 0 2 2 0 8 0
amappl1 80 11735 0 11101 16 1 15 16 0 8 0
amappl 88 5007 0 4831 5 0 5 5 0 92 0
uvmvnodes 80 113 0 0 3 0 3 3 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 86 0 2 2 0 2 2 0 8 0
uaddrrnd 24 735 0 702 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 735 0 702 1 0 1 1 0 8 0
vmmpekpl 168 8057 0 8024 3 0 3 3 0 8 0
vmmpepl 168 55135 0 53118 97 2 95 97 0 357 6
vmsppl 488 734 0 702 5 0 5 5 0 8 0
rwobjpl 80 18205 0 17016 28 2 26 27 0 8 0
pdppl 4096 1479 0 1404 105 28 77 89 0 8 2
pvpl 32 14421 0 0 117 0 117 117 0 265 0
pmappl 256 734 0 702 3 0 3 3 0 8 0
extentpl 40 47 0 29 1 0 1 1 0 8 0
phpool 120 477 0 34 14 0 14 14 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84636510) at panic+0x270 sys/kern/subr_prf.c:198
__asan_store8_noabort(ffff800001d3c350) at __asan_store8_noabort+0xe4 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
__asan_store8_noabort(ffff800001d3c350) at __asan_store8_noabort+0xe4 sys/kern/subr_kasan.c:1099
shm_delete_mapping(ffff800001c8d020,ffff800001cbf008) at shm_delete_mapping+0x1f9 sys/kern/sysv_shm.c:183
syscall(ffff80003bb88180) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bb88180) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfdc0788ba60, 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
__mp_lock(ffffffff85435340) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff85435340) at __mp_lock+0x272 sys/kern/kern_lock.c:173
syscall(ffff80003b71c880) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80003b71c880) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x70b571cfb5a0, count: 9
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
__mp_lock(ffffffff85435340) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff85435340) at __mp_lock+0x272 sys/kern/kern_lock.c:173
syscall(ffff80003b71c880) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80003b71c880) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x70b571cfb5a0, count: -6
---
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