panic: vputonfreelist: lock count is not zero (4)
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syzbot
Jun 1, 2026, 2:18:27 PM (3 days ago) Jun 1
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: bddfd4c1ae9e sk-usbhid: skip unsupported key types in read..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=12b0ce73980000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=bb4eed30f1aecf1ac78c
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/540fa8f7270f/disk-bddfd4c1.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/d8720b3636d8/bsd-bddfd4c1.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5cd3cbedd4ef/kernel-bddfd4c1.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bb4eed...@syzkaller.appspotmail.com
panic: vputonfreelist: lock count is not zero
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
265958 75750 32767 0x11 0x4000000 1 syz-executor
*316832 75750 32767 0x11 0x4000000 0K syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83510873) at panic+0x1e5 sys/kern/subr_prf.c:198
vputonfreelist(fffffd800c7301f8) at vputonfreelist+0x221
vput(fffffd800c7301f8) at vput+0x166 sys/kern/vfs_subr.c:791
vn_closefile(fffffd806bee7540,ffff8000fffe87e8) at vn_closefile+0x13f sys/kern/vfs_vnops.c:622
fdrop(fffffd806bee7540,ffff8000fffe87e8) at fdrop+0x121 sys/kern/kern_descrip.c:1281
sys_fsync(ffff8000fffe87e8,ffff80003438a5d0,ffff80003438a520) at sys_fsync+0x1b7 sys/kern/vfs_syscalls.c:-1
syscall(ffff80003438a5d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003438a5d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb9135203fd0, count: 6
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: vputonfreelist: lock count is not zero
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83510873) at panic+0x1e5 sys/kern/subr_prf.c:198
vputonfreelist(fffffd800c7301f8) at vputonfreelist+0x221
vput(fffffd800c7301f8) at vput+0x166 sys/kern/vfs_subr.c:791
vn_closefile(fffffd806bee7540,ffff8000fffe87e8) at vn_closefile+0x13f sys/kern/vfs_vnops.c:622
fdrop(fffffd806bee7540,ffff8000fffe87e8) at fdrop+0x121 sys/kern/kern_descrip.c:1281
sys_fsync(ffff8000fffe87e8,ffff80003438a5d0,ffff80003438a520) at sys_fsync+0x1b7 sys/kern/vfs_syscalls.c:-1
syscall(ffff80003438a5d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003438a5d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb9135203fd0, count: -9
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff80003438a2c0
rbx 0xffffffff83977e07 cpu_info_full_primary+0x2e07
rdx 0
rcx 0xffff8000fffe87e8
rax 0xffffffff83976ff0 cpu_info_full_primary+0x1ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xff6e1077247ecc9
r11 0x505faecf38e0e578
r12 0xffffffff83977c08 cpu_info_full_primary+0x2c08
r13 0
r14 0
r15 0x1
rip 0xffffffff81cd3775 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80003438a2b0
ss 0
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=316832 pid=75750 tcnt=4 stat=onproc
flags process=11<CONTROLT,SUGID> proc=4000000<THREAD>
runpri=17, usrpri=69, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000fffe8d18,0xffff8000fffe94f0
process=0xffff8000fffe5830 user=0xffff800034385000, vmspace=0xfffffd800c48d028
estcpu=19, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
75750 500183 35245 32767 2 0x11 syz-executor
75750 265958 35245 32767 7 0x4000011 syz-executor
*75750 316832 35245 32767 7 0x4000011 syz-executor
75750 470572 35245 32767 3 0x4000091 fsleep syz-executor
43918 49074 79944 32767 3 0x90 nanoslp syz-executor
43918 246296 79944 32767 3 0x4000090 ttyout syz-executor
43918 12455 79944 32767 3 0x4000010 biowait syz-executor
43918 114025 79944 32767 3 0x4000090 fsleep syz-executor
67505 329245 24235 32767 3 0x90 piperd syz-executor
42718 249702 38141 32767 3 0x90 piperd syz-executor
45212 452891 99330 32767 3 0x90 piperd syz-executor
79944 391640 22114 32767 3 0x90 nanoslp syz-executor
51628 173869 80341 32767 3 0x90 piperd syz-executor
35245 139985 93787 32767 3 0x90 nanoslp syz-executor
6098 279786 49490 32767 3 0x90 piperd syz-executor
80341 273576 6373 0 3 0x82 wait syz-executor
38141 349439 6373 0 3 0x82 wait syz-executor
99330 378053 6373 0 3 0x82 wait syz-executor
93787 138879 6373 0 3 0x82 wait syz-executor
22114 393969 6373 0 3 0x82 wait syz-executor
49490 38598 6373 0 3 0x82 wait syz-executor
24235 436268 6373 0 3 0x82 wait syz-executor
6373 364518 17964 0 3 0x82 nanoslp syz-executor
17964 449438 72398 0 3 0x10008a sigsusp ksh
72398 256735 89153 0 3 0x98 kqread sshd-session
89153 174335 18950 0 3 0x92 kqread sshd-session
24230 346872 1 0 3 0x100083 ttyin getty
18950 382597 1 0 3 0x88 kqread sshd
93591 152125 38917 73 3 0x1100090 kqread syslogd
38917 456475 1 0 3 0x100082 sbwait syslogd
2619 417134 1 0 3 0x100080 kqread resolvd
54273 162896 34877 77 3 0x100092 kqread dhcpleased
74285 153757 34877 77 3 0x100092 kqread dhcpleased
34877 489681 1 0 3 0x80 kqread dhcpleased
84251 57945 0 0 3 0x14200 bored smr
60167 180061 0 0 3 0x14200 pgzero zerothread
10616 371663 0 0 3 0x14200 aiodoned aiodoned
6689 350084 0 0 3 0x14200 syncer update
10773 372873 0 0 3 0x14200 cleaner cleaner
34065 261687 0 0 3 0x14200 reaper reaper
95813 492048 0 0 3 0x14200 pgdaemon pagedaemon
66628 133866 0 0 3 0x14200 bored viomb
4990 35493 0 0 3 0x40014200 acpi0 acpi0
45918 387295 0 0 3 0x40014200 idle1
15954 333849 0 0 3 0x14200 bored softnet1
22709 277104 0 0 3 0x14200 bored softnet0
66255 76316 0 0 3 0x14200 bored systqmp
78324 484619 0 0 3 0x14200 bored systq
11318 455223 0 0 3 0x14200 tmoslp softclockmp
46878 321155 0 0 3 0x40014200 tmoslp softclock
477 336024 0 0 3 0x40014200 idle0
1 524281 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 75750 (syz-executor) thread 0xffff8000fffe87e8 (316832)
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff83a619c0)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
#2 sleep_finish+0x2d8 sys/kern/kern_synch.c:369
#3 biowait+0xc6 sys/kern/vfs_bio.c:1242
#4 bwrite+0x2e7 sys/kern/vfs_bio.c:754
#5 ffs_update+0x2fe sys/ufs/ffs/ffs_inode.c:111
#6 VOP_FSYNC+0x107 sys/kern/vfs_vops.c:311
#7 sys_fsync+0x161 sys/kern/vfs_syscalls.c:2976
#8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#9 Xsyscall+0x128
Process 43918 (syz-executor) thread 0xffff8000fffe8d18 (12455)
exclusive rrwlock inode r = 0 (0xfffffd80663e70c8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576
#5 vn_write+0x18f sys/kern/vfs_vnops.c:411
#6 dofilewritev+0x2bd sys/kern/sys_generic.c:384
#7 sys_write+0xa2 sys/kern/sys_generic.c:300
#8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
#9 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11051 12016K 12034K 166960K 12145 0
pcb 17 12K 12K 166960K 17 0
rtable 219 6K 7K 166960K 358 0
pf 29 16K 16K 166960K 31 0
ifaddr 39 7K 7K 166960K 44 0
ifgroup 46 2K 2K 166960K 50 0
sysctl 1 1K 9K 166960K 5 0
counters 68 36K 37K 166960K 70 0
ioctlops 0 0K 2K 166960K 36 0
iov 0 0K 16K 166960K 11 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1287 81K 81K 166960K 1514 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 6 0
VM map 2 1K 1K 166960K 2 0
sem 12 1K 1K 166960K 13 0
dirhash 12 2K 2K 166960K 18 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 18 65K 129K 166960K 412 0
sigio 0 0K 0K 166960K 4 0
proc 58 99K 147K 166960K 534 0
subproc 63 3K 4K 166960K 189 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 42 0
in_multi 88 6K 7K 166960K 107 0
ether_multi 1 0K 0K 166960K 3 0
mrt 0 0K 0K 166960K 15 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 67 307K 307K 166960K 67 0
exec 0 0K 1K 166960K 401 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 202 158K 187K 166960K 5102 0
UVM aobj 75 3K 3K 166960K 77 0
pinsyscall 39 78K 122K 166960K 1532 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 12 0
NDP 10 0K 2K 166960K 27 0
temp 45 9117K 9121K 166960K 4492 0
kqueue 13 20K 27K 166960K 85 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 26 0 0 1 0 1 1 0 8 0
rtpcb 120 113 0 110 3 0 3 3 0 8 2
rtentry 176 112 0 11 6 0 6 6 0 8 0
unpcb 144 275 0 260 5 1 4 5 0 8 3
syncache 336 8 0 8 1 0 1 1 0 8 1
sackhl 24 1 0 1 1 1 0 1 0 8 0
tcpqe 32 2 0 2 1 1 0 1 0 8 0
tcpcb 736 234 0 227 7 1 6 7 0 8 4
arp 136 18 0 2 1 0 1 1 0 8 0
ipq 40 1 0 0 1 0 1 1 0 8 0
ipqe 40 1 0 0 1 0 1 1 0 8 0
inpcb 328 426 0 414 7 1 6 7 0 8 4
ip6q 72 2 0 0 1 0 1 1 0 8 0
ip6af 40 2 0 0 1 0 1 1 0 8 0
nd6 152 25 0 3 1 0 1 1 0 8 0
kcovpl 48 21 0 14 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 454 0 44 29 1 28 29 0 8 1
art_table 40 455 0 44 5 0 5 5 0 8 0
art_node 32 112 0 21 1 0 1 1 0 8 0
sysvmsgpl 40 11 0 6 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 72 11 0 1 1 0 1 1 0 8 0
shmpl 112 74 0 2 3 0 3 3 0 8 0
dirhash 1024 21 0 4 3 0 3 3 0 8 0
dino2pl 256 1931 0 455 93 0 93 93 0 8 0
ffsino 296 1931 0 455 114 0 114 114 0 8 0
nchpl 144 2448 0 748 64 0 64 64 0 8 0
vnodes 216 2129 0 0 119 0 119 119 0 8 0
namei 1024 8131 0 8131 2 1 1 2 0 8 1
percpumem 16 50 0 1 1 0 1 1 0 8 0
kstatmem 264 25 0 2 2 0 2 2 0 8 0
scxspl 216 8058 0 8057 6 5 1 3 1 8 0
plimitpl 152 195 0 173 2 1 1 2 0 8 0
sigapl 424 688 0 642 7 0 7 7 0 8 1
knotepl 120 295 0 0 9 0 9 9 0 8 0
kqueuepl 224 89 0 80 1 0 1 1 0 8 0
pipepl 344 186 0 159 3 0 3 3 0 8 0
fdescpl 528 672 0 642 4 0 4 4 0 8 1
filepl 160 3820 0 3619 22 6 16 22 0 8 7
lockfpl 104 61 0 59 1 0 1 1 0 8 0
lockfspl 48 25 0 23 1 0 1 1 0 8 0
sessionpl 144 54 0 38 1 0 1 1 0 8 0
pgrppl 48 75 0 52 1 0 1 1 0 8 0
ucredpl 104 536 0 518 1 0 1 1 0 8 0
zombiepl 144 642 0 642 1 0 1 1 0 8 1
processpl 1232 688 0 642 5 0 5 5 0 8 0
procpl 664 1079 0 1027 6 0 6 6 0 8 1
sockpl 752 816 0 786 19 7 12 19 0 8 8
mcl64k 65536 3 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 117 0 0 15 0 15 15 0 8 0
mcl2k 2048 21 0 0 3 0 3 3 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 312 0 0 20 0 20 20 0 8 0
bufpl 280 2625 0 102 181 0 181 181 0 8 0
anonpl 32 6869 0 0 56 0 56 56 0 246 0
amapchunkpl 152 15859 0 15457 29 2 27 29 0 158 8
amappl16 200 1787 0 1770 16 6 10 14 0 8 8
amappl15 192 6 0 6 1 1 0 1 0 8 0
amappl14 184 412 0 411 1 0 1 1 0 8 0
amappl13 176 120 0 110 1 0 1 1 0 8 0
amappl12 168 943 0 914 2 0 2 2 0 8 0
amappl11 160 5 0 5 1 1 0 1 0 8 0
amappl10 152 55 0 45 1 0 1 1 0 8 0
amappl9 144 278 0 278 1 1 0 1 0 8 0
amappl8 136 95 0 93 1 0 1 1 0 8 0
amappl7 128 221 0 210 1 0 1 1 0 8 0
amappl6 120 150 0 148 1 0 1 1 0 8 0
amappl5 112 99 0 92 1 0 1 1 0 8 0
amappl4 104 272 0 257 1 0 1 1 0 8 0
amappl3 96 2996 0 2902 5 1 4 4 0 8 0
amappl2 88 562 0 505 2 0 2 2 0 8 0
amappl1 80 12132 0 11590 15 0 15 15 0 8 2
amappl 88 4330 0 4191 5 0 5 5 0 92 0
uvmvnodes 80 116 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 76 0 2 2 0 2 2 0 8 0
uaddrrnd 24 672 0 642 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 672 0 642 1 0 1 1 0 8 0
vmmpekpl 168 7824 0 7789 2 0 2 2 0 8 0
vmmpepl 168 52590 0 50878 95 1 94 94 0 357 9
vmsppl 488 671 0 642 7 1 6 6 0 8 1
rwobjpl 80 17643 0 16674 25 0 25 25 0 8 2
pdppl 4096 1351 0 1284 117 36 81 99 0 8 14
pvpl 32 13602 0 0 110 0 110 110 0 265 0
pmappl 256 671 0 642 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 300 0 42 8 0 8 8 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83510873) at panic+0x1e5 sys/kern/subr_prf.c:198
vputonfreelist(fffffd800c7301f8) at vputonfreelist+0x221
vput(fffffd800c7301f8) at vput+0x166 sys/kern/vfs_subr.c:791
vn_closefile(fffffd806bee7540,ffff8000fffe87e8) at vn_closefile+0x13f sys/kern/vfs_vnops.c:622
fdrop(fffffd806bee7540,ffff8000fffe87e8) at fdrop+0x121 sys/kern/kern_descrip.c:1281
sys_fsync(ffff8000fffe87e8,ffff80003438a5d0,ffff80003438a520) at sys_fsync+0x1b7 sys/kern/vfs_syscalls.c:-1
syscall(ffff80003438a5d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003438a5d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb9135203fd0, count: -9
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff80002999dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff83a611c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a611c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173
__mp_acquire_count(ffffffff83a611c0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369
rw_do_enter_write(fffffd8066407548,1) at rw_do_enter_write+0x1dc sys/kern/kern_rwlock.c:298
rrw_enter(fffffd8066407548,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd800c7301f8,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffffd800c7301f8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576
cttywrite(100,ffff80002a395fb0,1) at cttywrite+0xa2 sys/kern/tty_tty.c:88
spec_write(ffff80002a395d80) at spec_write+0x11f sys/kern/spec_vnops.c:302
VOP_WRITE(fffffd806fc3c298,ffff80002a395fb0,1,fffffd80097fd270) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd806bee75e0,ffff80002a395fb0,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:414
end trace frame: 0xffff80002a395f20, count: 0
ddb{1}> trace
x86_ipi_db(ffff80002999dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff83a611c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a611c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173
__mp_acquire_count(ffffffff83a611c0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369
rw_do_enter_write(fffffd8066407548,1) at rw_do_enter_write+0x1dc sys/kern/kern_rwlock.c:298
rrw_enter(fffffd8066407548,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd800c7301f8,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffffd800c7301f8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576
cttywrite(100,ffff80002a395fb0,1) at cttywrite+0xa2 sys/kern/tty_tty.c:88
spec_write(ffff80002a395d80) at spec_write+0x11f sys/kern/spec_vnops.c:302
VOP_WRITE(fffffd806fc3c298,ffff80002a395fb0,1,fffffd80097fd270) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd806bee75e0,ffff80002a395fb0,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:414
dofilewritev(ffff8000fffe8550,5,ffff80002a395fb0,0,ffff80002a396070) at dofilewritev+0x2bd sys/kern/sys_generic.c:384
sys_writev(ffff8000fffe8550,ffff80002a396120,ffff80002a396070) at sys_writev+0xd8 sys/kern/sys_generic.c:327
syscall(ffff80002a396120) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a396120) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb91ec4ae6c0, count: -18
---
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syzbot found the following issue on:
HEAD commit: bddfd4c1ae9e sk-usbhid: skip unsupported key types in read..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=12b0ce73980000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=bb4eed30f1aecf1ac78c
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/540fa8f7270f/disk-bddfd4c1.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/d8720b3636d8/bsd-bddfd4c1.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5cd3cbedd4ef/kernel-bddfd4c1.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bb4eed...@syzkaller.appspotmail.com
panic: vputonfreelist: lock count is not zero
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
265958 75750 32767 0x11 0x4000000 1 syz-executor
*316832 75750 32767 0x11 0x4000000 0K syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83510873) at panic+0x1e5 sys/kern/subr_prf.c:198
vputonfreelist(fffffd800c7301f8) at vputonfreelist+0x221
vput(fffffd800c7301f8) at vput+0x166 sys/kern/vfs_subr.c:791
vn_closefile(fffffd806bee7540,ffff8000fffe87e8) at vn_closefile+0x13f sys/kern/vfs_vnops.c:622
fdrop(fffffd806bee7540,ffff8000fffe87e8) at fdrop+0x121 sys/kern/kern_descrip.c:1281
sys_fsync(ffff8000fffe87e8,ffff80003438a5d0,ffff80003438a520) at sys_fsync+0x1b7 sys/kern/vfs_syscalls.c:-1
syscall(ffff80003438a5d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003438a5d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb9135203fd0, count: 6
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: vputonfreelist: lock count is not zero
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83510873) at panic+0x1e5 sys/kern/subr_prf.c:198
vputonfreelist(fffffd800c7301f8) at vputonfreelist+0x221
vput(fffffd800c7301f8) at vput+0x166 sys/kern/vfs_subr.c:791
vn_closefile(fffffd806bee7540,ffff8000fffe87e8) at vn_closefile+0x13f sys/kern/vfs_vnops.c:622
fdrop(fffffd806bee7540,ffff8000fffe87e8) at fdrop+0x121 sys/kern/kern_descrip.c:1281
sys_fsync(ffff8000fffe87e8,ffff80003438a5d0,ffff80003438a520) at sys_fsync+0x1b7 sys/kern/vfs_syscalls.c:-1
syscall(ffff80003438a5d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003438a5d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb9135203fd0, count: -9
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff80003438a2c0
rbx 0xffffffff83977e07 cpu_info_full_primary+0x2e07
rdx 0
rcx 0xffff8000fffe87e8
rax 0xffffffff83976ff0 cpu_info_full_primary+0x1ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xff6e1077247ecc9
r11 0x505faecf38e0e578
r12 0xffffffff83977c08 cpu_info_full_primary+0x2c08
r13 0
r14 0
r15 0x1
rip 0xffffffff81cd3775 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80003438a2b0
ss 0
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=316832 pid=75750 tcnt=4 stat=onproc
flags process=11<CONTROLT,SUGID> proc=4000000<THREAD>
runpri=17, usrpri=69, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000fffe8d18,0xffff8000fffe94f0
process=0xffff8000fffe5830 user=0xffff800034385000, vmspace=0xfffffd800c48d028
estcpu=19, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
75750 500183 35245 32767 2 0x11 syz-executor
75750 265958 35245 32767 7 0x4000011 syz-executor
*75750 316832 35245 32767 7 0x4000011 syz-executor
75750 470572 35245 32767 3 0x4000091 fsleep syz-executor
43918 49074 79944 32767 3 0x90 nanoslp syz-executor
43918 246296 79944 32767 3 0x4000090 ttyout syz-executor
43918 12455 79944 32767 3 0x4000010 biowait syz-executor
43918 114025 79944 32767 3 0x4000090 fsleep syz-executor
67505 329245 24235 32767 3 0x90 piperd syz-executor
42718 249702 38141 32767 3 0x90 piperd syz-executor
45212 452891 99330 32767 3 0x90 piperd syz-executor
79944 391640 22114 32767 3 0x90 nanoslp syz-executor
51628 173869 80341 32767 3 0x90 piperd syz-executor
35245 139985 93787 32767 3 0x90 nanoslp syz-executor
6098 279786 49490 32767 3 0x90 piperd syz-executor
80341 273576 6373 0 3 0x82 wait syz-executor
38141 349439 6373 0 3 0x82 wait syz-executor
99330 378053 6373 0 3 0x82 wait syz-executor
93787 138879 6373 0 3 0x82 wait syz-executor
22114 393969 6373 0 3 0x82 wait syz-executor
49490 38598 6373 0 3 0x82 wait syz-executor
24235 436268 6373 0 3 0x82 wait syz-executor
6373 364518 17964 0 3 0x82 nanoslp syz-executor
17964 449438 72398 0 3 0x10008a sigsusp ksh
72398 256735 89153 0 3 0x98 kqread sshd-session
89153 174335 18950 0 3 0x92 kqread sshd-session
24230 346872 1 0 3 0x100083 ttyin getty
18950 382597 1 0 3 0x88 kqread sshd
93591 152125 38917 73 3 0x1100090 kqread syslogd
38917 456475 1 0 3 0x100082 sbwait syslogd
2619 417134 1 0 3 0x100080 kqread resolvd
54273 162896 34877 77 3 0x100092 kqread dhcpleased
74285 153757 34877 77 3 0x100092 kqread dhcpleased
34877 489681 1 0 3 0x80 kqread dhcpleased
84251 57945 0 0 3 0x14200 bored smr
60167 180061 0 0 3 0x14200 pgzero zerothread
10616 371663 0 0 3 0x14200 aiodoned aiodoned
6689 350084 0 0 3 0x14200 syncer update
10773 372873 0 0 3 0x14200 cleaner cleaner
34065 261687 0 0 3 0x14200 reaper reaper
95813 492048 0 0 3 0x14200 pgdaemon pagedaemon
66628 133866 0 0 3 0x14200 bored viomb
4990 35493 0 0 3 0x40014200 acpi0 acpi0
45918 387295 0 0 3 0x40014200 idle1
15954 333849 0 0 3 0x14200 bored softnet1
22709 277104 0 0 3 0x14200 bored softnet0
66255 76316 0 0 3 0x14200 bored systqmp
78324 484619 0 0 3 0x14200 bored systq
11318 455223 0 0 3 0x14200 tmoslp softclockmp
46878 321155 0 0 3 0x40014200 tmoslp softclock
477 336024 0 0 3 0x40014200 idle0
1 524281 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 75750 (syz-executor) thread 0xffff8000fffe87e8 (316832)
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff83a619c0)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
#2 sleep_finish+0x2d8 sys/kern/kern_synch.c:369
#3 biowait+0xc6 sys/kern/vfs_bio.c:1242
#4 bwrite+0x2e7 sys/kern/vfs_bio.c:754
#5 ffs_update+0x2fe sys/ufs/ffs/ffs_inode.c:111
#6 VOP_FSYNC+0x107 sys/kern/vfs_vops.c:311
#7 sys_fsync+0x161 sys/kern/vfs_syscalls.c:2976
#8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#9 Xsyscall+0x128
Process 43918 (syz-executor) thread 0xffff8000fffe8d18 (12455)
exclusive rrwlock inode r = 0 (0xfffffd80663e70c8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576
#5 vn_write+0x18f sys/kern/vfs_vnops.c:411
#6 dofilewritev+0x2bd sys/kern/sys_generic.c:384
#7 sys_write+0xa2 sys/kern/sys_generic.c:300
#8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
#9 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11051 12016K 12034K 166960K 12145 0
pcb 17 12K 12K 166960K 17 0
rtable 219 6K 7K 166960K 358 0
pf 29 16K 16K 166960K 31 0
ifaddr 39 7K 7K 166960K 44 0
ifgroup 46 2K 2K 166960K 50 0
sysctl 1 1K 9K 166960K 5 0
counters 68 36K 37K 166960K 70 0
ioctlops 0 0K 2K 166960K 36 0
iov 0 0K 16K 166960K 11 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1287 81K 81K 166960K 1514 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 6 0
VM map 2 1K 1K 166960K 2 0
sem 12 1K 1K 166960K 13 0
dirhash 12 2K 2K 166960K 18 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 18 65K 129K 166960K 412 0
sigio 0 0K 0K 166960K 4 0
proc 58 99K 147K 166960K 534 0
subproc 63 3K 4K 166960K 189 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 42 0
in_multi 88 6K 7K 166960K 107 0
ether_multi 1 0K 0K 166960K 3 0
mrt 0 0K 0K 166960K 15 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 67 307K 307K 166960K 67 0
exec 0 0K 1K 166960K 401 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 202 158K 187K 166960K 5102 0
UVM aobj 75 3K 3K 166960K 77 0
pinsyscall 39 78K 122K 166960K 1532 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 12 0
NDP 10 0K 2K 166960K 27 0
temp 45 9117K 9121K 166960K 4492 0
kqueue 13 20K 27K 166960K 85 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 26 0 0 1 0 1 1 0 8 0
rtpcb 120 113 0 110 3 0 3 3 0 8 2
rtentry 176 112 0 11 6 0 6 6 0 8 0
unpcb 144 275 0 260 5 1 4 5 0 8 3
syncache 336 8 0 8 1 0 1 1 0 8 1
sackhl 24 1 0 1 1 1 0 1 0 8 0
tcpqe 32 2 0 2 1 1 0 1 0 8 0
tcpcb 736 234 0 227 7 1 6 7 0 8 4
arp 136 18 0 2 1 0 1 1 0 8 0
ipq 40 1 0 0 1 0 1 1 0 8 0
ipqe 40 1 0 0 1 0 1 1 0 8 0
inpcb 328 426 0 414 7 1 6 7 0 8 4
ip6q 72 2 0 0 1 0 1 1 0 8 0
ip6af 40 2 0 0 1 0 1 1 0 8 0
nd6 152 25 0 3 1 0 1 1 0 8 0
kcovpl 48 21 0 14 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 454 0 44 29 1 28 29 0 8 1
art_table 40 455 0 44 5 0 5 5 0 8 0
art_node 32 112 0 21 1 0 1 1 0 8 0
sysvmsgpl 40 11 0 6 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 72 11 0 1 1 0 1 1 0 8 0
shmpl 112 74 0 2 3 0 3 3 0 8 0
dirhash 1024 21 0 4 3 0 3 3 0 8 0
dino2pl 256 1931 0 455 93 0 93 93 0 8 0
ffsino 296 1931 0 455 114 0 114 114 0 8 0
nchpl 144 2448 0 748 64 0 64 64 0 8 0
vnodes 216 2129 0 0 119 0 119 119 0 8 0
namei 1024 8131 0 8131 2 1 1 2 0 8 1
percpumem 16 50 0 1 1 0 1 1 0 8 0
kstatmem 264 25 0 2 2 0 2 2 0 8 0
scxspl 216 8058 0 8057 6 5 1 3 1 8 0
plimitpl 152 195 0 173 2 1 1 2 0 8 0
sigapl 424 688 0 642 7 0 7 7 0 8 1
knotepl 120 295 0 0 9 0 9 9 0 8 0
kqueuepl 224 89 0 80 1 0 1 1 0 8 0
pipepl 344 186 0 159 3 0 3 3 0 8 0
fdescpl 528 672 0 642 4 0 4 4 0 8 1
filepl 160 3820 0 3619 22 6 16 22 0 8 7
lockfpl 104 61 0 59 1 0 1 1 0 8 0
lockfspl 48 25 0 23 1 0 1 1 0 8 0
sessionpl 144 54 0 38 1 0 1 1 0 8 0
pgrppl 48 75 0 52 1 0 1 1 0 8 0
ucredpl 104 536 0 518 1 0 1 1 0 8 0
zombiepl 144 642 0 642 1 0 1 1 0 8 1
processpl 1232 688 0 642 5 0 5 5 0 8 0
procpl 664 1079 0 1027 6 0 6 6 0 8 1
sockpl 752 816 0 786 19 7 12 19 0 8 8
mcl64k 65536 3 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 117 0 0 15 0 15 15 0 8 0
mcl2k 2048 21 0 0 3 0 3 3 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 312 0 0 20 0 20 20 0 8 0
bufpl 280 2625 0 102 181 0 181 181 0 8 0
anonpl 32 6869 0 0 56 0 56 56 0 246 0
amapchunkpl 152 15859 0 15457 29 2 27 29 0 158 8
amappl16 200 1787 0 1770 16 6 10 14 0 8 8
amappl15 192 6 0 6 1 1 0 1 0 8 0
amappl14 184 412 0 411 1 0 1 1 0 8 0
amappl13 176 120 0 110 1 0 1 1 0 8 0
amappl12 168 943 0 914 2 0 2 2 0 8 0
amappl11 160 5 0 5 1 1 0 1 0 8 0
amappl10 152 55 0 45 1 0 1 1 0 8 0
amappl9 144 278 0 278 1 1 0 1 0 8 0
amappl8 136 95 0 93 1 0 1 1 0 8 0
amappl7 128 221 0 210 1 0 1 1 0 8 0
amappl6 120 150 0 148 1 0 1 1 0 8 0
amappl5 112 99 0 92 1 0 1 1 0 8 0
amappl4 104 272 0 257 1 0 1 1 0 8 0
amappl3 96 2996 0 2902 5 1 4 4 0 8 0
amappl2 88 562 0 505 2 0 2 2 0 8 0
amappl1 80 12132 0 11590 15 0 15 15 0 8 2
amappl 88 4330 0 4191 5 0 5 5 0 92 0
uvmvnodes 80 116 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 76 0 2 2 0 2 2 0 8 0
uaddrrnd 24 672 0 642 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 672 0 642 1 0 1 1 0 8 0
vmmpekpl 168 7824 0 7789 2 0 2 2 0 8 0
vmmpepl 168 52590 0 50878 95 1 94 94 0 357 9
vmsppl 488 671 0 642 7 1 6 6 0 8 1
rwobjpl 80 17643 0 16674 25 0 25 25 0 8 2
pdppl 4096 1351 0 1284 117 36 81 99 0 8 14
pvpl 32 13602 0 0 110 0 110 110 0 265 0
pmappl 256 671 0 642 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 300 0 42 8 0 8 8 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83510873) at panic+0x1e5 sys/kern/subr_prf.c:198
vputonfreelist(fffffd800c7301f8) at vputonfreelist+0x221
vput(fffffd800c7301f8) at vput+0x166 sys/kern/vfs_subr.c:791
vn_closefile(fffffd806bee7540,ffff8000fffe87e8) at vn_closefile+0x13f sys/kern/vfs_vnops.c:622
fdrop(fffffd806bee7540,ffff8000fffe87e8) at fdrop+0x121 sys/kern/kern_descrip.c:1281
sys_fsync(ffff8000fffe87e8,ffff80003438a5d0,ffff80003438a520) at sys_fsync+0x1b7 sys/kern/vfs_syscalls.c:-1
syscall(ffff80003438a5d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003438a5d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb9135203fd0, count: -9
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff80002999dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff83a611c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a611c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173
__mp_acquire_count(ffffffff83a611c0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369
rw_do_enter_write(fffffd8066407548,1) at rw_do_enter_write+0x1dc sys/kern/kern_rwlock.c:298
rrw_enter(fffffd8066407548,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd800c7301f8,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffffd800c7301f8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576
cttywrite(100,ffff80002a395fb0,1) at cttywrite+0xa2 sys/kern/tty_tty.c:88
spec_write(ffff80002a395d80) at spec_write+0x11f sys/kern/spec_vnops.c:302
VOP_WRITE(fffffd806fc3c298,ffff80002a395fb0,1,fffffd80097fd270) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd806bee75e0,ffff80002a395fb0,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:414
end trace frame: 0xffff80002a395f20, count: 0
ddb{1}> trace
x86_ipi_db(ffff80002999dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff83a611c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a611c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173
__mp_acquire_count(ffffffff83a611c0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369
rw_do_enter_write(fffffd8066407548,1) at rw_do_enter_write+0x1dc sys/kern/kern_rwlock.c:298
rrw_enter(fffffd8066407548,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd800c7301f8,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffffd800c7301f8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576
cttywrite(100,ffff80002a395fb0,1) at cttywrite+0xa2 sys/kern/tty_tty.c:88
spec_write(ffff80002a395d80) at spec_write+0x11f sys/kern/spec_vnops.c:302
VOP_WRITE(fffffd806fc3c298,ffff80002a395fb0,1,fffffd80097fd270) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd806bee75e0,ffff80002a395fb0,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:414
dofilewritev(ffff8000fffe8550,5,ffff80002a395fb0,0,ffff80002a396070) at dofilewritev+0x2bd sys/kern/sys_generic.c:384
sys_writev(ffff8000fffe8550,ffff80002a396120,ffff80002a396070) at sys_writev+0xd8 sys/kern/sys_generic.c:327
syscall(ffff80002a396120) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a396120) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb91ec4ae6c0, count: -18
---
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