panic: vop_generic_badop

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syzbot

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Oct 3, 2021, 6:47:19 PMOct 3
to syzkaller-o...@googlegroups.com
Hello,

syzbot found the following issue on:

HEAD commit: 6dc210665fea Apparently some athn(4) variants are buggy an..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1679bbb0b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=581015ed50e033ec41ba

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+581015...@syzkaller.appspotmail.com

panic: vop_generic_badop
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*353502 75729 32767 0x10 0 1K syz-executor.1
335514 93130 0 0x2 0x4000000 0 syz-fuzzer
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824560e5) at panic+0x177 sys/kern/subr_prf.c:202
vop_generic_badop(ffff80002569ab98) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133
VOP_STRATEGY(fffffd80672909e0) at VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:723
bwrite(fffffd80672909e0) at bwrite+0x1eb sys/kern/vfs_bio.c:763
VOP_BWRITE(fffffd80672909e0) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:735
ufs_mkdir(ffff80002569ae20) at ufs_mkdir+0x6b0 sys/ufs/ufs/ufs_vnops.c:1248
VOP_MKDIR(fffffd80692c3240,ffff80002569af80,ffff80002569afb0,ffff80002569aeb0) at VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:457
domkdirat(ffff8000212102a0,ffffff9c,7f7ffffe8ee0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3065
syscall(ffff80002569b130) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002569b130) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe8f50, count: 4
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: vop_generic_badop
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824560e5) at panic+0x177 sys/kern/subr_prf.c:202
vop_generic_badop(ffff80002569ab98) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133
VOP_STRATEGY(fffffd80672909e0) at VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:723
bwrite(fffffd80672909e0) at bwrite+0x1eb sys/kern/vfs_bio.c:763
VOP_BWRITE(fffffd80672909e0) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:735
ufs_mkdir(ffff80002569ae20) at ufs_mkdir+0x6b0 sys/ufs/ufs/ufs_vnops.c:1248
VOP_MKDIR(fffffd80692c3240,ffff80002569af80,ffff80002569afb0,ffff80002569aeb0) at VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:457
domkdirat(ffff8000212102a0,ffffff9c,7f7ffffe8ee0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3065
syscall(ffff80002569b130) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002569b130) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe8f50, count: -11
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff80002569aac0
rbx 0xffff800020d39bff
rdx 0x8b
rcx 0x2
rax 0x19
r8 0xffffffff8136c5a4 kprintf+0x144
r9 0x1
r10 0x356acf2e5b91398c
r11 0xa465b237c5c34e9b
r12 0xffff800020d39a00
r13 0
r14 0
r15 0x1
rip 0xffffffff817e8be8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff80002569aab0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=353502 stat=onproc
flags process=10<SUGID> proc=0
pri=17, usrpri=63, nice=20
forw=0xffffffffffffffff, list=0xffff800021210540,0xffff800021210010
process=0xffff80002120a190 user=0xffff800025696000, vmspace=0xfffffd807effa450
estcpu=36, cpticks=0, pctcpu=0.5
user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
73571 473142 0 0 3 0x14200 bored sosplice
*75729 353502 53631 32767 7 0x10 syz-executor.1
64589 68166 66358 32767 2 0x10 syz-executor.0
53631 281078 93130 0 3 0x82 wait syz-executor.1
66358 40038 93130 0 3 0x82 wait syz-executor.0
93130 436439 58462 0 3 0x82 thrsleep syz-fuzzer
93130 313416 58462 0 3 0x4000082 nanoslp syz-fuzzer
93130 100305 58462 0 3 0x4000082 thrsleep syz-fuzzer
93130 335514 58462 0 7 0x4000002 syz-fuzzer
93130 225387 58462 0 3 0x4000082 thrsleep syz-fuzzer
93130 503457 58462 0 3 0x4000082 thrsleep syz-fuzzer
93130 20759 58462 0 3 0x4000082 thrsleep syz-fuzzer
93130 507224 58462 0 3 0x4000082 kqread syz-fuzzer
58462 345713 55861 0 3 0x10008a sigsusp ksh
55861 353536 13484 0 2 0x12 sshd
11774 270652 1 0 3 0x100083 ttyin getty
13484 27915 1 0 3 0x88 select sshd
95382 403222 15495 73 3 0x100090 kqread syslogd
15495 524135 1 0 3 0x100082 netio syslogd
91586 185039 1 0 3 0x100080 kqread resolvd
31953 92698 38315 77 3 0x100092 kqread dhcpleased
33545 192017 38315 77 3 0x100092 kqread dhcpleased
38315 399632 1 0 3 0x80 kqread dhcpleased
49829 342341 0 0 3 0x14200 bored smr
45829 309512 0 0 3 0x14200 pgzero zerothread
44988 203132 0 0 3 0x14200 aiodoned aiodoned
88333 360521 0 0 3 0x14200 syncer update
81612 97530 0 0 3 0x14200 cleaner cleaner
18291 40511 0 0 3 0x14200 reaper reaper
30022 344314 0 0 3 0x14200 pgdaemon pagedaemon
30960 445227 0 0 3 0x14200 bored crynlk
89738 73573 0 0 3 0x14200 bored crypto
60033 3397 0 0 3 0x14200 bored viomb
16516 175813 0 0 3 0x40014200 acpi0 acpi0
53628 108873 0 0 3 0x40014200 idle1
3091 490548 0 0 3 0x14200 bored softnet
49782 385749 0 0 3 0x14200 bored systqmp
37466 90300 0 0 3 0x14200 bored systq
23169 163564 0 0 3 0x40014200 bored softclock
69810 404820 0 0 3 0x40014200 idle0
1 487945 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 75729 (syz-executor.1) thread 0xffff8000212102a0 (353502)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828e2720)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 __mp_acquire_count+0x4c sys/kern/kern_lock.c:227
#2 mi_switch+0x3d3 sys/kern/sched_bsd.c:433
#3 sleep_finish+0x1b2 sys/kern/kern_synch.c:433
#4 tsleep+0x125 sys/kern/kern_synch.c:158
#5 biowait+0x91 sys/kern/vfs_bio.c:1271
#6 bwrite+0x216 sys/kern/vfs_bio.c:772
#7 ffs_update+0x2b5 sys/ufs/ffs/ffs_inode.c:113
#8 ufs_mkdir+0x65e sys/ufs/ufs/ufs_vnops.c:1232
#9 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:457
#10 domkdirat+0x121 sys/kern/vfs_syscalls.c:3065
#11 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#11 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#12 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806a7c15e8)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 rw_enter+0x3e2 sys/kern/kern_rwlock.c:310
#2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 vget+0x1eb sys/kern/vfs_subr.c:676
#6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
#7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1321
#8 ffs_inode_alloc+0x1c3 sys/ufs/ffs/ffs_alloc.c:394
#9 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162
#10 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:457
#11 domkdirat+0x121 sys/kern/vfs_syscalls.c:3065
#12 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#12 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#13 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806a7c1a28)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 rw_enter+0x3e2 sys/kern/kern_rwlock.c:310
#2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 vfs_lookup+0xdd sys/kern/vfs_lookup.c:413
#6 namei+0x55a sys/kern/vfs_lookup.c:245
#7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3050
#8 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#9 Xsyscall+0x128
Process 64589 (syz-executor.0) thread 0xffff800021210540 (68166)
exclusive rrwlock inode r = 0 (0xfffffd806a7c14d8)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 rw_enter+0x3e2 sys/kern/kern_rwlock.c:310
#2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 vget+0x1eb sys/kern/vfs_subr.c:676
#6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
#7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1321
#8 ufs_lookup+0x145f sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:88
#10 vfs_lookup+0x737 sys/kern/vfs_lookup.c:561
#11 namei+0x55a sys/kern/vfs_lookup.c:245
#12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849
#13 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#13 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806a7c1b38)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 rw_enter+0x3e2 sys/kern/kern_rwlock.c:310
#2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 vfs_lookup+0xdd sys/kern/vfs_lookup.c:413
#6 namei+0x55a sys/kern/vfs_lookup.c:245
#7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849
#8 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#9 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10115 6407K 6433K 78643K 11205 0
pcb 13 8K 8K 78643K 13 0
rtable 108 3K 3K 78643K 175 0
ifaddr 39 10K 10K 78643K 39 0
counters 44 34K 34K 78643K 44 0
ioctlops 0 0K 2K 78643K 27 0
iov 0 0K 8K 78643K 36 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1216 76K 76K 78643K 1233 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
VM map 2 1K 1K 78643K 2 0
sem 12 1K 1K 78643K 87 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 6 17K 33K 78643K 286 0
proc 56 74K 99K 78643K 279 0
subproc 34 2K 2K 78643K 34 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 33 2K 2K 78643K 33 0
ether_multi 1 0K 0K 78643K 1 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 37 175K 175K 78643K 37 0
exec 0 0K 2K 78643K 383 0
pagedep 1 8K 8K 78643K 1 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 7 26K 26K 78643K 7 0
UVM amap 187 29K 37K 78643K 4957 0
UVM aobj 8 2K 2K 78643K 8 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 5 0K 0K 78643K 9 0
temp 102 4213K 4277K 78643K 2695 0
kqueue 10 14K 16K 78643K 16 0
SYN cache 2 16K 16K 78643K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 22 0 0 1 0 1 1 0 8 0
rtpcb 120 26 0 23 1 0 1 1 0 8 0
rtentry 112 46 0 1 2 0 2 2 0 8 0
unpcb 120 106 0 93 1 0 1 1 0 8 0
syncache 296 4 0 4 1 1 0 1 0 8 0
tcpqe 32 446 0 446 1 1 0 1 0 8 0
tcpcb 736 28 0 24 1 0 1 1 0 8 0
arp 120 6 0 0 1 0 1 1 0 8 0
inpcb 304 95 0 88 2 0 2 2 0 8 1
nd6 48 7 0 0 1 0 1 1 0 8 0
kcovpl 48 2 0 0 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 190 0 0 12 0 12 12 0 8 0
art_table 32 191 0 0 2 0 2 2 0 8 0
art_node 16 45 0 4 1 0 1 1 0 8 0
sysvmsgpl 40 31 0 21 1 0 1 1 0 8 0
semupl 112 15 0 15 1 0 1 1 0 8 1
semapl 112 71 0 61 1 0 1 1 0 8 0
shmpl 112 5 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1707 0 304 88 0 88 88 0 8 0
ffsino 272 1707 0 304 94 0 94 94 0 8 0
nchpl 144 2244 0 632 60 0 60 60 0 8 0
uvmvnodes 72 1750 0 0 32 0 32 32 0 8 0
vnodes 224 1750 0 0 103 0 103 103 0 8 0
namei 1024 5764 0 5763 1 0 1 1 0 8 0
percpumem 16 34 0 0 1 0 1 1 0 8 0
scxspl 216 6678 0 6678 9 1 8 8 0 8 8
plimitpl 152 26 0 16 1 0 1 1 0 8 0
sigapl 424 510 0 476 5 0 5 5 0 8 1
futexpl 56 2784 0 2784 1 0 1 1 0 8 1
knotepl 112 50 0 0 2 0 2 2 0 8 0
kqueuepl 216 285 0 279 2 0 2 2 0 8 1
pipepl 336 97 0 87 2 0 2 2 0 8 1
fdescpl 496 493 0 476 3 0 3 3 0 8 0
filepl 152 2040 0 1931 5 0 5 5 0 8 0
lockfpl 104 56 0 54 1 0 1 1 0 8 0
lockfspl 48 19 0 17 1 0 1 1 0 8 0
sessionpl 144 17 0 7 1 0 1 1 0 8 0
pgrppl 48 17 0 7 1 0 1 1 0 8 0
ucredpl 96 241 0 229 1 0 1 1 0 8 0
zombiepl 144 476 0 476 1 0 1 1 0 8 1
processpl 1072 510 0 476 3 0 3 3 0 8 0
procpl 672 840 0 799 5 0 5 5 0 8 1
sosppl 168 10 0 10 1 0 1 1 0 8 1
sockpl 480 232 0 209 4 0 4 4 0 8 1
mcl64k 65536 5 0 0 1 0 1 1 0 8 0
mcl16k 16384 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 7 0 0 1 0 1 1 0 8 0
mcl2k 2048 242 0 0 30 0 30 30 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 481 0 0 30 0 30 30 0 8 0
bufpl 280 3836 0 157 263 0 263 263 0 8 0
anonpl 24 108147 0 97263 71 1 70 70 0 186 3
amapchunkpl 152 11207 0 10677 26 1 25 25 0 158 1
amappl16 200 777 0 508 16 1 15 15 0 8 0
amappl15 192 204 0 197 1 0 1 1 0 8 0
amappl14 184 4 0 3 1 0 1 1 0 8 0
amappl13 176 27 0 26 1 0 1 1 0 8 0
amappl12 168 3 0 1 1 0 1 1 0 8 0
amappl11 160 68 0 52 1 0 1 1 0 8 0
amappl10 152 11 0 7 1 0 1 1 0 8 0
amappl9 144 185 0 181 1 0 1 1 0 8 0
amappl8 136 333 0 297 2 0 2 2 0 8 0
amappl7 128 59 0 50 1 0 1 1 0 8 0
amappl6 120 176 0 166 1 0 1 1 0 8 0
amappl5 112 1033 0 1014 1 0 1 1 0 8 0
amappl4 104 516 0 493 1 0 1 1 0 8 0
amappl3 96 157 0 142 1 0 1 1 0 8 0
amappl2 88 329 0 293 2 1 1 2 0 8 0
amappl1 80 11522 0 11105 12 2 10 12 0 8 0
amappl 88 4605 0 4473 4 0 4 4 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 64 7 0 0 1 0 1 1 0 8 0
uaddrrnd 24 493 0 476 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 493 0 476 1 0 1 1 0 8 0
vmmpekpl 168 7441 0 7419 2 0 2 2 0 8 0
vmmpepl 168 54181 0 52648 77 0 77 77 0 357 4
vmsppl 368 492 0 476 2 0 2 2 0 8 0
rwobjpl 56 12527 0 11577 18 3 15 15 0 8 1
pdppl 4096 994 0 952 64 14 50 50 0 8 8
pvpl 32 299794 0 285491 132 7 125 132 0 265 6
pmappl 224 492 0 476 2 0 2 2 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 335 0 16 10 0 10 10 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffffffff8278dff0) at x86_ipi_db+0x1a 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+0x23
__mp_lock(ffffffff828e2518) at __mp_lock+0x12e __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828e2518) at __mp_lock+0x12e sys/kern/kern_lock.c:147
pipeselwakeup(fffffd806fa91870) at pipeselwakeup+0x4e sys/kern/sys_pipe.c:366
pipe_write(fffffd806e5d9bf0,ffff80002122fc98,0) at pipe_write+0x771
dofilewritev(ffff8000ffff7a50,14,ffff80002122fc98,0,ffff80002122fd80) at dofilewritev+0x1a3 sys/kern/sys_generic.c:365
sys_write(ffff8000ffff7a50,ffff80002122fd30,ffff80002122fd80) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff80002122fe00) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002122fe00) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2c71715e0, count: 5
ddb{0}> trace
x86_ipi_db(ffffffff8278dff0) at x86_ipi_db+0x1a 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+0x23
__mp_lock(ffffffff828e2518) at __mp_lock+0x12e __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828e2518) at __mp_lock+0x12e sys/kern/kern_lock.c:147
pipeselwakeup(fffffd806fa91870) at pipeselwakeup+0x4e sys/kern/sys_pipe.c:366
pipe_write(fffffd806e5d9bf0,ffff80002122fc98,0) at pipe_write+0x771
dofilewritev(ffff8000ffff7a50,14,ffff80002122fc98,0,ffff80002122fd80) at dofilewritev+0x1a3 sys/kern/sys_generic.c:365
sys_write(ffff8000ffff7a50,ffff80002122fd30,ffff80002122fd80) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff80002122fe00) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002122fe00) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2c71715e0, count: -10
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x18: addq $0x8,%rsp
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824560e5) at panic+0x177 sys/kern/subr_prf.c:202
vop_generic_badop(ffff80002569ab98) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133
VOP_STRATEGY(fffffd80672909e0) at VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:723
bwrite(fffffd80672909e0) at bwrite+0x1eb sys/kern/vfs_bio.c:763
VOP_BWRITE(fffffd80672909e0) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:735
ufs_mkdir(ffff80002569ae20) at ufs_mkdir+0x6b0 sys/ufs/ufs/ufs_vnops.c:1248
VOP_MKDIR(fffffd80692c3240,ffff80002569af80,ffff80002569afb0,ffff80002569aeb0) at VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:457
domkdirat(ffff8000212102a0,ffffff9c,7f7ffffe8ee0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3065
syscall(ffff80002569b130) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002569b130) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe8f50, count: 4
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824560e5) at panic+0x177 sys/kern/subr_prf.c:202
vop_generic_badop(ffff80002569ab98) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133
VOP_STRATEGY(fffffd80672909e0) at VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:723
bwrite(fffffd80672909e0) at bwrite+0x1eb sys/kern/vfs_bio.c:763
VOP_BWRITE(fffffd80672909e0) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:735
ufs_mkdir(ffff80002569ae20) at ufs_mkdir+0x6b0 sys/ufs/ufs/ufs_vnops.c:1248
VOP_MKDIR(fffffd80692c3240,ffff80002569af80,ffff80002569afb0,ffff80002569aeb0) at VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:457
domkdirat(ffff8000212102a0,ffffff9c,7f7ffffe8ee0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3065
syscall(ffff80002569b130) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002569b130) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe8f50, count: -11


---
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