uvm_fault: ffs_nodealloccg (4)

0 views

Skip to first unread message

syzbot

unread,

Mar 28, 2026, 8:14:26 PM (8 days ago) Mar 28

to syzkaller-o...@googlegroups.com

Hello,

syzbot found the following issue on:

HEAD commit: b39c1312a589 Include crypto_assembly.h instead of manually..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=16f3e1d6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=18c0da8db2b18571ff77

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/95bc2385cf2e/disk-b39c1312.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/1799b70ef2c1/bsd-b39c1312.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6cbd81e9171b/kernel-b39c1312.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+18c0da...@syzkaller.appspotmail.com

G��I��""� �<� /�!��j�� uvm_fault(0xffffffff83a7fa78, 0xffff8000137d2004, 0, 1) -> d
kernel: page fault trap, code=0
Stopped at ffs_nodealloccg+0x13c: movl 0x4(%rbx),%r15d
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*499415 35393 60929 0x10 0x4000000 0K syz-executor
ffs_nodealloccg(fffffd806f08cc10,1,6540,4000) at ffs_nodealloccg+0x13c ffs_cgread sys/ufs/ffs/ffs_alloc.c:856 [inline]
ffs_nodealloccg(fffffd806f08cc10,1,6540,4000) at ffs_nodealloccg+0x13c sys/ufs/ffs/ffs_alloc.c:1106
ffs_inode_alloc(fffffd806f08cc10,4000,fffffd80097fd5b0,ffff80003c3fd928) at ffs_inode_alloc+0x20a ffs_hashalloc sys/ufs/ffs/ffs_alloc.c:814 [inline]
ffs_inode_alloc(fffffd806f08cc10,4000,fffffd80097fd5b0,ffff80003c3fd928) at ffs_inode_alloc+0x20a sys/ufs/ffs/ffs_alloc.c:390
ufs_mkdir(ffff80003c3fd990) at ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
VOP_MKDIR(fffffd805de3b980,ffff80003c3fdaf0,ffff80003c3fdb20,ffff80003c3fda20) at VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
domkdirat(ffff80003b7d8020,ffffff9c,200000000100,0) at domkdirat+0x179 sys/kern/vfs_syscalls.c:3143
syscall(ffff80003c3fdca0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3fdca0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe505e0e5bd0, count: 8
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(0xffffffff83a7fa78, 0xffff8000137d2004, 0, 1) -> d
ddb{0}> trace
ffs_nodealloccg(fffffd806f08cc10,1,6540,4000) at ffs_nodealloccg+0x13c ffs_cgread sys/ufs/ffs/ffs_alloc.c:856 [inline]
ffs_nodealloccg(fffffd806f08cc10,1,6540,4000) at ffs_nodealloccg+0x13c sys/ufs/ffs/ffs_alloc.c:1106
ffs_inode_alloc(fffffd806f08cc10,4000,fffffd80097fd5b0,ffff80003c3fd928) at ffs_inode_alloc+0x20a ffs_hashalloc sys/ufs/ffs/ffs_alloc.c:814 [inline]
ffs_inode_alloc(fffffd806f08cc10,4000,fffffd80097fd5b0,ffff80003c3fd928) at ffs_inode_alloc+0x20a sys/ufs/ffs/ffs_alloc.c:390
ufs_mkdir(ffff80003c3fd990) at ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
VOP_MKDIR(fffffd805de3b980,ffff80003c3fdaf0,ffff80003c3fdb20,ffff80003c3fda20) at VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
domkdirat(ffff80003b7d8020,ffffff9c,200000000100,0) at domkdirat+0x179 sys/kern/vfs_syscalls.c:3143
syscall(ffff80003c3fdca0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3fdca0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe505e0e5bd0, count: -7
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80003c3fd740
rbx 0xffff8000137d2000
rdx 0
rcx 0xffff80003b7d8020
rax 0xffffffff83879ff0 cpu_info_full_primary+0x1ff0
r8 0xffffffffffffffff
r9 0xfffffd80097fd5b0
r10 0x95caa7f84274988
r11 0x5836a10d72746d09
r12 0xffff800000c31800
r13 0xfffffd806f5085a8
r14 0x1
r15 0
rip 0xffffffff823c319c ffs_nodealloccg+0x13c
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80003c3fd690
ss 0x10
ffs_nodealloccg+0x13c: movl 0x4(%rbx),%r15d
ddb{0}> show proc
PROC (syz-executor) tid=499415 pid=35393 tcnt=4 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
runpri=50, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80003b7d9a10,0xffffffff839f0738
process=0xffff80003c48a6a8 user=0xffff80003c3f8000, vmspace=0xfffffd806b5d27c0
estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
35393 465060 56914 60929 2 0x90 syz-executor
35393 338889 56914 60929 3 0x4000090 fsleep syz-executor
35393 177168 56914 60929 3 0x4000090 fsleep syz-executor
*35393 499415 56914 60929 7 0x4000010 syz-executor
4583 373720 40554 -1 3 0x90 fsleep syz-executor
4583 422584 40554 -1 3 0x4000090 msgwait syz-executor
70651 209029 55682 0 3 0x80 fsleep syz-executor
70651 339709 55682 0 3 0x4000080 ttyout syz-executor
4318 153135 56073 0 3 0x80 fsleep syz-executor
4318 354317 56073 0 3 0x4000080 sbwait syz-executor
34219 121826 2738 0 2 0xc82 syz-executor
40554 149081 2738 0 2 0xc82 syz-executor
87301 130629 1 0 3 0x100083 ttyopn getty
56914 494422 2738 0 2 0xc82 syz-executor
55682 78886 2738 0 3 0x82 nanoslp syz-executor
96217 516555 2738 0 2 0xc82 syz-executor
56073 134032 2738 0 2 0xc82 syz-executor
2738 199200 29706 0 3 0x82 wait syz-executor
29706 317014 34571 0 3 0x10008a sigsusp ksh
34571 68123 97647 0 3 0x98 kqread sshd-session
97647 116283 80846 0 3 0x92 kqread sshd-session
80846 192167 1 0 3 0x88 kqread sshd
25268 138196 89937 74 3 0x1100092 bpf pflogd
89937 436761 1 0 3 0x80 sbwait pflogd
20314 497926 53485 73 3 0x1100090 kqread syslogd
53485 517206 1 0 3 0x100082 sbwait syslogd
92148 332048 1 0 3 0x100080 kqread resolvd
16281 201685 88375 77 3 0x100092 kqread dhcpleased
61903 118420 88375 77 3 0x100092 kqread dhcpleased
88375 32832 1 0 3 0x80 kqread dhcpleased
23366 470392 0 0 3 0x14200 bored smr
81270 93065 0 0 2 0x14200 zerothread
76973 482851 0 0 3 0x14200 aiodoned aiodoned
46077 271811 0 0 3 0x14200 syncer update
83899 494779 0 0 3 0x14200 cleaner cleaner
51455 342635 0 0 3 0x14200 reaper reaper
57651 412297 0 0 3 0x14200 pgdaemon pagedaemon
290 31871 0 0 3 0x14200 bored viomb
71667 364230 0 0 3 0x40014200 acpi0 acpi0
18133 32255 0 0 3 0x40014200 idle1
25104 381237 0 0 3 0x14200 bored softnet1
75818 92245 0 0 3 0x14200 bored softnet0
91704 441439 0 0 3 0x14200 smrbar systqmp
32879 73272 0 0 3 0x14200 bored systq
45876 333972 0 0 3 0x14200 tmoslp softclockmp
99195 206419 0 0 3 0x40014200 tmoslp softclock
89916 349349 0 0 3 0x40014200 idle0
1 449235 0 0 3 0x82 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb{0}> show all locks
CPU 1:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806b5d1410)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487
#2 pmap_do_remove+0xa9 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_do_remove+0xa9 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline]
#2 pmap_do_remove+0xa9 sys/arch/amd64/amd64/pmap.c:1824
#3 uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1869
#4 uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline]
#4 uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497
#5 exit1+0x6fc sys/kern/kern_exit.c:260
#6 sys_exit+0x1a sys/kern/kern_exit.c:-1
#7 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#7 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#8 Xsyscall+0x128
Process 35393 (syz-executor) thread 0xffff80003b7d8020 (499415)
exclusive rrwlock inode r = 0 (0xfffffd806f08ccb0)
#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:570
#5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1
#6 namei+0x7ca sys/kern/vfs_lookup.c:250
#7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3128
#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
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a18d80)
#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 pool_get+0x27e sys/kern/subr_pool.c:595
#3 namei+0xdf sys/kern/vfs_lookup.c:145
#4 domkdirat+0x8b sys/kern/vfs_syscalls.c:3128
#5 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#6 Xsyscall+0x128
Process 91704 (systqmp) thread 0xffff8000ffffe000 (441439)
shared rwlock systqmp r = 0 (0xffffffff8395b5a8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11085 12170K 12487K 166960K 13574 0
pcb 18 14K 16K 166960K 247 0
rtable 186 17K 18K 166960K 593 0
pf 42 19K 23K 166960K 183 0
ifaddr 35 5K 8K 166960K 102 0
ifgroup 55 2K 2K 166960K 159 0
sysctl 4 1K 9K 166960K 10 0
counters 70 37K 38K 166960K 158 0
ioctlops 0 0K 8K 166960K 1855 0
iov 0 0K 16K 166960K 80 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1419 89K 90K 166960K 2655 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 16 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 69 0
dirhash 12 2K 2K 166960K 24 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 15 53K 89K 166960K 1192 0
sigio 0 0K 0K 166960K 7 0
proc 72 115K 164K 166960K 686 0
subproc 72 4K 4K 166960K 92 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 114 0
in_multi 58 4K 7K 166960K 168 0
ether_multi 1 0K 0K 166960K 11 0
mrt 1 0K 0K 166960K 26 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 85 387K 387K 166960K 85 0
exec 0 0K 1K 166960K 491 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 240 163K 179K 166960K 12415 0
UVM aobj 51 4K 4K 166960K 53 0
pinsyscall 40 80K 102K 166960K 2425 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 75 0
NDP 12 0K 2K 166960K 66 0
temp 64 9081K 9152K 166960K 70677 0
kqueue 13 20K 30K 166960K 227 0
SYN cache 2 8K 16K 166960K 3 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 120 101 0 98 1 0 1 1 0 8 0
rtentry 176 176 0 115 6 1 5 6 0 8 0
unpcb 144 576 0 557 5 4 1 4 0 8 0
syncache 336 7 0 7 1 1 0 1 0 8 0
tcpqe 32 1 0 1 1 1 0 1 0 8 0
tcpcb 736 368 0 360 10 8 2 7 0 8 1
arp 136 30 0 17 1 0 1 1 0 8 0
inpcb 328 1177 0 1164 11 9 2 7 0 8 0
nd6 152 38 0 26 2 0 2 2 0 8 1
pkpcb 40 10 0 10 3 3 0 1 0 8 0
kcovpl 48 10 0 2 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 1 0 1 0 8 0
ppxss 1192 30 0 30 3 2 1 1 0 8 1
pppxif 1576 4 0 4 2 1 1 1 0 8 1
pfstscr 40 53 0 51 1 0 1 1 0 8 0
pffrag 232 9 0 1 1 0 1 1 0 482 0
pffrnode 88 8 0 0 1 0 1 1 0 8 0
pffrent 40 18 0 8 1 0 1 1 0 8 0
pfosfp 40 1428 0 1428 5 5 0 5 0 8 0
pfosfpen 112 1428 0 1428 21 7 14 21 0 8 14
pfrktable 1344 5 0 3 3 2 1 1 0 8 0
pfanchor 1288 7 0 1 1 0 1 1 0 8 0
pftag 88 3 0 2 1 0 1 1 0 8 0
pfstitem 24 124 0 45 1 0 1 1 0 8 0
pfstkey 128 212 0 119 3 0 3 3 0 8 0
pfstate 448 157 0 82 9 0 9 9 0 8 0
pfrule 1360 37 0 28 2 1 1 2 0 8 0
rttmr 136 1 0 1 1 1 0 1 0 8 0
art_heap8 4096 5 0 0 5 0 5 5 0 8 0
art_heap4 256 743 0 511 38 8 30 31 0 8 7
art_table 40 748 0 511 6 0 6 6 0 8 0
art_node 32 175 0 114 1 0 1 1 0 8 0
sysvmsgpl 40 9 0 7 1 0 1 1 0 8 0
semapl 112 66 0 56 1 0 1 1 0 8 0
shmpl 112 50 0 2 2 0 2 2 0 8 0
dirhash 1024 25 0 8 3 0 3 3 0 8 0
dino2pl 256 3696 0 2230 93 0 93 93 0 8 0
ffsino 296 3696 0 2230 114 0 114 114 0 8 0
nchpl 144 5383 0 3674 64 0 64 64 0 8 0
rtmask 32 3 0 3 1 1 0 1 0 8 0
vnodes 216 4588 0 0 255 0 255 255 0 8 0
namei 1024 17547 0 17546 4 3 1 2 0 8 0
percpumem 16 94 0 44 1 0 1 1 0 8 0
pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0
kstatmem 264 98 0 68 4 1 3 3 0 8 0
acpiwqpl 32 2 0 2 1 0 1 1 1 8 1
scsiplug 72 3 0 3 3 2 1 1 0 8 1
scxspl 216 54207 0 54207 12 11 1 8 1 8 1
plimitpl 152 217 0 197 1 0 1 1 0 8 0
sigapl 424 1530 0 1484 9 3 6 8 0 8 0
knotepl 120 561 0 0 17 0 17 17 0 8 0
kqueuepl 224 533 0 523 9 4 5 5 0 8 4
pipepl 344 359 0 332 15 10 5 9 0 8 2
fdescpl 528 1493 0 1464 3 0 3 3 0 8 0
filepl 160 9402 0 9181 23 11 12 19 0 8 1
lockfpl 104 526 0 524 1 0 1 1 0 8 0
lockfspl 48 247 0 245 1 0 1 1 0 8 0
sessionpl 144 72 0 63 1 0 1 1 0 8 0
pgrppl 48 88 0 71 1 0 1 1 0 8 0
ucredpl 104 1399 0 1383 1 0 1 1 0 8 0
zombiepl 144 1683 0 1679 1 0 1 1 0 8 0
processpl 1232 1530 0 1484 6 0 6 6 0 8 0
procpl 664 3174 0 3122 7 1 6 7 0 8 0
sosppl 176 4 0 4 3 2 1 1 0 8 1
sockpl 752 1895 0 1860 17 12 5 11 0 8 0
mcl64k 65536 6 0 0 1 0 1 1 0 8 0
mcl16k 16384 6 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 5 0 0 1 0 1 1 0 8 0
mcl4k 4096 121 0 0 16 1 15 16 0 8 0
mcl2k 2048 46 0 0 5 0 5 5 0 8 0
mtagpl 96 33 0 0 1 0 1 1 0 8 0
mbufpl 256 284 0 0 18 0 18 18 0 8 0
bufpl 280 23885 0 17370 466 0 466 466 0 8 0
anonpl 32 23938 0 0 193 0 193 193 0 246 0
amapchunkpl 152 43090 0 42313 48 16 32 35 0 158 0
amappl16 200 9709 0 9223 116 60 56 62 0 8 8
amappl15 192 11 0 10 2 1 1 1 0 8 0
amappl14 184 455 0 452 1 0 1 1 0 8 0
amappl13 176 164 0 152 1 0 1 1 0 8 0
amappl12 168 1757 0 1729 2 0 2 2 0 8 0
amappl11 160 12 0 12 1 1 0 1 0 8 0
amappl10 152 158 0 144 1 0 1 1 0 8 0
amappl9 144 269 0 267 1 0 1 1 0 8 0
amappl8 136 113 0 110 1 0 1 1 0 8 0
amappl7 128 163 0 150 1 0 1 1 0 8 0
amappl6 120 183 0 181 1 0 1 1 0 8 0
amappl5 112 105 0 93 1 0 1 1 0 8 0
amappl4 104 328 0 306 1 0 1 1 0 8 0
amappl3 96 8489 0 8382 4 0 4 4 0 8 0
amappl2 88 611 0 549 2 0 2 2 0 8 0
amappl1 80 15979 0 15380 17 2 15 17 0 8 0
amappl 88 11452 0 11286 5 0 5 5 0 92 0
uvmvnodes 80 135 0 0 3 0 3 3 0 8 0
dma8192 8192 1 0 1 1 1 0 1 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma2048 2048 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 128 255 0 255 3 2 1 1 0 8 1
dma64 64 8 0 8 2 2 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 19 0 18 1 0 1 1 0 8 0
aobjpl 72 52 0 2 1 0 1 1 0 8 0
uaddrrnd 24 1493 0 1464 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1493 0 1464 1 0 1 1 0 8 0
vmmpekpl 168 14054 0 14010 3 0 3 3 0 8 0
vmmpepl 168 108564 0 106260 162 26 136 136 0 357 9
vmsppl 488 1492 0 1463 5 0 5 5 0 8 0
rwobjpl 80 34370 0 32779 57 10 47 47 0 8 3
pdppl 4096 2993 0 2926 109 38 71 83 0 8 4
pvpl 32 31121 0 0 252 1 251 251 0 265 0
pmappl 256 1492 0 1463 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 325 0 65 8 0 8 8 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
ffs_nodealloccg(fffffd806f08cc10,1,6540,4000) at ffs_nodealloccg+0x13c ffs_cgread sys/ufs/ffs/ffs_alloc.c:856 [inline]
ffs_nodealloccg(fffffd806f08cc10,1,6540,4000) at ffs_nodealloccg+0x13c sys/ufs/ffs/ffs_alloc.c:1106
ffs_inode_alloc(fffffd806f08cc10,4000,fffffd80097fd5b0,ffff80003c3fd928) at ffs_inode_alloc+0x20a ffs_hashalloc sys/ufs/ffs/ffs_alloc.c:814 [inline]
ffs_inode_alloc(fffffd806f08cc10,4000,fffffd80097fd5b0,ffff80003c3fd928) at ffs_inode_alloc+0x20a sys/ufs/ffs/ffs_alloc.c:390
ufs_mkdir(ffff80003c3fd990) at ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
VOP_MKDIR(fffffd805de3b980,ffff80003c3fdaf0,ffff80003c3fdb20,ffff80003c3fda20) at VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
domkdirat(ffff80003b7d8020,ffffff9c,200000000100,0) at domkdirat+0x179 sys/kern/vfs_syscalls.c:3143
syscall(ffff80003c3fdca0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3fdca0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe505e0e5bd0, count: -7
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff8000299bdff0) 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(ffffffff83a18580) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a18580) at __mp_lock+0x192 sys/kern/kern_lock.c:173
exit1(ffff80003b7d94e0,0,0,1) at exit1+0x701 sys/kern/kern_exit.c:260
sys_exit(ffff80003b7d94e0,ffff80002a375380,ffff80002a3752d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a375380) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a375380) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fdd8888d1a0, count: 7
ddb{1}> trace
x86_ipi_db(ffff8000299bdff0) 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(ffffffff83a18580) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a18580) at __mp_lock+0x192 sys/kern/kern_lock.c:173
exit1(ffff80003b7d94e0,0,0,1) at exit1+0x701 sys/kern/kern_exit.c:260
sys_exit(ffff80003b7d94e0,ffff80002a375380,ffff80002a3752d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a375380) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a375380) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fdd8888d1a0, count: -8

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report