uvm_fault(0xfffffd806d2c9780, 0x8, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at fifo_write+0x4e: movq 0x8(%rax),%r12
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*290330 93464 0 0 0 0 syz-executor411574844
fifo_write(ffff800021787760) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:271
VOP_WRITE(fffffd806c625458,ffff8000217877f8,8,fffffd807f7d78f0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
vn_rdwr(1,fffffd806c625458,ffff8000216f7800,101,0,1,d9047f15e8059303,ffff800021787920,fffffd806c625458,78) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:324
ufs_symlink(ffff800021787920) at ufs_symlink+0x136 sys/ufs/ufs/ufs_vnops.c:1386
VOP_SYMLINK(fffffd806c625b18,ffff800021787aa0,ffff800021787ad0,ffff8000217879d0,ffff8000216f7800) at VOP_SYMLINK+0xd0 sys/kern/vfs_vops.c:426
dosymlinkat(ffff8000216f5260,200004c0,3,20000600) at dosymlinkat+0x154 sys/kern/vfs_syscalls.c:1802
syscall(ffff800021787c50) at syscall+0x446 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffbf7d0, count: 7
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>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xfffffd806d2c9780, 0x8, 0, 1) -> e
ddb> trace
fifo_write(ffff800021787760) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:271
VOP_WRITE(fffffd806c625458,ffff8000217877f8,8,fffffd807f7d78f0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
vn_rdwr(1,fffffd806c625458,ffff8000216f7800,101,0,1,d9047f15e8059303,ffff800021787920,fffffd806c625458,78) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:324
ufs_symlink(ffff800021787920) at ufs_symlink+0x136 sys/ufs/ufs/ufs_vnops.c:1386
VOP_SYMLINK(fffffd806c625b18,ffff800021787aa0,ffff800021787ad0,ffff8000217879d0,ffff8000216f7800) at VOP_SYMLINK+0xd0 sys/kern/vfs_vops.c:426
dosymlinkat(ffff8000216f5260,200004c0,3,20000600) at dosymlinkat+0x154 sys/kern/vfs_syscalls.c:1802
syscall(ffff800021787c50) at syscall+0x446 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffbf7d0, count: -8
ddb> show registers
rdi 0x1
rsi 0x1
rbp 0xffff800021787750
rbx 0x8
rdx 0x8
rcx 0x1
rax 0
r8 0
r9 0x1
r10 0x1ea23b1352a20a71
r11 0x5402baa6f999f2ba
r12 0x1
r13 0xffff8000217877f8
r14 0xffff800021787760
r15 0xfffffd806c625458
rip 0xffffffff8181b5de fifo_write+0x4e
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff800021787710
ss 0x10
fifo_write+0x4e: movq 0x8(%rax),%r12
ddb> show proc
PROC (syz-executor411574844) pid=290330 stat=onproc
flags process=0 proc=0
pri=17, usrpri=50, nice=20
forw=0xffffffffffffffff, list=0xffff8000216f5ce0,0xffff8000216f57b0
process=0xffff800021709b88 user=0xffff800021782000, vmspace=0xfffffd806d2c9780
estcpu=0, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
75131 480427 99531 0 2 0 syz-executor411574844
*93464 290330 83965 0 7 0 syz-executor411574844
3912 397535 17876 0 2 0x480 syz-executor411574844
25570 207260 17876 0 2 0 syz-executor411574844
93440 146802 17876 0 2 0x480 syz-executor411574844
16684 307516 17876 0 2 0x480 syz-executor411574844
81116 244606 17876 0 2 0 syz-executor411574844
15061 487562 17876 0 2 0x480 syz-executor411574844
83965 203628 17876 0 2 0x480 syz-executor411574844
99531 107306 17876 0 3 0x80 nanoslp syz-executor411574844
17876 202424 82288 0 3 0x82 nanoslp syz-executor411574844
82288 78760 24164 0 3 0x10008a sigsusp ksh
24164 494983 95751 0 3 0x9a kqread sshd
36604 199438 1 0 3 0x100083 ttyin getty
95751 226392 1 0 3 0x88 kqread sshd
61368 1296 72457 73 3 0x1100090 kqread syslogd
72457 524190 1 0 3 0x100082 netio syslogd
14673 425342 1 0 3 0x100080 kqread resolvd
27345 521161 62177 77 3 0x100092 kqread dhcpleased
54957 237614 62177 77 3 0x100092 kqread dhcpleased
62177 236417 1 0 3 0x80 kqread dhcpleased
538 386781 0 0 3 0x14200 bored smr
66073 14339 0 0 3 0x14200 pgzero zerothread
2824 444891 0 0 3 0x14200 aiodoned aiodoned
96393 513352 0 0 3 0x14200 syncer update
16609 118863 0 0 3 0x14200 cleaner cleaner
98038 502216 0 0 3 0x14200 reaper reaper
53554 25442 0 0 3 0x14200 pgdaemon pagedaemon
61911 312263 0 0 3 0x14200 bored viomb
77174 247244 0 0 3 0x40014200 acpi0 acpi0
25702 314771 0 0 3 0x14200 bored softnet
26139 2599 0 0 3 0x14200 bored softnet
25428 67858 0 0 3 0x14200 bored softnet
49598 269596 0 0 3 0x14200 bored softnet
18489 368007 0 0 3 0x14200 bored systqmp
85444 356694 0 0 3 0x14200 bored systq
9559 460256 0 0 3 0x40014200 bored softclock
82362 78584 0 0 3 0x40014200 idle0
1 316289 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10149 6383K 6414K 78643K 11239 0
pcb 13 8K 8K 78643K 13 0
rtable 58 1K 2K 78643K 111 0
ifaddr 25 7K 7K 78643K 25 0
counters 19 16K 16K 78643K 19 0
ioctlops 0 0K 2K 78643K 25 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1166 73K 73K 78643K 1179 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 0K 0K 78643K 2 0
sem 2 0K 0K 78643K 2 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 1 0K 0K 78643K 1 0
proc 55 58K 59K 78643K 239 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 11 0K 0K 78643K 11 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 25 122K 122K 78643K 25 0
exec 0 0K 1K 78643K 244 0
tdb 3 0K 0K 78643K 3 0
pagedep 1 8K 8K 78643K 1 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 8 62K 64K 78643K 10 0
UVM amap 73 4K 4K 78643K 1238 0
UVM aobj 3 2K 2K 78643K 3 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 3 0K 0K 78643K 3 0
temp 18 4713K 4777K 78643K 2873 0
kqueue 11 16K 18K 78643K 24 0
SYN cache 2 16K 16K 78643K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 21 0 18 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 144 33 0 20 1 0 1 1 0 8 0
syncache 296 5 0 5 2 1 1 1 0 8 1
tcpcb 768 8 0 5 1 0 1 1 0 8 0
arp 88 2 0 0 1 0 1 1 0 8 0
inpcb 336 25 0 19 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 96 0 0 6 0 6 6 0 8 0
art_table 32 97 0 0 1 0 1 1 0 8 0
art_node 16 22 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1477 0 76 88 0 88 88 0 8 0
ffsino 240 1477 0 76 83 0 83 83 0 8 0
nchpl 144 1660 0 88 59 0 59 59 0 8 0
uvmvnodes 80 1486 0 0 31 0 31 31 0 8 0
vnodes 216 1486 0 0 83 0 83 83 0 8 0
namei 1024 4409 0 4406 3 1 2 2 0 8 1
kstatmem 264 6 0 0 1 0 1 1 0 8 0
scxspl 216 4579 0 4579 10 9 1 8 0 8 1
plimitpl 152 16 0 10 1 0 1 1 0 8 0
sigapl 424 331 0 288 6 0 6 6 0 8 0
knotepl 120 10513 0 10484 3 1 2 2 0 8 1
kqueuepl 184 20 0 13 1 0 1 1 0 8 0
pipepl 288 99 0 96 2 1 1 1 0 8 0
fdescpl 432 315 0 292 4 0 4 4 0 8 1
filepl 120 1173 0 1117 2 0 2 2 0 8 0
lockfpl 104 6 0 4 1 0 1 1 0 8 0
lockfspl 48 4 0 2 1 0 1 1 0 8 0
sessionpl 144 17 0 9 1 0 1 1 0 8 0
pgrppl 48 17 0 9 1 0 1 1 0 8 0
ucredpl 104 66 0 56 1 0 1 1 0 8 0
zombiepl 144 292 0 288 2 1 1 1 0 8 0
processpl 1000 331 0 288 7 1 6 6 0 8 0
procpl 672 331 0 288 4 0 4 4 0 8 0
sockpl 456 79 0 57 3 0 3 3 0 8 0
mcl8k 8192 9 0 9 2 1 1 1 0 8 1
mcl4k 4096 5 0 5 2 1 1 1 0 8 1
mcl2k 2048 10746 0 10708 8 1 7 7 0 8 0
mtagpl 96 4 0 4 1 1 0 1 0 8 0
mbufpl 256 19247 0 19165 7 0 7 7 0 8 1
bufpl 288 2388 0 72 166 0 166 166 0 8 0
anonpl 24 41867 0 39309 19 3 16 16 0 188 0
amapchunkpl 152 2727 0 2599 6 1 5 5 0 158 0
amappl16 200 49 0 39 2 1 1 1 0 8 0
amappl14 184 87 0 78 1 0 1 1 0 8 0
amappl12 168 298 0 297 2 1 1 1 0 8 0
amappl11 160 40 0 30 1 0 1 1 0 8 0
amappl10 152 1 0 1 1 1 0 1 0 8 0
amappl9 144 943 0 942 1 0 1 1 0 8 0
amappl8 136 20 0 17 1 0 1 1 0 8 0
amappl7 128 18 0 14 1 0 1 1 0 8 0
amappl6 120 117 0 108 1 0 1 1 0 8 0
amappl5 112 78 0 70 1 0 1 1 0 8 0
amappl4 104 367 0 338 1 0 1 1 0 8 0
amappl3 96 439 0 407 1 0 1 1 0 8 0
amappl2 88 508 0 460 3 1 2 2 0 8 0
amappl1 80 9193 0 8682 14 3 11 11 0 8 0
amappl 88 1085 0 1032 2 0 2 2 0 92 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 253 0 253 1 1 0 1 0 8 0
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 315 0 292 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 315 0 292 1 0 1 1 0 8 0
vmmpekpl 168 6873 0 6859 1 0 1 1 0 8 0
vmmpepl 168 27521 0 26326 60 5 55 55 0 357 1
vmsppl 272 314 0 292 3 1 2 2 0 8 0
rwobjpl 24 10466 0 8296 14 0 14 14 0 8 0
pdppl 4096 636 0 584 86 22 64 64 0 8 12
pvpl 32 131045 0 125899 50 8 42 42 0 265 0
pmappl 216 314 0 292 2 0 2 2 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 464 0 30 13 0 13 13 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
fifo_write(ffff800021787760) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:271
VOP_WRITE(fffffd806c625458,ffff8000217877f8,8,fffffd807f7d78f0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
vn_rdwr(1,fffffd806c625458,ffff8000216f7800,101,0,1,d9047f15e8059303,ffff800021787920,fffffd806c625458,78) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:324
ufs_symlink(ffff800021787920) at ufs_symlink+0x136 sys/ufs/ufs/ufs_vnops.c:1386
VOP_SYMLINK(fffffd806c625b18,ffff800021787aa0,ffff800021787ad0,ffff8000217879d0,ffff8000216f7800) at VOP_SYMLINK+0xd0 sys/kern/vfs_vops.c:426
dosymlinkat(ffff8000216f5260,200004c0,3,20000600) at dosymlinkat+0x154 sys/kern/vfs_syscalls.c:1802
syscall(ffff800021787c50) at syscall+0x446 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffbf7d0, count: -8
ddb> machine ddbcpu 1
No such command
ddb> trace
fifo_write(ffff800021787760) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:271
VOP_WRITE(fffffd806c625458,ffff8000217877f8,8,fffffd807f7d78f0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
vn_rdwr(1,fffffd806c625458,ffff8000216f7800,101,0,1,d9047f15e8059303,ffff800021787920,fffffd806c625458,78) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:324
ufs_symlink(ffff800021787920) at ufs_symlink+0x136 sys/ufs/ufs/ufs_vnops.c:1386
VOP_SYMLINK(fffffd806c625b18,ffff800021787aa0,ffff800021787ad0,ffff8000217879d0,ffff8000216f7800) at VOP_SYMLINK+0xd0 sys/kern/vfs_vops.c:426
dosymlinkat(ffff8000216f5260,200004c0,3,20000600) at dosymlinkat+0x154 sys/kern/vfs_syscalls.c:1802
syscall(ffff800021787c50) at syscall+0x446 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffbf7d0, count: -8
ddb>