login: panic: kernel diagnostic assertion "timo || _kernel_lock_held()" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_synch.c", line 121
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
388950 39601 0 0 0x4000000 0 syz-executor4793
*445333 85914 0 0 0x4000000 1 syz-executor4793
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
__assert(ffffffff81fb5b5c,ffffffff81fd515d,79,ffffffff81fc5830) at __assert+0x2e sys/kern/subr_prf.c:154
tsleep(fffffd806d2f5b40,8,ffffffff81fb40b2,0) at tsleep+0x3fb sleep_finish_all sys/kern/kern_synch.c:405 [inline]
tsleep(fffffd806d2f5b40,8,ffffffff81fb40b2,0) at tsleep+0x3fb sys/kern/kern_synch.c:152
vn_seek(fffffd807b0024c0,ffff800020bb5808,0,ffff800020aff8b8) at vn_seek+0xa0 vn_lock sys/kern/vfs_vnops.c:556 [inline]
vn_seek(fffffd807b0024c0,ffff800020bb5808,0,ffff800020aff8b8) at vn_seek+0xa0 sys/kern/vfs_vnops.c:611
sys_lseek(ffff800020aff8b8,ffff800020bb5878,ffff800020bb58e0) at sys_lseek+0x6f sys/kern/vfs_syscalls.c:1859
syscall(ffff800020bb5950) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800020bb5950) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555
Xsyscall(6,0,945385670c8,0,945385670a8,945385670a0) at Xsyscall+0x128
end of kernel
end trace frame: 0x9483259cce0, 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{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
kernel diagnostic assertion "timo || _kernel_lock_held()" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_synch.c", line 121
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
__assert(ffffffff81fb5b5c,ffffffff81fd515d,79,ffffffff81fc5830) at __assert+0x2e sys/kern/subr_prf.c:154
tsleep(fffffd806d2f5b40,8,ffffffff81fb40b2,0) at tsleep+0x3fb sleep_finish_all sys/kern/kern_synch.c:405 [inline]
tsleep(fffffd806d2f5b40,8,ffffffff81fb40b2,0) at tsleep+0x3fb sys/kern/kern_synch.c:152
vn_seek(fffffd807b0024c0,ffff800020bb5808,0,ffff800020aff8b8) at vn_seek+0xa0 vn_lock sys/kern/vfs_vnops.c:556 [inline]
vn_seek(fffffd807b0024c0,ffff800020bb5808,0,ffff800020aff8b8) at vn_seek+0xa0 sys/kern/vfs_vnops.c:611
sys_lseek(ffff800020aff8b8,ffff800020bb5878,ffff800020bb58e0) at sys_lseek+0x6f sys/kern/vfs_syscalls.c:1859
syscall(ffff800020bb5950) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800020bb5950) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555
Xsyscall(6,0,945385670c8,0,945385670a8,945385670a0) at Xsyscall+0x128
end of kernel
end trace frame: 0x9483259cce0, count: -8
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800020bb5590
rbx 0xffff800020bb5640
rdx 0x8b
rcx 0x2
rax 0x1
r8 0xffffffff81b1c663 kprintf+0x173
r9 0x1
r10 0x4da86d535fba2a30
r11 0x821ce3a1a12ad9d8
r12 0x3000000008
r13 0xffff800020bb55a0
r14 0x100
r15 0x1
rip 0xffffffff811a7028 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020bb5580
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor4793) pid=445333 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=52, usrpri=52, nice=20
forw=0xffffffffffffffff, list=0xffff800020afe008,0xffff800020afe508
process=0xffff800020b2a710 user=0xffff800020bb0000, vmspace=0xfffffd806e8f1738
estcpu=36, cpticks=2, pctcpu=0.0
user=0, sys=2, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
39601 204572 97462 0 2 0 syz-executor4793
39601 325977 97462 0 3 0x4000080 fsleep syz-executor4793
39601 388950 97462 0 7 0x4000000 syz-executor4793
85914 517016 1651 0 2 0 syz-executor4793
*85914 445333 1651 0 7 0x4000000 syz-executor4793
97462 32853 94562 0 3 0x80 nanosleep syz-executor4793
1651 153458 94562 0 3 0x80 nanosleep syz-executor4793
94562 493971 31450 0 3 0x82 nanosleep syz-executor4793
31450 33961 13540 0 3 0x10008a pause ksh
13540 372110 19139 0 3 0x92 select sshd
58890 442653 1 0 3 0x100083 ttyin getty
19139 226125 1 0 3 0x80 select sshd
85415 172628 15082 73 3 0x100090 kqread syslogd
15082 393815 1 0 3 0x100082 netio syslogd
84541 392921 1 77 3 0x100090 poll dhclient
14733 272732 1 0 3 0x80 poll dhclient
16976 486309 0 0 2 0x14200 zerothread
79982 446158 0 0 3 0x14200 aiodoned aiodoned
4777 348358 0 0 3 0x14200 syncer update
27634 260760 0 0 3 0x14200 cleaner cleaner
46161 60181 0 0 3 0x14200 reaper reaper
10408 215339 0 0 3 0x14200 pgdaemon pagedaemon
65729 320803 0 0 3 0x14200 bored crynlk
26764 505248 0 0 3 0x14200 bored crypto
55960 272271 0 0 3 0x40014200 acpi0 acpi0
4652 25522 0 0 3 0x40014200 idle1
97061 364490 0 0 3 0x14200 bored softnet
61173 183324 0 0 3 0x14200 bored systqmp
7216 452373 0 0 3 0x14200 bored systq
18286 289152 0 0 3 0x40014200 bored softclock
35173 355206 0 0 3 0x40014200 idle0
94142 143501 0 0 3 0x14200 bored smr
1 266328 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 39601 (syz-executor4793) thread 0xffff800020afe280 (388950)
exclusive rwlock fdlock r = 0 (0xfffffd807f7c5058)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 ptmioctl+0xe7 sys/kern/tty_pty.c:1071
#2 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290
#3 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524
#4 sys_ioctl+0x5b8
#5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#5 syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#6 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9448 6316K 6317K 78643K 10535 0 0
pcb 13 8K 8K 78643K 13 0 0
rtable 61 2K 2K 78643K 115 0 0
ifaddr 21 7K 7K 78643K 21 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 2K 78643K 13 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1180 74K 74K 78643K 1618 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 1K 78643K 2 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 2 0K 0K 78643K 2 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12765 0 0
file desc 3 4K 5K 78643K 610 0 0
proc 40 38K 46K 78643K 257 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
in_multi 11 0K 0K 78643K 11 0 0
ether_multi 1 0K 0K 78643K 1 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 42 185K 185K 78643K 42 0 0
exec 0 0K 1K 78643K 152 0 0
pagedep 1 8K 8K 78643K 1 0 0
inodedep 1 32K 32K 78643K 1 0 0
newblk 1 0K 0K 78643K 1 0 0
VM swap 7 26K 26K 78643K 7 0 0
UVM amap 64 3K 3K 78643K 1489 0 0
UVM aobj 2 2K 2K 78643K 2 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
NDP 3 0K 0K 78643K 3 0 0
temp 30 2731K 2795K 78643K 2120 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp 64 2 0 0 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 15 0 13 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 120 27 0 19 1 0 1 1 0 8 0
syncache 264 5 0 5 2 1 1 1 0 8 1
tcpcb 544 8 0 5 1 0 1 1 0 8 0
inpcb 280 22 0 16 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
dino1pl 128 2029 0 650 45 0 45 45 0 8 0
ffsino 272 2029 0 650 92 0 92 92 0 8 0
nchpl 144 2419 0 880 58 0 58 58 0 8 0
uvmvnodes 72 2038 0 0 38 0 38 38 0 8 0
vnodes 200 2038 0 0 108 0 108 108 0 8 0
namei 1024 7508 0 7508 2 1 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
scxspl 192 5107 0 5105 9 8 1 6 0 8 0
plimitpl 152 13 0 8 1 0 1 1 0 8 0
sigapl 432 381 0 367 2 0 2 2 0 8 0
futexpl 56 1501 0 1500 1 0 1 1 0 8 0
knotepl 112 5 0 0 1 0 1 1 0 8 0
kqueuepl 104 1 0 0 1 0 1 1 0 8 0
pipepl 112 118 0 111 3 2 1 1 0 8 0
fdescpl 488 382 0 367 2 0 2 2 0 8 0
filepl 152 3469 0 3417 3 0 3 3 0 8 1
lockfpl 104 6 0 6 1 1 0 1 0 8 0
lockfspl 48 3 0 3 1 1 0 1 0 8 0
sessionpl 112 17 0 9 1 0 1 1 0 8 0
pgrppl 48 17 0 9 1 0 1 1 0 8 0
ucredpl 96 2476 0 2469 1 0 1 1 0 8 0
zombiepl 144 367 0 367 3 2 1 1 0 8 1
processpl 896 397 0 367 4 0 4 4 0 8 0
procpl 632 974 0 941 4 0 4 4 0 8 1
sockpl 384 64 0 48 2 0 2 2 0 8 0
mcl4k 4096 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 64 0 0 8 0 8 8 0 8 0
mtagpl 80 1 0 0 1 0 1 1 0 8 0
mbufpl 256 92 0 0 5 0 5 5 0 8 0
bufpl 256 2288 0 262 127 0 127 127 0 8 0
anonpl 16 30591 0 29323 8 2 6 6 0 125 0
amapchunkpl 152 1835 0 1790 3 0 3 3 0 158 1
amappl16 192 539 0 523 1 0 1 1 0 8 0
amappl14 176 36 0 32 1 0 1 1 0 8 0
amappl12 160 9 0 9 1 1 0 1 0 8 0
amappl11 152 42 0 31 1 0 1 1 0 8 0
amappl10 144 46 0 46 2 1 1 1 0 8 1
amappl9 136 400 0 399 1 0 1 1 0 8 0
amappl8 128 91 0 83 1 0 1 1 0 8 0
amappl7 120 14 0 13 1 0 1 1 0 8 0
amappl6 112 40 0 36 1 0 1 1 0 8 0
amappl5 104 119 0 110 1 0 1 1 0 8 0
amappl4 96 606 0 581 1 0 1 1 0 8 0
amappl3 88 350 0 336 1 0 1 1 0 8 0
amappl2 80 2355 0 2285 4 2 2 2 0 8 0
amappl1 72 18574 0 18147 14 4 10 14 0 8 0
amappl 80 1146 0 1120 1 0 1 1 0 84 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma64 64 259 0 259 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 17 0 17 1 1 0 1 0 8 0
aobjpl 64 1 0 0 1 0 1 1 0 8 0
uaddrrnd 24 382 0 367 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 382 0 367 1 0 1 1 0 8 0
vmmpekpl 168 6873 0 6855 1 0 1 1 0 8 0
vmmpepl 168 42685 0 41742 56 13 43 44 0 357 2
vmsppl 368 381 0 367 2 0 2 2 0 8 0
pdppl 4096 772 0 734 5 0 5 5 0 8 0
pvpl 32 98033 0 95021 34 8 26 26 0 265 1
pmappl 232 381 0 367 1 0 1 1 0 8 0
extentpl 40 41 0 26 1 0 1 1 0 8 0
phpool 112 255 0 3 8 0 8 8 0 8 0