6kernel:I Tp 0g ea faStopped at savectx+0xae: movl $0,%gs:0x688
TID PID UID PRFLAGS PFLAGS CPU COMMAND
278680 84806 0 0x10 0x4000000 1K syz-executor
*321288 92537 0 0 0 0 syz-executor
savectx() at savectx+0xae
end of kernel
end trace frame: 0x7a6ec9bdfe20, count: 14
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
*cpu1: uvm_fault(0xfffff8006c4bc7c0, 0x98, 0, 1) -> e
ddb{0}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x7a6ec9bdfe20, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80002a2298f0
rbx 0
rdx 0
rcx 0xffff80002a223a00
rax 0x3c
r8 0xffff80002a229820
r9 0
r10 0x54448af98b96475d
r11 0x75349fd2a7862f11
r12 0
r13 0
r14 0xffff80002a223a00
r15 0
rip 0xffffffff8306a3ee savectx+0xae
cs 0x8
rflags 0x46
rsp 0xffff80002a229870
ss 0x10
savectx+0xae: movl $0,%gs:0x688
ddb{0}> show proc
PROC (syz-executor) tid=321288 pid=92537 tcnt=4 stat=onproc
flags process=0 proc=0
runpri=86, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80003c3d6558,0xffff80003c3d6d30
process=0xffff8000ffff0e80 user=0xffff80002a224000, vmspace=0xfffff8000b063988
estcpu=36, cpticks=6, pctcpu=0.0, user=3, sys=3, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
43288 186303 6809 0 2 0 syz-executor
43288 228523 6809 0 3 0x4000080 fsleep syz-executor
43288 9107 6809 0 3 0x4000080 fsleep syz-executor
84806 231198 30297 0 2 0x10 syz-executor
84806 278680 30297 0 7 0x4000010 syz-executor
31915 400694 89316 -1 2 0x10 syz-executor
31915 513204 89316 -1 3 0x4000090 fsleep syz-executor
31915 257027 89316 -1 3 0x4000090 fsleep syz-executor
31915 104052 89316 -1 2 0x4000010 syz-executor
60055 36252 10415 0 3 0x80 nanoslp syz-executor
60055 353672 10415 0 3 0x4000080 sbwait syz-executor
60055 395913 10415 0 3 0x4000080 fsleep syz-executor
*92537 321288 80642 0 7 0 syz-executor
92537 386046 80642 0 3 0x4000080 ttyout syz-executor
92537 481802 80642 0 3 0x4000080 fsleep syz-executor
92537 491673 80642 0 3 0x4000080 fsleep syz-executor
97224 103561 1 0 3 0x100083 ttyopn getty
89316 94074 54241 0 3 0x82 nanoslp syz-executor
29388 289552 54241 0 3 0x2 biowait syz-executor
5854 36743 54241 0 3 0x2 biowait syz-executor
30297 31015 54241 0 3 0x82 nanoslp syz-executor
92499 21220 54241 0 3 0x2 biowait syz-executor
80642 515742 54241 0 3 0x82 nanoslp syz-executor
6809 263907 54241 0 3 0x82 nanoslp syz-executor
10415 449739 54241 0 3 0x82 nanoslp syz-executor
54241 463976 1 0 3 0x82 kqread syz-executor
87406 312711 0 0 3 0x14200 bored smr
97580 381603 0 0 2 0x14200 zerothread
49309 149309 0 0 3 0x14200 aiodoned aiodoned
40010 177781 0 0 3 0x14200 syncer update
15158 120981 0 0 3 0x14200 cleaner cleaner
70962 180868 0 0 3 0x14200 reaper reaper
64637 446944 0 0 3 0x14200 pgdaemon pagedaemon
10648 453177 0 0 3 0x14200 bored viomb
62611 348285 0 0 3 0x40014200 acpi0 acpi0
18933 206065 0 0 3 0x40014200 idle1
28571 122770 0 0 3 0x14200 bored softnet1
32302 144830 0 0 3 0x14200 bored softnet0
2083 391825 0 0 3 0x14200 bored systqmp
31974 189400 0 0 3 0x14200 bored systq
5552 272 0 0 3 0x14200 tmoslp softclockmp
46607 285947 0 0 3 0x40014200 tmoslp softclock
94949 508360 0 0 3 0x40014200 idle0
1 311322 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 84806 (syz-executor) thread 0xffff8000fffee548 (278680)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a3c2c0)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
#1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
#2 Xsyscall+0x128
Process 29388 (syz-executor) thread 0xffff8000fffef240 (289552)
exclusive rrwlock inode r = 0 (0xfffff8006c6748e0)
#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 vget+0x2a2 sys/kern/vfs_subr.c:686
#6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98
#7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203
#8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478
#9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
#10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580
#11 namei+0x7c5 sys/kern/vfs_lookup.c:250
#12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806
#13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffff8006ee61368)
#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 vget+0x2a2 sys/kern/vfs_subr.c:686
#6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98
#7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203
#8 ufs_lookup+0x16bd sys/ufs/ufs/ufs_lookup.c:573
#9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
#10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580
#11 namei+0x7c5 sys/kern/vfs_lookup.c:250
#12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806
#13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#14 Xsyscall+0x128
Process 5854 (syz-executor) thread 0xffff8000fffef770 (36743)
exclusive rrwlock inode r = 0 (0xfffff8006c6747b8)
#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 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline]
#4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159
#5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232
#6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393
#7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
#8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
#9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3062
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffff8006cdbd7a8)
#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 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431
#6 namei+0x7c5 sys/kern/vfs_lookup.c:250
#7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3047
#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 92499 (syz-executor) thread 0xffff80002a222010 (21220)
exclusive rrwlock inode r = 0 (0xfffff8006c674d80)
#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 vget+0x2a2 sys/kern/vfs_subr.c:686
#6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98
#7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203
#8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478
#9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
#10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580
#11 namei+0x7c5 sys/kern/vfs_lookup.c:250
#12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806
#13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffff8006cdbd430)
#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 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431
#6 namei+0x7c5 sys/kern/vfs_lookup.c:250
#7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806
#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
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11064 12221K 12352K 166960K 12403 0
pcb 18 12K 12K 166960K 66 0
rtable 242 8K 8K 166960K 374 0
pf 40 19K 22K 166960K 111 0
ifaddr 43 7K 7K 166960K 52 0
ifgroup 55 2K 2K 166960K 70 0
sysctl 4 1K 9K 166960K 11 0
counters 70 37K 37K 166960K 80 0
ioctlops 0 0K 4K 166960K 1520 0
iov 0 0K 16K 166960K 6 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1291 81K 82K 166960K 1637 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 8 0
VM map 2 1K 1K 166960K 2 0
sem 9 0K 0K 166960K 18 0
dirhash 12 2K 2K 166960K 15 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 14 53K 93K 166960K 332 0
sigio 0 0K 0K 166960K 3 0
proc 21 33K 180K 166960K 579 0
subproc 72 4K 4K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 19 0
in_multi 99 7K 7K 166960K 102 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 10 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 73 334K 334K 166960K 73 0
exec 0 0K 1K 166960K 398 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 130 82K 170K 166960K 4832 0
UVM aobj 9 2K 2K 166960K 9 0
pinsyscall 17 34K 104K 166960K 1502 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 5 0
NDP 12 0K 1K 166960K 33 0
temp 41 9115K 9154K 166960K 10982 0
kqueue 1 2K 24K 166960K 51 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 41 0 41 1 0 1 1 0 8 1
rtentry 176 113 0 3 6 0 6 6 0 8 1
unpcb 144 130 0 128 1 0 1 1 0 8 0
syncache 336 5 0 5 1 0 1 1 0 8 1
tcpcb 736 40 0 39 2 0 2 2 0 8 1
arp 136 18 0 0 1 0 1 1 0 8 0
inpcb 328 221 0 219 2 0 2 2 0 8 1
nd6 152 25 0 1 1 0 1 1 0 8 0
pkpcb 40 65 0 65 1 0 1 1 0 8 1
kcovpl 48 8 0 0 1 0 1 1 0 8 0
ppxss 1192 3 0 3 1 0 1 1 0 8 1
pfstscr 40 6 0 2 1 0 1 1 0 8 0
pffrag 232 3 0 0 1 0 1 1 0 482 0
pffrnode 88 3 0 0 1 0 1 1 0 8 0
pffrent 40 8 0 4 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfrktable 1344 7 0 5 1 0 1 1 0 8 0
pfanchor 1288 2 0 0 1 0 1 1 0 8 0
pfstitem 24 36 0 0 1 0 1 1 0 8 0
pfstkey 128 38 0 2 2 0 2 2 0 8 0
pfstate 448 35 0 1 4 0 4 4 0 8 0
pfrule 1360 31 0 18 3 1 2 2 0 8 0
rttmr 136 1 0 1 1 0 1 1 0 8 1
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 496 0 45 31 0 31 31 0 8 2
art_table 40 497 0 45 5 0 5 5 0 8 0
art_node 32 113 0 13 1 0 1 1 0 8 0
sysvmsgpl 40 4 0 1 1 0 1 1 0 8 0
semupl 112 2 0 2 1 0 1 1 0 8 1
semapl 72 14 0 7 1 0 1 1 0 8 0
shmpl 112 6 0 0 1 0 1 1 0 8 0
dirhash 1024 19 0 2 3 0 3 3 0 8 0
dino2pl 256 2026 0 554 93 0 93 93 0 8 0
ffsino 296 2026 0 554 115 0 115 115 0 8 1
nchpl 144 2466 0 757 64 0 64 64 0 8 0
vnodes 216 2215 0 0 124 0 124 124 0 8 0
namei 1024 7958 0 7957 3 0 3 3 0 8 2
percpumem 16 55 0 5 1 0 1 1 0 8 0
pfiaddrpl 120 8 0 0 1 0 1 1 0 8 0
acpiwqpl 32 1 0 1 1 0 1 1 1 8 1
kstatmem 264 37 0 10 3 0 3 3 0 8 1
scsiplug 72 3 0 3 1 0 1 1 0 8 1
scxspl 216 9942 0 9939 4 3 1 3 1 8 0
plimitpl 152 185 0 175 1 0 1 1 0 8 0
sigapl 424 653 0 620 7 1 6 7 0 8 0
knotepl 120 278 0 0 9 0 9 9 0 8 0
kqueuepl 224 60 0 59 1 0 1 1 0 8 0
pipepl 344 134 0 107 3 0 3 3 0 8 0
fdescpl 528 637 0 620 3 0 3 3 0 8 0
filepl 160 3120 0 2952 13 0 13 13 0 8 3
lockfpl 104 134 0 129 1 0 1 1 0 8 0
lockfspl 48 67 0 62 1 0 1 1 0 8 0
sessionpl 144 94 0 91 1 0 1 1 0 8 0
pgrppl 48 102 0 91 1 0 1 1 0 8 0
ucredpl 104 718 0 712 1 0 1 1 0 8 0
zombiepl 144 620 0 620 1 0 1 1 0 8 1
processpl 1232 653 0 620 5 1 4 5 0 8 0
procpl 664 962 0 918 6 0 6 6 0 8 1
sockpl 752 462 0 458 8 0 8 8 0 8 7
mcl64k 65536 7 0 0 1 0 1 1 0 8 0
mcl16k 16384 4 0 0 1 0 1 1 0 8 0
mcl9k128 9344 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 126 0 0 16 0 16 16 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 20 0 0 3 0 3 3 0 8 0
mtagpl 96 6 0 0 1 0 1 1 0 8 0
mbufpl 256 154 0 0 10 0 10 10 0 8 0
bufpl 272 5833 0 105 382 0 382 382 0 8 0
anonpl 32 5694 0 0 46 0 46 46 0 246 0
amapchunkpl 152 14615 0 14267 23 0 23 23 0 158 8
amappl16 200 1953 0 1918 17 3 14 14 0 8 12
amappl15 192 24 0 24 2 2 0 1 0 8 0
amappl14 184 436 0 436 1 0 1 1 0 8 1
amappl13 176 126 0 125 1 0 1 1 0 8 0
amappl12 168 887 0 871 2 0 2 2 0 8 0
amappl11 160 6 0 6 1 1 0 1 0 8 0
amappl10 152 91 0 91 1 0 1 1 0 8 1
amappl9 144 277 0 277 1 1 0 1 0 8 0
amappl8 136 99 0 99 1 0 1 1 0 8 1
amappl7 128 149 0 147 1 0 1 1 0 8 0
amappl6 120 190 0 190 1 0 1 1 0 8 1
amappl5 112 191 0 190 1 0 1 1 0 8 0
amappl4 104 295 0 292 1 0 1 1 0 8 0
amappl3 96 2788 0 2710 3 0 3 3 0 8 0
amappl2 88 543 0 535 2 0 2 2 0 8 0
amappl1 80 11415 0 11301 14 0 14 14 0 8 7
amappl 88 4004 0 3889 4 0 4 4 0 92 0
uvmvnodes 80 108 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 128 255 0 255 2 1 1 1 0 8 1
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 8 0 0 1 0 1 1 0 8 0
uaddrrnd 24 637 0 620 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 637 0 620 1 0 1 1 0 8 0
vmmpekpl 168 7022 0 6987 2 0 2 2 0 8 0
vmmpepl 168 49308 0 48533 86 0 86 86 0 357 45
vmsppl 488 636 0 620 5 0 5 5 0 8 1
rwobjpl 80 16739 0 16287 24 1 23 24 0 8 2
pdppl 4096 1281 0 1240 101 54 47 85 0 8 6
pvpl 32 10377 0 0 84 0 84 84 0 265 0
pmappl 256 636 0 620 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 662 0 57 18 0 18 18 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}>