Wpanic:IkNeGr:n SPel Ld iNaOTn oLOstERiEc aDs sOeNr tSiYoSnCA"p 8s-3p-10vnco4nt7= XI"T fa iled:Stopped at savectx+0xae: movl $0,%gs:0x680
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*305739 95577 0 0 0x4000000 0 syz-executor
savectx() at savectx+0xae
end of kernel
end trace frame: 0xd4081a0d690, 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: kernel diagnostic assertion "ps->ps_uvncount == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_unveil.c", line 188
ddb{0}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0xd4081a0d690, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80003c5d9c80
rbx 0
rdx 0xffff800001461c80
rcx 0xffff8000ffff6cd0
rax 0x3c
r8 0xffff80003c5d9bb0
r9 0
r10 0xbba0f174a97fd919
r11 0xdf2451ee762b321a
r12 0
r13 0
r14 0xffff8000ffff6cd0
r15 0
rip 0xffffffff832643ee savectx+0xae
cs 0x8
rflags 0x46
rsp 0xffff80003c5d9c00
ss 0x10
savectx+0xae: movl $0,%gs:0x680
ddb{0}> show proc
PROC (syz-executor) tid=305739 pid=95577 tcnt=3 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000ffff7c00,0xffff8000338ac550
process=0xffff80003c541498 user=0xffff80003c5d4000, vmspace=0xfffffd8078f4fca8
estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
50944 134914 2660 0 2 0 syz-executor
50944 220752 2660 0 3 0x4000080 fsleep syz-executor
50944 430366 2660 0 3 0x4000080 fsleep syz-executor
95577 128460 98964 0 2 0 syz-executor
*95577 305739 98964 0 7 0x4000000 syz-executor
95577 507676 98964 0 3 0x4000080 fsleep syz-executor
21871 231965 91287 0 2 0x2 syz-executor
42734 338902 1 0 3 0x80 nanoslp init
37498 281667 91287 0 3 0x2 biowait syz-executor
31527 411210 91287 0 3 0x82 nanoslp syz-executor
75430 70633 91287 0 2 0x2 syz-executor
98964 352134 91287 0 3 0x82 nanoslp syz-executor
54288 100954 0 0 3 0x14280 nfsidl nfsio
44425 434554 0 0 3 0x14280 nfsidl nfsio
45986 441192 0 0 3 0x14280 nfsidl nfsio
20719 353304 0 0 3 0x14280 nfsidl nfsio
6182 357403 0 0 3 0x14280 nfsidl nfsio
15520 140312 0 0 3 0x14280 nfsidl nfsio
75297 18294 0 0 3 0x14280 nfsidl nfsio
99085 446760 0 0 3 0x14280 nfsidl nfsio
59440 283582 0 0 3 0x14280 nfsidl nfsio
88211 378773 0 0 3 0x14280 nfsidl nfsio
78453 342850 0 0 3 0x14280 nfsidl nfsio
59888 70238 0 0 3 0x14280 nfsidl nfsio
12571 474711 0 0 3 0x14280 nfsidl nfsio
48075 143135 0 0 3 0x14280 nfsidl nfsio
93975 171597 0 0 3 0x14280 nfsidl nfsio
52827 420245 0 0 3 0x14280 nfsidl nfsio
40998 55502 0 0 3 0x14280 nfsidl nfsio
69017 144513 0 0 3 0x14280 nfsidl nfsio
49111 428791 0 0 3 0x14280 nfsidl nfsio
80240 466907 0 0 3 0x14280 nfsidl nfsio
8719 140237 0 0 3 0x14200 bored sosplice
2660 249157 91287 0 3 0x82 nanoslp syz-executor
55468 335941 91287 0 3 0x82 wait syz-executor
59624 122727 91287 0 3 0x2 biowait syz-executor
91287 252654 74434 0 3 0x82 kqread syz-executor
74434 442493 79143 0 3 0x10008a sigsusp ksh
79143 30346 29123 0 3 0x98 kqread sshd-session
29123 158024 85759 0 3 0x92 kqread sshd-session
85759 358909 1 0 3 0x88 kqread sshd
50884 183908 521 74 3 0x1100092 bpf pflogd
521 191661 1 0 3 0x80 sbwait pflogd
83668 282430 2453 73 3 0x1100090 kqread syslogd
2453 136928 1 0 3 0x100082 sbwait syslogd
7736 426208 1 0 3 0x100080 kqread resolvd
279 514042 34699 77 3 0x100092 kqread dhcpleased
51827 388638 34699 77 3 0x100092 kqread dhcpleased
34699 116673 1 0 3 0x80 kqread dhcpleased
29274 513967 0 0 3 0x14200 bored smr
32507 421439 0 0 3 0x14200 pgzero zerothread
97809 154657 0 0 3 0x14200 aiodoned aiodoned
8235 251890 0 0 3 0x14200 syncer update
344 407637 0 0 3 0x14200 cleaner cleaner
37020 192195 0 0 3 0x14200 reaper reaper
41362 410178 0 0 3 0x14200 pgdaemon pagedaemon
84614 67301 0 0 3 0x14200 bored viomb
35631 157343 0 0 3 0x40014200 acpi0 acpi0
94278 520468 0 0 3 0x40014200 idle1
47727 272557 0 0 3 0x14200 bored softnet3
51215 199831 0 0 3 0x14200 bored softnet2
30642 151767 0 0 3 0x14200 bored softnet1
59014 102702 0 0 3 0x14200 bored softnet0
35672 478030 0 0 3 0x14200 bored systqmp
21247 365178 0 0 3 0x14200 bored systq
40136 308210 0 0 3 0x14200 tmoslp softclockmp
35112 118540 0 0 3 0x40014200 tmoslp softclock
54735 169 0 0 3 0x40014200 idle0
1 4011 0 0 3 0x80082 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &sched_lock r = 0 (0xffffffff8397e690)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1155
#1 mtx_enter_try+0x178
#2 mtx_enter+0x60 sys/kern/kern_lock.c:239
#3 sleep_finish+0x24f sys/kern/kern_synch.c:414
#4 rwsleep+0xf2 sys/kern/kern_synch.c:300
#5 futex_wait+0x372 sys/kern/sys_futex.c:250
#6 sys_futex+0x149 sys/kern/sys_futex.c:101
#7 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#7 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577
#8 Xsyscall+0x128
Process 37498 (syz-executor) thread 0xffff80003c5cfc18 (281667)
Process 59624 (syz-executor) thread 0xffff8000ffffaf40 (122727)
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10229 11048K 11486K 166960K 15940 0
pcb 18 18K 20K 166960K 675 0
rtable 218 8K 9K 166960K 1383 0
pf 38 18K 22K 166960K 297 0
ifaddr 39 7K 7K 166960K 204 0
ifgroup 51 2K 2K 166960K 227 0
sysctl 4 1K 1K 166960K 6 0
counters 62 36K 36K 166960K 236 0
ioctlops 0 0K 4K 166960K 2076 0
iov 0 0K 22K 166960K 253 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1499 94K 94K 166960K 4166 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 3 5K 17K 166960K 70 0
VM map 2 1K 1K 166960K 2 0
sem 29 11K 11K 166960K 143 0
dirhash 12 2K 2K 166960K 63 0
ACPI 1690 195K 286K 166960K 12468 0
file desc 15 53K 89K 166960K 2893 0
sigio 0 0K 0K 166960K 59 0
proc 67 103K 140K 166960K 963 0
subproc 72 4K 4K 166960K 126 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 534 0
in_multi 81 5K 7K 166960K 695 0
ether_multi 1 0K 0K 166960K 10 0
mrt 0 0K 0K 166960K 5 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 241 1076K 1076K 166960K 241 0
exec 0 0K 1K 166960K 1076 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 6 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 235 73K 88K 166960K 29388 0
UVM aobj 131 12K 12K 166960K 141 0
pinsyscall 40 80K 103K 166960K 4204 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 246 0
NDP 12 0K 2K 166960K 166 0
temp 78 8644K 8900K 166960K 135550 0
kqueue 13 20K 36K 166960K 507 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 24 0 0 1 0 1 1 0 8 0
rtpcb 120 275 0 272 3 2 1 2 0 8 0
rtentry 112 522 0 427 4 0 4 4 0 8 0
unpcb 144 3448 0 3431 18 17 1 7 0 8 0
syncache 336 16 0 16 4 3 1 1 0 8 1
tcpqe 32 6 0 6 4 3 1 1 0 8 1
tcpcb 808 923 0 915 26 18 8 8 0 8 6
arp 120 45 0 27 1 0 1 1 0 8 0
inpcb 376 4489 0 4474 59 50 9 15 0 8 7
ip6q 72 1 0 1 1 1 0 1 0 8 0
ip6af 40 2 0 2 1 1 0 1 0 8 0
nd6 136 133 0 110 1 0 1 1 0 8 0
pkpcb 40 55 0 55 6 5 1 1 0 8 1
kcovpl 48 14 0 6 1 0 1 1 0 8 0
ppxss 1168 58 0 58 4 4 0 1 0 8 0
pppxif 1472 35 0 35 2 2 0 1 0 8 0
pfstscr 40 4 0 3 1 0 1 1 0 8 0
pffrag 232 16 0 9 1 0 1 1 0 482 0
pffrnode 88 15 0 9 1 0 1 1 0 8 0
pffrent 40 31 0 24 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 2 0 1 1 0 1 1 0 8 0
pfanchor 1288 5 0 1 2 1 1 1 0 8 0
pftag 88 4 0 1 1 0 1 1 0 8 0
pfstitem 24 175 0 124 1 0 1 1 0 8 0
pfstkey 128 181 0 128 3 0 3 3 0 8 0
pfstate 376 177 0 128 8 0 8 8 0 8 0
pfrule 1344 51 0 39 4 2 2 2 0 8 1
art_heap8 4096 4 0 0 4 0 4 4 0 8 0
art_heap4 256 2788 0 2356 36 9 27 30 0 8 0
art_table 32 2792 0 2356 4 0 4 4 0 8 0
art_node 16 519 0 437 1 0 1 1 0 8 0
sysvmsgpl 40 11 0 4 1 0 1 1 0 8 0
semupl 112 3 0 3 3 3 0 1 0 8 0
semapl 112 70 0 43 1 0 1 1 0 8 0
shmpl 112 138 0 10 4 0 4 4 0 8 0
dirhash 1024 52 0 35 3 0 3 3 0 8 0
dino2pl 256 6734 0 5228 95 0 95 95 0 8 0
ffsino 280 6734 0 5228 109 0 109 109 0 8 0
nchpl 144 10766 0 10213 64 39 25 64 0 8 0
rtmask 32 2 0 2 2 2 0 1 0 8 0
uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0
vnodes 216 5926 0 0 330 0 330 330 0 8 0
namei 1024 40135 0 40134 3 2 1 2 0 8 0
percpumem 16 132 0 87 1 0 1 1 0 8 0
kstatmem 264 122 0 100 2 0 2 2 0 8 0
acpiwqpl 32 1 0 1 1 0 1 1 1 8 1
scsiplug 72 12 0 12 3 3 0 1 0 8 0
scxspl 216 32193 0 32191 13 12 1 8 1 8 0
plimitpl 152 775 0 758 1 0 1 1 0 8 0
sigapl 424 3220 0 3151 11 2 9 9 0 8 0
futexpl 64 41862 0 41859 1 0 1 1 0 8 0
knotepl 120 618 0 0 17 0 17 17 0 8 0
kqueuepl 216 1124 0 1113 18 15 3 5 0 8 2
pipepl 328 666 0 638 13 5 8 8 0 8 5
fdescpl 504 3178 0 3149 6 1 5 5 0 8 0
filepl 152 25450 0 25226 40 25 15 20 0 8 3
lockfpl 104 1210 0 1207 2 1 1 2 0 8 0
lockfspl 48 428 0 425 1 0 1 1 0 8 0
sessionpl 144 44 0 36 1 0 1 1 0 8 0
pgrppl 48 123 0 107 1 0 1 1 0 8 0
ucredpl 104 3771 0 3757 1 0 1 1 0 8 0
zombiepl 144 4014 0 4010 1 0 1 1 0 8 0
processpl 1168 3220 0 3151 7 1 6 6 0 8 0
procpl 648 8002 0 7929 9 1 8 8 0 8 0
srpgc 96 13 0 13 3 3 0 1 0 8 0
sosppl 168 8 0 8 3 3 0 1 0 8 0
sockpl 688 8307 0 8275 82 72 10 22 0 8 6
mcl64k 65536 4 0 0 1 0 1 1 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 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 117 0 0 14 0 14 14 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 106 0 0 13 0 13 13 0 8 0
mtagpl 96 149 0 0 4 0 4 4 0 8 0
mbufpl 256 1430 0 0 86 0 86 86 0 8 0
bufpl 280 8598 0 2443 440 0 440 440 0 8 0
anonpl 24 385436 0 379931 102 50 52 59 0 184 5
amapchunkpl 152 95128 0 94539 46 20 26 34 0 158 0
amappl16 200 7439 0 7369 46 37 9 17 0 8 0
amappl15 192 7 0 7 1 1 0 1 0 8 0
amappl14 184 172 0 161 1 0 1 1 0 8 0
amappl13 176 8 0 8 2 2 0 1 0 8 0
amappl12 168 3926 0 3897 4 2 2 3 0 8 0
amappl11 160 51 0 37 1 0 1 1 0 8 0
amappl10 152 4 0 3 2 1 1 1 0 8 0
amappl9 144 246 0 246 1 1 0 1 0 8 0
amappl8 136 40 0 37 1 0 1 1 0 8 0
amappl7 128 136 0 124 1 0 1 1 0 8 0
amappl6 120 253 0 249 1 0 1 1 0 8 0
amappl5 112 154 0 143 1 0 1 1 0 8 0
amappl4 104 411 0 390 1 0 1 1 0 8 0
amappl3 96 20089 0 19978 4 0 4 4 0 8 0
amappl2 88 876 0 811 2 0 2 2 0 8 0
amappl1 80 19503 0 18962 15 0 15 15 0 8 0
amappl 88 28701 0 28520 5 0 5 5 0 92 0
dma32768 32768 1 0 1 1 1 0 1 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 2 0 1 0 8 0
dma64 64 8 0 8 3 3 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 72 140 0 10 3 0 3 3 0 8 0
uaddrrnd 24 3178 0 3148 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 3178 0 3148 1 0 1 1 0 8 0
vmmpekpl 168 25986 0 25932 3 0 3 3 0 8 0
vmmpepl 168 198586 0 196738 117 25 92 98 0 357 1
vmsppl 456 3177 0 3148 7 2 5 5 0 8 0
rwobjpl 64 56832 0 49821 121 5 116 118 0 8 0
pdppl 4096 6363 0 6296 143 72 71 83 0 8 4
pvpl 32 17514 0 0 141 0 141 141 0 265 0
pmappl 248 3177 0 3148 3 0 3 3 0 8 0
extentpl 40 55 0 38 1 0 1 1 0 8 0
phpool 112 451 0 113 10 0 10 10 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0xd4081a0d690, count: -1
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff800029aabff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:654
comcnputc(800,3a) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline]
comcnputc(800,3a) at comcnputc+0x250 sys/dev/ic/com.c:1269
cnputc(3a) at cnputc+0x61 sys/dev/cons.c:218
db_putchar(3a) at db_putchar+0x65c sys/ddb/db_output.c:155
kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065
db_printf(ffffffff833cf72b) at db_printf+0x9b
panic(ffffffff8343b582) at panic+0x103 sys/kern/subr_prf.c:216
__assert(ffffffff833e7d34,ffffffff8339e492,bc,ffffffff833580a4) at __assert+0x29
unveil_destroy(ffff80003c544238) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188
exit1(ffff8000ffff76f0,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233
sys_exit(ffff8000ffff76f0,ffff80003c50aa30,ffff80003c50a980) at sys_exit+0x1a
end trace frame: 0xffff80003c50aa20, count: 0
ddb{1}> trace
x86_ipi_db(ffff800029aabff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:654
comcnputc(800,3a) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline]
comcnputc(800,3a) at comcnputc+0x250 sys/dev/ic/com.c:1269
cnputc(3a) at cnputc+0x61 sys/dev/cons.c:218
db_putchar(3a) at db_putchar+0x65c sys/ddb/db_output.c:155
kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065
db_printf(ffffffff833cf72b) at db_printf+0x9b
panic(ffffffff8343b582) at panic+0x103 sys/kern/subr_prf.c:216
__assert(ffffffff833e7d34,ffffffff8339e492,bc,ffffffff833580a4) at __assert+0x29
unveil_destroy(ffff80003c544238) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188
exit1(ffff8000ffff76f0,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233
sys_exit(ffff8000ffff76f0,ffff80003c50aa30,ffff80003c50a980) at sys_exit+0x1a
syscall(ffff80003c50aa30) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c50aa30) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7e883b045d10, count: -16