panic: lock (rwlock) vcpulock not locked

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Sep 1, 2021, 12:48:23 AMSep 1
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Hello,

syzbot found the following issue on:

HEAD commit: 444296aeff58 Honour netinet6 when generating symlinks to t..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=16fb6385300000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=1dab11e14aa7a159cadf
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1208fb23300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11f507de300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1dab11...@syzkaller.appspotmail.com

panic: lock (rwlock) vcpulock not locked
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*281555 56206 0 0 0 1 syz-executor9310
75593 81265 0 0x12 0x8 0 sshd
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82431be5) at panic+0x177 sys/kern/subr_prf.c:202
witness_assert(ffff800021234bb0,4) at witness_assert+0x3ef sys/kern/subr_witness.c:1950
vcpu_reload_vmcs_vmx(ffff800021234800) at vcpu_reload_vmcs_vmx+0x30 sys/arch/amd64/amd64/vmm.c:1768
vcpu_writeregs_vmx(ffff800021234800,b3,1,ffff800000b07410) at vcpu_writeregs_vmx+0x4a sys/arch/amd64/amd64/vmm.c:2096
vmmioctl(a00,82485608,ffff800000b07400,1,ffff80002121efc0) at vmmioctl+0x175
VOP_IOCTL(fffffd806e4f3ad0,82485608,ffff800000b07400,1,fffffd807f7d8780,ffff80002121efc0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd806e49ca28,82485608,ffff800000b07400,ffff80002121efc0) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff80002121efc0,ffff8000212311d8,ffff800021231220) at sys_ioctl+0x4a2
syscall(ffff8000212312a0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000212312a0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffffac70, count: 4
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
*cpu1: lock (rwlock) vcpulock not locked
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82431be5) at panic+0x177 sys/kern/subr_prf.c:202
witness_assert(ffff800021234bb0,4) at witness_assert+0x3ef sys/kern/subr_witness.c:1950
vcpu_reload_vmcs_vmx(ffff800021234800) at vcpu_reload_vmcs_vmx+0x30 sys/arch/amd64/amd64/vmm.c:1768
vcpu_writeregs_vmx(ffff800021234800,b3,1,ffff800000b07410) at vcpu_writeregs_vmx+0x4a sys/arch/amd64/amd64/vmm.c:2096
vmmioctl(a00,82485608,ffff800000b07400,1,ffff80002121efc0) at vmmioctl+0x175
VOP_IOCTL(fffffd806e4f3ad0,82485608,ffff800000b07400,1,fffffd807f7d8780,ffff80002121efc0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd806e49ca28,82485608,ffff800000b07400,ffff80002121efc0) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff80002121efc0,ffff8000212311d8,ffff800021231220) at sys_ioctl+0x4a2
syscall(ffff8000212312a0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000212312a0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffffac70, count: -11
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800021230cb0
rbx 0xffff800020d39bff
rdx 0x8b
rcx 0x2
rax 0x29
r8 0xffffffff81a0be34 kprintf+0x144
r9 0x1
r10 0x29245c6bdc66ef74
r11 0x2b74850c5937833
r12 0xffff800020d39a00
r13 0
r14 0
r15 0x1
rip 0xffffffff81e3e908 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800021230ca0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor9310) pid=281555 stat=onproc
flags process=0 proc=0
pri=55, usrpri=55, nice=20
forw=0xffffffffffffffff, list=0xffff80002121ed20,0xffffffff82913618
process=0xffff80002120a190 user=0xffff80002122c000, vmspace=0xfffffd806f1beb88
estcpu=10, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*56206 281555 64067 0 7 0 syz-executor9310
64067 199194 54285 0 3 0x82 nanoslp syz-executor9310
54285 49588 81265 0 3 0x10008a sigsusp ksh
81265 75593 5606 0 7 0x1a sshd
68922 469208 1 0 3 0x100083 ttyin getty
5606 413813 1 0 3 0x88 select sshd
92223 306765 93454 74 3 0x100092 bpf pflogd
93454 407883 1 0 3 0x80 netio pflogd
33558 429473 44225 73 3 0x100090 kqread syslogd
44225 470534 1 0 3 0x100082 netio syslogd
51182 150900 1 0 3 0x100080 kqread resolvd
34615 315689 50440 77 3 0x100092 kqread dhcpleased
7043 388100 50440 77 3 0x100092 kqread dhcpleased
50440 281101 1 0 3 0x80 kqread dhcpleased
80480 345808 0 0 3 0x14200 bored smr
73601 308887 0 0 3 0x14200 pgzero zerothread
1549 342978 0 0 3 0x14200 aiodoned aiodoned
16878 413252 0 0 3 0x14200 syncer update
75734 138900 0 0 3 0x14200 cleaner cleaner
24078 42306 0 0 3 0x14200 reaper reaper
28978 467441 0 0 3 0x14200 pgdaemon pagedaemon
48926 389136 0 0 3 0x14200 bored crynlk
85269 106349 0 0 3 0x14200 bored crypto
39118 150192 0 0 3 0x14200 bored viomb
80353 184756 0 0 3 0x40014200 acpi0 acpi0
12246 449722 0 0 3 0x40014200 idle1
45108 148239 0 0 2 0x14200 softnet
12088 149797 0 0 3 0x14200 bored systqmp
63724 509842 0 0 3 0x14200 bored systq
74356 293773 0 0 3 0x40014200 bored softclock
46199 290697 0 0 3 0x40014200 idle0
1 41103 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 81265 (sshd) thread 0xffff80002121e2a0 (75593)
exclusive rwlock netlock r = 0 (0xffffffff827cea90)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 solock+0x86 sys/kern/uipc_socket2.c:295
#2 sosend+0x22a sys/kern/uipc_socket.c:506
#3 dofilewritev+0x1a3 sys/kern/sys_generic.c:365
#4 sys_write+0x83 sys/kern/sys_generic.c:285
#5 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#5 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#6 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10111 6416K 6417K 78643K 11201 0
pcb 13 8K 8K 78643K 13 0
rtable 62 2K 2K 78643K 112 0
ifaddr 29 8K 8K 78643K 30 0
counters 40 33K 33K 78643K 40 0
ioctlops 1 1K 4K 78643K 1482 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 6 0
vnodes 1183 74K 75K 78643K 1188 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 1K 1K 78643K 2 0
sem 2 0K 0K 78643K 2 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 1 0K 0K 78643K 1 0
proc 67 87K 87K 78643K 278 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 19 95K 95K 78643K 19 0
exec 0 0K 2K 78643K 348 0
pagedep 1 8K 8K 78643K 1 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 7 26K 26K 78643K 7 0
UVM amap 84 20K 20K 78643K 1736 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 4 0K 0K 78643K 4 0
temp 23 4193K 4257K 78643K 1966 0
kqueue 9 12K 12K 78643K 9 0
SYN cache 2 16K 16K 78643K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 22 0 0 1 0 1 1 0 8 0
rtpcb 120 17 0 14 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 120 35 0 20 1 0 1 1 0 8 0
syncache 296 5 0 5 2 1 1 1 0 8 1
tcpcb 736 8 0 5 1 0 1 1 0 8 0
arp 120 2 0 0 1 0 1 1 0 8 0
inpcb 304 32 0 26 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
pfstitem 24 9 0 2 1 0 1 1 0 8 0
pfstkey 112 9 0 2 1 0 1 1 0 8 0
pfstate 320 9 0 2 1 0 1 1 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 97 0 0 7 0 7 7 0 8 0
art_table 32 98 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 1413 0 23 87 0 87 87 0 8 0
ffsino 272 1413 0 23 93 0 93 93 0 8 0
nchpl 144 1588 0 40 58 0 58 58 0 8 0
uvmvnodes 72 1423 0 0 26 0 26 26 0 8 0
vnodes 224 1423 0 0 84 0 84 84 0 8 0
namei 1024 4149 0 4149 2 1 1 1 0 8 1
percpumem 16 32 0 0 1 0 1 1 0 8 0
vcpupl 2048 1 0 0 1 0 1 1 0 8 0
vmpool 560 1 0 0 1 0 1 1 0 8 0
scxspl 216 3685 0 3685 10 9 1 8 0 8 1
plimitpl 152 16 0 9 1 0 1 1 0 8 0
sigapl 424 257 0 225 5 0 5 5 0 8 0
knotepl 112 23 0 0 1 0 1 1 0 8 0
kqueuepl 216 5 0 0 1 0 1 1 0 8 0
pipepl 336 69 0 66 2 1 1 1 0 8 0
fdescpl 496 241 0 225 3 0 3 3 0 8 0
filepl 152 1087 0 1028 3 0 3 3 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 18 0 9 1 0 1 1 0 8 0
pgrppl 48 18 0 9 1 0 1 1 0 8 0
ucredpl 96 69 0 57 1 0 1 1 0 8 0
zombiepl 144 225 0 225 2 1 1 1 0 8 1
processpl 1072 257 0 225 3 0 3 3 0 8 0
procpl 672 257 0 225 4 0 4 4 0 8 0
sockpl 480 84 0 60 5 1 4 4 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 82 0 0 11 1 10 11 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 129 0 0 9 0 9 9 0 8 0
bufpl 280 2013 0 93 138 0 138 138 0 8 0
anonpl 24 32796 0 30485 18 3 15 17 0 186 1
amapchunkpl 152 3023 0 2879 8 1 7 8 0 158 0
amappl16 200 97 0 92 1 0 1 1 0 8 0
amappl15 192 1 0 0 1 0 1 1 0 8 0
amappl13 176 20 0 18 1 0 1 1 0 8 0
amappl12 168 1 0 1 1 1 0 1 0 8 0
amappl11 160 42 0 28 1 0 1 1 0 8 0
amappl10 152 23 0 19 1 0 1 1 0 8 0
amappl9 144 21 0 18 1 0 1 1 0 8 0
amappl8 136 272 0 272 2 1 1 1 0 8 1
amappl7 128 52 0 45 1 0 1 1 0 8 0
amappl6 120 87 0 82 1 0 1 1 0 8 0
amappl5 112 577 0 560 1 0 1 1 0 8 0
amappl4 104 525 0 506 1 0 1 1 0 8 0
amappl3 96 49 0 46 1 0 1 1 0 8 0
amappl2 88 403 0 357 3 1 2 2 0 8 0
amappl1 80 7573 0 7191 11 2 9 9 0 8 0
amappl 88 1491 0 1425 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 64 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 242 0 225 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 242 0 225 1 0 1 1 0 8 0
vmmpekpl 168 6006 0 5988 1 0 1 1 0 8 0
vmmpepl 168 22906 0 22038 44 3 41 41 0 357 1
vmsppl 368 241 0 225 2 0 2 2 0 8 0
rwobjpl 56 7216 0 6660 11 2 9 9 0 8 1
pdppl 4096 492 0 451 64 22 42 48 0 8 1
pvpl 32 112040 0 107824 42 4 38 38 0 265 1
pmappl 224 241 0 225 2 0 2 2 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 290 0 28 8 0 8 8 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffffffff82809ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x5f sys/dev/kcov.c:149
__mp_lock(ffffffff82838a18) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline]
__mp_lock(ffffffff82838a18) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline]
__mp_lock(ffffffff82838a18) at __mp_lock+0xa1 sys/kern/kern_lock.c:142
__mp_acquire_count(ffffffff82838a18,1) at __mp_acquire_count+0x4c sys/kern/kern_lock.c:227
tsleep(ffffffff8292d680,118,ffffffff824f0138,0) at tsleep+0x172
dopselect(ffff80002121e2a0,a,9812625fea0,980d6f0da20,0,0) at dopselect+0x712 sys/kern/sys_generic.c:657
sys_pselect(ffff80002121e2a0,ffff800021211a50,ffff800021211aa0) at sys_pselect+0x13a sys/kern/sys_generic.c:579
syscall(ffff800021211b20) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800021211b20) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffcbef0, count: 4
ddb{0}> trace
x86_ipi_db(ffffffff82809ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x5f sys/dev/kcov.c:149
__mp_lock(ffffffff82838a18) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline]
__mp_lock(ffffffff82838a18) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline]
__mp_lock(ffffffff82838a18) at __mp_lock+0xa1 sys/kern/kern_lock.c:142
__mp_acquire_count(ffffffff82838a18,1) at __mp_acquire_count+0x4c sys/kern/kern_lock.c:227
tsleep(ffffffff8292d680,118,ffffffff824f0138,0) at tsleep+0x172
dopselect(ffff80002121e2a0,a,9812625fea0,980d6f0da20,0,0) at dopselect+0x712 sys/kern/sys_generic.c:657
sys_pselect(ffff80002121e2a0,ffff800021211a50,ffff800021211aa0) at sys_pselect+0x13a sys/kern/sys_generic.c:579
syscall(ffff800021211b20) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800021211b20) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffcbef0, count: -11
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x18: addq $0x8,%rsp
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82431be5) at panic+0x177 sys/kern/subr_prf.c:202
witness_assert(ffff800021234bb0,4) at witness_assert+0x3ef sys/kern/subr_witness.c:1950
vcpu_reload_vmcs_vmx(ffff800021234800) at vcpu_reload_vmcs_vmx+0x30 sys/arch/amd64/amd64/vmm.c:1768
vcpu_writeregs_vmx(ffff800021234800,b3,1,ffff800000b07410) at vcpu_writeregs_vmx+0x4a sys/arch/amd64/amd64/vmm.c:2096
vmmioctl(a00,82485608,ffff800000b07400,1,ffff80002121efc0) at vmmioctl+0x175
VOP_IOCTL(fffffd806e4f3ad0,82485608,ffff800000b07400,1,fffffd807f7d8780,ffff80002121efc0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd806e49ca28,82485608,ffff800000b07400,ffff80002121efc0) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff80002121efc0,ffff8000212311d8,ffff800021231220) at sys_ioctl+0x4a2
syscall(ffff8000212312a0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000212312a0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffffac70, count: 4
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82431be5) at panic+0x177 sys/kern/subr_prf.c:202
witness_assert(ffff800021234bb0,4) at witness_assert+0x3ef sys/kern/subr_witness.c:1950
vcpu_reload_vmcs_vmx(ffff800021234800) at vcpu_reload_vmcs_vmx+0x30 sys/arch/amd64/amd64/vmm.c:1768
vcpu_writeregs_vmx(ffff800021234800,b3,1,ffff800000b07410) at vcpu_writeregs_vmx+0x4a sys/arch/amd64/amd64/vmm.c:2096
vmmioctl(a00,82485608,ffff800000b07400,1,ffff80002121efc0) at vmmioctl+0x175
VOP_IOCTL(fffffd806e4f3ad0,82485608,ffff800000b07400,1,fffffd807f7d8780,ffff80002121efc0) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:295
vn_ioctl(fffffd806e49ca28,82485608,ffff800000b07400,ffff80002121efc0) at vn_ioctl+0xba sys/kern/vfs_vnops.c:531
sys_ioctl(ffff80002121efc0,ffff8000212311d8,ffff800021231220) at sys_ioctl+0x4a2
syscall(ffff8000212312a0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000212312a0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffffac70, count: -11
ddb{1}>


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