login: witness: exclusive lock of (rwlock) vmmaplk while share locked
panic: share->excl
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*113695 65708 0 0x2 0 0K syz-executor3957314175
169270 17344 0 0x12 0 1 sshd
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8257690f) at panic+0x177 sys/kern/subr_prf.c:202
witness_checkorder(fffffd800872ea28,9,0) at witness_checkorder+0x11bd witness_debugger sys/kern/subr_witness.c:2505 [inline]
witness_checkorder(fffffd800872ea28,9,0) at witness_checkorder+0x11bd sys/kern/subr_witness.c:772
rw_enter(fffffd800872ea18,21) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
vm_map_lock_ln(fffffd800872ea10,0,1000) at vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5466
uvm_map_extract(fffffd800872ea10,7f7ffffd1000,1000,ffff8000211c1a30,0) at uvm_map_extract+0x173 sys/uvm/uvm_map.c:4530
uvm_io(fffffd800872ea10,ffff8000211c1ac8,0) at uvm_io+0x127 sys/uvm/uvm_io.c:100
sysctl_proc_args(ffff8000211c1f18,2,20000080,ffff8000211c1f48,ffff8000ffff6010) at sysctl_proc_args+0x24b sys/kern/kern_sysctl.c:1790
kern_sysctl(ffff8000211c1f14,3,20000080,ffff8000211c1f48,0,0,99898603ac1efdc2) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449
sys_sysctl(ffff8000ffff6010,ffff8000211c1fb8,ffff8000211c2010) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249
syscall(ffff8000211c2080) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000211c2080) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffd1140, count: 3
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
*cpu0: share->excl
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8257690f) at panic+0x177 sys/kern/subr_prf.c:202
witness_checkorder(fffffd800872ea28,9,0) at witness_checkorder+0x11bd witness_debugger sys/kern/subr_witness.c:2505 [inline]
witness_checkorder(fffffd800872ea28,9,0) at witness_checkorder+0x11bd sys/kern/subr_witness.c:772
rw_enter(fffffd800872ea18,21) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
vm_map_lock_ln(fffffd800872ea10,0,1000) at vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5466
uvm_map_extract(fffffd800872ea10,7f7ffffd1000,1000,ffff8000211c1a30,0) at uvm_map_extract+0x173 sys/uvm/uvm_map.c:4530
uvm_io(fffffd800872ea10,ffff8000211c1ac8,0) at uvm_io+0x127 sys/uvm/uvm_io.c:100
sysctl_proc_args(ffff8000211c1f18,2,20000080,ffff8000211c1f48,ffff8000ffff6010) at sysctl_proc_args+0x24b sys/kern/kern_sysctl.c:1790
kern_sysctl(ffff8000211c1f14,3,20000080,ffff8000211c1f48,0,0,99898603ac1efdc2) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449
sys_sysctl(ffff8000ffff6010,ffff8000211c1fb8,ffff8000211c2010) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249
syscall(ffff8000211c2080) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000211c2080) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffd1140, count: -12
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000211c1690
rbx 0xffffffff829bbbff cpu_info_full_primary+0x2bff
rdx 0x3fd
rcx 0
rax 0x13
r8 0x101010101010101
r9 0x8080808080808080
r10 0xee9c8df8b92c7d45
r11 0xaccdb1dc1d9c1e9a
r12 0xffffffff829bba00 cpu_info_full_primary+0x2a00
r13 0
r14 0
r15 0x1
rip 0xffffffff8138d658 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000211c1680
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor3957314175) pid=113695 stat=onproc
flags process=2<EXEC> proc=0
pri=50, usrpri=50, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffff62b0,0xffffffff82b3d400
process=0xffff80002116c438 user=0xffff8000211bd000, vmspace=0xfffffd800872ea10
estcpu=0, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*65708 113695 69200 0 7 0x2 syz-executor3957314175
69200 115287 17344 0 3 0x10008a sigsusp ksh
17344 169270 83724 0 7 0x12 sshd
38883 403732 1 0 3 0x100083 ttyin getty
83724 54595 1 0 3 0x88 kqread sshd
4896 306634 963 73 3 0x1100090 kqread syslogd
963 290255 1 0 3 0x100082 netio syslogd
82198 131956 1 0 3 0x100080 kqread resolvd
18661 67631 12859 77 3 0x100092 kqread dhcpleased
25981 113973 12859 77 3 0x100092 kqread dhcpleased
12859 21825 1 0 3 0x80 kqread dhcpleased
35955 75859 0 0 3 0x14200 bored smr
55522 276782 0 0 3 0x14200 pgzero zerothread
62851 429170 0 0 3 0x14200 aiodoned aiodoned
82567 471426 0 0 3 0x14200 syncer update
1485 303103 0 0 3 0x14200 cleaner cleaner
54862 504650 0 0 3 0x14200 reaper reaper
57179 481675 0 0 3 0x14200 pgdaemon pagedaemon
33486 417824 0 0 3 0x14200 bored viomb
83474 446767 0 0 3 0x40014200 acpi0 acpi0
57898 495666 0 0 3 0x40014200 idle1
56159 132700 0 0 2 0x14200 softnet
78181 399224 0 0 3 0x14200 bored systqmp
77151 414230 0 0 3 0x14200 bored systq
29647 197939 0 0 3 0x40014200 bored softclock
82445 508504 0 0 3 0x40014200 idle0
1 165338 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 65708 (syz-executor3957314175) thread 0xffff8000ffff6010 (113695)
shared rwlock vmmaplk r = 0 (0xfffffd800872ea28)
#0 witness_lock+0x44d
#1 uvm_vslock+0xc8 sys/uvm/uvm_glue.c:129
#2 sys_sysctl+0x2d8 sys/kern/kern_sysctl.c:240
#3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#4 Xsyscall+0x128
exclusive rwlock sysctllk r = 0 (0xffffffff82941f10)
#0 witness_lock+0x44d
#1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310
#2 sys_sysctl+0x1b3 sys/kern/kern_sysctl.c:233
#3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#4 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829de988)
#0 witness_lock+0x44d
#1 syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline]
#1 syscall+0x3ef sys/arch/amd64/amd64/trap.c:585
#2 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10143 6388K 6419K 78643K 11233 0
pcb 13 8K 8K 78643K 13 0
rtable 62 2K 2K 78643K 108 0
ifaddr 24 7K 7K 78643K 24 0
counters 40 33K 33K 78643K 40 0
ioctlops 0 0K 2K 78643K 25 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 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 1K 1K 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 74K 75K 78643K 226 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 2K 78643K 391 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 7 26K 26K 78643K 7 0
UVM amap 73 3K 5K 78643K 1951 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 20 4694K 4753K 78643K 3051 0
kqueue 11 16K 18K 78643K 24 0
SYN cache 2 16K 16K 78643K 2 0
ddb{0}> 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 136 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 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 1415 0 38 87 0 87 87 0 8 0
ffsino 272 1415 0 38 92 0 92 92 0 8 0
nchpl 144 1590 0 47 58 0 58 58 0 8 0
uvmvnodes 80 1424 0 0 30 0 30 30 0 8 0
vnodes 224 1424 0 0 84 0 84 84 0 8 0
namei 1024 4131 0 4131 2 1 1 1 0 8 1
percpumem 16 32 0 0 1 0 1 1 0 8 0
scxspl 216 3770 0 3770 2 1 1 2 0 8 1
plimitpl 152 15 0 9 1 0 1 1 0 8 0
sigapl 424 292 0 265 4 0 4 4 0 8 0
knotepl 120 42 0 0 2 0 2 2 0 8 0
kqueuepl 216 20 0 13 1 0 1 1 0 8 0
pipepl 336 79 0 76 2 1 1 1 0 8 0
fdescpl 496 278 0 265 3 0 3 3 0 8 0
filepl 152 1012 0 957 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 17 0 9 1 0 1 1 0 8 0
pgrppl 48 17 0 9 1 0 1 1 0 8 0
ucredpl 96 64 0 54 1 0 1 1 0 8 0
zombiepl 144 265 0 265 2 1 1 1 0 8 1
processpl 1064 292 0 265 3 0 3 3 0 8 0
procpl 672 292 0 265 3 0 3 3 0 8 0
sockpl 480 77 0 53 4 1 3 4 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 64 0 0 8 0 8 8 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 104 0 0 7 0 7 7 0 8 0
bufpl 288 1935 0 86 133 0 133 133 0 8 0
anonpl 24 37988 0 35943 16 2 14 16 0 186 0
amapchunkpl 152 3606 0 3479 7 1 6 7 0 158 0
amappl16 200 27 0 26 2 1 1 1 0 8 0
amappl15 192 59 0 56 1 0 1 1 0 8 0
amappl13 176 32 0 31 2 1 1 1 0 8 0
amappl12 168 15 0 15 2 1 1 1 0 8 1
amappl11 160 46 0 36 1 0 1 1 0 8 0
amappl10 152 5 0 5 1 1 0 1 0 8 0
amappl9 144 447 0 445 1 0 1 1 0 8 0
amappl8 136 339 0 336 1 0 1 1 0 8 0
amappl7 128 60 0 57 1 0 1 1 0 8 0
amappl6 120 107 0 94 1 0 1 1 0 8 0
amappl5 112 163 0 154 1 0 1 1 0 8 0
amappl4 104 578 0 559 1 0 1 1 0 8 0
amappl3 96 113 0 103 1 0 1 1 0 8 0
amappl2 88 336 0 300 1 0 1 1 0 8 0
amappl1 80 8123 0 7772 11 2 9 10 0 8 0
amappl 88 1698 0 1641 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 24 278 0 265 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 278 0 265 1 0 1 1 0 8 0
vmmpekpl 168 5892 0 5877 1 0 1 1 0 8 0
vmmpepl 168 24484 0 23723 46 8 38 45 0 357 1
vmsppl 368 277 0 265 2 0 2 2 0 8 0
rwobjpl 56 8932 0 7000 29 0 29 29 0 8 1
pdppl 4096 563 0 530 52 19 33 45 0 8 0
pvpl 32 123211 0 119421 42 8 34 42 0 265 0
pmappl 248 277 0 265 2 1 1 2 0 8 0
extentpl 40 58 0 38 1 0 1 1 0 8 0
phpool 112 401 0 23 11 0 11 11 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8257690f) at panic+0x177 sys/kern/subr_prf.c:202
witness_checkorder(fffffd800872ea28,9,0) at witness_checkorder+0x11bd witness_debugger sys/kern/subr_witness.c:2505 [inline]
witness_checkorder(fffffd800872ea28,9,0) at witness_checkorder+0x11bd sys/kern/subr_witness.c:772
rw_enter(fffffd800872ea18,21) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250
vm_map_lock_ln(fffffd800872ea10,0,1000) at vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5466
uvm_map_extract(fffffd800872ea10,7f7ffffd1000,1000,ffff8000211c1a30,0) at uvm_map_extract+0x173 sys/uvm/uvm_map.c:4530
uvm_io(fffffd800872ea10,ffff8000211c1ac8,0) at uvm_io+0x127 sys/uvm/uvm_io.c:100
sysctl_proc_args(ffff8000211c1f18,2,20000080,ffff8000211c1f48,ffff8000ffff6010) at sysctl_proc_args+0x24b sys/kern/kern_sysctl.c:1790
kern_sysctl(ffff8000211c1f14,3,20000080,ffff8000211c1f48,0,0,99898603ac1efdc2) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449
sys_sysctl(ffff8000ffff6010,ffff8000211c1fb8,ffff8000211c2010) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249
syscall(ffff8000211c2080) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000211c2080) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffd1140, count: -12
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020ce8ff0) 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
__mp_lock(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147
syscall(ffff800021180860) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline]
syscall(ffff800021180860) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffba050, count: 9
ddb{1}> trace
x86_ipi_db(ffff800020ce8ff0) 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
__mp_lock(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147
syscall(ffff800021180860) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline]
syscall(ffff800021180860) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffba050, count: -6
ddb{1}>