panic: pool_do_get: semapl free list modified: page 0xfffffd806c3f4000; item addr 0xfffffd806c3f4e70; offset 0x10=0xdeadbe00
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
60769 38124 0 0 0 1 syz-executor.0
*360156 38124 0 0 0x4000000 0 syz-executor.0
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82603660) at panic+0x177 sys/kern/subr_prf.c:202
pool_do_get(ffffffff82baa760,9,ffff800021334d98) at pool_do_get+0x474 sys/kern/subr_pool.c:741
pool_get(ffffffff82baa760,9) at pool_get+0xe9 sys/kern/subr_pool.c:584
sys_semget(ffff8000ffff5ce8,ffff800021334e98,ffff800021334ee0) at sys_semget+0x259 sys/kern/sysv_sem.c:428
syscall(ffff800021334f60) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff800021334f60) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x28ad111e4a0, count: 8
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: pool_do_get: semapl free list modified: page 0xfffffd806c3f4000; item addr 0xfffffd806c3f4e70; offset 0x10=0xdeadbe00
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82603660) at panic+0x177 sys/kern/subr_prf.c:202
pool_do_get(ffffffff82baa760,9,ffff800021334d98) at pool_do_get+0x474 sys/kern/subr_pool.c:741
pool_get(ffffffff82baa760,9) at pool_get+0xe9 sys/kern/subr_pool.c:584
sys_semget(ffff8000ffff5ce8,ffff800021334e98,ffff800021334ee0) at sys_semget+0x259 sys/kern/sysv_sem.c:428
syscall(ffff800021334f60) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff800021334f60) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x28ad111e4a0, count: -7
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff800021334be0
rbx 0xffffffff8293fb97 cpu_info_full_primary+0x2b97
rdx 0x3fd
rcx 0
rax 0x7d
r8 0x101010101010101
r9 0x8080808080808080
r10 0x9313154e0515d846
r11 0x703c185d3716c8a6
r12 0xffffffff8293f998 cpu_info_full_primary+0x2998
r13 0
r14 0
r15 0x1
rip 0xffffffff813ddc48 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800021334bd0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.0) pid=360156 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=51, usrpri=51, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffff5268,0xffffffff82a89e48
process=0xffff8000ffff94d0 user=0xffff800021330000, vmspace=0xfffffd807effdb80
estcpu=2, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
38124 60769 56728 0 7 0 syz-executor.0
38124 52688 56728 0 3 0x4000080 fsleep syz-executor.0
38124 115793 56728 0 3 0x4000080 fsleep syz-executor.0
*38124 360156 56728 0 7 0x4000000 syz-executor.0
56728 185281 29331 0 2 0x482 syz-executor.0
29331 511711 64442 0 3 0x82 thrsleep syz-execprog
29331 82263 64442 0 2 0x4000482 syz-execprog
29331 168220 64442 0 3 0x4000082 wait syz-execprog
29331 337049 64442 0 3 0x4000082 thrsleep syz-execprog
29331 474002 64442 0 3 0x4000082 thrsleep syz-execprog
29331 457356 64442 0 3 0x4000082 kqread syz-execprog
29331 57617 64442 0 3 0x4000082 thrsleep syz-execprog
29331 505831 64442 0 3 0x4000082 thrsleep syz-execprog
64442 500785 77941 0 3 0x10008a sigsusp ksh
77941 313837 80763 0 3 0x9a kqread sshd
4420 134126 1 0 3 0x100083 ttyin getty
80763 487793 1 0 3 0x88 kqread sshd
14836 482752 42051 74 3 0x1100092 bpf pflogd
42051 232377 1 0 3 0x80 netio pflogd
75953 449363 28263 73 3 0x1100090 kqread syslogd
28263 498598 1 0 3 0x100082 netio syslogd
21329 188372 1 0 3 0x100080 kqread resolvd
62290 291731 39804 77 3 0x100092 kqread dhcpleased
93502 490010 39804 77 3 0x100092 kqread dhcpleased
39804 315732 1 0 3 0x80 kqread dhcpleased
63938 252119 0 0 3 0x14200 bored smr
3084 343655 0 0 2 0x14200 zerothread
27463 291160 0 0 3 0x14200 aiodoned aiodoned
64156 168982 0 0 3 0x14200 syncer update
64821 390795 0 0 3 0x14200 cleaner cleaner
28259 257467 0 0 3 0x14200 reaper reaper
21534 43684 0 0 3 0x14200 pgdaemon pagedaemon
61744 101659 0 0 3 0x14200 bored viomb
76738 375638 0 0 3 0x40014200 acpi0 acpi0
31066 413910 0 0 3 0x40014200 idle1
79734 193750 0 0 3 0x14200 bored softnet
67802 221673 0 0 3 0x14200 bored softnet
44810 138756 0 0 3 0x14200 bored softnet
56165 323651 0 0 3 0x14200 bored softnet
41406 51730 0 0 3 0x14200 bored systqmp
2327 177872 0 0 3 0x14200 bored systq
27186 36803 0 0 2 0x40014200 softclock
58881 499516 0 0 3 0x40014200 idle0
1 33260 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex semapl r = 0 (0xffffffff82baa770)
#0 witness_lock+0x44d
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pool_get+0xbd sys/kern/subr_pool.c:581
#4 sys_semget+0x259 sys/kern/sysv_sem.c:428
#5 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline]
#5 syscall+0x435 sys/arch/amd64/amd64/trap.c:585
#6 Xsyscall+0x128
Process 38124 (syz-executor.0) thread 0xffff8000ffff5ce8 (360156)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82ab97c8)
#0 witness_lock+0x44d
#1 syscall+0x41d mi_syscall sys/sys/syscall_mi.h:100 [inline]
#1 syscall+0x41d sys/arch/amd64/amd64/trap.c:585
#2 Xsyscall+0x128
exclusive mutex semapl r = 0 (0xffffffff82baa770)
#0 witness_lock+0x44d
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pool_get+0xbd sys/kern/subr_pool.c:581
#4 sys_semget+0x259 sys/kern/sysv_sem.c:428
#5 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline]
#5 syscall+0x435 sys/arch/amd64/amd64/trap.c:585
#6 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10158 6457K 6457K 78643K 11248 0
pcb 13 8K 8K 78643K 13 0
rtable 80 2K 2K 78643K 145 0
ifaddr 38 9K 9K 78643K 41 0
counters 42 33K 33K 78643K 42 0
ioctlops 0 0K 4K 78643K 1480 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1167 73K 73K 78643K 1180 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 9 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 4 9K 13K 78643K 24 0
proc 67 91K 103K 78643K 310 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 22 1K 1K 78643K 22 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 500 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 8 62K 62K 78643K 8 0
UVM amap 101 13K 13K 78643K 1819 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 7 0K 0K 78643K 7 0
temp 28 4709K 4773K 78643K 2899 0
kqueue 12 18K 18K 78643K 25 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 23 0 20 1 0 1 1 0 8 0
rtentry 112 34 0 1 1 0 1 1 0 8 0
unpcb 144 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 4 0 0 1 0 1 1 0 8 0
inpcb 320 36 0 30 1 0 1 1 0 8 0
nd6 48 3 0 0 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 11 0 2 1 0 1 1 0 8 0
pfstkey 120 11 0 2 1 0 1 1 0 8 0
pfstate 336 11 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 256 145 0 0 10 0 10 10 0 8 0
art_table 32 146 0 0 2 0 2 2 0 8 0
art_node 16 33 0 3 1 0 1 1 0 8 0
semapl 112 7 0 7 1 0 1 1 0 8 1
semapl: pool(0xffffffff82baa760:semapl): page inconsistency: page 0xfffffd806c3f4000; item ordinal 0; addr 0xb1ab9ce6bb5e841f
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1453 0 51 88 0 88 88 0 8 0
ffsino 272 1453 0 51 94 0 94 94 0 8 0
nchpl 144 1695 0 63 61 0 61 61 0 8 0
uvmvnodes 80 1463 0 0 30 0 30 30 0 8 0
vnodes 216 1463 0 0 82 0 82 82 0 8 0
namei 1024 5175 0 5175 3 1 2 2 0 8 2
percpumem 16 33 0 0 1 0 1 1 0 8 0
kstatmem 264 10 0 0 1 0 1 1 0 8 0
scxspl 216 5371 0 5371 10 2 8 8 0 8 8
plimitpl 152 17 0 9 1 0 1 1 0 8 0
sigapl 424 363 0 329 6 1 5 5 0 8 1
futexpl 64 21 0 19 1 0 1 1 0 8 0
knotepl 120 70 0 0 3 0 3 3 0 8 0
kqueuepl 216 21 0 13 1 0 1 1 0 8 0
pipepl 320 110 0 103 2 1 1 1 0 8 0
fdescpl 496 346 0 329 4 0 4 4 0 8 1
filepl 152 1412 0 1342 4 0 4 4 0 8 1
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 19 0 9 1 0 1 1 0 8 0
pgrppl 48 19 0 9 1 0 1 1 0 8 0
ucredpl 104 69 0 57 1 0 1 1 0 8 0
zombiepl 144 329 0 329 2 1 1 1 0 8 1
processpl 1064 363 0 329 3 0 3 3 0 8 0
procpl 672 379 0 335 6 1 5 5 0 8 1
sockpl 488 94 0 70 5 1 4 4 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 4 0 0 1 0 1 1 0 8 0
mcl2k 2048 66 0 0 9 0 9 9 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 131 0 0 8 0 8 8 0 8 0
bufpl 288 3522 0 136 242 0 242 242 0 8 0
anonpl 24 45239 0 41886 44 4 40 40 0 186 18
amapchunkpl 152 3550 0 3295 17 2 15 15 0 158 5
amappl16 200 127 0 72 5 1 4 4 0 8 0
amappl15 192 90 0 83 1 0 1 1 0 8 0
amappl14 184 23 0 17 1 0 1 1 0 8 0
amappl13 176 40 0 39 2 1 1 1 0 8 0
amappl12 168 2 0 2 1 1 0 1 0 8 0
amappl11 160 81 0 63 1 0 1 1 0 8 0
amappl10 152 20 0 17 1 0 1 1 0 8 0
amappl9 144 451 0 448 1 0 1 1 0 8 0
amappl8 136 433 0 419 2 1 1 1 0 8 0
amappl7 128 98 0 85 1 0 1 1 0 8 0
amappl6 120 143 0 134 2 0 2 2 0 8 1
amappl5 112 98 0 86 1 0 1 1 0 8 0
amappl4 104 727 0 699 2 0 2 2 0 8 1
amappl3 96 513 0 480 2 0 2 2 0 8 1
amappl2 88 408 0 374 2 0 2 2 0 8 0
amappl1 80 10960 0 10474 22 2 20 20 0 8 10
amappl 88 1471 0 1403 4 1 3 3 0 92 1
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 24 346 0 329 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 346 0 329 1 0 1 1 0 8 0
vmmpekpl 168 8156 0 8133 2 0 2 2 0 8 0
vmmpepl 168 33216 0 32022 97 5 92 92 0 357 40
vmsppl 368 345 0 329 3 0 3 3 0 8 1
rwobjpl 56 11362 0 9144 42 1 41 41 0 8 6
pdppl 4096 699 0 658 85 36 49 57 0 8 8
pvpl 32 206700 0 200284 247 6 241 241 0 265 188
pmappl 248 345 0 329 2 0 2 2 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 555 0 40 15 0 15 15 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:437
panic(ffffffff82603660) at panic+0x177 sys/kern/subr_prf.c:202
pool_do_get(ffffffff82baa760,9,ffff800021334d98) at pool_do_get+0x474 sys/kern/subr_pool.c:741
pool_get(ffffffff82baa760,9) at pool_get+0xe9 sys/kern/subr_pool.c:584
sys_semget(ffff8000ffff5ce8,ffff800021334e98,ffff800021334ee0) at sys_semget+0x259 sys/kern/sysv_sem.c:428
syscall(ffff800021334f60) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff800021334f60) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x28ad111e4a0, count: -7
ddb{0}> machine ddbcpu 1