panic: pool_do_get: semupl free list modified: page 0xfffffd806ed2f000; item addr 0xfffffd806ed2fe00; offset 0x10=0xdeaf4153
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*365791 33244 0 0 0 1K syz-executor2005
380075 40611 0 0x12 0 0 sshd
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399
panic() at panic+0x16c sys/kern/subr_prf.c:208
pool_do_get(d10a8966aaa08f6e,2,ffffffff822fbb50) at pool_do_get+0x4bc sys/kern/subr_pool.c:750
pool_get() at pool_get+0x104 sys/kern/subr_pool.c:587
semundo_adjust(720e511c7c24f638,0,ffff800020c04de8,3,ffff800020c04dee) at semundo_adjust+0xee semu_alloc sys/kern/sysv_sem.c:92 [inline]
semundo_adjust(720e511c7c24f638,0,ffff800020c04de8,3,ffff800020c04dee) at semundo_adjust+0xee sys/kern/sysv_sem.c:135
sys_semop(7f95ac01b9b37c20,0,ffff800020be44c0) at sys_semop+0x797 sys/kern/sysv_sem.c:703
syscall(707e873ebaf652ec) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(707e873ebaf652ec) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583
Xsyscall(6,0,22e,0,7f7ffffec6e0,0) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffec720, count: 7
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}> show panic
pool_do_get: semupl free list modified: page 0xfffffd806ed2f000; item addr 0xfffffd806ed2fe00; offset 0x10=0xdeaf4153
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399
panic() at panic+0x16c sys/kern/subr_prf.c:208
pool_do_get(d10a8966aaa08f6e,2,ffffffff822fbb50) at pool_do_get+0x4bc sys/kern/subr_pool.c:750
pool_get() at pool_get+0x104 sys/kern/subr_pool.c:587
semundo_adjust(720e511c7c24f638,0,ffff800020c04de8,3,ffff800020c04dee) at semundo_adjust+0xee semu_alloc sys/kern/sysv_sem.c:92 [inline]
semundo_adjust(720e511c7c24f638,0,ffff800020c04de8,3,ffff800020c04dee) at semundo_adjust+0xee sys/kern/sysv_sem.c:135
sys_semop(7f95ac01b9b37c20,0,ffff800020be44c0) at sys_semop+0x797 sys/kern/sysv_sem.c:703
syscall(707e873ebaf652ec) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(707e873ebaf652ec) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583
Xsyscall(6,0,22e,0,7f7ffffec6e0,0) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffec720, count: -8
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800020c04b30
rbx 0xffff800020c04bd0
rdx 0xffffffff81f31b5c cy_pio_rec+0x15d8
rcx 0x201
rax 0x1
r8 0xffffffff81b488b4 kprintf+0x174
r9 0x1
r10 0x5961057003919bfe
r11 0x91e5fe029ab1389e
r12 0x3000000008
r13 0xffff800020c04b40
r14 0x100
r15 0x1
rip 0xffffffff8135b538 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020c04b20
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor2005) pid=365791 stat=onproc
flags process=0 proc=0
pri=51, usrpri=51, nice=20
forw=0xffffffffffffffff, list=0xffff800020be5078,0xffffffff822fd4d8
process=0xffff800020bca6a8 user=0xffff800020c00000, vmspace=0xfffffd806e923440
estcpu=1, cpticks=2, pctcpu=0.0
user=0, sys=2, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*33244 365791 41592 0 7 0 syz-executor2005
41592 227912 78535 0 3 0x82 nanosleep syz-executor2005
78535 115543 40611 0 3 0x10008a pause ksh
40611 380075 67739 0 7 0x12 sshd
10001 146679 1 0 3 0x100083 ttyin getty
67739 246502 1 0 3 0x80 select sshd
99007 2662 2240 73 3 0x100090 kqread syslogd
2240 114204 1 0 3 0x100082 netio syslogd
97780 480017 1 77 3 0x100090 poll dhclient
40439 437524 1 0 3 0x80 poll dhclient
55893 238785 0 0 3 0x14200 pgzero zerothread
78618 451373 0 0 3 0x14200 aiodoned aiodoned
81369 219966 0 0 3 0x14200 syncer update
3827 239647 0 0 3 0x14200 cleaner cleaner
7087 401020 0 0 3 0x14200 reaper reaper
76019 382624 0 0 3 0x14200 pgdaemon pagedaemon
58593 162403 0 0 3 0x14200 bored crynlk
84496 362342 0 0 3 0x14200 bored crypto
96415 49265 0 0 3 0x40014200 acpi0 acpi0
26680 272494 0 0 3 0x40014200 idle1
70891 456264 0 0 3 0x14200 bored softnet
13996 447313 0 0 3 0x14200 bored systqmp
84368 491029 0 0 3 0x14200 bored systq
90467 407245 0 0 3 0x40014200 bored softclock
32237 243883 0 0 3 0x40014200 idle0
1 365921 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex semupl r = 0 (0xffffffff822fbb60) locked @ /syzkaller/managers/multicore/kernel/sys/kern/subr_pool.c:583
Process 33244 (syz-executor2005) thread 0xffff800020be44c0 (365791)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff822d88a8) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90
exclusive mutex semupl r = 0 (0xffffffff822fbb60) locked @ /syzkaller/managers/multicore/kernel/sys/kern/subr_pool.c:583
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9442 6315K 6316K 78643K 10529 0 0
pcb 23 9K 9K 78643K 55 0 0
rtable 61 2K 2K 78643K 115 0 0
ifaddr 21 7K 7K 78643K 21 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 2K 78643K 13 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1166 73K 73K 78643K 1171 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 1K 78643K 2 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 4 0K 0K 78643K 4 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1792 194K 288K 78643K 12592 0 0
file desc 1 0K 0K 78643K 1 0 0
proc 40 38K 46K 78643K 201 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
in_multi 11 0K 0K 78643K 11 0 0
ether_multi 1 0K 0K 78643K 1 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 18 79K 79K 78643K 18 0 0
exec 0 0K 1K 78643K 149 0 0
pagedep 1 8K 8K 78643K 1 0 0
inodedep 1 32K 32K 78643K 1 0 0
newblk 1 0K 0K 78643K 1 0 0
VM swap 7 26K 26K 78643K 7 0 0
UVM amap 47 2K 3K 78643K 663 0 0
UVM aobj 2 2K 2K 78643K 2 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
NDP 3 0K 0K 78643K 3 0 0
temp 30 2347K 2411K 78643K 1690 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp 64 2 0 0 1 0 1 1 0 8 0
inpcbpl 280 22 0 16 1 0 1 1 0 8 0
plimitpl 152 13 0 8 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
syncache 264 5 0 5 1 0 1 1 0 8 1
tcpcb 544 8 0 5 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
semupl 112 1 0 1 1 0 1 1 0 8 1
pool(0xffffffff822fbb50:semupl): page inconsistency: page 0xfffffd806ed2f000; 34 on list, 0 missing, 35 items per page
semapl 112 2 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 1381 0 16 45 0 45 45 0 8 0
ffsino 272 1381 0 16 91 0 91 91 0 8 0
nchpl 144 1553 0 30 57 0 57 57 0 8 0
uvmvnodes 72 1390 0 0 26 0 26 26 0 8 0
vnodes 200 1390 0 0 74 0 74 74 0 8 0
namei 1024 3255 0 3255 2 1 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
scxspl 192 2350 0 2350 9 2 7 7 0 8 7
sigapl 432 175 0 164 2 0 2 2 0 8 0
knotepl 112 5 0 0 1 0 1 1 0 8 0
kqueuepl 104 1 0 0 1 0 1 1 0 8 0
pipepl 112 114 0 107 2 1 1 1 0 8 0
fdescpl 488 176 0 164 2 0 2 2 0 8 0
filepl 152 807 0 765 2 0 2 2 0 8 0
lockfpl 104 6 0 6 1 1 0 1 0 8 0
lockfspl 32 3 0 3 1 1 0 1 0 8 0
sessionpl 112 17 0 9 1 0 1 1 0 8 0
pgrppl 48 17 0 9 1 0 1 1 0 8 0
ucredpl 96 47 0 40 1 0 1 1 0 8 0
zombiepl 144 164 0 164 2 1 1 1 0 8 1
processpl 840 190 0 164 4 0 4 4 0 8 0
procpl 600 190 0 164 3 0 3 3 0 8 0
sockpl 384 64 0 48 2 0 2 2 0 8 0
mcl4k 4096 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 56 0 0 7 0 7 7 0 8 0
mtagpl 80 1 0 0 1 0 1 1 0 8 0
mbufpl 256 74 0 0 5 0 5 5 0 8 0
bufpl 256 2001 0 261 109 0 109 109 0 8 0
anonpl 16 17042 0 15940 8 2 6 7 0 125 1
amapchunkpl 152 523 0 487 2 0 2 2 0 158 0
amappl16 192 69 0 64 1 0 1 1 0 8 0
amappl15 184 1 0 1 1 1 0 1 0 8 0
amappl14 176 1 0 1 1 1 0 1 0 8 0
amappl13 168 16 0 13 1 0 1 1 0 8 0
amappl12 160 6 0 6 1 0 1 1 0 8 1
amappl11 152 172 0 163 1 0 1 1 0 8 0
amappl10 144 42 0 42 2 1 1 1 0 8 1
amappl9 136 201 0 200 1 0 1 1 0 8 0
amappl8 128 100 0 94 1 0 1 1 0 8 0
amappl7 120 30 0 26 1 0 1 1 0 8 0
amappl6 112 39 0 34 1 0 1 1 0 8 0
amappl5 104 143 0 131 1 0 1 1 0 8 0
amappl4 96 256 0 237 1 0 1 1 0 8 0
amappl3 88 112 0 107 1 0 1 1 0 8 0
amappl2 80 552 0 517 1 0 1 1 0 8 0
amappl1 72 11453 0 11062 16 6 10 16 0 8 0
amappl 72 379 0 359 1 0 1 1 0 75 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma64 64 259 0 259 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 17 0 17 1 1 0 1 0 8 0
aobjpl 64 1 0 0 1 0 1 1 0 8 0
uaddrrnd 24 176 0 164 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 176 0 164 1 0 1 1 0 8 0
vmmpekpl 168 5120 0 5100 1 0 1 1 0 8 0
vmmpepl 168 23323 0 22619 53 19 34 47 0 357 3
vmsppl 360 175 0 164 2 0 2 2 0 8 0
pdppl 4096 359 0 328 5 0 5 5 0 8 0
pvpl 32 69966 0 67215 30 4 26 26 0 265 3
pmappl 224 175 0 164 1 0 1 1 0 8 0
extentpl 40 39 0 25 1 0 1 1 0 8 0
phpool 112 233 0 3 7 0 7 7 0 8 0
ddb{1}>