uvm_fault: pool_gc_pages (3)
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syzbot
Jan 31, 2026, 8:26:42 AM (3 days ago) Jan 31
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 3729e22e7105 sync
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1594053a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=fc140c71faad46b3b3b7
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/39e6d9ba420a/disk-3729e22e.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/97911d116426/bsd-3729e22e.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/25607c7d53e2/kernel-3729e22e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fc140c...@syzkaller.appspotmail.com
uvm_fault(0xffffffff83a1c0d0, 0x0, 0, 2) -> e
kernel: page fault trap, code=2
Stopped at pool_gc_pages+0x2bf: movq %rax,0(%rcx)
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*309001 85968 0 0x14000 0x200 0 systqmp
pool_gc_pages(0) at pool_gc_pages+0x2bf pool_p_remove sys/kern/subr_pool.c:1055 [inline]
pool_gc_pages(0) at pool_gc_pages+0x2bf sys/kern/subr_pool.c:1584
taskq_thread(ffffffff8383f870) at taskq_thread+0x157 sys/kern/kern_task.c:446
end trace frame: 0x0, count: 13
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: uvm_fault(0xffffffff83a1c0d0, 0x0, 0, 2) -> e
ddb{0}> trace
pool_gc_pages(0) at pool_gc_pages+0x2bf pool_p_remove sys/kern/subr_pool.c:1055 [inline]
pool_gc_pages(0) at pool_gc_pages+0x2bf sys/kern/subr_pool.c:1584
taskq_thread(ffffffff8383f870) at taskq_thread+0x157 sys/kern/kern_task.c:446
end trace frame: 0x0, count: -2
ddb{0}> show registers
rdi 0
rsi 0xffffffff8393a1c0 inpcb_pool+0x68
rbp 0xffff80002a20a090
rbx 0xfffffd806c728f90
rdx 0xffffffff8393a1c0 inpcb_pool+0x68
rcx 0
rax 0
r8 0xffffffffffffffff
r9 0
r10 0x8ef37d0e1b3bac00
r11 0x6d73c49e90f393e
r12 0x1dcd65000
r13 0xffffffff8393a160 inpcb_pool+0x8
r14 0xf90
r15 0xffffffff8393a158 inpcb_pool
rip 0xffffffff823101bf pool_gc_pages+0x2bf
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80002a20a050
ss 0x10
pool_gc_pages+0x2bf: movq %rax,0(%rcx)
ddb{0}> show proc
PROC (systqmp) tid=309001 pid=85968 tcnt=1 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
runpri=50, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000ffffe298,0xffff8000ffffea70
process=0xffff8000ffff9810 user=0xffff80002a205000, vmspace=0xffffffff83a1c0d0
estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
8071 233398 46342 0 2 0 syz-executor
8071 306592 46342 0 2 0x4000000 syz-executor
50300 386002 82191 0 2 0 syz-executor
50300 299128 82191 0 3 0x4000080 fsleep syz-executor
22507 245503 73945 0 2 0xc80 syz-executor
22507 471741 73945 0 3 0x4000080 netacc syz-executor
22507 163384 73945 0 3 0x4000080 fsleep syz-executor
17492 98278 25247 0 2 0xc80 syz-executor
17492 240963 25247 0 3 0x4000080 lockf syz-executor
17492 388608 25247 0 3 0x4000080 fsleep syz-executor
44525 321869 1 0 3 0x100083 ttyin getty
35546 116114 10637 0 3 0x82 wait syz-executor
27004 489234 0 0 3 0x14280 nfsidl nfsio
88156 39648 0 0 3 0x14280 nfsidl nfsio
77612 230202 0 0 3 0x14280 nfsidl nfsio
29814 198271 0 0 3 0x14280 nfsidl nfsio
22678 413950 0 0 3 0x14280 nfsidl nfsio
8096 423984 0 0 3 0x14280 nfsidl nfsio
74643 505036 0 0 3 0x14280 nfsidl nfsio
50677 57282 0 0 3 0x14280 nfsidl nfsio
59125 407559 0 0 3 0x14280 nfsidl nfsio
72908 360506 0 0 3 0x14280 nfsidl nfsio
43767 332087 0 0 3 0x14280 nfsidl nfsio
42570 334975 0 0 3 0x14280 nfsidl nfsio
28797 111968 0 0 3 0x14280 nfsidl nfsio
33872 65252 0 0 3 0x14280 nfsidl nfsio
5504 17834 0 0 3 0x14280 nfsidl nfsio
83666 382708 0 0 3 0x14280 nfsidl nfsio
42941 95656 0 0 3 0x14280 nfsidl nfsio
80443 325192 0 0 3 0x14280 nfsidl nfsio
40032 451986 0 0 3 0x14280 nfsidl nfsio
46958 165272 0 0 3 0x14280 nfsidl nfsio
74906 224579 10637 0 2 0xc82 syz-executor
15798 295690 10637 0 2 0x2 syz-executor
73945 476673 10637 0 2 0xc82 syz-executor
46342 10236 10637 0 2 0xc82 syz-executor
82191 370390 10637 0 2 0xc82 syz-executor
25247 102518 10637 0 2 0xc82 syz-executor
46748 266665 10637 0 3 0x82 piperd syz-executor
10637 425761 2894 0 2 0x2 syz-executor
2894 433452 61755 0 3 0x10008a sigsusp ksh
61755 503902 50334 0 3 0x98 kqread sshd-session
50334 19397 54932 0 3 0x92 kqread sshd-session
54932 154560 1 0 3 0x88 kqread sshd
87137 428322 20295 74 2 0x1100012 pflogd
20295 16326 1 0 3 0x80 sbwait pflogd
24365 193937 20722 73 3 0x1100090 kqread syslogd
20722 377142 1 0 3 0x100082 sbwait syslogd
78332 494209 1 0 3 0x100080 kqread resolvd
41404 323727 92596 77 3 0x100092 kqread dhcpleased
67055 106749 92596 77 3 0x100092 kqread dhcpleased
92596 487043 1 0 3 0x80 kqread dhcpleased
5169 272177 0 0 3 0x14200 bored smr
94931 139611 0 0 2 0x14200 zerothread
98218 462500 0 0 3 0x14200 aiodoned aiodoned
87878 135215 0 0 3 0x14200 syncer update
92659 113015 0 0 3 0x14200 cleaner cleaner
46699 290049 0 0 3 0x14200 reaper reaper
20210 523264 0 0 3 0x14200 pgdaemon pagedaemon
36701 462078 0 0 3 0x14200 bored viomb
61493 393433 0 0 3 0x40014200 acpi0 acpi0
64435 210967 0 0 7 0x40014200 idle1
78015 106729 0 0 3 0x14200 bored softnet1
33047 297431 0 0 3 0x14200 bored softnet0
*85968 309001 0 0 7 0x14200 systqmp
25984 367270 0 0 3 0x14200 bored systq
36885 328670 0 0 2 0x14200 softclockmp
64340 93428 0 0 2 0x40014200 softclock
71009 33304 0 0 3 0x40014200 idle0
1 109622 0 0 3 0x82 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex inpcb r = 0 (0xffffffff8393a170)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter_try+0x1aa sys/kern/kern_lock.c:-1
#2 pool_gc_pages+0xf4 pl_enter_try sys/kern/subr_pool.c:109 [inline]
#2 pool_gc_pages+0xf4 sys/kern/subr_pool.c:1576
#3 taskq_thread+0x157 sys/kern/kern_task.c:446
#4 proc_trampoline+0x10
Process 85968 (systqmp) thread 0xffff8000ffffe530 (309001)
shared rwlock pools r = 0 (0xffffffff8383e7b8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 pool_gc_pages+0x2e sys/kern/subr_pool.c:1568
#3 taskq_thread+0x157 sys/kern/kern_task.c:446
#4 proc_trampoline+0x10
shared rwlock systqmp r = 0 (0xffffffff8383f8e8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
exclusive mutex inpcb r = 0 (0xffffffff8393a170)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter_try+0x1aa sys/kern/kern_lock.c:-1
#2 pool_gc_pages+0xf4 pl_enter_try sys/kern/subr_pool.c:109 [inline]
#2 pool_gc_pages+0xf4 sys/kern/subr_pool.c:1576
#3 taskq_thread+0x157 sys/kern/kern_task.c:446
#4 proc_trampoline+0x10
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11066 12085K 12343K 166960K 13338 0
pcb 20 16K 21K 166960K 637 0
rtable 178 10K 12K 166960K 771 0
pf 33 17K 81K 166960K 224 0
ifaddr 32 5K 8K 166960K 165 0
ifgroup 51 2K 2K 166960K 275 0
sysctl 4 1K 9K 166960K 14 0
counters 68 36K 38K 166960K 316 0
ioctlops 0 0K 4K 166960K 2021 0
iov 0 0K 24K 166960K 122 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1325 83K 85K 166960K 2369 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 2K 5K 166960K 10 0
VM map 2 1K 1K 166960K 2 0
sem 15 0K 0K 166960K 73 0
dirhash 12 2K 2K 166960K 48 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 16 57K 236K 166960K 1843 0
sigio 0 0K 0K 166960K 60 0
proc 72 115K 164K 166960K 805 0
subproc 72 4K 4K 166960K 108 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 201 0
in_multi 56 4K 8K 166960K 234 0
ether_multi 1 0K 0K 166960K 13 0
mrt 0 0K 0K 166960K 14 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 91 413K 413K 166960K 91 0
exec 0 0K 1K 166960K 984 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 2 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 239 172K 181K 166960K 18014 0
UVM aobj 44 10K 10K 166960K 51 0
pinsyscall 41 82K 108K 166960K 3160 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 1 0K 0K 166960K 115 0
NDP 12 0K 1K 166960K 117 0
temp 78 8688K 8763K 166960K 90784 0
kqueue 15 24K 32K 166960K 341 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 26 0 0 1 0 1 1 0 8 0
rtpcb 120 242 0 239 2 1 1 2 0 8 0
rtentry 176 212 0 150 6 1 5 6 0 8 0
unpcb 144 1387 0 1369 9 5 4 6 0 8 3
syncache 336 13 0 13 3 2 1 1 0 8 1
tcpqe 32 6 0 6 2 1 1 1 0 8 1
tcpcb 736 435 0 422 2 0 2 2 0 8 0
arp 136 30 0 19 1 0 1 1 0 8 0
inpcb 328 1840 0 1821 14 10 4 9 0 8 2
inpcb: pool(0xffffffff8393a158:inpcb): page inconsistency: page 0x0; at page head addr 0xfffffd806c728f90 (p 0xfffffd806c728000)
nd6 152 52 0 36 2 0 2 2 0 8 0
pkpcb 40 16 0 16 2 2 0 1 0 8 0
kcovpl 48 12 0 4 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 1 0 1 0 8 0
ppxss 1192 100 0 99 1 0 1 1 0 8 0
pppxif 1504 13 0 13 3 3 0 1 0 8 0
pffrag 232 18 0 4 1 0 1 1 0 482 0
pffrnode 88 16 0 3 1 0 1 1 0 8 0
pffrent 40 26 0 12 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 1 0 1 1 1 0 1 0 8 0
pfstitem 24 2 0 0 1 0 1 1 0 8 0
pfstkey 128 2 0 0 1 0 1 1 0 8 0
pfstate 448 1 0 0 1 0 1 1 0 8 0
rttmr 136 3 0 3 2 2 0 1 0 8 0
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 986 0 710 30 6 24 30 0 8 4
art_table 40 988 0 710 5 0 5 5 0 8 0
art_node 32 211 0 155 1 0 1 1 0 8 0
sysvmsgpl 40 72 0 69 1 0 1 1 0 8 0
semapl 112 66 0 53 1 0 1 1 0 8 0
shmpl 112 42 0 4 2 0 2 2 0 8 0
dirhash 1024 41 0 24 3 0 3 3 0 8 0
dino2pl 256 4741 0 3235 96 0 96 96 0 8 0
ffsino 296 4741 0 3235 117 0 117 117 0 8 0
nchpl 144 7162 0 5444 64 0 64 64 0 8 0
rtmask 32 15 0 15 4 3 1 1 0 8 1
vnodes 216 5168 0 0 288 0 288 288 0 8 0
namei 1024 24433 0 24433 2 1 1 2 0 8 1
percpumem 16 173 0 124 1 0 1 1 0 8 0
vcpupl 3968 4 0 1 1 0 1 1 0 8 0
vmpool 848 6 0 3 1 0 1 1 0 8 0
kstatmem 264 186 0 160 3 0 3 3 0 8 1
scsiplug 72 7 0 7 3 2 1 1 0 8 1
scxspl 216 47614 0 47613 12 10 2 8 1 8 1
plimitpl 152 604 0 587 1 0 1 1 0 8 0
sigapl 424 2199 0 2133 10 2 8 8 0 8 0
knotepl 120 563 0 0 17 0 17 17 0 8 0
kqueuepl 224 740 0 728 9 7 2 9 0 8 1
pipepl 344 297 0 270 6 3 3 6 0 8 0
fdescpl 528 2139 0 2109 3 0 3 3 0 8 0
filepl 160 12685 0 12460 19 6 13 16 0 8 0
lockfpl 104 542 0 538 1 0 1 1 0 8 0
lockfspl 48 188 0 185 1 0 1 1 0 8 0
sessionpl 144 39 0 30 1 0 1 1 0 8 0
pgrppl 48 73 0 56 1 0 1 1 0 8 0
ucredpl 104 1947 0 1933 1 0 1 1 0 8 0
zombiepl 144 2135 0 2133 1 0 1 1 0 8 0
processpl 1232 2199 0 2133 6 0 6 6 0 8 0
procpl 664 4923 0 4851 9 1 8 8 0 8 0
sosppl 176 4 0 4 2 2 0 1 0 8 0
sockpl 752 3541 0 3500 26 14 12 17 0 8 6
mcl64k 65536 6 0 0 1 0 1 1 0 8 0
mcl16k 16384 4 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 10 0 0 2 0 2 2 0 8 0
mcl4k 4096 118 0 0 15 0 15 15 0 8 0
mcl2k2 2112 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 33 0 0 4 0 4 4 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 1254 0 0 79 0 79 79 0 8 0
bufpl 280 18901 0 12765 439 0 439 439 0 8 0
anonpl 32 17903 0 0 145 0 145 145 0 246 0
amapchunkpl 152 61152 0 60681 37 5 32 32 0 158 9
amappl16 200 7835 0 7802 72 58 14 47 0 8 8
amappl15 192 3 0 3 1 1 0 1 0 8 0
amappl14 184 11 0 11 1 1 0 1 0 8 0
amappl13 176 484 0 483 1 0 1 1 0 8 0
amappl12 168 2599 0 2558 3 0 3 3 0 8 0
amappl11 160 8 0 8 2 2 0 1 0 8 0
amappl10 152 58 0 43 1 0 1 1 0 8 0
amappl9 144 247 0 247 1 1 0 1 0 8 0
amappl8 136 30 0 27 1 0 1 1 0 8 0
amappl7 128 113 0 111 1 0 1 1 0 8 0
amappl6 120 348 0 334 1 0 1 1 0 8 0
amappl5 112 86 0 76 1 0 1 1 0 8 0
amappl4 104 513 0 484 1 0 1 1 0 8 0
amappl3 96 10952 0 10861 4 1 3 3 0 8 0
amappl2 88 2342 0 2263 2 0 2 2 0 8 0
amappl1 80 19458 0 18876 15 1 14 15 0 8 0
amappl 88 16892 0 16733 6 1 5 5 0 92 0
uvmvnodes 80 157 0 0 4 0 4 4 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma2048 2048 2 0 2 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 128 254 0 254 2 2 0 1 0 8 0
dma64 64 7 0 7 2 2 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 50 0 7 1 0 1 1 0 8 0
uaddrrnd 24 2139 0 2109 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 2139 0 2109 1 0 1 1 0 8 0
vmmpekpl 168 17892 0 17833 4 0 4 4 0 8 0
vmmpepl 168 143689 0 141817 124 26 98 124 0 357 5
vmsppl 488 2138 0 2109 6 1 5 5 0 8 0
rwobjpl 80 39921 0 38794 43 13 30 41 0 8 0
pdppl 4096 4297 0 4227 109 35 74 85 0 8 4
pvpl 32 24141 0 0 196 1 195 195 0 265 0
pmappl 256 2144 0 2112 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 358 0 48 10 0 10 10 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
pool_gc_pages(0) at pool_gc_pages+0x2bf pool_p_remove sys/kern/subr_pool.c:1055 [inline]
pool_gc_pages(0) at pool_gc_pages+0x2bf sys/kern/subr_pool.c:1584
taskq_thread(ffffffff8383f870) at taskq_thread+0x157 sys/kern/kern_task.c:446
end trace frame: 0x0, count: -2
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff8000299ddff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224
sched_idle(ffff8000299ddff0) at sched_idle+0x391 sys/kern/kern_sched.c:191
end trace frame: 0x0, count: 10
ddb{1}> trace
x86_ipi_db(ffff8000299ddff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224
sched_idle(ffff8000299ddff0) at sched_idle+0x391 sys/kern/kern_sched.c:191
end trace frame: 0x0, count: -5
---
This report is generated by a bot. It may contain errors.
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If you want to overwrite report's subsystems, reply with:
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#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 3729e22e7105 sync
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1594053a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=fc140c71faad46b3b3b7
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/39e6d9ba420a/disk-3729e22e.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/97911d116426/bsd-3729e22e.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/25607c7d53e2/kernel-3729e22e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fc140c...@syzkaller.appspotmail.com
uvm_fault(0xffffffff83a1c0d0, 0x0, 0, 2) -> e
kernel: page fault trap, code=2
Stopped at pool_gc_pages+0x2bf: movq %rax,0(%rcx)
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*309001 85968 0 0x14000 0x200 0 systqmp
pool_gc_pages(0) at pool_gc_pages+0x2bf pool_p_remove sys/kern/subr_pool.c:1055 [inline]
pool_gc_pages(0) at pool_gc_pages+0x2bf sys/kern/subr_pool.c:1584
taskq_thread(ffffffff8383f870) at taskq_thread+0x157 sys/kern/kern_task.c:446
end trace frame: 0x0, count: 13
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: uvm_fault(0xffffffff83a1c0d0, 0x0, 0, 2) -> e
ddb{0}> trace
pool_gc_pages(0) at pool_gc_pages+0x2bf pool_p_remove sys/kern/subr_pool.c:1055 [inline]
pool_gc_pages(0) at pool_gc_pages+0x2bf sys/kern/subr_pool.c:1584
taskq_thread(ffffffff8383f870) at taskq_thread+0x157 sys/kern/kern_task.c:446
end trace frame: 0x0, count: -2
ddb{0}> show registers
rdi 0
rsi 0xffffffff8393a1c0 inpcb_pool+0x68
rbp 0xffff80002a20a090
rbx 0xfffffd806c728f90
rdx 0xffffffff8393a1c0 inpcb_pool+0x68
rcx 0
rax 0
r8 0xffffffffffffffff
r9 0
r10 0x8ef37d0e1b3bac00
r11 0x6d73c49e90f393e
r12 0x1dcd65000
r13 0xffffffff8393a160 inpcb_pool+0x8
r14 0xf90
r15 0xffffffff8393a158 inpcb_pool
rip 0xffffffff823101bf pool_gc_pages+0x2bf
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80002a20a050
ss 0x10
pool_gc_pages+0x2bf: movq %rax,0(%rcx)
ddb{0}> show proc
PROC (systqmp) tid=309001 pid=85968 tcnt=1 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
runpri=50, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000ffffe298,0xffff8000ffffea70
process=0xffff8000ffff9810 user=0xffff80002a205000, vmspace=0xffffffff83a1c0d0
estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
8071 233398 46342 0 2 0 syz-executor
8071 306592 46342 0 2 0x4000000 syz-executor
50300 386002 82191 0 2 0 syz-executor
50300 299128 82191 0 3 0x4000080 fsleep syz-executor
22507 245503 73945 0 2 0xc80 syz-executor
22507 471741 73945 0 3 0x4000080 netacc syz-executor
22507 163384 73945 0 3 0x4000080 fsleep syz-executor
17492 98278 25247 0 2 0xc80 syz-executor
17492 240963 25247 0 3 0x4000080 lockf syz-executor
17492 388608 25247 0 3 0x4000080 fsleep syz-executor
44525 321869 1 0 3 0x100083 ttyin getty
35546 116114 10637 0 3 0x82 wait syz-executor
27004 489234 0 0 3 0x14280 nfsidl nfsio
88156 39648 0 0 3 0x14280 nfsidl nfsio
77612 230202 0 0 3 0x14280 nfsidl nfsio
29814 198271 0 0 3 0x14280 nfsidl nfsio
22678 413950 0 0 3 0x14280 nfsidl nfsio
8096 423984 0 0 3 0x14280 nfsidl nfsio
74643 505036 0 0 3 0x14280 nfsidl nfsio
50677 57282 0 0 3 0x14280 nfsidl nfsio
59125 407559 0 0 3 0x14280 nfsidl nfsio
72908 360506 0 0 3 0x14280 nfsidl nfsio
43767 332087 0 0 3 0x14280 nfsidl nfsio
42570 334975 0 0 3 0x14280 nfsidl nfsio
28797 111968 0 0 3 0x14280 nfsidl nfsio
33872 65252 0 0 3 0x14280 nfsidl nfsio
5504 17834 0 0 3 0x14280 nfsidl nfsio
83666 382708 0 0 3 0x14280 nfsidl nfsio
42941 95656 0 0 3 0x14280 nfsidl nfsio
80443 325192 0 0 3 0x14280 nfsidl nfsio
40032 451986 0 0 3 0x14280 nfsidl nfsio
46958 165272 0 0 3 0x14280 nfsidl nfsio
74906 224579 10637 0 2 0xc82 syz-executor
15798 295690 10637 0 2 0x2 syz-executor
73945 476673 10637 0 2 0xc82 syz-executor
46342 10236 10637 0 2 0xc82 syz-executor
82191 370390 10637 0 2 0xc82 syz-executor
25247 102518 10637 0 2 0xc82 syz-executor
46748 266665 10637 0 3 0x82 piperd syz-executor
10637 425761 2894 0 2 0x2 syz-executor
2894 433452 61755 0 3 0x10008a sigsusp ksh
61755 503902 50334 0 3 0x98 kqread sshd-session
50334 19397 54932 0 3 0x92 kqread sshd-session
54932 154560 1 0 3 0x88 kqread sshd
87137 428322 20295 74 2 0x1100012 pflogd
20295 16326 1 0 3 0x80 sbwait pflogd
24365 193937 20722 73 3 0x1100090 kqread syslogd
20722 377142 1 0 3 0x100082 sbwait syslogd
78332 494209 1 0 3 0x100080 kqread resolvd
41404 323727 92596 77 3 0x100092 kqread dhcpleased
67055 106749 92596 77 3 0x100092 kqread dhcpleased
92596 487043 1 0 3 0x80 kqread dhcpleased
5169 272177 0 0 3 0x14200 bored smr
94931 139611 0 0 2 0x14200 zerothread
98218 462500 0 0 3 0x14200 aiodoned aiodoned
87878 135215 0 0 3 0x14200 syncer update
92659 113015 0 0 3 0x14200 cleaner cleaner
46699 290049 0 0 3 0x14200 reaper reaper
20210 523264 0 0 3 0x14200 pgdaemon pagedaemon
36701 462078 0 0 3 0x14200 bored viomb
61493 393433 0 0 3 0x40014200 acpi0 acpi0
64435 210967 0 0 7 0x40014200 idle1
78015 106729 0 0 3 0x14200 bored softnet1
33047 297431 0 0 3 0x14200 bored softnet0
*85968 309001 0 0 7 0x14200 systqmp
25984 367270 0 0 3 0x14200 bored systq
36885 328670 0 0 2 0x14200 softclockmp
64340 93428 0 0 2 0x40014200 softclock
71009 33304 0 0 3 0x40014200 idle0
1 109622 0 0 3 0x82 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex inpcb r = 0 (0xffffffff8393a170)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter_try+0x1aa sys/kern/kern_lock.c:-1
#2 pool_gc_pages+0xf4 pl_enter_try sys/kern/subr_pool.c:109 [inline]
#2 pool_gc_pages+0xf4 sys/kern/subr_pool.c:1576
#3 taskq_thread+0x157 sys/kern/kern_task.c:446
#4 proc_trampoline+0x10
Process 85968 (systqmp) thread 0xffff8000ffffe530 (309001)
shared rwlock pools r = 0 (0xffffffff8383e7b8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 pool_gc_pages+0x2e sys/kern/subr_pool.c:1568
#3 taskq_thread+0x157 sys/kern/kern_task.c:446
#4 proc_trampoline+0x10
shared rwlock systqmp r = 0 (0xffffffff8383f8e8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
exclusive mutex inpcb r = 0 (0xffffffff8393a170)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter_try+0x1aa sys/kern/kern_lock.c:-1
#2 pool_gc_pages+0xf4 pl_enter_try sys/kern/subr_pool.c:109 [inline]
#2 pool_gc_pages+0xf4 sys/kern/subr_pool.c:1576
#3 taskq_thread+0x157 sys/kern/kern_task.c:446
#4 proc_trampoline+0x10
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11066 12085K 12343K 166960K 13338 0
pcb 20 16K 21K 166960K 637 0
rtable 178 10K 12K 166960K 771 0
pf 33 17K 81K 166960K 224 0
ifaddr 32 5K 8K 166960K 165 0
ifgroup 51 2K 2K 166960K 275 0
sysctl 4 1K 9K 166960K 14 0
counters 68 36K 38K 166960K 316 0
ioctlops 0 0K 4K 166960K 2021 0
iov 0 0K 24K 166960K 122 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1325 83K 85K 166960K 2369 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 2K 5K 166960K 10 0
VM map 2 1K 1K 166960K 2 0
sem 15 0K 0K 166960K 73 0
dirhash 12 2K 2K 166960K 48 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 16 57K 236K 166960K 1843 0
sigio 0 0K 0K 166960K 60 0
proc 72 115K 164K 166960K 805 0
subproc 72 4K 4K 166960K 108 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 201 0
in_multi 56 4K 8K 166960K 234 0
ether_multi 1 0K 0K 166960K 13 0
mrt 0 0K 0K 166960K 14 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 91 413K 413K 166960K 91 0
exec 0 0K 1K 166960K 984 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 2 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 239 172K 181K 166960K 18014 0
UVM aobj 44 10K 10K 166960K 51 0
pinsyscall 41 82K 108K 166960K 3160 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 1 0K 0K 166960K 115 0
NDP 12 0K 1K 166960K 117 0
temp 78 8688K 8763K 166960K 90784 0
kqueue 15 24K 32K 166960K 341 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 26 0 0 1 0 1 1 0 8 0
rtpcb 120 242 0 239 2 1 1 2 0 8 0
rtentry 176 212 0 150 6 1 5 6 0 8 0
unpcb 144 1387 0 1369 9 5 4 6 0 8 3
syncache 336 13 0 13 3 2 1 1 0 8 1
tcpqe 32 6 0 6 2 1 1 1 0 8 1
tcpcb 736 435 0 422 2 0 2 2 0 8 0
arp 136 30 0 19 1 0 1 1 0 8 0
inpcb 328 1840 0 1821 14 10 4 9 0 8 2
inpcb: pool(0xffffffff8393a158:inpcb): page inconsistency: page 0x0; at page head addr 0xfffffd806c728f90 (p 0xfffffd806c728000)
nd6 152 52 0 36 2 0 2 2 0 8 0
pkpcb 40 16 0 16 2 2 0 1 0 8 0
kcovpl 48 12 0 4 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 1 0 1 0 8 0
ppxss 1192 100 0 99 1 0 1 1 0 8 0
pppxif 1504 13 0 13 3 3 0 1 0 8 0
pffrag 232 18 0 4 1 0 1 1 0 482 0
pffrnode 88 16 0 3 1 0 1 1 0 8 0
pffrent 40 26 0 12 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 1 0 1 1 1 0 1 0 8 0
pfstitem 24 2 0 0 1 0 1 1 0 8 0
pfstkey 128 2 0 0 1 0 1 1 0 8 0
pfstate 448 1 0 0 1 0 1 1 0 8 0
rttmr 136 3 0 3 2 2 0 1 0 8 0
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 986 0 710 30 6 24 30 0 8 4
art_table 40 988 0 710 5 0 5 5 0 8 0
art_node 32 211 0 155 1 0 1 1 0 8 0
sysvmsgpl 40 72 0 69 1 0 1 1 0 8 0
semapl 112 66 0 53 1 0 1 1 0 8 0
shmpl 112 42 0 4 2 0 2 2 0 8 0
dirhash 1024 41 0 24 3 0 3 3 0 8 0
dino2pl 256 4741 0 3235 96 0 96 96 0 8 0
ffsino 296 4741 0 3235 117 0 117 117 0 8 0
nchpl 144 7162 0 5444 64 0 64 64 0 8 0
rtmask 32 15 0 15 4 3 1 1 0 8 1
vnodes 216 5168 0 0 288 0 288 288 0 8 0
namei 1024 24433 0 24433 2 1 1 2 0 8 1
percpumem 16 173 0 124 1 0 1 1 0 8 0
vcpupl 3968 4 0 1 1 0 1 1 0 8 0
vmpool 848 6 0 3 1 0 1 1 0 8 0
kstatmem 264 186 0 160 3 0 3 3 0 8 1
scsiplug 72 7 0 7 3 2 1 1 0 8 1
scxspl 216 47614 0 47613 12 10 2 8 1 8 1
plimitpl 152 604 0 587 1 0 1 1 0 8 0
sigapl 424 2199 0 2133 10 2 8 8 0 8 0
knotepl 120 563 0 0 17 0 17 17 0 8 0
kqueuepl 224 740 0 728 9 7 2 9 0 8 1
pipepl 344 297 0 270 6 3 3 6 0 8 0
fdescpl 528 2139 0 2109 3 0 3 3 0 8 0
filepl 160 12685 0 12460 19 6 13 16 0 8 0
lockfpl 104 542 0 538 1 0 1 1 0 8 0
lockfspl 48 188 0 185 1 0 1 1 0 8 0
sessionpl 144 39 0 30 1 0 1 1 0 8 0
pgrppl 48 73 0 56 1 0 1 1 0 8 0
ucredpl 104 1947 0 1933 1 0 1 1 0 8 0
zombiepl 144 2135 0 2133 1 0 1 1 0 8 0
processpl 1232 2199 0 2133 6 0 6 6 0 8 0
procpl 664 4923 0 4851 9 1 8 8 0 8 0
sosppl 176 4 0 4 2 2 0 1 0 8 0
sockpl 752 3541 0 3500 26 14 12 17 0 8 6
mcl64k 65536 6 0 0 1 0 1 1 0 8 0
mcl16k 16384 4 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 10 0 0 2 0 2 2 0 8 0
mcl4k 4096 118 0 0 15 0 15 15 0 8 0
mcl2k2 2112 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 33 0 0 4 0 4 4 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 1254 0 0 79 0 79 79 0 8 0
bufpl 280 18901 0 12765 439 0 439 439 0 8 0
anonpl 32 17903 0 0 145 0 145 145 0 246 0
amapchunkpl 152 61152 0 60681 37 5 32 32 0 158 9
amappl16 200 7835 0 7802 72 58 14 47 0 8 8
amappl15 192 3 0 3 1 1 0 1 0 8 0
amappl14 184 11 0 11 1 1 0 1 0 8 0
amappl13 176 484 0 483 1 0 1 1 0 8 0
amappl12 168 2599 0 2558 3 0 3 3 0 8 0
amappl11 160 8 0 8 2 2 0 1 0 8 0
amappl10 152 58 0 43 1 0 1 1 0 8 0
amappl9 144 247 0 247 1 1 0 1 0 8 0
amappl8 136 30 0 27 1 0 1 1 0 8 0
amappl7 128 113 0 111 1 0 1 1 0 8 0
amappl6 120 348 0 334 1 0 1 1 0 8 0
amappl5 112 86 0 76 1 0 1 1 0 8 0
amappl4 104 513 0 484 1 0 1 1 0 8 0
amappl3 96 10952 0 10861 4 1 3 3 0 8 0
amappl2 88 2342 0 2263 2 0 2 2 0 8 0
amappl1 80 19458 0 18876 15 1 14 15 0 8 0
amappl 88 16892 0 16733 6 1 5 5 0 92 0
uvmvnodes 80 157 0 0 4 0 4 4 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma2048 2048 2 0 2 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 128 254 0 254 2 2 0 1 0 8 0
dma64 64 7 0 7 2 2 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 50 0 7 1 0 1 1 0 8 0
uaddrrnd 24 2139 0 2109 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 2139 0 2109 1 0 1 1 0 8 0
vmmpekpl 168 17892 0 17833 4 0 4 4 0 8 0
vmmpepl 168 143689 0 141817 124 26 98 124 0 357 5
vmsppl 488 2138 0 2109 6 1 5 5 0 8 0
rwobjpl 80 39921 0 38794 43 13 30 41 0 8 0
pdppl 4096 4297 0 4227 109 35 74 85 0 8 4
pvpl 32 24141 0 0 196 1 195 195 0 265 0
pmappl 256 2144 0 2112 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 358 0 48 10 0 10 10 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
pool_gc_pages(0) at pool_gc_pages+0x2bf pool_p_remove sys/kern/subr_pool.c:1055 [inline]
pool_gc_pages(0) at pool_gc_pages+0x2bf sys/kern/subr_pool.c:1584
taskq_thread(ffffffff8383f870) at taskq_thread+0x157 sys/kern/kern_task.c:446
end trace frame: 0x0, count: -2
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff8000299ddff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224
sched_idle(ffff8000299ddff0) at sched_idle+0x391 sys/kern/kern_sched.c:191
end trace frame: 0x0, count: 10
ddb{1}> trace
x86_ipi_db(ffff8000299ddff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224
sched_idle(ffff8000299ddff0) at sched_idle+0x391 sys/kern/kern_sched.c:191
end trace frame: 0x0, count: -5
---
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