uvm_fault: shm_deallocate_segment
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syzbot
Jul 17, 2026, 7:08:30 AMJul 17
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 94b919120046 sync
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=17cf8cb9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=44f95ce2e1ffc6dbb452
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3d6568c28308/disk-94b91912.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/2c7d44b995b6/bsd-94b91912.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fab052dd7206/kernel-94b91912.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+44f95c...@syzkaller.appspotmail.com
uvm_fault(0xfffff1806d1922f0, 0x0, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at shm_deallocate_segment+0x3b: movq 0(%rax),%rdi
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*387903 61943 0 0 0x4000000 0 syz-executor
shm_deallocate_segment(fffff18072277d90) at shm_deallocate_segment+0x3b sys/kern/sysv_shm.c:157
sys_shmctl(ffff80003c918030,ffff80003a4cf070,ffff80003a4cefc0) at sys_shmctl+0x3cf sys/kern/sysv_shm.c:367
syscall(ffff80003a4cf070) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003a4cf070) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x444a9415440, count: 11
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>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xfffff1806d1922f0, 0x0, 0, 1) -> e
ddb> show kasan
No such command
ddb> trace
shm_deallocate_segment(fffff18072277d90) at shm_deallocate_segment+0x3b sys/kern/sysv_shm.c:157
sys_shmctl(ffff80003c918030,ffff80003a4cf070,ffff80003a4cefc0) at sys_shmctl+0x3cf sys/kern/sysv_shm.c:367
syscall(ffff80003a4cf070) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003a4cf070) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x444a9415440, count: -4
ddb> show registers
rdi 0xfffff18072277d90
rsi 0
rbp 0xffff80003a4ceec0
rbx 0
rdx 0
rcx 0xffff800045ff8918
rax 0
r8 0xffffffff821020f0 uvm_map_inentry_sp
r9 0
r10 0
r11 0x554cb999f586f9d8
r12 0
r13 0xfffff18072277d90
r14 0xfffff18072277d90
r15 0xfff
rip 0xffffffff82baa97b shm_deallocate_segment+0x3b
cs 0x8
rflags 0x10206 __ALIGN_SIZE+0xf206
rsp 0xffff80003a4cee90
ss 0x10
shm_deallocate_segment+0x3b: movq 0(%rax),%rdi
ddb> show proc
PROC (syz-executor) tid=387903 pid=61943 tcnt=3 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=73, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80003c919a20,0xffff80003c8fa030
process=0xffff800045ff8918 user=0xffff80003a4ca000, vmspace=0xfffff1806d1922f0
estcpu=23, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
1456 125089 67985 0 2 0 0 syz-executor
1456 184791 67985 0 2 0 0x4000000 syz-executor
1456 40870 67985 0 2 0 0x4000000 syz-executor
38877 182730 76092 0 2 0 0 syz-executor
38877 521942 76092 0 3 0 0x4000080 fsleep syz-executor
77354 297008 53169 0 2 0 0 syz-executor
77354 283184 53169 0 3 0 0x4000080 fsleep syz-executor
61943 441527 89789 0 2 0 0 syz-executor
61943 509072 89789 0 2 0 0x4000000 syz-executor
*61943 387903 89789 0 7 0 0x4000000 syz-executor
67590 452872 87202 0 2 0 0 syz-executor
67590 8551 87202 0 3 0 0x4000080 fsleep syz-executor
67590 81132 87202 0 3 0 0x4000080 fsleep syz-executor
13675 201426 28785 0 2 0 0 syz-executor
13675 212212 28785 0 3 0 0x4000080 sbwait syz-executor
13675 219213 28785 0 3 0 0x4000080 fsleep syz-executor
13675 262276 28785 0 2 0 0x4000000 syz-executor
22379 316069 31135 0 2 0 0 syz-executor
22379 431972 31135 0 3 0 0x4000080 fsleep syz-executor
99353 316224 0 0 3 0x14000 0x280 nfsidl nfsio
49642 177121 0 0 3 0x14000 0x280 nfsidl nfsio
59137 141257 0 0 3 0x14000 0x280 nfsidl nfsio
93834 7183 0 0 3 0x14000 0x280 nfsidl nfsio
22437 379868 0 0 3 0x14000 0x280 nfsidl nfsio
31667 296333 0 0 3 0x14000 0x280 nfsidl nfsio
53735 470271 0 0 3 0x14000 0x280 nfsidl nfsio
85134 213221 0 0 3 0x14000 0x280 nfsidl nfsio
60713 271476 0 0 3 0x14000 0x280 nfsidl nfsio
41975 251501 0 0 3 0x14000 0x280 nfsidl nfsio
57954 283270 0 0 3 0x14000 0x280 nfsidl nfsio
44599 247253 0 0 3 0x14000 0x280 nfsidl nfsio
27888 224360 0 0 3 0x14000 0x280 nfsidl nfsio
97440 261811 0 0 3 0x14000 0x280 nfsidl nfsio
19297 305143 0 0 3 0x14000 0x280 nfsidl nfsio
93423 492335 0 0 3 0x14000 0x280 nfsidl nfsio
13489 367141 0 0 3 0x14000 0x280 nfsidl nfsio
3312 504484 0 0 3 0x14000 0x280 nfsidl nfsio
26588 428697 0 0 3 0x14000 0x280 nfsidl nfsio
40062 91414 0 0 3 0x14000 0x280 nfsidl nfsio
76092 395070 69088 0 2 0x2 0x1 syz-executor
31135 14117 69088 0 2 0x2 0x1 syz-executor
87202 100384 69088 0 2 0x2 0x1 syz-executor
28785 278514 69088 0 2 0x2 0x1 syz-executor
53169 193278 69088 0 2 0x2 0x1 syz-executor
89789 34120 69088 0 2 0x2 0x1 syz-executor
67985 315777 69088 0 2 0x2 0x1 syz-executor
29475 13429 69088 0 2 0x10000002 0x1 syz-executor
69088 442562 10758 0 3 0x2 0x80 kqread syz-executor
10758 85376 58199 0 3 0x100002 0x88 sigsusp ksh
58199 455634 40114 0 3 0x10 0x88 kqread sshd-session
40114 58558 38580 0 3 0x12 0x80 kqread sshd-session
1761 136120 1 0 3 0x100003 0x80 ttyin getty
38580 88478 1 0 3 0 0x88 kqread sshd
10929 136164 58083 73 3 0x1100010 0x80 kqread syslogd
58083 127654 1 0 3 0x100002 0x80 sbwait syslogd
75857 189279 1 0 3 0x100000 0x80 kqread resolvd
90112 398831 38937 77 3 0x100012 0x80 kqread dhcpleased
50380 490164 38937 77 3 0x100012 0x80 kqread dhcpleased
38937 506216 1 0 3 0 0x80 kqread dhcpleased
20172 342204 0 0 3 0x14000 0x200 bored smr
61698 279739 0 0 2 0x14000 0x200 zerothread
75982 393311 0 0 3 0x14000 0x200 aiodoned aiodoned
84962 522201 0 0 3 0x14000 0x200 syncer update
14008 469403 0 0 3 0x14000 0x200 cleaner cleaner
47197 124821 0 0 3 0x14000 0x200 reaper reaper
164 470257 0 0 3 0x14000 0x200 pgdaemon pagedaemon
78926 300258 0 0 3 0x14000 0x200 bored viomb
16847 356337 0 0 3 0x14000 0x40000200 acpi0 acpi0
64897 310667 0 0 3 0x14000 0x200 bored softnet0
60170 342040 0 0 3 0x14000 0x200 bored systqmp
55722 370643 0 0 3 0x14000 0x200 bored systq
59910 16505 0 0 3 0x14000 0x40000200 tmoslp softclock
53943 365263 0 0 3 0x14000 0x40000200 idle0
1 162104 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11029 12102K 12363K 166960K 12229 0
pcb 19 12K 12K 166960K 35 0
rtable 239 7K 7K 166960K 357 0
pf 32 13K 15K 166960K 44 0
ifaddr 42 7K 7K 166960K 51 0
ifgroup 50 2K 2K 166960K 63 0
sysctl 1 1K 9K 166960K 7 0
counters 33 17K 18K 166960K 39 0
ioctlops 0 0K 4K 166960K 48 0
iov 0 0K 12K 166960K 2 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1326 83K 84K 166960K 1454 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 3 5K 5K 166960K 3 0
VM map 2 1K 1K 166960K 2 0
sem 10 0K 0K 166960K 11 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 291K 166960K 11964 0
file desc 17 61K 97K 166960K 223 0
sigio 0 0K 0K 166960K 5 0
proc 60 59K 124K 166960K 511 0
subproc 72 4K 4K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 8 0
in_multi 99 7K 7K 166960K 101 0
ether_multi 1 0K 0K 166960K 2 0
mrt 0 0K 0K 166960K 4 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 55 254K 254K 166960K 55 0
exec 0 0K 1K 166960K 377 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 217 142K 152K 166960K 3563 0
UVM aobj 3 2K 2K 166960K 3 0
pinsyscall 38 76K 96K 166960K 1323 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 2 0
NDP 11 0K 2K 166960K 32 0
temp 37 9110K 9174K 166960K 4991 0
kqueue 13 20K 31K 166960K 49 0
SYN cache 2 16K 16K 166960K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 42 0 38 1 0 1 1 0 8 0
rtentry 136 111 0 1 4 0 4 4 0 8 0
unpcb 144 135 0 116 4 0 4 4 0 8 3
syncache 336 4 0 4 1 1 0 1 0 8 0
tcpcb 736 32 0 27 1 0 1 1 0 8 0
arp 96 18 0 0 1 0 1 1 0 8 0
ipq 40 2 0 1 1 0 1 1 0 8 0
ipqe 40 3 0 2 1 0 1 1 0 8 0
inpcb 328 127 0 115 2 0 2 2 0 8 0
nd6 112 24 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 0 1 1 0 8 1
ppxss 1072 5 0 5 1 0 1 1 0 8 1
pfstscr 40 6 0 2 1 0 1 1 0 8 0
pfstitem 24 4 0 0 1 0 1 1 0 8 0
pfstkey 128 6 0 2 1 0 1 1 0 8 0
pfstate 384 3 0 1 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 452 0 0 29 0 29 29 0 8 0
art_table 40 453 0 0 5 0 5 5 0 8 0
art_node 32 111 0 11 1 0 1 1 0 8 0
semapl 72 8 0 0 1 0 1 1 0 8 0
shmpl 112 1 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1712 0 256 92 0 92 92 0 8 0
ffsino 256 1712 0 256 92 0 92 92 0 8 0
nchpl 144 2041 0 350 64 0 64 64 0 8 0
vnodes 216 1864 0 0 104 0 104 104 0 8 0
namei 1024 6018 0 6018 2 1 1 2 0 8 1
kstatmem 264 33 0 10 2 0 2 2 0 8 0
scsiplug 72 1 0 1 1 1 0 1 0 8 0
scxspl 216 6649 0 6649 3 2 1 3 1 8 1
plimitpl 152 40 0 23 1 0 1 1 0 8 0
sigapl 424 538 0 475 9 1 8 8 0 8 0
knotepl 120 6420 0 6373 9 0 9 9 0 8 7
kqueuepl 184 59 0 49 1 0 1 1 0 8 0
pipepl 304 127 0 100 3 0 3 3 0 8 0
fdescpl 448 505 0 476 5 1 4 5 0 8 0
filepl 120 1985 0 1765 10 0 10 10 0 8 2
lockfpl 104 23 0 21 1 0 1 1 0 8 0
lockfspl 48 12 0 10 1 0 1 1 0 8 0
sessionpl 144 28 0 20 1 0 1 1 0 8 0
pgrppl 48 38 0 22 1 0 1 1 0 8 0
ucredpl 104 176 0 165 1 0 1 1 0 8 0
zombiepl 144 525 0 524 1 0 1 1 0 8 0
processpl 1152 538 0 475 5 0 5 5 0 8 0
procpl 664 695 0 618 7 0 7 7 0 8 0
sosppl 176 3 0 3 1 0 1 1 0 8 1
sockpl 552 305 0 270 7 0 7 7 0 8 4
mcl64k 65536 34 0 34 2 1 1 1 0 8 1
mcl16k 16384 17 0 17 2 1 1 1 0 8 1
mcl12k 12288 4 0 4 2 1 1 1 0 8 1
mcl9k128 9344 4 0 4 1 0 1 1 0 8 1
mcl8k 8192 16 0 16 2 1 1 1 0 8 1
mcl4k 4096 2660 0 2608 14 6 8 14 0 8 0
mcl2k 2048 170 0 170 2 1 1 1 0 8 1
mextrefs 64 135 0 135 1 0 1 1 0 8 1
mtagpl 96 4 0 4 1 1 0 1 0 8 0
mbufpl 256 5241 0 5093 11 0 11 11 0 8 0
bufpl 272 2479 0 136 157 0 157 157 0 8 0
anonpl 24 91543 0 88386 45 0 45 45 0 187 22
amapchunkpl 152 10276 0 9821 25 0 25 25 0 158 5
amappl16 200 1367 0 1340 14 4 10 14 0 8 8
amappl15 192 2 0 2 1 1 0 1 0 8 0
amappl14 184 407 0 406 1 0 1 1 0 8 0
amappl13 176 181 0 171 1 0 1 1 0 8 0
amappl12 168 772 0 744 2 0 2 2 0 8 0
amappl11 160 65 0 65 1 1 0 1 0 8 0
amappl10 152 58 0 48 1 0 1 1 0 8 0
amappl9 144 271 0 271 1 1 0 1 0 8 0
amappl8 136 94 0 93 1 0 1 1 0 8 0
amappl7 128 148 0 136 1 0 1 1 0 8 0
amappl6 120 171 0 170 1 0 1 1 0 8 0
amappl5 112 90 0 83 1 0 1 1 0 8 0
amappl4 104 277 0 262 1 0 1 1 0 8 0
amappl3 96 2026 0 1921 4 0 4 4 0 8 0
amappl2 88 532 0 479 2 0 2 2 0 8 0
amappl1 80 10534 0 9974 14 1 13 14 0 8 1
amappl 88 2865 0 2711 5 0 5 5 0 92 0
uvmvnodes 80 96 0 0 2 0 2 2 0 8 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 19 0 18 1 0 1 1 0 8 0
aobjpl 72 3 0 0 1 0 1 1 0 8 0
uaddrrnd 24 505 0 476 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 505 0 476 1 0 1 1 0 8 0
vmmpekpl 168 5990 0 5966 2 0 2 2 0 8 0
vmmpepl 168 41209 0 39426 91 0 91 91 0 357 11
vmsppl 368 504 0 476 4 1 3 4 0 8 0
rwobjpl 40 14605 0 13674 12 0 12 12 0 8 1
pdppl 4096 1016 0 952 98 32 66 82 0 8 2
pvpl 32 237659 0 229102 120 0 120 120 0 265 42
pmappl 216 504 0 476 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 522 0 48 14 0 14 14 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
shm_deallocate_segment(fffff18072277d90) at shm_deallocate_segment+0x3b sys/kern/sysv_shm.c:157
sys_shmctl(ffff80003c918030,ffff80003a4cf070,ffff80003a4cefc0) at sys_shmctl+0x3cf sys/kern/sysv_shm.c:367
syscall(ffff80003a4cf070) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003a4cf070) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x444a9415440, count: -4
ddb> machine ddbcpu 1
No such command
ddb> trace
shm_deallocate_segment(fffff18072277d90) at shm_deallocate_segment+0x3b sys/kern/sysv_shm.c:157
sys_shmctl(ffff80003c918030,ffff80003a4cf070,ffff80003a4cefc0) at sys_shmctl+0x3cf sys/kern/sysv_shm.c:367
syscall(ffff80003a4cf070) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003a4cf070) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x444a9415440, count: -4
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#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: 94b919120046 sync
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=17cf8cb9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=44f95ce2e1ffc6dbb452
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3d6568c28308/disk-94b91912.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/2c7d44b995b6/bsd-94b91912.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fab052dd7206/kernel-94b91912.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+44f95c...@syzkaller.appspotmail.com
uvm_fault(0xfffff1806d1922f0, 0x0, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at shm_deallocate_segment+0x3b: movq 0(%rax),%rdi
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*387903 61943 0 0 0x4000000 0 syz-executor
shm_deallocate_segment(fffff18072277d90) at shm_deallocate_segment+0x3b sys/kern/sysv_shm.c:157
sys_shmctl(ffff80003c918030,ffff80003a4cf070,ffff80003a4cefc0) at sys_shmctl+0x3cf sys/kern/sysv_shm.c:367
syscall(ffff80003a4cf070) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003a4cf070) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x444a9415440, count: 11
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>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xfffff1806d1922f0, 0x0, 0, 1) -> e
ddb> show kasan
No such command
ddb> trace
shm_deallocate_segment(fffff18072277d90) at shm_deallocate_segment+0x3b sys/kern/sysv_shm.c:157
sys_shmctl(ffff80003c918030,ffff80003a4cf070,ffff80003a4cefc0) at sys_shmctl+0x3cf sys/kern/sysv_shm.c:367
syscall(ffff80003a4cf070) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003a4cf070) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x444a9415440, count: -4
ddb> show registers
rdi 0xfffff18072277d90
rsi 0
rbp 0xffff80003a4ceec0
rbx 0
rdx 0
rcx 0xffff800045ff8918
rax 0
r8 0xffffffff821020f0 uvm_map_inentry_sp
r9 0
r10 0
r11 0x554cb999f586f9d8
r12 0
r13 0xfffff18072277d90
r14 0xfffff18072277d90
r15 0xfff
rip 0xffffffff82baa97b shm_deallocate_segment+0x3b
cs 0x8
rflags 0x10206 __ALIGN_SIZE+0xf206
rsp 0xffff80003a4cee90
ss 0x10
shm_deallocate_segment+0x3b: movq 0(%rax),%rdi
ddb> show proc
PROC (syz-executor) tid=387903 pid=61943 tcnt=3 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=73, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80003c919a20,0xffff80003c8fa030
process=0xffff800045ff8918 user=0xffff80003a4ca000, vmspace=0xfffff1806d1922f0
estcpu=23, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
1456 125089 67985 0 2 0 0 syz-executor
1456 184791 67985 0 2 0 0x4000000 syz-executor
1456 40870 67985 0 2 0 0x4000000 syz-executor
38877 182730 76092 0 2 0 0 syz-executor
38877 521942 76092 0 3 0 0x4000080 fsleep syz-executor
77354 297008 53169 0 2 0 0 syz-executor
77354 283184 53169 0 3 0 0x4000080 fsleep syz-executor
61943 441527 89789 0 2 0 0 syz-executor
61943 509072 89789 0 2 0 0x4000000 syz-executor
*61943 387903 89789 0 7 0 0x4000000 syz-executor
67590 452872 87202 0 2 0 0 syz-executor
67590 8551 87202 0 3 0 0x4000080 fsleep syz-executor
67590 81132 87202 0 3 0 0x4000080 fsleep syz-executor
13675 201426 28785 0 2 0 0 syz-executor
13675 212212 28785 0 3 0 0x4000080 sbwait syz-executor
13675 219213 28785 0 3 0 0x4000080 fsleep syz-executor
13675 262276 28785 0 2 0 0x4000000 syz-executor
22379 316069 31135 0 2 0 0 syz-executor
22379 431972 31135 0 3 0 0x4000080 fsleep syz-executor
99353 316224 0 0 3 0x14000 0x280 nfsidl nfsio
49642 177121 0 0 3 0x14000 0x280 nfsidl nfsio
59137 141257 0 0 3 0x14000 0x280 nfsidl nfsio
93834 7183 0 0 3 0x14000 0x280 nfsidl nfsio
22437 379868 0 0 3 0x14000 0x280 nfsidl nfsio
31667 296333 0 0 3 0x14000 0x280 nfsidl nfsio
53735 470271 0 0 3 0x14000 0x280 nfsidl nfsio
85134 213221 0 0 3 0x14000 0x280 nfsidl nfsio
60713 271476 0 0 3 0x14000 0x280 nfsidl nfsio
41975 251501 0 0 3 0x14000 0x280 nfsidl nfsio
57954 283270 0 0 3 0x14000 0x280 nfsidl nfsio
44599 247253 0 0 3 0x14000 0x280 nfsidl nfsio
27888 224360 0 0 3 0x14000 0x280 nfsidl nfsio
97440 261811 0 0 3 0x14000 0x280 nfsidl nfsio
19297 305143 0 0 3 0x14000 0x280 nfsidl nfsio
93423 492335 0 0 3 0x14000 0x280 nfsidl nfsio
13489 367141 0 0 3 0x14000 0x280 nfsidl nfsio
3312 504484 0 0 3 0x14000 0x280 nfsidl nfsio
26588 428697 0 0 3 0x14000 0x280 nfsidl nfsio
40062 91414 0 0 3 0x14000 0x280 nfsidl nfsio
76092 395070 69088 0 2 0x2 0x1 syz-executor
31135 14117 69088 0 2 0x2 0x1 syz-executor
87202 100384 69088 0 2 0x2 0x1 syz-executor
28785 278514 69088 0 2 0x2 0x1 syz-executor
53169 193278 69088 0 2 0x2 0x1 syz-executor
89789 34120 69088 0 2 0x2 0x1 syz-executor
67985 315777 69088 0 2 0x2 0x1 syz-executor
29475 13429 69088 0 2 0x10000002 0x1 syz-executor
69088 442562 10758 0 3 0x2 0x80 kqread syz-executor
10758 85376 58199 0 3 0x100002 0x88 sigsusp ksh
58199 455634 40114 0 3 0x10 0x88 kqread sshd-session
40114 58558 38580 0 3 0x12 0x80 kqread sshd-session
1761 136120 1 0 3 0x100003 0x80 ttyin getty
38580 88478 1 0 3 0 0x88 kqread sshd
10929 136164 58083 73 3 0x1100010 0x80 kqread syslogd
58083 127654 1 0 3 0x100002 0x80 sbwait syslogd
75857 189279 1 0 3 0x100000 0x80 kqread resolvd
90112 398831 38937 77 3 0x100012 0x80 kqread dhcpleased
50380 490164 38937 77 3 0x100012 0x80 kqread dhcpleased
38937 506216 1 0 3 0 0x80 kqread dhcpleased
20172 342204 0 0 3 0x14000 0x200 bored smr
61698 279739 0 0 2 0x14000 0x200 zerothread
75982 393311 0 0 3 0x14000 0x200 aiodoned aiodoned
84962 522201 0 0 3 0x14000 0x200 syncer update
14008 469403 0 0 3 0x14000 0x200 cleaner cleaner
47197 124821 0 0 3 0x14000 0x200 reaper reaper
164 470257 0 0 3 0x14000 0x200 pgdaemon pagedaemon
78926 300258 0 0 3 0x14000 0x200 bored viomb
16847 356337 0 0 3 0x14000 0x40000200 acpi0 acpi0
64897 310667 0 0 3 0x14000 0x200 bored softnet0
60170 342040 0 0 3 0x14000 0x200 bored systqmp
55722 370643 0 0 3 0x14000 0x200 bored systq
59910 16505 0 0 3 0x14000 0x40000200 tmoslp softclock
53943 365263 0 0 3 0x14000 0x40000200 idle0
1 162104 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11029 12102K 12363K 166960K 12229 0
pcb 19 12K 12K 166960K 35 0
rtable 239 7K 7K 166960K 357 0
pf 32 13K 15K 166960K 44 0
ifaddr 42 7K 7K 166960K 51 0
ifgroup 50 2K 2K 166960K 63 0
sysctl 1 1K 9K 166960K 7 0
counters 33 17K 18K 166960K 39 0
ioctlops 0 0K 4K 166960K 48 0
iov 0 0K 12K 166960K 2 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1326 83K 84K 166960K 1454 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 3 5K 5K 166960K 3 0
VM map 2 1K 1K 166960K 2 0
sem 10 0K 0K 166960K 11 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 291K 166960K 11964 0
file desc 17 61K 97K 166960K 223 0
sigio 0 0K 0K 166960K 5 0
proc 60 59K 124K 166960K 511 0
subproc 72 4K 4K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 8 0
in_multi 99 7K 7K 166960K 101 0
ether_multi 1 0K 0K 166960K 2 0
mrt 0 0K 0K 166960K 4 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 55 254K 254K 166960K 55 0
exec 0 0K 1K 166960K 377 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 217 142K 152K 166960K 3563 0
UVM aobj 3 2K 2K 166960K 3 0
pinsyscall 38 76K 96K 166960K 1323 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 2 0
NDP 11 0K 2K 166960K 32 0
temp 37 9110K 9174K 166960K 4991 0
kqueue 13 20K 31K 166960K 49 0
SYN cache 2 16K 16K 166960K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 42 0 38 1 0 1 1 0 8 0
rtentry 136 111 0 1 4 0 4 4 0 8 0
unpcb 144 135 0 116 4 0 4 4 0 8 3
syncache 336 4 0 4 1 1 0 1 0 8 0
tcpcb 736 32 0 27 1 0 1 1 0 8 0
arp 96 18 0 0 1 0 1 1 0 8 0
ipq 40 2 0 1 1 0 1 1 0 8 0
ipqe 40 3 0 2 1 0 1 1 0 8 0
inpcb 328 127 0 115 2 0 2 2 0 8 0
nd6 112 24 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 0 1 1 0 8 1
ppxss 1072 5 0 5 1 0 1 1 0 8 1
pfstscr 40 6 0 2 1 0 1 1 0 8 0
pfstitem 24 4 0 0 1 0 1 1 0 8 0
pfstkey 128 6 0 2 1 0 1 1 0 8 0
pfstate 384 3 0 1 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 452 0 0 29 0 29 29 0 8 0
art_table 40 453 0 0 5 0 5 5 0 8 0
art_node 32 111 0 11 1 0 1 1 0 8 0
semapl 72 8 0 0 1 0 1 1 0 8 0
shmpl 112 1 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1712 0 256 92 0 92 92 0 8 0
ffsino 256 1712 0 256 92 0 92 92 0 8 0
nchpl 144 2041 0 350 64 0 64 64 0 8 0
vnodes 216 1864 0 0 104 0 104 104 0 8 0
namei 1024 6018 0 6018 2 1 1 2 0 8 1
kstatmem 264 33 0 10 2 0 2 2 0 8 0
scsiplug 72 1 0 1 1 1 0 1 0 8 0
scxspl 216 6649 0 6649 3 2 1 3 1 8 1
plimitpl 152 40 0 23 1 0 1 1 0 8 0
sigapl 424 538 0 475 9 1 8 8 0 8 0
knotepl 120 6420 0 6373 9 0 9 9 0 8 7
kqueuepl 184 59 0 49 1 0 1 1 0 8 0
pipepl 304 127 0 100 3 0 3 3 0 8 0
fdescpl 448 505 0 476 5 1 4 5 0 8 0
filepl 120 1985 0 1765 10 0 10 10 0 8 2
lockfpl 104 23 0 21 1 0 1 1 0 8 0
lockfspl 48 12 0 10 1 0 1 1 0 8 0
sessionpl 144 28 0 20 1 0 1 1 0 8 0
pgrppl 48 38 0 22 1 0 1 1 0 8 0
ucredpl 104 176 0 165 1 0 1 1 0 8 0
zombiepl 144 525 0 524 1 0 1 1 0 8 0
processpl 1152 538 0 475 5 0 5 5 0 8 0
procpl 664 695 0 618 7 0 7 7 0 8 0
sosppl 176 3 0 3 1 0 1 1 0 8 1
sockpl 552 305 0 270 7 0 7 7 0 8 4
mcl64k 65536 34 0 34 2 1 1 1 0 8 1
mcl16k 16384 17 0 17 2 1 1 1 0 8 1
mcl12k 12288 4 0 4 2 1 1 1 0 8 1
mcl9k128 9344 4 0 4 1 0 1 1 0 8 1
mcl8k 8192 16 0 16 2 1 1 1 0 8 1
mcl4k 4096 2660 0 2608 14 6 8 14 0 8 0
mcl2k 2048 170 0 170 2 1 1 1 0 8 1
mextrefs 64 135 0 135 1 0 1 1 0 8 1
mtagpl 96 4 0 4 1 1 0 1 0 8 0
mbufpl 256 5241 0 5093 11 0 11 11 0 8 0
bufpl 272 2479 0 136 157 0 157 157 0 8 0
anonpl 24 91543 0 88386 45 0 45 45 0 187 22
amapchunkpl 152 10276 0 9821 25 0 25 25 0 158 5
amappl16 200 1367 0 1340 14 4 10 14 0 8 8
amappl15 192 2 0 2 1 1 0 1 0 8 0
amappl14 184 407 0 406 1 0 1 1 0 8 0
amappl13 176 181 0 171 1 0 1 1 0 8 0
amappl12 168 772 0 744 2 0 2 2 0 8 0
amappl11 160 65 0 65 1 1 0 1 0 8 0
amappl10 152 58 0 48 1 0 1 1 0 8 0
amappl9 144 271 0 271 1 1 0 1 0 8 0
amappl8 136 94 0 93 1 0 1 1 0 8 0
amappl7 128 148 0 136 1 0 1 1 0 8 0
amappl6 120 171 0 170 1 0 1 1 0 8 0
amappl5 112 90 0 83 1 0 1 1 0 8 0
amappl4 104 277 0 262 1 0 1 1 0 8 0
amappl3 96 2026 0 1921 4 0 4 4 0 8 0
amappl2 88 532 0 479 2 0 2 2 0 8 0
amappl1 80 10534 0 9974 14 1 13 14 0 8 1
amappl 88 2865 0 2711 5 0 5 5 0 92 0
uvmvnodes 80 96 0 0 2 0 2 2 0 8 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 19 0 18 1 0 1 1 0 8 0
aobjpl 72 3 0 0 1 0 1 1 0 8 0
uaddrrnd 24 505 0 476 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 505 0 476 1 0 1 1 0 8 0
vmmpekpl 168 5990 0 5966 2 0 2 2 0 8 0
vmmpepl 168 41209 0 39426 91 0 91 91 0 357 11
vmsppl 368 504 0 476 4 1 3 4 0 8 0
rwobjpl 40 14605 0 13674 12 0 12 12 0 8 1
pdppl 4096 1016 0 952 98 32 66 82 0 8 2
pvpl 32 237659 0 229102 120 0 120 120 0 265 42
pmappl 216 504 0 476 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 522 0 48 14 0 14 14 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
shm_deallocate_segment(fffff18072277d90) at shm_deallocate_segment+0x3b sys/kern/sysv_shm.c:157
sys_shmctl(ffff80003c918030,ffff80003a4cf070,ffff80003a4cefc0) at sys_shmctl+0x3cf sys/kern/sysv_shm.c:367
syscall(ffff80003a4cf070) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003a4cf070) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x444a9415440, count: -4
ddb> machine ddbcpu 1
No such command
ddb> trace
shm_deallocate_segment(fffff18072277d90) at shm_deallocate_segment+0x3b sys/kern/sysv_shm.c:157
sys_shmctl(ffff80003c918030,ffff80003a4cf070,ffff80003a4cefc0) at sys_shmctl+0x3cf sys/kern/sysv_shm.c:367
syscall(ffff80003a4cf070) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003a4cf070) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x444a9415440, count: -4
---
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