uvm_fault(0xfffff50069c859a8, 0x0, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at sys_shmat+0x453: movq 0(%r15),%rdi
TID PID UID PRFLAGS PFLAGS CPU COMMAND
90393 27822 0 0 0 0 syz-executor
*379098 86586 0 0 0x4000000 1K syz-executor
sys_shmat(ffff800045fefca0,ffff80003a3a3b70,ffff80003a3a3ac0) at sys_shmat+0x453 sys/kern/sysv_shm.c:290
syscall(ffff80003a3a3b70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003a3a3b70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f1222a96e0, count: 12
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}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: uvm_fault(0xfffff50069c859a8, 0x0, 0, 1) -> e
ddb{1}> trace
sys_shmat(ffff800045fefca0,ffff80003a3a3b70,ffff80003a3a3ac0) at sys_shmat+0x453 sys/kern/sysv_shm.c:290
syscall(ffff80003a3a3b70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003a3a3b70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f1222a96e0, count: -3
ddb{1}> show registers
rdi 0
rsi 0
rbp 0xffff80003a3a3a90
rbx 0xfffff5006ca4fee0
rdx 0
rcx 0x1
rax 0x1
r8 0x180
r9 0xfffff500097fd3a8
r10 0
r11 0x98c2606492d2da0c
r12 0xffff800045fefca0
r13 0xffff800001600010
r14 0x3
r15 0
rip 0xffffffff81bdaee3 sys_shmat+0x453
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80003a3a3a00
ss 0x10
sys_shmat+0x453: movq 0(%r15),%rdi
ddb{1}> show proc
PROC (syz-executor) tid=379098 pid=86586 tcnt=4 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=86, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045fef4d8,0xffff80003c3b8560
process=0xffff80003c3d79e0 user=0xffff80003a39e000, vmspace=0xfffff50069c859a8
estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
52239 199691 25446 0 2 0 syz-executor
52239 174266 25446 0 2 0x4000000 syz-executor
27822 90393 39716 0 7 0 syz-executor
27822 307074 39716 0 3 0x4000080 fsleep syz-executor
27822 449835 39716 0 2 0x4000000 syz-executor
38130 155594 1 0 3 0x82 nanoslp getty
78613 275995 77650 0 2 0 syz-executor
78613 310499 77650 0 2 0x4000000 syz-executor
78613 59325 77650 0 3 0x4000080 kqpoll syz-executor
78613 466460 77650 0 3 0x4000080 fsleep syz-executor
96156 229075 72249 0 3 0 kmmaplk syz-executor
96156 239201 72249 0 3 0x4000080 fsleep syz-executor
86586 184350 99440 0 2 0 syz-executor
86586 515482 99440 0 2 0x4000000 syz-executor
*86586 379098 99440 0 7 0x4000000 syz-executor
86586 224586 99440 0 2 0x4000000 syz-executor
3972 301473 85862 0 3 0x100082 sbwait ndp
85862 157144 11388 0 3 0x10008a sigsusp sh
96258 89274 82012 0 3 0x82 nanoslp syz-executor
25446 405212 82012 0 3 0x82 nanoslp syz-executor
77650 387818 82012 0 3 0x82 nanoslp syz-executor
39716 496106 82012 0 3 0x82 nanoslp syz-executor
99440 268308 82012 0 3 0x82 nanoslp syz-executor
72249 442276 82012 0 3 0x82 nanoslp syz-executor
11388 329609 82012 0 3 0x82 wait syz-executor
82012 93288 13875 0 3 0x82 wait syz-executor
13875 243829 9268 0 3 0x10008a sigsusp ksh
9268 377727 41297 0 3 0x98 kqread sshd-session
41297 222788 65801 0 3 0x92 kqread sshd-session
65801 336056 1 0 3 0x88 kqread sshd
50218 14011 78438 74 3 0x1100092 bpf pflogd
78438 417805 1 0 3 0x80 sbwait pflogd
32231 143101 40520 73 3 0x1100090 kqread syslogd
40520 250119 1 0 3 0x100082 sbwait syslogd
2351 291334 1 0 3 0x100080 kqread resolvd
50896 443996 8641 77 3 0x100092 kqread dhcpleased
54355 257019 8641 77 3 0x100092 kqread dhcpleased
8641 225251 1 0 3 0x80 kqread dhcpleased
83983 215016 0 0 3 0x14200 bored smr
50800 325550 0 0 2 0x14200 zerothread
13801 512873 0 0 3 0x14200 aiodoned aiodoned
76029 408977 0 0 3 0x14200 syncer update
45686 524245 0 0 3 0x14200 cleaner cleaner
68137 248319 0 0 3 0x14200 reaper reaper
26593 126966 0 0 3 0x14200 pgdaemon pagedaemon
47986 159915 0 0 3 0x14200 bored viomb
27959 395547 0 0 3 0x40014200 acpi0 acpi0
9261 253974 0 0 3 0x40014200 idle1
99841 108436 0 0 3 0x14200 bored softnet1
59651 247491 0 0 3 0x14200 bored softnet0
15789 249342 0 0 3 0x14200 smrbar systqmp
58882 341318 0 0 3 0x14200 bored systq
42396 159498 0 0 3 0x14200 tmoslp softclockmp
45108 165226 0 0 3 0x40014200 tmoslp softclock
42412 229966 0 0 3 0x40014200 idle0
1 143670 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 27822 (syz-executor) thread 0xffff80003c3b6558 (449835)
exclusive rwlock vmmaplk r = 0 (0xfffff5006cbee6d0)
#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 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880
#3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693
#4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
Process 78613 (syz-executor) thread 0xffff800045fee018 (310499)
exclusive rwlock fdlock r = 0 (0xffff80003b7abb40)
#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_write+0x419 sys/kern/kern_rwlock.c:320
#2 ptmioctl+0x13c sys/kern/tty_pty.c:1094
#3 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264
#4 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:537
#5 sys_ioctl+0x674 sys/kern/sys_generic.c:-1
#6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
#7 Xsyscall+0x128
Process 86586 (syz-executor) thread 0xffff800045fefca0 (379098)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83acc800)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
#2 malloc+0xe3 sys/kern/kern_malloc.c:175
#3 sys_shmat+0x9f sys/kern/sysv_shm.c:-1
#4 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#4 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#5 Xsyscall+0x128
Process 15789 (systqmp) thread 0xffff800045ffe298 (249342)
shared rwlock systqmp r = 0 (0xffffffff83944c58)
#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
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11056 12211K 12214K 166960K 12239 0
pcb 20 14K 16K 166960K 107 0
rtable 219 7K 7K 166960K 375 0
pf 32 17K 18K 166960K 50 0
ifaddr 39 6K 7K 166960K 47 0
ifgroup 51 2K 2K 166960K 62 0
sysctl 1 1K 9K 166960K 6 0
counters 68 36K 37K 166960K 74 0
ioctlops 0 0K 4K 166960K 1617 0
iov 0 0K 0K 166960K 1 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1416 89K 89K 166960K 1511 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 6 0K 0K 166960K 9 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 18 65K 89K 166960K 168 0
proc 72 115K 180K 166960K 564 0
subproc 67 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 1 0
in_multi 88 6K 7K 166960K 99 0
ether_multi 1 0K 0K 166960K 1 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 43 201K 201K 166960K 43 0
exec 0 0K 1K 166960K 395 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 236 161K 168K 166960K 3575 0
UVM aobj 3 2K 2K 166960K 3 0
pinsyscall 44 88K 103K 166960K 1358 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 25 1K 2K 166960K 30 0
temp 33 9114K 9121K 166960K 4197 0
kqueue 13 20K 24K 166960K 29 0
SYN cache 2 16K 16K 166960K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 28 0 0 1 0 1 1 0 8 0
rtpcb 120 42 0 38 1 0 1 1 0 8 0
rtentry 176 112 0 14 5 0 5 5 0 8 0
unpcb 144 54 0 37 1 0 1 1 0 8 0
syncache 336 4 0 4 1 1 0 1 0 8 0
tcpcb 736 14 0 10 1 0 1 1 0 8 0
arp 136 18 0 2 1 0 1 1 0 8 0
inpcb 328 226 0 216 12 0 12 12 0 8 10
nd6 152 23 0 3 1 0 1 1 0 8 0
kcovpl 48 8 0 1 1 0 1 1 0 8 0
ppxss 1192 1 0 1 1 0 1 1 0 8 1
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 17 0 0 1 0 1 1 0 8 0
pfstkey 128 17 0 0 1 0 1 1 0 8 0
pfstate 448 17 0 0 2 0 2 2 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 256 451 0 0 29 0 29 29 0 8 0
art_table 40 452 0 0 5 0 5 5 0 8 0
art_node 32 110 0 11 1 0 1 1 0 8 0
sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1
semapl 72 5 0 1 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 1623 0 155 92 0 92 92 0 8 0
ffsino 296 1623 0 155 114 0 114 114 0 8 0
nchpl 144 1863 0 159 64 0 64 64 0 8 0
vnodes 216 1854 0 0 103 0 103 103 0 8 0
namei 1024 5950 0 5950 3 1 2 2 0 8 2
percpumem 16 53 0 3 1 0 1 1 0 8 0
kstatmem 264 31 0 6 2 0 2 2 0 8 0
scsiplug 72 1 0 1 1 0 1 1 0 8 1
scxspl 216 6316 0 6316 4 3 1 3 1 8 1
plimitpl 152 33 0 16 1 0 1 1 0 8 0
sigapl 424 495 0 447 7 0 7 7 0 8 0
knotepl 120 295 0 0 9 0 9 9 0 8 0
kqueuepl 224 32 0 22 1 0 1 1 0 8 0
pipepl 344 129 0 102 3 0 3 3 0 8 0
fdescpl 528 479 0 447 3 0 3 3 0 8 0
filepl 160 2090 0 1879 18 0 18 18 0 8 8
lockfpl 104 14 0 12 1 0 1 1 0 8 0
lockfspl 48 8 0 6 1 0 1 1 0 8 0
sessionpl 144 25 0 17 1 0 1 1 0 8 0
pgrppl 48 34 0 18 1 0 1 1 0 8 0
ucredpl 104 116 0 103 1 0 1 1 0 8 0
zombiepl 144 472 0 470 2 1 1 1 0 8 0
processpl 1232 495 0 447 5 0 5 5 0 8 0
procpl 664 563 0 505 6 0 6 6 0 8 0
sockpl 752 322 0 291 18 1 17 17 0 8 13
mcl64k 65536 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 136 0 0 17 0 17 17 0 8 0
mcl2k 2048 24 0 0 3 0 3 3 0 8 0
mextrefs 64 20 0 0 1 0 1 1 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 218 0 0 14 0 14 14 0 8 0
bufpl 272 2322 0 105 148 0 148 148 0 8 0
anonpl 32 3726 0 0 31 0 31 31 0 247 0
amapchunkpl 152 9457 0 8990 21 0 21 21 0 158 1
amappl16 200 1623 0 1604 6 4 2 5 0 8 0
amappl15 192 8 0 8 1 1 0 1 0 8 0
amappl14 184 442 0 440 1 0 1 1 0 8 0
amappl13 176 128 0 114 1 0 1 1 0 8 0
amappl12 168 764 0 733 2 0 2 2 0 8 0
amappl11 160 8 0 8 1 1 0 1 0 8 0
amappl10 152 69 0 54 1 0 1 1 0 8 0
amappl9 144 278 0 278 1 1 0 1 0 8 0
amappl8 136 113 0 111 1 0 1 1 0 8 0
amappl7 128 152 0 138 1 0 1 1 0 8 0
amappl6 120 158 0 155 1 0 1 1 0 8 0
amappl5 112 103 0 93 1 0 1 1 0 8 0
amappl4 104 302 0 281 1 0 1 1 0 8 0
amappl3 96 1707 0 1596 4 0 4 4 0 8 0
amappl2 88 560 0 498 2 0 2 2 0 8 0
amappl1 80 10714 0 10084 16 1 15 15 0 8 0
amappl 88 2814 0 2656 4 0 4 4 0 92 0
uvmvnodes 80 102 0 0 3 0 3 3 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 18 0 17 1 0 1 1 0 8 0
aobjpl 72 3 0 0 1 0 1 1 0 8 0
uaddrrnd 24 479 0 447 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 479 0 447 1 0 1 1 0 8 0
vmmpekpl 168 5997 0 5956 2 0 2 2 0 8 0
vmmpepl 168 40150 0 38208 89 1 88 88 0 357 0
vmsppl 488 478 0 447 5 0 5 5 0 8 0
rwobjpl 80 14920 0 13853 25 0 25 25 0 8 1
pdppl 4096 965 0 894 103 22 81 83 0 8 10
pvpl 32 9803 0 0 81 1 80 80 0 265 0
pmappl 256 478 0 447 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 427 0 27 12 0 12 12 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff839c4ff0) 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
end of kernel
end trace frame: 0x7b8e089cb680, count: 12
ddb{0}> trace
x86_ipi_db(ffffffff839c4ff0) 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
end of kernel
end trace frame: 0x7b8e089cb680, count: -3
ddb{0}> machine ddbcpu 1
Stopped at sys_shmat+0x453: movq 0(%r15),%rdi
sys_shmat(ffff800045fefca0,ffff80003a3a3b70,ffff80003a3a3ac0) at sys_shmat+0x453 sys/kern/sysv_shm.c:290
syscall(ffff80003a3a3b70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003a3a3b70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f1222a96e0, count: 12
ddb{1}> trace
sys_shmat(ffff800045fefca0,ffff80003a3a3b70,ffff80003a3a3ac0) at sys_shmat+0x453 sys/kern/sysv_shm.c:290
syscall(ffff80003a3a3b70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003a3a3b70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f1222a96e0, count: -3