panic: kernel diagnostic assertion "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_sig.c", line 1602
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
205487 21944 0 0 0 1 syz-executor
*310057 81594 60929 0x40009010 0xc080000 0 syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834b7306) at panic+0x1e5 sys/kern/subr_prf.c:198
__assert(ffffffff834fa871,ffffffff83466a05,642,ffffffff83448f0b) at __assert+0x29 sys/kern/subr_prf.c:-1
process_stop(ffff8000fffe9358,8000000,1) at process_stop+0x3fe
cursig(ffff8000fffeed18,ffff80003c3fa6b8,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline]
cursig(ffff8000fffeed18,ffff80003c3fa6b8,0) at cursig+0x509 sys/kern/kern_sig.c:1445
userret(ffff8000fffeed18) at userret+0x203 sys/kern/kern_sig.c:2207
syscall(ffff80003c3fa7f0) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80003c3fa7f0) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe431c24e510, 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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: kernel diagnostic assertion "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_sig.c", line 1602
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834b7306) at panic+0x1e5 sys/kern/subr_prf.c:198
__assert(ffffffff834fa871,ffffffff83466a05,642,ffffffff83448f0b) at __assert+0x29 sys/kern/subr_prf.c:-1
process_stop(ffff8000fffe9358,8000000,1) at process_stop+0x3fe
cursig(ffff8000fffeed18,ffff80003c3fa6b8,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline]
cursig(ffff8000fffeed18,ffff80003c3fa6b8,0) at cursig+0x509 sys/kern/kern_sig.c:1445
userret(ffff8000fffeed18) at userret+0x203 sys/kern/kern_sig.c:2207
syscall(ffff80003c3fa7f0) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80003c3fa7f0) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe431c24e510, count: -8
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff80003c3fa4d0
rbx 0xffffffff838f3e07 cpu_info_full_primary+0x2e07
rdx 0
rcx 0xffff8000fffeed18
rax 0xffffffff838f2ff0 cpu_info_full_primary+0x1ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xa58b4e7a873b3766
r11 0x6ac3173b8507e11c
r12 0xffffffff838f3c08 cpu_info_full_primary+0x2c08
r13 0
r14 0
r15 0x1
rip 0xffffffff82602be5 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80003c3fa4c0
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=310057 pid=81594 tcnt=2 stat=onproc
flags process=40009010<SUGID,SINGLEEXIT,STOPPING,STOPPED> proc=c080000<SUSPSINGLE,THREAD,SUSPSIG>
runpri=57, usrpri=55, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0xffff8000fffefca8 scnt=1 ecnt=1
forw=0xffffffffffffffff, list=0xffff80003038a2c0,0xffff8000fffefcb8
process=0xffff8000fffe9358 user=0xffff80003c3f5000, vmspace=0xfffff8806c32a3f0
estcpu=5, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
42275 402300 41897 0 2 0 syz-executor
42275 445070 41897 0 2 0x4000000 syz-executor
42275 441481 41897 0 3 0x4000080 fsleep syz-executor
21944 205487 98014 0 7 0 syz-executor
21944 359449 98014 0 2 0x4000000 syz-executor
92605 246526 3960 0 2 0 syz-executor
53834 476921 86781 0 2 0 syz-executor
53834 210508 86781 0 3 0x4000080 fifow syz-executor
53834 344251 86781 0 3 0x4000080 fsleep syz-executor
10720 467219 71954 0 2 0xc80 syz-executor
10720 65786 71954 0 3 0x4000080 kqread syz-executor
10720 98773 71954 0 3 0x4000080 fsleep syz-executor
24377 125967 28095 60928 2 0xc90 syz-executor
24377 291069 28095 60928 3 0x4000090 netcon syz-executor
24377 67409 28095 60928 3 0x4000090 fsleep syz-executor
24377 179669 28095 60928 3 0x4000090 fsleep syz-executor
*81594 310057 52099 60929 7 0x4c089010 syz-executor
81594 323043 52099 60929 3 0x4400b010 suspend syz-executor
28095 243875 19736 0 2 0xc82 syz-executor
41897 141157 19736 0 2 0xc82 syz-executor
98014 454369 19736 0 3 0x82 nanoslp syz-executor
52099 469228 19736 0 3 0x82 wait syz-executor
4204 116864 19736 0 3 0x2 biowait syz-executor
3960 377896 19736 0 2 0xc82 syz-executor
86781 276020 19736 0 2 0x2 syz-executor
71954 97132 19736 0 2 0xc82 syz-executor
19736 269382 1 0 3 0x82 kqread syz-executor
71665 354053 1 74 3 0x1100092 bpf pflogd
15361 381239 1 73 3 0x1100090 kqread syslogd
51193 457225 0 0 3 0x14200 bored smr
29229 268747 0 0 2 0x14200 zerothread
50258 209794 0 0 3 0x14200 aiodoned aiodoned
61376 290673 0 0 3 0x14200 syncer update
42405 492576 0 0 3 0x14200 cleaner cleaner
58704 443342 0 0 3 0x14200 reaper reaper
77955 45888 0 0 3 0x14200 pgdaemon pagedaemon
66730 266637 0 0 3 0x14200 bored viomb
94180 261220 0 0 3 0x40014200 acpi0 acpi0
87857 233362 0 0 3 0x40014200 idle1
53341 163727 0 0 3 0x14200 bored softnet1
46034 312184 0 0 3 0x14200 bored softnet0
76017 231752 0 0 3 0x14200 smrbar systqmp
38958 161492 0 0 3 0x14200 bored systq
23310 463571 0 0 3 0x14200 tmoslp softclockmp
71634 78740 0 0 3 0x40014200 tmoslp softclock
73931 216750 0 0 3 0x40014200 idle0
1 114432 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &sched_lock r = 0 (0xffffffff83a737b0)
#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+0x4b4 sys/kern/kern_lock.c:487
#2 cursig+0x4ee sys/kern/kern_sig.c:1444
#3 userret+0x203 sys/kern/kern_sig.c:2207
#4 syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
#4 syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
#5 Xsyscall+0x128
exclusive mutex &pr->ps_mtx r = 0 (0xffff8000fffe9470)
#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+0x4b4 sys/kern/kern_lock.c:487
#2 cursig+0x4c2 sys/kern/kern_sig.c:1440
#3 userret+0x203 sys/kern/kern_sig.c:2207
#4 syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
#4 syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
#5 Xsyscall+0x128
Process 21944 (syz-executor) thread 0xffff8000fffee020 (205487)
shared rwlock uobjlk r = 0 (0xfffff8806d71e598)
#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 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1204
#3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334
#4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffff8806f35ce60)
#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 4204 (syz-executor) thread 0xffff8000ffffd4c8 (116864)
exclusive rrwlock inode r = 0 (0xfffff8806e5705b8)
#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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline]
#4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159
#5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232
#6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393
#7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
#8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
#9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3062
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffff8806ccfb1e0)
#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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576
#5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431
#6 namei+0x7c5 sys/kern/vfs_lookup.c:250
#7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3047
#8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#9 Xsyscall+0x128
Process 76017 (systqmp) thread 0xffff8000ffffe530 (231752)
shared rwlock systqmp r = 0 (0xffffffff839a5e98)
#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{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11088 12094K 12414K 166960K 12372 0
pcb 17 12K 12K 166960K 62 0
rtable 227 10K 11K 166960K 426 0
pf 42 19K 24K 166960K 97 0
ifaddr 40 6K 7K 166960K 56 0
ifgroup 59 2K 2K 166960K 85 0
sysctl 3 1K 9K 166960K 9 0
counters 72 37K 37K 166960K 92 0
ioctlops 0 0K 4K 166960K 1521 0
iov 0 0K 8K 166960K 8 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1288 81K 81K 166960K 1485 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 3 24K 28K 166960K 10 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 14 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 85K 166960K 315 0
sigio 0 0K 0K 166960K 7 0
proc 12 17K 164K 166960K 574 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 11 0
in_multi 85 6K 7K 166960K 104 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 9 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 229 1023K 1023K 166960K 229 0
exec 0 0K 1K 166960K 394 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 148 87K 167K 166960K 4729 0
UVM aobj 76 3K 3K 166960K 77 0
pinsyscall 21 42K 107K 166960K 1478 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 9 0
NDP 13 0K 2K 166960K 36 0
temp 74 9123K 9199K 166960K 15011 0
kqueue 4 6K 26K 166960K 55 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 44 0 44 1 0 1 1 0 8 1
rtentry 176 120 0 28 6 0 6 6 0 8 0
unpcb 144 127 0 118 1 0 1 1 0 8 0
syncache 336 4 0 4 1 0 1 1 0 8 1
tcpcb 736 33 0 31 1 0 1 1 0 8 0
arp 136 18 0 2 1 0 1 1 0 8 0
inpcb 328 192 0 188 2 0 2 2 0 8 0
nd6 152 28 0 3 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
ppxss 1192 7 0 7 1 0 1 1 0 8 1
pfstscr 40 2 0 0 1 0 1 1 0 8 0
pffrag 232 1 0 0 1 0 1 1 0 482 0
pffrnode 88 1 0 0 1 0 1 1 0 8 0
pffrent 40 1 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
pfrktable 1344 13 0 8 1 0 1 1 0 8 0
pfanchor 1288 2 0 1 1 0 1 1 0 8 0
pftag 88 4 0 2 1 0 1 1 0 8 0
pfstitem 24 21 0 0 1 0 1 1 0 8 0
pfstkey 128 21 0 0 1 0 1 1 0 8 0
pfstate 448 20 0 0 3 0 3 3 0 8 0
pfrule 1360 26 0 19 2 1 1 2 0 8 0
rttmr 136 1 0 1 1 0 1 1 0 8 1
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 554 0 109 29 0 29 29 0 8 1
art_table 40 556 0 109 5 0 5 5 0 8 0
art_node 32 119 0 34 1 0 1 1 0 8 0
sysvmsgpl 40 3 0 3 1 0 1 1 0 8 1
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 72 12 0 2 1 0 1 1 0 8 0
shmpl 112 74 0 1 3 0 3 3 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1890 0 427 93 0 93 93 0 8 0
ffsino 296 1890 0 427 114 0 114 114 0 8 0
nchpl 144 2352 0 644 64 0 64 64 0 8 0
vnodes 216 2045 0 0 114 0 114 114 0 8 0
namei 1024 7412 0 7411 1 0 1 1 0 8 0
percpumem 16 61 0 10 1 0 1 1 0 8 0
pfiaddrpl 120 4 0 2 1 0 1 1 0 8 0
kstatmem 264 45 0 14 3 0 3 3 0 8 0
scsiplug 72 3 0 3 1 0 1 1 0 8 1
scxspl 216 7867 0 7866 4 2 2 3 1 8 1
plimitpl 152 83 0 72 1 0 1 1 0 8 0
sigapl 424 634 0 598 8 1 7 7 0 8 1
knotepl 120 558 0 0 17 0 17 17 0 8 0
kqueuepl 224 68 0 65 1 0 1 1 0 8 0
pipepl 344 138 0 111 3 0 3 3 0 8 0
fdescpl 528 618 0 598 3 0 3 3 0 8 0
filepl 160 2824 0 2644 12 0 12 12 0 8 2
lockfpl 104 78 0 77 1 0 1 1 0 8 0
lockfspl 48 39 0 38 1 0 1 1 0 8 0
sessionpl 144 28 0 24 1 0 1 1 0 8 0
pgrppl 48 37 0 25 1 0 1 1 0 8 0
ucredpl 104 518 0 509 1 0 1 1 0 8 0
zombiepl 144 598 0 598 1 0 1 1 0 8 1
processpl 1232 634 0 598 5 0 5 5 0 8 1
procpl 664 928 0 880 7 1 6 6 0 8 1
sosppl 176 2 0 2 1 0 1 1 0 8 1
sockpl 752 365 0 352 5 0 5 5 0 8 3
mcl64k 65536 2 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 1 0 0 1 0 1 1 0 8 0
mcl4k 4096 122 0 0 16 0 16 16 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 19 0 0 3 0 3 3 0 8 0
mtagpl 96 4 0 0 1 0 1 1 0 8 0
mbufpl 256 132 0 0 9 0 9 9 0 8 0
bufpl 272 2725 0 106 175 0 175 175 0 8 0
anonpl 32 3778 0 0 31 0 31 31 0 246 0
amapchunkpl 152 13593 0 13216 21 0 21 21 0 158 4
amappl16 200 1945 0 1921 6 3 3 5 0 8 0
amappl15 192 3 0 3 1 1 0 1 0 8 0
amappl14 184 452 0 451 1 0 1 1 0 8 0
amappl13 176 125 0 123 1 0 1 1 0 8 0
amappl12 168 868 0 849 2 0 2 2 0 8 0
amappl11 160 27 0 27 1 1 0 1 0 8 0
amappl10 152 78 0 74 1 0 1 1 0 8 0
amappl9 144 295 0 295 1 1 0 1 0 8 0
amappl8 136 112 0 111 1 0 1 1 0 8 0
amappl7 128 151 0 147 1 0 1 1 0 8 0
amappl6 120 160 0 159 1 0 1 1 0 8 0
amappl5 112 100 0 98 1 0 1 1 0 8 0
amappl4 104 295 0 288 1 0 1 1 0 8 0
amappl3 96 2626 0 2545 4 0 4 4 0 8 1
amappl2 88 549 0 533 2 0 2 2 0 8 0
amappl1 80 11142 0 10989 15 0 15 15 0 8 3
amappl 88 3963 0 3837 4 0 4 4 0 92 0
uvmvnodes 80 106 0 0 3 0 3 3 0 8 0
dma32768 32768 1 0 1 1 0 1 1 0 8 1
dma16384 16384 1 0 1 1 0 1 1 0 8 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 76 0 1 2 0 2 2 0 8 0
uaddrrnd 24 618 0 598 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 618 0 598 1 0 1 1 0 8 0
vmmpekpl 168 6968 0 6931 3 0 3 3 0 8 0
vmmpepl 168 47897 0 46945 87 0 87 87 0 357 33
vmsppl 488 617 0 598 5 0 5 5 0 8 1
rwobjpl 80 16527 0 15971 24 0 24 24 0 8 2
pdppl 4096 1243 0 1196 99 48 51 83 0 8 4
pvpl 32 10936 0 0 89 0 89 89 0 265 0
pmappl 256 617 0 598 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 447 0 51 12 0 12 12 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834b7306) at panic+0x1e5 sys/kern/subr_prf.c:198
__assert(ffffffff834fa871,ffffffff83466a05,642,ffffffff83448f0b) at __assert+0x29 sys/kern/subr_prf.c:-1
process_stop(ffff8000fffe9358,8000000,1) at process_stop+0x3fe
cursig(ffff8000fffeed18,ffff80003c3fa6b8,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline]
cursig(ffff8000fffeed18,ffff80003c3fa6b8,0) at cursig+0x509 sys/kern/kern_sig.c:1445
userret(ffff8000fffeed18) at userret+0x203 sys/kern/kern_sig.c:2207
syscall(ffff80003c3fa7f0) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80003c3fa7f0) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe431c24e510, count: -8
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff80002999dff0) 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: 0x7dc43deea310, count: 12
ddb{1}> trace
x86_ipi_db(ffff80002999dff0) 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: 0x7dc43deea310, count: -3
ddb{1}>