uvm_fault(0xffffffff83b00b90, 0xffff8537b101624d, 0, 1) -> e kernel: page fault trap, code=0 Stopped at malloc+0x855: movq 0x8(%rbx),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND 481941 33746 32767 0x10 0 1 syz-executor *363226 97524 0 0x2 0 0K syz-executor malloc(10,7f,1) at malloc+0x855 sys/kern/kern_malloc.c:294 spec_open_clone(ffff80002a2f9f78) at spec_open_clone+0x333 sys/kern/spec_vnops.c:-1 spec_open(ffff80002a2f9f78) at spec_open+0x319 sys/kern/spec_vnops.c:148 VOP_OPEN(ffffee806f7771b0,3,ffffee80097fd548,ffff800045fef770) at VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 vn_open(ffff80002a2fa1c8,3,0) at vn_open+0x7a5 sys/kern/vfs_vnops.c:183 doopenat(ffff800045fef770,ffffff9c,33bd783d53c,2,0,0,3c5506211146c129) at doopenat+0x35b sys/kern/vfs_syscalls.c:1163 sys_open(ffff800045fef770,ffff80002a2fa480,ffff80002a2fa3d0) at sys_open+0x59 sys/kern/vfs_syscalls.c:1065 syscall(ffff80002a2fa480) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2fa480) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x783774cb0c40, count: 6 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(0xffffffff83b00b90, 0xffff8537b101624d, 0, 1) -> e ddb{0}> show kasan No such command ddb{0}> trace malloc(10,7f,1) at malloc+0x855 sys/kern/kern_malloc.c:294 spec_open_clone(ffff80002a2f9f78) at spec_open_clone+0x333 sys/kern/spec_vnops.c:-1 spec_open(ffff80002a2f9f78) at spec_open+0x319 sys/kern/spec_vnops.c:148 VOP_OPEN(ffffee806f7771b0,3,ffffee80097fd548,ffff800045fef770) at VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 vn_open(ffff80002a2fa1c8,3,0) at vn_open+0x7a5 sys/kern/vfs_vnops.c:183 doopenat(ffff800045fef770,ffffff9c,33bd783d53c,2,0,0,3c5506211146c129) at doopenat+0x35b sys/kern/vfs_syscalls.c:1163 sys_open(ffff800045fef770,ffff80002a2fa480,ffff80002a2fa3d0) at sys_open+0x59 sys/kern/vfs_syscalls.c:1065 syscall(ffff80002a2fa480) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2fa480) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x783774cb0c40, count: -9 ddb{0}> show registers rdi 0x37788537b1006899 rsi 0xc887000000010adc rbp 0xffff80002a2f9e70 rbx 0xffff8537b1016245 rdx 0 rcx 0xffff800045fef770 rax 0xffffffff839afff0 cpu_info_full_primary+0x1ff0 r8 0x40 r9 0xffffffffffffffff r10 0xbc03c56c5fb0f339 r11 0x612e55f0df4be197 r12 0xc887000000010adc r13 0xffffffff83b19590 kmemstats+0x1fc0 r14 0xa30c333 __kernel_phys_end+0x670c333 r15 0x37788537b1006899 rip 0xffffffff83082105 malloc+0x855 cs 0x8 rflags 0x10282 __ALIGN_SIZE+0xf282 rsp 0xffff80002a2f9db0 ss 0x10 malloc+0x855: movq 0x8(%rbx),%r14 ddb{0}> show proc PROC (syz-executor) tid=363226 pid=97524 tcnt=1 stat=onproc flags process=2 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2227d8,0xffff80003c3e4a98 process=0xffff80003177fa38 user=0xffff80002a2f5000, vmspace=0xffffee80736a3b88 estcpu=36, cpticks=5, pctcpu=0.0, user=0, sys=4, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 33746 481941 20377 32767 7 0x10 0 syz-executor 33746 95415 20377 32767 3 0x10 0x4000080 nanoslp syz-executor *97524 363226 58048 0 7 0x2 0 syz-executor 96698 354116 96048 32767 3 0x10 0x80 nanoslp syz-executor 96698 253456 96048 32767 3 0x10 0x4000080 piperd syz-executor 96698 57427 96048 32767 3 0x10 0x4000080 fsleep syz-executor 81573 28884 54800 32767 2 0x10 0 syz-executor 81573 258689 54800 32767 3 0x10 0x4000080 fsleep syz-executor 81573 242767 54800 32767 3 0x10 0x4000080 pipewr syz-executor 54363 226319 46422 32767 3 0x10 0x80 nanoslp syz-executor 54363 105215 46422 32767 3 0x10 0x4000080 netcon syz-executor 54363 290181 46422 32767 3 0x10 0x4000080 fsleep syz-executor 54800 334165 33141 32767 3 0x10 0x80 nanoslp syz-executor 33141 158834 58048 0 3 0x2 0x80 wait syz-executor 99750 486457 58048 0 3 0x2 0x80 wait syz-executor 81117 275735 77179 32767 3 0x10 0x80 nanoslp syz-executor 77179 93702 58048 0 3 0x2 0x80 wait syz-executor 54492 256692 37926 32767 3 0x10 0x80 nanoslp syz-executor 20377 54412 24684 32767 3 0x10 0x80 nanoslp syz-executor 46422 78408 84164 32767 3 0x10 0x80 nanoslp syz-executor 96048 217503 24890 32767 3 0x10 0x80 nanoslp syz-executor 37926 389532 58048 0 3 0x2 0x80 wait syz-executor 24684 328290 58048 0 3 0x2 0x80 wait syz-executor 24890 478110 58048 0 3 0x2 0x80 wait syz-executor 84164 517128 58048 0 3 0x2 0x80 wait syz-executor 58048 126984 84786 0 3 0x2 0x80 kqread syz-executor 84786 379425 71259 0 3 0x100002 0x88 sigsusp ksh 71259 172603 78231 0 3 0x10 0x88 kqread sshd-session 78231 44431 95771 0 3 0x12 0x80 kqread sshd-session 20852 423168 1 0 3 0x100003 0x80 ttyin getty 95771 451519 1 0 3 0 0x88 kqread sshd 57800 214018 15375 73 3 0x1100010 0 ffs_fsync syslogd 15375 352410 1 0 3 0x100002 0x80 sbwait syslogd 20650 468383 1 0 3 0x100000 0x80 kqread resolvd 65069 452555 69994 77 3 0x100012 0x80 kqread dhcpleased 45631 462234 69994 77 3 0x100012 0x80 kqread dhcpleased 69994 289404 1 0 3 0 0x80 kqread dhcpleased 68825 64247 0 0 3 0x14000 0x200 bored smr 3730 344904 0 0 2 0x14000 0x200 zerothread 64945 257210 0 0 3 0x14000 0x200 aiodoned aiodoned 42581 290607 0 0 3 0x14000 0x200 syncer update 8711 117873 0 0 3 0x14000 0x200 cleaner cleaner 86700 273128 0 0 3 0x14000 0x200 reaper reaper 19439 307279 0 0 3 0x14000 0x200 pgdaemon pagedaemon 86476 78154 0 0 3 0x14000 0x200 bored viomb 13384 306294 0 0 3 0x14000 0x40000200 acpi0 acpi0 43685 349854 0 0 3 0x14000 0x40000200 idle1 61363 329419 0 0 3 0x14000 0x200 bored softnet1 76322 303705 0 0 3 0x14000 0x200 bored softnet0 64219 32789 0 0 3 0x14000 0x200 smrbar systqmp 94620 148391 0 0 3 0x14000 0x200 bored systq 74539 90022 0 0 3 0x14000 0x200 tmoslp softclockmp 55030 487342 0 0 3 0x14000 0x40000200 tmoslp softclock 37913 433589 0 0 3 0x14000 0x40000200 idle0 1 142972 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex /syzkaller/managers/setuid/kernel/sys/kern/kern_malloc.c:96 r = 0 (0xffffffff839da218) #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 malloc+0x2ef sys/kern/kern_malloc.c:200 #3 spec_open_clone+0x333 sys/kern/spec_vnops.c:-1 #4 spec_open+0x319 sys/kern/spec_vnops.c:148 #5 VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 #6 vn_open+0x7a5 sys/kern/vfs_vnops.c:183 #7 doopenat+0x35b sys/kern/vfs_syscalls.c:1163 #8 sys_open+0x59 sys/kern/vfs_syscalls.c:1065 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 #10 Xsyscall+0x128 Process 97524 (syz-executor) thread 0xffff800045fef770 (363226) exclusive rrwlock inode r = 0 (0xffffee806f774dc0) #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 spec_open_clone+0x290 sys/kern/spec_vnops.c:725 #6 spec_open+0x319 sys/kern/spec_vnops.c:148 #7 VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 #8 vn_open+0x7a5 sys/kern/vfs_vnops.c:183 #9 doopenat+0x35b sys/kern/vfs_syscalls.c:1163 #10 sys_open+0x59 sys/kern/vfs_syscalls.c:1065 #11 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 #12 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a03300) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 doopenat+0x340 sys/kern/vfs_syscalls.c:1163 #2 sys_open+0x59 sys/kern/vfs_syscalls.c:1065 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 exclusive mutex /syzkaller/managers/setuid/kernel/sys/kern/kern_malloc.c:96 r = 0 (0xffffffff839da218) #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 malloc+0x2ef sys/kern/kern_malloc.c:200 #3 spec_open_clone+0x333 sys/kern/spec_vnops.c:-1 #4 spec_open+0x319 sys/kern/spec_vnops.c:148 #5 VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 #6 vn_open+0x7a5 sys/kern/vfs_vnops.c:183 #7 doopenat+0x35b sys/kern/vfs_syscalls.c:1163 #8 sys_open+0x59 sys/kern/vfs_syscalls.c:1065 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 #10 Xsyscall+0x128 Process 57800 (syslogd) thread 0xffff80002a223c98 (214018) exclusive rrwlock inode r = 0 (0xffffee8072e47ed8) #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 sys_fsync+0x144 sys/kern/vfs_syscalls.c:2890 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #7 Xsyscall+0x128 Process 64219 (systqmp) thread 0xffff800045ffe530 (32789) shared rwlock systqmp r = 0 (0xffffffff83931398) #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 11074 12020K 12034K 166960K 12185 0 pcb 17 12K 12K 166960K 17 0 rtable 219 6K 7K 166960K 501 0 pf 29 16K 16K 166960K 41 0 ifaddr 38 6K 7K 166960K 66 0 ifgroup 46 2K 2K 166960K 70 0 sysctl 1 1K 9K 166960K 6 0 counters 68 36K 37K 166960K 80 0 ioctlops 0 0K 4K 166960K 36 0 iov 1 1K 4K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1438 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 10 1K 1K 166960K 10 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 23 85K 121K 166960K 294 0 sigio 0 0K 0K 166960K 1 0 proc 64 131K 147K 166960K 652 0 subproc 69 4K 4K 166960K 123 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 18 0 in_multi 88 5K 6K 166960K 161 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 223 996K 996K 166960K 223 0 exec 0 0K 1K 166960K 438 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 242 163K 196K 166960K 3882 0 UVM aobj 9 4K 6K 166960K 11 0 pinsyscall 44 88K 110K 166960K 1504 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 12 0K 2K 166960K 42 0 temp 38 9119K 9139K 166960K 4100 0 kqueue 13 20K 27K 166960K 40 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 43 0 40 1 0 1 1 0 8 0 rtentry 176 168 0 67 6 0 6 6 0 8 0 unpcb 144 81 0 65 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 31 0 25 1 0 1 1 0 8 0 arp 136 29 0 12 1 0 1 1 0 8 0 inpcb 328 300 0 290 7 0 7 7 0 8 5 nd6 152 40 0 18 1 0 1 1 0 8 0 kcovpl 48 13 0 6 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 692 0 220 33 0 33 33 0 8 0 art_table 40 693 0 220 6 0 6 6 0 8 0 art_node 32 168 0 66 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 6 1 0 1 1 0 8 1 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 72 8 0 0 1 0 1 1 0 8 0 shmpl 120 8 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1690 0 213 93 0 93 93 0 8 0 ffsino 296 1690 0 213 114 0 114 114 0 8 0 nchpl 144 1987 0 277 64 0 64 64 0 8 0 vnodes 216 1822 0 0 102 0 102 102 0 8 0 namei 1024 7619 0 7619 2 0 2 2 0 8 2 percpumem 16 56 0 6 1 0 1 1 0 8 0 kstatmem 264 35 0 12 2 0 2 2 0 8 0 scxspl 216 6621 0 6620 3 1 2 2 1 8 1 plimitpl 152 220 0 197 2 0 2 2 0 8 0 sigapl 424 573 0 522 7 0 7 7 0 8 0 knotepl 120 229 0 0 7 0 7 7 0 8 0 kqueuepl 224 45 0 36 1 0 1 1 0 8 0 pipepl 344 147 0 118 3 0 3 3 0 8 0 fdescpl 528 557 0 522 3 0 3 3 0 8 0 filepl 160 2573 0 2361 13 0 13 13 0 8 3 lockfpl 104 24 0 22 1 0 1 1 0 8 0 lockfspl 48 13 0 11 1 0 1 1 0 8 0 sessionpl 144 33 0 18 1 0 1 1 0 8 0 pgrppl 48 47 0 24 1 0 1 1 0 8 0 ucredpl 104 488 0 470 1 0 1 1 0 8 0 zombiepl 144 525 0 522 1 0 1 1 0 8 0 processpl 1240 573 0 522 5 0 5 5 0 8 0 procpl 664 707 0 649 6 0 6 6 0 8 0 sockpl 752 426 0 397 11 0 11 11 0 8 7 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mextrefs 64 18 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 221 0 0 14 0 14 14 0 8 0 bufpl 272 2318 0 102 148 0 148 148 0 8 0 anonpl 32 5350 0 0 44 0 44 44 0 247 0 amapchunkpl 152 11201 0 10654 30 0 30 30 0 158 6 amappl16 200 1631 0 1612 5 1 4 5 0 8 2 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 492 0 490 1 0 1 1 0 8 0 amappl13 176 157 0 146 1 0 1 1 0 8 0 amappl12 168 813 0 779 2 0 2 2 0 8 0 amappl11 160 88 0 88 1 1 0 1 0 8 0 amappl10 152 59 0 49 1 0 1 1 0 8 0 amappl9 144 270 0 270 1 1 0 1 0 8 0 amappl8 136 110 0 108 1 0 1 1 0 8 0 amappl7 128 147 0 136 1 0 1 1 0 8 0 amappl6 120 202 0 201 1 0 1 1 0 8 0 amappl5 112 98 0 91 1 0 1 1 0 8 0 amappl4 104 272 0 259 1 0 1 1 0 8 0 amappl3 96 1964 0 1860 4 1 3 3 0 8 0 amappl2 88 660 0 585 3 0 3 3 0 8 1 amappl1 80 11605 0 11044 16 0 16 16 0 8 2 amappl 88 3111 0 2932 5 0 5 5 0 92 0 uvmvnodes 80 104 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 10 0 2 1 0 1 1 0 8 0 uaddrrnd 24 557 0 522 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 557 0 522 1 0 1 1 0 8 0 vmmpekpl 168 6605 0 6557 3 0 3 3 0 8 0 vmmpepl 168 45284 0 43307 106 0 106 106 0 357 11 vmsppl 488 556 0 522 7 1 6 6 0 8 0 rwobjpl 80 16133 0 15188 25 0 25 25 0 8 4 pdppl 4096 1121 0 1044 107 18 89 95 0 8 12 pvpl 32 12609 0 0 103 1 102 102 0 265 0 pmappl 256 556 0 522 4 1 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 431 0 21 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace malloc(10,7f,1) at malloc+0x855 sys/kern/kern_malloc.c:294 spec_open_clone(ffff80002a2f9f78) at spec_open_clone+0x333 sys/kern/spec_vnops.c:-1 spec_open(ffff80002a2f9f78) at spec_open+0x319 sys/kern/spec_vnops.c:148 VOP_OPEN(ffffee806f7771b0,3,ffffee80097fd548,ffff800045fef770) at VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 vn_open(ffff80002a2fa1c8,3,0) at vn_open+0x7a5 sys/kern/vfs_vnops.c:183 doopenat(ffff800045fef770,ffffff9c,33bd783d53c,2,0,0,3c5506211146c129) at doopenat+0x35b sys/kern/vfs_syscalls.c:1163 sys_open(ffff800045fef770,ffff80002a2fa480,ffff80002a2fa3d0) at sys_open+0x59 sys/kern/vfs_syscalls.c:1065 syscall(ffff80002a2fa480) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2fa480) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x783774cb0c40, count: -9 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 __mp_lock(ffffffff83a02b00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a02b00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80003177a450) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003177a450) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x760bcf49d9a0, count: 9 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 __mp_lock(ffffffff83a02b00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a02b00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80003177a450) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003177a450) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x760bcf49d9a0, count: -6