uvm_fault(0xfffff0006e84a010, 0x98, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81235a18 cs 8 rflags 10246 cr2 98 cpl 0 rsp ffff80003c3d8e20 gsbase 0xffff80002999dff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81235a18 Starting stack trace... panic(ffffffff834eb72c) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c3d8d70) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80002a223238,fffff0005ee90878,ffff80003c3d8f30) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2690 sys_futimens(ffff80002a223238,ffff80003c3d9080,ffff80003c3d8fd0) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2766 syscall(ffff80003c3d9080) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3d9080) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x344b0c2050, count: 250 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 83 -1036354560 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 363436 66606 0 0 0 0K syz-executor *488157 93975 0 0 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x74930c402220, count: 14 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(0xfffff0006e84a010, 0x98, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x74930c402220, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a229720 rbx 0 rdx 0 rcx 0xffff80002a223c98 rax 0x3c r8 0xffff80002a229650 r9 0x1 r10 0x672f61938d4170a9 r11 0xe2b72dd5c98ddb4b r12 0 r13 0 r14 0xffff80002a223c98 r15 0 rip 0xffffffff820d43ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a2296a0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=488157 pid=93975 tcnt=2 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800033f994e0,0xffff80002a223248 process=0xffff8000ffff39d0 user=0xffff80002a224000, vmspace=0xfffff0006e84a010 estcpu=36, cpticks=2, pctcpu=0.0, user=1, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 66606 363436 21410 0 7 0 syz-executor 66606 193359 21410 0 1 0x4000000 syz-executor *93975 488157 51423 0 7 0 syz-executor 93975 69190 51423 0 3 0x4000000 sbar syz-executor 67235 266659 1 0 3 0x80 nanoslp init 73234 320421 46370 0 2 0xc80 syz-executor 73234 43181 46370 0 3 0x4000080 fsleep syz-executor 73234 160170 46370 0 3 0x4000080 ttyout syz-executor 73234 508077 46370 0 3 0x4000080 fsleep syz-executor 85655 470805 19602 0 2 0xc80 syz-executor 85655 54416 19602 0 3 0x4000080 pppxread syz-executor 85655 507877 19602 0 3 0x4000080 fsleep syz-executor 18270 391307 96122 0 2 0xc81 syz-executor 18270 385220 96122 0 3 0x4000081 ttyout syz-executor 18270 325471 96122 0 3 0x4000081 fsleep syz-executor 18270 248033 96122 0 3 0x4000081 fsleep syz-executor 19602 254974 38121 0 2 0xc82 syz-executor 75140 400344 38121 0 2 0x2 syz-executor 74210 280509 38560 0 4 0x48000000 syz-executor 74210 320626 38560 0 4 0x4c000000 syz-executor 48484 117138 0 0 3 0x14280 nfsidl nfsio 66337 112800 0 0 3 0x14280 nfsidl nfsio 10343 273535 0 0 3 0x14280 nfsidl nfsio 97445 125718 0 0 3 0x14280 nfsidl nfsio 30374 67908 0 0 3 0x14280 nfsidl nfsio 55429 494504 0 0 3 0x14280 nfsidl nfsio 11975 224166 0 0 3 0x14280 nfsidl nfsio 68003 61791 0 0 3 0x14280 nfsidl nfsio 35099 331675 0 0 3 0x14280 nfsidl nfsio 65101 72723 0 0 3 0x14280 nfsidl nfsio 70927 29063 0 0 3 0x14280 nfsidl nfsio 45049 400414 0 0 3 0x14280 nfsidl nfsio 62736 30003 0 0 3 0x14280 nfsidl nfsio 36325 65627 0 0 3 0x14280 nfsidl nfsio 22170 94852 0 0 3 0x14280 nfsidl nfsio 72327 404235 0 0 3 0x14280 nfsidl nfsio 56330 359668 0 0 3 0x14280 nfsidl nfsio 17733 7172 0 0 3 0x14280 nfsidl nfsio 26496 502714 0 0 3 0x14280 nfsidl nfsio 84923 255157 0 0 3 0x14280 nfsidl nfsio 67673 489537 6967 0 3 0x100082 sbwait ndp 6967 180268 89594 0 3 0x10008a sigsusp sh 46370 197089 38121 0 2 0xc82 syz-executor 89594 296080 38121 0 3 0x82 wait syz-executor 51423 457817 38121 0 2 0xc82 syz-executor 21410 48540 38121 0 2 0xc82 syz-executor 96122 518281 38121 0 2 0xc82 syz-executor 38560 379212 38121 0 4 0x58000882 syz-executor 38121 500109 1 0 3 0x82 kqread syz-executor 69789 435043 0 0 2 0x14200 smr 77044 183390 0 0 2 0x14200 zerothread 2708 378897 0 0 3 0x14200 aiodoned aiodoned 97622 13238 0 0 3 0x14200 syncer update 92758 163429 0 0 3 0x14200 cleaner cleaner 87183 291060 0 0 3 0x14200 reaper reaper 50352 367366 0 0 3 0x14200 pgdaemon pagedaemon 31091 326302 0 0 3 0x14200 bored viomb 25422 110636 0 0 3 0x40014200 acpi0 acpi0 99158 235212 0 0 3 0x40014200 idle1 4610 434520 0 0 3 0x14200 bored softnet1 88749 182265 0 0 2 0x14200 softnet0 63649 474849 0 0 3 0x14200 smrbar systqmp 29334 330195 0 0 3 0x14200 bored systq 72683 159706 0 0 2 0x14200 softclockmp 71627 175067 0 0 2 0x40014200 softclock 10364 93697 0 0 3 0x40014200 idle0 1 263868 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 66606 (syz-executor) thread 0xffff80002a223a00 (363436) exclusive rwlock amaplstlk r = 0 (0xffffffff8398ad68) #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 amap_alloc+0xeb amap_list_insert sys/uvm/uvm_amap.c:87 [inline] #2 amap_alloc+0xeb sys/uvm/uvm_amap.c:417 #3 amap_copy+0x6ac sys/uvm/uvm_amap.c:569 #4 uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747 #5 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #7 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #8 recall_trap+0x8 exclusive rwlock vmmaplk r = 0 (0xfffff0006e84a2f8) #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 93975 (syz-executor) thread 0xffff80002a223238 (69190) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83b2df00) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 Process 75140 (syz-executor) thread 0xffff80003c3f54e8 (400344) exclusive rrwlock inode r = 0 (0xfffff0006c879438) #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 (0xfffff0006bf65568) #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 63649 (systqmp) thread 0xffff8000ffffe298 (474849) shared rwlock systqmp r = 0 (0xffffffff839d03c8) #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 11059 12104K 12372K 166960K 13297 0 pcb 18 15K 16K 166960K 179 0 rtable 241 9K 9K 166960K 572 0 pf 170 27K 27K 166960K 465 0 ifaddr 41 7K 8K 166960K 83 0 ifgroup 55 2K 2K 166960K 128 0 sysctl 4 1K 9K 166960K 11 0 counters 70 37K 37K 166960K 208 0 ioctlops 0 0K 4K 166960K 1851 0 iov 1 0K 16K 166960K 35 0 mount 1 1K 1K 166960K 1 0 log 1 0K 0K 166960K 5 0 vnodes 1412 89K 89K 166960K 2126 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 15 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 45 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 65K 244K 166960K 765 0 sigio 0 0K 0K 166960K 11 0 proc 12 17K 164K 166960K 653 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 101 0 in_multi 91 6K 7K 166960K 145 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 22 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 482 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 136 80K 179K 166960K 8736 0 UVM aobj 13 2K 2K 166960K 13 0 pinsyscall 20 40K 104K 166960K 2005 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 20 0 NDP 12 0K 2K 166960K 56 0 temp 59 9119K 9195K 166960K 20349 0 kqueue 1 2K 26K 166960K 131 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 115 0 114 2 1 1 2 0 8 0 rtentry 176 155 0 52 6 1 5 6 0 8 0 unpcb 144 416 0 414 4 2 2 4 0 8 1 syncache 336 6 0 6 2 1 1 1 0 8 1 tcpcb 736 250 0 248 10 6 4 7 0 8 3 arp 136 26 0 7 1 0 1 1 0 8 0 inpcb 328 791 0 786 14 10 4 12 0 8 2 nd6 152 34 0 13 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 59 0 59 1 0 1 1 0 8 1 pppxif 1576 36 0 36 2 1 1 1 0 8 1 pfstscr 40 11 0 9 1 0 1 1 0 8 0 pffrag 232 6 0 1 1 0 1 1 0 482 0 pffrnode 88 6 0 1 1 0 1 1 0 8 0 pffrent 40 8 0 3 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 4 0 4 1 1 0 1 0 8 0 pfanchor 1288 52 0 2 5 0 5 5 0 8 0 pftag 88 5 0 2 2 1 1 1 0 8 0 pfstitem 24 78 0 7 1 0 1 1 0 8 0 pfstkey 128 86 0 15 3 0 3 3 0 8 0 pfstate 448 78 0 11 8 0 8 8 0 8 0 pfrule 1360 31 0 27 2 1 1 2 0 8 0 rttmr 136 3 0 3 2 1 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 659 0 202 33 3 30 30 0 8 0 art_table 40 662 0 202 5 0 5 5 0 8 0 art_node 32 155 0 61 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 5 1 0 1 1 0 8 0 semapl 72 42 0 32 1 0 1 1 0 8 0 shmpl 112 10 0 0 1 0 1 1 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 2736 0 1263 93 0 93 93 0 8 0 ffsino 296 2736 0 1263 114 0 114 114 0 8 0 nchpl 144 3724 0 2009 64 0 64 64 0 8 0 rtmask 32 6 0 6 1 0 1 1 0 8 1 vnodes 216 3299 0 0 184 0 184 184 0 8 0 namei 1024 13174 0 13173 2 0 2 2 0 8 1 percpumem 16 119 0 69 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 1 1 1 0 1 0 8 0 kstatmem 264 73 0 46 4 1 3 3 0 8 1 scsiplug 72 6 0 6 1 0 1 1 0 8 1 scxspl 216 13989 0 13989 10 9 1 8 1 8 1 plimitpl 152 215 0 205 1 0 1 1 0 8 0 sigapl 424 1099 0 1043 8 0 8 8 0 8 0 knotepl 120 317 0 0 10 0 10 10 0 8 0 kqueuepl 224 296 0 295 6 0 6 6 0 8 5 pipepl 344 167 0 140 3 0 3 3 0 8 0 fdescpl 528 1062 0 1042 3 0 3 3 0 8 0 filepl 160 6253 0 6023 16 2 14 16 0 8 3 lockfpl 104 371 0 371 1 0 1 1 0 8 1 lockfspl 48 157 0 157 1 0 1 1 0 8 1 sessionpl 144 41 0 38 1 0 1 1 0 8 0 pgrppl 48 58 0 47 1 0 1 1 0 8 0 ucredpl 104 1044 0 1041 1 0 1 1 0 8 0 zombiepl 144 1043 0 1043 1 0 1 1 0 8 1 processpl 1232 1099 0 1043 6 0 6 6 0 8 0 procpl 664 2140 0 2073 8 0 8 8 0 8 0 sosppl 176 3 0 3 2 1 1 1 0 8 1 sockpl 752 1346 0 1338 20 12 8 20 0 8 6 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 128 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 28 0 0 4 0 4 4 0 8 0 mtagpl 96 13 0 0 1 0 1 1 0 8 0 mbufpl 256 3021 0 0 189 0 189 189 0 8 0 bufpl 280 5449 0 107 382 0 382 382 0 8 0 anonpl 32 7698 0 0 63 0 63 63 0 246 0 amapchunkpl 152 27880 0 27538 30 3 27 28 0 158 10 amappl16 200 2414 0 2395 18 8 10 15 0 8 8 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 461 0 460 1 0 1 1 0 8 0 amappl13 176 134 0 133 1 0 1 1 0 8 0 amappl12 168 1326 0 1308 2 0 2 2 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 64 0 63 1 0 1 1 0 8 0 amappl9 144 279 0 278 2 1 1 1 0 8 0 amappl8 136 109 0 109 1 0 1 1 0 8 1 amappl7 128 157 0 154 1 0 1 1 0 8 0 amappl6 120 173 0 172 1 0 1 1 0 8 0 amappl5 112 103 0 103 1 0 1 1 0 8 1 amappl4 104 320 0 316 1 0 1 1 0 8 0 amappl3 96 5634 0 5556 4 0 4 4 0 8 0 amappl2 88 603 0 592 2 0 2 2 0 8 0 amappl1 80 13739 0 13619 17 2 15 17 0 8 8 amappl 88 7761 0 7643 5 0 5 5 0 92 0 uvmvnodes 80 127 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 dma512 512 1 0 1 1 0 1 1 0 8 1 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 255 0 255 2 2 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 1 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 12 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1062 0 1042 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1062 0 1042 1 0 1 1 0 8 0 vmmpekpl 168 10483 0 10438 3 0 3 3 0 8 0 vmmpepl 168 74651 0 73809 99 1 98 99 0 357 49 vmsppl 488 1061 0 1042 5 0 5 5 0 8 0 rwobjpl 80 22372 0 21916 28 0 28 28 0 8 5 pdppl 4096 2131 0 2084 102 51 51 81 0 8 4 pvpl 32 14419 0 0 117 0 117 117 0 265 0 pmappl 256 1061 0 1042 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 478 0 64 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83976ff0) 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 sched_choosecpu_fork(ffff80002a223a00,0) at sched_choosecpu_fork+0x18d cpuset_intersection sys/kern/kern_sched.c:806 [inline] sched_choosecpu_fork(ffff80002a223a00,0) at sched_choosecpu_fork+0x18d sys/kern/kern_sched.c:406 thread_fork(ffff80002a223a00,6ea2acc8d40,6ea01a6c600,6ea01a6c630,ffff80002a36eda0) at thread_fork+0x56d fork_thread_start sys/kern/kern_fork.c:343 [inline] thread_fork(ffff80002a223a00,6ea2acc8d40,6ea01a6c600,6ea01a6c630,ffff80002a36eda0) at thread_fork+0x56d sys/kern/kern_fork.c:622 sys___tfork(ffff80002a223a00,ffff80002a36ee50,ffff80002a36eda0) at sys___tfork+0x1b6 sys/kern/kern_fork.c:141 syscall(ffff80002a36ee50) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a36ee50) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7931d58a3020, count: 7 ddb{0}> trace x86_ipi_db(ffffffff83976ff0) 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 sched_choosecpu_fork(ffff80002a223a00,0) at sched_choosecpu_fork+0x18d cpuset_intersection sys/kern/kern_sched.c:806 [inline] sched_choosecpu_fork(ffff80002a223a00,0) at sched_choosecpu_fork+0x18d sys/kern/kern_sched.c:406 thread_fork(ffff80002a223a00,6ea2acc8d40,6ea01a6c600,6ea01a6c630,ffff80002a36eda0) at thread_fork+0x56d fork_thread_start sys/kern/kern_fork.c:343 [inline] thread_fork(ffff80002a223a00,6ea2acc8d40,6ea01a6c600,6ea01a6c630,ffff80002a36eda0) at thread_fork+0x56d sys/kern/kern_fork.c:622 sys___tfork(ffff80002a223a00,ffff80002a36ee50,ffff80002a36eda0) at sys___tfork+0x1b6 sys/kern/kern_fork.c:141 syscall(ffff80002a36ee50) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a36ee50) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7931d58a3020, count: -8 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x74930c402220, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x74930c402220, count: -1 ddb{1}>