uvm_fault(0xfffffd806c6dd018, 0x98, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81261ff8 cs 8 rflags 10246 cr2 98 cpl 0 rsp ffff80003c439690 gsbase 0xffff8000299bdff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81261ff8 Starting stack trace... panic(ffffffff8347ddff) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c4395e0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80003c42f250,fffffd8079269870,ffff80003c4397c0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2771 sys_futimes(ffff80003c42f250,ffff80003c439910,ffff80003c439860) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2813 syscall(ffff80003c439910) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c439910) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x88112f41630, count: 250 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 83 -738285968 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *168116 64709 0 0 0x4000000 1 syz-executor 390549 64605 0 0x14000 0x40000200 0 softclock savectx() at savectx+0xae end of kernel end trace frame: 0x880a4bbccc0, 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(0xfffffd806c6dd018, 0x98, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x880a4bbccc0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c3d9da0 rbx 0 rdx 0 rcx 0xffff80003bbcdca8 rax 0x3b r8 0xffff80003c3d9cd0 r9 0x1 r10 0xee3f642417498e42 r11 0xee7e30a1559b0b38 r12 0 r13 0 r14 0xffff80003bbcdca8 r15 0 rip 0xffffffff815683ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c3d9d20 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=168116 pid=64709 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=76, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c42e2c0,0xffffffff839a7c88 process=0xffff80003c3f61d0 user=0xffff80003c3d4000, vmspace=0xfffffd806c6dd018 estcpu=26, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 58816 470286 81032 0 2 0 syz-executor 58816 16896 81032 0 3 0x4000080 fsleep syz-executor 64709 90998 95876 0 2 0 syz-executor 64709 455331 95876 0 3 0x4000000 sbar syz-executor *64709 168116 95876 0 7 0x4000000 syz-executor 68573 197147 67867 0 2 0 syz-executor 68573 300530 67867 0 3 0x4000080 fsleep syz-executor 74253 354939 16164 0 2 0xc80 syz-executor 74253 412027 16164 0 2 0x4000c80 syz-executor 74253 330137 16164 0 3 0x4000080 fsleep syz-executor 41755 163012 51620 0 2 0xc80 syz-executor 41755 304729 51620 0 3 0x4000080 lockf syz-executor 41755 452755 51620 0 3 0x4000080 fsleep syz-executor 18403 475101 77302 0 2 0x2 syz-executor 58247 129057 93233 0 3 0x100082 sbwait ndp 93233 325450 56901 0 3 0x10008a sigsusp sh 95876 82017 77302 0 2 0xc82 syz-executor 56901 495561 77302 0 3 0x82 wait syz-executor 51620 501211 77302 0 2 0xc82 syz-executor 67867 124636 77302 0 2 0xc82 syz-executor 16164 392924 77302 0 2 0xc82 syz-executor 32632 157269 77302 0 2 0x2 syz-executor 81032 392646 77302 0 2 0xc82 syz-executor 77302 367584 80959 0 3 0x82 kqread syz-executor 80959 239644 64444 0 3 0x10008a sigsusp ksh 64444 473719 86096 0 3 0x98 kqread sshd-session 86096 315572 4451 0 3 0x92 kqread sshd-session 83229 515601 1 0 3 0x100083 ttyopn getty 4451 144112 1 0 3 0x88 kqread sshd 45119 37438 27931 74 3 0x1100092 bpf pflogd 27931 92417 1 0 3 0x80 sbwait pflogd 17420 252123 78823 73 3 0x1100090 kqread syslogd 78823 400267 1 0 3 0x100082 sbwait syslogd 58489 295626 1 0 3 0x100080 kqread resolvd 36961 174395 53863 77 3 0x100092 kqread dhcpleased 11669 459573 53863 77 3 0x100092 kqread dhcpleased 53863 25094 1 0 3 0x80 kqread dhcpleased 31430 107862 0 0 3 0x14200 bored smr 15148 485562 0 0 2 0x14200 zerothread 25821 290261 0 0 3 0x14200 aiodoned aiodoned 89154 10308 0 0 2 0x14e00 update 74410 439103 0 0 3 0x14200 cleaner cleaner 70100 228237 0 0 3 0x14200 reaper reaper 70905 178311 0 0 3 0x14200 pgdaemon pagedaemon 74277 210284 0 0 3 0x14200 bored viomb 88119 318977 0 0 3 0x40014200 acpi0 acpi0 13406 194341 0 0 3 0x40014200 idle1 87617 53568 0 0 3 0x14200 bored softnet1 33988 51042 0 0 2 0x14200 softnet0 11532 517200 0 0 2 0x14200 systqmp 52851 402518 0 0 3 0x14200 bored systq 24651 453210 0 0 2 0x14200 softclockmp 64605 390549 0 0 7 0x40014200 softclock 5446 354595 0 0 3 0x40014200 idle0 1 173360 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 64709 (syz-executor) thread 0xffff80003c42f250 (455331) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8396e080) #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 18403 (syz-executor) thread 0xffff80003c42ea88 (475101) exclusive rrwlock inode r = 0 (0xfffffd80700f9368) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x98a sys/kern/vfs_lookup.c:567 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806ecf6c98) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x98a sys/kern/vfs_lookup.c:567 #10 namei+0x7ca sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #13 Xsyscall+0x128 Process 32632 (syz-executor) thread 0xffff8000ffffc2a0 (157269) exclusive rrwlock inode r = 0 (0xfffffd80700f9b80) #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:3143 #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 (0xfffffd806d4f78c8) #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+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3128 #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11061 12091K 12410K 166960K 12656 0 pcb 17 12K 12K 166960K 71 0 rtable 177 5K 7K 166960K 447 0 pf 32 17K 25K 166960K 142 0 ifaddr 34 5K 8K 166960K 58 0 ifgroup 47 2K 2K 166960K 73 0 sysctl 3 1K 9K 166960K 8 0 counters 66 36K 37K 166960K 82 0 ioctlops 0 0K 4K 166960K 1579 0 iov 0 0K 16K 166960K 13 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1379 87K 88K 166960K 1967 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 12 0K 0K 166960K 18 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 528 0 sigio 0 0K 0K 166960K 4 0 proc 73 131K 164K 166960K 609 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 53 0 in_multi 73 5K 7K 166960K 124 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 10 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 584 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 230 153K 171K 166960K 6736 0 UVM aobj 11 2K 2K 166960K 11 0 pinsyscall 43 86K 104K 166960K 1741 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 8 0 NDP 10 0K 2K 166960K 35 0 temp 52 9081K 9161K 166960K 23588 0 kqueue 13 20K 30K 166960K 84 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 58 0 54 1 0 1 1 0 8 0 rtentry 176 132 0 56 5 0 5 5 0 8 0 unpcb 144 290 0 272 2 0 2 2 0 8 1 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 97 0 92 1 0 1 1 0 8 0 arp 136 21 0 8 1 0 1 1 0 8 0 inpcb 328 335 0 326 2 0 2 2 0 8 0 nd6 152 29 0 9 1 0 1 1 0 8 0 pkpcb 40 5 0 5 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 3 0 3 2 1 1 1 0 8 1 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrag 232 5 0 1 1 0 1 1 0 482 0 pffrnode 88 5 0 1 1 0 1 1 0 8 0 pffrent 40 73 0 69 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 5 0 5 1 0 1 1 0 8 1 pfsrclim 320 2 0 2 1 0 1 1 0 8 1 pfanchor 1288 6 0 0 1 0 1 1 0 8 0 pftag 88 5 0 4 1 0 1 1 0 8 0 pfstitem 24 40 0 0 1 0 1 1 0 8 0 pfstkey 128 44 0 4 2 0 2 2 0 8 0 pfstate 448 41 0 2 5 0 5 5 0 8 0 pfrule 1360 42 0 37 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 572 0 238 31 1 30 31 0 8 4 art_table 40 574 0 238 5 0 5 5 0 8 0 art_node 32 131 0 63 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 3 1 0 1 1 0 8 0 semupl 112 2 0 2 2 1 1 1 0 8 1 semapl 112 15 0 5 1 0 1 1 0 8 0 shmpl 112 8 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2378 0 917 92 0 92 92 0 8 0 ffsino 296 2378 0 917 114 0 114 114 0 8 0 nchpl 144 3097 0 1395 64 0 64 64 0 8 0 vnodes 216 2824 0 0 157 0 157 157 0 8 0 namei 1024 10304 0 10303 2 1 1 2 0 8 0 percpumem 16 56 0 8 1 0 1 1 0 8 0 kstatmem 264 37 0 14 3 1 2 3 0 8 0 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 10172 0 10172 10 2 8 8 1 8 8 plimitpl 152 242 0 224 1 0 1 1 0 8 0 sigapl 424 852 0 805 7 1 6 7 0 8 0 knotepl 120 453 0 0 14 0 14 14 0 8 0 kqueuepl 224 141 0 132 3 0 3 3 0 8 2 pipepl 344 163 0 136 3 0 3 3 0 8 0 fdescpl 528 835 0 804 3 0 3 3 0 8 0 filepl 160 4502 0 4275 15 0 15 15 0 8 4 lockfpl 104 307 0 303 2 0 2 2 0 8 1 lockfspl 48 83 0 80 1 0 1 1 0 8 0 sessionpl 144 108 0 99 1 0 1 1 0 8 0 pgrppl 48 122 0 105 1 0 1 1 0 8 0 ucredpl 104 837 0 824 1 0 1 1 0 8 0 zombiepl 144 805 0 805 1 0 1 1 0 8 1 processpl 1232 852 0 805 5 0 5 5 0 8 0 procpl 664 1493 0 1438 6 0 6 6 0 8 0 sosppl 176 7 0 7 1 0 1 1 0 8 1 sockpl 752 700 0 669 6 0 6 6 0 8 2 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 0 16 16 0 8 0 mcl2k 2048 30 0 0 4 0 4 4 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 192 0 0 12 0 12 12 0 8 0 bufpl 280 3257 0 108 225 0 225 225 0 8 0 anonpl 32 7653 0 0 62 0 62 62 0 246 0 amapchunkpl 152 33814 0 33367 36 1 35 36 0 158 13 amappl16 200 3120 0 3092 24 9 15 15 0 8 11 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 450 0 448 1 0 1 1 0 8 0 amappl13 176 163 0 150 1 0 1 1 0 8 0 amappl12 168 1124 0 1094 2 0 2 2 0 8 0 amappl11 160 7 0 7 2 2 0 1 0 8 0 amappl10 152 63 0 49 1 0 1 1 0 8 0 amappl9 144 258 0 258 1 1 0 1 0 8 0 amappl8 136 112 0 110 1 0 1 1 0 8 0 amappl7 128 174 0 160 1 0 1 1 0 8 0 amappl6 120 176 0 174 1 0 1 1 0 8 0 amappl5 112 105 0 93 1 0 1 1 0 8 0 amappl4 104 314 0 294 1 0 1 1 0 8 0 amappl3 96 4144 0 4038 4 0 4 4 0 8 0 amappl2 88 585 0 522 2 0 2 2 0 8 0 amappl1 80 12234 0 11610 17 0 17 17 0 8 3 amappl 88 5906 0 5752 5 0 5 5 0 92 0 uvmvnodes 80 113 0 0 3 0 3 3 0 8 0 dma8192 8192 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 128 254 0 254 2 1 1 1 0 8 1 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 10 0 0 1 0 1 1 0 8 0 uaddrrnd 24 835 0 804 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 835 0 804 1 0 1 1 0 8 0 vmmpekpl 168 8709 0 8673 2 0 2 2 0 8 0 vmmpepl 168 62232 0 60345 99 0 99 99 0 357 6 vmsppl 488 834 0 804 5 0 5 5 0 8 0 rwobjpl 80 20314 0 19235 29 1 28 28 0 8 2 pdppl 4096 1677 0 1608 105 30 75 85 0 8 6 pvpl 32 14757 0 0 120 0 120 120 0 265 0 pmappl 256 834 0 804 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 286 0 36 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8395eff0) 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(ffffffff8396d880) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff8396d880) at __mp_lock+0x199 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff8396d880) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff8396d880) at __mp_lock+0x192 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff8396d880,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 softclock_thread_run(ffffffff838f4f38) at softclock_thread_run+0x79 sys/kern/kern_timeout.c:836 softclock_thread(ffff8000fffff4c0) at softclock_thread+0x10a sys/kern/kern_timeout.c:858 end trace frame: 0x0, count: 3 ddb{0}> trace x86_ipi_db(ffffffff8395eff0) 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(ffffffff8396d880) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff8396d880) at __mp_lock+0x199 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff8396d880) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff8396d880) at __mp_lock+0x192 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff8396d880,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 softclock_thread_run(ffffffff838f4f38) at softclock_thread_run+0x79 sys/kern/kern_timeout.c:836 softclock_thread(ffff8000fffff4c0) at softclock_thread+0x10a sys/kern/kern_timeout.c:858 end trace frame: 0x0, count: -12 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x880a4bbccc0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x880a4bbccc0, count: -1