uvm_fault(0xfffffd805e3a49b0, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81047658 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff800031bce750 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81047658 Starting stack trace... panic(ffffffff833e5c81) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff800031bce6a0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001650000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(21e5f,81,2000,ffff800039ff0a88) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff800039ff0a88) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff800031bce850) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8065d78d90,81,fffffd80097fd6e8,ffff800039ff0a88) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ba727d0,ffff800039ff0a88) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ba727d0,ffff800039ff0a88) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806ba727d0,ffff800039ff0a88) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806ba727d0,ffff800039ff0a88) at closef+0x192 sys/kern/kern_descrip.c:1264 syscall(ffff800031bceab0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800031bceab0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd473e444710, count: 245 End of stack trace. WA RNING: SPL NOT LOWERED ON SYSCALL 49 0 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *284131 40003 0 0 0x4000000 1 syz-executor 457068 1995 0 0x2 0 0 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0xc88f1b95b80, 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}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd805e3a49b0, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xc88f1b95b80, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a322c00 rbx 0 rdx 0xffff800001637180 rcx 0xffff800039ff0558 rax 0x32 r8 0xffff80002a322b30 r9 0x1 r10 0xf5d4176532d088aa r11 0xbd954c1c838a9c42 r12 0 r13 0 r14 0xffff800039ff0558 r15 0 rip 0xffffffff81b193ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a322b80 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=284131 pid=40003 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=86, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800039ff14e8,0xffff800039ff1cc0 process=0xffff80003c4321d8 user=0xffff80002a31d000, vmspace=0xfffffd806c9367b8 estcpu=34, cpticks=2, pctcpu=0.1, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 608 216388 15774 0 2 0 syz-executor 59821 385255 78474 0 2 0 syz-executor 39191 155968 13481 0 2 0 syz-executor 39191 150575 13481 0 3 0x4000000 sbar syz-executor 39191 262179 13481 0 3 0x4000080 fsleep syz-executor 91341 339225 4330 0 2 0 syz-executor 91341 310640 4330 0 3 0x4000000 smrbar syz-executor 91341 154082 4330 0 2 0x4000000 syz-executor 91341 186442 4330 0 3 0x4000080 fsleep syz-executor 40003 387084 55217 0 2 0 syz-executor 40003 439674 55217 0 2 0x4000000 syz-executor 40003 16656 55217 0 3 0x4000080 fsleep syz-executor *40003 284131 55217 0 7 0x4000000 syz-executor 45459 273206 1995 0 2 0 syz-executor 45459 50383 1995 0 2 0x4000000 syz-executor 45459 402839 1995 0 3 0x4000080 fsleep syz-executor 55217 307491 96478 0 2 0xc82 syz-executor 31389 452114 96478 0 2 0xc82 syz-executor 49672 268450 96478 0 2 0xc82 syz-executor 15774 111528 96478 0 2 0x2 syz-executor 39418 217164 0 0 3 0x14280 nfsidl nfsio 41935 111280 0 0 3 0x14280 nfsidl nfsio 8495 412931 0 0 3 0x14280 nfsidl nfsio 35132 80185 0 0 3 0x14280 nfsidl nfsio 71231 203846 0 0 3 0x14280 nfsidl nfsio 29300 275465 0 0 3 0x14280 nfsidl nfsio 28128 308088 0 0 3 0x14280 nfsidl nfsio 4134 486598 0 0 3 0x14280 nfsidl nfsio 16903 444776 0 0 3 0x14280 nfsidl nfsio 20546 445744 0 0 3 0x14280 nfsidl nfsio 74902 12904 0 0 3 0x14280 nfsidl nfsio 14924 465609 0 0 3 0x14280 nfsidl nfsio 11475 121123 0 0 3 0x14280 nfsidl nfsio 31427 331068 0 0 3 0x14280 nfsidl nfsio 33481 64950 0 0 3 0x14280 nfsidl nfsio 48808 342700 0 0 3 0x14280 nfsidl nfsio 73525 247428 0 0 3 0x14280 nfsidl nfsio 52763 69039 0 0 3 0x14280 nfsidl nfsio 42834 229685 0 0 3 0x14280 nfsidl nfsio 30243 283179 0 0 3 0x14280 nfsidl nfsio 78474 343663 96478 0 2 0xc82 syz-executor 1995 457068 96478 0 7 0x2 syz-executor 28112 311277 1 0 2 0x100083 getty 4330 505801 96478 0 2 0xc82 syz-executor 13481 308957 96478 0 2 0xc82 syz-executor 96478 464231 19994 0 3 0x82 kqread syz-executor 19994 223377 94764 0 3 0x10008a sigsusp ksh 94764 130685 24063 0 3 0x98 kqread sshd-session 24063 76028 47460 0 3 0x92 kqread sshd-session 47460 348466 1 0 3 0x88 kqread sshd 38381 31781 14405 74 3 0x1100092 bpf pflogd 14405 56078 1 0 3 0x80 sbwait pflogd 13923 509247 2290 73 3 0x1100090 kqread syslogd 2290 227099 1 0 3 0x100082 sbwait syslogd 11056 22318 1 0 3 0x100080 kqread resolvd 56248 1227 33178 77 3 0x100092 kqread dhcpleased 39723 58758 33178 77 3 0x100092 kqread dhcpleased 33178 21043 1 0 3 0x80 kqread dhcpleased 47395 167407 0 0 2 0x14200 smr 88715 11445 0 0 2 0x14200 zerothread 64383 298967 0 0 3 0x14200 aiodoned aiodoned 94143 163190 0 0 3 0x14200 syncer update 39989 84505 0 0 3 0x14200 cleaner cleaner 70149 351459 0 0 3 0x14200 reaper reaper 83472 352566 0 0 3 0x14200 pgdaemon pagedaemon 75493 84098 0 0 3 0x14200 bored viomb 47735 155226 0 0 3 0x40014200 acpi0 acpi0 23366 323571 0 0 3 0x40014200 idle1 45757 95949 0 0 3 0x14200 bored softnet1 29862 418130 0 0 2 0x14200 softnet0 43698 431116 0 0 2 0x14200 systqmp 33143 182875 0 0 3 0x14200 bored systq 74514 434564 0 0 3 0x14200 tmoslp softclockmp 76706 81149 0 0 3 0x40014200 tmoslp softclock 39922 232080 0 0 3 0x40014200 idle0 1 305434 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 39191 (syz-executor) thread 0xffff800039ff0a88 (150575) exclusive rwlock dtlk r = 0 (0xffffffff837b5ec8) #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 dt_ioctl_record_stop+0x2e sys/dev/dt/dt_dev.c:572 #3 dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #3 dtclose+0x109 sys/dev/dt/dt_dev.c:239 #4 spec_close+0x466 sys/kern/spec_vnops.c:-1 #5 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #6 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #6 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #7 fdrop+0x121 sys/kern/kern_descrip.c:1280 #8 closef+0x192 sys/kern/kern_descrip.c:1264 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #10 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838e6f08) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:608 #2 fdrop+0x121 sys/kern/kern_descrip.c:1280 #3 closef+0x192 sys/kern/kern_descrip.c:1264 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #5 Xsyscall+0x128 Process 40003 (syz-executor) thread 0xffff80003c41b790 (439674) exclusive rrwlock inode r = 0 (0xfffffd806f0e16e0) #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:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11103 12225K 12766K 166960K 17414 0 pcb 17 16K 23K 166960K 833 0 rtable 231 13K 14K 166960K 1157 0 pf 43 19K 21K 166960K 332 0 ifaddr 40 7K 8K 166960K 238 0 ifgroup 65 2K 3K 166960K 429 0 sysctl 4 1K 9K 166960K 22 0 counters 76 37K 38K 166960K 462 0 ioctlops 0 0K 4K 166960K 2211 0 iov 0 0K 24K 166960K 155 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1500 94K 95K 166960K 4419 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 10K 166960K 30 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 140 0 dirhash 12 2K 2K 166960K 45 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 236K 166960K 2761 0 sigio 0 0K 0K 166960K 134 0 proc 74 115K 164K 166960K 1138 0 subproc 72 4K 4K 166960K 180 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 357 0 in_multi 74 5K 7K 166960K 360 0 ether_multi 1 0K 0K 166960K 42 0 mrt 1 0K 0K 166960K 26 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 1031 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 276 154K 170K 166960K 25865 0 UVM aobj 59 14K 16K 166960K 70 0 pinsyscall 43 86K 102K 166960K 4183 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 162 0 NDP 17 0K 2K 166960K 170 0 temp 80 8680K 8754K 166960K 108414 0 kqueue 15 24K 30K 166960K 483 0 SYN cache 2 8K 16K 166960K 3 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 120 235 0 232 1 0 1 1 0 8 0 rtentry 176 385 0 302 6 0 6 6 0 8 2 unpcb 144 1931 0 1912 18 14 4 6 0 8 3 syncache 336 11 0 11 3 2 1 1 0 8 1 tcpqe 32 5 0 5 2 2 0 1 0 8 0 tcpcb 736 967 0 959 30 28 2 7 0 8 0 arp 136 50 0 33 1 0 1 1 0 8 0 inpcb 328 3120 0 3109 35 28 7 13 0 8 5 nd6 152 64 0 46 1 0 1 1 0 8 0 pkpcb 40 20 0 20 5 4 1 1 0 8 1 kcovpl 48 20 0 12 1 0 1 1 0 8 0 ppxss 1192 143 0 142 3 2 1 1 0 8 0 pppxif 1504 31 0 31 3 2 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 68 0 57 1 0 1 1 0 482 0 pffrnode 88 30 0 22 1 0 1 1 0 8 0 pffrent 40 196 0 184 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 2 0 2 1 0 1 1 0 8 1 pfstitem 24 205 0 67 1 0 1 1 0 8 0 pfstkey 128 211 0 73 5 0 5 5 0 8 0 pfstate 448 206 0 70 16 0 16 16 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 rttmr 136 3 0 3 2 2 0 1 0 8 0 art_heap8 4096 38 0 33 38 33 5 36 0 8 0 art_heap4 256 1586 0 1242 41 16 25 30 0 8 2 art_table 40 1624 0 1275 6 0 6 6 0 8 1 art_node 32 382 0 311 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 8 1 0 1 1 0 8 0 semapl 112 132 0 122 1 0 1 1 0 8 0 shmpl 112 55 0 5 2 0 2 2 0 8 0 dirhash 1024 39 0 22 3 0 3 3 0 8 0 dino2pl 256 6483 0 4952 96 0 96 96 0 8 0 ffsino 296 6483 0 4952 118 0 118 118 0 8 0 nchpl 144 10066 0 8334 65 0 65 65 0 8 0 rtmask 32 30 0 30 4 4 0 1 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 36908 0 36908 3 2 1 2 0 8 1 percpumem 16 246 0 193 1 0 1 1 0 8 0 vcpupl 3968 8 0 2 1 0 1 1 0 8 0 vmpool 848 12 0 6 1 0 1 1 0 8 0 kstatmem 264 260 0 224 3 0 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 15 0 15 5 4 1 1 0 8 1 scxspl 216 74047 0 74047 15 14 1 8 1 8 1 plimitpl 152 601 0 582 1 0 1 1 0 8 0 sigapl 424 3042 0 2974 8 0 8 8 0 8 0 knotepl 120 747 0 0 21 0 21 21 0 8 0 kqueuepl 224 1071 0 1059 9 7 2 5 0 8 1 pipepl 344 423 0 396 6 3 3 6 0 8 0 fdescpl 528 3000 0 2968 3 0 3 3 0 8 0 filepl 160 21475 0 21250 35 21 14 19 0 8 1 lockfpl 104 1018 0 1016 2 1 1 2 0 8 0 lockfspl 48 426 0 424 1 0 1 1 0 8 0 sessionpl 144 38 0 29 1 0 1 1 0 8 0 pgrppl 48 115 0 98 1 0 1 1 0 8 0 ucredpl 104 3330 0 3317 1 0 1 1 0 8 0 zombiepl 144 2976 0 2974 1 0 1 1 0 8 0 processpl 1232 3042 0 2974 8 2 6 6 0 8 0 procpl 664 7294 0 7216 8 0 8 8 0 8 0 sosppl 176 15 0 15 3 2 1 1 0 8 1 sockpl 752 5401 0 5367 53 42 11 21 0 8 7 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 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 62 0 0 5 0 5 5 0 8 0 mtagpl 96 96 0 0 3 0 3 3 0 8 0 mbufpl 256 1161 0 0 73 0 73 73 0 8 0 bufpl 280 30909 0 24773 439 0 439 439 0 8 0 anonpl 32 20656 0 0 166 0 166 166 0 246 0 amapchunkpl 152 87847 0 86938 56 18 38 38 0 158 3 amappl16 200 11144 0 10805 103 58 45 45 0 8 15 amappl15 192 38 0 37 1 0 1 1 0 8 0 amappl14 184 3 0 3 1 1 0 1 0 8 0 amappl13 176 570 0 568 1 0 1 1 0 8 0 amappl12 168 3461 0 3418 3 0 3 3 0 8 0 amappl11 160 9 0 8 1 0 1 1 0 8 0 amappl10 152 49 0 35 1 0 1 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 29 0 26 1 0 1 1 0 8 0 amappl7 128 132 0 129 1 0 1 1 0 8 0 amappl6 120 424 0 409 1 0 1 1 0 8 0 amappl5 112 80 0 69 1 0 1 1 0 8 0 amappl4 104 507 0 478 1 0 1 1 0 8 0 amappl3 96 18364 0 18242 4 0 4 4 0 8 0 amappl2 88 658 0 597 2 0 2 2 0 8 0 amappl1 80 21462 0 20866 16 2 14 15 0 8 0 amappl 88 24553 0 24352 5 0 5 5 0 92 0 uvmvnodes 80 180 0 0 4 0 4 4 0 8 0 dma16384 16384 1 0 1 1 0 1 1 0 8 1 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 258 0 258 5 4 1 1 0 8 1 dma64 64 9 0 9 3 3 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 69 0 11 2 0 2 2 0 8 0 uaddrrnd 24 3000 0 2968 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3000 0 2968 1 0 1 1 0 8 0 vmmpekpl 168 23466 0 23398 4 0 4 4 0 8 0 vmmpepl 168 194252 0 191938 158 34 124 124 0 357 11 vmsppl 488 2999 0 2968 6 1 5 5 0 8 0 rwobjpl 80 51489 0 49965 45 3 42 42 0 8 2 pdppl 4096 6031 0 5954 129 50 79 81 0 8 2 pvpl 32 29558 0 0 237 0 237 237 0 265 0 pmappl 256 3011 0 2974 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 465 0 135 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83824ff0) 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(ffffffff838e6d00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c495b10,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80003c495ce0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c495ce0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x724b168b3d10, count: 6 ddb{0}> trace x86_ipi_db(ffffffff83824ff0) 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(ffffffff838e6d00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c495b10,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80003c495ce0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c495ce0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x724b168b3d10, count: -9 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0xc88f1b95b80, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xc88f1b95b80, count: -1