uvm_fault(0xfffffd8070a96218, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81406498 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003c4516a0 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81406498 Starting stack trace... panic(ffffffff833e3d89) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c4515f0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000162a000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,1,2000,ffff80003b8054f8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,1,2000,ffff80003b8054f8) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c4517a0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8066633c28,1,fffffd80097fd4e0,ffff80003b8054f8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8068012238,ffff80003b8054f8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8068012238,ffff80003b8054f8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8068012238,ffff80003b8054f8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8068012238,ffff80003b8054f8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003b8054f8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003b8054f8,b,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003b8054f8,ffff80003c451b10,ffff80003c451a60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c451b10) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c451b10) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ebed9a3e630, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 20 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 54463 86598 0 0 0x1 0 syz-executor *420422 51084 0 0x10000002 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7bc91c0b6ce0, 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(0xfffffd8070a96218, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7bc91c0b6ce0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a3b0710 rbx 0 rdx 0 rcx 0xffff80003b804a98 rax 0x33 r8 0xffff80002a3b0640 r9 0x1 r10 0x50a96676a51189f7 r11 0xd0ce710378dd49ba r12 0 r13 0 r14 0xffff80003b804a98 r15 0 rip 0xffffffff821bb3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a3b0690 ss 0 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=420422 pid=51084 tcnt=1 stat=onproc flags process=10000002 proc=0 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffeb248,0xffff80003b8042e0 process=0xffff80003bc11d00 user=0xffff80002a3ab000, vmspace=0xfffffd8070a96ba0 estcpu=36, cpticks=112, pctcpu=0.31, user=9, sys=102, intr=1 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 86598 54463 3605 0 7 0x1 syz-executor 86598 322642 3605 0 3 0x4000080 fsleep syz-executor 86598 5807 3605 0 3 0x4000080 fsleep syz-executor 17813 502991 86718 0 2 0 syz-executor 17813 384199 86718 0 3 0x4000080 kqread syz-executor 17813 257965 86718 0 3 0x4000080 fsleep syz-executor 22109 103386 80078 0 3 0x80 nanoslp syz-executor 22109 384707 80078 0 3 0x4000080 ttyopn syz-executor 22109 89248 80078 0 3 0x4000080 fsleep syz-executor 55485 164013 94271 0 3 0x80 nanoslp syz-executor 55485 377965 94271 0 3 0x4000080 lockf syz-executor 55485 80547 94271 0 3 0x4000080 fsleep syz-executor 55485 470724 94271 0 3 0x4000080 fsleep syz-executor 86718 79909 55954 0 3 0x82 nanoslp syz-executor 41867 105151 1382 0 3 0x3000 suspend syz-executor 41867 187926 1382 0 3 0x4081000 biowait syz-executor 41867 389247 1382 0 3 0x4081000 inode syz-executor 41867 187786 1382 0 3 0x4081000 inode syz-executor 80078 317078 55954 0 3 0x82 nanoslp syz-executor 40998 222856 24754 0 3 0x3000 suspend syz-executor 40998 210711 24754 0 3 0x4081000 biowait syz-executor 40998 321805 24754 0 3 0x4081000 fltagain2 syz-executor 90923 301441 1 0 3 0x100083 ttyopn getty 98697 43961 0 0 3 0x14200 acct acct 89964 4666 55954 0 3 0x82 nanoslp syz-executor 99926 415534 23962 0 3 0x82 sbwait sshd-session *51084 420422 55954 0 7 0x10000002 syz-executor 24754 251037 55954 0 3 0x82 wait syz-executor 94271 464668 55954 0 3 0x82 nanoslp syz-executor 3605 293059 55954 0 3 0x82 nanoslp syz-executor 1382 119731 55954 0 3 0x82 nanoslp syz-executor 55954 251201 12732 0 3 0x82 kqread syz-executor 12732 68790 23397 0 3 0x10008a sigsusp ksh 23397 288330 61451 0 3 0x98 kqread sshd-session 61451 132033 23962 0 3 0x92 kqread sshd-session 23962 379040 1 0 3 0x88 kqread sshd 32155 175364 78382 74 3 0x1100092 bpf pflogd 78382 379218 1 0 3 0x80 sbwait pflogd 87141 407864 74489 73 3 0x1100090 kqread syslogd 74489 425272 1 0 3 0x100082 sbwait syslogd 78012 128029 1 0 3 0x100080 kqread resolvd 86809 348194 28814 77 3 0x100092 kqread dhcpleased 3385 401011 28814 77 3 0x100092 kqread dhcpleased 28814 350143 1 0 3 0x80 kqread dhcpleased 92441 48698 0 0 3 0x14200 bored smr 12997 445293 0 0 3 0x14200 pgzero zerothread 38035 279398 0 0 3 0x14200 aiodoned aiodoned 95144 384614 0 0 3 0x14200 syncer update 83436 192754 0 0 3 0x14200 cleaner cleaner 1020 71699 0 0 2 0x14200 reaper 84253 329959 0 0 3 0x14200 pgdaemon pagedaemon 9482 277689 0 0 3 0x14200 bored viomb 19513 33015 0 0 3 0x40014200 acpi0 acpi0 39344 55512 0 0 3 0x40014200 idle1 63832 489349 0 0 3 0x14200 bored softnet1 35234 294049 0 0 2 0x14200 softnet0 62105 244050 0 0 2 0x40014200 systqmp 27995 203934 0 0 3 0x14200 bored systq 6297 272874 0 0 3 0x14200 tmoslp softclockmp 76312 96653 0 0 3 0x40014200 tmoslp softclock 88505 220957 0 0 3 0x40014200 idle0 1 20642 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 41867 (syz-executor) thread 0xffff8000fffead18 (187926) exclusive rrwlock inode r = 0 (0xfffffd8061c9ced0) #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+0xa3 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 Process 41867 (syz-executor) thread 0xffff8000ffff27e0 (389247) exclusive rrwlock inode r = 0 (0xfffffd8061c9c7e0) #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+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domknodat+0xb4 sys/kern/vfs_syscalls.c:1592 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 40998 (syz-executor) thread 0xffff80003b804800 (210711) exclusive rrwlock inode r = 0 (0xfffffd806ea2acb0) #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+0xa3 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 Process 1020 (reaper) thread 0xffff8000ffffdc90 (71699) exclusive rwlock kmmaplk r = 0 (0xffffffff838d9b10) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171 #3 uvm_unmap+0x7d sys/uvm/uvm_map.c:1792 #4 km_free+0x87 sys/uvm/uvm_km.c:714 #5 uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304 #6 reaper+0x1aa sys/kern/kern_exit.c:493 #7 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10273 11255K 12481K 166960K 18070 0 pcb 19 16K 32K 166960K 1239 0 rtable 218 14K 16K 166960K 1114 0 pf 35 17K 81K 166960K 562 0 ifaddr 33 6K 8K 166960K 319 0 ifgroup 55 2K 3K 166960K 646 0 sysctl 4 1K 9K 166960K 35 0 counters 70 37K 38K 166960K 918 0 ioctlops 0 0K 5K 166960K 2954 0 iov 0 0K 40K 166960K 304 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1523 96K 96K 166960K 6518 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 6K 14K 166960K 59 0 VM map 2 1K 1K 166960K 2 0 sem 24 136K 137K 166960K 37 0 dirhash 87 15K 17K 166960K 3603 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 110K 166960K 4356 0 sigio 0 0K 0K 166960K 164 0 proc 74 115K 196K 166960K 1310 0 subproc 72 4K 4K 166960K 162 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 1136 0 in_multi 58 4K 7K 166960K 435 0 ether_multi 1 0K 0K 166960K 71 0 mrt 1 0K 0K 166960K 28 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 295 1314K 1314K 166960K 295 0 exec 0 0K 1K 166960K 1497 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 13 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 294 162K 184K 166960K 41514 0 UVM aobj 31 26K 26K 166960K 39 0 pinsyscall 44 88K 104K 166960K 5823 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 287 0 NDP 12 0K 2K 166960K 242 0 temp 94 8680K 8927K 166960K 217162 0 kqueue 14 22K 32K 166960K 865 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 120 462 0 458 4 3 1 3 0 8 0 rtentry 176 334 0 260 7 1 6 6 0 8 0 unpcb 144 4094 0 4075 24 22 2 6 0 8 1 syncache 336 23 0 23 8 7 1 1 0 8 1 tcpqe 32 5 0 5 3 2 1 1 0 8 1 tcpcb 736 1722 0 1714 37 30 7 7 0 8 6 arp 136 57 0 43 1 0 1 1 0 8 0 inpcb 328 5766 0 5752 43 36 7 15 0 8 5 nd6 152 62 0 44 1 0 1 1 0 8 0 pkpcb 40 27 0 27 8 8 0 1 0 8 0 kcovpl 48 18 0 10 1 0 1 1 0 8 0 mppekey 1024 72 0 72 3 3 0 1 0 8 0 ppxss 1192 346 0 346 2 1 1 1 0 8 1 pppxif 1504 168 0 168 8 8 0 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 27 0 21 1 0 1 1 0 482 0 pffrnode 88 21 0 15 1 0 1 1 0 8 0 pffrent 40 115 0 109 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 9 0 9 5 5 0 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 269 0 149 1 0 1 1 0 8 0 pfstkey 128 271 0 151 4 0 4 4 0 8 0 pfstate 448 270 0 150 14 0 14 14 0 8 0 pfrule 1344 33 0 27 2 1 1 2 0 8 0 rttmr 136 2 0 2 2 2 0 1 0 8 0 art_heap8 4096 5 0 0 5 0 5 5 0 8 0 art_heap4 256 1200 0 914 37 16 21 30 0 8 0 art_table 40 1205 0 914 5 0 5 5 0 8 0 art_node 32 331 0 267 1 0 1 1 0 8 0 sysvmsgpl 40 28 0 19 1 0 1 1 0 8 0 semupl 112 7 0 7 4 4 0 1 0 8 0 semapl 112 30 0 8 1 0 1 1 0 8 0 shmpl 112 21 0 5 1 0 1 1 0 8 0 dirhash 1024 1225 0 1183 7 1 6 6 0 8 0 dino2pl 256 10450 0 8923 96 0 96 96 0 8 0 ffsino 296 10450 0 8923 119 1 118 118 0 8 0 nchpl 144 16493 0 14757 65 0 65 65 0 8 0 rtmask 32 41 0 41 8 7 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 63198 0 63196 5 4 1 3 0 8 0 percpumem 16 474 0 424 1 0 1 1 0 8 0 vcpupl 3968 14 0 2 2 0 2 2 0 8 0 vmpool 840 15 0 3 2 0 2 2 0 8 0 kstatmem 264 414 0 386 6 3 3 3 0 8 1 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 24 0 24 5 4 1 1 0 8 1 scxspl 216 84914 0 84912 13 11 2 8 1 8 1 plimitpl 152 1472 0 1451 1 0 1 1 0 8 0 sigapl 424 4675 0 4625 9 2 7 8 0 8 0 knotepl 120 1190 0 0 36 0 36 36 0 8 0 kqueuepl 224 2177 0 2167 20 15 5 5 0 8 4 pipepl 344 774 0 745 15 11 4 6 0 8 1 fdescpl 528 4628 0 4596 3 0 3 3 0 8 0 filepl 160 38735 0 38488 45 31 14 21 0 8 1 lockfpl 104 2035 0 2029 3 2 1 2 0 8 0 lockfspl 48 839 0 834 1 0 1 1 0 8 0 sessionpl 144 53 0 43 1 0 1 1 0 8 0 pgrppl 48 132 0 114 1 0 1 1 0 8 0 ucredpl 104 8176 0 8163 1 0 1 1 0 8 0 zombiepl 144 6200 0 6196 1 0 1 1 0 8 0 processpl 1232 4675 0 4625 7 2 5 6 0 8 1 procpl 664 11939 0 11872 9 2 7 8 0 8 1 sosppl 176 28 0 28 7 6 1 1 0 8 1 sockpl 752 10553 0 10516 97 86 11 23 0 8 6 mcl64k 65536 10 0 0 2 0 2 2 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 100 0 0 9 1 8 9 0 8 0 mtagpl 96 58 0 0 2 0 2 2 0 8 0 mbufpl 256 1239 0 0 71 0 71 71 0 8 0 bufpl 280 34053 0 27917 439 0 439 439 0 8 0 anonpl 32 16617 0 0 136 2 134 134 0 246 0 amapchunkpl 152 144887 0 144175 75 42 33 38 0 158 1 amappl16 200 13569 0 13139 108 85 23 39 0 8 0 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 5 0 5 4 4 0 1 0 8 0 amappl13 176 547 0 546 1 0 1 1 0 8 0 amappl12 168 5111 0 5067 3 0 3 3 0 8 0 amappl11 160 8 0 6 1 0 1 1 0 8 0 amappl10 152 92 0 78 1 0 1 1 0 8 0 amappl9 144 272 0 272 1 1 0 1 0 8 0 amappl8 136 30 0 26 1 0 1 1 0 8 0 amappl7 128 151 0 149 1 0 1 1 0 8 0 amappl6 120 417 0 403 1 0 1 1 0 8 0 amappl5 112 93 0 81 1 0 1 1 0 8 0 amappl4 104 564 0 531 1 0 1 1 0 8 0 amappl3 96 30045 0 29915 5 1 4 4 0 8 0 amappl2 88 796 0 727 2 0 2 2 0 8 0 amappl1 80 32425 0 31762 16 0 16 16 0 8 0 amappl 88 39772 0 39562 5 0 5 5 0 92 0 uvmvnodes 80 212 0 0 5 0 5 5 0 8 0 dma65536 65536 2 0 2 2 2 0 1 0 8 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma4096 4096 4 0 4 2 2 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 9 0 9 4 4 0 1 0 8 0 dma128 128 260 0 260 7 6 1 1 0 8 1 dma64 64 9 0 9 3 2 1 1 0 8 1 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 38 0 8 1 0 1 1 0 8 0 uaddrrnd 24 4628 0 4596 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4628 0 4596 1 0 1 1 0 8 0 vmmpekpl 168 37350 0 37278 4 0 4 4 0 8 0 vmmpepl 168 299261 0 296744 162 50 112 125 0 357 0 vmsppl 488 4627 0 4596 7 2 5 5 0 8 0 rwobjpl 80 76353 0 74625 56 20 36 42 0 8 0 pdppl 4096 9293 0 9210 146 60 86 89 0 8 3 pvpl 32 24930 0 0 200 0 200 200 0 265 0 pmappl 256 4642 0 4599 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 472 0 132 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83879ff0) 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(ffffffff83a10328) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a10328) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff83a10328) at __mp_lock+0x19e __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a10328) at __mp_lock+0x19e sys/kern/kern_lock.c:165 intr_handler(ffff80002a3a6700,ffff80000006b400) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d malloc(30,7f,1) at malloc+0xb94 sys/kern/kern_malloc.c:350 ktrsyscall(ffff8000ffffc538,53,28,ffff80002a3a6ab0) at ktrsyscall+0x19a sys/kern/kern_ktrace.c:174 syscall(ffff80002a3a6ab0) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a3a6ab0) at syscall+0x304 sys/arch/amd64/amd64/trap.c:775 end trace frame: 0xffff80002a3a6b30, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83879ff0) 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(ffffffff83a10328) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a10328) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff83a10328) at __mp_lock+0x19e __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a10328) at __mp_lock+0x19e sys/kern/kern_lock.c:165 intr_handler(ffff80002a3a6700,ffff80000006b400) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d malloc(30,7f,1) at malloc+0xb94 sys/kern/kern_malloc.c:350 ktrsyscall(ffff8000ffffc538,53,28,ffff80002a3a6ab0) at ktrsyscall+0x19a sys/kern/kern_ktrace.c:174 syscall(ffff80002a3a6ab0) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a3a6ab0) at syscall+0x304 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7569847fb830, count: -15 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7bc91c0b6ce0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7bc91c0b6ce0, count: -1