panic: acquiring blockable sleep lock with spinlock or critical section held (rwlock) kmmaplk Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 82764 26986 0 0 0 1 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823cfbab) at panic+0x15e sys/kern/subr_prf.c:218 witness_checkorder(ffffffff82851e90,1,0) at witness_checkorder+0x1146 sys/kern/subr_witness.c:833 rw_enter_read(ffffffff82851e80) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:111 uvmfault_lookup(ffff80002117f678,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1537 uvm_fault_check(ffff80002117f678,ffff80002117f650,ffff80002117f6b0,2) at uvm_fault_check+0x3d sys/uvm/uvm_fault.c:514 uvm_fault(ffffffff82851e78,ffff8000254cf000,0,2) at uvm_fault+0xb5 sys/uvm/uvm_fault.c:932 kpageflttrap(ffff80002117f7e0,ffff8000254cffe8) at kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 kerntrap(ffff80002117f7e0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b memcpy() at memcpy+0x15 timeout_run(ffff8000212ab328) at timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline] timeout_run(ffff8000212ab328) at timeout_run+0xd6 sys/kern/kern_timeout.c:676 softclock_process_tick_timeout(ffff8000212ab328,0) at softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:752 end trace frame: 0xffff80002117fa20, count: 0 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 acquiring blockable sleep lock with spinlock or critical section held (rwlock) kmmaplk ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823cfbab) at panic+0x15e sys/kern/subr_prf.c:218 witness_checkorder(ffffffff82851e90,1,0) at witness_checkorder+0x1146 sys/kern/subr_witness.c:833 rw_enter_read(ffffffff82851e80) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:111 uvmfault_lookup(ffff80002117f678,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1537 uvm_fault_check(ffff80002117f678,ffff80002117f650,ffff80002117f6b0,2) at uvm_fault_check+0x3d sys/uvm/uvm_fault.c:514 uvm_fault(ffffffff82851e78,ffff8000254cf000,0,2) at uvm_fault+0xb5 sys/uvm/uvm_fault.c:932 kpageflttrap(ffff80002117f7e0,ffff8000254cffe8) at kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 kerntrap(ffff80002117f7e0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b memcpy() at memcpy+0x15 timeout_run(ffff8000212ab328) at timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline] timeout_run(ffff8000212ab328) at timeout_run+0xd6 sys/kern/kern_timeout.c:676 softclock_process_tick_timeout(ffff8000212ab328,0) at softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:752 softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f acpicpu_idle() at acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 sched_idle(ffffffff8276dff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -18 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002117f2a0 rbx 0xffff80002117f2b0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff814fc675 kprintf+0x145 r9 0x1 r10 0x5729d353e76bddca r11 0xf202bead20af36a1 r12 0x3000000008 r13 0xffff80002117f350 r14 0x100 r15 0x1 rip 0xffffffff8224b018 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002117f290 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (idle0) pid=8241 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=50, nice=20 forw=0x515b14ad08d31e1e, list=0xffff8000211797a0,0xffff800021178a90 process=0xffff8000ffffe9e0 user=0xffff80002117a000, vmspace=0xffffffff828f0040 estcpu=0, cpticks=22095, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 26986 82764 67601 0 7 0 syz-executor.1 67601 133310 3556 0 3 0x82 nanoslp syz-executor.1 68467 69158 3556 0 2 0x482 syz-executor.0 3556 385311 65965 0 3 0x82 thrsleep syz-fuzzer 3556 271139 65965 0 3 0x4000082 nanoslp syz-fuzzer 3556 209689 65965 0 3 0x4000082 kqread syz-fuzzer 3556 348575 65965 0 3 0x4000082 thrsleep syz-fuzzer 3556 515848 65965 0 3 0x4000082 thrsleep syz-fuzzer 3556 209673 65965 0 3 0x4000082 thrsleep syz-fuzzer 3556 432247 65965 0 3 0x4000082 thrsleep syz-fuzzer 3556 256898 65965 0 3 0x4000082 nanoslp syz-fuzzer 65965 320492 9943 0 3 0x10008a sigsusp ksh 9943 198105 69774 0 3 0x92 kqread sshd 92635 223844 1 0 3 0x100083 ttyin getty 69774 197102 1 0 3 0x80 kqread sshd 80791 96781 77818 74 3 0x100092 bpf pflogd 77818 39024 1 0 3 0x80 netio pflogd 35015 41433 970 73 3 0x100090 kqread syslogd 970 224318 1 0 3 0x100082 netio syslogd 78413 164871 1 77 3 0x100090 poll dhclient 4991 306727 1 0 3 0x80 poll dhclient 46038 355402 0 0 3 0x14200 bored smr 87465 441754 0 0 3 0x14200 pgzero zerothread 27844 195457 0 0 3 0x14200 aiodoned aiodoned 69605 387777 0 0 3 0x14200 syncer update 39298 71376 0 0 3 0x14200 cleaner cleaner 79664 294690 0 0 3 0x14200 reaper reaper 57429 434011 0 0 3 0x14200 pgdaemon pagedaemon 9424 157545 0 0 3 0x14200 bored crynlk 88485 101442 0 0 3 0x14200 bored crypto 68666 435167 0 0 3 0x14200 bored viomb 37551 371558 0 0 3 0x40014200 acpi0 acpi0 46416 96052 0 0 3 0x40014200 idle1 64193 347623 0 0 3 0x14200 bored softnet 44051 210346 0 0 3 0x14200 bored systqmp 78736 127874 0 0 3 0x14200 bored systq 63757 71884 0 0 3 0x40014200 bored softclock *95864 8241 0 0 7 0x40014200 idle0 1 353371 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/kcov.c:125 r = 0 (0xffffffff82762048) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 kcov_remote_leave+0x1f sys/dev/kcov.c:674 #4 timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline] #4 timeout_run+0xd6 sys/kern/kern_timeout.c:676 #5 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 #6 softclock+0x11a sys/kern/kern_timeout.c:752 #7 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 #8 Xsoftclock+0x1f #9 acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 #10 sched_idle+0x417 sys/kern/kern_sched.c:178 #11 proc_trampoline+0x1c shared mutex timeout r = 0 (0xffffffff82754fb0) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 timeout_run+0xb7 sys/kern/kern_timeout.c:670 #2 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 #3 softclock+0x11a sys/kern/kern_timeout.c:752 #4 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 #5 Xsoftclock+0x1f #6 acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 #7 sched_idle+0x417 sys/kern/kern_sched.c:178 #8 proc_trampoline+0x1c Process 95864 (idle0) thread 0xffff800021179500 (8241) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff828c1198) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 #2 Xsoftclock+0x1f #3 acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 #4 sched_idle+0x417 sys/kern/kern_sched.c:178 #5 proc_trampoline+0x1c exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/kcov.c:125 r = 0 (0xffffffff82762048) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 kcov_remote_leave+0x1f sys/dev/kcov.c:674 #4 timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline] #4 timeout_run+0xd6 sys/kern/kern_timeout.c:676 #5 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 #6 softclock+0x11a sys/kern/kern_timeout.c:752 #7 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 #8 Xsoftclock+0x1f #9 acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 #10 sched_idle+0x417 sys/kern/kern_sched.c:178 #11 proc_trampoline+0x1c shared mutex timeout r = 0 (0xffffffff82754fb0) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 timeout_run+0xb7 sys/kern/kern_timeout.c:670 #2 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 #3 softclock+0x11a sys/kern/kern_timeout.c:752 #4 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 #5 Xsoftclock+0x1f #6 acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 #7 sched_idle+0x417 sys/kern/kern_sched.c:178 #8 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9484 6416K 6424K 78643K 10602 0 pcb 13 8K 8K 78643K 13 0 rtable 105 3K 3K 78643K 199 0 ifaddr 44 10K 10K 78643K 45 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 4K 78643K 1473 0 mount 1 1K 1K 78643K 1 0 vnodes 1219 77K 77K 78643K 1246 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 3 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 36067 0 sigio 0 0K 0K 78643K 2 0 proc 59 63K 95K 78643K 447 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 33 2K 2K 78643K 33 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 31 148K 148K 78643K 31 0 exec 0 0K 2K 78643K 358 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 221 33K 33K 78643K 73194 0 UVM aobj 5 2K 2K 78643K 5 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 6 0K 0K 78643K 10 0 temp 67 3968K 4032K 78643K 74131 0 kqueue 5 8K 8K 78643K 12 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 120 19 0 17 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 46 0 36 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 2323 0 2323 2 2 0 2 0 8 0 tcpcb 736 10 0 6 1 0 1 1 0 8 0 inpcb 296 39 0 32 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 kcovpl 48 2 0 0 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 pfstitem 24 12 0 10 1 0 1 1 0 8 0 pfstkey 112 12 0 10 1 0 1 1 0 8 0 pfstate 328 12 0 10 1 0 1 1 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 188 0 0 12 0 12 12 0 8 0 art_table 32 189 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 37457 0 36053 88 0 88 88 0 8 0 ffsino 272 37457 0 36053 95 1 94 94 0 8 0 nchpl 144 73725 0 72120 60 0 60 60 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 148466 0 148466 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 216 221347 0 221347 9 8 1 8 0 8 1 plimitpl 152 15 0 7 1 0 1 1 0 8 0 sigapl 424 36283 0 36251 4 0 4 4 0 8 0 futexpl 56 128725 0 128725 1 0 1 1 0 8 1 knotepl 112 329900 0 329874 1 0 1 1 0 8 0 kqueuepl 168 34432 0 34428 1 0 1 1 0 8 0 pipepl 336 76 0 65 1 0 1 1 0 8 0 fdescpl 496 36267 0 36251 3 0 3 3 0 8 0 filepl 152 71644 0 71542 6 1 5 5 0 8 0 lockfpl 104 9 0 8 1 0 1 1 0 8 0 lockfspl 48 4 0 3 1 0 1 1 0 8 0 sessionpl 144 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 59 0 50 1 0 1 1 0 8 0 zombiepl 144 36251 0 36250 2 1 1 1 0 8 0 processpl 1072 36283 0 36250 3 0 3 3 0 8 0 procpl 672 72510 0 72470 5 1 4 4 0 8 0 sockpl 432 104 0 85 3 0 3 3 0 8 0 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 9 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 363 0 0 44 6 38 44 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 555 0 0 23 0 23 23 0 8 0 bufpl 280 39563 0 33316 447 0 447 447 0 8 0 anonpl 16 2110168 0 2075916 144 5 139 139 0 124 1 amapchunkpl 152 110277 0 109418 35 1 34 34 0 158 0 amappl16 192 87953 0 86677 67 2 65 65 0 8 1 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 25 0 19 1 0 1 1 0 8 0 amappl13 168 29 0 25 1 0 1 1 0 8 0 amappl12 160 10 0 8 2 1 1 1 0 8 0 amappl11 152 56 0 39 1 0 1 1 0 8 0 amappl10 144 18035 0 18029 1 0 1 1 0 8 0 amappl9 136 18397 0 18395 1 0 1 1 0 8 0 amappl8 128 185 0 130 2 0 2 2 0 8 0 amappl7 120 18265 0 18257 1 0 1 1 0 8 0 amappl6 112 18093 0 18080 1 0 1 1 0 8 0 amappl5 104 36414 0 36396 1 0 1 1 0 8 0 amappl4 96 282 0 253 1 0 1 1 0 8 0 amappl3 88 145 0 137 1 0 1 1 0 8 0 amappl2 80 289248 0 289183 3 0 3 3 0 8 0 amappl1 72 961905 0 961447 25 15 10 19 0 8 0 amappl 80 72859 0 72712 4 0 4 4 0 84 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 64 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 36267 0 36251 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 36267 0 36251 1 0 1 1 0 8 0 vmmpekpl 168 84481 0 84453 2 0 2 2 0 8 0 vmmpepl 168 4385995 0 4383429 189 69 120 161 0 357 3 vmsppl 368 36266 0 36251 2 0 2 2 0 8 0 pdppl 4096 72541 0 72502 65 24 41 45 0 8 2 pvpl 32 11360249 0 11322760 328 19 309 309 0 265 4 pmappl 232 36266 0 36251 2 1 1 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 345 0 35 10 0 10 10 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823cfbab) at panic+0x15e sys/kern/subr_prf.c:218 witness_checkorder(ffffffff82851e90,1,0) at witness_checkorder+0x1146 sys/kern/subr_witness.c:833 rw_enter_read(ffffffff82851e80) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:111 uvmfault_lookup(ffff80002117f678,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1537 uvm_fault_check(ffff80002117f678,ffff80002117f650,ffff80002117f6b0,2) at uvm_fault_check+0x3d sys/uvm/uvm_fault.c:514 uvm_fault(ffffffff82851e78,ffff8000254cf000,0,2) at uvm_fault+0xb5 sys/uvm/uvm_fault.c:932 kpageflttrap(ffff80002117f7e0,ffff8000254cffe8) at kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 kerntrap(ffff80002117f7e0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b memcpy() at memcpy+0x15 timeout_run(ffff8000212ab328) at timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline] timeout_run(ffff8000212ab328) at timeout_run+0xd6 sys/kern/kern_timeout.c:676 softclock_process_tick_timeout(ffff8000212ab328,0) at softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:752 softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f acpicpu_idle() at acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 sched_idle(ffffffff8276dff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -18 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d68ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff828c0f90) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828c0f90) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff8000222c17e0) at syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff8000222c17e0) at syscall+0x3fd sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd8430, count: 9 ddb{1}> trace x86_ipi_db(ffff800020d68ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff828c0f90) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828c0f90) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff8000222c17e0) at syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff8000222c17e0) at syscall+0x3fd sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd8430, count: -6