panic: mtx 0xffffffff83a0e290: locking against myself Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 7216 79210 32767 0x10 0 1 syz-executor * 82044 47533 32767 0x10 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833e1a91) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83a0e290) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83a0e290) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80085d6fa8) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80085d6fa8) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80085d6fa8) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd8065e85768,1000,ffff8000373ec898,ffff8000373ec87c,0,2,b4f97e40df6c2cae,2) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000373ecab0,ffff8000373ecae8,ffff8000373ec930,ffff8000373ec918) at uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1651 uvm_fault_lower(ffff8000373ecab0,ffff8000373ecae8,ffff8000373eca30) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1418 uvm_fault(fffffd806c097b68,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000373ecc40,2000000011c0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000373ecc40) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f65af6d2bf0, count: 2 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 *cpu0: mtx 0xffffffff83a0e290: locking against myself ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833e1a91) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83a0e290) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83a0e290) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80085d6fa8) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80085d6fa8) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80085d6fa8) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd8065e85768,1000,ffff8000373ec898,ffff8000373ec87c,0,2,b4f97e40df6c2cae,2) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000373ecab0,ffff8000373ecae8,ffff8000373ec930,ffff8000373ec918) at uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1651 uvm_fault_lower(ffff8000373ecab0,ffff8000373ecae8,ffff8000373eca30) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1418 uvm_fault(fffffd806c097b68,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000373ecc40,2000000011c0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000373ecc40) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f65af6d2bf0, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000373ec5e0 rbx 0xffffffff83850dcf cpu_info_full_primary+0x2dcf rdx 0 rcx 0xffff8000fffe34a8 rax 0xffffffff8384fff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x15a972d2b6fc98a4 r11 0xcfc9476ae56c4a52 r12 0xffffffff83850bd0 cpu_info_full_primary+0x2bd0 r13 0 r14 0 r15 0x1 rip 0xffffffff812dbfb5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000373ec5d0 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=82044 pid=47533 tcnt=4 stat=onproc flags process=10 proc=0 runpri=36, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffe3c58,0xffff8000fffead00 process=0xffff8000fffe4970 user=0xffff8000373e7000, vmspace=0xfffffd806c097b68 estcpu=13, cpticks=2, pctcpu=0.0, user=2, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 79210 7216 28043 32767 7 0x10 syz-executor 79210 397986 28043 32767 2 0x4000010 syz-executor *47533 82044 35150 32767 7 0x10 syz-executor 47533 314888 35150 32767 3 0x4000090 fsleep syz-executor 47533 405805 35150 32767 3 0x4000010 biowait syz-executor 47533 221215 35150 32767 2 0x4000010 syz-executor 43902 88865 81491 32767 2 0x10 syz-executor 43902 523510 81491 32767 3 0x4000090 pipewr syz-executor 64173 317776 0 0 3 0x14200 bored sosplice 4565 453937 47823 32767 2 0x10 syz-executor 4565 345392 47823 32767 3 0x4000090 fsleep syz-executor 87237 97548 5489 32767 2 0x10 syz-executor 87237 509197 5489 32767 3 0x4000090 fsleep syz-executor 87237 459393 5489 32767 3 0x4000090 fsleep syz-executor 6864 246055 95015 32767 2 0x10 syz-executor 6864 447845 95015 32767 3 0x4000090 ttybg syz-executor 6864 439847 95015 32767 3 0x4000090 fsleep syz-executor 6864 79352 95015 32767 3 0x4000090 fsleep syz-executor 76404 97535 64390 32767 2 0x10 syz-executor 76404 461949 64390 32767 3 0x4000090 fsleep syz-executor 76404 517603 64390 32767 3 0x4000090 fsleep syz-executor 27190 294344 33294 32767 2 0x10 syz-executor 27190 281850 33294 32767 3 0x4000090 fsleep syz-executor 95015 258267 96621 32767 2 0x10 syz-executor 81491 449470 72679 32767 3 0x90 nanoslp syz-executor 33294 312134 29117 32767 3 0x90 nanoslp syz-executor 5489 42340 82424 32767 3 0x90 nanoslp syz-executor 35150 221572 17949 32767 3 0x90 nanoslp syz-executor 28043 124192 28047 32767 3 0x90 nanoslp syz-executor 64390 524263 6612 32767 2 0x10 syz-executor 47823 511482 82172 32767 3 0x90 nanoslp syz-executor 82424 185324 91094 0 3 0x82 wait syz-executor 6612 91766 91094 0 3 0x82 wait syz-executor 96621 324576 91094 0 3 0x82 wait syz-executor 82172 327731 91094 0 3 0x82 wait syz-executor 28047 20006 91094 0 3 0x82 wait syz-executor 72679 425473 91094 0 3 0x82 wait syz-executor 29117 293683 91094 0 3 0x82 wait syz-executor 17949 323523 91094 0 3 0x82 wait syz-executor 91094 343446 90459 0 3 0x82 kqread syz-executor 90459 407770 19547 0 3 0x10008a sigsusp ksh 19547 513699 52163 0 3 0x98 kqread sshd-session 52163 197691 43671 0 3 0x92 kqread sshd-session 92103 403952 1 0 3 0x100083 ttyin getty 43671 521306 1 0 3 0x88 kqread sshd 90507 398206 65470 73 3 0x1100090 kqread syslogd 65470 107670 1 0 3 0x100082 sbwait syslogd 48445 483316 1 0 3 0x100080 kqread resolvd 63250 453614 36239 77 3 0x100092 kqread dhcpleased 6147 375603 36239 77 3 0x100092 kqread dhcpleased 36239 422149 1 0 3 0x80 kqread dhcpleased 74851 368709 0 0 3 0x14200 bored smr 14735 450827 0 0 2 0x14200 zerothread 65037 297210 0 0 3 0x14200 aiodoned aiodoned 51133 420278 0 0 3 0x14200 syncer update 18291 167816 0 0 3 0x14200 cleaner cleaner 46956 301370 0 0 3 0x14200 reaper reaper 58907 306393 0 0 3 0x14200 pgdaemon pagedaemon 58712 171396 0 0 3 0x14200 bored viomb 22720 285141 0 0 3 0x40014200 acpi0 acpi0 8241 350028 0 0 3 0x40014200 idle1 9629 103645 0 0 3 0x14200 bored softnet3 44433 423889 0 0 3 0x14200 bored softnet2 29630 200549 0 0 3 0x14200 bored softnet1 38548 107230 0 0 3 0x14200 bored softnet0 13813 359263 0 0 3 0x14200 bored systqmp 67052 35272 0 0 3 0x14200 bored systq 16495 452848 0 0 3 0x14200 tmoslp softclockmp 42068 505623 0 0 3 0x40014200 tmoslp softclock 39496 452250 0 0 3 0x40014200 idle0 1 15226 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &uvm.pageqlock r = 0 (0xffffffff83a0e2a0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x178 sys/kern/kern_lock.c:-1 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 uvn_get+0x679 sys/uvm/uvm_vnode.c:1117 #4 uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1651 #5 uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1418 #6 uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 Process 47533 (syz-executor) thread 0xffff8000fffe34a8 (82044) exclusive rwlock uobjlk r = 0 (0xfffffd806bc53de0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 uvn_io+0x667 sys/uvm/uvm_vnode.c:1297 #3 uvn_get+0x31d sys/uvm/uvm_vnode.c:1102 #4 uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1651 #5 uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1418 #6 uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 exclusive mutex &uvm.pageqlock r = 0 (0xffffffff83a0e2a0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x178 sys/kern/kern_lock.c:-1 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 uvn_get+0x679 sys/uvm/uvm_vnode.c:1117 #4 uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1651 #5 uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1418 #6 uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 Process 47533 (syz-executor) thread 0xffff8000fffea540 (405805) exclusive rrwlock inode r = 0 (0xfffffd805fd61560) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 sys_ftruncate+0x1c4 sys/kern/vfs_syscalls.c:2912 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10184 10954K 10965K 166960K 11261 0 pcb 17 12K 12K 166960K 17 0 rtable 234 6K 6K 166960K 353 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 1K 166960K 1 0 counters 64 36K 36K 166960K 64 0 ioctlops 0 0K 2K 166960K 30 0 iov 0 0K 0K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1354 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 26 97K 129K 166960K 180 0 sigio 0 0K 0K 166960K 1 0 proc 58 79K 127K 166960K 473 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 8 0 in_multi 99 7K 7K 166960K 101 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 354 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 267 161K 170K 166960K 3169 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 47 94K 114K 166960K 1217 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 9 0 NDP 13 0K 2K 166960K 27 0 temp 34 8678K 8742K 166960K 3871 0 kqueue 13 20K 22K 166960K 33 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 42 0 39 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 63 0 46 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 808 25 0 20 1 0 1 1 0 8 0 arp 128 18 0 0 1 0 1 1 0 8 0 inpcb 384 101 0 87 2 0 2 2 0 8 0 nd6 144 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 453 0 0 29 0 29 29 0 8 0 art_table 32 454 0 0 4 0 4 4 0 8 0 art_node 16 110 0 10 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 1596 0 90 95 0 95 95 0 8 0 ffsino 288 1596 0 90 108 0 108 108 0 8 0 nchpl 144 1831 0 155 63 0 63 63 0 8 0 uvmvnodes 80 1677 0 0 35 0 35 35 0 8 0 vnodes 216 1677 0 0 94 0 94 94 0 8 0 namei 1024 5446 0 5446 2 0 2 2 0 8 2 percpumem 16 47 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 6191 0 6189 9 1 8 8 1 8 7 plimitpl 152 43 0 16 2 0 2 2 0 8 0 sigapl 424 464 0 407 8 0 8 8 0 8 1 futexpl 64 520 0 511 1 0 1 1 0 8 0 knotepl 120 317 0 0 10 0 10 10 0 8 0 kqueuepl 224 30 0 21 1 0 1 1 0 8 0 pipepl 336 102 0 74 3 0 3 3 0 8 0 fdescpl 520 445 0 407 4 0 4 4 0 8 0 filepl 160 1583 0 1356 10 0 10 10 0 8 0 lockfpl 104 21 0 16 1 0 1 1 0 8 0 lockfspl 48 12 0 7 1 0 1 1 0 8 0 sessionpl 144 22 0 6 1 0 1 1 0 8 0 pgrppl 48 30 0 6 1 0 1 1 0 8 0 ucredpl 104 138 0 119 1 0 1 1 0 8 0 zombiepl 144 407 0 407 1 0 1 1 0 8 1 processpl 1192 464 0 407 5 0 5 5 0 8 0 procpl 656 540 0 469 6 0 6 6 0 8 0 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 728 271 0 237 4 0 4 4 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 0 16 16 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 177 0 0 12 0 12 12 0 8 0 bufpl 280 2284 0 117 155 0 155 155 0 8 0 anonpl 32 5095 0 0 42 0 42 42 0 246 0 amapchunkpl 152 9250 0 8650 28 0 28 28 0 158 4 amappl16 200 2026 0 2001 5 0 5 5 0 8 3 amappl15 192 41 0 41 1 1 0 1 0 8 0 amappl14 184 109 0 99 1 0 1 1 0 8 0 amappl13 176 5 0 5 2 1 1 1 0 8 1 amappl12 168 1056 0 1018 2 0 2 2 0 8 0 amappl11 160 47 0 36 1 0 1 1 0 8 0 amappl10 152 16 0 16 1 0 1 1 0 8 1 amappl9 144 253 0 253 1 0 1 1 0 8 1 amappl8 136 18 0 17 1 0 1 1 0 8 0 amappl7 128 96 0 85 1 0 1 1 0 8 0 amappl6 120 173 0 170 1 0 1 1 0 8 0 amappl5 112 110 0 104 1 0 1 1 0 8 0 amappl4 104 289 0 275 1 0 1 1 0 8 0 amappl3 96 1454 0 1315 4 0 4 4 0 8 0 amappl2 88 616 0 563 2 0 2 2 0 8 0 amappl1 80 8257 0 7676 15 0 15 15 0 8 1 amappl 88 2510 0 2308 5 0 5 5 0 92 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 72 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 445 0 407 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 445 0 407 1 0 1 1 0 8 0 vmmpekpl 168 5249 0 5212 2 0 2 2 0 8 0 vmmpepl 168 35195 0 33012 98 0 98 98 0 357 2 vmsppl 480 444 0 407 7 1 6 6 0 8 1 rwobjpl 72 14272 0 11730 48 0 48 48 0 8 0 pdppl 4096 897 0 814 113 18 95 99 0 8 12 pvpl 32 11021 0 0 92 2 90 90 0 265 1 pmappl 256 444 0 407 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 396 0 21 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833e1a91) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83a0e290) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83a0e290) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80085d6fa8) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80085d6fa8) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80085d6fa8) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd8065e85768,1000,ffff8000373ec898,ffff8000373ec87c,0,2,b4f97e40df6c2cae,2) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000373ecab0,ffff8000373ecae8,ffff8000373ec930,ffff8000373ec918) at uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1651 uvm_fault_lower(ffff8000373ecab0,ffff8000373ecae8,ffff8000373eca30) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1418 uvm_fault(fffffd806c097b68,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000373ecc40,2000000011c0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000373ecc40) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f65af6d2bf0, count: -13 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) 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 end of kernel end trace frame: 0x7ed6776ceee0, count: 12 ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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 end of kernel end trace frame: 0x7ed6776ceee0, count: -3