panic: mtx 0xffffffff83a0e290: locking against myself Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *460600 90262 32767 0x10 0 0 syz-executor 454088 51388 32767 0x10 0 1 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(fffffd8008818700) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd8008818700) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd8008818700) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd806be45620,1000,ffff8000307eeba8,ffff8000307eeb8c,0,2,da2cad7728688215,2) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000307eedc0,ffff8000307eedf8,ffff8000307eec40,ffff8000307eec28) at uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1651 uvm_fault_lower(ffff8000307eedc0,ffff8000307eedf8,ffff8000307eed40) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1418 uvm_fault(fffffd806bdfa208,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000307eef50,200000001480) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000307eef50) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x78e62f6fa6e0, 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(fffffd8008818700) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd8008818700) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd8008818700) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd806be45620,1000,ffff8000307eeba8,ffff8000307eeb8c,0,2,da2cad7728688215,2) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000307eedc0,ffff8000307eedf8,ffff8000307eec40,ffff8000307eec28) at uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1651 uvm_fault_lower(ffff8000307eedc0,ffff8000307eedf8,ffff8000307eed40) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1418 uvm_fault(fffffd806bdfa208,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000307eef50,200000001480) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000307eef50) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x78e62f6fa6e0, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000307ee8f0 rbx 0xffffffff83850dcf cpu_info_full_primary+0x2dcf rdx 0 rcx 0xffff8000327fe028 rax 0xffffffff8384fff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x7199e493c466dd10 r11 0x1c182da545b4a847 r12 0xffffffff83850bd0 cpu_info_full_primary+0x2bd0 r13 0 r14 0 r15 0x1 rip 0xffffffff812dbfb5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000307ee8e0 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=460600 pid=90262 tcnt=3 stat=onproc flags process=10 proc=0 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a296018,0xffff8000327fe558 process=0xffff80003802eeb0 user=0xffff8000307ea000, vmspace=0xfffffd806bdfa208 estcpu=36, cpticks=2, pctcpu=0.0, user=1, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 64031 24321 71455 32767 2 0x10 syz-executor 64031 82446 71455 32767 3 0x4000090 sbwait syz-executor *90262 460600 12880 32767 7 0x10 syz-executor 90262 164229 12880 32767 3 0x4000010 biowait syz-executor 90262 326229 12880 32767 3 0x4000090 fsleep syz-executor 51388 454088 40338 32767 7 0x10 syz-executor 51388 188407 40338 32767 3 0x4000090 sbwait syz-executor 51388 2575 40338 32767 2 0x4000010 syz-executor 18801 453272 70474 32767 2 0x10 syz-executor 18801 71143 70474 32767 3 0x4000090 fsleep syz-executor 47005 133155 0 0 3 0x14200 bored sosplice 82010 514283 90632 32767 2 0x10 syz-executor 82010 178061 90632 32767 3 0x4000090 sbwait syz-executor 5794 494926 96258 32767 3 0x4000090 nanoslp syz-executor 5794 254616 96258 32767 3 0x4000090 lockf syz-executor 5794 220908 96258 32767 3 0x4000090 semwait syz-executor 5794 392040 96258 32767 3 0x4000090 fsleep syz-executor 29404 486940 73699 32767 3 0x90 nanoslp syz-executor 29404 177832 73699 32767 3 0x4000090 kqread syz-executor 71455 273213 28838 32767 3 0x90 nanoslp syz-executor 96258 223997 15900 32767 3 0x90 nanoslp syz-executor 70474 98532 38405 32767 3 0x90 nanoslp syz-executor 73699 296293 82504 32767 3 0x90 nanoslp syz-executor 12880 483045 30695 32767 3 0x90 nanoslp syz-executor 90632 92871 82231 32767 3 0x90 nanoslp syz-executor 40338 476524 46719 32767 3 0x90 nanoslp syz-executor 53770 154773 14365 32767 2 0x10 syz-executor 28838 408541 11779 0 3 0x82 wait syz-executor 15900 332310 11779 0 3 0x82 wait syz-executor 38405 71066 11779 0 3 0x82 wait syz-executor 82504 46575 11779 0 3 0x82 wait syz-executor 30695 153824 11779 0 3 0x82 wait syz-executor 46719 398347 11779 0 3 0x82 wait syz-executor 82231 166308 11779 0 3 0x82 wait syz-executor 14365 214685 11779 0 3 0x82 wait syz-executor 11779 488186 12006 0 3 0x82 kqread syz-executor 12006 355561 93722 0 3 0x10008a sigsusp ksh 93722 134564 51943 0 3 0x98 kqread sshd-session 51943 445030 98592 0 3 0x92 kqread sshd-session 87176 64445 1 0 3 0x100083 ttyin getty 98592 30354 1 0 3 0x88 kqread sshd 10786 469918 66879 73 3 0x1100090 kqread syslogd 66879 146385 1 0 3 0x100082 sbwait syslogd 93831 429899 1 0 3 0x100080 kqread resolvd 22419 34660 61886 77 3 0x100092 kqread dhcpleased 31233 285759 61886 77 3 0x100092 kqread dhcpleased 61886 11098 1 0 3 0x80 kqread dhcpleased 25641 65763 0 0 3 0x14200 bored smr 8038 165113 0 0 2 0x14200 zerothread 11728 481430 0 0 3 0x14200 aiodoned aiodoned 74671 185293 0 0 3 0x14200 syncer update 44493 159789 0 0 3 0x14200 cleaner cleaner 98890 313292 0 0 3 0x14200 reaper reaper 67737 283714 0 0 3 0x14200 pgdaemon pagedaemon 12937 491106 0 0 3 0x14200 bored viomb 21927 209729 0 0 3 0x40014200 acpi0 acpi0 24413 63888 0 0 3 0x40014200 idle1 11502 434063 0 0 3 0x14200 bored softnet3 61276 140070 0 0 3 0x14200 bored softnet2 25391 226344 0 0 3 0x14200 bored softnet1 48759 89355 0 0 3 0x14200 bored softnet0 77221 507075 0 0 3 0x14200 bored systqmp 4194 100583 0 0 3 0x14200 bored systq 23472 81025 0 0 3 0x14200 tmoslp softclockmp 37350 362666 0 0 3 0x40014200 tmoslp softclock 18478 18950 0 0 3 0x40014200 idle0 1 512614 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 90262 (syz-executor) thread 0xffff8000327fe028 (460600) exclusive rwlock uobjlk r = 0 (0xfffffd806bd352e8) #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 90262 (syz-executor) thread 0xffff8000327fe548 (164229) exclusive rrwlock inode r = 0 (0xfffffd806bdd3320) #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 10183 10954K 10965K 166960K 11260 0 pcb 17 12K 12K 166960K 17 0 rtable 236 6K 6K 166960K 346 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 29 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1351 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 25 93K 125K 166960K 165 0 proc 58 79K 140K 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 1 0K 0K 166960K 11 0 in_multi 101 7K 7K 166960K 104 0 ether_multi 2 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 55 254K 254K 166960K 55 0 exec 0 0K 1K 166960K 338 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 242 136K 144K 166960K 2958 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 46 92K 112K 166960K 1160 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 27 2K 2K 166960K 27 0 temp 34 8678K 8742K 166960K 3711 0 kqueue 13 20K 24K 166960K 29 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 34 0 30 1 0 1 1 0 8 0 rtentry 176 112 0 1 6 0 6 6 0 8 0 unpcb 144 45 0 22 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 808 24 0 16 2 0 2 2 0 8 0 arp 128 18 0 0 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 384 161 0 145 8 0 8 8 0 8 6 nd6 144 25 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 256 455 0 0 29 0 29 29 0 8 0 art_table 32 456 0 0 4 0 4 4 0 8 0 art_node 16 111 0 10 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 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 1572 0 66 95 0 95 95 0 8 0 ffsino 288 1572 0 66 108 0 108 108 0 8 0 nchpl 144 1786 0 106 63 0 63 63 0 8 0 uvmvnodes 80 1653 0 0 34 0 34 34 0 8 0 vnodes 216 1653 0 0 92 0 92 92 0 8 0 namei 1024 5370 0 5370 1 0 1 1 0 8 1 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 5751 0 5749 3 1 2 2 1 8 1 plimitpl 152 38 0 14 2 0 2 2 0 8 1 sigapl 424 437 0 381 8 0 8 8 0 8 0 futexpl 64 353 0 350 1 0 1 1 0 8 0 knotepl 120 554 0 0 17 0 17 17 0 8 0 kqueuepl 224 30 0 20 1 0 1 1 0 8 0 pipepl 336 97 0 70 3 0 3 3 0 8 0 fdescpl 520 418 0 381 4 0 4 4 0 8 0 filepl 160 1602 0 1373 12 0 12 12 0 8 2 lockfpl 104 13 0 7 1 0 1 1 0 8 0 lockfspl 48 8 0 3 1 0 1 1 0 8 0 sessionpl 144 21 0 5 1 0 1 1 0 8 0 pgrppl 48 29 0 5 1 0 1 1 0 8 0 ucredpl 104 117 0 98 1 0 1 1 0 8 0 zombiepl 144 381 0 381 1 0 1 1 0 8 1 processpl 1192 437 0 381 5 0 5 5 0 8 0 procpl 656 476 0 409 6 0 6 6 0 8 0 sockpl 728 241 0 197 9 0 9 9 0 8 5 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 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 107 0 0 14 0 14 14 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 194 0 0 13 0 13 13 0 8 0 bufpl 280 2262 0 116 154 0 154 154 0 8 0 anonpl 32 5320 0 0 43 0 43 43 0 246 0 amapchunkpl 152 8492 0 7962 28 0 28 28 0 158 6 amappl16 200 1906 0 1887 5 0 5 5 0 8 3 amappl15 192 8 0 7 1 0 1 1 0 8 0 amappl14 184 97 0 87 1 0 1 1 0 8 0 amappl13 176 4 0 4 1 0 1 1 0 8 1 amappl12 168 1012 0 975 3 0 3 3 0 8 1 amappl11 160 44 0 34 1 0 1 1 0 8 0 amappl10 152 40 0 40 1 0 1 1 0 8 1 amappl9 144 248 0 248 1 0 1 1 0 8 1 amappl8 136 20 0 19 1 0 1 1 0 8 0 amappl7 128 115 0 104 1 0 1 1 0 8 0 amappl6 120 171 0 168 1 0 1 1 0 8 0 amappl5 112 121 0 115 1 0 1 1 0 8 0 amappl4 104 283 0 266 1 0 1 1 0 8 0 amappl3 96 1286 0 1161 4 0 4 4 0 8 0 amappl2 88 592 0 536 2 0 2 2 0 8 0 amappl1 80 7733 0 7152 14 0 14 14 0 8 1 amappl 88 2346 0 2167 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 418 0 381 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 418 0 381 1 0 1 1 0 8 0 vmmpekpl 168 4847 0 4813 2 0 2 2 0 8 0 vmmpepl 168 32913 0 30825 94 0 94 94 0 357 0 vmsppl 480 417 0 381 7 1 6 6 0 8 1 rwobjpl 72 13509 0 11013 47 0 47 47 0 8 0 pdppl 4096 843 0 762 109 10 99 99 0 8 18 pvpl 32 12387 0 0 100 0 100 100 0 265 0 pmappl 256 417 0 381 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 392 0 13 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(fffffd8008818700) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd8008818700) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd8008818700) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd806be45620,1000,ffff8000307eeba8,ffff8000307eeb8c,0,2,da2cad7728688215,2) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000307eedc0,ffff8000307eedf8,ffff8000307eec40,ffff8000307eec28) at uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1651 uvm_fault_lower(ffff8000307eedc0,ffff8000307eedf8,ffff8000307eed40) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1418 uvm_fault(fffffd806bdfa208,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000307eef50,200000001480) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000307eef50) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x78e62f6fa6e0, 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: 0x739a8daa62a0, 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: 0x739a8daa62a0, count: -3