panic: mtx 0xffffffff838719a8: locking against myself Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 267297 76854 0 0 0 1 syz-executor * 95052 3354 32767 0x10 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8333772b) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff838719a8) at mtx_enter_try+0x1da mtx_enter(ffffffff838719a8) at mtx_enter+0x62 sys/kern/kern_lock.c:261 uvm_pageclean(fffffd800886f1c8) at uvm_pageclean+0x28e uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd800886f1c8) at uvm_pageclean+0x28e sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd800886f1c8) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd8064e6da00,0,ffff80002a383058,ffff80002a38303c,0,2,6eb8ff3cb4371e43,2) at uvn_get+0x686 sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff80002a383270,ffff80002a3832a8,ffff80002a3830f0,ffff80002a3830d8) at uvm_fault_lower_io+0x2cd sys/uvm/uvm_fault.c:1652 uvm_fault_lower(ffff80002a383270,ffff80002a3832a8,ffff80002a3831f0) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 uvm_fault(fffffd807762c018,200000000000,0,2) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80002a383400,2000000000c0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80002a383400) at usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7a63ea0d41e0, 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 0xffffffff838719a8: locking against myself ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8333772b) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff838719a8) at mtx_enter_try+0x1da mtx_enter(ffffffff838719a8) at mtx_enter+0x62 sys/kern/kern_lock.c:261 uvm_pageclean(fffffd800886f1c8) at uvm_pageclean+0x28e uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd800886f1c8) at uvm_pageclean+0x28e sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd800886f1c8) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd8064e6da00,0,ffff80002a383058,ffff80002a38303c,0,2,6eb8ff3cb4371e43,2) at uvn_get+0x686 sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff80002a383270,ffff80002a3832a8,ffff80002a3830f0,ffff80002a3830d8) at uvm_fault_lower_io+0x2cd sys/uvm/uvm_fault.c:1652 uvm_fault_lower(ffff80002a383270,ffff80002a3832a8,ffff80002a3831f0) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 uvm_fault(fffffd807762c018,200000000000,0,2) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80002a383400,2000000000c0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80002a383400) at usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7a63ea0d41e0, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a382d90 rbx 0xffffffff8384fddf cpu_info_full_primary+0x2ddf rdx 0 rcx 0xffff80003b4627f8 rax 0xffffffff8384eff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xf8e083389e41a4fb r11 0x4c464065123f684e r12 0xffffffff8384fbe0 cpu_info_full_primary+0x2be0 r13 0 r14 0 r15 0x1 rip 0xffffffff828d3935 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a382d80 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=95052 pid=3354 tcnt=4 stat=onproc flags process=10 proc=0 runpri=50, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003b462fc0,0xffff80003b463a30 process=0xffff80003b466730 user=0xffff80002a37e000, vmspace=0xfffffd807762c018 estcpu=36, cpticks=2, pctcpu=0.0, user=1, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 76854 267297 48405 0 7 0 syz-executor * 3354 95052 98938 32767 7 0x10 syz-executor 3354 211844 98938 32767 3 0x4000090 fsleep syz-executor 3354 83374 98938 32767 3 0x4000010 biowait syz-executor 3354 43091 98938 32767 3 0x4000090 fsleep syz-executor 48405 503242 37596 0 3 0x82 wait syz-executor 18156 392281 40802 32767 2 0x10 syz-executor 18156 219561 40802 32767 3 0x4000090 fsleep syz-executor 32899 104503 50901 32767 3 0x90 nanoslp syz-executor 32899 148365 50901 32767 3 0x4000090 kqsel syz-executor 32899 514602 50901 32767 3 0x4000090 fsleep syz-executor 28379 411025 70265 0 3 0x82 sbwait sshd-session 5325 302972 0 0 3 0x14200 bored sosplice 50901 88861 54579 32767 3 0x90 nanoslp syz-executor 54612 298504 88094 32767 3 0x90 piperd syz-executor 98938 246302 68817 32767 3 0x90 nanoslp syz-executor 10380 185820 11361 32767 3 0x90 piperd syz-executor 40802 157348 59037 32767 3 0x90 nanoslp syz-executor 35360 66484 65561 32767 3 0x90 piperd syz-executor 54579 457016 37596 0 3 0x82 wait syz-executor 68817 462532 37596 0 3 0x82 wait syz-executor 88094 463754 37596 0 3 0x82 wait syz-executor 11361 4921 37596 0 3 0x82 wait syz-executor 59037 512162 37596 0 3 0x82 wait syz-executor 65561 484601 37596 0 3 0x82 wait syz-executor 37596 98955 84089 0 2 0x10000002 syz-executor 84089 430111 12128 0 3 0x10008a sigsusp ksh 12128 270978 74863 0 3 0x98 kqread sshd-session 74863 204064 70265 0 3 0x92 kqread sshd-session 3609 252437 1 0 3 0x100083 ttyin getty 70265 132035 1 0 3 0x88 kqread sshd 90771 183528 68836 73 3 0x1100090 kqread syslogd 68836 272791 1 0 3 0x100082 sbwait syslogd 30710 228987 1 0 3 0x100080 kqread resolvd 64673 18181 29532 77 3 0x100092 kqread dhcpleased 72981 109771 29532 77 3 0x100092 kqread dhcpleased 29532 270361 1 0 3 0x80 kqread dhcpleased 26569 135621 0 0 3 0x14200 bored smr 55227 226884 0 0 2 0x14200 zerothread 21623 444300 0 0 3 0x14200 aiodoned aiodoned 11140 7686 0 0 3 0x14200 syncer update 49348 192598 0 0 3 0x14200 cleaner cleaner 78058 49370 0 0 3 0x14200 reaper reaper 6064 183993 0 0 3 0x14200 pgdaemon pagedaemon 81018 366867 0 0 3 0x14200 bored viomb 26703 113706 0 0 3 0x40014200 acpi0 acpi0 54523 490063 0 0 3 0x40014200 idle1 7669 485382 0 0 3 0x14200 bored softnet7 25429 434409 0 0 3 0x14200 bored softnet6 6184 75854 0 0 3 0x14200 bored softnet5 71462 359013 0 0 3 0x14200 bored softnet4 36141 212979 0 0 3 0x14200 bored softnet3 56253 448960 0 0 3 0x14200 bored softnet2 97777 468317 0 0 3 0x14200 bored softnet1 51645 375005 0 0 3 0x14200 bored softnet0 12735 296745 0 0 3 0x14200 bored systqmp 3551 380976 0 0 3 0x14200 bored systq 27236 235464 0 0 3 0x14200 tmoslp softclockmp 21016 66406 0 0 3 0x40014200 tmoslp softclock 51588 14819 0 0 3 0x40014200 idle0 1 479991 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 (0xffffffff838719b8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 uvn_get+0x674 sys/uvm/uvm_vnode.c:1117 #4 uvm_fault_lower_io+0x2cd sys/uvm/uvm_fault.c:1652 #5 uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 #6 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #8 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #9 recall_trap+0x8 Process 3354 (syz-executor) thread 0xffff80003b4627f8 (95052) exclusive rwlock uobjlk r = 0 (0xfffffd805d6e3438) #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 uvn_io+0x667 sys/uvm/uvm_vnode.c:1298 #3 uvn_get+0x31d sys/uvm/uvm_vnode.c:1102 #4 uvm_fault_lower_io+0x2cd sys/uvm/uvm_fault.c:1652 #5 uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 #6 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #8 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #9 recall_trap+0x8 exclusive mutex &uvm.pageqlock r = 0 (0xffffffff838719b8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 uvn_get+0x674 sys/uvm/uvm_vnode.c:1117 #4 uvm_fault_lower_io+0x2cd sys/uvm/uvm_fault.c:1652 #5 uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 #6 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #8 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #9 recall_trap+0x8 Process 3354 (syz-executor) thread 0xffff80003b463258 (83374) exclusive rrwlock inode r = 0 (0xfffffd806fa04338) #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 sys_ftruncate+0x1c1 sys/kern/vfs_syscalls.c:2916 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10194 10952K 10968K 166960K 11278 0 pcb 17 14K 16K 166960K 19 0 rtable 175 5K 6K 166960K 296 0 pf 27 16K 16K 166960K 31 0 ifaddr 34 6K 7K 166960K 44 0 ifgroup 42 1K 2K 166960K 50 0 sysctl 3 1K 9K 166960K 8 0 counters 64 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 34 0 iov 0 0K 12K 166960K 19 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1492 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 18 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 19 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 121K 166960K 522 0 sigio 0 0K 0K 166960K 2 0 proc 58 99K 147K 166960K 517 0 subproc 63 3K 4K 166960K 189 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 86 0 in_multi 77 5K 7K 166960K 114 0 ether_multi 1 0K 0K 166960K 2 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 391 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 220 151K 177K 166960K 6057 0 UVM aobj 54 4K 6K 166960K 57 0 pinsyscall 42 84K 110K 166960K 1569 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 39 0 NDP 9 0K 2K 166960K 27 0 temp 48 8646K 8712K 166960K 5446 0 kqueue 13 20K 31K 166960K 109 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 120 132 0 129 3 0 3 3 0 8 2 rtentry 176 109 0 30 5 0 5 5 0 8 0 unpcb 144 236 0 214 3 1 2 2 0 8 0 syncache 336 8 0 8 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 199 0 190 7 3 4 7 0 8 3 arp 128 11 0 3 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 328 577 0 564 12 2 10 12 0 8 8 ip6q 72 4 0 1 1 0 1 1 0 8 0 ip6af 40 8 0 3 1 0 1 1 0 8 0 nd6 144 29 0 14 1 0 1 1 0 8 0 kcovpl 48 21 0 14 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 500 0 143 30 0 30 30 0 8 5 art_table 40 501 0 143 5 0 5 5 0 8 0 art_node 32 109 0 38 1 0 1 1 0 8 0 sysvmsgpl 40 21 0 13 1 0 1 1 0 8 0 semapl 112 16 0 6 1 0 1 1 0 8 0 shmpl 112 54 0 3 2 0 2 2 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2048 0 524 96 0 96 96 0 8 0 ffsino 296 2048 0 524 118 0 118 118 0 8 0 nchpl 144 2720 0 1030 63 0 63 63 0 8 0 uvmvnodes 80 2246 0 0 46 0 46 46 0 8 0 vnodes 216 2246 0 0 125 0 125 125 0 8 0 namei 1024 8825 0 8825 2 1 1 2 0 8 1 percpumem 16 49 0 2 1 0 1 1 0 8 0 kstatmem 264 24 0 4 2 0 2 2 0 8 0 scxspl 216 9484 0 9483 7 4 3 6 1 8 2 plimitpl 152 127 0 104 2 0 2 2 0 8 1 sigapl 424 785 0 729 8 0 8 8 0 8 0 knotepl 120 543 0 0 17 0 17 17 0 8 0 kqueuepl 224 137 0 126 2 0 2 2 0 8 1 pipepl 344 169 0 142 3 0 3 3 0 8 0 fdescpl 528 762 0 730 3 0 3 3 0 8 0 filepl 160 3798 0 3593 15 0 15 15 0 8 5 lockfpl 104 213 0 209 2 0 2 2 0 8 1 lockfspl 48 35 0 31 1 0 1 1 0 8 0 sessionpl 144 39 0 23 1 0 1 1 0 8 0 pgrppl 48 64 0 40 1 0 1 1 0 8 0 ucredpl 104 505 0 488 1 0 1 1 0 8 0 zombiepl 144 730 0 729 1 0 1 1 0 8 0 processpl 1248 785 0 729 7 1 6 6 0 8 0 procpl 664 1326 0 1264 7 0 7 7 0 8 0 sosppl 168 8 0 8 1 0 1 1 0 8 1 sockpl 752 955 0 917 16 4 12 16 0 8 8 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 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 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 0 16 16 0 8 0 mcl2k 2048 39 0 0 5 0 5 5 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 281 0 0 18 0 18 18 0 8 0 bufpl 280 3445 0 117 238 0 238 238 0 8 0 anonpl 32 9352 0 0 76 0 76 76 0 246 0 amapchunkpl 152 18965 0 18532 36 3 33 34 0 158 14 amappl16 200 3182 0 3164 29 8 21 21 0 8 19 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 111 0 100 1 0 1 1 0 8 0 amappl13 176 24 0 24 1 1 0 1 0 8 0 amappl12 168 1401 0 1370 2 0 2 2 0 8 0 amappl11 160 45 0 35 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 21 0 20 1 0 1 1 0 8 0 amappl7 128 101 0 90 1 0 1 1 0 8 0 amappl6 120 182 0 178 1 0 1 1 0 8 0 amappl5 112 116 0 109 1 0 1 1 0 8 0 amappl4 104 282 0 266 1 0 1 1 0 8 0 amappl3 96 3483 0 3380 4 0 4 4 0 8 0 amappl2 88 653 0 592 2 0 2 2 0 8 0 amappl1 80 10654 0 10018 17 1 16 17 0 8 0 amappl 88 5321 0 5172 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 56 0 3 1 0 1 1 0 8 0 uaddrrnd 24 762 0 730 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 762 0 730 1 0 1 1 0 8 0 vmmpekpl 168 8069 0 8022 4 1 3 3 0 8 0 vmmpepl 168 55537 0 53578 115 0 115 115 0 357 15 vmsppl 488 761 0 730 7 1 6 6 0 8 0 rwobjpl 80 20137 0 16945 72 0 72 72 0 8 1 pdppl 4096 1531 0 1460 121 42 79 95 0 8 8 pvpl 32 19080 0 0 154 0 154 154 0 265 0 pmappl 256 761 0 730 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 310 0 49 8 0 8 8 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(ffffffff8333772b) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff838719a8) at mtx_enter_try+0x1da mtx_enter(ffffffff838719a8) at mtx_enter+0x62 sys/kern/kern_lock.c:261 uvm_pageclean(fffffd800886f1c8) at uvm_pageclean+0x28e uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd800886f1c8) at uvm_pageclean+0x28e sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd800886f1c8) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd8064e6da00,0,ffff80002a383058,ffff80002a38303c,0,2,6eb8ff3cb4371e43,2) at uvn_get+0x686 sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff80002a383270,ffff80002a3832a8,ffff80002a3830f0,ffff80002a3830d8) at uvm_fault_lower_io+0x2cd sys/uvm/uvm_fault.c:1652 uvm_fault_lower(ffff80002a383270,ffff80002a3832a8,ffff80002a3831f0) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 uvm_fault(fffffd807762c018,200000000000,0,2) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80002a383400,2000000000c0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80002a383400) at usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7a63ea0d41e0, 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 __mp_lock(ffffffff8398e170) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8398e170) at __mp_lock+0x199 sys/kern/kern_lock.c:165 syscall(ffff8000340213b0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff8000340213b0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x741ede9fb9e0, count: 9 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 __mp_lock(ffffffff8398e170) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8398e170) at __mp_lock+0x199 sys/kern/kern_lock.c:165 syscall(ffff8000340213b0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff8000340213b0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x741ede9fb9e0, count: -6