Ě`Óךpanic: mtx 0xffffffff839ef728: locking against myself Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *238209 49976 0 0 0 0 syz-executor 365171 58699 0 0 0 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833f57e2) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff839ef728) at mtx_enter_try+0x1da sys/kern/kern_lock.c:300 mtx_enter(ffffffff839ef728) at mtx_enter+0x62 sys/kern/kern_lock.c:261 uvm_pageclean(fffffd80085ff790) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80085ff790) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80085ff790) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd800dbb0218,1000,ffff80003c433b98,ffff80003c433b7c,0,2,efcad4816ef3747b,2) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff80003c433db0,ffff80003c433de8,ffff80003c433c30,ffff80003c433c18) at uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1652 uvm_fault_lower(ffff80003c433db0,ffff80003c433de8,ffff80003c433d30) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 uvm_fault(fffffd806b985018,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80003c433f40,200000001c00) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c433f40) at usertrap+0x403 sys/arch/amd64/amd64/trap.c:605 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x76f273d28c70, 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 0xffffffff839ef728: locking against myself ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833f57e2) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff839ef728) at mtx_enter_try+0x1da sys/kern/kern_lock.c:300 mtx_enter(ffffffff839ef728) at mtx_enter+0x62 sys/kern/kern_lock.c:261 uvm_pageclean(fffffd80085ff790) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80085ff790) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80085ff790) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd800dbb0218,1000,ffff80003c433b98,ffff80003c433b7c,0,2,efcad4816ef3747b,2) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff80003c433db0,ffff80003c433de8,ffff80003c433c30,ffff80003c433c18) at uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1652 uvm_fault_lower(ffff80003c433db0,ffff80003c433de8,ffff80003c433d30) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 uvm_fault(fffffd806b985018,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80003c433f40,200000001c00) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c433f40) at usertrap+0x403 sys/arch/amd64/amd64/trap.c:605 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x76f273d28c70, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c4338d0 rbx 0xffffffff83806ddf cpu_info_full_primary+0x2ddf rdx 0 rcx 0xffff800036c17c58 rax 0xffffffff83805ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xad9561d55265387b r11 0x1d83aef42c3fc41a r12 0xffffffff83806be0 cpu_info_full_primary+0x2be0 r13 0 r14 0 r15 0x1 rip 0xffffffff812b8285 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c4338c0 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=238209 pid=49976 tcnt=4 stat=onproc flags process=0 proc=0 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800036c16028,0xffff800036c162c8 process=0xffff800036c18ec0 user=0xffff80003c42e000, vmspace=0xfffffd806b985018 estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *49976 238209 20852 0 7 0 syz-executor 49976 469664 20852 0 3 0x4000080 fsleep syz-executor 49976 517186 20852 0 3 0x4000000 biowait syz-executor 49976 320183 20852 0 3 0x4000080 fsleep syz-executor 80232 515562 57485 0 2 0 syz-executor 80232 257049 57485 0 2 0x4000000 syz-executor 37417 58214 73249 60929 2 0x10 syz-executor 37417 462644 73249 60929 3 0x4000090 fsleep syz-executor 30986 71832 71401 0 2 0 syz-executor 30986 445326 71401 0 3 0x4000080 fsleep syz-executor 2766 132670 62641 0 2 0 syz-executor 2766 37734 62641 0 3 0x4000080 lockf syz-executor 2766 190977 62641 0 2 0x4000000 syz-executor 2766 80926 62641 0 2 0x4000000 syz-executor 14669 70698 87092 0 2 0 syz-executor 14669 367962 87092 0 3 0x4000080 bell syz-executor 58699 365171 65117 0 7 0 syz-executor 58699 503887 65117 0 2 0x4000000 syz-executor 58699 396707 65117 0 2 0x4000000 syz-executor 58019 478923 37813 0 2 0x2 ndp 37813 185977 7237 0 3 0x10008a sigsusp sh 73249 312943 68823 0 3 0x82 nanoslp syz-executor 71401 275150 68823 0 3 0x82 nanoslp syz-executor 7237 218610 68823 0 3 0x82 wait syz-executor 20852 329709 68823 0 3 0x82 nanoslp syz-executor 62641 121094 68823 0 3 0x82 nanoslp syz-executor 87092 119227 68823 0 3 0x82 nanoslp syz-executor 57485 406680 68823 0 3 0x82 nanoslp syz-executor 65117 296844 68823 0 3 0x82 nanoslp syz-executor 68823 149185 30188 0 3 0x82 kqread syz-executor 30188 358699 52947 0 3 0x10008a sigsusp ksh 52947 326707 623 0 3 0x98 kqread sshd-session 623 461373 57453 0 3 0x92 kqread sshd-session 18803 237371 1 0 3 0x100083 ttyin getty 57453 456872 1 0 3 0x88 kqread sshd 27357 43636 49212 74 3 0x1100092 bpf pflogd 49212 479528 1 0 3 0x80 sbwait pflogd 65947 182761 44603 73 3 0x1100090 kqread syslogd 44603 182045 1 0 3 0x100082 sbwait syslogd 44231 467369 1 0 3 0x100080 kqread resolvd 7324 403744 60934 77 3 0x100092 kqread dhcpleased 19238 358347 60934 77 3 0x100092 kqread dhcpleased 60934 340710 1 0 3 0x80 kqread dhcpleased 91861 450058 0 0 3 0x14200 bored smr 20309 21116 0 0 2 0x14200 zerothread 58232 471348 0 0 3 0x14200 aiodoned aiodoned 85751 234945 0 0 3 0x14200 syncer update 17903 515446 0 0 3 0x14200 cleaner cleaner 97019 151992 0 0 3 0x14200 reaper reaper 70524 249838 0 0 3 0x14200 pgdaemon pagedaemon 74373 453940 0 0 3 0x14200 bored viomb 7248 424776 0 0 3 0x40014200 acpi0 acpi0 66827 332879 0 0 3 0x40014200 idle1 33530 27699 0 0 3 0x14200 bored softnet7 41092 323968 0 0 3 0x14200 bored softnet6 85946 411208 0 0 3 0x14200 bored softnet5 89588 126179 0 0 3 0x14200 bored softnet4 38870 455145 0 0 3 0x14200 bored softnet3 44927 79975 0 0 3 0x14200 bored softnet2 93080 285627 0 0 3 0x14200 bored softnet1 3459 168782 0 0 3 0x14200 bored softnet0 27472 263449 0 0 3 0x14200 bored systqmp 91136 125898 0 0 3 0x14200 bored systq 67503 318530 0 0 3 0x14200 tmoslp softclockmp 10352 37718 0 0 3 0x40014200 tmoslp softclock 16704 474935 0 0 3 0x40014200 idle0 1 343557 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 (0xffffffff839ef738) #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+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 uvn_get+0x679 sys/uvm/uvm_vnode.c:1117 #4 uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1652 #5 uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 #6 uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #8 usertrap+0x403 sys/arch/amd64/amd64/trap.c:605 #9 recall_trap+0x8 Process 49976 (syz-executor) thread 0xffff800036c17c58 (238209) exclusive rwlock uobjlk r = 0 (0xfffffd806b96d9e8) #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+0x42b sys/kern/kern_rwlock.c:319 #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:1652 #5 uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 #6 uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #8 usertrap+0x403 sys/arch/amd64/amd64/trap.c:605 #9 recall_trap+0x8 exclusive mutex &uvm.pageqlock r = 0 (0xffffffff839ef738) #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+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 uvn_get+0x679 sys/uvm/uvm_vnode.c:1117 #4 uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1652 #5 uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 #6 uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #8 usertrap+0x403 sys/arch/amd64/amd64/trap.c:605 #9 recall_trap+0x8 Process 49976 (syz-executor) thread 0xffff800036c174a8 (517186) exclusive rrwlock inode r = 0 (0xfffffd806afbd458) #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+0x42b sys/kern/kern_rwlock.c:319 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #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:748 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10200 11032K 11089K 166960K 11300 0 pcb 17 12K 12K 166960K 17 0 rtable 211 6K 6K 166960K 278 0 pf 34 17K 21K 166960K 49 0 ifaddr 43 7K 7K 166960K 45 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 1 1K 9K 166960K 5 0 counters 68 36K 36K 166960K 68 0 ioctlops 0 0K 4K 166960K 1486 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1343 84K 85K 166960K 1382 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 19 69K 89K 166960K 152 0 proc 72 115K 180K 166960K 531 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 100 7K 7K 166960K 100 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 49 228K 228K 166960K 49 0 exec 0 0K 1K 166960K 374 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 244 177K 185K 166960K 3167 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 44 88K 102K 166960K 1269 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 2 0 NDP 17 0K 1K 166960K 28 0 temp 35 8670K 8734K 166960K 4084 0 kqueue 13 20K 22K 166960K 24 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 38 0 35 1 0 1 1 0 8 0 rtentry 176 95 0 1 5 0 5 5 0 8 0 unpcb 144 39 0 20 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 11 0 7 1 0 1 1 0 8 0 arp 128 10 0 0 1 0 1 1 0 8 0 inpcb 328 72 0 64 2 0 2 2 0 8 1 nd6 144 16 0 0 1 0 1 1 0 8 0 kcovpl 48 8 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 18 0 0 1 0 1 1 0 8 0 pfstkey 128 18 0 0 1 0 1 1 0 8 0 pfstate 384 18 0 0 2 0 2 2 0 8 0 pfrule 1344 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 436 0 0 28 0 28 28 0 8 0 art_table 40 437 0 0 5 0 5 5 0 8 0 art_node 32 95 0 11 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1589 0 77 95 0 95 95 0 8 0 ffsino 296 1589 0 77 117 0 117 117 0 8 0 nchpl 144 1791 0 101 63 0 63 63 0 8 0 uvmvnodes 80 1694 0 0 35 0 35 35 0 8 0 vnodes 216 1694 0 0 95 0 95 95 0 8 0 namei 1024 5547 0 5547 2 0 2 2 0 8 2 percpumem 16 49 0 0 1 0 1 1 0 8 0 kstatmem 264 26 0 0 2 0 2 2 0 8 0 scxspl 216 6800 0 6798 9 1 8 8 1 8 7 plimitpl 152 29 0 12 1 0 1 1 0 8 0 sigapl 424 466 0 411 7 0 7 7 0 8 0 knotepl 120 58 0 0 2 0 2 2 0 8 0 kqueuepl 224 20 0 11 1 0 1 1 0 8 0 pipepl 344 108 0 81 3 0 3 3 0 8 0 fdescpl 528 444 0 411 3 0 3 3 0 8 0 filepl 160 1519 0 1298 10 0 10 10 0 8 0 lockfpl 104 13 0 6 1 0 1 1 0 8 0 lockfspl 48 8 0 3 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 30 0 13 1 0 1 1 0 8 0 ucredpl 104 92 0 78 1 0 1 1 0 8 0 zombiepl 144 411 0 411 1 0 1 1 0 8 1 processpl 1248 466 0 411 5 0 5 5 0 8 0 procpl 656 506 0 439 6 0 6 6 0 8 0 sockpl 752 149 0 119 4 0 4 4 0 8 1 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 124 0 0 16 0 16 16 0 8 0 mcl2k 2048 27 0 0 4 0 4 4 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 131 0 0 9 0 9 9 0 8 0 bufpl 280 2889 0 122 198 0 198 198 0 8 0 anonpl 32 3888 0 0 32 0 32 32 0 246 0 amapchunkpl 152 8797 0 8307 22 3 19 19 0 158 0 amappl16 200 1657 0 1637 5 1 4 5 0 8 2 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 114 0 102 1 0 1 1 0 8 0 amappl13 176 17 0 17 2 2 0 1 0 8 0 amappl12 168 1112 0 1079 2 0 2 2 0 8 0 amappl11 160 56 0 42 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 285 0 285 1 1 0 1 0 8 0 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 114 0 102 1 0 1 1 0 8 0 amappl6 120 251 0 247 1 0 1 1 0 8 0 amappl5 112 120 0 111 1 0 1 1 0 8 0 amappl4 104 304 0 284 1 0 1 1 0 8 0 amappl3 96 1385 0 1273 3 0 3 3 0 8 0 amappl2 88 646 0 582 2 0 2 2 0 8 0 amappl1 80 8407 0 7780 14 0 14 14 0 8 0 amappl 88 2469 0 2303 4 0 4 4 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 8 0 8 2 1 1 1 0 8 1 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 24 444 0 411 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 444 0 411 1 0 1 1 0 8 0 vmmpekpl 168 5338 0 5311 2 0 2 2 0 8 0 vmmpepl 168 35014 0 32999 88 0 88 88 0 357 0 vmsppl 488 443 0 411 5 0 5 5 0 8 0 rwobjpl 80 14149 0 11505 55 0 55 55 0 8 0 pdppl 4096 895 0 822 95 16 79 83 0 8 6 pvpl 32 10910 0 0 90 1 89 89 0 265 1 pmappl 256 443 0 411 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 265 0 18 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(ffffffff833f57e2) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff839ef728) at mtx_enter_try+0x1da sys/kern/kern_lock.c:300 mtx_enter(ffffffff839ef728) at mtx_enter+0x62 sys/kern/kern_lock.c:261 uvm_pageclean(fffffd80085ff790) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80085ff790) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80085ff790) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd800dbb0218,1000,ffff80003c433b98,ffff80003c433b7c,0,2,efcad4816ef3747b,2) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff80003c433db0,ffff80003c433de8,ffff80003c433c30,ffff80003c433c18) at uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1652 uvm_fault_lower(ffff80003c433db0,ffff80003c433de8,ffff80003c433d30) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 uvm_fault(fffffd806b985018,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80003c433f40,200000001c00) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c433f40) at usertrap+0x403 sys/arch/amd64/amd64/trap.c:605 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x76f273d28c70, count: -13 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299ddff0) 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: 0x783938cbd0a0, count: 12 ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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: 0x783938cbd0a0, count: -3