panic: mtx 0xffffffff83925e70: locking against myself Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *222540 17268 32767 0x10 0 0 syz-executor 258925 47854 32767 0x10 0 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833eadd8) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83925e70) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83925e70) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd8008817108) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd8008817108) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd8008817108) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd806c06e988,1000,ffff80003c43b438,ffff80003c43b41c,0,2,32a32270a1e7ee7,2) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff80003c43b650,ffff80003c43b688,ffff80003c43b4d0,ffff80003c43b4b8) at uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1652 uvm_fault_lower(ffff80003c43b650,ffff80003c43b688,ffff80003c43b5d0) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 uvm_fault(fffffd806c1527a0,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80003c43b7e0,200000001480) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80003c43b7e0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x6fbffe4f5910, 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 0xffffffff83925e70: locking against myself ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833eadd8) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83925e70) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83925e70) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd8008817108) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd8008817108) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd8008817108) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd806c06e988,1000,ffff80003c43b438,ffff80003c43b41c,0,2,32a32270a1e7ee7,2) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff80003c43b650,ffff80003c43b688,ffff80003c43b4d0,ffff80003c43b4b8) at uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1652 uvm_fault_lower(ffff80003c43b650,ffff80003c43b688,ffff80003c43b5d0) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 uvm_fault(fffffd806c1527a0,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80003c43b7e0,200000001480) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80003c43b7e0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x6fbffe4f5910, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c43b180 rbx 0xffffffff83883dcf cpu_info_full_primary+0x2dcf rdx 0 rcx 0xffff80002a2c3ff0 rax 0xffffffff83882ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x3f1c32393ae0bce5 r11 0x2a00f114d30df99a r12 0xffffffff83883bd0 cpu_info_full_primary+0x2bd0 r13 0 r14 0 r15 0x1 rip 0xffffffff826ffe55 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c43b170 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=222540 pid=17268 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=0xffff80002a2c3d48,0xffff80002a2c4aa0 process=0xffff80003a419320 user=0xffff80003c436000, vmspace=0xfffffd806c1527a0 estcpu=36, cpticks=3, pctcpu=0.0, user=1, sys=1, intr=1 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 74611 301428 47854 32767 2 0x10 syz-executor 74611 477838 47854 32767 3 0x4000090 msgwait syz-executor *17268 222540 61251 32767 7 0x10 syz-executor 17268 250200 61251 32767 3 0x4000090 fsleep syz-executor 17268 196467 61251 32767 3 0x4000010 biowait syz-executor 17268 273762 61251 32767 2 0x4000010 syz-executor 59993 422038 93145 0 2 0x2 syz-executor 43037 371784 15151 0 3 0x82 sbwait sshd-session 36152 329101 83552 32767 2 0x10 syz-executor 36152 14666 83552 32767 3 0x4000090 fsleep syz-executor 26770 414637 5125 32767 2 0x10 syz-executor 26770 496431 5125 32767 3 0x4000090 kqsel syz-executor 26770 327154 5125 32767 3 0x4000090 kqsel syz-executor 26770 375999 5125 32767 3 0x4000090 kqsel syz-executor 26770 173229 5125 32767 2 0x4000010 syz-executor 7206 454406 2325 32767 2 0x10 syz-executor 7206 363243 2325 32767 3 0x4000090 fsleep syz-executor 84281 331440 0 0 3 0x14200 bored sosplice 61251 319434 75913 32767 3 0x90 nanoslp syz-executor 47854 258925 6729 32767 7 0x10 syz-executor 2325 127847 23690 32767 3 0x90 nanoslp syz-executor 83552 203589 91557 32767 3 0x90 nanoslp syz-executor 5125 391768 91951 32767 3 0x90 nanoslp syz-executor 42658 49089 57527 32767 3 0x90 wait syz-executor 75913 249422 93145 0 3 0x82 wait syz-executor 91951 308677 93145 0 3 0x82 wait syz-executor 57527 297087 93145 0 3 0x82 wait syz-executor 6729 427025 93145 0 3 0x82 wait syz-executor 23690 45994 93145 0 3 0x82 wait syz-executor 91557 445585 93145 0 3 0x82 wait syz-executor 93145 141850 57944 0 3 0x82 nanoslp syz-executor 57944 324365 67092 0 3 0x10008a sigsusp ksh 67092 376830 88550 0 3 0x98 kqread sshd-session 88550 511563 15151 0 3 0x92 kqread sshd-session 30943 320310 1 0 3 0x100083 ttyin getty 15151 252512 1 0 3 0x88 kqread sshd 54098 250340 94896 73 3 0x1100090 kqread syslogd 94896 374270 1 0 3 0x100082 sbwait syslogd 45712 59555 1 0 3 0x100080 kqread resolvd 64744 308200 99409 77 3 0x100092 kqread dhcpleased 1615 259098 99409 77 3 0x100092 kqread dhcpleased 99409 228679 1 0 3 0x80 kqread dhcpleased 6591 285203 0 0 3 0x14200 bored smr 90911 98180 0 0 2 0x14200 zerothread 17130 311276 0 0 3 0x14200 aiodoned aiodoned 87173 162541 0 0 3 0x14200 syncer update 83168 202883 0 0 3 0x14200 cleaner cleaner 42510 8574 0 0 3 0x14200 reaper reaper 39123 205048 0 0 3 0x14200 pgdaemon pagedaemon 27825 482967 0 0 3 0x14200 bored viomb 87683 289326 0 0 3 0x40014200 acpi0 acpi0 87429 517799 0 0 3 0x40014200 idle1 95490 400062 0 0 3 0x14200 bored softnet3 10129 500154 0 0 3 0x14200 bored softnet2 52785 215464 0 0 3 0x14200 bored softnet1 20562 96788 0 0 3 0x14200 bored softnet0 85559 140680 0 0 3 0x14200 bored systqmp 20461 493866 0 0 3 0x14200 bored systq 4550 521019 0 0 3 0x14200 tmoslp softclockmp 51908 228728 0 0 3 0x40014200 tmoslp softclock 22166 190759 0 0 3 0x40014200 idle0 1 284447 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 (0xffffffff83925e80) #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: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:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 Process 17268 (syz-executor) thread 0xffff80002a2c3ff0 (222540) exclusive rwlock uobjlk r = 0 (0xfffffd806bb7b618) #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: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:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 exclusive mutex &uvm.pageqlock r = 0 (0xffffffff83925e80) #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: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:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 Process 17268 (syz-executor) thread 0xffff80002a2c3aa0 (196467) exclusive rrwlock inode r = 0 (0xfffffd807aa0a2e0) #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: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:577 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10183 10950K 10965K 166960K 11266 0 pcb 17 12K 12K 166960K 17 0 rtable 198 5K 7K 166960K 367 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 2K 166960K 4 0 counters 60 35K 36K 166960K 64 0 ioctlops 0 0K 2K 166960K 32 0 iov 0 0K 4K 166960K 8 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1430 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 14 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 21 77K 129K 166960K 388 0 sigio 0 0K 0K 166960K 4 0 proc 58 79K 127K 166960K 492 0 subproc 58 3K 4K 166960K 139 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 32 0 in_multi 77 5K 7K 166960K 110 0 ether_multi 1 0K 0K 166960K 6 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 373 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 152K 175K 166960K 4844 0 UVM aobj 9 2K 4K 166960K 11 0 pinsyscall 44 88K 117K 166960K 1425 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 18 0 NDP 9 0K 2K 166960K 27 0 temp 49 8685K 8749K 166960K 4794 0 kqueue 13 20K 28K 166960K 57 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 120 110 0 107 2 0 2 2 0 8 1 rtentry 176 115 0 23 6 0 6 6 0 8 0 unpcb 144 254 0 237 4 0 4 4 0 8 3 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 290 0 282 8 0 8 8 0 8 7 arp 128 20 0 4 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 384 436 0 421 8 0 8 8 0 8 6 nd6 144 26 0 6 1 0 1 1 0 8 0 kcovpl 48 15 0 9 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 459 0 88 29 0 29 29 0 8 2 art_table 32 460 0 88 4 0 4 4 0 8 0 art_node 16 114 0 30 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 3 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 12 0 2 1 0 1 1 0 8 0 shmpl 112 8 0 2 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 1874 0 355 95 0 95 95 0 8 0 ffsino 288 1874 0 355 109 0 109 109 0 8 0 nchpl 144 2362 0 668 63 0 63 63 0 8 0 uvmvnodes 80 2022 0 0 42 0 42 42 0 8 0 vnodes 216 2022 0 0 113 0 113 113 0 8 0 namei 1024 7523 0 7523 1 0 1 1 0 8 1 percpumem 16 47 0 2 1 0 1 1 0 8 0 kstatmem 264 22 0 4 2 0 2 2 0 8 0 scxspl 216 8142 0 8140 9 1 8 8 1 8 7 plimitpl 152 81 0 60 2 0 2 2 0 8 1 sigapl 424 655 0 602 8 0 8 8 0 8 1 futexpl 64 3102 0 3099 1 0 1 1 0 8 0 knotepl 120 416 0 0 13 0 13 13 0 8 0 kqueuepl 224 79 0 66 1 0 1 1 0 8 0 pipepl 336 146 0 119 3 0 3 3 0 8 0 fdescpl 520 636 0 602 4 0 4 4 0 8 0 filepl 160 3107 0 2901 15 0 15 15 0 8 5 lockfpl 104 65 0 62 1 0 1 1 0 8 0 lockfspl 48 28 0 25 1 0 1 1 0 8 0 sessionpl 144 31 0 16 1 0 1 1 0 8 0 pgrppl 48 56 0 34 1 0 1 1 0 8 0 ucredpl 104 357 0 340 1 0 1 1 0 8 0 zombiepl 144 603 0 602 1 0 1 1 0 8 0 processpl 1216 655 0 602 5 0 5 5 0 8 0 procpl 680 1031 0 968 7 0 7 7 0 8 1 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 728 804 0 770 14 2 12 14 0 8 8 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 228 0 0 15 0 15 15 0 8 0 bufpl 280 2828 0 113 194 0 194 194 0 8 0 anonpl 32 9433 0 0 77 0 77 77 0 246 0 amapchunkpl 152 15155 0 14620 34 0 34 34 0 158 11 amappl16 200 2500 0 2477 16 6 10 14 0 8 7 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 108 0 97 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 1244 0 1210 3 0 3 3 0 8 1 amappl11 160 76 0 66 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 246 0 246 1 1 0 1 0 8 0 amappl8 136 23 0 22 1 0 1 1 0 8 0 amappl7 128 105 0 93 1 0 1 1 0 8 0 amappl6 120 177 0 172 1 0 1 1 0 8 0 amappl5 112 111 0 105 1 0 1 1 0 8 0 amappl4 104 294 0 276 1 0 1 1 0 8 0 amappl3 96 2694 0 2568 4 0 4 4 0 8 0 amappl2 88 634 0 571 2 0 2 2 0 8 0 amappl1 80 9576 0 8929 14 0 14 14 0 8 0 amappl 88 4122 0 3948 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 10 0 2 1 0 1 1 0 8 0 uaddrrnd 24 636 0 602 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 636 0 602 1 0 1 1 0 8 0 vmmpekpl 168 6919 0 6871 3 0 3 3 0 8 0 vmmpepl 168 47381 0 45261 106 0 106 106 0 357 12 vmsppl 480 635 0 602 7 1 6 6 0 8 1 rwobjpl 72 17486 0 14516 54 0 54 54 0 8 0 pdppl 4096 1280 0 1204 116 34 82 100 0 8 6 pvpl 32 17165 0 0 140 1 139 139 0 265 0 pmappl 256 635 0 602 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 416 0 37 12 0 12 12 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(ffffffff833eadd8) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83925e70) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83925e70) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd8008817108) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd8008817108) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd8008817108) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd806c06e988,1000,ffff80003c43b438,ffff80003c43b41c,0,2,32a32270a1e7ee7,2) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff80003c43b650,ffff80003c43b688,ffff80003c43b4d0,ffff80003c43b4b8) at uvm_fault_lower_io+0x2d1 sys/uvm/uvm_fault.c:1652 uvm_fault_lower(ffff80003c43b650,ffff80003c43b688,ffff80003c43b5d0) at uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 uvm_fault(fffffd806c1527a0,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80003c43b7e0,200000001480) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80003c43b7e0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x6fbffe4f5910, 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 __mp_lock(ffffffff839facc8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839facc8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 syscall(ffff80003c4272b0) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4272b0) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77504b7abbc0, count: 9 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 __mp_lock(ffffffff839facc8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839facc8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 syscall(ffff80003c4272b0) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4272b0) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77504b7abbc0, count: -6