login: panic: mtx 0xffffffff838c2b90: locking against myself Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *111541 3130 32767 0x10 0 0 syz-executor 197179 56385 32767 0x10 0x4000000 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833e0740) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff838c2b90) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff838c2b90) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80087da030) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80087da030) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80087da030) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd80697c3ec8,0,ffff80002a3624b8,ffff80002a362494,0,2,802ab90ade59bcdb,ffff80002a362710) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff80002a3626d8,ffff80002a362710,ffff80002a362540,ffff80002a362548) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff80002a3626d8,ffff80002a362710,ffff80002a362650) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806c14f980,200000000000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80002a362860,200000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002a362860) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7aa1cee29240, 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 0xffffffff838c2b90: locking against myself ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833e0740) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff838c2b90) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff838c2b90) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80087da030) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80087da030) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80087da030) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd80697c3ec8,0,ffff80002a3624b8,ffff80002a362494,0,2,802ab90ade59bcdb,ffff80002a362710) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff80002a3626d8,ffff80002a362710,ffff80002a362540,ffff80002a362548) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff80002a3626d8,ffff80002a362710,ffff80002a362650) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806c14f980,200000000000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80002a362860,200000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002a362860) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7aa1cee29240, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a362200 rbx 0xffffffff837dedcf cpu_info_full_primary+0x2dcf rdx 0 rcx 0xffff8000ffff0cf0 rax 0xffffffff837ddff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xb1f783226d419ecc r11 0x9de4de07f6fe54e r12 0xffffffff837debd0 cpu_info_full_primary+0x2bd0 r13 0 r14 0 r15 0x1 rip 0xffffffff831ecae5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a3621f0 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=111541 pid=3130 tcnt=3 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=0xffff8000ffff0a60,0xffff8000ffff0550 process=0xffff8000390212c0 user=0xffff80002a35d000, vmspace=0xfffffd806c14f980 estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 58851 279611 70207 32767 2 0x10 syz-executor * 3130 111541 80151 32767 7 0x10 syz-executor 3130 502381 80151 32767 3 0x4000010 biowait syz-executor 3130 13308 80151 32767 3 0x4000090 fsleep syz-executor 53769 242937 11668 0 2 0x2 syz-executor 41618 366343 3734 0 2 0 syz-executor 14146 110714 95396 32767 2 0x10 syz-executor 14146 62319 95396 32767 3 0x4000090 fsleep syz-executor 56385 477795 98872 32767 2 0x10 syz-executor 56385 197179 98872 32767 7 0x4000010 syz-executor 3734 293320 11668 0 2 0x2 syz-executor 12116 330157 30115 0 3 0x82 sbwait sshd-session 37921 507616 30115 0 3 0x82 sbwait sshd-session 43187 37714 0 0 3 0x14200 bored sosplice 70207 105823 47232 32767 3 0x90 nanoslp syz-executor 80151 251080 60517 32767 3 0x90 nanoslp syz-executor 32618 253522 49142 32767 3 0x90 nanoslp syz-executor 98872 159407 9114 32767 3 0x90 nanoslp syz-executor 95396 413340 91582 32767 3 0x90 nanoslp syz-executor 47232 259547 11668 0 3 0x82 wait syz-executor 60517 439256 11668 0 3 0x82 wait syz-executor 49142 222283 11668 0 3 0x82 wait syz-executor 91582 374843 11668 0 3 0x82 wait syz-executor 9114 233746 11668 0 3 0x82 wait syz-executor 11668 284774 26525 0 3 0x82 nanoslp syz-executor 26525 404494 86681 0 3 0x10008a sigsusp ksh 86681 340874 99136 0 3 0x98 kqread sshd-session 99136 234268 30115 0 3 0x92 kqread sshd-session 24686 335507 1 0 3 0x100083 ttyin getty 30115 40579 1 0 3 0x88 kqread sshd 73235 93316 91291 73 3 0x1100090 kqread syslogd 91291 313933 1 0 3 0x100082 sbwait syslogd 9084 14254 1 0 3 0x100080 kqread resolvd 27523 215300 86627 77 3 0x100092 kqread dhcpleased 3937 433693 86627 77 3 0x100092 kqread dhcpleased 86627 432299 1 0 3 0x80 kqread dhcpleased 86471 410852 0 0 3 0x14200 bored smr 33401 504702 0 0 2 0x14200 zerothread 76368 102356 0 0 3 0x14200 aiodoned aiodoned 79440 481385 0 0 3 0x14200 syncer update 59639 192319 0 0 3 0x14200 cleaner cleaner 47676 448558 0 0 3 0x14200 reaper reaper 39479 219299 0 0 3 0x14200 pgdaemon pagedaemon 60090 282472 0 0 3 0x14200 bored viomb 13326 310705 0 0 3 0x40014200 acpi0 acpi0 19546 250008 0 0 3 0x40014200 idle1 88441 227722 0 0 3 0x14200 bored softnet3 31934 441745 0 0 3 0x14200 bored softnet2 15840 482826 0 0 3 0x14200 bored softnet1 40315 104546 0 0 3 0x14200 bored softnet0 42776 234426 0 0 3 0x14200 bored systqmp 16714 186178 0 0 3 0x14200 bored systq 62409 282215 0 0 3 0x14200 tmoslp softclockmp 88661 284353 0 0 3 0x40014200 tmoslp softclock 43181 68649 0 0 3 0x40014200 idle0 1 37187 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 (0xffffffff838c2ba0) #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+0x319 sys/uvm/uvm_fault.c:1588 #5 uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 #6 uvm_fault+0x272 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 3130 (syz-executor) thread 0xffff8000ffff0cf0 (111541) exclusive rwlock uobjlk r = 0 (0xfffffd8061c203d0) #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+0x319 sys/uvm/uvm_fault.c:1588 #5 uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 #6 uvm_fault+0x272 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 (0xffffffff838c2ba0) #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+0x319 sys/uvm/uvm_fault.c:1588 #5 uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 #6 uvm_fault+0x272 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 3130 (syz-executor) thread 0xffff8000ffff02b0 (502381) exclusive rrwlock inode r = 0 (0xfffffd806cbbaaf8) #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:2920 #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 10179 10947K 10965K 166960K 11265 0 pcb 17 12K 12K 166960K 17 0 rtable 172 4K 7K 166960K 372 0 pf 25 16K 16K 166960K 31 0 ifaddr 30 5K 7K 166960K 44 0 ifgroup 38 1K 2K 166960K 50 0 sysctl 1 1K 1K 166960K 1 0 counters 58 35K 36K 166960K 64 0 ioctlops 0 0K 2K 166960K 33 0 iov 0 0K 24K 166960K 21 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1745 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 14 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 20 70K 121K 166960K 507 0 sigio 0 0K 0K 166960K 14 0 proc 58 79K 103K 166960K 509 0 subproc 54 3K 4K 166960K 324 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 61 0 in_multi 66 4K 7K 166960K 108 0 ether_multi 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 443 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 223 169K 202K 166960K 5660 0 UVM aobj 15 2K 2K 166960K 17 0 pinsyscall 45 90K 112K 166960K 1576 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 15 0 NDP 8 0K 2K 166960K 27 0 temp 39 8681K 8744K 166960K 5429 0 kqueue 16 22K 28K 166960K 68 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 120 129 0 125 3 0 3 3 0 8 2 rtentry 176 115 0 36 6 0 6 6 0 8 0 unpcb 144 281 0 262 2 0 2 2 0 8 1 syncache 336 13 0 13 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 175 0 166 8 0 8 8 0 8 7 arp 128 19 0 6 1 0 1 1 0 8 0 ipq 40 2 0 1 1 0 1 1 0 8 0 ipqe 40 5 0 4 1 0 1 1 0 8 0 inpcb 384 423 0 407 10 1 9 9 0 8 6 nd6 144 27 0 11 1 0 1 1 0 8 0 kcovpl 48 36 0 30 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 460 0 136 29 0 29 29 0 8 4 art_table 32 461 0 136 4 0 4 4 0 8 0 art_node 16 114 0 42 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semupl 112 3 0 3 1 0 1 1 0 8 1 semapl 112 12 0 2 1 0 1 1 0 8 0 shmpl 112 14 0 2 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2067 0 528 97 0 97 97 0 8 0 ffsino 288 2067 0 528 110 0 110 110 0 8 0 nchpl 144 2631 0 923 64 0 64 64 0 8 0 uvmvnodes 80 2400 0 0 49 0 49 49 0 8 0 vnodes 216 2400 0 0 134 0 134 134 0 8 0 namei 1024 8774 0 8774 2 0 2 2 0 8 2 percpumem 16 47 0 3 1 0 1 1 0 8 0 kstatmem 264 22 0 6 2 0 2 2 0 8 0 scxspl 216 8194 0 8192 3 2 1 2 1 8 0 plimitpl 152 129 0 108 2 0 2 2 0 8 1 sigapl 424 740 0 687 8 0 8 8 0 8 0 futexpl 64 3637 0 3635 1 0 1 1 0 8 0 knotepl 120 546 0 0 17 0 17 17 0 8 0 kqueuepl 224 125 0 113 3 0 3 3 0 8 2 pipepl 336 206 0 179 3 0 3 3 0 8 0 fdescpl 520 721 0 687 3 0 3 3 0 8 0 filepl 160 4214 0 4011 15 0 15 15 0 8 4 lockfpl 104 120 0 117 1 0 1 1 0 8 0 lockfspl 48 34 0 31 1 0 1 1 0 8 0 sessionpl 144 57 0 42 1 0 1 1 0 8 0 pgrppl 48 97 0 75 1 0 1 1 0 8 0 ucredpl 104 813 0 797 1 0 1 1 0 8 0 zombiepl 144 688 0 687 1 0 1 1 0 8 0 processpl 1192 740 0 687 5 0 5 5 0 8 0 procpl 656 1176 0 1119 7 0 7 7 0 8 1 sosppl 168 5 0 5 1 0 1 1 0 8 1 sockpl 728 835 0 797 10 0 10 10 0 8 3 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 243 0 0 16 0 16 16 0 8 0 bufpl 280 2794 0 116 192 0 192 192 0 8 0 anonpl 32 7325 0 0 61 1 60 60 0 246 0 amapchunkpl 152 17743 0 17323 32 0 32 32 0 158 13 amappl16 200 1762 0 1741 5 2 3 5 0 8 1 amappl15 192 40 0 40 1 1 0 1 0 8 0 amappl14 184 121 0 109 1 0 1 1 0 8 0 amappl13 176 42 0 42 1 1 0 1 0 8 0 amappl12 168 1338 0 1307 2 0 2 2 0 8 0 amappl11 160 44 0 34 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 257 0 257 1 1 0 1 0 8 0 amappl8 136 20 0 18 1 0 1 1 0 8 0 amappl7 128 103 0 91 1 0 1 1 0 8 0 amappl6 120 184 0 179 1 0 1 1 0 8 0 amappl5 112 113 0 107 1 0 1 1 0 8 0 amappl4 104 404 0 387 1 0 1 1 0 8 0 amappl3 96 3103 0 3003 4 0 4 4 0 8 0 amappl2 88 677 0 610 2 0 2 2 0 8 0 amappl1 80 11336 0 10615 17 0 17 17 0 8 0 amappl 88 4869 0 4724 6 0 6 6 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 16 0 2 1 0 1 1 0 8 0 uaddrrnd 24 721 0 687 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 721 0 687 1 0 1 1 0 8 0 vmmpekpl 168 8536 0 8497 3 0 3 3 0 8 0 vmmpepl 168 53713 0 51583 105 0 105 105 0 357 6 vmsppl 480 720 0 687 7 1 6 6 0 8 1 rwobjpl 72 19226 0 15833 64 0 64 64 0 8 0 pdppl 4096 1450 0 1374 114 32 82 98 0 8 6 pvpl 32 15562 0 0 126 0 126 126 0 265 0 pmappl 256 720 0 687 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 412 0 35 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(ffffffff833e0740) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff838c2b90) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff838c2b90) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80087da030) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80087da030) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80087da030) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd80697c3ec8,0,ffff80002a3624b8,ffff80002a362494,0,2,802ab90ade59bcdb,ffff80002a362710) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff80002a3626d8,ffff80002a362710,ffff80002a362540,ffff80002a362548) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff80002a3626d8,ffff80002a362710,ffff80002a362650) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806c14f980,200000000000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff80002a362860,200000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002a362860) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7aa1cee29240, 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(ffffffff8395b708) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8395b708) at __mp_lock+0x192 sys/kern/kern_lock.c:144 vn_kqfilter(fffffd80626ee390,fffffd806a482bc8) at vn_kqfilter+0x35 sys/kern/vfs_vnops.c:626 kqueue_register(fffffd806ee601c0,ffff80002a3567b0,0,ffff8000ffff14a0) at kqueue_register+0xdb1 filter_attach sys/kern/kern_event.c:866 [inline] kqueue_register(fffffd806ee601c0,ffff80002a3567b0,0,ffff8000ffff14a0) at kqueue_register+0xdb1 sys/kern/kern_event.c:1348 pselregister(ffff8000ffff14a0,ffff80002a356a60,ffff800001438980,190,ffff80002a356ae4,0) at pselregister+0x135 sys/kern/sys_generic.c:760 dopselect(ffff8000ffff14a0,fc17,200000000100,2000000024c0,0,0,1360b74ff8eaf6a2,ffff8000ffff14a0) at dopselect+0x503 sys/kern/sys_generic.c:653 sys_select(ffff8000ffff14a0,ffff80002a356ce0,ffff80002a356c30) at sys_select+0x1e7 sys/kern/sys_generic.c:552 syscall(ffff80002a356ce0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a356ce0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x69289ceeb40, count: 4 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(ffffffff8395b708) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8395b708) at __mp_lock+0x192 sys/kern/kern_lock.c:144 vn_kqfilter(fffffd80626ee390,fffffd806a482bc8) at vn_kqfilter+0x35 sys/kern/vfs_vnops.c:626 kqueue_register(fffffd806ee601c0,ffff80002a3567b0,0,ffff8000ffff14a0) at kqueue_register+0xdb1 filter_attach sys/kern/kern_event.c:866 [inline] kqueue_register(fffffd806ee601c0,ffff80002a3567b0,0,ffff8000ffff14a0) at kqueue_register+0xdb1 sys/kern/kern_event.c:1348 pselregister(ffff8000ffff14a0,ffff80002a356a60,ffff800001438980,190,ffff80002a356ae4,0) at pselregister+0x135 sys/kern/sys_generic.c:760 dopselect(ffff8000ffff14a0,fc17,200000000100,2000000024c0,0,0,1360b74ff8eaf6a2,ffff8000ffff14a0) at dopselect+0x503 sys/kern/sys_generic.c:653 sys_select(ffff8000ffff14a0,ffff80002a356ce0,ffff80002a356c30) at sys_select+0x1e7 sys/kern/sys_generic.c:552 syscall(ffff80002a356ce0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a356ce0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x69289ceeb40, count: -11