uvm_fault(0xfffffd806ab783f0, 0x48, 0, 1) -> e kernel: page fault trap, code=0 Stopped at witness_checkorder+0xb5: movl 0x20(%r14),%r15d TID PID UID PRFLAGS PFLAGS CPU COMMAND 14665 38842 0 0x2 0x1 1 syz-executor witness_checkorder(28,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_unbind(ffff8000015a0830,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff80000161e000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(21e5f,2,2000,ffff80003c44d4f0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,2,2000,ffff80003c44d4f0) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c40a630) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ece7050,2,fffffd80097fd2d8,ffff80003c44d4f0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806cbae668,ffff80003c44d4f0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806cbae668,ffff80003c44d4f0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806cbae668,ffff80003c44d4f0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806cbae668,ffff80003c44d4f0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c44d4f0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c44d4f0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c44d4f0,ffff80003c40a9a0,ffff80003c40a8f0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c40a9a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c40a9a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 end trace frame: 0xffff80003c40aa20, count: 0 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: uvm_fault(0xfffffd806ab783f0, 0x48, 0, 1) -> e ddb{0}> trace witness_checkorder(28,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_unbind(ffff8000015a0830,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff80000161e000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(21e5f,2,2000,ffff80003c44d4f0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,2,2000,ffff80003c44d4f0) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c40a630) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ece7050,2,fffffd80097fd2d8,ffff80003c44d4f0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806cbae668,ffff80003c44d4f0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806cbae668,ffff80003c44d4f0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806cbae668,ffff80003c44d4f0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806cbae668,ffff80003c44d4f0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c44d4f0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c44d4f0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c44d4f0,ffff80003c40a9a0,ffff80003c40a8f0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c40a9a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c40a9a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f52b4cfc050, count: -15 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c40a450 rbx 0 rdx 0 rcx 0xffff80003c44d4f0 rax 0xffffffff83891ffe cpu_info_full_primary+0x1ffe r8 0 r9 0x1 r10 0xbefed7bf1632b5de r11 0x609fd3b4b8dda19f r12 0xfe r13 0x9 r14 0x28 r15 0 rip 0xffffffff82ffaa55 witness_checkorder+0xb5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c40a3b0 ss 0x10 witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{0}> show proc PROC (syz-executor) tid=76491 pid=82894 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c44d4f0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c44c2c8,0xffff800038fe9508 process=0xffff8000fffee1c8 user=0xffff80003c405000, vmspace=0xfffffd806ab783f0 estcpu=36, cpticks=9, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 48246 334858 88677 0 2 0 syz-executor 48246 7010 88677 0 3 0x4000080 fsleep syz-executor 65570 17941 83302 0 2 0 syz-executor 65570 123824 83302 0 3 0x4000080 fsleep syz-executor 72636 365370 25081 0 2 0 syz-executor 72636 231689 25081 0 3 0x4000080 fsleep syz-executor 96645 277648 60554 0 2 0 syz-executor 96645 96252 60554 0 3 0x4000080 fsleep syz-executor 80871 498417 97305 0 3 0x80 nanoslp syz-executor 80871 141727 97305 0 3 0x4000080 fsleep syz-executor 80871 478784 97305 0 3 0x4000080 lockf syz-executor 80871 177621 97305 0 3 0x4000080 fsleep syz-executor 83302 67291 79669 0 3 0x82 nanoslp syz-executor 97305 298018 79669 0 3 0x82 nanoslp syz-executor 38842 14665 79669 0 7 0x3 syz-executor 60554 214351 79669 0 3 0x82 nanoslp syz-executor 25081 347022 79669 0 3 0x82 nanoslp syz-executor 14984 137840 79669 0 2 0x2 syz-executor 88677 409155 79669 0 3 0x82 nanoslp syz-executor 43139 426257 79669 0 2 0x2 syz-executor 79669 129571 59578 0 3 0x82 kqread syz-executor 59578 354011 3719 0 3 0x10008a sigsusp ksh 3719 315596 13543 0 3 0x98 kqread sshd-session 13543 388569 94910 0 3 0x92 kqread sshd-session 16616 438502 1 0 3 0x100083 ttyopn getty 94910 372540 1 0 3 0x88 kqread sshd 11925 14592 79070 74 3 0x1100092 bpf pflogd 79070 287312 1 0 3 0x80 sbwait pflogd 82058 167966 4787 73 3 0x1100090 kqread syslogd 4787 481778 1 0 3 0x100082 sbwait syslogd 159 184983 1 0 3 0x100080 kqread resolvd 76282 427770 56379 77 3 0x100092 kqread dhcpleased 44917 309702 56379 77 3 0x100092 kqread dhcpleased 56379 140392 1 0 3 0x80 kqread dhcpleased 33973 215891 0 0 3 0x14200 bored smr 6090 345693 0 0 2 0x14200 zerothread 90417 397696 0 0 3 0x14200 aiodoned aiodoned 37818 91529 0 0 3 0x14200 syncer update 17792 124694 0 0 3 0x14200 cleaner cleaner 77048 380193 0 0 2 0x14200 reaper 61416 256514 0 0 3 0x14200 pgdaemon pagedaemon 69635 39840 0 0 3 0x14200 bored viomb 88184 305551 0 0 3 0x40014200 acpi0 acpi0 34853 463644 0 0 3 0x40014200 idle1 96549 148506 0 0 3 0x14200 bored softnet1 51501 511999 0 0 3 0x14200 bored softnet0 33114 380802 0 0 3 0x14200 bored systqmp 7548 461592 0 0 3 0x14200 bored systq 27815 301914 0 0 3 0x14200 tmoslp softclockmp 61730 164236 0 0 3 0x40014200 tmoslp softclock 8706 20453 0 0 3 0x40014200 idle0 1 510480 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 43139 (syz-executor) thread 0xffff8000ffffd9f8 (426257) exclusive rrwlock inode r = 0 (0xfffffd8075e33ef8) #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+0xbd sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806f88eea8) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11105 12144K 12226K 166960K 12744 0 pcb 18 14K 15K 166960K 180 0 rtable 207 14K 14K 166960K 619 0 pf 34 17K 19K 166960K 155 0 ifaddr 36 6K 7K 166960K 126 0 ifgroup 53 2K 2K 166960K 201 0 sysctl 4 1K 9K 166960K 19 0 counters 70 37K 38K 166960K 330 0 ioctlops 0 0K 4K 166960K 1774 0 iov 0 0K 40K 166960K 59 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1388 87K 89K 166960K 2047 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 101 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 93K 166960K 1032 0 sigio 0 0K 0K 166960K 18 0 proc 72 115K 164K 166960K 712 0 subproc 72 4K 4K 166960K 99 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 111 0 in_multi 63 4K 7K 166960K 181 0 ether_multi 1 0K 0K 166960K 8 0 mrt 1 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 929 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 243 168K 186K 166960K 11513 0 UVM aobj 8 12K 12K 166960K 9 0 pinsyscall 42 84K 102K 166960K 2289 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 72 0 NDP 12 0K 1K 166960K 87 0 temp 63 8679K 8926K 166960K 47173 0 kqueue 13 20K 30K 166960K 242 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 120 149 0 145 2 1 1 2 0 8 0 rtentry 176 176 0 100 6 0 6 6 0 8 0 unpcb 144 815 0 794 10 8 2 4 0 8 1 syncache 336 7 0 7 2 2 0 1 0 8 0 tcpqe 32 5 0 5 1 1 0 1 0 8 0 tcpcb 736 231 0 220 2 0 2 2 0 8 0 arp 136 27 0 13 1 0 1 1 0 8 0 inpcb 328 996 0 980 13 11 2 13 0 8 0 nd6 152 36 0 22 1 0 1 1 0 8 0 pkpcb 40 8 0 6 3 2 1 1 0 8 0 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1192 112 0 112 3 2 1 1 0 8 1 pppxif 1504 7 0 7 4 3 1 1 0 8 1 pffrag 232 9 0 1 1 0 1 1 0 482 0 pffrnode 88 9 0 1 1 0 1 1 0 8 0 pffrent 40 15 0 5 2 1 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 pfrktable 1344 2 0 2 2 2 0 1 0 8 0 pfrule 1360 1 0 1 1 1 0 1 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 6 0 1 6 1 5 5 0 8 0 art_heap4 256 730 0 422 31 10 21 29 0 8 1 art_table 40 736 0 423 5 0 5 5 0 8 0 art_node 32 175 0 107 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 8 1 0 1 1 0 8 0 semapl 112 32 0 22 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 3386 0 1878 96 0 96 96 0 8 0 ffsino 296 3386 0 1878 118 0 118 118 0 8 0 nchpl 144 4772 0 3056 64 0 64 64 0 8 0 rtmask 32 21 0 21 3 2 1 1 0 8 1 vnodes 216 3715 0 0 207 0 207 207 0 8 0 namei 1024 16452 0 16451 5 4 1 2 0 8 0 percpumem 16 180 0 130 1 0 1 1 0 8 0 vcpupl 3968 5 0 0 1 0 1 1 0 8 0 vmpool 848 6 0 1 1 0 1 1 0 8 0 kstatmem 264 132 0 104 3 0 3 3 0 8 0 scsiplug 72 2 0 2 2 2 0 1 0 8 0 scxspl 216 24490 0 24490 13 11 2 8 1 8 2 plimitpl 152 363 0 346 1 0 1 1 0 8 0 sigapl 424 1389 0 1342 9 3 6 8 0 8 0 knotepl 120 548 0 0 17 0 17 17 0 8 0 kqueuepl 224 391 0 382 6 4 2 3 0 8 1 pipepl 344 271 0 244 9 6 3 9 0 8 0 fdescpl 528 1333 0 1302 3 0 3 3 0 8 0 filepl 160 8161 0 7932 30 17 13 21 0 8 1 lockfpl 104 478 0 473 3 2 1 3 0 8 0 lockfspl 48 201 0 198 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 58 0 41 1 0 1 1 0 8 0 ucredpl 104 1475 0 1461 1 0 1 1 0 8 0 zombiepl 144 1577 0 1575 2 1 1 1 0 8 0 processpl 1232 1389 0 1342 6 2 4 6 0 8 0 procpl 664 2969 0 2913 8 2 6 8 0 8 0 sosppl 176 8 0 8 3 2 1 1 0 8 1 sockpl 752 1995 0 1952 35 27 8 18 0 8 3 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 294 0 0 18 0 18 18 0 8 0 bufpl 280 9635 0 3499 439 0 439 439 0 8 0 anonpl 32 11246 0 0 92 1 91 91 0 246 0 amapchunkpl 152 37589 0 37119 40 12 28 30 0 158 8 amappl16 200 4836 0 4800 41 26 15 27 0 8 7 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 29 0 29 1 1 0 1 0 8 0 amappl13 176 476 0 475 1 0 1 1 0 8 0 amappl12 168 1762 0 1720 3 0 3 3 0 8 0 amappl11 160 5 0 4 1 0 1 1 0 8 0 amappl10 152 64 0 50 1 0 1 1 0 8 0 amappl9 144 277 0 277 1 1 0 1 0 8 0 amappl8 136 29 0 27 1 0 1 1 0 8 0 amappl7 128 95 0 94 1 0 1 1 0 8 0 amappl6 120 317 0 304 1 0 1 1 0 8 0 amappl5 112 79 0 68 1 0 1 1 0 8 0 amappl4 104 461 0 431 1 0 1 1 0 8 0 amappl3 96 6559 0 6471 4 1 3 3 0 8 0 amappl2 88 1486 0 1408 2 0 2 2 0 8 0 amappl1 80 14001 0 13415 14 0 14 14 0 8 0 amappl 88 10529 0 10366 5 0 5 5 0 92 0 uvmvnodes 80 138 0 0 3 0 3 3 0 8 0 dma4096 4096 2 0 2 2 2 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 7 0 7 2 2 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 8 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1333 0 1302 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1333 0 1302 1 0 1 1 0 8 0 vmmpekpl 168 12740 0 12690 3 0 3 3 0 8 0 vmmpepl 168 92223 0 90304 113 15 98 105 0 357 4 vmsppl 488 1332 0 1302 5 0 5 5 0 8 0 rwobjpl 80 27230 0 26167 32 3 29 32 0 8 0 pdppl 4096 2685 0 2611 128 52 76 85 0 8 2 pvpl 32 17959 0 0 147 2 145 145 0 265 0 pmappl 256 1338 0 1303 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 320 0 73 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace witness_checkorder(28,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_unbind(ffff8000015a0830,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff80000161e000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(21e5f,2,2000,ffff80003c44d4f0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,2,2000,ffff80003c44d4f0) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c40a630) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ece7050,2,fffffd80097fd2d8,ffff80003c44d4f0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806cbae668,ffff80003c44d4f0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806cbae668,ffff80003c44d4f0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806cbae668,ffff80003c44d4f0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806cbae668,ffff80003c44d4f0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c44d4f0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c44d4f0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c44d4f0,ffff80003c40a9a0,ffff80003c40a8f0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c40a9a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c40a9a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f52b4cfc050, count: -15 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(ffffffff8394ba00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff8394ba00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 ktrstruct(ffff80002a2614d8,ffffffff834190c7,ffff80002a39eb50,10) at ktrstruct+0xdf sys/kern/kern_ktrace.c:313 sys_nanosleep(ffff80002a2614d8,ffff80002a39ec90,ffff80002a39ebe0) at sys_nanosleep+0x108 sys/kern/kern_time.c:294 syscall(ffff80002a39ec90) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a39ec90) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x722c275074a0, count: 7 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(ffffffff8394ba00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff8394ba00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 ktrstruct(ffff80002a2614d8,ffffffff834190c7,ffff80002a39eb50,10) at ktrstruct+0xdf sys/kern/kern_ktrace.c:313 sys_nanosleep(ffff80002a2614d8,ffff80002a39ec90,ffff80002a39ebe0) at sys_nanosleep+0x108 sys/kern/kern_time.c:294 syscall(ffff80002a39ec90) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a39ec90) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x722c275074a0, count: -8