t=zґP7JOr=tGs0(@fo(^o#TJ8۽;+)witness: lock order reversal: 1st 0xffffffff8392cac0 &sched_lock (&sched_lock) 2nd 0xffff8000299dee30 &cq->cq_mtx (&cq->cq_mtx) lock order [1] &sched_lock (&sched_lock) -> [2] &cq->cq_mtx (&cq->cq_mtx) #0 mtx_enter+0x95 sys/kern/kern_lock.c:406 #1 clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 #2 mi_switch+0x187 sys/kern/sched_bsd.c:376 #3 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #4 sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline] #4 sys_futex+0xb90 sys/kern/sys_futex.c:155 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 lock order [2] &cq->cq_mtx (&cq->cq_mtx) -> [1] &sched_lock (&sched_lock) #0 mtx_enter+0x95 sys/kern/kern_lock.c:406 #1 sleep_setup+0xed sys/kern/kern_synch.c:304 #2 msleep_nsec+0x10b sys/kern/kern_synch.c:217 #3 dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 #4 dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #4 dtclose+0x109 sys/dev/dt/dt_dev.c:239 #5 spec_close+0x466 sys/kern/spec_vnops.c:-1 #6 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #7 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #7 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #8 fdrop+0x121 sys/kern/kern_descrip.c:1280 #9 closef+0x192 sys/kern/kern_descrip.c:1264 #10 fdfree+0x116 sys/kern/kern_descrip.c:1195 #11 exit1+0x576 sys/kern/kern_exit.c:215 #12 sys_exit+0x1a sys/kern/kern_exit.c:-1 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(ffff8000299dee30,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffff8000299dee20) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_cancel(ffff8000299de2f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 mi_switch() at mi_switch+0x187 sys/kern/sched_bsd.c:376 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 sys_futex(ffff8000393fcfb0,ffff80003c463750,ffff80003c4636a0) at sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline] sys_futex(ffff8000393fcfb0,ffff80003c463750,ffff80003c4636a0) at sys_futex+0xb90 sys/kern/sys_futex.c:155 syscall(ffff80003c463750) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c463750) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd2db5466fe0, count: -9 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c463320 rbx 0 rdx 0xffff800001563ac0 rcx 0xffff8000393fcfb0 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c463200 r9 0x8080808080808080 r10 0x172069b5ae422137 r11 0x770890cd3f3b3722 r12 0xfffffd8003f49300 r13 0xfffffd8004739d58 r14 0x3 r15 0xffffffff8342440c substchar+0xe0b0 rip 0xffffffff82de7905 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c463310 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=173213 pid=10005 tcnt=2 stat=sleep flags process=4000000 proc=4000080 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0xffff80003c4635c0, wmesg=fsleep, ps_single=0x0 scnt=0 ecnt=0 forw=0x0, list=0xffff8000393fc7e8,0xffffffff83932170 process=0xffff8000393e9d00 user=0xffff80003c45e000, vmspace=0xfffffd800d407208 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 10005 405189 47086 0 7 0x4000000 syz-executor *10005 173213 47086 0 3 0x4000080 fsleep syz-executor 57469 227255 19675 0 2 0x10 syz-executor 57469 172101 19675 0 3 0x4000090 fsleep syz-executor 58184 372704 47954 0 3 0x80 nanoslp syz-executor 58184 441438 47954 0 3 0x4000000 smrbar syz-executor 34353 325693 27597 0 3 0x80 nanoslp syz-executor 34353 206180 27597 0 3 0x4000080 msgwait syz-executor 34353 274980 27597 0 3 0x4000080 fsleep syz-executor 36472 430918 98405 0 2 0 syz-executor 36472 481658 98405 0 3 0x4000080 fsleep syz-executor 36472 266053 98405 0 3 0x4000080 fsleep syz-executor 76977 482952 14312 0 3 0x80 nanoslp syz-executor 76977 218435 14312 0 3 0x4000080 ttyout syz-executor 76977 45264 14312 0 3 0x4000080 fsleep syz-executor 37550 162029 42356 0 3 0x3000 suspend syz-executor 37550 166828 42356 0 3 0x4081000 biowait syz-executor 19675 233229 76746 0 3 0x82 nanoslp syz-executor 42356 14856 76746 0 3 0x82 nanoslp syz-executor 27597 389949 76746 0 3 0x82 nanoslp syz-executor 14312 326926 76746 0 3 0x82 nanoslp syz-executor 47086 3014 76746 0 3 0x82 nanoslp syz-executor 47954 517977 76746 0 3 0x82 nanoslp syz-executor 98405 113837 76746 0 3 0x82 nanoslp syz-executor 94435 482536 76746 0 3 0x2 biowait syz-executor 76746 308424 23348 0 3 0x82 kqread syz-executor 23348 156085 94534 0 3 0x10008a sigsusp ksh 94534 269338 92448 0 3 0x98 kqread sshd-session 92448 354048 4988 0 3 0x92 kqread sshd-session 9344 41297 1 0 3 0x100083 ttyopn getty 4988 134822 1 0 3 0x88 kqread sshd 399 255105 6949 74 3 0x1100092 bpf pflogd 6949 70266 1 0 3 0x80 sbwait pflogd 230 123958 23704 73 3 0x1100090 kqread syslogd 23704 247360 1 0 3 0x100082 sbwait syslogd 37388 121513 1 0 3 0x100080 kqread resolvd 65215 336061 90096 77 3 0x100092 kqread dhcpleased 39831 501970 90096 77 3 0x100092 kqread dhcpleased 90096 167904 1 0 3 0x80 kqread dhcpleased 53373 136235 0 0 3 0x14200 bored smr 73203 146653 0 0 2 0x14200 zerothread 89687 76341 0 0 3 0x14200 aiodoned aiodoned 23319 255635 0 0 3 0x14200 syncer update 52595 7652 0 0 3 0x14200 cleaner cleaner 45752 17699 0 0 3 0x14200 reaper reaper 20696 423542 0 0 3 0x14200 pgdaemon pagedaemon 68513 336914 0 0 3 0x14200 bored viomb 6378 288788 0 0 3 0x40014200 acpi0 acpi0 96162 300557 0 0 3 0x40014200 idle1 6148 269582 0 0 3 0x14200 bored softnet1 64364 2557 0 0 3 0x14200 bored softnet0 8255 221962 0 0 3 0x14200 bored systqmp 21585 398662 0 0 3 0x14200 bored systq 98541 94130 0 0 3 0x14200 tmoslp softclockmp 3756 159732 0 0 3 0x40014200 tmoslp softclock 44577 510361 0 0 3 0x40014200 idle0 1 175923 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff8392cac0) #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+0x4b4 sys/kern/kern_lock.c:487 #2 sleep_finish+0x1d6 sys/kern/kern_synch.c:357 #3 sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline] #3 sys_futex+0xb90 sys/kern/sys_futex.c:155 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #5 Xsyscall+0x128 Process 10005 (syz-executor) thread 0xffff8000393fc7e8 (405189) exclusive rwlock futexlk r = 0 (0xffffffff839385e8) #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 futex_wake+0xbc sys/kern/sys_futex.c:467 #3 sys_futex+0x1d9 sys/kern/sys_futex.c:158 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #5 Xsyscall+0x128 Process 58184 (syz-executor) thread 0xffff8000fffef240 (441438) exclusive rwlock clonelk r = 0 (0xffffffff8384c4b8) #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 if_clone_destroy+0x93 sys/net/if.c:-1 #3 ifioctl+0x59d sys/net/if.c:2159 #4 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 Process 37550 (syz-executor) thread 0xffff8000393fca80 (166828) exclusive rrwlock inode r = 0 (0xfffffd806610ea20) #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 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 94435 (syz-executor) thread 0xffff8000ffffd760 (482536) exclusive rrwlock inode r = 0 (0xfffffd8069afa210) #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 (0xfffffd806f851d80) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11075 12139K 12416K 166960K 12364 0 pcb 17 12K 12K 166960K 56 0 rtable 246 8K 8K 166960K 384 0 pf 34 17K 81K 166960K 53 0 ifaddr 43 7K 7K 166960K 55 0 ifgroup 55 2K 2K 166960K 67 0 sysctl 1 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 84 0 ioctlops 0 0K 4K 166960K 1551 0 iov 0 0K 12K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1345 85K 85K 166960K 1542 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 3K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 7 0 dirhash 12 2K 3K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 298 0 sigio 0 0K 0K 166960K 1 0 proc 72 115K 147K 166960K 552 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 0 0K 0K 166960K 20 0 in_multi 99 7K 7K 166960K 112 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 402 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 255 188K 189K 166960K 4823 0 UVM aobj 4 4K 6K 166960K 5 0 pinsyscall 42 84K 108K 166960K 1467 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 1K 166960K 11 0 NDP 12 0K 2K 166960K 36 0 temp 44 8668K 8736K 166960K 10334 0 kqueue 15 24K 28K 166960K 49 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 49 0 46 1 0 1 1 0 8 0 rtentry 176 113 0 3 6 0 6 6 0 8 1 unpcb 144 127 0 110 2 0 2 2 0 8 1 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 38 0 32 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 183 0 170 2 0 2 2 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 7 0 7 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 2 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 rttmr 136 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 515 0 62 31 0 31 31 0 8 2 art_table 40 516 0 62 5 0 5 5 0 8 0 art_node 32 113 0 13 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 1 1 0 1 1 0 8 0 semapl 112 5 0 2 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 1957 0 436 96 0 96 96 0 8 0 ffsino 296 1957 0 436 118 0 118 118 0 8 0 nchpl 144 2361 0 656 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 vnodes 216 2095 0 0 117 0 117 117 0 8 0 namei 1024 7438 0 7437 2 0 2 2 0 8 1 percpumem 16 57 0 7 1 0 1 1 0 8 0 vcpupl 3968 1 0 0 1 0 1 1 0 8 0 vmpool 848 2 0 1 1 0 1 1 0 8 0 kstatmem 264 38 0 12 3 0 3 3 0 8 1 scxspl 216 9496 0 9494 3 2 1 2 1 8 0 plimitpl 152 56 0 36 1 0 1 1 0 8 0 sigapl 424 620 0 573 7 0 7 7 0 8 1 knotepl 120 313 0 0 10 0 10 10 0 8 0 kqueuepl 224 58 0 47 1 0 1 1 0 8 0 pipepl 344 139 0 112 3 0 3 3 0 8 0 fdescpl 528 603 0 572 3 0 3 3 0 8 0 filepl 160 2669 0 2432 13 0 13 13 0 8 2 lockfpl 104 46 0 41 1 0 1 1 0 8 0 lockfspl 48 24 0 20 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 35 0 18 1 0 1 1 0 8 0 ucredpl 104 463 0 449 1 0 1 1 0 8 0 zombiepl 144 574 0 573 1 0 1 1 0 8 0 processpl 1232 620 0 573 5 0 5 5 0 8 0 procpl 664 907 0 850 6 0 6 6 0 8 0 sockpl 752 373 0 340 5 0 5 5 0 8 0 mcl64k 65536 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 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 155 0 0 10 0 10 10 0 8 0 bufpl 280 3709 0 133 256 0 256 256 0 8 0 anonpl 32 8596 0 0 70 0 70 70 0 246 0 amapchunkpl 152 14511 0 13883 29 0 29 29 0 158 1 amappl16 200 2254 0 2089 10 1 9 9 0 8 0 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 10 0 10 2 2 0 1 0 8 0 amappl13 176 438 0 437 1 0 1 1 0 8 0 amappl12 168 974 0 932 3 0 3 3 0 8 0 amappl11 160 14 0 14 2 2 0 1 0 8 0 amappl10 152 51 0 36 1 0 1 1 0 8 0 amappl9 144 250 0 249 1 0 1 1 0 8 0 amappl8 136 49 0 47 1 0 1 1 0 8 0 amappl7 128 85 0 84 1 0 1 1 0 8 0 amappl6 120 297 0 284 1 0 1 1 0 8 0 amappl5 112 81 0 71 1 0 1 1 0 8 0 amappl4 104 433 0 403 1 0 1 1 0 8 0 amappl3 96 2285 0 2187 4 1 3 3 0 8 0 amappl2 88 733 0 657 2 0 2 2 0 8 0 amappl1 80 10230 0 9637 15 0 15 15 0 8 1 amappl 88 4028 0 3853 5 0 5 5 0 92 0 uvmvnodes 80 106 0 0 3 0 3 3 0 8 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 4 0 1 1 0 1 1 0 8 0 uaddrrnd 24 603 0 572 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 603 0 572 1 0 1 1 0 8 0 vmmpekpl 168 6786 0 6748 2 0 2 2 0 8 0 vmmpepl 168 46743 0 44678 93 0 93 93 0 357 0 vmsppl 488 602 0 572 5 0 5 5 0 8 0 rwobjpl 80 16011 0 14832 25 0 25 25 0 8 0 pdppl 4096 1218 0 1147 104 30 74 88 0 8 3 pvpl 32 18017 0 0 148 1 147 147 0 265 1 pmappl 256 604 0 573 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 275 0 32 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff837d6ff0) 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 mtx_enter(ffffffff8392cab0) at mtx_enter+0x377 sys/kern/kern_lock.c:454 futex_wake(ffff8000393fc7e8,d2da7c20c60,7fffffff,80,ffff80003c43bcf0) at futex_wake+0x245 futex_list_wakeup sys/kern/sys_futex.c:345 [inline] futex_wake(ffff8000393fc7e8,d2da7c20c60,7fffffff,80,ffff80003c43bcf0) at futex_wake+0x245 sys/kern/sys_futex.c:482 sys_futex(ffff8000393fc7e8,ffff80003c43bda0,ffff80003c43bcf0) at sys_futex+0x1d9 sys/kern/sys_futex.c:158 syscall(ffff80003c43bda0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c43bda0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x750769020f40, count: -8 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(ffff8000299dee30,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffff8000299dee20) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_cancel(ffff8000299de2f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 mi_switch() at mi_switch+0x187 sys/kern/sched_bsd.c:376 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 sys_futex(ffff8000393fcfb0,ffff80003c463750,ffff80003c4636a0) at sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline] sys_futex(ffff8000393fcfb0,ffff80003c463750,ffff80003c4636a0) at sys_futex+0xb90 sys/kern/sys_futex.c:155 syscall(ffff80003c463750) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c463750) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd2db5466fe0, count: -9