witness: lock order reversal: 1st 0xffff8000013c6448 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd80739baf80 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff830be9a1 -> 0xffffffff8306b4aa is missing lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock) #0 rw_enter+0x122 #1 sblock+0xb7 sys/kern/uipc_socket2.c:549 #2 soreceive+0x295 sys/kern/uipc_socket.c:945 #3 fifo_read+0x11a sys/miscfs/fifofs/fifo_vnops.c:264 #4 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #5 vn_rdwr+0x15b #6 vndsetcred+0xa1 sys/dev/vnd.c:684 #7 vndioctl+0xe6c sys/dev/vnd.c:485 #8 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #9 vn_ioctl+0xf6 sys/kern/vfs_vnops.c:525 #10 sys_ioctl+0x67c #11 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #11 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #12 Xsyscall+0x128 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] sbufsnd (&so->so_snd.sb_lock) #0 rw_enter+0x122 #1 sblock+0xb7 sys/kern/uipc_socket2.c:549 #2 sosplice+0x3f4 sys/kern/uipc_socket.c:1454 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1228 #4 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #4 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd80739baf80,9,0) at witness_checkorder+0x1047 rw_enter(fffffd80739baf70,1) at rw_enter+0x122 rrw_enter(fffffd80739baf70,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd807e227c08,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd807e227c08,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800036ba0878) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800036ba0878) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff8000013c62a0,fffffd806ee10e00,ffff80002a055bf8) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff8000013c62a0,fffffd806ee10f00,fffffd806ee10e00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff8000013c62a0,fffffd806ee10e00,ffff800036ba0b08,0,0,0) at sosend+0xa40 sendit(ffff80002a055bf8,3,ffff800036ba0c80,0,ffff800036ba0d40) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff80002a055bf8,ffff800036ba0df0,ffff800036ba0d40) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800036ba0df0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800036ba0df0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x489f4053200, count: -15 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff800036ba04d0 rbx 0xfffffd80042c3ac0 rdx 0xffff80000128e9c0 rcx 0xffff80002a055bf8 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff800036ba03b0 r9 0x8080808080808080 r10 0xf7c62c1dfdf30ad9 r11 0xd682500ddd206b66 r12 0 r13 0xfffffd8003adae00 r14 0x3 r15 0xffffffff rip 0xffffffff81610e15 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800036ba04c0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=464445 pid=7073 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a0542a8,0xffffffff835f1e20 process=0xffff8000ffff5b48 user=0xffff800036b9b000, vmspace=0xfffffd806bf291e0 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 7073 357429 68054 0 3 0x80 fsleep syz-executor * 7073 464445 68054 0 7 0x4000000 syz-executor 19697 213049 15293 0 3 0x80 fsleep syz-executor 19697 297354 15293 0 3 0x4000080 sbwait syz-executor 12502 518852 42887 0 3 0x80 fsleep syz-executor 12502 469275 42887 0 3 0x4000000 biowait syz-executor 8045 170137 10167 0 3 0x80 fsleep syz-executor 8045 294234 10167 0 3 0x4000080 sbwait syz-executor 8368 77797 82255 0 3 0x80 fsleep syz-executor 8368 129330 82255 0 3 0x4000080 sbwait syz-executor 44433 386012 57003 0 3 0x80 fsleep syz-executor 44433 144741 57003 0 3 0x4000080 nanoslp syz-executor 74445 329658 4271 0 3 0x80 fsleep syz-executor 74445 76236 4271 0 3 0x4000080 sbwait syz-executor 43308 202230 5818 0 3 0x80 fsleep syz-executor 43308 198953 5818 0 3 0x4000080 kqread syz-executor 57003 471681 8948 0 3 0x82 nanoslp syz-executor 61680 39420 1 0 3 0x100083 ttyin getty 4271 463890 8948 0 3 0x82 nanoslp syz-executor 26693 126287 0 0 3 0x14200 bored sosplice 42887 197316 8948 0 3 0x82 nanoslp syz-executor 82255 502211 8948 0 3 0x82 nanoslp syz-executor 10167 152093 8948 0 3 0x82 nanoslp syz-executor 5818 175468 8948 0 3 0x82 nanoslp syz-executor 15293 275651 8948 0 3 0x82 nanoslp syz-executor 68054 29073 8948 0 3 0x82 nanoslp syz-executor 8948 394060 24526 0 3 0x82 kqread syz-executor 24526 356520 66258 0 3 0x10008a sigsusp ksh 66258 140382 23377 0 3 0x98 kqread sshd-session 23377 186682 72570 0 3 0x92 kqread sshd-session 72570 182103 1 0 3 0x88 kqread sshd 48216 364953 18616 74 3 0x1100092 bpf pflogd 18616 205176 1 0 3 0x80 sbwait pflogd 51613 524243 4372 73 3 0x1100090 kqread syslogd 4372 504822 1 0 3 0x100082 sbwait syslogd 52652 162198 1 0 3 0x100080 kqread resolvd 56545 419595 81905 77 3 0x100092 kqread dhcpleased 68356 29025 81905 77 3 0x100092 kqread dhcpleased 81905 204657 1 0 3 0x80 kqread dhcpleased 56559 313715 0 0 3 0x14200 bored smr 31865 395847 0 0 3 0x14200 pgzero zerothread 36989 442255 0 0 3 0x14200 aiodoned aiodoned 56243 210034 0 0 3 0x14200 syncer update 44515 56035 0 0 3 0x14200 cleaner cleaner 72949 273902 0 0 3 0x14200 reaper reaper 5485 506782 0 0 3 0x14200 pgdaemon pagedaemon 61413 413415 0 0 3 0x14200 bored viomb 43027 51832 0 0 3 0x40014200 acpi0 acpi0 68430 40692 0 0 7 0x40014200 idle1 42278 363462 0 0 3 0x14200 bored softnet3 71422 42583 0 0 3 0x14200 bored softnet2 20827 374789 0 0 3 0x14200 bored softnet1 21802 248997 0 0 3 0x14200 bored softnet0 34965 56426 0 0 3 0x14200 bored systqmp 18531 422321 0 0 3 0x14200 bored systq 68615 372633 0 0 3 0x14200 tmoslp softclockmp 38827 385604 0 0 3 0x40014200 tmoslp softclock 13356 416125 0 0 3 0x40014200 idle0 1 397089 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 7073 (syz-executor) thread 0xffff80002a055bf8 (464445) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8359d538) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 __mp_acquire_count+0x58 #2 mi_switch+0x4b7 sys/kern/sched_bsd.c:441 #3 yield+0x6a sys/kern/sched_bsd.c:320 #4 pool_get+0x242 sys/kern/subr_pool.c:589 #5 namei+0xdf sys/kern/vfs_lookup.c:145 #6 unp_connect+0x27d sys/kern/uipc_usrreq.c:868 #7 uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 #8 sosend+0xa40 #9 sendit+0x721 sys/kern/uipc_syscalls.c:786 #10 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 #11 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #11 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #12 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff8000013c6448) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 sblock+0xb7 sys/kern/uipc_socket2.c:549 #3 sosend+0x2ff sys/kern/uipc_socket.c:681 #4 sendit+0x721 sys/kern/uipc_syscalls.c:786 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 #6 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 12502 (syz-executor) thread 0xffff8000371cecd0 (469275) exclusive rrwlock inode r = 0 (0xfffffd806dd36e70) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vn_write+0x18d sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x23c sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #8 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10233 11384K 11574K 166960K 13708 0 pcb 17 14K 16K 166960K 261 0 rtable 219 6K 7K 166960K 511 0 pf 41 19K 21K 166960K 99 0 ifaddr 43 7K 8K 166960K 76 0 ifgroup 63 2K 2K 166960K 116 0 sysctl 4 1K 1K 166960K 4 0 counters 66 36K 36K 166960K 102 0 ioctlops 0 0K 4K 166960K 1565 0 iov 2 4K 20K 166960K 140 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1432 90K 91K 166960K 2716 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 17 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 48 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 93K 166960K 1423 0 sigio 1 0K 0K 166960K 23 0 proc 73 91K 140K 166960K 719 0 subproc 104 6K 6K 166960K 130 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 230 0 in_multi 98 7K 7K 166960K 179 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 199 890K 890K 166960K 199 0 exec 0 0K 1K 166960K 970 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 243 73K 87K 166960K 14874 0 UVM aobj 37 2K 2K 166960K 42 0 pinsyscall 43 86K 104K 166960K 2605 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 76 0 NDP 13 0K 2K 166960K 53 0 temp 73 6828K 6897K 166960K 72656 0 kqueue 14 22K 30K 166960K 212 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 134 0 131 1 0 1 1 0 8 0 rtentry 112 160 0 59 4 0 4 4 0 8 0 unpcb 144 867 0 839 8 6 2 6 0 8 0 syncache 336 7 0 7 3 3 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 364 0 357 9 7 2 7 0 8 1 arp 120 29 0 12 1 0 1 1 0 8 0 inpcb 336 1377 0 1367 13 11 2 7 0 8 1 nd6 136 35 0 7 1 0 1 1 0 8 0 pkpcb 40 5 0 5 3 3 0 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1168 11 0 11 4 3 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 11 0 2 1 0 1 1 0 482 0 pffrnode 88 11 0 2 1 0 1 1 0 8 0 pffrent 40 15 0 6 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 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfstitem 24 93 0 39 1 0 1 1 0 8 0 pfstkey 128 95 0 41 2 0 2 2 0 8 0 pfstate 376 93 0 40 6 0 6 6 0 8 0 pfrule 1344 23 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 653 0 202 32 3 29 31 0 8 0 art_table 32 654 0 202 4 0 4 4 0 8 0 art_node 16 157 0 69 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 3 2 1 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 44 0 34 1 0 1 1 0 8 0 shmpl 112 39 0 5 1 0 1 1 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 3960 0 2455 95 0 95 95 0 8 0 ffsino 272 3960 0 2455 102 1 101 102 0 8 0 nchpl 144 5986 0 4297 64 0 64 64 0 8 0 uvmvnodes 80 4824 0 0 99 0 99 99 0 8 0 vnodes 216 4824 0 0 268 0 268 268 0 8 0 namei 1024 19858 0 19857 1 0 1 1 0 8 0 percpumem 16 65 0 18 1 0 1 1 0 8 0 kstatmem 264 62 0 36 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 9 0 9 7 6 1 1 0 8 1 scxspl 216 20793 0 20792 18 17 1 8 1 8 0 plimitpl 152 166 0 148 1 0 1 1 0 8 0 sigapl 424 1754 0 1703 8 2 6 8 0 8 0 futexpl 64 22988 0 22980 1 0 1 1 0 8 0 knotepl 120 585 0 0 17 0 17 17 0 8 0 kqueuepl 216 347 0 337 1 0 1 1 0 8 0 pipepl 320 217 0 189 3 0 3 3 0 8 0 fdescpl 496 1715 0 1683 5 0 5 5 0 8 0 filepl 152 10349 0 10086 23 11 12 17 0 8 0 lockfpl 104 427 0 424 2 1 1 2 0 8 0 lockfspl 48 159 0 156 1 0 1 1 0 8 0 sessionpl 144 30 0 21 1 0 1 1 0 8 0 pgrppl 48 51 0 34 1 0 1 1 0 8 0 ucredpl 104 2116 0 2103 1 0 1 1 0 8 0 zombiepl 144 1731 0 1731 2 1 1 1 0 8 1 processpl 1160 1754 0 1703 6 2 4 6 0 8 0 procpl 648 3828 0 3769 8 2 6 8 0 8 0 srpgc 96 16 0 16 3 3 0 1 0 8 0 sosppl 168 10 0 10 2 2 0 1 0 8 0 sockpl 664 2400 0 2359 21 16 5 15 0 8 0 mcl64k 65536 14 0 0 2 0 2 2 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 159 0 0 20 0 20 20 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 36 0 0 1 0 1 1 0 8 0 mbufpl 256 232 0 0 13 0 13 13 0 8 0 bufpl 280 7285 0 1111 442 0 442 442 0 8 0 anonpl 24 308783 0 302571 126 46 80 80 0 185 39 amapchunkpl 152 48873 0 48304 35 9 26 30 0 158 0 amappl16 200 8068 0 7939 59 38 21 28 0 8 14 amappl15 192 55 0 55 1 1 0 1 0 8 0 amappl14 184 150 0 138 1 0 1 1 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 2411 0 2379 3 1 2 2 0 8 0 amappl11 160 55 0 41 1 0 1 1 0 8 0 amappl10 152 11 0 11 2 2 0 1 0 8 0 amappl9 144 128 0 128 1 1 0 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 132 0 119 1 0 1 1 0 8 0 amappl6 120 193 0 191 1 0 1 1 0 8 0 amappl5 112 151 0 139 1 0 1 1 0 8 0 amappl4 104 347 0 326 1 0 1 1 0 8 0 amappl3 96 9136 0 9039 3 0 3 3 0 8 0 amappl2 88 2048 0 1963 3 0 3 3 0 8 0 amappl1 80 12651 0 12080 14 0 14 14 0 8 0 amappl 88 14381 0 14201 6 1 5 5 0 92 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 128 256 0 256 4 4 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 30 0 29 1 0 1 1 0 8 0 aobjpl 72 41 0 5 1 0 1 1 0 8 0 uaddrrnd 24 1715 0 1683 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1715 0 1683 1 0 1 1 0 8 0 vmmpekpl 168 14518 0 14478 3 0 3 3 0 8 0 vmmpepl 168 112620 0 110597 136 30 106 106 0 357 12 vmsppl 448 1714 0 1683 6 2 4 5 0 8 0 rwobjpl 56 37944 0 32046 91 3 88 88 0 8 2 pdppl 4096 3437 0 3366 123 52 71 85 0 8 0 pvpl 32 20782 0 0 168 1 167 167 0 265 0 pmappl 248 1714 0 1683 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 437 0 85 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:437 witness_checkorder(fffffd80739baf80,9,0) at witness_checkorder+0x1047 rw_enter(fffffd80739baf70,1) at rw_enter+0x122 rrw_enter(fffffd80739baf70,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd807e227c08,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd807e227c08,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800036ba0878) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800036ba0878) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff8000013c62a0,fffffd806ee10e00,ffff80002a055bf8) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff8000013c62a0,fffffd806ee10f00,fffffd806ee10e00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff8000013c62a0,fffffd806ee10e00,ffff800036ba0b08,0,0,0) at sosend+0xa40 sendit(ffff80002a055bf8,3,ffff800036ba0c80,0,ffff800036ba0d40) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff80002a055bf8,ffff800036ba0df0,ffff800036ba0d40) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800036ba0df0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800036ba0df0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x489f4053200, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffff800029b7bff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5