witness: lock order reversal: 1st 0xffff8000014c9950 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd80662e5210 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff832f8018 -> 0xffffffff83343bfc is missing lock order [2] inode (&ip->i_lock) -> [1] sbufrcv (&so->so_rcv.sb_lock) #0 rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 #1 sblock+0xb6 sys/kern/uipc_socket2.c:536 #2 soreceive+0x27d sys/kern/uipc_socket.c:870 #3 fifo_read+0x117 sys/miscfs/fifofs/fifo_vnops.c:264 #4 VOP_READ+0x101 sys/kern/vfs_vops.c:227 #5 vn_rdwr+0x15b sys/kern/vfs_vnops.c:-1 #6 vndsetcred+0xa1 sys/dev/vnd.c:684 #7 vndioctl+0xdfe sys/dev/vnd.c:485 #8 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #9 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #10 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #11 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #12 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:438 witness_checkorder(fffffd80662e5210,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd80662e51f8,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd80662e51f8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd805b51a130,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd805b51a130,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805b51a130,fffffd805b51a130,0,0,200,0,f391a0769f7cc43) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805b51a130,fffffd805b51a130,ffff80003c44f790) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806eca5100,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff8000014c9860,ffff80002a30c538,ffff80002a30c4e8,0,ffff80002a30c520,ffff80002a30c6ac,fa1ffb33516b552a) at soreceive+0xc24 sys/kern/uipc_socket.c:1009 recvit(ffff80003c44f790,4,ffff80002a30c680,0,ffff80002a30c730) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff80003c44f790,ffff80002a30c7e0,ffff80002a30c730) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff80002a30c7e0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a30c7e0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x240cf470ce0, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80002a30bfd0 rbx 0 rdx 0xffff800001472580 rcx 0xffff80003c44f790 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80002a30beb0 r9 0x8080808080808080 r10 0x5681fd558784313d r11 0xab915ab7ac9811f r12 0xfffffd8003ef7640 r13 0xfffffd80046de7a0 r14 0x3 r15 0xffffffff833dadbe substchar+0xb292 rip 0xffffffff81d6b285 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a30bfc0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=171999 pid=48616 tcnt=2 stat=onproc flags process=1000000 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c44e2d0,0xffffffff838a2ac8 process=0xffff8000ffff39d0 user=0xffff80002a307000, vmspace=0xfffffd80689d3d80 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 48616 24489 28244 0 2 0x1000000 syz-executor *48616 171999 28244 0 7 0x5000000 syz-executor 6570 456107 54001 0 2 0 syz-executor 6570 116155 54001 0 3 0x4000080 ttyin syz-executor 64541 507128 82371 0 3 0x80 nanoslp syz-executor 64541 64479 82371 0 2 0x4000000 syz-executor 64541 450373 82371 0 3 0x4000080 fsleep syz-executor 53068 217301 0 0 3 0x14200 acct acct 64648 173463 55439 0 3 0x80 nanoslp syz-executor 64648 513961 55439 0 3 0x4000080 sbwait syz-executor 64648 439523 55439 0 3 0x4000080 fsleep syz-executor 86444 433881 52939 0 3 0x90 nanoslp syz-executor 86444 127054 52939 0 3 0x4000090 ttyin syz-executor 86444 363674 52939 0 3 0x4000090 fsleep syz-executor 86444 438670 52939 0 3 0x4000090 fsleep syz-executor 22672 130698 1 0 3 0x82 nanoslp getty 96866 325181 2293 0 3 0x82 nanoslp syz-executor 54001 310987 2293 0 3 0x82 nanoslp syz-executor 82371 76010 2293 0 3 0x82 nanoslp syz-executor 97183 381032 0 0 3 0x14280 nfsidl nfsio 92611 257101 0 0 3 0x14280 nfsidl nfsio 93977 252535 0 0 3 0x14280 nfsidl nfsio 38786 512411 0 0 3 0x14280 nfsidl nfsio 88472 299251 0 0 3 0x14280 nfsidl nfsio 44704 358762 0 0 3 0x14280 nfsidl nfsio 33976 98599 0 0 3 0x14280 nfsidl nfsio 84494 406623 0 0 3 0x14280 nfsidl nfsio 78901 49841 0 0 3 0x14280 nfsidl nfsio 49499 121528 0 0 3 0x14280 nfsidl nfsio 59851 185143 0 0 3 0x14280 nfsidl nfsio 82184 453050 0 0 3 0x14280 nfsidl nfsio 49624 277665 0 0 3 0x14280 nfsidl nfsio 45675 397804 0 0 3 0x14280 nfsidl nfsio 64313 383892 0 0 3 0x14280 nfsidl nfsio 11677 58168 0 0 3 0x14280 nfsidl nfsio 3095 246074 0 0 3 0x14280 nfsidl nfsio 23693 298509 0 0 3 0x14280 nfsidl nfsio 5526 23935 0 0 3 0x14280 nfsidl nfsio 94794 110944 0 0 3 0x14280 nfsidl nfsio 39348 140618 2293 0 3 0x82 nanoslp syz-executor 63042 365228 0 0 3 0x14200 bored sosplice 3552 13367 2293 0 3 0x82 piperd syz-executor 28244 437007 2293 0 3 0x82 nanoslp syz-executor 52939 359957 2293 0 3 0x82 nanoslp syz-executor 55439 441368 2293 0 3 0x82 nanoslp syz-executor 2293 345519 34979 0 2 0x2 syz-executor 34979 147034 68327 0 3 0x10008a sigsusp ksh 68327 397456 44880 0 3 0x98 kqread sshd-session 44880 112866 87665 0 3 0x92 kqread sshd-session 87665 138403 1 0 3 0x88 kqread sshd 15954 62216 39537 74 3 0x1100092 bpf pflogd 39537 202630 1 0 3 0x80 sbwait pflogd 80963 518640 21310 73 3 0x1100090 kqread syslogd 21310 459836 1 0 3 0x100082 sbwait syslogd 87749 29825 1 0 3 0x100080 kqread resolvd 48931 122044 20009 77 3 0x100092 kqread dhcpleased 65574 407064 20009 77 3 0x100092 kqread dhcpleased 20009 75140 1 0 3 0x80 kqread dhcpleased 56019 425539 0 0 3 0x14200 bored smr 11770 249701 0 0 2 0x14200 zerothread 5109 371497 0 0 3 0x14200 aiodoned aiodoned 69370 340820 0 0 3 0x14200 syncer update 68791 302683 0 0 3 0x14200 cleaner cleaner 85170 358210 0 0 3 0x14200 reaper reaper 72746 363395 0 0 3 0x14200 pgdaemon pagedaemon 67673 72894 0 0 3 0x14200 bored viomb 39117 211998 0 0 3 0x40014200 acpi0 acpi0 90960 59148 0 0 7 0x40014200 idle1 69912 396054 0 0 3 0x14200 bored softnet1 16000 224030 0 0 3 0x14200 bored softnet0 67387 469916 0 0 3 0x14200 bored systqmp 63023 356477 0 0 3 0x14200 bored systq 88599 195029 0 0 3 0x14200 tmoslp softclockmp 73047 111639 0 0 3 0x40014200 tmoslp softclock 27466 317424 0 0 3 0x40014200 idle0 1 307057 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 48616 (syz-executor) thread 0xffff80003c44f790 (171999) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83929028) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 unp_externalize+0x155 sys/kern/uipc_usrreq.c:-1 #2 soreceive+0xc24 sys/kern/uipc_socket.c:1009 #3 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #4 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #6 Xsyscall+0x128 exclusive rwlock sbufrcv r = 0 (0xffff8000014c9950) #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 sblock+0xb6 sys/kern/uipc_socket2.c:536 #3 soreceive+0x27d sys/kern/uipc_socket.c:870 #4 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #5 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10242 11053K 12142K 166960K 14437 0 pcb 18 14K 22K 166960K 658 0 rtable 189 10K 10K 166960K 671 0 pf 35 17K 67486K 166960K 190 0 ifaddr 35 6K 8K 166960K 133 0 ifgroup 55 2K 2K 166960K 218 0 sysctl 4 1K 9K 166960K 17 0 counters 68 36K 38K 166960K 304 0 ioctlops 0 0K 4K 166960K 1743 0 iov 0 0K 36K 166960K 209 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1554 98K 98K 166960K 3328 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 31 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 132 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 236K 166960K 1857 0 sigio 0 0K 0K 166960K 144 0 proc 72 115K 164K 166960K 832 0 subproc 72 4K 4K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 240 0 in_multi 67 5K 7K 166960K 204 0 ether_multi 1 0K 0K 166960K 22 0 mrt 1 0K 0K 166960K 12 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 820 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 5 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 246 167K 189K 166960K 18070 0 UVM aobj 45 3K 3K 166960K 54 0 pinsyscall 42 84K 99K 166960K 3053 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 101 0 NDP 12 0K 1K 166960K 97 0 temp 76 8652K 8728K 166960K 69720 0 kqueue 13 20K 32K 166960K 336 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 120 186 0 183 2 1 1 2 0 8 0 rtentry 176 180 0 110 5 0 5 5 0 8 0 unpcb 144 1195 0 1173 12 10 2 4 0 8 1 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpqe 32 10 0 10 1 1 0 1 0 8 0 tcpcb 736 504 0 498 8 6 2 7 0 8 1 arp 136 26 0 14 1 0 1 1 0 8 0 inpcb 328 2269 0 2258 28 21 7 10 0 8 5 nd6 152 35 0 19 1 0 1 1 0 8 0 pkpcb 40 15 0 15 4 3 1 1 0 8 1 kcovpl 48 13 0 5 1 0 1 1 0 8 0 ppxss 1192 99 0 99 3 2 1 1 0 8 1 pppxif 1504 6 0 6 3 2 1 1 0 8 1 pffrag 232 15 0 6 1 0 1 1 0 482 0 pffrnode 88 11 0 3 1 0 1 1 0 8 0 pffrent 40 104 0 94 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 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 320 1 0 1 1 1 0 1 0 8 0 pfstitem 24 164 0 49 1 0 1 1 0 8 0 pfstkey 128 165 0 50 4 0 4 4 0 8 0 pfstate 384 165 0 50 13 0 13 13 0 8 0 pfrule 1344 22 0 16 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 735 0 427 33 10 23 29 0 8 1 art_table 40 738 0 427 5 0 5 5 0 8 0 art_node 32 178 0 120 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 126 0 116 1 0 1 1 0 8 0 shmpl 112 51 0 9 2 0 2 2 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 4768 0 3255 96 0 96 96 0 8 0 ffsino 296 4768 0 3255 118 0 118 118 0 8 0 nchpl 144 7285 0 5586 64 0 64 64 0 8 0 rtmask 32 10 0 10 5 4 1 1 0 8 1 uvmvnodes 80 4718 0 0 97 0 97 97 0 8 0 vnodes 216 4718 0 0 263 0 263 263 0 8 0 namei 1024 26758 0 26758 4 3 1 2 0 8 1 percpumem 16 167 0 118 1 0 1 1 0 8 0 kstatmem 264 146 0 118 5 2 3 3 0 8 0 scsiplug 72 11 0 11 3 3 0 1 0 8 0 scxspl 216 47162 0 47162 16 15 1 8 1 8 1 plimitpl 152 811 0 793 1 0 1 1 0 8 0 sigapl 424 2152 0 2083 9 1 8 8 0 8 0 knotepl 120 585 0 0 17 0 17 17 0 8 0 kqueuepl 224 989 0 980 12 11 1 5 0 8 0 pipepl 344 524 0 496 13 7 6 9 0 8 2 fdescpl 528 2109 0 2078 3 0 3 3 0 8 0 filepl 160 15404 0 15173 28 15 13 19 0 8 0 lockfpl 104 1159 0 1157 4 2 2 2 0 8 1 lockfspl 48 484 0 482 1 0 1 1 0 8 0 sessionpl 144 28 0 20 1 0 1 1 0 8 0 pgrppl 48 165 0 149 1 0 1 1 0 8 0 ucredpl 104 2507 0 2491 1 0 1 1 0 8 0 zombiepl 144 2085 0 2083 1 0 1 1 0 8 0 processpl 1232 2152 0 2083 6 0 6 6 0 8 0 procpl 664 4982 0 4904 8 0 8 8 0 8 0 sosppl 168 6 0 6 4 4 0 1 0 8 0 sockpl 752 3795 0 3759 35 24 11 14 0 8 7 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 107 0 0 14 0 14 14 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 47 0 0 6 1 5 6 0 8 0 mtagpl 96 7 0 0 1 0 1 1 0 8 0 mbufpl 256 255 0 0 16 0 16 16 0 8 0 bufpl 280 19970 0 13826 440 1 439 440 0 8 0 anonpl 32 11040 0 0 89 0 89 89 0 246 0 amapchunkpl 152 62649 0 62138 54 19 35 35 0 158 13 amappl16 200 7854 0 7819 51 39 12 25 0 8 3 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 121 0 109 1 0 1 1 0 8 0 amappl13 176 4 0 4 1 1 0 1 0 8 0 amappl12 168 2831 0 2800 3 1 2 2 0 8 0 amappl11 160 58 0 43 1 0 1 1 0 8 0 amappl10 152 9 0 8 3 2 1 1 0 8 0 amappl9 144 249 0 249 1 1 0 1 0 8 0 amappl8 136 24 0 22 1 0 1 1 0 8 0 amappl7 128 117 0 104 1 0 1 1 0 8 0 amappl6 120 233 0 228 1 0 1 1 0 8 0 amappl5 112 146 0 136 1 0 1 1 0 8 0 amappl4 104 317 0 296 1 0 1 1 0 8 0 amappl3 96 11079 0 10977 5 2 3 4 0 8 0 amappl2 88 2359 0 2279 2 0 2 2 0 8 0 amappl1 80 15772 0 15162 16 2 14 14 0 8 0 amappl 88 17015 0 16842 5 0 5 5 0 92 0 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma2048 2048 33 0 33 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 255 0 255 3 3 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 53 0 9 1 0 1 1 0 8 0 uaddrrnd 24 2109 0 2078 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2109 0 2078 1 0 1 1 0 8 0 vmmpekpl 168 18437 0 18389 3 0 3 3 0 8 0 vmmpepl 168 136115 0 134089 121 19 102 109 0 357 8 vmsppl 488 2108 0 2078 6 1 5 5 0 8 0 rwobjpl 80 41295 0 35570 123 2 121 121 0 8 0 pdppl 4096 4226 0 4156 106 34 72 84 0 8 2 pvpl 32 18704 0 0 151 0 151 151 0 265 0 pmappl 256 2108 0 2078 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 302 0 60 8 0 8 8 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 witness_checkorder(fffffd80662e5210,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd80662e51f8,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd80662e51f8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd805b51a130,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd805b51a130,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805b51a130,fffffd805b51a130,0,0,200,0,f391a0769f7cc43) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805b51a130,fffffd805b51a130,ffff80003c44f790) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806eca5100,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff8000014c9860,ffff80002a30c538,ffff80002a30c4e8,0,ffff80002a30c520,ffff80002a30c6ac,fa1ffb33516b552a) at soreceive+0xc24 sys/kern/uipc_socket.c:1009 recvit(ffff80003c44f790,4,ffff80002a30c680,0,ffff80002a30c730) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff80003c44f790,ffff80002a30c7e0,ffff80002a30c730) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff80002a30c7e0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a30c7e0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x240cf470ce0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299fdff0) 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 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299fdff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -5