witness: lock order reversal: 1st 0xffff80000150f9f0 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd8060117ca8 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff8343fb6e -> 0xffffffff833a68ec is missing lock order [2] inode (&ip->i_lock) -> [1] sbufrcv (&so->so_rcv.sb_lock) #0 rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 #1 sblock+0xb7 sys/kern/uipc_socket2.c:536 #2 soreceive+0x28e sys/kern/uipc_socket.c:882 #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+0xf8 sys/kern/vfs_vnops.c:531 #10 sys_ioctl+0x5c3 #11 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #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(fffffd8060117ca8,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd8060117c90,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd8060117c90,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd80642266e0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd80642266e0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd80642266e0,fffffd8064226890,0,0,200,0,7644a220c70afa44) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd80642266e0,fffffd8064226890,ffff8000ffffd490) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806bd82300,33,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff80000150f910,ffff80003c5c0188,ffff80003c5c0138,0,ffff80003c5c0178,ffff80003c5c02fc,fa4c3cafb2a627ec) at soreceive+0xc73 sys/kern/uipc_socket.c:1021 recvit(ffff8000ffffd490,5,ffff80003c5c02d0,0,ffff80003c5c0380) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff8000ffffd490,ffff80003c5c0430,ffff80003c5c0380) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80003c5c0430) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5c0430) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc56f6bca7e0, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c5bfc10 rbx 0xfffffd80047094e8 rdx 0xffff80000144d2c0 rcx 0xffff8000ffffd490 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c5bfaf0 r9 0x8080808080808080 r10 0xe46b8211237d1750 r11 0xf478b3801eee1c9a r12 0 r13 0xfffffd8003f20f00 r14 0x3 r15 0xffffffff rip 0xffffffff8136a795 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c5bfc00 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=510435 pid=51059 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=0xffff80003b4d22c0,0xffffffff839933e8 process=0xffff80003b4d4de8 user=0xffff80003c5bb000, vmspace=0xfffffd806bd7f028 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 51059 308345 71614 0 2 0x1000000 syz-executor *51059 510435 71614 0 7 0x5000000 syz-executor 20641 339498 21863 0 2 0 syz-executor 20641 519535 21863 0 3 0x4000080 kqsel syz-executor 20641 400636 21863 0 3 0x4000080 fsleep syz-executor 20641 336610 21863 0 3 0x4000080 fsleep syz-executor 33948 147997 30042 0 2 0 syz-executor 33948 208061 30042 0 2 0x4000000 syz-executor 19582 403319 99050 0 2 0 syz-executor 19582 253730 99050 0 3 0x4000080 kqsel syz-executor 19582 405276 99050 0 3 0x4000080 kqsel syz-executor 82416 73148 1817 0 2 0 syz-executor 82416 402283 1817 0 3 0x4000080 fsleep syz-executor 62396 164756 79217 0 3 0x80 nanoslp syz-executor 62396 146199 79217 0 3 0x4000080 fsleep syz-executor 62396 219904 79217 0 3 0x4000080 ttyout syz-executor 62396 192348 79217 0 3 0x4000080 fsleep syz-executor 327 508715 0 0 3 0x14280 nfsidl nfsio 78115 422896 0 0 3 0x14280 nfsidl nfsio 77597 391443 0 0 3 0x14280 nfsidl nfsio 52159 517762 0 0 3 0x14280 nfsidl nfsio 79355 93753 0 0 3 0x14280 nfsidl nfsio 40858 161096 0 0 3 0x14280 nfsidl nfsio 51642 219954 0 0 3 0x14280 nfsidl nfsio 27374 523779 0 0 3 0x14280 nfsidl nfsio 99832 148841 0 0 3 0x14280 nfsidl nfsio 64673 298692 0 0 3 0x14280 nfsidl nfsio 22912 336292 0 0 3 0x14280 nfsidl nfsio 39381 441317 0 0 3 0x14280 nfsidl nfsio 3966 261796 0 0 3 0x14280 nfsidl nfsio 32803 469246 0 0 3 0x14280 nfsidl nfsio 36336 511297 0 0 3 0x14280 nfsidl nfsio 60067 291116 0 0 3 0x14280 nfsidl nfsio 10808 407150 0 0 3 0x14280 nfsidl nfsio 46225 467013 0 0 3 0x14280 nfsidl nfsio 53995 452316 0 0 3 0x14280 nfsidl nfsio 91631 368831 0 0 3 0x14280 nfsidl nfsio 99050 197749 46674 0 3 0x82 nanoslp syz-executor 27784 308031 1 0 3 0x100083 ttyin getty 58575 418296 0 0 3 0x14200 bored sosplice 1817 52241 46674 0 3 0x82 nanoslp syz-executor 21863 514505 46674 0 3 0x82 nanoslp syz-executor 79217 520782 46674 0 3 0x82 nanoslp syz-executor 71614 484638 46674 0 3 0x82 nanoslp syz-executor 19413 16874 46674 0 3 0x82 nanoslp syz-executor 30042 89424 46674 0 3 0x82 nanoslp syz-executor 69435 383496 46674 0 3 0x82 nanoslp syz-executor 46674 307259 19632 0 2 0x2 syz-executor 19632 15990 50672 0 3 0x10008a sigsusp ksh 50672 167329 12976 0 3 0x98 kqread sshd-session 12976 440625 54586 0 3 0x92 kqread sshd-session 54586 489747 1 0 3 0x88 kqread sshd 4927 197941 86946 74 3 0x1100092 bpf pflogd 86946 457452 1 0 3 0x80 sbwait pflogd 92448 193 34244 73 3 0x1100090 kqread syslogd 34244 23030 1 0 3 0x100082 sbwait syslogd 96128 216448 1 0 3 0x100080 kqread resolvd 57735 214282 8869 77 3 0x100092 kqread dhcpleased 20490 381393 8869 77 3 0x100092 kqread dhcpleased 8869 218119 1 0 3 0x80 kqread dhcpleased 49589 353613 0 0 3 0x14200 bored smr 73188 47016 0 0 2 0x14200 zerothread 8835 466452 0 0 3 0x14200 aiodoned aiodoned 33610 180044 0 0 3 0x14200 syncer update 21909 162186 0 0 3 0x14200 cleaner cleaner 97780 364884 0 0 3 0x14200 reaper reaper 68250 87158 0 0 3 0x14200 pgdaemon pagedaemon 73337 229575 0 0 3 0x14200 bored viomb 58679 120045 0 0 3 0x40014200 acpi0 acpi0 8010 450447 0 0 7 0x40014200 idle1 26725 312868 0 0 3 0x14200 bored softnet3 63063 334569 0 0 3 0x14200 bored softnet2 22847 296456 0 0 3 0x14200 bored softnet1 71521 513094 0 0 3 0x14200 bored softnet0 63029 447012 0 0 3 0x14200 bored systqmp 923 72708 0 0 3 0x14200 bored systq 19535 204315 0 0 3 0x14200 tmoslp softclockmp 40667 55144 0 0 3 0x40014200 tmoslp softclock 74021 475539 0 0 3 0x40014200 idle0 1 27017 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 51059 (syz-executor) thread 0xffff8000ffffd490 (510435) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8398f708) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 unp_externalize+0x14e #2 soreceive+0xc73 sys/kern/uipc_socket.c:1021 #3 recvit+0x40a sys/kern/uipc_syscalls.c:1072 #4 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #6 Xsyscall+0x128 exclusive rwlock sbufrcv r = 0 (0xffff80000150f9f0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 sblock+0xb7 sys/kern/uipc_socket2.c:536 #3 soreceive+0x28e sys/kern/uipc_socket.c:882 #4 recvit+0x40a sys/kern/uipc_syscalls.c:1072 #5 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10201 11085K 11352K 166960K 12770 0 pcb 17 14K 15K 166960K 146 0 rtable 169 7K 10K 166960K 491 0 pf 36 18K 23K 166960K 142 0 ifaddr 34 5K 7K 166960K 84 0 ifgroup 53 2K 2K 166960K 144 0 sysctl 4 1K 1K 166960K 4 0 counters 64 36K 37K 166960K 134 0 ioctlops 0 0K 4K 166960K 1550 0 iov 0 0K 16K 166960K 69 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1427 90K 90K 166960K 2220 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 35 0 dirhash 12 2K 2K 166960K 36 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 110K 166960K 851 0 sigio 1 0K 0K 166960K 15 0 proc 75 103K 128K 166960K 634 0 subproc 72 4K 4K 166960K 82 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 90 0 in_multi 66 4K 7K 166960K 133 0 ether_multi 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 568 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 248 74K 88K 166960K 9255 0 UVM aobj 19 2K 4K 166960K 21 0 pinsyscall 43 86K 104K 166960K 1990 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 33 0 NDP 12 0K 2K 166960K 55 0 temp 77 8644K 8724K 166960K 51895 0 kqueue 15 24K 30K 166960K 167 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 93 0 87 1 0 1 1 0 8 0 rtentry 112 142 0 72 4 0 4 4 0 8 0 unpcb 144 967 0 816 13 7 6 6 0 8 0 syncache 336 12 0 12 2 1 1 1 0 8 1 tcpqe 32 6 0 6 2 1 1 1 0 8 1 tcpcb 808 364 0 351 11 9 2 8 0 8 0 arp 120 22 0 9 1 0 1 1 0 8 0 inpcb 376 1060 0 1040 12 9 3 9 0 8 1 nd6 136 31 0 16 1 0 1 1 0 8 0 pkpcb 40 3 0 3 2 2 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1168 20 0 19 2 1 1 1 0 8 0 pppxif 1472 5 0 5 1 0 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 4 0 1 1 0 1 1 0 482 0 pffrnode 88 4 0 1 1 0 1 1 0 8 0 pffrent 40 7 0 4 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 pfrktable 1344 6 0 6 2 2 0 1 0 8 0 pfanchor 1288 2 0 1 1 0 1 1 0 8 0 pftag 88 3 0 3 2 2 0 1 0 8 0 pfstitem 24 70 0 21 1 0 1 1 0 8 0 pfstkey 128 73 0 24 2 0 2 2 0 8 0 pfstate 376 71 0 23 6 0 6 6 0 8 0 pfrule 1344 28 0 21 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 614 0 293 29 5 24 29 0 8 0 art_table 32 617 0 293 4 0 4 4 0 8 0 art_node 16 139 0 79 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 32 0 22 2 1 1 1 0 8 0 shmpl 112 18 0 2 1 0 1 1 0 8 0 dirhash 1024 33 0 16 3 0 3 3 0 8 0 dino2pl 256 3059 0 1559 95 0 95 95 0 8 0 ffsino 280 3059 0 1559 109 0 109 109 0 8 0 nchpl 144 4245 0 2547 63 0 63 63 0 8 0 rtmask 32 2 0 2 2 1 1 1 0 8 1 uvmvnodes 80 3595 0 0 74 0 74 74 0 8 0 vnodes 216 3595 0 0 200 0 200 200 0 8 0 namei 1024 15372 0 15372 3 2 1 2 0 8 1 percpumem 16 81 0 35 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 1 1 1 0 1 0 8 0 kstatmem 264 74 0 50 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 5 0 5 1 1 0 1 0 8 0 scxspl 216 12952 0 12952 10 4 6 8 1 8 6 plimitpl 152 145 0 127 1 0 1 1 0 8 0 sigapl 424 1172 0 1101 10 1 9 9 0 8 0 futexpl 64 12148 0 12143 1 0 1 1 0 8 0 knotepl 120 552 0 0 17 0 17 17 0 8 0 kqueuepl 216 269 0 254 4 2 2 2 0 8 0 pipepl 328 270 0 243 8 0 8 8 0 8 5 fdescpl 504 1131 0 1099 5 0 5 5 0 8 0 filepl 152 7931 0 7499 23 6 17 17 0 8 0 lockfpl 104 226 0 223 1 0 1 1 0 8 0 lockfspl 48 98 0 95 1 0 1 1 0 8 0 sessionpl 144 31 0 22 1 0 1 1 0 8 0 pgrppl 48 54 0 37 1 0 1 1 0 8 0 ucredpl 104 1303 0 1290 1 0 1 1 0 8 0 zombiepl 144 1103 0 1101 2 1 1 1 0 8 0 processpl 1176 1172 0 1101 6 0 6 6 0 8 0 procpl 656 2244 0 2162 8 0 8 8 0 8 0 srpgc 96 8 0 8 2 1 1 1 0 8 1 sosppl 168 7 0 7 1 0 1 1 0 8 1 sockpl 688 2136 0 1959 30 13 17 17 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 20 0 0 1 0 1 1 0 8 0 mbufpl 256 222 0 0 14 0 14 14 0 8 0 bufpl 280 3917 0 138 270 0 270 270 0 8 0 anonpl 24 188102 0 173071 94 3 91 91 0 184 0 amapchunkpl 152 29827 0 29181 34 3 31 32 0 158 6 amappl16 200 4211 0 3574 39 5 34 34 0 8 0 amappl15 192 7 0 6 1 0 1 1 0 8 0 amappl14 184 128 0 116 1 0 1 1 0 8 0 amappl13 176 6 0 6 2 2 0 1 0 8 0 amappl12 168 1797 0 1765 4 2 2 3 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 7 0 6 1 0 1 1 0 8 0 amappl9 144 258 0 258 1 1 0 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 113 0 100 1 0 1 1 0 8 0 amappl6 120 186 0 181 1 0 1 1 0 8 0 amappl5 112 127 0 117 1 0 1 1 0 8 0 amappl4 104 345 0 325 1 0 1 1 0 8 0 amappl3 96 5910 0 5788 4 0 4 4 0 8 0 amappl2 88 727 0 663 2 0 2 2 0 8 0 amappl1 80 11713 0 11138 16 2 14 14 0 8 0 amappl 88 8804 0 8614 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 0 1 1 0 8 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 20 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1131 0 1099 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1131 0 1099 1 0 1 1 0 8 0 vmmpekpl 168 11239 0 11197 3 0 3 3 0 8 0 vmmpepl 168 76883 0 74334 116 4 112 112 0 357 1 vmsppl 456 1130 0 1099 6 1 5 5 0 8 0 rwobjpl 64 27077 0 21897 84 0 84 84 0 8 0 pdppl 4096 2270 0 2198 110 36 74 86 0 8 2 pvpl 32 23465 0 0 190 0 190 190 0 265 0 pmappl 248 1130 0 1099 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 303 0 56 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(fffffd8060117ca8,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd8060117c90,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd8060117c90,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd80642266e0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd80642266e0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd80642266e0,fffffd8064226890,0,0,200,0,7644a220c70afa44) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd80642266e0,fffffd8064226890,ffff8000ffffd490) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806bd82300,33,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff80000150f910,ffff80003c5c0188,ffff80003c5c0138,0,ffff80003c5c0178,ffff80003c5c02fc,fa4c3cafb2a627ec) at soreceive+0xc73 sys/kern/uipc_socket.c:1021 recvit(ffff8000ffffd490,5,ffff80003c5c02d0,0,ffff80003c5c0380) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff8000ffffd490,ffff80003c5c0430,ffff80003c5c0380) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80003c5c0430) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5c0430) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc56f6bca7e0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029aabff0) 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+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffff800029aabff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5