witness: lock order reversal: 1st 0xffff8000012ed938 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806f46b5f8 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff830bd238 -> 0xffffffff8306e212 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(fffffd806f46b5f8,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806f46b5e8,1) at rw_enter+0x122 rrw_enter(fffffd806f46b5e8,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805fff01c8,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805fff01c8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800030574228) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800030574228) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff8000012ed790,fffffd806bc8cc00,ffff8000fffea2c0) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff8000012ed790,fffffd806b899f00,fffffd806bc8cc00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff8000012ed790,fffffd806bc8cc00,ffff8000305744b8,0,0,0) at sosend+0xa40 sendit(ffff8000fffea2c0,5,ffff800030574630,0,ffff8000305746f0) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff8000fffea2c0,ffff8000305747a0,ffff8000305746f0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff8000305747a0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000305747a0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe23bf53c050, count: -15 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff800030573e80 rbx 0xfffffd80042c6608 rdx 0xffff800001324340 rcx 0xffff8000fffea2c0 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff800030573d60 r9 0x8080808080808080 r10 0xef52436b39f17fea r11 0x27670c21d6b36b88 r12 0 r13 0xfffffd8003adee00 r14 0x3 r15 0xffffffff rip 0xffffffff81ac00e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800030573e70 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=309525 pid=93473 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffeb700,0xffffffff836345a0 process=0xffff8000fffef660 user=0xffff80003056f000, vmspace=0xfffffd806ce248d8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 93473 374956 46797 0 2 0x10 syz-executor *93473 309525 46797 0 7 0x4000010 syz-executor 10630 430750 79071 0 2 0 syz-executor 10630 136609 79071 0 3 0x4000080 fsleep syz-executor 82338 201741 65231 0 2 0 syz-executor 82338 13988 65231 0 3 0x4000080 fsleep syz-executor 34839 522067 96876 0 2 0 syz-executor 34839 360370 96876 0 3 0x4000080 fsleep syz-executor 1168 441047 85418 0 3 0x80 nanoslp syz-executor 1168 392486 85418 0 3 0x4000080 kqsel syz-executor 1168 318464 85418 0 3 0x4000080 fsleep syz-executor 1168 275444 85418 0 3 0x4000080 fsleep syz-executor 48694 436291 1 0 3 0x100083 ttyin getty 92991 483178 5299 0 3 0x82 piperd syz-executor 46797 357930 5299 0 3 0x82 nanoslp syz-executor 60457 260693 0 0 3 0x14200 acct acct 34708 326610 0 0 3 0x14280 nfsidl nfsio 70038 52359 0 0 3 0x14280 nfsidl nfsio 77548 273601 0 0 3 0x14280 nfsidl nfsio 70313 470107 0 0 3 0x14280 nfsidl nfsio 6130 290465 0 0 3 0x14280 nfsidl nfsio 77790 261310 0 0 3 0x14280 nfsidl nfsio 23066 224208 0 0 3 0x14280 nfsidl nfsio 92335 395329 0 0 3 0x14280 nfsidl nfsio 7977 313370 0 0 3 0x14280 nfsidl nfsio 53755 456168 0 0 3 0x14280 nfsidl nfsio 29706 54848 0 0 3 0x14280 nfsidl nfsio 80153 163009 0 0 3 0x14280 nfsidl nfsio 70305 350505 0 0 3 0x14280 nfsidl nfsio 2228 125180 0 0 3 0x14280 nfsidl nfsio 81147 80417 0 0 3 0x14280 nfsidl nfsio 97475 499436 0 0 3 0x14280 nfsidl nfsio 37853 155816 0 0 3 0x14280 nfsidl nfsio 80327 251651 0 0 3 0x14280 nfsidl nfsio 22387 362047 0 0 3 0x14280 nfsidl nfsio 41087 92210 0 0 3 0x14280 nfsidl nfsio 36144 460512 0 0 3 0x14200 bored sosplice 70181 377373 21275 0 3 0x100082 sbwait arp 21275 56930 1 0 3 0x10008a sigsusp sh 63671 521559 5299 0 3 0x82 piperd syz-executor 85418 175251 5299 0 3 0x82 nanoslp syz-executor 65231 353910 5299 0 3 0x82 nanoslp syz-executor 20637 433807 5299 0 3 0x82 piperd syz-executor 96876 280110 5299 0 2 0x2 syz-executor 79071 410259 5299 0 3 0x82 nanoslp syz-executor 5299 49626 41104 0 2 0x2 syz-executor 41104 415881 69814 0 3 0x10008a sigsusp ksh 69814 226694 32704 0 3 0x98 kqread sshd-session 32704 369607 71385 0 3 0x92 kqread sshd-session 71385 12091 1 0 3 0x88 kqread sshd 72251 163282 26380 74 3 0x1100092 bpf pflogd 26380 237419 1 0 3 0x80 sbwait pflogd 73967 96425 474 73 3 0x1100090 kqread syslogd 474 120689 1 0 3 0x100082 sbwait syslogd 88870 477827 1 0 3 0x100080 kqread resolvd 94934 492662 44209 77 3 0x100092 kqread dhcpleased 78044 272166 44209 77 3 0x100092 kqread dhcpleased 44209 407259 1 0 3 0x80 kqread dhcpleased 78099 283832 0 0 3 0x14200 bored smr 53670 479388 0 0 2 0x14200 zerothread 86194 429822 0 0 3 0x14200 aiodoned aiodoned 71316 98228 0 0 3 0x14200 syncer update 75329 336766 0 0 3 0x14200 cleaner cleaner 46793 334369 0 0 3 0x14200 reaper reaper 60568 107751 0 0 3 0x14200 pgdaemon pagedaemon 65805 127236 0 0 3 0x14200 bored viomb 15257 496420 0 0 3 0x40014200 acpi0 acpi0 73255 27478 0 0 7 0x40014200 idle1 71540 421050 0 0 3 0x14200 bored softnet3 99441 382089 0 0 3 0x14200 bored softnet2 55682 134087 0 0 3 0x14200 bored softnet1 56375 340978 0 0 3 0x14200 bored softnet0 57509 378229 0 0 3 0x14200 bored systqmp 62263 498419 0 0 3 0x14200 bored systq 72037 57524 0 0 3 0x14200 tmoslp softclockmp 4158 291409 0 0 3 0x40014200 tmoslp softclock 81435 105567 0 0 3 0x40014200 idle0 1 341129 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 93473 (syz-executor) thread 0xffff8000fffea2c0 (309525) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff835a0b68) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 unp_connect+0x26c sys/kern/uipc_usrreq.c:868 #2 uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 #3 sosend+0xa40 #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 exclusive rwlock sbufsnd r = 0 (0xffff8000012ed938) #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10218 11403K 11533K 166960K 14468 0 pcb 17 14K 16K 166960K 544 0 rtable 210 7K 7K 166960K 610 0 pf 41 19K 23K 166960K 159 0 ifaddr 41 7K 7K 166960K 96 0 ifgroup 58 2K 2K 166960K 146 0 sysctl 3 0K 0K 166960K 3 0 counters 64 36K 36K 166960K 124 0 ioctlops 0 0K 4K 166960K 1803 0 iov 0 0K 20K 166960K 212 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1438 90K 91K 166960K 3187 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 40K 72K 166960K 40 0 VM map 2 1K 1K 166960K 2 0 sem 26 16K 16K 166960K 57 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 97K 166960K 1877 0 sigio 0 0K 0K 166960K 40 0 proc 73 91K 140K 166960K 843 0 subproc 117 7K 7K 166960K 144 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 348 0 in_multi 91 6K 6K 166960K 189 0 ether_multi 1 0K 0K 166960K 7 0 mrt 0 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 795 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 242 73K 91K 166960K 19405 0 UVM aobj 98 6K 6K 166960K 108 0 pinsyscall 43 86K 108K 166960K 3081 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 210 0 NDP 12 0K 1K 166960K 67 0 temp 82 6828K 7084K 166960K 86080 0 kqueue 13 20K 28K 166960K 330 0 SYN cache 2 8K 16K 166960K 3 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 120 153 0 149 1 0 1 1 0 8 0 rtentry 112 193 0 98 3 0 3 3 0 8 0 unpcb 144 1398 0 1377 15 14 1 6 0 8 0 syncache 336 13 0 13 5 4 1 1 0 8 1 tcpqe 32 6 0 6 4 3 1 1 0 8 1 tcpcb 808 1027 0 1020 24 16 8 8 0 8 6 arp 120 35 0 16 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 336 2988 0 2972 44 34 10 12 0 8 8 nd6 136 39 0 17 1 0 1 1 0 8 0 pkpcb 40 8 0 8 4 3 1 1 0 8 1 kcovpl 48 11 0 2 1 0 1 1 0 8 0 ppxss 1168 19 0 19 6 5 1 1 0 8 1 pfstscr 40 6 0 5 1 0 1 1 0 8 0 pffrag 232 6 0 2 1 0 1 1 0 482 0 pffrnode 88 6 0 2 1 0 1 1 0 8 0 pffrent 40 10 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 3 0 0 1 0 1 1 0 8 0 pfstitem 24 137 0 50 1 0 1 1 0 8 0 pfstkey 128 148 0 61 3 0 3 3 0 8 0 pfstate 376 139 0 55 9 0 9 9 0 8 0 pfrule 1344 33 0 24 2 0 2 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 768 0 327 34 6 28 28 0 8 0 art_table 32 771 0 327 4 0 4 4 0 8 0 art_node 16 185 0 102 1 0 1 1 0 8 0 sysvmsgpl 40 47 0 7 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 50 0 26 1 0 1 1 0 8 0 shmpl 112 105 0 10 3 0 3 3 0 8 0 dirhash 1024 35 0 18 3 0 3 3 0 8 0 dino2pl 256 4931 0 3428 95 0 95 95 0 8 0 ffsino 272 4931 0 3428 101 0 101 101 0 8 0 nchpl 144 7664 0 7119 64 31 33 64 0 8 8 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 28042 0 28041 5 4 1 2 0 8 0 percpumem 16 76 0 30 1 0 1 1 0 8 0 kstatmem 264 84 0 60 2 0 2 2 0 8 0 scsiplug 72 6 0 6 3 2 1 1 0 8 1 scxspl 216 21962 0 21962 13 12 1 8 1 8 1 plimitpl 152 438 0 419 1 0 1 1 0 8 0 sigapl 424 2205 0 2134 10 1 9 9 0 8 0 futexpl 64 27929 0 27924 1 0 1 1 0 8 0 knotepl 120 572 0 0 17 0 17 17 0 8 0 kqueuepl 216 645 0 634 7 6 1 5 0 8 0 pipepl 320 349 0 319 9 6 3 9 0 8 0 fdescpl 496 2165 0 2134 6 1 5 6 0 8 0 filepl 152 16379 0 16114 43 28 15 19 0 8 3 lockfpl 104 840 0 838 3 2 1 2 0 8 0 lockfspl 48 275 0 273 1 0 1 1 0 8 0 sessionpl 144 39 0 30 1 0 1 1 0 8 0 pgrppl 48 69 0 51 1 0 1 1 0 8 0 ucredpl 104 2770 0 2756 1 0 1 1 0 8 0 zombiepl 144 2715 0 2715 3 2 1 1 0 8 1 processpl 1160 2205 0 2134 6 0 6 6 0 8 0 procpl 648 5033 0 4955 8 0 8 8 0 8 0 srpgc 96 7 0 7 3 3 0 1 0 8 0 sosppl 168 10 0 10 3 2 1 1 0 8 1 sockpl 664 4577 0 4537 51 39 12 15 0 8 7 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 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 11 0 0 2 0 2 2 0 8 0 mcl4k 4096 152 0 0 19 0 19 19 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 33 0 0 4 0 4 4 0 8 0 mtagpl 96 41 0 0 1 0 1 1 0 8 0 mbufpl 256 1120 0 0 70 0 70 70 0 8 0 bufpl 280 6933 0 759 442 0 442 442 0 8 0 anonpl 24 356512 0 347695 182 102 80 85 0 185 14 amapchunkpl 152 64465 0 63861 61 23 38 38 0 158 7 amappl16 200 9152 0 8915 93 67 26 29 0 8 8 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 149 0 135 1 0 1 1 0 8 0 amappl13 176 15 0 15 2 2 0 1 0 8 0 amappl12 168 2860 0 2828 4 2 2 3 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 12 0 12 1 1 0 1 0 8 0 amappl9 144 152 0 151 1 0 1 1 0 8 0 amappl8 136 21 0 18 1 0 1 1 0 8 0 amappl7 128 122 0 109 1 0 1 1 0 8 0 amappl6 120 196 0 192 1 0 1 1 0 8 0 amappl5 112 183 0 171 1 0 1 1 0 8 0 amappl4 104 366 0 344 1 0 1 1 0 8 0 amappl3 96 11704 0 11609 3 0 3 3 0 8 0 amappl2 88 2562 0 2476 3 0 3 3 0 8 0 amappl1 80 15519 0 14920 15 0 15 15 0 8 0 amappl 88 18788 0 18611 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 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 8 0 8 2 2 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 107 0 10 2 0 2 2 0 8 0 uaddrrnd 24 2165 0 2134 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2165 0 2134 1 0 1 1 0 8 0 vmmpekpl 168 18797 0 18749 3 0 3 3 0 8 0 vmmpepl 168 142031 0 139946 148 39 109 112 0 357 8 vmsppl 448 2164 0 2134 6 2 4 5 0 8 0 rwobjpl 56 46359 0 39134 113 7 106 106 0 8 3 pdppl 4096 4337 0 4268 131 56 75 87 0 8 6 pvpl 32 21214 0 0 172 1 171 171 0 265 0 pmappl 248 2164 0 2134 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 559 0 131 13 0 13 13 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(fffffd806f46b5f8,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806f46b5e8,1) at rw_enter+0x122 rrw_enter(fffffd806f46b5e8,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805fff01c8,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805fff01c8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800030574228) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800030574228) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff8000012ed790,fffffd806bc8cc00,ffff8000fffea2c0) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff8000012ed790,fffffd806b899f00,fffffd806bc8cc00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff8000012ed790,fffffd806bc8cc00,ffff8000305744b8,0,0,0) at sosend+0xa40 sendit(ffff8000fffea2c0,5,ffff800030574630,0,ffff8000305746f0) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff8000fffea2c0,ffff8000305747a0,ffff8000305746f0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff8000305747a0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000305747a0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe23bf53c050, 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