login: witness: lock order reversal: 1st 0xffff80000135f6a0 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806f45ae78 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(fffffd806f45ae78,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806f45ae68,1) at rw_enter+0x122 rrw_enter(fffffd806f45ae68,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805dcfe298,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805dcfe298,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800031b8bf98) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800031b8bf98) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff80000135f4f8,fffffd806b73aa00,ffff8000ffff31d8) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff80000135f4f8,fffffd806ccc3a00,fffffd806b73aa00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff80000135f4f8,fffffd806b73aa00,ffff800031b8c228,0,0,0) at sosend+0xa40 sendit(ffff8000ffff31d8,3,ffff800031b8c3a0,0,ffff800031b8c460) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff8000ffff31d8,ffff800031b8c510,ffff800031b8c460) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800031b8c510) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800031b8c510) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd180cf31910, count: -15 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff800031b8bbf0 rbx 0xfffffd80042c5fa8 rdx 0xffff8000013dd640 rcx 0xffff8000ffff31d8 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff800031b8bad0 r9 0x8080808080808080 r10 0x8b876316d6517cb9 r11 0xa2dd87b142d75412 r12 0 r13 0xfffffd8003adee00 r14 0x3 r15 0xffffffff rip 0xffffffff81ac00e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800031b8bbe0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=468650 pid=64840 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=80, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff3970,0xffff8000ffff2cd8 process=0xffff800037274000 user=0xffff800031b87000, vmspace=0xfffffd806b685020 estcpu=30, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 76018 285659 42964 0 7 0 syz-executor 36142 474352 34301 0 2 0 syz-executor 36142 56256 34301 0 2 0x4000000 syz-executor 64840 111644 72287 0 2 0 syz-executor *64840 468650 72287 0 7 0x4000000 syz-executor 51742 289773 52259 0 3 0x80 nanoslp syz-executor 51742 307741 52259 0 3 0x4000080 netacc syz-executor 56540 169982 56136 0 3 0x80 nanoslp syz-executor 56540 499580 56136 0 3 0x4000080 fsleep syz-executor 56540 492536 56136 0 3 0x4000080 sbwait syz-executor 44143 332617 83477 -1 3 0x90 nanoslp syz-executor 44143 145151 83477 -1 3 0x4000090 sbwait syz-executor 44143 220700 83477 -1 3 0x4000090 fsleep syz-executor 53431 29443 1 0 3 0x100083 ttyin getty 72287 515904 93578 0 3 0x82 nanoslp syz-executor 19182 63651 0 0 3 0x14280 nfsidl nfsio 44336 107028 0 0 3 0x14280 nfsidl nfsio 72023 156804 0 0 3 0x14280 nfsidl nfsio 64063 319963 0 0 3 0x14280 nfsidl nfsio 90526 347425 0 0 3 0x14280 nfsidl nfsio 15583 366186 0 0 3 0x14280 nfsidl nfsio 77404 44399 0 0 3 0x14280 nfsidl nfsio 80000 399267 0 0 3 0x14280 nfsidl nfsio 78744 140619 0 0 3 0x14280 nfsidl nfsio 35153 81341 0 0 3 0x14280 nfsidl nfsio 13799 110226 0 0 3 0x14280 nfsidl nfsio 9781 128359 0 0 3 0x14280 nfsidl nfsio 132 198204 0 0 3 0x14280 nfsidl nfsio 46703 369770 0 0 3 0x14280 nfsidl nfsio 83557 361183 0 0 3 0x14280 nfsidl nfsio 64674 150555 0 0 3 0x14280 nfsidl nfsio 61198 147138 0 0 3 0x14280 nfsidl nfsio 89831 410257 0 0 3 0x14280 nfsidl nfsio 55748 336966 0 0 3 0x14280 nfsidl nfsio 99680 119430 0 0 3 0x14280 nfsidl nfsio 2854 10165 0 0 3 0x14200 bored sosplice 91381 110292 48195 0 3 0x100082 sbwait ndp 48195 415669 99965 0 3 0x10008a sigsusp sh 99965 329658 93578 0 3 0x82 wait syz-executor 52259 56781 93578 0 3 0x82 nanoslp syz-executor 42964 392646 93578 0 3 0x82 nanoslp syz-executor 15415 56096 93578 0 3 0x82 nanoslp syz-executor 56136 439799 93578 0 3 0x82 nanoslp syz-executor 34301 519103 93578 0 3 0x82 nanoslp syz-executor 83477 321608 93578 0 3 0x82 nanoslp syz-executor 93578 367427 32888 0 3 0x82 kqread syz-executor 32888 311268 33548 0 3 0x10008a sigsusp ksh 33548 199022 11117 0 3 0x98 kqread sshd-session 11117 294172 30941 0 3 0x92 kqread sshd-session 30941 487282 1 0 3 0x88 kqread sshd 82182 6492 57577 74 3 0x1100092 bpf pflogd 57577 305857 1 0 3 0x80 sbwait pflogd 41591 310720 20234 73 3 0x1100090 kqread syslogd 20234 477888 1 0 3 0x100082 sbwait syslogd 73973 397981 1 0 3 0x100080 kqread resolvd 95849 275055 99281 77 3 0x100092 kqread dhcpleased 22574 1381 99281 77 3 0x100092 kqread dhcpleased 99281 472402 1 0 3 0x80 kqread dhcpleased 92584 242928 0 0 3 0x14200 bored smr 12996 458755 0 0 2 0x14200 zerothread 4428 335405 0 0 3 0x14200 aiodoned aiodoned 13456 367808 0 0 3 0x14200 syncer update 15355 341862 0 0 3 0x14200 cleaner cleaner 4945 129746 0 0 3 0x14200 reaper reaper 10363 302668 0 0 3 0x14200 pgdaemon pagedaemon 70276 158501 0 0 3 0x14200 bored viomb 77004 66068 0 0 3 0x40014200 acpi0 acpi0 29589 380200 0 0 3 0x40014200 idle1 11733 28033 0 0 3 0x14200 bored softnet3 61207 497583 0 0 3 0x14200 bored softnet2 31970 434355 0 0 3 0x14200 bored softnet1 11165 512847 0 0 3 0x14200 bored softnet0 16042 497706 0 0 3 0x14200 bored systqmp 30387 224514 0 0 3 0x14200 bored systq 17724 460253 0 0 3 0x14200 tmoslp softclockmp 57107 68961 0 0 3 0x40014200 tmoslp softclock 21816 263836 0 0 3 0x40014200 idle0 1 224543 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 64840 (syz-executor) thread 0xffff8000ffff31d8 (468650) 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 (0xffff80000135f6a0) #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 10234 11289K 11553K 166960K 13396 0 pcb 18 15K 17K 166960K 454 0 rtable 158 6K 7K 166960K 638 0 pf 41 18K 25K 166960K 139 0 ifaddr 34 5K 7K 166960K 77 0 ifgroup 63 2K 2K 166960K 99 0 sysctl 4 1K 1K 166960K 4 0 counters 68 36K 37K 166960K 96 0 ioctlops 0 0K 4K 166960K 1662 0 iov 0 0K 24K 166960K 146 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1483 93K 94K 166960K 2632 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 27 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 76 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 19 69K 89K 166960K 1656 0 sigio 0 0K 0K 166960K 31 0 proc 73 103K 128K 166960K 717 0 subproc 104 6K 6K 166960K 118 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 397 0 in_multi 59 4K 7K 166960K 201 0 ether_multi 1 0K 0K 166960K 14 0 mrt 3 0K 0K 166960K 9 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 720 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 253 78K 88K 166960K 17369 0 UVM aobj 47 6K 6K 166960K 53 0 pinsyscall 45 90K 106K 166960K 2764 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 63 0 NDP 14 0K 1K 166960K 51 0 temp 78 6828K 6901K 166960K 73295 0 kqueue 15 24K 30K 166960K 271 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 120 135 0 131 1 0 1 1 0 8 0 rtentry 112 179 0 113 4 0 4 4 0 8 0 unpcb 144 1179 0 1154 8 4 4 4 0 8 3 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 808 653 0 649 17 9 8 8 0 8 7 arp 120 42 0 23 1 0 1 1 0 8 0 inpcb 336 1980 0 1969 18 11 7 12 0 8 5 nd6 136 37 0 24 1 0 1 1 0 8 0 pkpcb 40 7 0 7 4 3 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1168 12 0 12 2 1 1 1 0 8 1 pffrag 232 12 0 6 1 0 1 1 0 482 0 pffrnode 88 11 0 6 1 0 1 1 0 8 0 pffrent 40 24 0 18 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 1 1 0 1 1 0 8 0 pfstitem 24 152 0 38 1 0 1 1 0 8 0 pfstkey 128 154 0 40 4 0 4 4 0 8 0 pfstate 376 152 0 39 12 0 12 12 0 8 0 pfrule 1344 28 0 22 2 0 2 2 0 8 0 art_heap8 4096 5 0 1 4 0 4 4 0 8 0 art_heap4 256 801 0 486 29 5 24 29 0 8 0 art_table 32 806 0 487 4 0 4 4 0 8 0 art_node 16 176 0 118 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 73 0 63 1 0 1 1 0 8 0 shmpl 112 50 0 6 2 0 2 2 0 8 0 dirhash 1024 36 0 19 3 0 3 3 0 8 0 dino2pl 256 4285 0 2785 95 0 95 95 0 8 0 ffsino 272 4285 0 2785 101 0 101 101 0 8 0 nchpl 144 6655 0 4960 63 0 63 63 0 8 0 uvmvnodes 80 5201 0 0 107 0 107 107 0 8 0 vnodes 216 5201 0 0 289 0 289 289 0 8 0 namei 1024 23391 0 23390 3 2 1 2 0 8 0 percpumem 16 62 0 14 1 0 1 1 0 8 0 kstatmem 264 56 0 28 3 1 2 3 0 8 0 scsiplug 72 15 0 15 3 2 1 1 0 8 1 scxspl 216 22517 0 22517 18 15 3 8 1 8 3 plimitpl 152 332 0 314 1 0 1 1 0 8 0 sigapl 424 1979 0 1907 9 0 9 9 0 8 0 futexpl 64 23254 0 23252 1 0 1 1 0 8 0 knotepl 120 893 0 0 28 0 28 28 0 8 0 kqueuepl 216 477 0 465 5 4 1 5 0 8 0 pipepl 320 306 0 279 3 0 3 3 0 8 0 fdescpl 496 1937 0 1904 5 0 5 5 0 8 0 filepl 152 12930 0 12668 21 6 15 16 0 8 4 lockfpl 104 912 0 909 3 1 2 2 0 8 1 lockfspl 48 263 0 260 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 81 0 64 1 0 1 1 0 8 0 ucredpl 104 2214 0 2200 1 0 1 1 0 8 0 zombiepl 144 1908 0 1907 1 0 1 1 0 8 0 processpl 1160 1979 0 1907 6 0 6 6 0 8 0 procpl 648 4615 0 4536 9 1 8 8 0 8 0 srpgc 96 6 0 6 2 2 0 1 0 8 0 sosppl 168 17 0 17 3 2 1 1 0 8 1 sockpl 664 3352 0 3312 25 16 9 14 0 8 5 mcl64k 65536 4 0 0 1 0 1 1 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 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 140 0 0 18 0 18 18 0 8 0 mcl2k 2048 56 0 0 5 0 5 5 0 8 0 mtagpl 96 175 0 0 5 0 5 5 0 8 0 mbufpl 256 1311 0 0 80 0 80 80 0 8 0 bufpl 280 9323 0 3149 442 0 442 442 0 8 0 anonpl 24 304542 0 297357 95 32 63 70 0 185 3 amapchunkpl 152 57816 0 57122 44 6 38 38 0 158 8 amappl16 200 7300 0 7164 40 22 18 19 0 8 6 amappl15 192 8 0 8 2 2 0 1 0 8 0 amappl14 184 130 0 117 1 0 1 1 0 8 0 amappl13 176 12 0 12 1 1 0 1 0 8 0 amappl12 168 2650 0 2615 4 1 3 3 0 8 0 amappl11 160 55 0 40 1 0 1 1 0 8 0 amappl10 152 10 0 10 1 1 0 1 0 8 0 amappl9 144 132 0 131 1 0 1 1 0 8 0 amappl8 136 31 0 27 1 0 1 1 0 8 0 amappl7 128 106 0 93 1 0 1 1 0 8 0 amappl6 120 177 0 173 1 0 1 1 0 8 0 amappl5 112 157 0 145 1 0 1 1 0 8 0 amappl4 104 404 0 384 1 0 1 1 0 8 0 amappl3 96 10643 0 10542 3 0 3 3 0 8 0 amappl2 88 2238 0 2151 3 0 3 3 0 8 0 amappl1 80 12442 0 11847 14 0 14 14 0 8 0 amappl 88 16884 0 16697 5 0 5 5 0 92 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 128 256 0 256 3 2 1 1 0 8 1 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 20 0 19 1 0 1 1 0 8 0 aobjpl 72 52 0 6 1 0 1 1 0 8 0 uaddrrnd 24 1937 0 1904 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1937 0 1904 1 0 1 1 0 8 0 vmmpekpl 168 15967 0 15919 3 0 3 3 0 8 0 vmmpepl 168 124201 0 122132 113 14 99 100 0 357 6 vmsppl 448 1936 0 1904 6 1 5 5 0 8 0 rwobjpl 56 39418 0 33073 90 0 90 90 0 8 0 pdppl 4096 3881 0 3808 105 32 73 83 0 8 0 pvpl 32 18943 0 0 154 1 153 153 0 265 0 pmappl 248 1936 0 1904 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 493 0 64 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(fffffd806f45ae78,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806f45ae68,1) at rw_enter+0x122 rrw_enter(fffffd806f45ae68,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805dcfe298,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805dcfe298,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800031b8bf98) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800031b8bf98) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff80000135f4f8,fffffd806b73aa00,ffff8000ffff31d8) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff80000135f4f8,fffffd806ccc3a00,fffffd806b73aa00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff80000135f4f8,fffffd806b73aa00,ffff800031b8c228,0,0,0) at sosend+0xa40 sendit(ffff8000ffff31d8,3,ffff800031b8c3a0,0,ffff800031b8c460) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff8000ffff31d8,ffff800031b8c510,ffff800031b8c460) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800031b8c510) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800031b8c510) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd180cf31910, 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 __mp_lock(ffffffff835a0960) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835a0960) at __mp_lock+0x199 sys/kern/kern_lock.c:144 syscall(ffff80002a1243f0) at syscall+0xad6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80002a1243f0) at syscall+0xad6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73cb1dacccd0, count: -6