witness: lock order reversal: 1st 0xffff80000149f928 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd806dd4cef8 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff834385bd -> 0xffffffff833a5512 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(fffffd806dd4cef8,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806dd4cee0,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806dd4cee0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd80607d6018,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd80607d6018,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd80607d6018,fffffd80607d6960,0,0,200,0,4c0f8812e6b48ac3) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd80607d6018,fffffd80607d6960,ffff8000360c2cf8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd807e23ae00,33,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff80000149f848,ffff8000324a9b78,ffff8000324a9b28,0,ffff8000324a9b68,ffff8000324a9cec,8a19a7e1dd38b4ae) at soreceive+0xc73 sys/kern/uipc_socket.c:1021 recvit(ffff8000360c2cf8,5,ffff8000324a9cc0,0,ffff8000324a9d70) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff8000360c2cf8,ffff8000324a9e20,ffff8000324a9d70) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff8000324a9e20) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000324a9e20) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x415c0554ec0, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff8000324a9600 rbx 0xfffffd800470d790 rdx 0xffff800001446880 rcx 0xffff8000360c2cf8 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff8000324a94e0 r9 0x8080808080808080 r10 0x28615d9636f8199a r11 0x1974bba095c77b01 r12 0 r13 0xfffffd8003f24f00 r14 0x3 r15 0xffffffff rip 0xffffffff810240e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000324a95f0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=512563 pid=16012 tcnt=2 stat=onproc flags process=1000000 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000360c27d8,0xffff8000360c2038 process=0xffff8000330b1bb0 user=0xffff8000324a4000, vmspace=0xfffffd8069471c98 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 37540 130114 97028 0 7 0 syz-executor 37540 273610 97028 0 2 0x4000000 syz-executor 16012 224001 75447 0 2 0x1000000 syz-executor *16012 512563 75447 0 7 0x5000000 syz-executor 39950 500864 76152 0 2 0 syz-executor 39950 43743 76152 0 3 0x4000000 smrbar syz-executor 78956 140008 17721 0 3 0x80 nanoslp syz-executor 78956 58150 17721 0 3 0x4000080 kqread syz-executor 78956 467814 17721 0 3 0x4000080 fsleep syz-executor 53606 78479 9626 0 3 0x80 nanoslp syz-executor 53606 256338 9626 0 3 0x4000080 lockf syz-executor 53606 437167 9626 0 3 0x4000080 fsleep syz-executor 37134 353946 0 0 3 0x14200 bored sosplice 20396 149721 35787 0 3 0x82 nanoslp syz-executor 9924 365246 35787 0 3 0x2 biowait syz-executor 16121 107131 35787 0 3 0x82 nanoslp syz-executor 75447 107215 35787 0 3 0x82 nanoslp syz-executor 97028 278731 35787 0 3 0x82 nanoslp syz-executor 9626 376268 35787 0 3 0x82 nanoslp syz-executor 17721 174288 35787 0 3 0x82 nanoslp syz-executor 76152 266227 35787 0 3 0x82 nanoslp syz-executor 35787 80839 6996 0 3 0x82 kqread syz-executor 6996 85151 71181 0 3 0x10008a sigsusp ksh 71181 452583 35238 0 3 0x98 kqread sshd-session 35238 55217 38718 0 3 0x92 kqread sshd-session 51104 132589 1 0 3 0x100083 ttyin getty 38718 453027 1 0 3 0x88 kqread sshd 38506 139286 3418 74 3 0x1100092 bpf pflogd 3418 266306 1 0 3 0x80 sbwait pflogd 26964 357451 21695 73 3 0x1100090 kqread syslogd 21695 14700 1 0 3 0x100082 sbwait syslogd 14122 403936 1 0 3 0x100080 kqread resolvd 3906 18184 86549 77 3 0x100092 kqread dhcpleased 67520 21502 86549 77 3 0x100092 kqread dhcpleased 86549 425588 1 0 3 0x80 kqread dhcpleased 47265 337046 0 0 3 0x14200 bored smr 26584 396645 0 0 2 0x14200 zerothread 4067 491389 0 0 3 0x14200 aiodoned aiodoned 61858 87744 0 0 3 0x14200 syncer update 34798 216233 0 0 3 0x14200 cleaner cleaner 84041 378367 0 0 3 0x14200 reaper reaper 38158 110527 0 0 3 0x14200 pgdaemon pagedaemon 61093 218856 0 0 3 0x14200 bored viomb 29686 160971 0 0 3 0x40014200 acpi0 acpi0 91051 331418 0 0 3 0x40014200 idle1 1148 154192 0 0 3 0x14200 bored softnet3 74329 199262 0 0 3 0x14200 bored softnet2 5483 202955 0 0 3 0x14200 bored softnet1 59531 514858 0 0 3 0x14200 bored softnet0 52299 251431 0 0 3 0x14200 bored systqmp 52362 307159 0 0 3 0x14200 bored systq 67067 294920 0 0 3 0x14200 tmoslp softclockmp 74965 61354 0 0 3 0x40014200 tmoslp softclock 1453 107547 0 0 3 0x40014200 idle0 1 42292 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 16012 (syz-executor) thread 0xffff8000360c2cf8 (512563) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83906af8) #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 (0xffff80000149f928) #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 Process 9924 (syz-executor) thread 0xffff8000ffffacf0 (365246) exclusive rrwlock inode r = 0 (0xfffffd806de0aaa0) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3117 #10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c7dc998) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3102 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10203 11151K 11411K 166960K 11708 0 pcb 18 12K 12K 166960K 54 0 rtable 254 9K 9K 166960K 391 0 pf 39 18K 25K 166960K 68 0 ifaddr 45 8K 8K 166960K 57 0 ifgroup 57 2K 2K 166960K 74 0 sysctl 3 1K 1K 166960K 3 0 counters 68 36K 37K 166960K 96 0 ioctlops 0 0K 4K 166960K 1511 0 iov 0 0K 20K 166960K 13 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1368 86K 86K 166960K 1546 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 0K 166960K 11 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 358 0 sigio 0 0K 0K 166960K 6 0 proc 72 91K 128K 166960K 554 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 27 0 in_multi 99 7K 7K 166960K 104 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 400 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 220 72K 87K 166960K 4868 0 UVM aobj 69 3K 3K 166960K 69 0 pinsyscall 42 84K 104K 166960K 1446 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 16 0 NDP 13 0K 2K 166960K 35 0 temp 43 8636K 8702K 166960K 8555 0 kqueue 16 26K 30K 166960K 72 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 49 0 43 1 0 1 1 0 8 0 rtentry 112 120 0 6 4 0 4 4 0 8 0 unpcb 144 145 0 123 2 0 2 2 0 8 1 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 96 0 89 4 0 4 4 0 8 3 arp 120 19 0 1 1 0 1 1 0 8 0 inpcb 376 290 0 278 5 0 5 5 0 8 3 nd6 136 26 0 0 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 14 0 12 1 0 1 1 0 8 0 pppxif 1472 3 0 3 1 0 1 1 0 8 1 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 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 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 31 0 0 1 0 1 1 0 8 0 pfstkey 128 31 0 0 1 0 1 1 0 8 0 pfstate 376 31 0 0 4 0 4 4 0 8 0 pfrule 1344 23 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 468 0 7 29 0 29 29 0 8 0 art_table 32 469 0 7 4 0 4 4 0 8 0 art_node 16 118 0 15 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 66 0 0 2 0 2 2 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 1965 0 458 95 0 95 95 0 8 0 ffsino 280 1965 0 458 109 0 109 109 0 8 0 nchpl 144 2480 0 788 63 0 63 63 0 8 0 rtmask 32 5 0 5 1 0 1 1 0 8 1 uvmvnodes 80 2177 0 0 45 0 45 45 0 8 0 vnodes 216 2177 0 0 121 0 121 121 0 8 0 namei 1024 8040 0 8039 2 1 1 2 0 8 0 percpumem 16 62 0 14 1 0 1 1 0 8 0 kstatmem 264 38 0 12 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 7892 0 7891 4 2 2 2 1 8 1 plimitpl 152 61 0 44 1 0 1 1 0 8 0 sigapl 424 660 0 610 8 1 7 7 0 8 1 futexpl 64 3617 0 3615 1 0 1 1 0 8 0 knotepl 120 319 0 0 10 0 10 10 0 8 0 kqueuepl 216 96 0 83 1 0 1 1 0 8 0 pipepl 328 129 0 100 3 0 3 3 0 8 0 fdescpl 504 640 0 609 5 0 5 5 0 8 0 filepl 152 3077 0 2841 12 0 12 12 0 8 2 lockfpl 104 61 0 55 1 0 1 1 0 8 0 lockfspl 48 31 0 27 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 35 0 18 1 0 1 1 0 8 0 ucredpl 104 292 0 279 1 0 1 1 0 8 0 zombiepl 144 612 0 610 1 0 1 1 0 8 0 processpl 1176 660 0 610 5 0 5 5 0 8 0 procpl 656 1055 0 998 7 1 6 6 0 8 0 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 688 489 0 449 7 0 7 7 0 8 3 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 108 0 0 14 0 14 14 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mtagpl 96 38 0 0 1 0 1 1 0 8 0 mbufpl 256 204 0 0 13 0 13 13 0 8 0 bufpl 280 2919 0 133 199 0 199 199 0 8 0 anonpl 24 120923 0 117553 26 3 23 25 0 184 0 amapchunkpl 152 15383 0 14905 28 0 28 28 0 158 7 amappl16 200 2386 0 2355 6 3 3 5 0 8 0 amappl15 192 8 0 7 1 0 1 1 0 8 0 amappl14 184 116 0 104 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 1282 0 1251 4 1 3 3 0 8 0 amappl11 160 52 0 38 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 248 0 248 1 1 0 1 0 8 0 amappl8 136 22 0 20 1 0 1 1 0 8 0 amappl7 128 109 0 97 1 0 1 1 0 8 0 amappl6 120 181 0 177 1 0 1 1 0 8 0 amappl5 112 128 0 118 1 0 1 1 0 8 0 amappl4 104 321 0 302 1 0 1 1 0 8 0 amappl3 96 2753 0 2641 4 0 4 4 0 8 0 amappl2 88 656 0 594 2 0 2 2 0 8 0 amappl1 80 8886 0 8319 14 0 14 14 0 8 0 amappl 88 4476 0 4311 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 128 253 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 68 0 0 2 0 2 2 0 8 0 uaddrrnd 24 640 0 609 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 640 0 609 1 0 1 1 0 8 0 vmmpekpl 168 7002 0 6962 3 0 3 3 0 8 0 vmmpepl 168 45763 0 43906 90 0 90 90 0 357 6 vmsppl 456 639 0 609 5 0 5 5 0 8 1 rwobjpl 64 17945 0 14779 52 0 52 52 0 8 0 pdppl 4096 1287 0 1218 95 24 71 85 0 8 2 pvpl 32 10968 0 0 90 1 89 89 0 265 0 pmappl 248 639 0 609 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 272 0 27 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(fffffd806dd4cef8,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806dd4cee0,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806dd4cee0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd80607d6018,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd80607d6018,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd80607d6018,fffffd80607d6960,0,0,200,0,4c0f8812e6b48ac3) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd80607d6018,fffffd80607d6960,ffff8000360c2cf8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd807e23ae00,33,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff80000149f848,ffff8000324a9b78,ffff8000324a9b28,0,ffff8000324a9b68,ffff8000324a9cec,8a19a7e1dd38b4ae) at soreceive+0xc73 sys/kern/uipc_socket.c:1021 recvit(ffff8000360c2cf8,5,ffff8000324a9cc0,0,ffff8000324a9d70) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff8000360c2cf8,ffff8000324a9e20,ffff8000324a9d70) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff8000324a9e20) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000324a9e20) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x415c0554ec0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029a9bff0) 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 __mp_lock(ffffffff839068f0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839068f0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 syscall(ffff80003c4db620) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4db620) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6faeb7e258f0, count: -6