¹j¹j¼õ¬|ÿ ž¨E1\…:witness: lock order reversal: 1st 0xffff80000154ba58 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd805d6c4208 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff8340cb6d -> 0xffffffff8337ffd2 is missing lock order [2] inode (&ip->i_lock) -> [3] 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:878 #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:685 #7 vndioctl+0xdfc sys/dev/vnd.c:486 #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:765 #12 Xsyscall+0x128 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] sbufsnd (&so->so_snd.sb_lock) #0 rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 #1 sblock+0xb6 sys/kern/uipc_socket2.c:536 #2 sosplice+0x312 sys/kern/uipc_socket.c:1335 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1227 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #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:438 witness_checkorder(fffffd805d6c4208,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd805d6c41f0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd805d6c41f0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8070cec2b8,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd8070cec2b8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff800036c0f080) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff800036c0f080) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff80000154b870,fffffd805b899300,ffff80003c41cfb8) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff80000154b870,fffffd805d391900,fffffd805b899300,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff80000154b870,fffffd805b899300,ffff800036c0f308,0,0,e) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff80003c41cfb8,6,ffff800036c0f488,e,ffff800036c0f540) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff80003c41cfb8,ffff800036c0f5f0,ffff800036c0f540) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff800036c0f5f0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800036c0f5f0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7781f47d00, count: -15 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff800036c0ed00 rbx 0 rdx 0xffff800001473700 rcx 0xffff80003c41cfb8 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff800036c0ebe0 r9 0x8080808080808080 r10 0x99841ef3aae6760 r11 0xce88f18c30ffc274 r12 0xfffffd8003f458c0 r13 0xfffffd800472cd78 r14 0x3 r15 0xffffffff834145c3 substchar+0x7bc8 rip 0xffffffff82bb41e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800036c0ecf0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=465123 pid=48339 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c41c2c0,0xffff80003c41c800 process=0xffff80003c452b78 user=0xffff800036c0a000, vmspace=0xfffffd8062a1eba8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14771 336803 76141 0 7 0x100002 sh 48339 38849 16323 0 3 0x80 nanoslp syz-executor *48339 465123 16323 0 7 0x4000000 syz-executor 47530 499908 75248 0 3 0x90 nanoslp syz-executor 47530 446606 75248 0 3 0x4000090 sbwait syz-executor 47530 475757 75248 0 3 0x4000090 fsleep syz-executor 47530 173985 75248 0 3 0x4000090 fsleep syz-executor 20338 102671 72223 0 3 0x80 nanoslp syz-executor 20338 133874 72223 0 3 0x4000080 ttyout syz-executor 20338 25879 72223 0 3 0x4000080 fsleep syz-executor 76141 305204 75947 0 3 0x82 wait syz-executor 53606 400838 80987 0 3 0x80 nanoslp syz-executor 53606 288210 80987 0 3 0x4000080 kqsel syz-executor 57374 122905 96921 0 3 0x80 nanoslp syz-executor 57374 130575 96921 0 3 0x4000080 dtread syz-executor 57374 402839 96921 0 3 0x4000080 fsleep syz-executor 57374 391988 96921 0 3 0x4000080 fsleep syz-executor 80987 294395 75947 0 3 0x82 nanoslp syz-executor 75248 365931 75947 0 3 0x82 nanoslp syz-executor 72223 265514 75947 0 3 0x82 nanoslp syz-executor 19121 462521 75947 0 3 0x2 biowait syz-executor 16323 238548 75947 0 3 0x82 nanoslp syz-executor 34134 154542 75947 0 3 0x82 nanoslp syz-executor 96921 463138 75947 0 3 0x82 nanoslp syz-executor 75947 339751 71261 0 3 0x82 kqread syz-executor 71261 175304 37091 0 3 0x10008a sigsusp ksh 37091 328973 14024 0 3 0x98 kqread sshd-session 14024 183334 58915 0 3 0x92 kqread sshd-session 16396 96514 1 0 3 0x100083 ttyin getty 58915 225361 1 0 3 0x88 kqread sshd 85122 146660 92900 74 3 0x1100092 bpf pflogd 92900 268988 1 0 3 0x80 sbwait pflogd 67883 446569 41987 73 3 0x1100090 kqread syslogd 41987 59922 1 0 3 0x100082 sbwait syslogd 94245 53134 1 0 3 0x100080 kqread resolvd 41661 59525 95946 77 3 0x100092 kqread dhcpleased 60249 519535 95946 77 3 0x100092 kqread dhcpleased 95946 428254 1 0 3 0x80 kqread dhcpleased 62262 343965 0 0 3 0x14200 bored smr 25096 505125 0 0 3 0x14200 pgzero zerothread 89688 194213 0 0 3 0x14200 aiodoned aiodoned 117 74305 0 0 3 0x14200 syncer update 44687 201118 0 0 3 0x14200 cleaner cleaner 47563 32131 0 0 3 0x14200 reaper reaper 4898 433082 0 0 3 0x14200 pgdaemon pagedaemon 38870 287656 0 0 3 0x14200 bored viomb 33509 417187 0 0 3 0x40014200 acpi0 acpi0 27284 317591 0 0 3 0x40014200 idle1 28219 515841 0 0 3 0x14200 bored softnet1 74852 423439 0 0 3 0x14200 bored softnet0 63387 222666 0 0 3 0x14200 bored systqmp 27863 230383 0 0 3 0x14200 bored systq 957 389896 0 0 3 0x14200 tmoslp softclockmp 70944 378439 0 0 3 0x40014200 tmoslp softclock 40492 262327 0 0 3 0x40014200 idle0 1 374564 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 48339 (syz-executor) thread 0xffff80003c41cfb8 (465123) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a0a408) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 unp_connect+0x28c sys/kern/uipc_usrreq.c:872 #2 uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 #3 sosend+0x804 sys/kern/uipc_socket.c:-1 #4 sendit+0x5a5 sys/kern/uipc_syscalls.c:785 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #7 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff80000154ba58) #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 sosend+0x2e9 sys/kern/uipc_socket.c:639 #4 sendit+0x5a5 sys/kern/uipc_syscalls.c:785 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #7 Xsyscall+0x128 Process 19121 (syz-executor) thread 0xffff8000ffff2fa8 (462521) exclusive rrwlock inode r = 0 (0xfffffd805d6c40e0) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d30d578) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10483 12331K 12402K 166960K 13387 0 pcb 17 18K 19K 166960K 389 0 rtable 184 9K 10K 166960K 614 0 pf 34 17K 22K 166960K 255 0 ifaddr 32 5K 8K 166960K 115 0 ifgroup 52 2K 2K 166960K 197 0 sysctl 4 1K 9K 166960K 17 0 counters 66 36K 37K 166960K 216 0 ioctlops 0 0K 4K 166960K 1879 0 iov 0 0K 20K 166960K 60 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1460 92K 92K 166960K 2611 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 41 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 236K 166960K 1262 0 sigio 0 0K 0K 166960K 93 0 proc 73 115K 180K 166960K 676 0 subproc 72 4K 4K 166960K 100 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 150 0 in_multi 63 4K 7K 166960K 182 0 ether_multi 1 0K 0K 166960K 16 0 mrt 1 0K 0K 166960K 10 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 515 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 249 152K 174K 166960K 13026 0 UVM aobj 35 12K 12K 166960K 36 0 pinsyscall 42 84K 101K 166960K 2467 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 82 0 NDP 11 0K 2K 166960K 80 0 temp 65 8672K 8758K 166960K 51528 0 kqueue 14 22K 32K 166960K 299 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 129 0 126 1 0 1 1 0 8 0 rtentry 176 167 0 96 6 0 6 6 0 8 0 unpcb 144 983 0 962 11 5 6 6 0 8 5 syncache 336 9 0 9 3 2 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 736 442 0 436 14 12 2 13 0 8 1 arp 136 28 0 15 1 0 1 1 0 8 0 inpcb 328 1417 0 1407 19 12 7 12 0 8 5 nd6 152 34 0 18 1 0 1 1 0 8 0 pkpcb 40 4 0 4 3 3 0 1 0 8 0 kcovpl 48 11 0 3 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 57 0 57 2 1 1 1 0 8 1 pppxif 1504 6 0 6 2 1 1 1 0 8 1 pffrag 232 11 0 4 1 0 1 1 0 482 0 pffrnode 88 9 0 3 1 0 1 1 0 8 0 pffrent 40 19 0 12 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 9 0 9 1 1 0 1 0 8 0 pfanchor 1288 2 0 2 1 1 0 1 0 8 0 pfstitem 24 105 0 22 1 0 1 1 0 8 0 pfstkey 128 107 0 24 3 0 3 3 0 8 0 pfstate 448 105 0 23 10 0 10 10 0 8 0 pfrule 1344 113 0 108 3 2 1 2 0 8 0 rttmr 136 2 0 2 2 2 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 743 0 473 33 8 25 31 0 8 4 art_table 40 746 0 473 5 0 5 5 0 8 0 art_node 32 167 0 105 1 0 1 1 0 8 0 sysvmsgpl 40 49 0 20 1 0 1 1 0 8 0 semupl 112 6 0 6 2 1 1 1 0 8 1 semapl 112 36 0 26 1 0 1 1 0 8 0 shmpl 112 28 0 0 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 3665 0 2153 96 0 96 96 0 8 0 ffsino 296 3665 0 2153 117 0 117 117 0 8 0 nchpl 144 5316 0 3605 64 0 64 64 0 8 0 rtmask 32 8 0 8 2 1 1 1 0 8 1 vnodes 216 4567 0 0 254 0 254 254 0 8 0 namei 1024 18161 0 18159 3 2 1 2 0 8 0 percpumem 16 123 0 75 1 0 1 1 0 8 0 vcpupl 3968 4 0 0 1 0 1 1 0 8 0 vmpool 840 5 0 1 1 0 1 1 0 8 0 pfiaddrpl 120 7 0 7 1 1 0 1 0 8 0 kstatmem 264 122 0 98 3 1 2 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 9 0 9 2 1 1 1 0 8 1 scxspl 216 30161 0 30160 12 9 3 8 1 8 2 plimitpl 152 378 0 361 1 0 1 1 0 8 0 sigapl 424 1578 0 1531 8 2 6 7 0 8 0 knotepl 120 556 0 0 17 0 17 17 0 8 0 kqueuepl 224 457 0 445 4 2 2 3 0 8 1 pipepl 344 358 0 330 9 6 3 9 0 8 0 fdescpl 528 1540 0 1509 3 0 3 3 0 8 0 filepl 160 10032 0 9712 23 7 16 16 0 8 2 lockfpl 104 584 0 582 2 0 2 2 0 8 1 lockfspl 48 240 0 238 1 0 1 1 0 8 0 sessionpl 144 29 0 20 1 0 1 1 0 8 0 pgrppl 48 65 0 48 1 0 1 1 0 8 0 ucredpl 104 1507 0 1492 1 0 1 1 0 8 0 zombiepl 144 1532 0 1531 1 0 1 1 0 8 0 processpl 1232 1578 0 1531 6 1 5 5 0 8 0 procpl 664 3381 0 3324 6 0 6 6 0 8 0 sosppl 176 11 0 11 2 1 1 1 0 8 1 sockpl 752 2559 0 2525 37 26 11 17 0 8 7 mcl64k 65536 5 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 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 50 0 0 6 0 6 6 0 8 0 mtagpl 96 59 0 0 2 0 2 2 0 8 0 mbufpl 256 1207 0 0 76 0 76 76 0 8 0 bufpl 280 12598 0 6461 439 0 439 439 0 8 0 anonpl 32 12682 0 0 103 0 103 103 0 246 0 amapchunkpl 152 44804 0 44307 42 11 31 33 0 158 9 amappl16 200 5591 0 5562 44 32 12 25 0 8 6 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 6 0 6 2 1 1 1 0 8 1 amappl13 176 482 0 480 1 0 1 1 0 8 0 amappl12 168 1927 0 1885 3 0 3 3 0 8 0 amappl11 160 16 0 15 1 0 1 1 0 8 0 amappl10 152 90 0 76 1 0 1 1 0 8 0 amappl9 144 261 0 260 1 0 1 1 0 8 0 amappl8 136 26 0 24 1 0 1 1 0 8 0 amappl7 128 92 0 91 1 0 1 1 0 8 0 amappl6 120 312 0 297 1 0 1 1 0 8 0 amappl5 112 77 0 66 1 0 1 1 0 8 0 amappl4 104 448 0 419 1 0 1 1 0 8 0 amappl3 96 7564 0 7469 4 1 3 3 0 8 0 amappl2 88 1672 0 1596 2 0 2 2 0 8 0 amappl1 80 15008 0 14423 16 2 14 15 0 8 0 amappl 88 12057 0 11886 5 0 5 5 0 92 0 uvmvnodes 80 141 0 0 3 0 3 3 0 8 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 128 255 0 255 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 35 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1541 0 1510 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1541 0 1510 1 0 1 1 0 8 0 vmmpekpl 168 14285 0 14233 3 0 3 3 0 8 0 vmmpepl 168 103979 0 102076 107 6 101 107 0 357 12 vmsppl 488 1540 0 1510 8 3 5 5 0 8 0 rwobjpl 80 29777 0 28662 32 2 30 32 0 8 0 pdppl 4096 3099 0 3026 106 29 77 83 0 8 4 pvpl 32 20324 0 0 167 3 164 164 0 265 0 pmappl 256 1545 0 1511 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 378 0 56 10 0 10 10 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(fffffd805d6c4208,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd805d6c41f0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd805d6c41f0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8070cec2b8,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd8070cec2b8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff800036c0f080) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff800036c0f080) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff80000154b870,fffffd805b899300,ffff80003c41cfb8) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff80000154b870,fffffd805d391900,fffffd805b899300,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff80000154b870,fffffd805b899300,ffff800036c0f308,0,0,e) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff80003c41cfb8,6,ffff800036c0f488,e,ffff800036c0f540) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff80003c41cfb8,ffff800036c0f5f0,ffff800036c0f540) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff800036c0f5f0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800036c0f5f0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7781f47d00, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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(ffffffff83a0a200) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a0a200) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80002a302040) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002a302040) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70f3c7533c30, count: -6