witness: lock order reversal: 1st 0xffff800010fdaad0 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806a0a0b48 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83412b2d -> 0xffffffff83384f88 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:890 #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:775 #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:1347 #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:775 #5 Xsyscall+0x128 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(fffffd806a0a0b48,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806a0a0b30,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806a0a0b30,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8069eb9608,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd8069eb9608,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c436fa0) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff80003c436fa0) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fda8e8,fffffd807eb52100,ffff8000fffea7e8) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff800010fda8e8,fffffd806a078500,fffffd807eb52100,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff800010fda8e8,fffffd807eb52100,ffff80003c437228,0,0,e) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff8000fffea7e8,3,ffff80003c4373a8,e,ffff80003c437460) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff8000fffea7e8,ffff80003c437510,ffff80003c437460) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff80003c437510) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c437510) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3e9d9f1f090, count: -15 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c436c10 rbx 0 rdx 0xffff800001588780 rcx 0xffff8000fffea7e8 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c436af0 r9 0x8080808080808080 r10 0x263fdc23df351a11 r11 0x29a34e21e8d2f5b1 r12 0xfffffd8003f5c8c0 r13 0xfffffd80047443d8 r14 0x3 r15 0xffffffff8341c190 substchar+0x3540 rip 0xffffffff831ea265 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c436c00 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=437749 pid=57102 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=78, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffead18,0xffffffff83940818 process=0xffff80003c4104f0 user=0xffff80003c432000, vmspace=0xfffffd806c7bf7c0 estcpu=28, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 67684 94352 44513 0 7 0 syz-executor 67684 237415 44513 0 3 0x4000080 wsevent_read syz-executor 57102 234299 94605 -1 2 0x10 syz-executor 57102 220942 94605 -1 2 0x4000010 syz-executor *57102 437749 94605 -1 7 0x4000010 syz-executor 50529 85522 52689 0 2 0 syz-executor 50529 348555 52689 0 3 0x4000080 fsleep syz-executor 50529 249979 52689 0 3 0x4000080 fsleep syz-executor 36156 219054 0 0 3 0x14200 acct acct 92005 191092 15730 0 3 0x3000 suspend syz-executor 92005 26428 15730 0 3 0x4081000 biowait syz-executor 63252 133315 98438 0 3 0x3000 suspend syz-executor 63252 333356 98438 0 3 0x4081000 biowait syz-executor 63252 201163 98438 0 3 0x4081000 inode syz-executor 8750 24530 767 0 3 0x100082 sbwait arp 767 135876 7225 0 3 0x10008a sigsusp sh 94605 66557 79106 0 3 0x82 nanoslp syz-executor 44513 507074 79106 0 3 0x82 nanoslp syz-executor 98438 79678 79106 0 3 0x82 wait syz-executor 8339 318844 79106 0 2 0x2 syz-executor 15730 461468 79106 0 3 0x82 nanoslp syz-executor 31860 490920 79106 0 3 0x82 nanoslp syz-executor 52689 77195 79106 0 3 0x82 nanoslp syz-executor 7225 205556 79106 0 3 0x82 wait syz-executor 79106 336605 88067 0 3 0x82 kqread syz-executor 88067 8196 14267 0 3 0x10008a sigsusp ksh 14267 372725 66244 0 3 0x98 kqread sshd-session 66244 218543 72279 0 3 0x92 kqread sshd-session 53658 401524 1 0 3 0x100083 ttyin getty 72279 308308 1 0 3 0x88 kqread sshd 33261 37066 81477 74 3 0x1100092 bpf pflogd 81477 370091 1 0 3 0x80 sbwait pflogd 54916 73453 18429 73 3 0x1100090 kqread syslogd 18429 227617 1 0 3 0x100082 sbwait syslogd 45783 208364 1 0 3 0x100080 kqread resolvd 46419 228771 50200 77 3 0x100092 kqread dhcpleased 92205 23666 50200 77 3 0x100092 kqread dhcpleased 50200 474142 1 0 3 0x80 kqread dhcpleased 3292 409838 0 0 3 0x14200 bored smr 41843 244845 0 0 3 0x14200 pgzero zerothread 40591 131165 0 0 3 0x14200 aiodoned aiodoned 50183 155958 0 0 3 0x14200 syncer update 32377 39997 0 0 3 0x14200 cleaner cleaner 25847 448401 0 0 3 0x14200 reaper reaper 52624 135086 0 0 3 0x14200 pgdaemon pagedaemon 77419 10147 0 0 3 0x14200 bored viomb 23968 100836 0 0 3 0x40014200 acpi0 acpi0 80347 459674 0 0 3 0x40014200 idle1 22372 369132 0 0 3 0x14200 bored softnet1 87022 379271 0 0 2 0x14200 softnet0 90799 227603 0 0 3 0x14200 bored systqmp 97362 62627 0 0 3 0x14200 bored systq 28630 434631 0 0 3 0x14200 tmoslp softclockmp 61555 473857 0 0 3 0x40014200 tmoslp softclock 43077 379290 0 0 3 0x40014200 idle0 1 55777 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 57102 (syz-executor) thread 0xffff8000fffea7e8 (437749) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839333c0) #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:775 #7 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff800010fdaad0) #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:775 #7 Xsyscall+0x128 Process 92005 (syz-executor) thread 0xffff8000fffeba10 (26428) exclusive rrwlock inode r = 0 (0xfffffd806a0a0458) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 63252 (syz-executor) thread 0xffff8000fffea2b8 (333356) exclusive rrwlock inode r = 0 (0xfffffd806a0a07d0) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 63252 (syz-executor) thread 0xffff8000fffeaa80 (201163) exclusive rrwlock inode r = 0 (0xfffffd806eb7a490) #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+0xbd 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 vn_open+0x1f1 sys/kern/vfs_vnops.c:107 #8 doopenat+0x35b sys/kern/vfs_syscalls.c:1138 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #10 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11067 12163K 14069K 166960K 12616 0 pcb 17 14K 16K 166960K 131 0 rtable 228 8K 8K 166960K 367 0 pf 38 18K 18K 166960K 68 0 ifaddr 42 7K 7K 166960K 61 0 ifgroup 57 2K 2K 166960K 87 0 sysctl 3 1K 9K 166960K 7 0 counters 74 37K 38K 166960K 108 0 ioctlops 0 0K 4K 166960K 1627 0 iov 0 0K 12K 166960K 46 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1434 90K 90K 166960K 1597 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 8 0K 0K 166960K 8 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 244K 166960K 345 0 sigio 0 0K 0K 166960K 4 0 proc 73 131K 164K 166960K 556 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 32 0 in_multi 89 6K 6K 166960K 103 0 ether_multi 1 0K 0K 166960K 7 0 mrt 1 0K 0K 166960K 5 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 486 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 257 169K 184K 166960K 5007 0 UVM aobj 3 2K 4K 166960K 4 0 pinsyscall 44 88K 106K 166960K 1447 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 12 0 NDP 13 0K 1K 166960K 38 0 temp 39 8678K 8743K 166960K 16994 0 kqueue 15 24K 31K 166960K 83 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 43 0 38 1 0 1 1 0 8 0 rtentry 176 111 0 11 5 0 5 5 0 8 0 unpcb 144 158 0 135 2 0 2 2 0 8 1 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 63 0 59 1 0 1 1 0 8 0 arp 136 17 0 0 1 0 1 1 0 8 0 inpcb 328 405 0 397 10 1 9 10 0 8 8 nd6 152 22 0 0 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 16 0 14 1 0 1 1 0 8 0 pppxif 1504 3 0 3 1 0 1 1 0 8 1 pffrag 232 4 0 0 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 4 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 pfsrclim 320 1 0 1 1 1 0 1 0 8 0 pfstkey 128 2 0 2 1 0 1 1 0 8 1 pfstate 448 2 0 2 1 0 1 1 0 8 1 pfrule 1360 1 0 1 1 0 1 1 0 8 1 rttmr 136 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 486 0 79 28 0 28 28 0 8 2 art_table 40 487 0 79 5 0 5 5 0 8 0 art_node 32 109 0 18 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 1 0 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1964 0 451 95 0 95 95 0 8 0 ffsino 296 1964 0 451 117 0 117 117 0 8 0 nchpl 144 2465 0 759 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 vnodes 216 2206 0 0 123 0 123 123 0 8 0 namei 1024 8065 0 8063 1 0 1 1 0 8 0 percpumem 16 69 0 17 1 0 1 1 0 8 0 vmpool 848 1 0 1 1 0 1 1 0 8 1 kstatmem 264 50 0 22 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 12832 0 12830 10 2 8 8 1 8 7 plimitpl 152 66 0 47 1 0 1 1 0 8 0 sigapl 424 645 0 596 7 0 7 7 0 8 0 knotepl 120 316 0 0 10 0 10 10 0 8 0 kqueuepl 224 131 0 120 3 1 2 3 0 8 1 pipepl 344 167 0 140 6 1 5 6 0 8 2 fdescpl 528 624 0 592 3 0 3 3 0 8 0 filepl 160 3174 0 2945 17 0 17 17 0 8 7 lockfpl 104 281 0 276 1 0 1 1 0 8 0 lockfspl 48 48 0 43 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 257 0 243 1 0 1 1 0 8 0 zombiepl 144 599 0 596 1 0 1 1 0 8 0 processpl 1232 645 0 596 5 0 5 5 0 8 0 procpl 664 1005 0 948 6 0 6 6 0 8 0 sosppl 176 7 0 7 1 0 1 1 0 8 1 sockpl 752 613 0 577 14 2 12 14 0 8 8 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 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 17 0 17 17 0 8 0 mcl2k 2048 41 0 0 6 0 6 6 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1152 0 0 72 0 72 72 0 8 0 bufpl 280 5206 0 131 363 0 363 363 0 8 0 anonpl 32 9066 0 0 74 0 74 74 0 246 0 amapchunkpl 152 15782 0 15281 31 0 31 31 0 158 9 amappl16 200 2856 0 2633 19 3 16 17 0 8 4 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 8 0 8 1 1 0 1 0 8 0 amappl13 176 420 0 417 1 0 1 1 0 8 0 amappl12 168 1015 0 971 3 0 3 3 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 48 0 34 1 0 1 1 0 8 0 amappl9 144 263 0 263 1 1 0 1 0 8 0 amappl8 136 30 0 27 1 0 1 1 0 8 0 amappl7 128 77 0 76 1 0 1 1 0 8 0 amappl6 120 279 0 264 1 0 1 1 0 8 0 amappl5 112 87 0 76 1 0 1 1 0 8 0 amappl4 104 409 0 377 1 0 1 1 0 8 0 amappl3 96 2471 0 2376 4 1 3 3 0 8 0 amappl2 88 733 0 657 2 0 2 2 0 8 0 amappl1 80 9732 0 9117 15 1 14 14 0 8 0 amappl 88 4257 0 4084 5 0 5 5 0 92 0 uvmvnodes 80 114 0 0 3 0 3 3 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 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 2 1 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 3 0 1 1 0 1 1 0 8 0 uaddrrnd 24 624 0 592 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 624 0 592 1 0 1 1 0 8 0 vmmpekpl 168 7055 0 7021 2 0 2 2 0 8 0 vmmpepl 168 47416 0 45270 100 0 100 100 0 357 6 vmsppl 488 623 0 592 5 0 5 5 0 8 0 rwobjpl 80 16384 0 15108 29 0 29 29 0 8 0 pdppl 4096 1257 0 1186 97 24 73 85 0 8 2 pvpl 32 18054 0 0 147 1 146 146 0 265 0 pmappl 256 624 0 593 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 333 0 27 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff83864ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x25 kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x25 sys/dev/kcov.c:153 __mp_lock(ffffffff83932bc0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83932bc0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 intr_handler(ffff80002efcc250,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff83932bc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83932bc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80002efcc3b0,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x78a1b20d43b0, count: -10 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(fffffd806a0a0b48,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806a0a0b30,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806a0a0b30,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8069eb9608,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd8069eb9608,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c436fa0) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff80003c436fa0) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fda8e8,fffffd807eb52100,ffff8000fffea7e8) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff800010fda8e8,fffffd806a078500,fffffd807eb52100,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff800010fda8e8,fffffd807eb52100,ffff80003c437228,0,0,e) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff8000fffea7e8,3,ffff80003c4373a8,e,ffff80003c437460) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff8000fffea7e8,ffff80003c437510,ffff80003c437460) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff80003c437510) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c437510) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3e9d9f1f090, count: -15