witness: lock order reversal: 1st 0xffff800010fdb3b8 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806eecbdd0 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff834b62bf -> 0xffffffff834270be 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:537 #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:783 #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:1226 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #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(fffffd806eecbdd0,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806eecbdb8,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806eecbdb8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd800eff4290,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd800eff4290,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576 vfs_lookup(ffff80003bfeb1d0) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff80003bfeb1d0) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fdb1d0,fffffd806d096500,ffff80003c3c82b8) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff800010fdb1d0,fffffd806d239100,fffffd806d096500,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff800010fdb1d0,fffffd806d096500,ffff80003bfeb458,0,0,a) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff80003c3c82b8,3,ffff80003bfeb5d8,a,ffff80003bfeb690) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff80003c3c82b8,ffff80003bfeb740,ffff80003bfeb690) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff80003bfeb740) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bfeb740) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a1556f1040, count: -15 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003bfeae40 rbx 0 rdx 0xffff8000015ccf80 rcx 0xffff80003c3c82b8 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003bfead20 r9 0x8080808080808080 r10 0xfc56933663d288b6 r11 0x28c41c7b2116d68a r12 0xfffffd80040458c0 r13 0xfffffd800482d9b0 r14 0x3 r15 0xffffffff834baf55 substchar+0xcb56 rip 0xffffffff8204f125 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003bfeae30 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=51129 pid=89763 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=0xffff80003c3c8550,0xffff80003c3c8a90 process=0xffff80002a38dcf8 user=0xffff80003bfe6000, vmspace=0xfffffd806c53f020 estcpu=30, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 94358 239330 57689 0 2 0 syz-executor 94358 811 57689 0 2 0x4000000 syz-executor 62008 95091 80830 0 3 0x3000 suspend syz-executor 62008 65232 80830 0 2 0x4081000 syz-executor 62008 447424 80830 0 2 0x4081000 syz-executor 62008 170658 80830 0 2 0x4081000 syz-executor 89763 302836 93547 0 2 0 syz-executor *89763 51129 93547 0 7 0x4000000 syz-executor 29186 407672 51676 0 2 0 syz-executor 29186 77500 51676 0 3 0x4000080 fsleep syz-executor 29186 12576 51676 0 3 0x4000080 fsleep syz-executor 18297 177960 35654 0 2 0 syz-executor 18297 206111 35654 0 3 0x4000080 lockf syz-executor 18297 484736 35654 0 3 0x4000080 fsleep syz-executor 44768 508080 54276 0 2 0 syz-executor 44768 145352 54276 0 3 0x4000080 fifor syz-executor 44768 85233 54276 0 3 0x4000080 fsleep syz-executor 3481 494161 48860 0 2 0 syz-executor 3481 135287 48860 0 3 0x4000080 msgwait syz-executor 3481 80477 48860 0 3 0x4000080 msgwait syz-executor 3481 272262 48860 0 3 0x4000080 fsleep syz-executor 5935 218013 93062 0 7 0 syz-executor 5935 42487 93062 0 3 0x4000080 fsleep syz-executor 5935 492937 93062 0 3 0x4000080 fsleep syz-executor 93062 432320 65282 0 3 0x82 nanoslp syz-executor 57689 257269 65282 0 3 0x82 nanoslp syz-executor 80830 158895 65282 0 3 0x82 nanoslp syz-executor 54276 105776 65282 0 3 0x82 nanoslp syz-executor 35654 199245 65282 0 3 0x82 nanoslp syz-executor 51676 213706 65282 0 3 0x82 nanoslp syz-executor 48860 75462 65282 0 3 0x82 nanoslp syz-executor 93547 255291 65282 0 3 0x82 nanoslp syz-executor 65282 185526 19553 0 3 0x82 kqread syz-executor 19553 461263 68117 0 3 0x10008a sigsusp ksh 68117 73725 27153 0 3 0x98 kqread sshd-session 27153 184969 91145 0 3 0x92 kqread sshd-session 87338 11398 1 0 3 0x100083 ttyopn getty 91145 118190 1 0 3 0x88 kqread sshd 51367 454606 47754 74 3 0x1100092 bpf pflogd 47754 495744 1 0 3 0x80 sbwait pflogd 76174 324281 68423 73 3 0x1100090 kqread syslogd 68423 227934 1 0 3 0x100082 sbwait syslogd 74844 123597 1 0 3 0x100080 kqread resolvd 11950 440380 78596 77 3 0x100092 kqread dhcpleased 13082 323448 78596 77 3 0x100092 kqread dhcpleased 78596 495663 1 0 3 0x80 kqread dhcpleased 85039 118851 0 0 3 0x14200 bored smr 80298 307620 0 0 2 0x14200 zerothread 36436 221298 0 0 3 0x14200 aiodoned aiodoned 13421 402230 0 0 3 0x14200 syncer update 59655 302249 0 0 3 0x14200 cleaner cleaner 15808 305121 0 0 3 0x14200 reaper reaper 29294 469873 0 0 3 0x14200 pgdaemon pagedaemon 54350 213189 0 0 3 0x14200 bored viomb 16099 118645 0 0 3 0x40014200 acpi0 acpi0 39830 368193 0 0 3 0x40014200 idle1 24430 54689 0 0 3 0x14200 bored softnet1 25127 302939 0 0 2 0x14200 softnet0 73469 36406 0 0 3 0x14200 bored systqmp 29299 78655 0 0 3 0x14200 bored systq 29435 80706 0 0 3 0x14200 tmoslp softclockmp 14370 282153 0 0 3 0x40014200 tmoslp softclock 12349 358738 0 0 3 0x40014200 idle0 1 361202 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 89763 (syz-executor) thread 0xffff80003c3c82b8 (51129) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a0ec00) #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:783 #7 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff800010fdb3b8) #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:783 #7 Xsyscall+0x128 Process 5935 (syz-executor) thread 0xffff8000fffeefa8 (218013) exclusive rwlock uobjlk r = 0 (0xfffffd80711909f8) #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 uvm_fault+0x1e5 sys/uvm/uvm_fault.c:649 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #4 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806c53f308) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11071 12105K 12553K 166960K 12403 0 pcb 19 12K 12K 166960K 54 0 rtable 235 8K 8K 166960K 419 0 pf 38 18K 24K 166960K 82 0 ifaddr 42 7K 7K 166960K 61 0 ifgroup 60 2K 2K 166960K 85 0 sysctl 2 1K 9K 166960K 7 0 counters 72 37K 38K 166960K 104 0 ioctlops 0 0K 4K 166960K 1533 0 iov 0 0K 4K 166960K 39 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1293 81K 82K 166960K 1542 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 0K 166960K 12 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 346 0 sigio 0 0K 0K 166960K 7 0 proc 71 115K 180K 166960K 609 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 21 0 in_multi 94 6K 7K 166960K 116 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 10 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 417 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 248 168K 180K 166960K 5035 0 UVM aobj 8 2K 2K 166960K 10 0 pinsyscall 43 86K 104K 166960K 1539 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 8 0 NDP 13 0K 2K 166960K 39 0 temp 46 9076K 9147K 166960K 8086 0 kqueue 13 20K 26K 166960K 46 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 45 0 41 1 0 1 1 0 8 0 rtentry 176 126 0 23 6 0 6 6 0 8 0 unpcb 144 187 0 167 2 0 2 2 0 8 1 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 50 0 45 1 0 1 1 0 8 0 arp 136 20 0 4 1 0 1 1 0 8 0 inpcb 328 202 0 191 2 0 2 2 0 8 1 nd6 152 28 0 5 1 0 1 1 0 8 0 pkpcb 40 5 0 5 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 12 0 12 1 0 1 1 0 8 1 pppxif 1576 2 0 2 1 1 0 1 0 8 0 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pffrag 232 3 0 0 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 3 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 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfstitem 24 31 0 0 1 0 1 1 0 8 0 pfstkey 128 33 0 2 2 0 2 2 0 8 1 pfstate 448 32 0 1 4 0 4 4 0 8 0 pfrule 1360 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 508 0 70 29 0 29 29 0 8 1 art_table 40 510 0 70 5 0 5 5 0 8 0 art_node 32 126 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 5 1 0 1 1 0 8 0 semapl 112 10 0 2 1 0 1 1 0 8 0 shmpl 112 7 0 2 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 1954 0 488 93 0 93 93 0 8 0 ffsino 296 1954 0 488 114 0 114 114 0 8 0 nchpl 144 2423 0 714 64 0 64 64 0 8 0 rtmask 32 5 0 5 1 0 1 1 0 8 1 vnodes 216 2143 0 0 120 0 120 120 0 8 0 namei 1024 7558 0 7557 1 0 1 1 0 8 0 percpumem 16 67 0 16 1 0 1 1 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 kstatmem 264 45 0 16 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 8202 0 8202 3 2 1 2 1 8 1 plimitpl 152 56 0 38 1 0 1 1 0 8 0 sigapl 424 665 0 617 7 1 6 7 0 8 0 knotepl 120 308 0 0 10 0 10 10 0 8 0 kqueuepl 224 60 0 51 1 0 1 1 0 8 0 pipepl 344 140 0 112 3 0 3 3 0 8 0 fdescpl 528 649 0 617 3 0 3 3 0 8 0 filepl 160 2675 0 2452 11 0 11 11 0 8 1 lockfpl 104 121 0 117 1 0 1 1 0 8 0 lockfspl 48 59 0 56 1 0 1 1 0 8 0 sessionpl 144 30 0 21 1 0 1 1 0 8 0 pgrppl 48 42 0 25 1 0 1 1 0 8 0 ucredpl 104 314 0 301 1 0 1 1 0 8 0 zombiepl 144 618 0 617 1 0 1 1 0 8 0 processpl 1232 665 0 617 5 1 4 5 0 8 0 procpl 664 1009 0 945 6 0 6 6 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 447 0 412 7 0 7 7 0 8 3 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 113 0 0 15 0 15 15 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 145 0 0 10 0 10 10 0 8 0 bufpl 280 2851 0 105 197 0 197 197 0 8 0 anonpl 32 6537 0 0 53 0 53 53 0 246 0 amapchunkpl 152 15613 0 14954 29 2 27 29 0 158 1 amappl16 200 2273 0 2243 5 2 3 5 0 8 0 amappl15 192 17 0 17 1 1 0 1 0 8 0 amappl14 184 449 0 448 1 0 1 1 0 8 0 amappl13 176 125 0 112 1 0 1 1 0 8 0 amappl12 168 913 0 882 2 0 2 2 0 8 0 amappl11 160 8 0 8 1 1 0 1 0 8 0 amappl10 152 104 0 90 1 0 1 1 0 8 0 amappl9 144 263 0 263 1 1 0 1 0 8 0 amappl8 136 115 0 112 1 0 1 1 0 8 0 amappl7 128 152 0 139 1 0 1 1 0 8 0 amappl6 120 171 0 168 1 0 1 1 0 8 0 amappl5 112 97 0 87 1 0 1 1 0 8 0 amappl4 104 299 0 279 1 0 1 1 0 8 0 amappl3 96 2813 0 2687 4 0 4 4 0 8 0 amappl2 88 546 0 483 2 0 2 2 0 8 0 amappl1 80 10314 0 9718 14 1 13 14 0 8 0 amappl 88 4253 0 4076 4 0 4 4 0 92 0 uvmvnodes 80 109 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 128 254 0 254 2 2 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 9 0 2 1 0 1 1 0 8 0 uaddrrnd 24 649 0 617 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 649 0 617 1 0 1 1 0 8 0 vmmpekpl 168 6902 0 6862 2 0 2 2 0 8 0 vmmpepl 168 48775 0 46801 87 0 87 87 0 357 1 vmsppl 488 648 0 617 5 0 5 5 0 8 0 rwobjpl 80 16518 0 15453 23 0 23 23 0 8 0 pdppl 4096 1305 0 1234 113 42 71 85 0 8 0 pvpl 32 13726 0 0 111 0 111 111 0 265 0 pmappl 256 648 0 617 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 286 0 46 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff83914ff0) 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(ffffffff83a0e400) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a0e400) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003bfc7220,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff83a0e400) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a0e400) at __mp_lock+0x199 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff83a0e400) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a0e400) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 uvm_fault(fffffd806c53f208,c527684d000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff80003bfc7760,c527684d000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003bfc7760) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x6fc88314b940, count: -16 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(fffffd806eecbdd0,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806eecbdb8,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806eecbdb8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd800eff4290,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd800eff4290,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576 vfs_lookup(ffff80003bfeb1d0) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff80003bfeb1d0) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fdb1d0,fffffd806d096500,ffff80003c3c82b8) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff800010fdb1d0,fffffd806d239100,fffffd806d096500,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff800010fdb1d0,fffffd806d096500,ffff80003bfeb458,0,0,a) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff80003c3c82b8,3,ffff80003bfeb5d8,a,ffff80003bfeb690) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff80003c3c82b8,ffff80003bfeb740,ffff80003bfeb690) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff80003bfeb740) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bfeb740) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a1556f1040, count: -15