witness: lock order reversal: 1st 0xffff80000128e480 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806a981858 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83120c01 -> 0xffffffff830cf67f is missing lock order [2] inode (&ip->i_lock) -> [3] 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:537 #2 soreceive+0x28e sys/kern/uipc_socket.c:876 #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 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] sbufsnd (&so->so_snd.sb_lock) #0 rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 #1 sblock+0xb7 sys/kern/uipc_socket2.c:537 #2 sosplice+0x40d sys/kern/uipc_socket.c:1358 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1221 #4 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #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:437 witness_checkorder(fffffd806a981858,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806a981840,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806a981840,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd806e7d2d80,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806e7d2d80,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c5cc528) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff80003c5cc528) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff80000128e2c0,fffffd807a80be00,ffff80002a44ecc8) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff80000128e2c0,fffffd807a80a900,fffffd807a80be00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff80000128e2c0,fffffd807a80be00,ffff80003c5cc7a8,0,0,0) at sosend+0x804 sendit(ffff80002a44ecc8,3,ffff80003c5cc920,0,ffff80003c5cc9e0) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff80002a44ecc8,ffff80003c5cca90,ffff80003c5cc9e0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff80003c5cca90) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5cca90) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8abf9cd6530, count: -15 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c5cc1a0 rbx 0xfffffd800433f570 rdx 0xffff80000128d740 rcx 0xffff80002a44ecc8 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c5cc080 r9 0x8080808080808080 r10 0xa4b9aade43f74bda r11 0x9cd2db9ef7516e08 r12 0 r13 0xfffffd8003b56f00 r14 0x3 r15 0xffffffff rip 0xffffffff82a6fbd5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c5cc190 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=211883 pid=7642 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=0xffff80002a44f1d8,0xffffffff8360c558 process=0xffff80003c5abda8 user=0xffff80003c5c7000, vmspace=0xfffffd806d6e7ca8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 7642 489373 29122 0 3 0x80 fsleep syz-executor * 7642 211883 29122 0 7 0x4000000 syz-executor 77329 334241 28521 0 3 0x80 fsleep syz-executor 77329 296052 28521 0 3 0x4000080 ttyopn syz-executor 69782 509028 40588 0 3 0x80 fsleep syz-executor 69782 124428 40588 0 3 0x4000080 bpf syz-executor 8436 88490 4569 0 3 0x80 fsleep syz-executor 8436 482117 4569 0 3 0x4000080 netcon syz-executor 51750 120594 78447 0 3 0x80 fsleep syz-executor 51750 45943 78447 0 3 0x4000080 netacc syz-executor 35220 445774 96038 0 3 0x90 fsleep syz-executor 35220 20857 96038 0 3 0x4000090 ttyout syz-executor 52202 520383 6540 0 3 0x80 fsleep syz-executor 52202 60424 6540 0 3 0x4000080 ttyout syz-executor 6540 381227 33343 0 3 0x82 nanoslp syz-executor 28521 108395 33343 0 3 0x82 nanoslp syz-executor 87746 473473 1 0 3 0x80 nanoslp init 58690 267290 33343 0 3 0x82 wait syz-executor 96038 59513 33343 0 3 0x82 nanoslp syz-executor 78447 380363 33343 0 3 0x82 nanoslp syz-executor 14780 50960 0 0 3 0x14280 nfsidl nfsio 44852 298538 0 0 3 0x14280 nfsidl nfsio 90745 171611 0 0 3 0x14280 nfsidl nfsio 78106 235382 0 0 3 0x14280 nfsidl nfsio 7014 84337 0 0 3 0x14280 nfsidl nfsio 45951 67586 0 0 3 0x14280 nfsidl nfsio 11795 267840 0 0 3 0x14280 nfsidl nfsio 55750 208968 0 0 3 0x14280 nfsidl nfsio 19493 296226 0 0 3 0x14280 nfsidl nfsio 67944 403964 0 0 3 0x14280 nfsidl nfsio 18545 253475 0 0 3 0x14280 nfsidl nfsio 58436 287198 0 0 3 0x14280 nfsidl nfsio 24231 316670 0 0 3 0x14280 nfsidl nfsio 77565 66708 0 0 3 0x14280 nfsidl nfsio 46338 435308 0 0 3 0x14280 nfsidl nfsio 92572 269620 0 0 3 0x14280 nfsidl nfsio 52018 241395 0 0 3 0x14280 nfsidl nfsio 14551 182045 0 0 3 0x14280 nfsidl nfsio 16347 253979 0 0 3 0x14280 nfsidl nfsio 14421 413316 0 0 3 0x14280 nfsidl nfsio 4569 421912 33343 0 3 0x82 nanoslp syz-executor 95362 101425 0 0 3 0x14200 bored sosplice 29122 363186 33343 0 3 0x82 nanoslp syz-executor 40588 449911 33343 0 3 0x82 nanoslp syz-executor 33343 374934 52167 0 3 0x82 kqread syz-executor 52167 294802 22659 0 3 0x10008a sigsusp ksh 22659 188844 52898 0 3 0x98 kqread sshd-session 52898 17588 58923 0 3 0x92 kqread sshd-session 58923 180904 1 0 3 0x88 kqread sshd 73158 141994 76357 74 3 0x1100092 bpf pflogd 76357 446298 1 0 3 0x80 sbwait pflogd 74099 8861 63443 73 3 0x1100090 kqread syslogd 63443 257237 1 0 3 0x100082 sbwait syslogd 84688 398101 1 0 3 0x100080 kqread resolvd 56873 338230 82179 77 3 0x100092 kqread dhcpleased 76497 267329 82179 77 3 0x100092 kqread dhcpleased 82179 114815 1 0 3 0x80 kqread dhcpleased 78887 437295 0 0 3 0x14200 bored smr 973 490306 0 0 3 0x14200 pgzero zerothread 34207 195799 0 0 3 0x14200 aiodoned aiodoned 56522 340383 0 0 3 0x14200 syncer update 97334 84306 0 0 3 0x14200 cleaner cleaner 46227 197327 0 0 3 0x14200 reaper reaper 78154 81750 0 0 3 0x14200 pgdaemon pagedaemon 70420 313407 0 0 3 0x14200 bored viomb 18632 44618 0 0 3 0x40014200 acpi0 acpi0 92239 390974 0 0 3 0x40014200 idle1 4446 382767 0 0 3 0x14200 bored softnet3 13699 204908 0 0 3 0x14200 bored softnet2 48685 49606 0 0 3 0x14200 bored softnet1 43777 164791 0 0 2 0x14200 softnet0 4912 197068 0 0 3 0x14200 bored systqmp 22595 281769 0 0 3 0x14200 bored systq 77054 307179 0 0 3 0x14200 tmoslp softclockmp 3148 281585 0 0 3 0x40014200 tmoslp softclock 77932 142631 0 0 7 0x40014200 idle0 1 469506 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 7642 (syz-executor) thread 0xffff80002a44ecc8 (211883) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8360db10) #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+0x804 #4 sendit+0x721 sys/kern/uipc_syscalls.c:779 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 #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 exclusive rwlock sbufsnd r = 0 (0xffff80000128e480) #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:537 #3 sosend+0x2e2 sys/kern/uipc_socket.c:625 #4 sendit+0x721 sys/kern/uipc_syscalls.c:779 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10220 11128K 11581K 166960K 18671 0 pcb 17 20K 25K 166960K 1153 0 rtable 172 7K 7K 166960K 1261 0 pf 40 18K 22K 166960K 245 0 ifaddr 39 7K 7K 166960K 170 0 ifgroup 66 2K 3K 166960K 267 0 sysctl 4 1K 2K 166960K 16 0 counters 68 36K 37K 166960K 200 0 ioctlops 0 0K 4K 166960K 2167 0 iov 1 0K 24K 166960K 413 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1453 91K 92K 166960K 5077 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 93 0 VM map 2 1K 1K 166960K 2 0 sem 24 29K 49K 166960K 50 0 dirhash 12 2K 2K 166960K 111 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 97K 166960K 4794 0 sigio 0 0K 0K 166960K 122 0 proc 63 79K 140K 166960K 1279 0 subproc 72 4K 4K 166960K 145 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 849 0 in_multi 63 5K 7K 166960K 357 0 ether_multi 1 0K 0K 166960K 49 0 mrt 1 0K 0K 166960K 18 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 1371 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 5 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 240 74K 88K 166960K 46003 0 UVM aobj 131 10K 10K 166960K 141 0 pinsyscall 42 84K 108K 166960K 6112 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 253 0 NDP 14 0K 2K 166960K 121 0 temp 80 6900K 7156K 166960K 192287 0 kqueue 13 20K 30K 166960K 692 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 529 0 526 6 5 1 3 0 8 0 rtentry 112 390 0 318 4 1 3 4 0 8 0 unpcb 144 3622 0 3602 16 12 4 6 0 8 3 syncache 336 6 0 6 3 3 0 1 0 8 0 sackhl 24 3 0 3 2 2 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 1619 0 1610 25 21 4 8 0 8 2 arp 120 90 0 77 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 376 5977 0 5963 51 42 9 15 0 8 6 nd6 136 63 0 49 1 0 1 1 0 8 0 pkpcb 40 21 0 21 5 4 1 1 0 8 1 kcovpl 48 16 0 8 1 0 1 1 0 8 0 ppxss 1168 41 0 41 6 5 1 1 0 8 1 pffrag 232 23 0 16 1 0 1 1 0 482 0 pffrnode 88 20 0 13 1 0 1 1 0 8 0 pffrent 40 79 0 72 2 1 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 1 1 1 0 1 0 8 0 pfanchor 1288 5 0 0 1 0 1 1 0 8 0 pftag 88 2 0 1 1 0 1 1 0 8 0 pfstitem 24 296 0 140 2 0 2 2 0 8 0 pfstkey 128 296 0 140 6 0 6 6 0 8 0 pfstate 376 296 0 140 18 0 18 18 0 8 0 pfrule 1344 33 0 24 2 1 1 2 0 8 0 art_heap8 4096 5 0 1 4 0 4 4 0 8 0 art_heap4 256 1356 0 1022 34 10 24 29 0 8 0 art_table 32 1361 0 1023 4 0 4 4 0 8 0 art_node 16 377 0 312 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 8 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 38 0 16 1 0 1 1 0 8 0 shmpl 112 138 0 10 4 0 4 4 0 8 0 dirhash 1024 83 0 66 3 0 3 3 0 8 0 dino2pl 256 9695 0 8168 96 0 96 96 0 8 0 ffsino 280 9695 0 8168 111 1 110 110 0 8 0 nchpl 144 16459 0 15909 65 40 25 64 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 62361 0 62360 2 1 1 1 0 8 0 percpumem 16 114 0 66 1 0 1 1 0 8 0 kstatmem 264 160 0 132 6 3 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 19 0 19 6 5 1 1 0 8 1 scxspl 216 48816 0 48816 13 12 1 8 1 8 1 plimitpl 152 887 0 869 1 0 1 1 0 8 0 sigapl 424 5111 0 5040 10 1 9 9 0 8 0 futexpl 64 82211 0 82204 1 0 1 1 0 8 0 knotepl 120 865 0 0 25 0 25 25 0 8 0 kqueuepl 216 1418 0 1408 16 13 3 5 0 8 2 pipepl 328 790 0 763 12 9 3 8 0 8 0 fdescpl 504 5066 0 5034 6 1 5 6 0 8 0 filepl 152 37459 0 37229 35 23 12 18 0 8 1 lockfpl 104 2402 0 2399 7 6 1 4 0 8 0 lockfspl 48 697 0 694 1 0 1 1 0 8 0 sessionpl 144 37 0 29 1 0 1 1 0 8 0 pgrppl 48 92 0 76 1 0 1 1 0 8 0 ucredpl 104 6959 0 6944 1 0 1 1 0 8 0 zombiepl 144 5041 0 5040 1 0 1 1 0 8 0 processpl 1168 5111 0 5040 7 1 6 6 0 8 0 procpl 648 12468 0 12390 8 0 8 8 0 8 0 srpgc 96 20 0 20 7 7 0 1 0 8 0 sosppl 168 48 0 48 5 5 0 1 0 8 0 sockpl 688 10280 0 10243 56 45 11 22 0 8 7 mcl64k 65536 7 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 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 37 0 0 5 0 5 5 0 8 0 mtagpl 96 174 0 0 5 0 5 5 0 8 0 mbufpl 256 535 0 0 31 0 31 31 0 8 0 bufpl 280 13041 0 6875 441 0 441 441 0 8 0 anonpl 24 559419 0 545655 134 26 108 115 0 185 4 amapchunkpl 152 149378 0 148709 54 22 32 34 0 158 5 amappl16 200 11413 0 10893 69 28 41 44 0 8 2 amappl15 192 42 0 41 1 0 1 1 0 8 0 amappl14 184 138 0 127 1 0 1 1 0 8 0 amappl13 176 6 0 6 2 2 0 1 0 8 0 amappl12 168 5839 0 5808 4 2 2 3 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 243 0 242 2 1 1 1 0 8 0 amappl8 136 33 0 29 1 0 1 1 0 8 0 amappl7 128 130 0 118 1 0 1 1 0 8 0 amappl6 120 263 0 259 1 0 1 1 0 8 0 amappl5 112 157 0 146 1 0 1 1 0 8 0 amappl4 104 373 0 354 1 0 1 1 0 8 0 amappl3 96 32146 0 32028 5 1 4 4 0 8 0 amappl2 88 832 0 769 2 0 2 2 0 8 0 amappl1 80 23217 0 22671 16 2 14 14 0 8 0 amappl 88 45142 0 44956 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 3 0 2 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 257 0 257 4 3 1 1 0 8 1 dma64 64 8 0 8 3 3 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 21 0 20 1 0 1 1 0 8 0 aobjpl 72 140 0 10 3 0 3 3 0 8 0 uaddrrnd 24 5066 0 5034 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5066 0 5034 1 0 1 1 0 8 0 vmmpekpl 168 35404 0 35346 3 0 3 3 0 8 0 vmmpepl 168 304985 0 302601 140 18 122 122 0 357 2 vmsppl 456 5065 0 5034 8 3 5 5 0 8 0 rwobjpl 64 76299 0 68842 129 3 126 127 0 8 0 pdppl 4096 10139 0 10068 133 60 73 87 0 8 2 pvpl 32 27911 0 0 227 2 225 225 0 265 0 pmappl 248 5065 0 5034 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 381 0 108 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(ffffffff834ccff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff8360d908) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8360d908) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffffffff834ccff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -9 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:437 witness_checkorder(fffffd806a981858,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806a981840,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806a981840,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd806e7d2d80,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806e7d2d80,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c5cc528) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff80003c5cc528) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff80000128e2c0,fffffd807a80be00,ffff80002a44ecc8) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff80000128e2c0,fffffd807a80a900,fffffd807a80be00,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff80000128e2c0,fffffd807a80be00,ffff80003c5cc7a8,0,0,0) at sosend+0x804 sendit(ffff80002a44ecc8,3,ffff80003c5cc920,0,ffff80003c5cc9e0) at sendit+0x721 sys/kern/uipc_syscalls.c:779 sys_sendmsg(ffff80002a44ecc8,ffff80003c5cca90,ffff80003c5cc9e0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:597 syscall(ffff80003c5cca90) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5cca90) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8abf9cd6530, count: -15