login: witness: lock order reversal: 1st 0xffff800010fd4650 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd806965e848 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{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(fffffd806965e848,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806965e830,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806965e830,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8068e917e8,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8068e917e8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd8068e917e8,fffffd8068e91998,0,0,200,0,5dd0a01baebed554) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd8068e917e8,fffffd8068e91998,ffff80002a392020) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806cbbeb00,ec,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff800010fd4570,ffff80003c595508,ffff80003c5954b8,0,ffff80003c5954f8,ffff80003c59567c,6724f5d63645bebe) at soreceive+0xc73 sys/kern/uipc_socket.c:1021 recvit(ffff80002a392020,5,ffff80003c595650,0,ffff80003c595700) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff80002a392020,ffff80003c5957b0,ffff80003c595700) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80003c5957b0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5957b0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf66633a19f0, count: -14 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c594f90 rbx 0xfffffd800470d1b8 rdx 0xffff800001436d40 rcx 0xffff80002a392020 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c594e70 r9 0x8080808080808080 r10 0x5f78ba1f1607dd03 r11 0xa74083dd550ef273 r12 0 r13 0xfffffd8003f24f00 r14 0x3 r15 0xffffffff rip 0xffffffff810240e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c594f80 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=179280 pid=25158 tcnt=4 stat=onproc flags process=1000000 proc=4000000 runpri=24, usrpri=83, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a3934a0,0xffff80002a392d00 process=0xffff80003c54dbb8 user=0xffff80003c590000, vmspace=0xfffffd805f9b5910 estcpu=33, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 44377 151463 99334 0 2 0 syz-executor 44377 463023 99334 0 3 0x4000080 fsleep syz-executor 10761 253286 16192 0 2 0 syz-executor 10761 262738 16192 0 3 0x4000080 fsleep syz-executor 10761 372452 16192 0 2 0x4000000 syz-executor 37406 279452 11773 0 2 0 syz-executor 37406 70336 11773 0 3 0x4000080 fsleep syz-executor 32395 489685 30079 0 2 0 syz-executor 32395 25146 30079 0 7 0x4000000 syz-executor 25733 399411 20271 0 2 0 syz-executor 25733 215079 20271 0 3 0x4000080 ttyout syz-executor 25158 367321 48280 0 2 0x1000000 syz-executor *25158 179280 48280 0 7 0x5000000 syz-executor 25158 513051 48280 0 3 0x5000080 sbwait syz-executor 25158 311692 48280 0 3 0x5000080 fsleep syz-executor 52470 275089 45423 0 3 0x80 nanoslp syz-executor 52470 522196 45423 0 3 0x4000080 kqsel syz-executor 52470 186725 45423 0 3 0x4000080 fsleep syz-executor 16557 444267 1 0 3 0x100083 ttyin getty 56569 365592 96452 0 3 0x82 sbwait sshd-session 73571 49888 0 0 3 0x14200 bored sosplice 15964 34098 0 0 3 0x14280 nfsidl nfsio 10581 252466 0 0 3 0x14280 nfsidl nfsio 35502 385350 0 0 3 0x14280 nfsidl nfsio 61686 80346 0 0 3 0x14280 nfsidl nfsio 87742 109075 0 0 3 0x14280 nfsidl nfsio 87587 205062 0 0 3 0x14280 nfsidl nfsio 84080 479130 0 0 3 0x14280 nfsidl nfsio 14238 65798 0 0 3 0x14280 nfsidl nfsio 28478 247277 0 0 3 0x14280 nfsidl nfsio 67190 346775 0 0 3 0x14280 nfsidl nfsio 50887 200096 0 0 3 0x14280 nfsidl nfsio 1848 90490 0 0 3 0x14280 nfsidl nfsio 93235 273391 0 0 3 0x14280 nfsidl nfsio 31454 373662 0 0 3 0x14280 nfsidl nfsio 16134 470014 0 0 3 0x14280 nfsidl nfsio 53166 463358 0 0 3 0x14280 nfsidl nfsio 5365 398496 0 0 3 0x14280 nfsidl nfsio 8633 258564 0 0 3 0x14280 nfsidl nfsio 43436 184349 0 0 3 0x14280 nfsidl nfsio 104 346501 0 0 3 0x14280 nfsidl nfsio 30079 55643 17783 0 3 0x82 nanoslp syz-executor 61434 226588 17783 0 3 0x82 wait syz-executor 20271 492113 17783 0 3 0x82 nanoslp syz-executor 99334 104698 17783 0 3 0x82 nanoslp syz-executor 48280 356133 17783 0 3 0x82 nanoslp syz-executor 45423 519766 17783 0 3 0x82 nanoslp syz-executor 16192 80427 17783 0 3 0x82 nanoslp syz-executor 11773 249776 17783 0 3 0x82 nanoslp syz-executor 17783 186365 73933 0 3 0x82 kqread syz-executor 73933 306422 55985 0 3 0x10008a sigsusp ksh 55985 360904 1768 0 3 0x98 kqread sshd-session 1768 470521 96452 0 3 0x92 kqread sshd-session 96452 172914 1 0 3 0x88 kqread sshd 81564 377416 82936 74 3 0x1100092 bpf pflogd 82936 32405 1 0 3 0x80 sbwait pflogd 64806 169278 43434 73 3 0x1100090 kqread syslogd 43434 44703 1 0 3 0x100082 sbwait syslogd 35583 365776 1 0 3 0x100080 kqread resolvd 50669 362154 17542 77 3 0x100092 kqread dhcpleased 7410 68104 17542 77 3 0x100092 kqread dhcpleased 17542 218821 1 0 3 0x80 kqread dhcpleased 6649 305373 0 0 3 0x14200 bored smr 21821 438701 0 0 2 0x14200 zerothread 31920 318411 0 0 3 0x14200 aiodoned aiodoned 3858 327400 0 0 3 0x14200 syncer update 46413 288940 0 0 3 0x14200 cleaner cleaner 42471 139792 0 0 3 0x14200 reaper reaper 34353 34512 0 0 3 0x14200 pgdaemon pagedaemon 47005 233725 0 0 3 0x14200 bored viomb 22889 244769 0 0 3 0x40014200 acpi0 acpi0 68966 54642 0 0 3 0x40014200 idle1 54277 342399 0 0 3 0x14200 bored softnet3 55832 153353 0 0 3 0x14200 bored softnet2 80617 240882 0 0 3 0x14200 bored softnet1 54235 52704 0 0 2 0x14200 softnet0 19080 374476 0 0 3 0x14200 bored systqmp 18017 36916 0 0 3 0x14200 bored systq 52602 86165 0 0 3 0x14200 tmoslp softclockmp 95457 370327 0 0 3 0x40014200 tmoslp softclock 54450 98530 0 0 3 0x40014200 idle0 1 10000 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 25158 (syz-executor) thread 0xffff80002a392020 (179280) 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 (0xffff800010fd4650) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10203 11095K 11475K 166960K 12395 0 pcb 18 16K 18K 166960K 405 0 rtable 232 9K 9K 166960K 517 0 pf 40 18K 25K 166960K 113 0 ifaddr 42 7K 8K 166960K 77 0 ifgroup 59 2K 2K 166960K 131 0 sysctl 3 1K 1K 166960K 3 0 counters 66 36K 37K 166960K 126 0 ioctlops 0 0K 4K 166960K 1559 0 iov 1 0K 16K 166960K 105 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 85K 166960K 2012 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 42 0 dirhash 15 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 106K 166960K 919 0 sigio 0 0K 0K 166960K 21 0 proc 73 91K 128K 166960K 599 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 126 0 in_multi 88 6K 7K 166960K 131 0 ether_multi 1 0K 0K 166960K 7 0 mrt 2 0K 0K 166960K 4 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 586 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 249 74K 77K 166960K 10183 0 UVM aobj 82 3K 5K 166960K 87 0 pinsyscall 45 90K 100K 166960K 2043 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 46 0 NDP 13 0K 2K 166960K 50 0 temp 62 8643K 8714K 166960K 22240 0 kqueue 14 22K 28K 166960K 141 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 94 0 90 1 0 1 1 0 8 0 rtentry 112 133 0 33 4 0 4 4 0 8 0 unpcb 144 659 0 637 5 3 2 4 0 8 1 syncache 336 12 0 12 3 2 1 1 0 8 1 tcpqe 32 2 0 2 2 1 1 1 0 8 1 tcpcb 808 298 0 289 12 4 8 8 0 8 7 arp 120 21 0 3 1 0 1 1 0 8 0 inpcb 376 1480 0 1464 33 25 8 22 0 8 6 nd6 136 29 0 5 1 0 1 1 0 8 0 pkpcb 40 5 0 5 3 3 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 20 0 20 2 1 1 1 0 8 1 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 3 0 2 1 0 1 1 0 8 0 pfosfp 40 1428 0 1428 5 5 0 5 0 8 0 pfosfpen 112 1428 0 1428 21 21 0 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 63 0 18 1 0 1 1 0 8 0 pfstkey 128 63 0 18 2 0 2 2 0 8 0 pfstate 376 63 0 18 5 0 5 5 0 8 0 pfrule 1344 28 0 21 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 572 0 165 31 3 28 31 0 8 0 art_table 32 575 0 165 4 0 4 4 0 8 0 art_node 16 131 0 42 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 6 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 39 0 29 1 0 1 1 0 8 0 shmpl 112 84 0 5 3 0 3 3 0 8 0 dirhash 1024 23 0 4 3 0 3 3 0 8 0 dino2pl 256 3063 0 1560 95 0 95 95 0 8 0 ffsino 280 3063 0 1560 109 0 109 109 0 8 0 nchpl 144 4385 0 2693 63 0 63 63 0 8 0 rtmask 32 6 0 6 2 2 0 1 0 8 0 uvmvnodes 80 3490 0 0 72 0 72 72 0 8 0 vnodes 216 3490 0 0 194 0 194 194 0 8 0 namei 1024 14581 0 14581 2 0 2 2 0 8 2 percpumem 16 77 0 30 1 0 1 1 0 8 0 kstatmem 264 66 0 40 4 1 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 13003 0 13003 12 9 3 8 1 8 3 plimitpl 152 166 0 147 1 0 1 1 0 8 0 sigapl 424 1244 0 1172 9 0 9 9 0 8 0 futexpl 64 12435 0 12430 1 0 1 1 0 8 0 knotepl 120 318 0 0 10 0 10 10 0 8 0 kqueuepl 216 383 0 373 6 5 1 4 0 8 0 pipepl 328 245 0 217 3 0 3 3 0 8 0 fdescpl 504 1203 0 1170 5 0 5 5 0 8 0 filepl 152 8012 0 7780 27 12 15 19 0 8 5 lockfpl 104 387 0 384 1 0 1 1 0 8 0 lockfspl 48 117 0 114 1 0 1 1 0 8 0 sessionpl 144 33 0 23 1 0 1 1 0 8 0 pgrppl 48 48 0 30 1 0 1 1 0 8 0 ucredpl 104 1194 0 1181 1 0 1 1 0 8 0 zombiepl 144 1308 0 1307 2 1 1 1 0 8 0 processpl 1176 1244 0 1172 6 0 6 6 0 8 0 procpl 656 2574 0 2491 8 0 8 8 0 8 0 srpgc 96 4 0 4 1 1 0 1 0 8 0 sockpl 688 2256 0 2215 34 24 10 22 0 8 6 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 110 0 0 14 0 14 14 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 101 0 0 3 0 3 3 0 8 0 mbufpl 256 317 0 0 19 0 19 19 0 8 0 bufpl 280 3832 0 136 264 0 264 264 0 8 0 anonpl 24 187222 0 182578 58 27 31 49 0 184 0 amapchunkpl 152 32544 0 31953 29 4 25 25 0 158 0 amappl16 200 3970 0 3929 36 29 7 16 0 8 4 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 137 0 124 1 0 1 1 0 8 0 amappl13 176 2 0 2 1 1 0 1 0 8 0 amappl12 168 1855 0 1822 3 1 2 2 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 5 0 5 2 2 0 1 0 8 0 amappl9 144 263 0 263 1 1 0 1 0 8 0 amappl8 136 33 0 30 1 0 1 1 0 8 0 amappl7 128 118 0 104 1 0 1 1 0 8 0 amappl6 120 189 0 184 1 0 1 1 0 8 0 amappl5 112 129 0 119 1 0 1 1 0 8 0 amappl4 104 348 0 327 1 0 1 1 0 8 0 amappl3 96 6516 0 6392 4 0 4 4 0 8 0 amappl2 88 728 0 659 2 0 2 2 0 8 0 amappl1 80 12386 0 11720 17 1 16 16 0 8 0 amappl 88 9709 0 9521 5 0 5 5 0 92 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 3 0 3 2 1 1 1 0 8 1 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 86 0 5 2 0 2 2 0 8 0 uaddrrnd 24 1203 0 1170 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1203 0 1170 1 0 1 1 0 8 0 vmmpekpl 168 12369 0 12334 4 1 3 3 0 8 0 vmmpepl 168 81364 0 79281 111 12 99 107 0 357 3 vmsppl 456 1202 0 1170 6 1 5 5 0 8 0 rwobjpl 64 28190 0 23549 78 3 75 75 0 8 0 pdppl 4096 2413 0 2340 113 40 73 85 0 8 0 pvpl 32 16612 0 0 134 0 134 134 0 265 0 pmappl 248 1202 0 1170 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 314 0 53 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(ffffffff8383aff0) 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+0x199 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839068f0) at __mp_lock+0x199 sys/kern/kern_lock.c:144 intr_handler(ffff8000358adbb0,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __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(ffffffff839068f0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839068f0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x9f sys/dev/kcov.c:158 __mp_lock(ffffffff839068f0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839068f0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 vn_ioctl(fffffd8069130d30,8020426c,ffff8000358adf30,ffff80003c58f4b8) at vn_ioctl+0x4d sys/kern/vfs_vnops.c:514 sys_ioctl(ffff80003c58f4b8,ffff8000358ae110,ffff8000358ae060) at sys_ioctl+0x5c3 syscall(ffff8000358ae110) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000358ae110) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdf766773430, 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(fffffd806965e848,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806965e830,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806965e830,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8068e917e8,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8068e917e8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd8068e917e8,fffffd8068e91998,0,0,200,0,5dd0a01baebed554) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd8068e917e8,fffffd8068e91998,ffff80002a392020) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806cbbeb00,ec,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff800010fd4570,ffff80003c595508,ffff80003c5954b8,0,ffff80003c5954f8,ffff80003c59567c,6724f5d63645bebe) at soreceive+0xc73 sys/kern/uipc_socket.c:1021 recvit(ffff80002a392020,5,ffff80003c595650,0,ffff80003c595700) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff80002a392020,ffff80003c5957b0,ffff80003c595700) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80003c5957b0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5957b0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf66633a19f0, count: -14