witness: lock order reversal: 1st 0xffff8000014c0110 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd806e6ca108 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff832f9abd -> 0xffffffff8334590b is missing lock order [2] inode (&ip->i_lock) -> [1] 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:870 #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+0xdfb 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:746 #12 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(fffffd806e6ca108,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806e6ca0f0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806e6ca0f0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8065bc8c18,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd8065bc8c18,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd8065bc8c18,fffffd805ded7200,0,0,200,0,bfb9d14a09bf9e35) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd8065bc8c18,fffffd805ded7200,ffff80003c423a18) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd8062841100,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff8000014c0020,ffff80003a801388,ffff80003a801338,0,ffff80003a801370,ffff80003a8014fc,bfe9e385ee88fc07) at soreceive+0xc24 sys/kern/uipc_socket.c:1009 recvit(ffff80003c423a18,7,ffff80003a8014d0,0,ffff80003a801580) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff80003c423a18,ffff80003a801630,ffff80003a801580) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff80003a801630) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a801630) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x374df20ddd0, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003a800e20 rbx 0 rdx 0xffff80000147ddc0 rcx 0xffff80003c423a18 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003a800d00 r9 0x8080808080808080 r10 0xc20053eb2aec747f r11 0x7b36c22afcb815f7 r12 0xfffffd8003eff640 r13 0xfffffd80046e74e8 r14 0x3 r15 0xffffffff833e2b64 substchar+0xf1da rip 0xffffffff831577a5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003a800e10 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=159303 pid=30374 tcnt=2 stat=onproc flags process=1000000 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c423250,0xffff80003c422d30 process=0xffff80002a27d838 user=0xffff80003a7fc000, vmspace=0xfffffd805dbd9028 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 43643 213294 99803 0 2 0 syz-executor 43643 475131 99803 0 2 0x4000000 syz-executor 52516 157958 4875 -1 2 0x10 syz-executor 52516 83187 4875 -1 3 0x4000090 kqpoll syz-executor 55841 347195 3395 0 2 0 syz-executor 55841 457179 3395 0 3 0x4000080 fsleep syz-executor 55841 315086 3395 0 3 0x4000080 fsleep syz-executor 55841 275793 3395 0 7 0x4000000 syz-executor 30374 35260 21650 0 2 0x1000000 syz-executor *30374 159303 21650 0 7 0x5000000 syz-executor 73166 381455 76070 0 2 0 syz-executor 73166 14658 76070 0 3 0x4000080 ttyout syz-executor 73166 378753 76070 0 3 0x4000080 fsleep syz-executor 73166 233553 76070 0 2 0x4000000 syz-executor 47489 251658 87994 0 3 0x3000 suspend syz-executor 47489 67676 87994 0 3 0x4081000 biowait syz-executor 53860 370456 0 0 3 0x14280 nfsidl nfsio 35511 110005 0 0 3 0x14280 nfsidl nfsio 4519 2417 0 0 3 0x14280 nfsidl nfsio 71912 343868 1 0 3 0x100083 ttyopn getty 30130 341496 0 0 3 0x14200 bored sosplice 99803 42493 65913 0 3 0x82 nanoslp syz-executor 76070 365152 65913 0 3 0x82 nanoslp syz-executor 21650 284747 65913 0 3 0x82 nanoslp syz-executor 87994 395211 65913 0 3 0x82 nanoslp syz-executor 75859 516115 65913 0 3 0x82 wait syz-executor 3395 199994 65913 0 3 0x82 nanoslp syz-executor 75490 378295 65913 0 3 0x2 biowait syz-executor 4875 333069 65913 0 3 0x82 nanoslp syz-executor 65913 504384 95452 0 2 0x2 syz-executor 95452 437903 72986 0 3 0x10008a sigsusp ksh 72986 246041 66386 0 3 0x98 kqread sshd-session 66386 129809 40894 0 3 0x92 kqread sshd-session 40894 484307 1 0 3 0x88 kqread sshd 90938 225038 62387 74 3 0x1100092 bpf pflogd 62387 51187 1 0 3 0x80 sbwait pflogd 66603 176094 46020 73 3 0x1100090 kqread syslogd 46020 67757 1 0 3 0x100082 sbwait syslogd 67274 288431 1 0 3 0x100080 kqread resolvd 42893 293276 16 77 3 0x100092 kqread dhcpleased 49468 109746 16 77 3 0x100092 kqread dhcpleased 16 108213 1 0 3 0x80 kqread dhcpleased 53877 251770 0 0 3 0x14200 bored smr 70772 57232 0 0 2 0x14200 zerothread 50053 425525 0 0 3 0x14200 aiodoned aiodoned 97991 169082 0 0 3 0x14200 syncer update 89110 408508 0 0 3 0x14200 cleaner cleaner 58479 112864 0 0 3 0x14200 reaper reaper 65774 126766 0 0 3 0x14200 pgdaemon pagedaemon 40664 365265 0 0 3 0x14200 bored viomb 38041 123691 0 0 3 0x40014200 acpi0 acpi0 45938 60076 0 0 3 0x40014200 idle1 81050 487582 0 0 3 0x14200 bored softnet1 18976 492918 0 0 3 0x14200 bored softnet0 79097 411659 0 0 3 0x14200 bored systqmp 94396 196640 0 0 3 0x14200 bored systq 58018 128583 0 0 3 0x14200 tmoslp softclockmp 46973 51671 0 0 3 0x40014200 tmoslp softclock 86176 163958 0 0 3 0x40014200 idle0 1 420427 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 30374 (syz-executor) thread 0xffff80003c423a18 (159303) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83915fc0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 unp_externalize+0x155 sys/kern/uipc_usrreq.c:-1 #2 soreceive+0xc24 sys/kern/uipc_socket.c:1009 #3 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #4 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #6 Xsyscall+0x128 exclusive rwlock sbufrcv r = 0 (0xffff8000014c0110) #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 soreceive+0x27d sys/kern/uipc_socket.c:870 #4 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #5 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #7 Xsyscall+0x128 Process 47489 (syz-executor) thread 0xffff8000fffeed10 (67676) exclusive rrwlock inode r = 0 (0xfffffd806d9ffa00) #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 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:746 #9 Xsyscall+0x128 Process 75490 (syz-executor) thread 0xffff80002a2722a8 (378295) exclusive rrwlock inode r = 0 (0xfffffd806bbe28f0) #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 vget+0x2a2 sys/kern/vfs_subr.c:693 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d2b1698) #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 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10241 11163K 11605K 166960K 13244 0 pcb 17 14K 16K 166960K 243 0 rtable 195 10K 10K 166960K 418 0 pf 35 17K 18K 166960K 106 0 ifaddr 37 6K 7K 166960K 84 0 ifgroup 55 2K 2K 166960K 132 0 sysctl 3 1K 9K 166960K 8 0 counters 68 36K 37K 166960K 154 0 ioctlops 0 0K 4K 166960K 1844 0 iov 0 0K 24K 166960K 71 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1484 93K 94K 166960K 2411 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 15 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 108 0 dirhash 12 2K 2K 166960K 33 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 1085 0 sigio 0 0K 0K 166960K 23 0 proc 73 115K 180K 166960K 652 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 108 0 in_multi 74 5K 7K 166960K 140 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 515 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 238 159K 170K 166960K 11808 0 UVM aobj 75 3K 3K 166960K 77 0 pinsyscall 42 84K 103K 166960K 2228 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 73 0 NDP 12 0K 1K 166960K 58 0 temp 77 8656K 8755K 166960K 51913 0 kqueue 13 20K 28K 166960K 211 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 120 142 0 139 2 1 1 2 0 8 0 rtentry 176 128 0 55 5 0 5 5 0 8 0 unpcb 144 491 0 472 2 1 1 2 0 8 0 syncache 336 7 0 7 3 2 1 1 0 8 1 tcpqe 32 4 0 4 2 1 1 1 0 8 1 tcpcb 736 409 0 400 10 7 3 7 0 8 1 arp 136 16 0 5 1 0 1 1 0 8 0 inpcb 328 1124 0 1112 12 5 7 7 0 8 5 nd6 152 21 0 6 1 0 1 1 0 8 0 pkpcb 40 8 0 8 2 1 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 34 0 34 2 1 1 1 0 8 1 pppxif 1504 3 0 3 2 2 0 1 0 8 0 pffrag 232 10 0 0 1 0 1 1 0 482 0 pffrnode 88 8 0 0 1 0 1 1 0 8 0 pffrent 40 17 0 4 1 0 1 1 0 8 0 pfosfp 40 1430 0 1006 5 0 5 5 0 8 0 pfosfpen 112 1430 0 715 21 0 21 21 0 8 0 pfrktable 1344 2 0 2 1 1 0 1 0 8 0 pfstitem 24 81 0 28 1 0 1 1 0 8 0 pfstkey 128 81 0 28 2 0 2 2 0 8 0 pfstate 384 80 0 28 6 0 6 6 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 4 0 1 4 1 3 4 0 8 0 art_heap4 256 556 0 234 30 5 25 28 0 8 1 art_table 40 560 0 235 5 0 5 5 0 8 0 art_node 32 128 0 65 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 103 0 93 1 0 1 1 0 8 0 shmpl 112 74 0 2 3 0 3 3 0 8 0 dirhash 1024 31 0 14 3 0 3 3 0 8 0 dino2pl 256 3385 0 1873 96 0 96 96 0 8 0 ffsino 296 3385 0 1873 118 0 118 118 0 8 0 nchpl 144 4897 0 3203 64 0 64 64 0 8 0 rtmask 32 5 0 5 2 1 1 1 0 8 1 uvmvnodes 80 4166 0 0 86 0 86 86 0 8 0 vnodes 216 4166 0 0 232 0 232 232 0 8 0 namei 1024 16646 0 16646 3 2 1 2 0 8 1 percpumem 16 92 0 43 1 0 1 1 0 8 0 kstatmem 264 82 0 54 3 0 3 3 0 8 1 scsiplug 72 6 0 6 1 1 0 1 0 8 0 scxspl 216 33861 0 33859 7 5 2 4 1 8 1 plimitpl 152 229 0 211 1 0 1 1 0 8 0 sigapl 424 1398 0 1347 8 1 7 7 0 8 0 knotepl 120 577 0 0 18 0 18 18 0 8 0 kqueuepl 224 348 0 338 2 1 1 2 0 8 0 pipepl 344 372 0 345 12 3 9 9 0 8 6 fdescpl 528 1374 0 1343 3 0 3 3 0 8 0 filepl 160 8706 0 8481 22 2 20 21 0 8 8 lockfpl 104 701 0 696 2 0 2 2 0 8 1 lockfspl 48 284 0 280 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 46 0 29 1 0 1 1 0 8 0 ucredpl 104 1340 0 1326 1 0 1 1 0 8 0 zombiepl 144 1349 0 1347 1 0 1 1 0 8 0 processpl 1232 1398 0 1347 6 1 5 5 0 8 0 procpl 664 3040 0 2979 7 1 6 7 0 8 0 sosppl 168 10 0 10 2 1 1 1 0 8 1 sockpl 752 1796 0 1762 16 6 10 11 0 8 6 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 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 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 37 0 0 5 0 5 5 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 1208 0 0 75 0 75 75 0 8 0 bufpl 280 15177 0 9034 439 0 439 439 0 8 0 anonpl 32 11313 0 0 92 0 92 92 0 246 0 amapchunkpl 152 51156 0 50666 44 9 35 41 0 158 12 amappl16 200 5587 0 5395 47 23 24 27 0 8 1 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 117 0 105 1 0 1 1 0 8 0 amappl13 176 26 0 25 1 0 1 1 0 8 0 amappl12 168 2046 0 2014 3 1 2 2 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 2 0 2 1 1 0 1 0 8 0 amappl9 144 259 0 258 1 0 1 1 0 8 0 amappl8 136 25 0 21 1 0 1 1 0 8 0 amappl7 128 113 0 100 1 0 1 1 0 8 0 amappl6 120 191 0 188 1 0 1 1 0 8 0 amappl5 112 134 0 125 1 0 1 1 0 8 0 amappl4 104 312 0 292 1 0 1 1 0 8 0 amappl3 96 6761 0 6664 4 1 3 3 0 8 0 amappl2 88 1622 0 1543 2 0 2 2 0 8 0 amappl1 80 12455 0 11851 15 0 15 15 0 8 0 amappl 88 10922 0 10755 5 0 5 5 0 92 0 dma4096 4096 2 0 2 2 2 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 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 76 0 2 2 0 2 2 0 8 0 uaddrrnd 24 1374 0 1343 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1374 0 1343 1 0 1 1 0 8 0 vmmpekpl 168 13154 0 13115 3 0 3 3 0 8 1 vmmpepl 168 91815 0 89650 112 3 109 110 0 357 1 vmsppl 488 1373 0 1343 6 1 5 5 0 8 0 rwobjpl 80 30701 0 25360 114 0 114 114 0 8 0 pdppl 4096 2756 0 2686 110 38 72 86 0 8 2 pvpl 32 19801 0 0 161 1 160 160 0 265 0 pmappl 256 1373 0 1343 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 365 0 59 9 0 9 9 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(fffffd806e6ca108,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806e6ca0f0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806e6ca0f0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8065bc8c18,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd8065bc8c18,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd8065bc8c18,fffffd805ded7200,0,0,200,0,bfb9d14a09bf9e35) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd8065bc8c18,fffffd805ded7200,ffff80003c423a18) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd8062841100,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff8000014c0020,ffff80003a801388,ffff80003a801338,0,ffff80003a801370,ffff80003a8014fc,bfe9e385ee88fc07) at soreceive+0xc24 sys/kern/uipc_socket.c:1009 recvit(ffff80003c423a18,7,ffff80003a8014d0,0,ffff80003a801580) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff80003c423a18,ffff80003a801630,ffff80003a801580) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff80003a801630) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a801630) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x374df20ddd0, count: -14 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(ffffffff83915db8) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83915db8) at __mp_lock+0x199 sys/kern/kern_lock.c:165 end trace frame: 0x0, count: -4