witness: lock order reversal: 1st 0xffff8000012ee668 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd806af54dc0 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff831555d2 -> 0xffffffff830ce0dc 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:537 #2 soreceive+0x28e sys/kern/uipc_socket.c:879 #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:437 witness_checkorder(fffffd806af54dc0,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806af54da8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806af54da8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd805dfafcc0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805dfafcc0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805dfafcc0,fffffd805dfaf378,0,0,200,0,30958d45749d686c) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805dfafcc0,fffffd805dfaf378,ffff8000ffff82a8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd805dee7700,ec,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff8000012ee588,ffff80003c5ea168,ffff80003c5ea118,0,ffff80003c5ea158,ffff80003c5ea2dc,3eb4c8b338330fd3) at soreceive+0xc73 sys/kern/uipc_socket.c:1018 recvit(ffff8000ffff82a8,5,ffff80003c5ea2b0,0,ffff80003c5ea360) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff8000ffff82a8,ffff80003c5ea410,ffff80003c5ea360) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80003c5ea410) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5ea410) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2fcbf85acf0, count: -14 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c5e9bf0 rbx 0xfffffd8004342828 rdx 0xffff80000129d400 rcx 0xffff8000ffff82a8 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c5e9ad0 r9 0x8080808080808080 r10 0xf069ea12a4d64506 r11 0x94bccde8c95019d5 r12 0 r13 0xfffffd8003b5af00 r14 0x3 r15 0xffffffff rip 0xffffffff824c8055 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c5e9be0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=65929 pid=67981 tcnt=3 stat=onproc flags process=1000000 proc=4000000 runpri=24, usrpri=50, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff91d8,0xffff8000ffff9980 process=0xffff80002f15b920 user=0xffff80003c5e5000, vmspace=0xfffffd8063dceae0 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49407 3333 95070 0 7 0 syz-executor 49407 169548 95070 0 2 0x4000080 syz-executor 75144 390486 81449 0 2 0 syz-executor 75144 156574 81449 0 3 0x4000080 fsleep syz-executor 10070 269119 75895 0 2 0 syz-executor 10070 360672 75895 0 3 0x4000080 fsleep syz-executor 67981 105963 97372 0 2 0x1000000 syz-executor *67981 65929 97372 0 7 0x5000000 syz-executor 67981 285178 97372 0 2 0x5000000 syz-executor 92250 451285 8261 0 2 0 syz-executor 92250 287774 8261 0 3 0x4000080 fsleep syz-executor 90269 397863 11910 0 3 0x80 nanoslp syz-executor 90269 447400 11910 0 3 0x4000080 kqread syz-executor 90269 25342 11910 0 3 0x4000080 fsleep syz-executor 60016 417586 0 0 3 0x14200 acct acct 38725 415810 1 0 3 0x100083 ttyin getty 18775 173700 0 0 3 0x14200 bored sosplice 81449 406945 9949 0 3 0x82 nanoslp syz-executor 75895 91214 9949 0 3 0x82 nanoslp syz-executor 95070 265238 9949 0 3 0x82 nanoslp syz-executor 40700 428907 9949 0 3 0x82 wait syz-executor 97372 439719 9949 0 3 0x82 nanoslp syz-executor 11910 355364 9949 0 3 0x82 nanoslp syz-executor 8261 392947 9949 0 3 0x82 nanoslp syz-executor 40359 171603 9949 0 3 0x2 biowait syz-executor 9949 53893 36141 0 3 0x82 kqread syz-executor 36141 149226 61940 0 3 0x10008a sigsusp ksh 61940 190107 40398 0 3 0x98 kqread sshd-session 40398 214798 16221 0 3 0x92 kqread sshd-session 16221 495250 1 0 3 0x88 kqread sshd 48165 114471 31371 74 3 0x1100092 bpf pflogd 31371 279143 1 0 3 0x80 sbwait pflogd 63374 303525 22859 73 3 0x1100090 kqread syslogd 22859 142476 1 0 3 0x100082 sbwait syslogd 73848 168326 1 0 3 0x100080 kqread resolvd 20346 145273 52870 77 3 0x100092 kqread dhcpleased 89354 158481 52870 77 3 0x100092 kqread dhcpleased 52870 263209 1 0 3 0x80 kqread dhcpleased 82964 317622 0 0 3 0x14200 bored smr 63789 417061 0 0 2 0x14200 zerothread 50302 30827 0 0 3 0x14200 aiodoned aiodoned 40596 473412 0 0 3 0x14200 syncer update 57698 435739 0 0 3 0x14200 cleaner cleaner 59263 66978 0 0 3 0x14200 reaper reaper 64195 243041 0 0 3 0x14200 pgdaemon pagedaemon 5704 513218 0 0 3 0x14200 bored viomb 60568 482988 0 0 3 0x40014200 acpi0 acpi0 56687 481614 0 0 3 0x40014200 idle1 16194 195126 0 0 3 0x14200 bored softnet3 51940 50333 0 0 3 0x14200 bored softnet2 71084 332764 0 0 3 0x14200 bored softnet1 36243 58880 0 0 2 0x14200 softnet0 92246 365655 0 0 3 0x14200 bored systqmp 9166 387443 0 0 3 0x14200 bored systq 70305 185617 0 0 3 0x14200 tmoslp softclockmp 21431 238348 0 0 3 0x40014200 tmoslp softclock 56972 404151 0 0 3 0x40014200 idle0 1 470693 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 67981 (syz-executor) thread 0xffff8000ffff82a8 (65929) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff835c0060) #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:1018 #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 (0xffff8000012ee668) #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 soreceive+0x28e sys/kern/uipc_socket.c:879 #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 Process 40359 (syz-executor) thread 0xffff80002a44c528 (171603) exclusive rrwlock inode r = 0 (0xfffffd806de25870) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2bd sys/kern/vfs_subr.c:694 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1851 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8079cef530) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1851 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10198 11035K 11473K 166960K 13034 0 pcb 17 12K 12K 166960K 225 0 rtable 179 6K 9K 166960K 551 0 pf 32 17K 19K 166960K 126 0 ifaddr 33 5K 7K 166960K 98 0 ifgroup 50 2K 2K 166960K 152 0 sysctl 4 1K 1K 166960K 4 0 counters 60 35K 37K 166960K 130 0 ioctlops 0 0K 4K 166960K 1578 0 iov 0 0K 16K 166960K 50 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1326 83K 84K 166960K 2212 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 20 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 32 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 97K 166960K 3449 0 sigio 0 0K 0K 166960K 24 0 proc 73 91K 128K 166960K 685 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 169 0 in_multi 66 4K 7K 166960K 231 0 ether_multi 1 0K 0K 166960K 11 0 mrt 1 0K 0K 166960K 9 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 473 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 218 72K 77K 166960K 31088 0 UVM aobj 30 4K 4K 166960K 31 0 pinsyscall 42 84K 104K 166960K 4600 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 79 0 NDP 10 0K 2K 166960K 71 0 temp 61 6895K 7145K 166960K 43653 0 kqueue 14 22K 28K 166960K 223 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 120 106 0 103 1 0 1 1 0 8 0 rtentry 112 167 0 90 4 0 4 4 0 8 0 unpcb 144 547 0 524 2 1 1 2 0 8 0 syncache 336 16 0 16 4 3 1 1 0 8 1 tcpqe 32 3 0 3 1 1 0 1 0 8 0 tcpcb 808 296 0 288 2 0 2 2 0 8 0 arp 120 25 0 11 1 0 1 1 0 8 0 inpcb 376 1062 0 1050 5 2 3 3 0 8 1 nd6 136 42 0 21 2 1 1 2 0 8 0 pkpcb 40 8 0 8 3 3 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 24 0 24 3 2 1 1 0 8 1 pffrag 232 10 0 2 1 0 1 1 0 482 0 pffrnode 88 9 0 2 1 0 1 1 0 8 0 pffrent 40 22 0 14 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 pfstitem 24 124 0 41 1 0 1 1 0 8 0 pfstkey 128 124 0 41 3 0 3 3 0 8 0 pfstate 376 124 0 41 9 0 9 9 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 848 0 472 34 8 26 32 0 8 0 art_table 32 852 0 472 5 0 5 5 0 8 0 art_node 16 162 0 94 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 8 1 0 1 1 0 8 0 semupl 112 3 0 3 2 2 0 1 0 8 0 semapl 112 28 0 18 1 0 1 1 0 8 0 shmpl 112 28 0 1 1 0 1 1 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 5872 0 4364 95 0 95 95 0 8 0 ffsino 280 5872 0 4364 109 0 109 109 0 8 0 nchpl 144 9742 0 9207 63 39 24 63 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 24096 0 24096 8 7 1 2 0 8 1 percpumem 16 79 0 35 1 0 1 1 0 8 0 kstatmem 264 90 0 70 3 1 2 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 6 0 6 4 4 0 1 0 8 0 scxspl 216 29912 0 29911 10 9 1 7 1 8 0 plimitpl 152 156 0 139 1 0 1 1 0 8 0 sigapl 424 3785 0 3734 8 2 6 8 0 8 0 futexpl 64 14492 0 14488 1 0 1 1 0 8 0 knotepl 120 559 0 0 17 0 17 17 0 8 0 kqueuepl 216 249 0 239 1 0 1 1 0 8 0 pipepl 328 173 0 146 4 1 3 3 0 8 0 fdescpl 504 3744 0 3713 10 5 5 6 0 8 0 filepl 152 9070 0 8848 10 0 10 10 0 8 0 lockfpl 104 393 0 390 1 0 1 1 0 8 0 lockfspl 48 156 0 153 1 0 1 1 0 8 0 sessionpl 144 37 0 28 1 0 1 1 0 8 0 pgrppl 48 57 0 40 1 0 1 1 0 8 0 ucredpl 104 1211 0 1198 1 0 1 1 0 8 0 zombiepl 144 4047 0 4046 5 4 1 1 0 8 0 processpl 1168 3785 0 3734 6 2 4 6 0 8 0 procpl 648 7506 0 7447 7 1 6 7 0 8 0 srpgc 96 18 0 18 3 2 1 1 0 8 1 sosppl 168 20 0 20 1 0 1 1 0 8 1 sockpl 688 1728 0 1691 8 3 5 5 0 8 1 mcl64k 65536 19 0 0 3 0 3 3 0 8 0 mcl16k 16384 18 0 0 3 0 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 19 0 0 3 0 3 3 0 8 0 mcl4k 4096 107 0 0 14 0 14 14 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 59 0 0 2 0 2 2 0 8 0 mbufpl 256 291 0 0 17 0 17 17 0 8 0 bufpl 280 7405 0 1239 441 0 441 441 0 8 0 anonpl 24 361935 0 358564 44 20 24 36 0 185 0 amapchunkpl 152 100509 0 100049 33 12 21 23 0 158 2 amappl16 200 5233 0 5191 11 7 4 8 0 8 0 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 142 0 130 1 0 1 1 0 8 0 amappl13 176 2 0 2 1 1 0 1 0 8 0 amappl12 168 4398 0 4367 4 2 2 3 0 8 0 amappl11 160 54 0 39 1 0 1 1 0 8 0 amappl10 152 6 0 6 2 2 0 1 0 8 0 amappl9 144 247 0 247 2 2 0 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 119 0 107 1 0 1 1 0 8 0 amappl6 120 192 0 189 2 1 1 1 0 8 0 amappl5 112 128 0 117 1 0 1 1 0 8 0 amappl4 104 375 0 358 1 0 1 1 0 8 0 amappl3 96 22363 0 22255 5 1 4 4 0 8 0 amappl2 88 770 0 710 2 0 2 2 0 8 0 amappl1 80 21076 0 20501 16 2 14 14 0 8 0 amappl 88 30580 0 30418 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 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 7 0 7 2 2 0 1 0 8 0 dma128 128 255 0 255 3 3 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 30 0 1 1 0 1 1 0 8 0 uaddrrnd 24 3744 0 3713 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3744 0 3713 1 0 1 1 0 8 0 vmmpekpl 168 26371 0 26334 4 1 3 3 0 8 0 vmmpepl 168 215671 0 213799 113 23 90 95 0 357 4 vmsppl 456 3743 0 3713 7 2 5 5 0 8 1 rwobjpl 64 54331 0 47448 114 1 113 113 0 8 0 pdppl 4096 7495 0 7426 123 52 71 87 0 8 2 pvpl 32 13312 0 0 107 0 107 107 0 265 0 pmappl 248 3743 0 3713 4 1 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 343 0 86 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(ffffffff83484ff0) 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 __mp_lock(ffffffff835bfe58) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835bfe58) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80003757e700,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff835bfe58) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835bfe58) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80003757e860,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x734c669092c0, 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(fffffd806af54dc0,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806af54da8,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806af54da8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd805dfafcc0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805dfafcc0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805dfafcc0,fffffd805dfaf378,0,0,200,0,30958d45749d686c) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805dfafcc0,fffffd805dfaf378,ffff8000ffff82a8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd805dee7700,ec,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff8000012ee588,ffff80003c5ea168,ffff80003c5ea118,0,ffff80003c5ea158,ffff80003c5ea2dc,3eb4c8b338330fd3) at soreceive+0xc73 sys/kern/uipc_socket.c:1018 recvit(ffff8000ffff82a8,5,ffff80003c5ea2b0,0,ffff80003c5ea360) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff8000ffff82a8,ffff80003c5ea410,ffff80003c5ea360) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80003c5ea410) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5ea410) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2fcbf85acf0, count: -14