login: witness: lock order reversal: 1st 0xffff800001433590 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd806c9c67d0 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83336438 -> 0xffffffff8337d414 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:878 #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: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:765 #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(fffffd806c9c67d0,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806c9c67b8,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806c9c67b8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd800d2602a0,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd800d2602a0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd800d2602a0,fffffd800d2602a0,0,0,200,0,b50350012a1f4459) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd800d2602a0,fffffd800d2602a0,ffff80002a2914d8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806c856400,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff8000014334a0,ffff80003c41c858,ffff80003c41c808,0,ffff80003c41c840,ffff80003c41c9cc,7b57bc997258b99b) at soreceive+0xc24 sys/kern/uipc_socket.c:1017 recvit(ffff80002a2914d8,4,ffff80003c41c9a0,0,ffff80003c41ca50) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff80002a2914d8,ffff80003c41cb00,ffff80003c41ca50) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff80003c41cb00) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c41cb00) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf29cacd0410, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c41c2f0 rbx 0 rdx 0xffff80000148a740 rcx 0xffff80002a2914d8 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c41c1d0 r9 0x8080808080808080 r10 0x423511f8b88138cc r11 0x7ffd73d18cd333fc r12 0xfffffd8003f41880 r13 0xfffffd80047293d8 r14 0x3 r15 0xffffffff83415eef substchar+0x8ebc rip 0xffffffff81a14155 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c41c2e0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=35624 pid=16334 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=0xffff80002a290a78,0xffffffff8393dee8 process=0xffff80003c484028 user=0xffff80003c417000, vmspace=0xfffffd806d9de030 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 16334 173866 86787 0 3 0x1000080 fsleep syz-executor *16334 35624 86787 0 7 0x5000000 syz-executor 34347 435061 29534 0 3 0x80 fsleep syz-executor 34347 162368 29534 0 3 0x4000080 ttyin syz-executor 16547 354326 59794 0 3 0x80 fsleep syz-executor 16547 438972 59794 0 3 0x4000080 ttyout syz-executor 25426 144258 0 0 3 0x14200 acct acct 66085 498590 28872 0 3 0x80 fsleep syz-executor 66085 262251 28872 0 3 0x4000080 sbwait syz-executor 56174 44032 55657 0 3 0x80 fsleep syz-executor 56174 283503 55657 0 3 0x4000080 ttyout syz-executor 85809 298240 90175 0 3 0x80 fsleep syz-executor 85809 496832 90175 0 3 0x4000080 ttyout syz-executor 21740 269936 1 0 3 0x100083 ttyin getty 11053 321105 32616 0 3 0x80 fsleep syz-executor 11053 168214 32616 0 3 0x4000080 ttyout syz-executor 28872 158931 71023 0 3 0x82 nanoslp syz-executor 47836 299102 0 0 3 0x14280 nfsidl nfsio 75891 364440 0 0 3 0x14280 nfsidl nfsio 45495 202508 0 0 3 0x14280 nfsidl nfsio 46734 36548 0 0 3 0x14280 nfsidl nfsio 74342 225431 0 0 3 0x14280 nfsidl nfsio 97357 436255 0 0 3 0x14280 nfsidl nfsio 1571 516625 0 0 3 0x14280 nfsidl nfsio 59342 338037 0 0 3 0x14280 nfsidl nfsio 86753 477531 0 0 3 0x14280 nfsidl nfsio 81177 266629 0 0 3 0x14280 nfsidl nfsio 89489 112465 0 0 3 0x14280 nfsidl nfsio 63935 405540 0 0 3 0x14280 nfsidl nfsio 6427 92505 0 0 3 0x14280 nfsidl nfsio 3911 100575 0 0 3 0x14280 nfsidl nfsio 88924 157970 0 0 3 0x14280 nfsidl nfsio 93264 6836 0 0 3 0x14280 nfsidl nfsio 28760 384978 0 0 3 0x14280 nfsidl nfsio 43193 510800 0 0 3 0x14280 nfsidl nfsio 98103 272641 0 0 3 0x14280 nfsidl nfsio 5680 236359 0 0 3 0x14280 nfsidl nfsio 86787 362337 71023 0 3 0x82 nanoslp syz-executor 59794 520852 71023 0 3 0x82 nanoslp syz-executor 29534 39932 71023 0 3 0x82 nanoslp syz-executor 90175 17921 71023 0 3 0x82 nanoslp syz-executor 55657 42278 71023 0 3 0x82 nanoslp syz-executor 32616 404069 71023 0 3 0x82 nanoslp syz-executor 3332 185855 71023 0 3 0x82 wait syz-executor 71023 493017 70016 0 3 0x82 kqread syz-executor 70016 147168 40177 0 3 0x10008a sigsusp ksh 40177 228577 25653 0 3 0x98 kqread sshd-session 25653 362757 45658 0 3 0x92 kqread sshd-session 45658 79942 1 0 3 0x88 kqread sshd 2851 434261 40612 74 3 0x1100092 bpf pflogd 40612 496657 1 0 3 0x80 sbwait pflogd 86468 346038 44719 73 3 0x1100090 kqread syslogd 44719 443382 1 0 3 0x100082 sbwait syslogd 29980 189070 1 0 3 0x100080 kqread resolvd 38398 146509 33040 77 3 0x100092 kqread dhcpleased 71885 359343 33040 77 3 0x100092 kqread dhcpleased 33040 314415 1 0 3 0x80 kqread dhcpleased 32879 433557 0 0 3 0x14200 bored smr 37235 207147 0 0 3 0x14200 pgzero zerothread 71480 413660 0 0 3 0x14200 aiodoned aiodoned 74066 403599 0 0 3 0x14200 syncer update 35202 397189 0 0 3 0x14200 cleaner cleaner 77153 8603 0 0 3 0x14200 reaper reaper 9402 307588 0 0 3 0x14200 pgdaemon pagedaemon 60768 304694 0 0 3 0x14200 bored viomb 44796 244394 0 0 3 0x40014200 acpi0 acpi0 33603 431788 0 0 7 0x40014200 idle1 41221 258 0 0 3 0x14200 bored softnet1 61136 395921 0 0 3 0x14200 bored softnet0 78293 436878 0 0 3 0x14200 bored systqmp 12313 507240 0 0 3 0x14200 bored systq 76058 239576 0 0 3 0x14200 tmoslp softclockmp 29642 266559 0 0 3 0x40014200 tmoslp softclock 60052 403299 0 0 3 0x40014200 idle0 1 128727 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 16334 (syz-executor) thread 0xffff80002a2914d8 (35624) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839b60b0) #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:1017 #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:765 #6 Xsyscall+0x128 exclusive rwlock sbufrcv r = 0 (0xffff800001433590) #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:878 #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:765 #7 Xsyscall+0x128 Process 66085 (syz-executor) thread 0xffff80003c4a0fc0 (262251) exclusive rwlock sbufrcv r = 0 (0xffff800010fdccd0) #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:878 #4 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #5 sys_recvmmsg+0x410 sys/kern/uipc_syscalls.c:969 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10218 11095K 11570K 166960K 13276 0 pcb 18 12K 12K 166960K 222 0 rtable 211 9K 9K 166960K 581 0 pf 39 18K 25K 166960K 211 0 ifaddr 37 6K 8K 166960K 125 0 ifgroup 55 2K 2K 166960K 246 0 sysctl 3 1K 9K 166960K 10 0 counters 68 36K 37K 166960K 230 0 ioctlops 0 0K 4K 166960K 1694 0 iov 2 16K 24K 166960K 50 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1316 83K 84K 166960K 2501 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 16 3K 3K 166960K 34 0 dirhash 12 2K 2K 166960K 48 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 3291 0 sigio 0 0K 0K 166960K 31 0 proc 72 115K 180K 166960K 670 0 subproc 72 4K 4K 166960K 82 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 162 0 in_multi 77 5K 7K 166960K 201 0 ether_multi 1 0K 0K 166960K 27 0 mrt 1 0K 0K 166960K 21 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 461 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 249 168K 182K 166960K 26769 0 UVM aobj 13 14K 14K 166960K 14 0 pinsyscall 43 86K 101K 166960K 4439 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 69 0 NDP 12 0K 2K 166960K 87 0 temp 59 8675K 8754K 166960K 69984 0 kqueue 13 20K 27K 166960K 239 0 SYN cache 2 16K 16K 166960K 2 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 120 130 0 127 1 0 1 1 0 8 0 rtentry 176 163 0 78 6 0 6 6 0 8 0 unpcb 144 495 0 474 2 1 1 2 0 8 0 syncache 336 10 0 10 3 2 1 1 0 8 1 tcpcb 736 276 0 271 1 0 1 1 0 8 0 arp 136 26 0 12 1 0 1 1 0 8 0 inpcb 328 878 0 868 3 1 2 2 0 8 1 nd6 152 28 0 9 1 0 1 1 0 8 0 pkpcb 40 10 0 10 3 3 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 2 0 2 1 0 1 1 0 8 1 ppxss 1192 53 0 53 2 1 1 1 0 8 1 pppxif 1504 11 0 11 1 0 1 1 0 8 1 pfstscr 40 3 0 2 2 1 1 1 0 8 0 pffrag 232 15 0 8 1 0 1 1 0 482 0 pffrnode 88 14 0 7 1 0 1 1 0 8 0 pffrent 40 24 0 17 1 0 1 1 0 8 0 pfosfp 40 1429 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1429 0 714 21 0 21 21 0 8 0 pfrktable 1344 2 0 2 1 1 0 1 0 8 0 pfanchor 1288 4 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 54 0 30 1 0 1 1 0 8 0 pfstkey 128 58 0 34 2 0 2 2 0 8 0 pfstate 448 54 0 32 5 0 5 5 0 8 0 pfrule 1344 28 0 22 2 1 1 2 0 8 0 rttmr 136 3 0 3 3 2 1 1 0 8 1 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 669 0 300 31 6 25 31 0 8 0 art_table 40 673 0 300 5 0 5 5 0 8 0 art_node 32 162 0 85 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 3 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 27 0 13 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 41 0 24 3 0 3 3 0 8 0 dino2pl 256 5926 0 4434 95 0 95 95 0 8 0 ffsino 296 5926 0 4434 117 0 117 117 0 8 0 nchpl 144 9509 0 7809 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 23527 0 23527 4 3 1 2 0 8 1 percpumem 16 130 0 81 1 0 1 1 0 8 0 vcpupl 3968 6 0 0 1 0 1 1 0 8 0 vmpool 840 7 0 1 1 0 1 1 0 8 0 kstatmem 264 144 0 114 4 1 3 3 0 8 1 scsiplug 72 7 0 7 4 4 0 1 0 8 0 scxspl 216 60935 0 60935 13 12 1 8 1 8 1 plimitpl 152 193 0 171 1 0 1 1 0 8 0 sigapl 424 3595 0 3526 8 0 8 8 0 8 0 knotepl 120 539 0 0 17 0 17 17 0 8 0 kqueuepl 224 291 0 282 1 0 1 1 0 8 0 pipepl 344 169 0 142 4 1 3 3 0 8 0 fdescpl 528 3555 0 3523 3 0 3 3 0 8 0 filepl 160 8768 0 8536 11 1 10 10 0 8 0 lockfpl 104 481 0 477 1 0 1 1 0 8 0 lockfspl 48 218 0 214 1 0 1 1 0 8 0 sessionpl 144 29 0 20 1 0 1 1 0 8 0 pgrppl 48 42 0 25 1 0 1 1 0 8 0 ucredpl 104 1184 0 1171 1 0 1 1 0 8 0 zombiepl 144 3527 0 3526 2 1 1 1 0 8 0 processpl 1232 3595 0 3526 6 0 6 6 0 8 0 procpl 664 6712 0 6636 7 0 7 7 0 8 0 sockpl 752 1538 0 1504 6 1 5 5 0 8 1 mcl64k 65536 29 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 12 0 0 1 0 1 1 0 8 0 mcl8k 8192 25 0 0 3 0 3 3 0 8 0 mcl4k 4096 122 0 0 16 0 16 16 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 31 0 0 4 0 4 4 0 8 0 mtagpl 96 133 0 0 4 0 4 4 0 8 0 mbufpl 256 351 0 0 20 0 20 20 0 8 0 bufpl 280 24038 0 17901 439 0 439 439 0 8 0 anonpl 32 11516 0 0 93 0 93 93 0 246 0 amapchunkpl 152 94580 0 94087 43 18 25 29 0 158 4 amappl16 200 10400 0 10363 106 92 14 28 0 8 8 amappl15 192 6 0 5 1 0 1 1 0 8 0 amappl14 184 6 0 6 1 1 0 1 0 8 0 amappl13 176 453 0 452 2 1 1 1 0 8 0 amappl12 168 3956 0 3913 3 0 3 3 0 8 0 amappl11 160 5 0 5 2 2 0 1 0 8 0 amappl10 152 51 0 37 1 0 1 1 0 8 0 amappl9 144 268 0 268 2 2 0 1 0 8 0 amappl8 136 40 0 38 1 0 1 1 0 8 0 amappl7 128 81 0 80 1 0 1 1 0 8 0 amappl6 120 295 0 282 1 0 1 1 0 8 0 amappl5 112 75 0 65 1 0 1 1 0 8 0 amappl4 104 448 0 418 1 0 1 1 0 8 0 amappl3 96 17482 0 17386 4 1 3 3 0 8 0 amappl2 88 3698 0 3624 2 0 2 2 0 8 0 amappl1 80 22863 0 22256 18 3 15 15 0 8 1 amappl 88 25847 0 25677 4 0 4 4 0 92 0 uvmvnodes 80 143 0 0 3 0 3 3 0 8 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma32768 32768 1 0 1 1 0 1 1 0 8 1 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 8 0 8 2 2 0 1 0 8 0 dma128 128 255 0 255 3 3 0 1 0 8 0 dma64 64 7 0 7 2 2 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 13 0 1 1 0 1 1 0 8 0 uaddrrnd 24 3555 0 3523 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3555 0 3523 1 0 1 1 0 8 0 vmmpekpl 168 23231 0 23188 3 0 3 3 0 8 0 vmmpepl 168 212318 0 210344 126 19 107 107 0 357 10 vmsppl 488 3554 0 3523 7 2 5 5 0 8 0 rwobjpl 80 49532 0 48440 42 10 32 32 0 8 4 pdppl 4096 7132 0 7054 115 35 80 86 0 8 2 pvpl 32 20346 0 0 163 0 163 163 0 265 0 pmappl 256 3561 0 3524 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 322 0 52 8 0 8 8 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(fffffd806c9c67d0,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806c9c67b8,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806c9c67b8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd800d2602a0,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd800d2602a0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd800d2602a0,fffffd800d2602a0,0,0,200,0,b50350012a1f4459) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd800d2602a0,fffffd800d2602a0,ffff80002a2914d8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806c856400,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff8000014334a0,ffff80003c41c858,ffff80003c41c808,0,ffff80003c41c840,ffff80003c41c9cc,7b57bc997258b99b) at soreceive+0xc24 sys/kern/uipc_socket.c:1017 recvit(ffff80002a2914d8,4,ffff80003c41c9a0,0,ffff80003c41ca50) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff80002a2914d8,ffff80003c41cb00,ffff80003c41ca50) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff80003c41cb00) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c41cb00) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf29cacd0410, 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 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299edff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -5