witness: lock order reversal: 1st 0xffff8000016d5028 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffff1806ee18590 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83445d4a -> 0xffffffff83494977 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:890 #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:537 #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:791 #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}> show kasan No such command ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(fffff1806ee18590,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffff1806ee18578,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffff1806ee18578,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffff180609fa628,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffff180609fa628,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576 vfs_getcwd_common(fffff180609fa628,fffff180609fa988,0,0,200,0,600846afc86b2fe1) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffff180609fa628,fffff180609fa988,ffff80003c4a42d0) at vn_isunder+0x56 sys/kern/vfs_vnops.c:700 unp_externalize(fffff1806d874400,f0,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff8000016d4f38,ffff800039f9d2a8,ffff800039f9d258,0,ffff800039f9d290,ffff800039f9d41c,6a5321d2363dd581) at soreceive+0xc24 sys/kern/uipc_socket.c:1029 recvit(ffff80003c4a42d0,6,ffff800039f9d3f0,0,ffff800039f9d4a0) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff80003c4a42d0,ffff800039f9d550,ffff800039f9d4a0) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff800039f9d550) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039f9d550) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3dffc981f90, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff800039f9cd30 rbx 0 rdx 0xffff8000015d7e80 rcx 0xffff80003c4a42d0 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff800039f9cc10 r9 0x8080808080808080 r10 0x50b917e98b4b31dd r11 0x3439b99fb858297c r12 0xfffff180040cd940 r13 0xfffff180048b5240 r14 0x3 r15 0xffffffff835305d4 substchar+0xacc9 rip 0xffffffff827fe5f5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800039f9cd20 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=199614 pid=88562 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=0xffff80003c4a4fc8,0xffff80003c4a5cd0 process=0xffff80003c3ed838 user=0xffff800039f98000, vmspace=0xfffff1806cce3208 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 40411 88402 67385 0 2 0 0 syz-executor 40411 319905 67385 0 3 0 0x4000080 piperd syz-executor 40411 97772 67385 0 3 0 0x4000080 fsleep syz-executor 22695 319627 91690 0 2 0 0 syz-executor 22695 22936 91690 0 3 0 0x4000080 fsleep syz-executor 4468 303607 82331 0 2 0 0 syz-executor 4468 180537 82331 0 3 0 0x4000080 fsleep syz-executor 88562 380211 44760 0 2 0x1000000 0 syz-executor *88562 199614 44760 0 7 0x1000000 0x4000000 syz-executor 88562 118200 44760 0 2 0x1000000 0x4000000 syz-executor 42589 287552 93803 0 3 0 0x80 nanoslp syz-executor 42589 59981 93803 0 3 0 0x4000080 kqsel syz-executor 42589 518005 93803 0 3 0 0x4000080 fsleep syz-executor 62803 120175 64286 0 3 0 0x80 nanoslp syz-executor 62803 498984 64286 0 3 0 0x4000080 ttyretype syz-executor 62803 115690 64286 0 3 0 0x4000080 fsleep syz-executor 74698 307157 2418 0 2 0 0 syz-executor 74698 174283 2418 0 3 0 0x4000080 fsleep syz-executor 74698 275013 2418 0 3 0 0x4000080 fsleep syz-executor 34466 236388 57544 60929 3 0x10 0x80 nanoslp syz-executor 34466 244614 57544 60929 3 0x10 0x4000080 netcon syz-executor 34466 408181 57544 60929 3 0x10 0x4000080 fsleep syz-executor 44277 513775 1 0 3 0x100003 0x80 ttyin getty 54841 379235 0 0 3 0x14000 0x280 nfsidl nfsio 27664 410943 0 0 3 0x14000 0x280 nfsidl nfsio 11951 288427 0 0 3 0x14000 0x280 nfsidl nfsio 16304 238166 0 0 3 0x14000 0x280 nfsidl nfsio 74922 453017 0 0 3 0x14000 0x280 nfsidl nfsio 21948 323531 0 0 3 0x14000 0x280 nfsidl nfsio 41679 240817 0 0 3 0x14000 0x280 nfsidl nfsio 53652 511804 0 0 3 0x14000 0x280 nfsidl nfsio 20411 455525 0 0 3 0x14000 0x280 nfsidl nfsio 61865 258348 0 0 3 0x14000 0x280 nfsidl nfsio 50883 360982 0 0 3 0x14000 0x280 nfsidl nfsio 4283 393306 0 0 3 0x14000 0x280 nfsidl nfsio 78292 34368 0 0 3 0x14000 0x280 nfsidl nfsio 98440 59299 0 0 3 0x14000 0x280 nfsidl nfsio 87623 171917 0 0 3 0x14000 0x280 nfsidl nfsio 20481 250523 0 0 3 0x14000 0x280 nfsidl nfsio 3937 269104 0 0 3 0x14000 0x280 nfsidl nfsio 45391 273142 0 0 3 0x14000 0x280 nfsidl nfsio 76198 399814 0 0 3 0x14000 0x280 nfsidl nfsio 80699 465276 0 0 3 0x14000 0x280 nfsidl nfsio 64286 447513 14608 0 3 0x2 0x80 nanoslp syz-executor 67385 219178 14608 0 3 0x2 0x80 nanoslp syz-executor 93803 457088 14608 0 3 0x2 0x80 nanoslp syz-executor 2418 78003 14608 0 3 0x2 0x80 nanoslp syz-executor 91690 168681 14608 0 3 0x2 0x80 nanoslp syz-executor 82331 472078 14608 0 3 0x2 0x80 nanoslp syz-executor 44760 290216 14608 0 3 0x2 0x80 nanoslp syz-executor 57544 223253 14608 0 3 0x2 0x80 nanoslp syz-executor 14608 50635 95047 0 3 0x2 0x80 kqread syz-executor 95047 318188 27101 0 3 0x100002 0x88 sigsusp ksh 27101 128676 63678 0 3 0x10 0x88 kqread sshd-session 63678 90063 76807 0 3 0x12 0x80 kqread sshd-session 76807 152268 1 0 3 0 0x88 kqread sshd 70492 200349 87990 74 3 0x1100012 0x80 bpf pflogd 87990 117799 1 0 3 0 0x80 sbwait pflogd 92483 486842 19419 73 3 0x1100010 0x80 kqread syslogd 19419 518138 1 0 3 0x100002 0x80 sbwait syslogd 92008 174919 1 0 3 0x100000 0x80 kqread resolvd 98916 77374 32690 77 3 0x100012 0x80 kqread dhcpleased 4381 498887 32690 77 3 0x100012 0x80 kqread dhcpleased 32690 317573 1 0 3 0 0x80 kqread dhcpleased 27698 120773 0 0 3 0x14000 0x200 bored smr 47467 520922 0 0 2 0x14000 0x200 zerothread 54391 184024 0 0 3 0x14000 0x200 aiodoned aiodoned 51435 176055 0 0 3 0x14000 0x200 syncer update 11817 456642 0 0 3 0x14000 0x200 cleaner cleaner 90725 475296 0 0 3 0x14000 0x200 reaper reaper 68689 167300 0 0 3 0x14000 0x200 pgdaemon pagedaemon 69863 34067 0 0 3 0x14000 0x200 bored viomb 15166 259296 0 0 3 0x14000 0x40000200 acpi0 acpi0 67213 361298 0 0 7 0x14000 0x40000200 idle1 54122 72535 0 0 3 0x14000 0x200 bored softnet1 80858 53117 0 0 3 0x14000 0x200 bored softnet0 52273 378747 0 0 3 0x14000 0x200 bored systqmp 45086 257226 0 0 3 0x14000 0x200 bored systq 27920 360216 0 0 3 0x14000 0x200 tmoslp softclockmp 4068 217817 0 0 3 0x14000 0x40000200 tmoslp softclock 13129 322996 0 0 3 0x14000 0x40000200 idle0 1 370771 0 0 3 0x40000002 0x80 wait init 0 0 -1 0 3 0x10010000 0x200 scheduler swapper ddb{0}> show all locks Process 88562 (syz-executor) thread 0xffff80003c4a42d0 (199614) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a6eb80) #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:1029 #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:791 #6 Xsyscall+0x128 exclusive rwlock sbufrcv r = 0 (0xffff8000016d5028) #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:890 #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:791 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11086 12288K 12478K 166960K 12614 0 pcb 19 13K 13K 166960K 94 0 rtable 247 20K 20K 166960K 511 0 pf 40 19K 26K 166960K 390 0 ifaddr 37 6K 7K 166960K 55 0 ifgroup 55 2K 2K 166960K 73 0 sysctl 1 1K 9K 166960K 8 0 counters 70 37K 37K 166960K 98 0 ioctlops 0 0K 4K 166960K 1717 0 iov 0 0K 16K 166960K 15 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1327 83K 84K 166960K 1682 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 89 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 18 65K 93K 166960K 486 0 sigio 0 0K 0K 166960K 2 0 proc 75 131K 180K 166960K 587 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 2 0K 0K 166960K 67 0 in_multi 77 5K 6K 166960K 99 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 15 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 475 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 259 164K 173K 166960K 6157 0 UVM aobj 8 2K 2K 166960K 9 0 pinsyscall 43 86K 105K 166960K 1646 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 9 0 NDP 12 0K 2K 166960K 36 0 temp 43 9123K 9166K 166960K 29845 0 kqueue 13 20K 28K 166960K 92 0 SYN cache 2 16K 24K 166960K 3 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 57 0 54 1 0 1 1 0 8 0 rtentry 176 117 0 24 6 0 6 6 0 8 0 unpcb 144 170 0 151 3 1 2 2 0 8 1 syncache 336 6 0 6 2 1 1 1 0 8 1 tcpcb 736 139 0 133 4 3 1 4 0 8 0 arp 136 19 0 4 1 0 1 1 0 8 0 inpcb 328 642 0 592 13 3 10 10 0 8 5 nd6 152 28 0 7 2 0 2 2 0 8 0 pkpcb 40 3 0 3 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 13 0 13 2 1 1 1 0 8 1 pfstscr 40 8 0 7 1 0 1 1 0 8 0 pffrag 232 6 0 0 1 0 1 1 0 482 0 pffrnode 88 6 0 0 1 0 1 1 0 8 0 pffrent 40 8 0 2 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 pfrktable 1344 8 0 2 1 0 1 1 0 8 0 pfstlim 224 1 0 1 1 0 1 1 0 8 1 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 57 0 4 1 0 1 1 0 8 0 pfstkey 128 63 0 10 2 0 2 2 0 8 0 pfstate 448 58 0 6 6 0 6 6 0 8 0 pfrule 1360 90 0 82 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 480 0 97 30 0 30 30 0 8 3 art_table 40 482 0 97 5 0 5 5 0 8 0 art_node 32 117 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 0 1 0 1 1 0 8 0 semapl 72 84 0 74 1 0 1 1 0 8 0 shmpl 112 6 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2216 0 751 93 0 93 93 0 8 0 ffsino 296 2216 0 751 114 0 114 114 0 8 0 nchpl 144 2917 0 1208 64 0 64 64 0 8 0 rtmask 32 4 0 4 2 1 1 1 0 8 1 vnodes 216 2512 0 0 140 0 140 140 0 8 0 namei 1024 9445 0 9445 2 1 1 2 0 8 1 percpumem 16 65 0 14 1 0 1 1 0 8 0 pfiaddrpl 120 2 0 0 1 0 1 1 0 8 0 kstatmem 264 45 0 16 4 1 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 11682 0 11682 4 3 1 3 1 8 1 plimitpl 152 134 0 116 1 0 1 1 0 8 0 sigapl 424 824 0 756 8 0 8 8 0 8 0 knotepl 120 830 0 0 26 0 26 26 0 8 0 kqueuepl 224 158 0 148 4 1 3 3 0 8 2 pipepl 344 153 0 125 3 0 3 3 0 8 0 fdescpl 528 788 0 756 3 0 3 3 0 8 0 filepl 160 4189 0 3915 18 4 14 15 0 8 2 lockfpl 104 246 0 241 1 0 1 1 0 8 0 lockfspl 48 118 0 113 1 0 1 1 0 8 0 sessionpl 144 76 0 66 1 0 1 1 0 8 0 pgrppl 48 86 0 68 1 0 1 1 0 8 0 ucredpl 104 455 0 441 1 0 1 1 0 8 0 zombiepl 144 756 0 756 1 0 1 1 0 8 1 processpl 1232 824 0 756 6 0 6 6 0 8 0 procpl 664 1410 0 1328 8 0 8 8 0 8 0 sosppl 176 3 0 3 1 1 0 1 0 8 0 sockpl 752 880 0 808 19 5 14 14 0 8 6 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k128 9344 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mextrefs 64 18 0 0 1 0 1 1 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 197 0 0 13 0 13 13 0 8 0 bufpl 272 4291 0 108 279 0 279 279 0 8 0 anonpl 32 9135 0 0 74 0 74 74 0 247 0 amapchunkpl 152 25874 0 25240 43 13 30 43 0 158 5 amappl16 200 2509 0 2454 18 9 9 17 0 8 0 amappl15 192 22 0 22 2 2 0 1 0 8 0 amappl14 184 431 0 430 1 0 1 1 0 8 0 amappl13 176 123 0 111 1 0 1 1 0 8 0 amappl12 168 1041 0 1009 2 0 2 2 0 8 0 amappl11 160 68 0 68 1 1 0 1 0 8 0 amappl10 152 65 0 50 1 0 1 1 0 8 0 amappl9 144 274 0 273 1 0 1 1 0 8 0 amappl8 136 104 0 101 1 0 1 1 0 8 0 amappl7 128 148 0 135 1 0 1 1 0 8 0 amappl6 120 155 0 154 1 0 1 1 0 8 0 amappl5 112 108 0 96 1 0 1 1 0 8 0 amappl4 104 296 0 275 1 0 1 1 0 8 0 amappl3 96 3492 0 3381 3 0 3 3 0 8 0 amappl2 88 910 0 829 2 0 2 2 0 8 0 amappl1 80 11734 0 11123 15 2 13 15 0 8 0 amappl 88 5371 0 5184 5 0 5 5 0 92 0 uvmvnodes 80 112 0 0 3 0 3 3 0 8 0 dma65536 65536 2 0 2 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 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 8 0 1 1 0 1 1 0 8 0 uaddrrnd 24 788 0 756 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 788 0 756 1 0 1 1 0 8 0 vmmpekpl 168 8252 0 8216 2 0 2 2 0 8 0 vmmpepl 168 57874 0 55846 100 9 91 100 0 357 2 vmsppl 488 787 0 756 5 1 4 5 0 8 0 rwobjpl 80 18751 0 17627 28 1 27 28 0 8 0 pdppl 4096 1583 0 1512 105 34 71 85 0 8 0 pvpl 32 16328 0 0 133 1 132 132 0 265 0 pmappl 256 787 0 756 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 570 0 44 16 0 16 16 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(fffff1806ee18590,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffff1806ee18578,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffff1806ee18578,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffff180609fa628,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffff180609fa628,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576 vfs_getcwd_common(fffff180609fa628,fffff180609fa988,0,0,200,0,600846afc86b2fe1) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffff180609fa628,fffff180609fa988,ffff80003c4a42d0) at vn_isunder+0x56 sys/kern/vfs_vnops.c:700 unp_externalize(fffff1806d874400,f0,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff8000016d4f38,ffff800039f9d2a8,ffff800039f9d258,0,ffff800039f9d290,ffff800039f9d41c,6a5321d2363dd581) at soreceive+0xc24 sys/kern/uipc_socket.c:1029 recvit(ffff80003c4a42d0,6,ffff800039f9d3f0,0,ffff800039f9d4a0) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff80003c4a42d0,ffff800039f9d550,ffff800039f9d4a0) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff800039f9d550) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039f9d550) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3dffc981f90, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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(ffff80002999dff0) at sched_idle+0x371 sys/kern/kern_sched.c:192 end trace frame: 0x0, count: -5