witness: lock order reversal: 1st 0xffff8000013144b0 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806de20a38 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff830be9a1 -> 0xffffffff8306b4aa is missing lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock) #0 rw_enter+0x122 #1 sblock+0xb7 sys/kern/uipc_socket2.c:549 #2 soreceive+0x295 sys/kern/uipc_socket.c:945 #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+0xf6 sys/kern/vfs_vnops.c:525 #10 sys_ioctl+0x67c #11 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #11 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #12 Xsyscall+0x128 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] sbufsnd (&so->so_snd.sb_lock) #0 rw_enter+0x122 #1 sblock+0xb7 sys/kern/uipc_socket2.c:549 #2 sosplice+0x3f4 sys/kern/uipc_socket.c:1454 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1228 #4 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #4 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #5 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:437 witness_checkorder(fffffd806de20a38,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806de20a28,1) at rw_enter+0x122 rrw_enter(fffffd806de20a28,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd806e5afe78,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806e5afe78,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800031385ed8) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800031385ed8) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800001314308,fffffd806a69b000,ffff8000ffff0f58) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff800001314308,fffffd806c9dbb00,fffffd806a69b000,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff800001314308,fffffd806a69b000,ffff800031386168,0,0,8) at sosend+0xa40 sendit(ffff8000ffff0f58,3,ffff8000313862e0,8,ffff8000313863a0) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff8000ffff0f58,ffff800031386450,ffff8000313863a0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800031386450) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800031386450) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xad7130b8880, count: -15 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff800031385b30 rbx 0xfffffd80042c30a8 rdx 0xffff8000012a0a40 rcx 0xffff8000ffff0f58 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff800031385a10 r9 0x8080808080808080 r10 0x3df77dbaaa290f7b r11 0x672ac566d0060347 r12 0 r13 0xfffffd8003adae00 r14 0x3 r15 0xffffffff rip 0xffffffff81610e15 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800031385b20 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=171355 pid=35174 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff1978,0xffffffff835f1e20 process=0xffff8000fffee8c8 user=0xffff800031381000, vmspace=0xfffffd806be51568 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 35174 451386 25037 0 2 0 syz-executor 35174 441767 25037 0 3 0x4000080 fsleep syz-executor *35174 171355 25037 0 7 0x4000000 syz-executor 87263 450884 39059 0 2 0 syz-executor 87263 72132 39059 0 3 0x4000080 fsleep syz-executor 69415 97983 11675 0 2 0 syz-executor 69415 458881 11675 0 2 0x4000000 syz-executor 99122 457103 43466 0 3 0x80 nanoslp syz-executor 99122 459103 43466 0 3 0x4000080 nanoslp syz-executor 99122 325254 43466 0 3 0x4000080 fsleep syz-executor 60492 10954 62515 60929 3 0x90 nanoslp syz-executor 60492 158767 62515 60929 3 0x4000090 kqsel syz-executor 60492 54630 62515 60929 3 0x4000090 fsleep syz-executor 63334 112552 58562 0 2 0 syz-executor 63334 209974 58562 0 3 0x4000080 fsleep syz-executor 63334 355388 58562 0 3 0x4000080 fsleep syz-executor 43466 48243 9051 0 3 0x82 nanoslp syz-executor 23069 78665 35215 0 3 0x80 nanoslp syz-executor 23069 70546 35215 0 3 0x4000080 rest syz-executor 38076 173607 0 0 3 0x14200 acct acct 95138 474429 0 0 3 0x14280 nfsidl nfsio 29507 441093 0 0 3 0x14280 nfsidl nfsio 74476 479034 0 0 3 0x14280 nfsidl nfsio 39918 23077 0 0 3 0x14280 nfsidl nfsio 90157 230013 0 0 3 0x14280 nfsidl nfsio 49988 200981 0 0 3 0x14280 nfsidl nfsio 34670 164907 0 0 3 0x14280 nfsidl nfsio 85573 15686 0 0 3 0x14280 nfsidl nfsio 91711 184347 0 0 3 0x14280 nfsidl nfsio 94260 477 0 0 3 0x14280 nfsidl nfsio 45801 63972 0 0 3 0x14280 nfsidl nfsio 46135 14179 0 0 3 0x14280 nfsidl nfsio 75320 330468 0 0 3 0x14280 nfsidl nfsio 72505 267640 0 0 3 0x14280 nfsidl nfsio 55145 45171 0 0 3 0x14280 nfsidl nfsio 48878 422415 0 0 3 0x14280 nfsidl nfsio 25953 140651 0 0 3 0x14280 nfsidl nfsio 42833 489788 0 0 3 0x14280 nfsidl nfsio 65536 274417 0 0 3 0x14280 nfsidl nfsio 15176 30372 0 0 3 0x14280 nfsidl nfsio 57216 13270 1 0 3 0x100083 ttyin getty 21592 64275 9051 0 3 0x82 piperd syz-executor 39059 347982 9051 0 3 0x82 nanoslp syz-executor 35215 329456 9051 0 3 0x82 nanoslp syz-executor 61942 92980 0 0 3 0x14200 bored sosplice 66957 66382 15098 0 3 0x100082 sbwait arp 15098 308665 1 0 3 0x10008a sigsusp sh 25037 81248 9051 0 3 0x82 nanoslp syz-executor 58562 299829 9051 0 3 0x82 nanoslp syz-executor 11675 217281 9051 0 3 0x82 nanoslp syz-executor 62515 466964 9051 0 3 0x82 nanoslp syz-executor 9051 326472 11977 0 2 0x2 syz-executor 11977 330653 9191 0 3 0x10008a sigsusp ksh 9191 381276 22812 0 3 0x98 kqread sshd-session 22812 186789 42652 0 3 0x92 kqread sshd-session 42652 115979 1 0 3 0x88 kqread sshd 24253 332636 55916 74 3 0x1100092 bpf pflogd 55916 280147 1 0 3 0x80 sbwait pflogd 50729 181741 67468 73 3 0x1100090 kqread syslogd 67468 241045 1 0 3 0x100082 sbwait syslogd 87104 20970 1 0 3 0x100080 kqread resolvd 52200 482055 46041 77 3 0x100092 kqread dhcpleased 28950 255353 46041 77 3 0x100092 kqread dhcpleased 46041 373854 1 0 3 0x80 kqread dhcpleased 77936 441824 0 0 3 0x14200 bored smr 33237 235318 0 0 2 0x14200 zerothread 90435 283113 0 0 3 0x14200 aiodoned aiodoned 92362 181870 0 0 3 0x14200 syncer update 3769 53531 0 0 3 0x14200 cleaner cleaner 974 314360 0 0 3 0x14200 reaper reaper 67779 395150 0 0 3 0x14200 pgdaemon pagedaemon 69028 84092 0 0 3 0x14200 bored viomb 72939 36942 0 0 3 0x40014200 acpi0 acpi0 43489 265074 0 0 7 0x40014200 idle1 58004 113821 0 0 3 0x14200 bored softnet3 23845 29312 0 0 3 0x14200 bored softnet2 55698 153841 0 0 3 0x14200 bored softnet1 1947 186366 0 0 3 0x14200 bored softnet0 47424 520725 0 0 3 0x14200 bored systqmp 44132 385599 0 0 3 0x14200 bored systq 87258 186337 0 0 3 0x14200 tmoslp softclockmp 56280 511847 0 0 3 0x40014200 tmoslp softclock 19409 414340 0 0 3 0x40014200 idle0 1 211520 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 35174 (syz-executor) thread 0xffff8000ffff0f58 (171355) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8359d538) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 unp_connect+0x26c sys/kern/uipc_usrreq.c:868 #2 uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 #3 sosend+0xa40 #4 sendit+0x721 sys/kern/uipc_syscalls.c:786 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 #6 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff8000013144b0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 sblock+0xb7 sys/kern/uipc_socket2.c:549 #3 sosend+0x2ff sys/kern/uipc_socket.c:681 #4 sendit+0x721 sys/kern/uipc_syscalls.c:786 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 #6 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10195 11134K 11795K 166960K 14517 0 pcb 17 15K 16K 166960K 566 0 rtable 228 7K 8K 166960K 792 0 pf 39 18K 25K 166960K 138 0 ifaddr 44 7K 7K 166960K 84 0 ifgroup 55 2K 2K 166960K 121 0 sysctl 4 1K 1K 166960K 8 0 counters 64 36K 36K 166960K 96 0 ioctlops 0 0K 8K 166960K 1705 0 iov 0 0K 16K 166960K 100 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1531 96K 96K 166960K 3015 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 6K 10K 166960K 37 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 144 0 dirhash 12 2K 2K 166960K 57 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 19 69K 93K 166960K 1975 0 sigio 0 0K 0K 166960K 144 0 proc 73 91K 128K 166960K 877 0 subproc 117 7K 7K 166960K 169 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 418 0 in_multi 89 6K 7K 166960K 205 0 ether_multi 1 0K 0K 166960K 2 0 mrt 2 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 886 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 255 73K 87K 166960K 19874 0 UVM aobj 143 8K 8K 166960K 148 0 pinsyscall 45 90K 106K 166960K 3222 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 176 0 NDP 14 0K 2K 166960K 55 0 temp 79 6828K 7076K 166960K 45273 0 kqueue 14 22K 28K 166960K 306 0 SYN cache 2 10K 18K 166960K 3 0 ddb{0}> 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 120 206 0 202 2 1 1 2 0 8 0 rtentry 112 205 0 103 5 1 4 4 0 8 0 unpcb 144 1751 0 1732 22 17 5 9 0 8 4 syncache 336 13 0 13 4 3 1 1 0 8 1 tcpqe 32 6 0 6 4 3 1 1 0 8 1 tcpcb 808 620 0 612 16 9 7 8 0 8 5 arp 120 41 0 20 1 0 1 1 0 8 0 inpcb 336 2724 0 2712 39 33 6 13 0 8 4 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 40 2 0 2 1 1 0 1 0 8 0 nd6 136 45 0 21 1 0 1 1 0 8 0 pkpcb 40 6 0 6 4 4 0 1 0 8 0 kcovpl 48 13 0 4 1 0 1 1 0 8 0 ppxss 1168 4 0 4 4 3 1 1 0 8 1 pfstscr 40 2 0 2 2 1 1 1 0 8 1 pffrag 232 14 0 3 1 0 1 1 0 482 0 pffrnode 88 12 0 3 1 0 1 1 0 8 0 pffrent 40 29 0 18 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 pfanchor 1288 4 0 3 1 0 1 1 0 8 0 pfstitem 24 165 0 35 1 0 1 1 0 8 0 pfstkey 128 176 0 45 6 1 5 5 0 8 0 pfstate 376 169 0 41 13 0 13 13 0 8 0 pfrule 1344 38 0 23 2 0 2 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 802 0 392 33 7 26 28 0 8 0 art_table 32 805 0 392 4 0 4 4 0 8 0 art_node 16 196 0 108 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 139 0 129 1 0 1 1 0 8 0 shmpl 112 145 0 5 4 0 4 4 0 8 0 dirhash 1024 48 0 31 3 0 3 3 0 8 0 dino2pl 256 4711 0 3201 95 0 95 95 0 8 0 ffsino 272 4711 0 3201 102 0 102 102 0 8 0 nchpl 144 7454 0 5759 64 0 64 64 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 28969 0 28968 4 3 1 2 0 8 0 percpumem 16 62 0 16 1 0 1 1 0 8 0 kstatmem 264 56 0 32 2 0 2 2 0 8 0 scsiplug 72 13 0 13 3 2 1 1 0 8 1 scxspl 216 23944 0 23944 10 9 1 8 1 8 1 plimitpl 152 765 0 747 1 0 1 1 0 8 0 sigapl 424 2301 0 2228 9 0 9 9 0 8 0 futexpl 64 28543 0 28537 1 0 1 1 0 8 0 knotepl 120 602 0 0 18 0 18 18 0 8 0 kqueuepl 216 698 0 688 10 7 3 5 0 8 2 pipepl 320 304 0 274 5 0 5 5 0 8 2 fdescpl 496 2257 0 2224 5 0 5 5 0 8 0 filepl 152 16926 0 16659 36 20 16 19 0 8 3 lockfpl 104 872 0 869 2 1 1 2 0 8 0 lockfspl 48 363 0 360 1 0 1 1 0 8 0 sessionpl 144 38 0 29 1 0 1 1 0 8 0 pgrppl 48 143 0 125 1 0 1 1 0 8 0 ucredpl 104 3549 0 3534 1 0 1 1 0 8 0 zombiepl 144 2464 0 2464 2 1 1 1 0 8 1 processpl 1160 2301 0 2228 6 0 6 6 0 8 0 procpl 648 5144 0 5060 8 0 8 8 0 8 0 srpgc 96 8 0 8 3 3 0 1 0 8 0 sosppl 168 15 0 15 4 3 1 1 0 8 1 sockpl 664 4781 0 4747 70 59 11 22 0 8 7 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 137 0 0 18 0 18 18 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 112 0 0 14 1 13 14 0 8 0 mtagpl 96 159 0 0 4 0 4 4 0 8 0 mbufpl 256 417 0 0 24 0 24 24 0 8 0 bufpl 280 6783 0 609 442 0 442 442 0 8 0 anonpl 24 336167 0 328007 104 48 56 56 0 185 6 amapchunkpl 152 65392 0 64752 49 21 28 31 0 158 3 amappl16 200 8206 0 7997 43 27 16 18 0 8 5 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 170 0 157 1 0 1 1 0 8 0 amappl13 176 8 0 8 2 2 0 1 0 8 0 amappl12 168 2995 0 2960 4 1 3 3 0 8 0 amappl11 160 52 0 37 1 0 1 1 0 8 0 amappl10 152 74 0 73 1 0 1 1 0 8 0 amappl9 144 161 0 159 1 0 1 1 0 8 0 amappl8 136 25 0 22 1 0 1 1 0 8 0 amappl7 128 135 0 122 1 0 1 1 0 8 0 amappl6 120 213 0 210 1 0 1 1 0 8 0 amappl5 112 159 0 146 1 0 1 1 0 8 0 amappl4 104 365 0 345 1 0 1 1 0 8 0 amappl3 96 12015 0 11908 3 0 3 3 0 8 0 amappl2 88 2636 0 2549 3 0 3 3 0 8 0 amappl1 80 15759 0 15173 14 0 14 14 0 8 0 amappl 88 19281 0 19090 5 0 5 5 0 92 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 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 7 0 7 2 2 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 147 0 5 3 0 3 3 0 8 0 uaddrrnd 24 2257 0 2224 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2257 0 2224 1 0 1 1 0 8 0 vmmpekpl 168 18645 0 18595 3 0 3 3 0 8 0 vmmpepl 168 144863 0 142728 124 25 99 100 0 357 6 vmsppl 448 2256 0 2224 6 1 5 5 0 8 0 rwobjpl 56 45992 0 38746 103 0 103 103 0 8 0 pdppl 4096 4521 0 4448 137 60 77 85 0 8 4 pvpl 32 16467 0 0 134 1 133 133 0 265 0 pmappl 248 2256 0 2224 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 510 0 124 12 0 12 12 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:437 witness_checkorder(fffffd806de20a38,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806de20a28,1) at rw_enter+0x122 rrw_enter(fffffd806de20a28,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd806e5afe78,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806e5afe78,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800031385ed8) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800031385ed8) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800001314308,fffffd806a69b000,ffff8000ffff0f58) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff800001314308,fffffd806c9dbb00,fffffd806a69b000,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff800001314308,fffffd806a69b000,ffff800031386168,0,0,8) at sosend+0xa40 sendit(ffff8000ffff0f58,3,ffff8000313862e0,8,ffff8000313863a0) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff8000ffff0f58,ffff800031386450,ffff8000313863a0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800031386450) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800031386450) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xad7130b8880, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b7bff0) 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 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffff800029b7bff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5