witness: lock order reversal: 1st 0xffff8000014a1c70 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806af84a20 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff834013ba -> 0xffffffff833759dd is missing lock order [2] inode (&ip->i_lock) -> [3] 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+0xdf9 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 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] sbufsnd (&so->so_snd.sb_lock) #0 rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 #1 sblock+0xb6 sys/kern/uipc_socket2.c:536 #2 sosplice+0x312 sys/kern/uipc_socket.c:1335 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1227 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #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:438 witness_checkorder(fffffd806af84a20,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806af84a08,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806af84a08,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd80681e6718,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd80681e6718,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff8000357ed100) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff8000357ed100) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff8000014a1a88,fffffd806d7fd400,ffff8000358074f0) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff8000014a1a88,fffffd805a900800,fffffd806d7fd400,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff8000014a1a88,fffffd806d7fd400,ffff8000357ed388,0,0,e) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff8000358074f0,5,ffff8000357ed508,e,ffff8000357ed5c0) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff8000358074f0,ffff8000357ed670,ffff8000357ed5c0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff8000357ed670) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000357ed670) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3e03b2b2000, count: -15 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff8000357ecd70 rbx 0 rdx 0xffff800001487a00 rcx 0xffff8000358074f0 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff8000357ecc50 r9 0x8080808080808080 r10 0x9c702660ff908e8 r11 0xbd795d4bcc055420 r12 0xfffffd8003f41880 r13 0xfffffd8004728e00 r14 0x3 r15 0xffffffff8340ae0e substchar+0x3fb2 rip 0xffffffff82f02855 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000357ecd60 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=303686 pid=56253 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800035806fc0,0xffff800035807cc8 process=0xffff80002a3cc4e8 user=0xffff8000357e8000, vmspace=0xfffffd806caec9a8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 92746 241769 40493 0 7 0x100002 sh 41089 36983 66671 0 2 0 syz-executor 41089 187235 66671 0 3 0x4000080 fsleep syz-executor 87790 184445 0 0 3 0x14280 nfsidl nfsio 49126 294195 0 0 3 0x14280 nfsidl nfsio 60802 149188 0 0 3 0x14280 nfsidl nfsio 66988 233088 0 0 3 0x14280 nfsidl nfsio 23875 287358 0 0 3 0x14280 nfsidl nfsio 37505 314121 0 0 3 0x14280 nfsidl nfsio 79041 433585 0 0 3 0x14280 nfsidl nfsio 10394 416711 0 0 3 0x14280 nfsidl nfsio 37847 98839 0 0 3 0x14280 nfsidl nfsio 29836 240808 0 0 3 0x14280 nfsidl nfsio 61637 201736 0 0 3 0x14280 nfsidl nfsio 60178 89315 0 0 3 0x14280 nfsidl nfsio 79214 439915 0 0 3 0x14280 nfsidl nfsio 75512 70797 0 0 3 0x14280 nfsidl nfsio 34081 43996 0 0 3 0x14280 nfsidl nfsio 31958 158470 0 0 3 0x14280 nfsidl nfsio 4323 400509 0 0 3 0x14280 nfsidl nfsio 97232 6339 0 0 3 0x14280 nfsidl nfsio 49045 106785 0 0 3 0x14280 nfsidl nfsio 30474 235502 0 0 3 0x14280 nfsidl nfsio 76292 192369 43361 0 2 0 syz-executor 76292 90981 43361 0 3 0x4000080 fsleep syz-executor 90108 150810 11658 0 2 0 syz-executor 90108 168128 11658 0 3 0x4000080 fsleep syz-executor 63223 9550 93392 0 2 0 syz-executor 63223 498347 93392 0 3 0x4000080 fsleep syz-executor 63223 100050 93392 0 2 0x4000000 syz-executor 80775 497812 16489 0 2 0 syz-executor 80775 152835 16489 0 3 0x4000080 fsleep syz-executor 40493 270141 42239 0 3 0x82 wait syz-executor 90982 462987 13206 0 3 0x80 nanoslp syz-executor 90982 518376 13206 0 3 0x4000080 kqread syz-executor 90982 249844 13206 0 3 0x4000080 fsleep syz-executor 90982 69805 13206 0 3 0x4000080 fsleep syz-executor 56253 142482 93635 0 2 0 syz-executor *56253 303686 93635 0 7 0x4000000 syz-executor 56253 334447 93635 0 3 0x4000080 fsleep syz-executor 93635 79668 42239 0 3 0x82 nanoslp syz-executor 27336 108363 0 0 3 0x14200 acct acct 11658 333318 42239 0 3 0x82 nanoslp syz-executor 43361 495456 42239 0 2 0x2 syz-executor 66671 470019 42239 0 3 0x82 nanoslp syz-executor 13206 410181 42239 0 3 0x82 nanoslp syz-executor 16489 492246 42239 0 3 0x82 nanoslp syz-executor 93392 481637 42239 0 3 0x82 nanoslp syz-executor 42239 412820 70141 0 3 0x82 kqread syz-executor 70141 487236 8223 0 3 0x10008a sigsusp ksh 8223 95273 49594 0 3 0x98 kqread sshd-session 49594 515721 14842 0 3 0x92 kqread sshd-session 1332 497180 1 0 3 0x100083 ttyin getty 14842 220957 1 0 3 0x88 kqread sshd 1279 409448 33050 74 3 0x1100092 bpf pflogd 33050 159894 1 0 3 0x80 sbwait pflogd 37744 122594 81981 73 3 0x1100090 kqread syslogd 81981 275721 1 0 3 0x100082 sbwait syslogd 97380 369920 1 0 3 0x100080 kqread resolvd 31960 327263 5316 77 3 0x100092 kqread dhcpleased 21030 370736 5316 77 3 0x100092 kqread dhcpleased 5316 174362 1 0 3 0x80 kqread dhcpleased 52077 314516 0 0 3 0x14200 bored smr 78082 230485 0 0 2 0x14200 zerothread 72868 425660 0 0 3 0x14200 aiodoned aiodoned 11864 48141 0 0 3 0x14200 syncer update 16355 41459 0 0 3 0x14200 cleaner cleaner 62174 134225 0 0 3 0x14200 reaper reaper 4462 11443 0 0 3 0x14200 pgdaemon pagedaemon 69390 340671 0 0 3 0x14200 bored viomb 9566 139152 0 0 3 0x40014200 acpi0 acpi0 14009 152283 0 0 3 0x40014200 idle1 88884 247212 0 0 3 0x14200 bored softnet1 66634 505167 0 0 3 0x14200 bored softnet0 46870 125308 0 0 3 0x14200 bored systqmp 86817 411887 0 0 3 0x14200 bored systq 18338 208764 0 0 3 0x14200 tmoslp softclockmp 76551 100332 0 0 3 0x40014200 tmoslp softclock 14604 239215 0 0 3 0x40014200 idle0 1 145915 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 56253 (syz-executor) thread 0xffff8000358074f0 (303686) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83933048) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 unp_connect+0x28c sys/kern/uipc_usrreq.c:872 #2 uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 #3 sosend+0x804 sys/kern/uipc_socket.c:-1 #4 sendit+0x5a5 sys/kern/uipc_syscalls.c:785 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 #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 exclusive rwlock sbufsnd r = 0 (0xffff8000014a1c70) #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 sosend+0x2e9 sys/kern/uipc_socket.c:639 #4 sendit+0x5a5 sys/kern/uipc_syscalls.c:785 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 #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 10204 11037K 11835K 166960K 12399 0 pcb 17 12K 13K 166960K 140 0 rtable 176 7K 8K 166960K 480 0 pf 31 17K 81K 166960K 100 0 ifaddr 33 5K 7K 166960K 82 0 ifgroup 47 2K 2K 166960K 125 0 sysctl 2 1K 9K 166960K 11 0 counters 64 36K 37K 166960K 130 0 ioctlops 0 0K 4K 166960K 1562 0 iov 0 0K 12K 166960K 29 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1429 90K 90K 166960K 2137 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 87 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 721 0 sigio 0 0K 0K 166960K 10 0 proc 72 115K 164K 166960K 639 0 subproc 72 4K 4K 166960K 93 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 65 0 in_multi 67 5K 7K 166960K 142 0 ether_multi 1 0K 0K 166960K 12 0 mrt 1 0K 0K 166960K 12 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 115 519K 519K 166960K 115 0 exec 0 0K 1K 166960K 600 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 235 153K 180K 166960K 8538 0 UVM aobj 22 8K 10K 166960K 24 0 pinsyscall 43 86K 102K 166960K 1940 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 35 0 NDP 10 0K 2K 166960K 50 0 temp 52 8661K 8730K 166960K 37404 0 kqueue 16 22K 30K 166960K 154 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 82 0 78 1 0 1 1 0 8 0 rtentry 176 144 0 71 6 0 6 6 0 8 0 unpcb 144 654 0 636 2 0 2 2 0 8 1 syncache 336 8 0 8 2 1 1 1 0 8 1 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 229 0 223 7 0 7 7 0 8 6 arp 136 23 0 8 1 0 1 1 0 8 0 inpcb 328 656 0 647 8 1 7 7 0 8 6 nd6 152 29 0 12 1 0 1 1 0 8 0 pkpcb 40 3 0 3 2 1 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 21 0 21 1 0 1 1 0 8 1 pppxif 1504 6 0 6 1 0 1 1 0 8 1 pffrag 232 8 0 0 1 0 1 1 0 482 0 pffrnode 88 8 0 0 1 0 1 1 0 8 0 pffrent 40 10 0 2 1 0 1 1 0 8 0 pfosfp 40 1430 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1430 0 714 21 0 21 21 0 8 0 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pfstitem 24 56 0 12 1 0 1 1 0 8 0 pfstkey 128 56 0 12 2 0 2 2 0 8 0 pfstate 448 56 0 12 6 0 6 6 0 8 0 pfrule 1344 22 0 16 2 0 2 2 0 8 0 rttmr 136 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 660 0 339 32 2 30 31 0 8 5 art_table 40 662 0 339 5 0 5 5 0 8 0 art_node 32 143 0 78 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 3 1 0 1 1 0 8 0 semapl 112 85 0 75 1 0 1 1 0 8 0 shmpl 112 17 0 1 1 0 1 1 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 2797 0 1287 96 0 96 96 0 8 0 ffsino 296 2797 0 1287 117 0 117 117 0 8 0 nchpl 144 3769 0 2066 64 0 64 64 0 8 0 rtmask 32 4 0 4 2 1 1 1 0 8 1 vnodes 216 3295 0 0 184 0 184 184 0 8 0 namei 1024 12963 0 12962 2 1 1 2 0 8 0 percpumem 16 80 0 33 1 0 1 1 0 8 0 vcpupl 3968 4 0 1 1 0 1 1 0 8 0 vmpool 840 4 0 1 1 0 1 1 0 8 0 kstatmem 264 66 0 44 3 1 2 3 0 8 0 scsiplug 72 5 0 5 1 1 0 1 0 8 0 scxspl 216 22769 0 22769 9 8 1 8 1 8 1 plimitpl 152 205 0 187 1 0 1 1 0 8 0 sigapl 424 1080 0 1011 9 1 8 8 0 8 0 knotepl 120 737 0 0 23 0 23 23 0 8 0 kqueuepl 224 230 0 219 2 1 1 2 0 8 0 pipepl 344 244 0 217 3 0 3 3 0 8 0 fdescpl 528 1022 0 990 3 0 3 3 0 8 0 filepl 160 6002 0 5785 16 0 16 16 0 8 6 lockfpl 104 193 0 191 1 0 1 1 0 8 0 lockfspl 48 91 0 89 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 48 0 31 1 0 1 1 0 8 0 ucredpl 104 1143 0 1130 1 0 1 1 0 8 0 zombiepl 144 1011 0 1011 1 0 1 1 0 8 1 processpl 1232 1080 0 1011 7 1 6 6 0 8 0 procpl 664 2101 0 2021 7 0 7 7 0 8 0 sosppl 176 3 0 3 1 1 0 1 0 8 0 sockpl 752 1415 0 1384 12 1 11 11 0 8 7 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 37 0 0 4 0 4 4 0 8 0 mtagpl 96 14 0 0 1 0 1 1 0 8 0 mbufpl 256 1455 0 0 91 0 91 91 0 8 0 bufpl 280 9066 0 2929 439 0 439 439 0 8 0 anonpl 32 11860 0 0 96 0 96 96 0 246 0 amapchunkpl 152 28607 0 28139 44 3 41 41 0 158 18 amappl16 200 4049 0 4001 27 11 16 27 0 8 4 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 7 0 7 1 1 0 1 0 8 0 amappl13 176 465 0 463 1 0 1 1 0 8 0 amappl12 168 1408 0 1364 3 0 3 3 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 56 0 42 1 0 1 1 0 8 0 amappl9 144 255 0 255 1 1 0 1 0 8 0 amappl8 136 27 0 24 1 0 1 1 0 8 0 amappl7 128 89 0 88 1 0 1 1 0 8 0 amappl6 120 304 0 290 1 0 1 1 0 8 0 amappl5 112 78 0 67 1 0 1 1 0 8 0 amappl4 104 447 0 416 1 0 1 1 0 8 0 amappl3 96 4750 0 4662 4 1 3 3 0 8 0 amappl2 88 1158 0 1082 2 0 2 2 0 8 0 amappl1 80 12777 0 12177 14 0 14 14 0 8 0 amappl 88 7641 0 7484 5 0 5 5 0 92 0 uvmvnodes 80 125 0 0 3 0 3 3 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 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 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 23 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1022 0 990 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1022 0 990 1 0 1 1 0 8 0 vmmpekpl 168 10668 0 10631 3 0 3 3 0 8 0 vmmpepl 168 73848 0 71887 114 6 108 114 0 357 15 vmsppl 488 1021 0 990 5 0 5 5 0 8 0 rwobjpl 80 23271 0 22177 33 2 31 33 0 8 1 pdppl 4096 2060 0 1985 107 30 77 86 0 8 2 pvpl 32 21725 0 0 176 0 176 176 0 265 0 pmappl 256 1025 0 991 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 377 0 36 10 0 10 10 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(fffffd806af84a20,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806af84a08,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806af84a08,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd80681e6718,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd80681e6718,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff8000357ed100) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff8000357ed100) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff8000014a1a88,fffffd806d7fd400,ffff8000358074f0) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff8000014a1a88,fffffd805a900800,fffffd806d7fd400,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff8000014a1a88,fffffd806d7fd400,ffff8000357ed388,0,0,e) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff8000358074f0,5,ffff8000357ed508,e,ffff8000357ed5c0) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff8000358074f0,ffff8000357ed670,ffff8000357ed5c0) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff8000357ed670) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000357ed670) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3e03b2b2000, count: -15 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(ffffffff83932e40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83932e40) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff8000333e73b0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff8000333e73b0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b7faca1aa30, count: -6