witness: lock order reversal: 1st 0xffff800010fe0fb8 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd806e10c9e8 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff832f9abd -> 0xffffffff8334590b 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:870 #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+0xdfb 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:746 #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(fffffd806e10c9e8,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806e10c9d0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806e10c9d0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd805f67f038,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd805f67f038,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805f67f038,fffffd805f67f038,0,0,200,0,c599533d4629b75e) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805f67f038,fffffd805f67f038,ffff80003bc082b8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd805f372300,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff800010fe0ec8,ffff800039ff9128,ffff800039ff90d8,0,ffff800039ff9110,ffff800039ff929c,705d3e6a72d74ffa) at soreceive+0xc24 sys/kern/uipc_socket.c:1009 recvit(ffff80003bc082b8,4,ffff800039ff9270,0,ffff800039ff9320) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff80003bc082b8,ffff800039ff93d0,ffff800039ff9320) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff800039ff93d0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039ff93d0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbbe70e34620, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff800039ff8bc0 rbx 0 rdx 0xffff80000147d940 rcx 0xffff80003bc082b8 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff800039ff8aa0 r9 0x8080808080808080 r10 0x5c3fde1cfd7d30e8 r11 0x69a8ab84e9c34065 r12 0xfffffd8003eff640 r13 0xfffffd80046e7130 r14 0x3 r15 0xffffffff833e2b64 substchar+0xf1da rip 0xffffffff831577a5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800039ff8bb0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=297670 pid=183 tcnt=2 stat=onproc flags process=1000010 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003bc094e0,0xffffffff83917b08 process=0xffff80002a3cf038 user=0xffff800039ff4000, vmspace=0xfffffd806c7215e0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 183 466920 43789 0 2 0x1000010 syz-executor * 183 297670 43789 0 7 0x5000010 syz-executor 35023 376310 82088 0 3 0x80 nanoslp syz-executor 35023 192341 82088 0 3 0x4000000 smrbar syz-executor 35023 475628 82088 0 3 0x4000080 fsleep syz-executor 27463 352598 10382 0 2 0 syz-executor 27463 34392 10382 0 3 0x4000080 fsleep syz-executor 27463 422089 10382 0 3 0x4000080 netcon syz-executor 59893 446468 95367 0 3 0x3000 suspend syz-executor 59893 388498 95367 0 3 0x4081000 biowait syz-executor 59893 14453 95367 0 3 0x4081000 fltagain2 syz-executor 59893 266039 95367 0 3 0x4081000 fltagain2 syz-executor 5740 284803 20336 0 3 0x80 nanoslp syz-executor 5740 338737 20336 0 3 0x4000080 kqsel syz-executor 5740 402764 20336 0 3 0x4000080 fsleep syz-executor 83627 516196 43419 0 3 0x80 nanoslp syz-executor 83627 396450 43419 0 3 0x4000080 ttyopn syz-executor 83627 510222 43419 0 3 0x4000080 fsleep syz-executor 83237 247232 0 0 3 0x14200 acct acct 81443 482006 22241 0 3 0x82 sbwait sshd-session 81780 336250 0 0 3 0x14200 bored sosplice 10382 399642 62202 0 3 0x82 nanoslp syz-executor 48765 109950 62202 0 3 0x82 nanoslp syz-executor 82088 429644 62202 0 3 0x82 nanoslp syz-executor 20336 19250 62202 0 3 0x82 nanoslp syz-executor 43789 458823 62202 0 3 0x82 nanoslp syz-executor 81275 354861 62202 0 3 0x82 nanoslp syz-executor 95367 461924 62202 0 3 0x82 nanoslp syz-executor 43419 279452 62202 0 3 0x82 nanoslp syz-executor 62202 83028 21606 0 3 0x82 kqread syz-executor 21606 317184 17247 0 3 0x10008a sigsusp ksh 17247 33260 45173 0 3 0x98 kqread sshd-session 45173 366336 22241 0 3 0x92 kqread sshd-session 52789 14544 1 0 3 0x100083 ttyin getty 22241 107083 1 0 3 0x88 kqread sshd 17427 144814 99552 74 3 0x1100092 bpf pflogd 99552 62902 1 0 3 0x80 sbwait pflogd 14080 286181 62345 73 3 0x1100090 kqread syslogd 62345 436105 1 0 3 0x100082 sbwait syslogd 43167 230932 1 0 3 0x100080 kqread resolvd 41370 265245 23330 77 3 0x100092 kqread dhcpleased 19989 76724 23330 77 3 0x100092 kqread dhcpleased 23330 200868 1 0 3 0x80 kqread dhcpleased 56953 299640 0 0 3 0x14200 bored smr 87047 386793 0 0 2 0x14200 zerothread 12047 381284 0 0 3 0x14200 aiodoned aiodoned 48175 497361 0 0 3 0x14200 syncer update 52708 358888 0 0 3 0x14200 cleaner cleaner 33025 148844 0 0 3 0x14200 reaper reaper 66299 149890 0 0 3 0x14200 pgdaemon pagedaemon 49050 386744 0 0 3 0x14200 bored viomb 92111 345673 0 0 3 0x40014200 acpi0 acpi0 88939 282594 0 0 7 0x40014200 idle1 25003 257043 0 0 3 0x14200 bored softnet1 88063 306417 0 0 3 0x14200 bored softnet0 74352 512725 0 0 3 0x14200 smrbar systqmp 3185 455186 0 0 3 0x14200 bored systq 39849 42435 0 0 3 0x14200 tmoslp softclockmp 96660 497501 0 0 3 0x40014200 tmoslp softclock 11720 269682 0 0 3 0x40014200 idle0 1 410498 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 183 (syz-executor) thread 0xffff80003bc082b8 (297670) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83915fc0) #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:1009 #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:746 #6 Xsyscall+0x128 exclusive rwlock sbufrcv r = 0 (0xffff800010fe0fb8) #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:870 #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:746 #7 Xsyscall+0x128 Process 35023 (syz-executor) thread 0xffff80003bc08a80 (192341) exclusive rwlock clonelk r = 0 (0xffffffff837bee88) #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 if_clone_destroy+0x67 sys/net/if.c:-1 #3 ifioctl+0x59d sys/net/if.c:2092 #4 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #6 Xsyscall+0x128 Process 59893 (syz-executor) thread 0xffff80003c458028 (388498) exclusive rrwlock inode r = 0 (0xfffffd806bdc7eb8) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #9 Xsyscall+0x128 Process 74352 (systqmp) thread 0xffff8000ffffe000 (512725) shared rwlock systqmp r = 0 (0xffffffff837992e8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10231 11103K 12714K 166960K 13632 0 pcb 19 16K 18K 166960K 260 0 rtable 205 11K 12K 166960K 411 0 pf 34 17K 19K 166960K 154 0 ifaddr 38 6K 7K 166960K 98 0 ifgroup 51 2K 2K 166960K 169 0 sysctl 4 1K 9K 166960K 16 0 counters 66 36K 37K 166960K 218 0 ioctlops 0 0K 4K 166960K 1733 0 iov 0 0K 24K 166960K 79 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1493 94K 94K 166960K 2765 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 44 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 1113 0 sigio 1 0K 0K 166960K 7 0 proc 72 115K 180K 166960K 672 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 1 0K 0K 166960K 182 0 in_multi 85 6K 7K 166960K 132 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 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 489 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 272 168K 177K 166960K 12005 0 UVM aobj 5 2K 2K 166960K 6 0 pinsyscall 45 90K 102K 166960K 2206 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 62 0 NDP 11 0K 2K 166960K 72 0 temp 73 8654K 8725K 166960K 53512 0 kqueue 18 26K 30K 166960K 215 0 SYN cache 2 8K 16K 166960K 3 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 120 180 0 177 1 0 1 1 0 8 0 rtentry 176 126 0 48 5 0 5 5 0 8 0 unpcb 144 763 0 742 8 4 4 6 0 8 3 syncache 336 10 0 10 3 2 1 1 0 8 1 tcpqe 32 2 0 2 2 1 1 1 0 8 1 tcpcb 736 437 0 425 13 5 8 8 0 8 6 arp 136 15 0 5 1 0 1 1 0 8 0 inpcb 328 1448 0 1427 14 6 8 8 0 8 5 nd6 152 22 0 6 1 0 1 1 0 8 0 pkpcb 40 9 0 9 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 4 0 4 2 2 0 1 0 8 0 ppxss 1192 66 0 66 1 0 1 1 0 8 1 pppxif 1504 5 0 5 3 2 1 1 0 8 1 pffrag 232 4 0 1 1 0 1 1 0 482 0 pffrnode 88 4 0 1 1 0 1 1 0 8 0 pffrent 40 9 0 6 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 1 0 1 1 0 1 1 0 8 1 pfstitem 24 66 0 19 1 0 1 1 0 8 0 pfstkey 128 66 0 19 2 0 2 2 0 8 0 pfstate 384 66 0 19 5 0 5 5 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 598 0 180 33 4 29 29 0 8 2 art_table 40 602 0 180 5 0 5 5 0 8 0 art_node 32 126 0 57 1 0 1 1 0 8 0 sysvmsgpl 40 44 0 7 1 0 1 1 0 8 0 semapl 112 36 0 26 1 0 1 1 0 8 0 shmpl 112 3 0 1 1 0 1 1 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 3564 0 2059 95 0 95 95 0 8 0 ffsino 296 3564 0 2059 117 0 117 117 0 8 0 nchpl 144 5204 0 3509 64 0 64 64 0 8 0 rtmask 32 16 0 16 2 1 1 1 0 8 1 uvmvnodes 80 4580 0 0 94 0 94 94 0 8 0 vnodes 216 4580 0 0 255 0 255 255 0 8 0 namei 1024 18163 0 18163 3 2 1 2 0 8 1 percpumem 16 124 0 76 1 0 1 1 0 8 0 kstatmem 264 112 0 88 4 2 2 3 0 8 0 scsiplug 72 3 0 3 2 2 0 1 0 8 0 scxspl 216 20750 0 20749 10 8 2 8 1 8 1 plimitpl 152 350 0 332 1 0 1 1 0 8 0 sigapl 424 1421 0 1370 7 1 6 7 0 8 0 knotepl 120 533 0 0 17 0 17 17 0 8 0 kqueuepl 224 504 0 489 10 5 5 5 0 8 4 pipepl 344 249 0 222 9 1 8 9 0 8 5 fdescpl 528 1396 0 1363 3 0 3 3 0 8 0 filepl 160 9862 0 9619 25 8 17 18 0 8 6 lockfpl 104 1018 0 1016 2 0 2 2 0 8 1 lockfspl 48 386 0 384 1 0 1 1 0 8 0 sessionpl 144 25 0 15 1 0 1 1 0 8 0 pgrppl 48 45 0 27 1 0 1 1 0 8 0 ucredpl 104 1744 0 1730 1 0 1 1 0 8 0 zombiepl 144 1373 0 1370 1 0 1 1 0 8 0 processpl 1232 1421 0 1370 6 1 5 5 0 8 1 procpl 664 3022 0 2959 7 1 6 7 0 8 0 sosppl 168 7 0 7 2 1 1 1 0 8 1 sockpl 752 2421 0 2376 28 15 13 17 0 8 7 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 1172 0 0 74 0 74 74 0 8 0 bufpl 280 7458 0 1315 440 0 440 440 0 8 0 anonpl 32 9768 0 0 80 1 79 79 0 246 0 amapchunkpl 152 39503 0 38931 38 10 28 29 0 158 5 amappl16 200 3669 0 3586 27 21 6 15 0 8 0 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 113 0 100 1 0 1 1 0 8 0 amappl13 176 8 0 8 1 1 0 1 0 8 0 amappl12 168 2035 0 2002 3 1 2 2 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 21 0 21 1 1 0 1 0 8 0 amappl9 144 262 0 261 1 0 1 1 0 8 0 amappl8 136 22 0 20 1 0 1 1 0 8 0 amappl7 128 108 0 95 1 0 1 1 0 8 0 amappl6 120 190 0 185 1 0 1 1 0 8 0 amappl5 112 131 0 121 1 0 1 1 0 8 0 amappl4 104 306 0 285 1 0 1 1 0 8 0 amappl3 96 6859 0 6745 4 1 3 3 0 8 0 amappl2 88 1677 0 1589 3 0 3 3 0 8 1 amappl1 80 12817 0 12131 18 2 16 16 0 8 1 amappl 88 11113 0 10920 5 0 5 5 0 92 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 6 0 6 1 1 0 1 0 8 0 dma128 128 255 0 255 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 5 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1396 0 1363 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1396 0 1363 1 0 1 1 0 8 0 vmmpekpl 168 12709 0 12674 3 0 3 3 0 8 0 vmmpepl 168 91722 0 89459 113 12 101 101 0 357 2 vmsppl 488 1395 0 1363 6 1 5 5 0 8 0 rwobjpl 80 29254 0 23554 117 0 117 117 0 8 0 pdppl 4096 2800 0 2726 102 28 74 86 0 8 0 pvpl 32 17534 0 0 143 1 142 142 0 265 0 pmappl 256 1395 0 1363 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 361 0 46 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(fffffd806e10c9e8,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806e10c9d0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806e10c9d0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd805f67f038,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd805f67f038,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805f67f038,fffffd805f67f038,0,0,200,0,c599533d4629b75e) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805f67f038,fffffd805f67f038,ffff80003bc082b8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd805f372300,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff800010fe0ec8,ffff800039ff9128,ffff800039ff90d8,0,ffff800039ff9110,ffff800039ff929c,705d3e6a72d74ffa) at soreceive+0xc24 sys/kern/uipc_socket.c:1009 recvit(ffff80003bc082b8,4,ffff800039ff9270,0,ffff800039ff9320) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff80003bc082b8,ffff800039ff93d0,ffff800039ff9320) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff800039ff93d0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039ff93d0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbbe70e34620, 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