witness: lock order reversal: 1st 0xffff800001334f38 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd806df711c8 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff831566ce -> 0xffffffff830cf67f is missing lock order [2] inode (&ip->i_lock) -> [1] sbufrcv (&so->so_rcv.sb_lock) #0 rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 #1 sblock+0xb7 sys/kern/uipc_socket2.c:537 #2 soreceive+0x28e sys/kern/uipc_socket.c:876 #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+0xf8 sys/kern/vfs_vnops.c:531 #10 sys_ioctl+0x5c3 #11 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #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:437 witness_checkorder(fffffd806df711c8,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806df711b0,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806df711b0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8067394798,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8067394798,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd8067394798,fffffd8067394870,0,0,200,0,75683f2e51af7d1) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd8067394798,fffffd8067394870,ffff8000ffffaf40) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd8075b38800,ec,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff800001334e58,ffff80003c603b98,ffff80003c603b48,0,ffff80003c603b88,ffff80003c603d0c,1a96ebfb85558e11) at soreceive+0xc73 sys/kern/uipc_socket.c:1015 recvit(ffff8000ffffaf40,5,ffff80003c603ce0,0,ffff80003c603d90) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff8000ffffaf40,ffff80003c603e40,ffff80003c603d90) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80003c603e40) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c603e40) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d241ffa6d0, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c603620 rbx 0xfffffd80043403c8 rdx 0xffff8000012d7cc0 rcx 0xffff8000ffffaf40 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c603500 r9 0x8080808080808080 r10 0x3a7f555b78a8237b r11 0x714b6f86b94821b5 r12 0 r13 0xfffffd8003b56f00 r14 0x3 r15 0xffffffff rip 0xffffffff82a6fbd5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c603610 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=141771 pid=82554 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=0xffff8000ffffa7a8,0xffff80002a41f6f0 process=0xffff80002a3c6238 user=0xffff80003c5fe000, vmspace=0xfffffd806bd9cad0 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 76013 13113 76784 0 2 0x100002 sh 49538 505645 72848 0 2 0 syz-executor 49538 395504 72848 0 2 0x4000000 syz-executor 82554 31499 86129 0 2 0x1000000 syz-executor *82554 141771 86129 0 7 0x5000000 syz-executor 82554 182656 86129 0 2 0x5000000 syz-executor 27329 241799 26978 0 2 0 syz-executor 27329 261451 26978 0 3 0x4000080 fsleep syz-executor 27329 116435 26978 0 3 0x4000080 fsleep syz-executor 27329 149457 26978 0 3 0x4000080 fsleep syz-executor 29027 309422 14245 0 2 0 syz-executor 29027 203034 14245 0 3 0x4000080 fsleep syz-executor 29027 469843 14245 0 3 0x4000080 fsleep syz-executor 86709 291751 43657 0 2 0 syz-executor 86709 39982 43657 0 3 0x4000080 fsleep syz-executor 89034 337810 94600 0 2 0 syz-executor 89034 421024 94600 0 3 0x4000080 fsleep syz-executor 89034 215873 94600 0 3 0x4000080 fsleep syz-executor 76784 225802 35385 0 3 0x82 wait syz-executor 14245 276561 35385 0 3 0x82 nanoslp syz-executor 26978 402397 35385 0 3 0x82 nanoslp syz-executor 40784 448770 35385 0 7 0x2 syz-executor 72848 249897 35385 0 3 0x82 nanoslp syz-executor 94600 2217 35385 0 3 0x82 nanoslp syz-executor 86129 414979 35385 0 3 0x82 nanoslp syz-executor 70489 170179 0 0 3 0x14200 bored sosplice 43657 389315 35385 0 3 0x82 nanoslp syz-executor 35385 279884 44772 0 3 0x82 kqread syz-executor 44772 289638 54451 0 3 0x10008a sigsusp ksh 54451 432210 7959 0 3 0x98 kqread sshd-session 7959 47570 75058 0 3 0x92 kqread sshd-session 93997 177664 1 0 3 0x100083 ttyin getty 75058 79096 1 0 3 0x88 kqread sshd 4720 271096 83747 74 3 0x1100092 bpf pflogd 83747 350211 1 0 3 0x80 sbwait pflogd 73652 130159 92057 73 3 0x1100090 kqread syslogd 92057 211737 1 0 3 0x100082 sbwait syslogd 73405 418351 1 0 3 0x100080 kqread resolvd 42008 73402 13804 77 3 0x100092 kqread dhcpleased 38754 422102 13804 77 3 0x100092 kqread dhcpleased 13804 125213 1 0 3 0x80 kqread dhcpleased 12894 144420 0 0 3 0x14200 bored smr 52861 124700 0 0 2 0x14200 zerothread 59677 15024 0 0 3 0x14200 aiodoned aiodoned 20303 380760 0 0 3 0x14200 syncer update 32338 209412 0 0 3 0x14200 cleaner cleaner 69158 274993 0 0 3 0x14200 reaper reaper 64469 261254 0 0 3 0x14200 pgdaemon pagedaemon 11682 90031 0 0 3 0x14200 bored viomb 5086 244136 0 0 3 0x40014200 acpi0 acpi0 80003 66194 0 0 3 0x40014200 idle1 74458 155013 0 0 3 0x14200 bored softnet3 82739 147675 0 0 3 0x14200 bored softnet2 91116 142056 0 0 3 0x14200 bored softnet1 49992 472596 0 0 3 0x14200 bored softnet0 15942 404612 0 0 3 0x14200 bored systqmp 27532 202017 0 0 3 0x14200 bored systq 34940 57765 0 0 3 0x14200 tmoslp softclockmp 58820 395760 0 0 3 0x40014200 tmoslp softclock 62335 225357 0 0 3 0x40014200 idle0 1 148074 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 82554 (syz-executor) thread 0xffff8000ffffaf40 (141771) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8360db10) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 unp_externalize+0x14e #2 soreceive+0xc73 sys/kern/uipc_socket.c:1015 #3 recvit+0x40a sys/kern/uipc_syscalls.c:1072 #4 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #6 Xsyscall+0x128 exclusive rwlock sbufrcv r = 0 (0xffff800001334f38) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 sblock+0xb7 sys/kern/uipc_socket2.c:537 #3 soreceive+0x28e sys/kern/uipc_socket.c:876 #4 recvit+0x40a sys/kern/uipc_syscalls.c:1072 #5 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 40784 (syz-executor) thread 0xffff80002a41d1d8 (448770) exclusive rrwlock inode r = 0 (0xfffffd80741852f8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2bd sys/kern/vfs_subr.c:694 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1851 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8071d282d0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1851 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10203 11055K 11469K 166960K 14298 0 pcb 18 16K 18K 166960K 442 0 rtable 232 7K 7K 166960K 1324 0 pf 34 17K 20K 166960K 161 0 ifaddr 42 7K 8K 166960K 182 0 ifgroup 55 2K 2K 166960K 230 0 sysctl 4 1K 2K 166960K 5 0 counters 64 36K 36K 166960K 160 0 ioctlops 0 0K 4K 166960K 1674 0 iov 0 0K 16K 166960K 153 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1456 92K 92K 166960K 3226 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 29 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 57 0 dirhash 15 2K 3K 166960K 51 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 93K 166960K 2040 0 sigio 0 0K 0K 166960K 26 0 proc 73 91K 140K 166960K 1404 0 subproc 72 4K 4K 166960K 307 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 341 0 in_multi 98 7K 7K 166960K 461 0 ether_multi 1 0K 0K 166960K 14 0 mrt 1 0K 0K 166960K 6 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 901 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 234 73K 87K 166960K 19125 0 UVM aobj 55 6K 6K 166960K 62 0 pinsyscall 42 84K 102K 166960K 3796 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 115 0 NDP 14 0K 2K 166960K 134 0 temp 79 6900K 7151K 166960K 60955 0 kqueue 16 26K 33K 166960K 291 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 284 0 281 4 3 1 3 0 8 0 rtentry 112 425 0 319 5 1 4 4 0 8 0 unpcb 144 1045 0 1024 7 6 1 4 0 8 0 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 808 534 0 528 8 7 1 5 0 8 0 arp 120 72 0 53 1 0 1 1 0 8 0 inpcb 376 1992 0 1978 24 16 8 9 0 8 6 nd6 136 114 0 84 2 0 2 2 0 8 0 pkpcb 40 11 0 11 5 4 1 1 0 8 1 kcovpl 48 34 0 26 1 0 1 1 0 8 0 ppxss 1168 13 0 13 4 3 1 1 0 8 1 pffrag 232 7 0 3 1 0 1 1 0 482 0 pffrnode 88 7 0 3 1 0 1 1 0 8 0 pffrent 40 45 0 41 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 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 125 0 58 1 0 1 1 0 8 0 pfstkey 128 125 0 58 3 0 3 3 0 8 0 pfstate 376 125 0 58 8 0 8 8 0 8 0 pfrule 1344 28 0 23 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 1888 0 1345 48 12 36 36 0 8 2 art_table 32 1891 0 1345 6 1 5 5 0 8 0 art_node 16 423 0 326 1 0 1 1 0 8 0 sysvmsgpl 40 29 0 22 2 1 1 1 0 8 0 semapl 112 51 0 41 1 0 1 1 0 8 0 shmpl 112 59 0 7 2 0 2 2 0 8 0 dirhash 1024 44 0 25 3 0 3 3 0 8 0 dino2pl 256 4500 0 2950 98 0 98 98 0 8 0 ffsino 280 4500 0 2950 111 0 111 111 0 8 0 nchpl 144 6919 0 5151 66 0 66 66 0 8 0 uvmvnodes 80 5865 0 0 120 0 120 120 0 8 0 vnodes 216 5865 0 0 326 0 326 326 0 8 0 namei 1024 27115 0 27115 2 1 1 1 0 8 1 percpumem 16 94 0 48 1 0 1 1 0 8 0 kstatmem 264 120 0 96 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 7 0 7 4 4 0 1 0 8 0 scxspl 216 19922 0 19922 9 8 1 7 1 8 1 plimitpl 152 522 0 503 1 0 1 1 0 8 0 sigapl 424 2292 0 2242 7 1 6 7 0 8 0 futexpl 64 24520 0 24512 1 0 1 1 0 8 0 knotepl 120 548 0 0 17 0 17 17 0 8 0 kqueuepl 216 459 0 447 3 2 1 2 0 8 0 pipepl 328 359 0 331 3 0 3 3 0 8 0 fdescpl 504 2269 0 2238 5 0 5 5 0 8 0 filepl 152 14090 0 13862 23 11 12 16 0 8 1 lockfpl 104 753 0 750 2 1 1 2 0 8 0 lockfspl 48 218 0 215 1 0 1 1 0 8 0 sessionpl 144 49 0 40 1 0 1 1 0 8 0 pgrppl 48 105 0 88 1 0 1 1 0 8 0 ucredpl 104 2887 0 2874 1 0 1 1 0 8 0 zombiepl 144 2242 0 2242 1 0 1 1 0 8 1 processpl 1168 2292 0 2242 5 1 4 5 0 8 0 procpl 648 4897 0 4836 6 0 6 6 0 8 0 srpgc 96 20 0 20 4 4 0 1 0 8 0 sosppl 168 14 0 14 5 5 0 1 0 8 0 sockpl 688 3354 0 3317 31 22 9 10 0 8 5 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 131 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 32 0 0 1 0 1 1 0 8 0 mbufpl 256 1175 0 0 73 0 73 73 0 8 0 bufpl 280 7325 0 1159 441 0 441 441 0 8 0 anonpl 24 269809 0 265552 75 24 51 53 0 185 14 amapchunkpl 152 60698 0 60133 44 20 24 33 0 158 0 amappl16 200 4807 0 4774 38 24 14 15 0 8 8 amappl15 192 5 0 4 1 0 1 1 0 8 0 amappl14 184 165 0 153 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 3328 0 3296 3 1 2 2 0 8 0 amappl11 160 56 0 42 1 0 1 1 0 8 0 amappl10 152 6 0 5 2 1 1 1 0 8 0 amappl9 144 249 0 249 1 1 0 1 0 8 0 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 156 0 143 1 0 1 1 0 8 0 amappl6 120 443 0 438 1 0 1 1 0 8 0 amappl5 112 230 0 220 1 0 1 1 0 8 0 amappl4 104 390 0 371 1 0 1 1 0 8 0 amappl3 96 12431 0 12313 4 0 4 4 0 8 0 amappl2 88 1017 0 952 2 0 2 2 0 8 0 amappl1 80 15273 0 14694 15 1 14 14 0 8 0 amappl 88 18455 0 18276 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 128 254 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 61 0 7 1 0 1 1 0 8 0 uaddrrnd 24 2269 0 2238 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2269 0 2238 1 0 1 1 0 8 0 vmmpekpl 168 16861 0 16797 4 0 4 4 0 8 0 vmmpepl 168 140930 0 139062 116 21 95 100 0 357 10 vmsppl 456 2268 0 2238 6 1 5 5 0 8 0 rwobjpl 64 42581 0 35693 112 0 112 112 0 8 0 pdppl 4096 4545 0 4476 133 60 73 85 0 8 4 pvpl 32 16911 0 0 136 0 136 136 0 265 0 pmappl 248 2268 0 2238 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 411 0 89 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:437 witness_checkorder(fffffd806df711c8,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806df711b0,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806df711b0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd8067394798,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8067394798,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd8067394798,fffffd8067394870,0,0,200,0,75683f2e51af7d1) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd8067394798,fffffd8067394870,ffff8000ffffaf40) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd8075b38800,ec,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff800001334e58,ffff80003c603b98,ffff80003c603b48,0,ffff80003c603b88,ffff80003c603d0c,1a96ebfb85558e11) at soreceive+0xc73 sys/kern/uipc_socket.c:1015 recvit(ffff8000ffffaf40,5,ffff80003c603ce0,0,ffff80003c603d90) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff8000ffffaf40,ffff80003c603e40,ffff80003c603d90) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80003c603e40) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c603e40) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d241ffa6d0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b5bff0) 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 __mp_lock(ffffffff8360d908) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8360d908) at __mp_lock+0x192 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff8360d908,1) at __mp_acquire_count+0x58 mi_switch() at mi_switch+0x4b7 sys/kern/sched_bsd.c:441 sleep_finish(0,1) at sleep_finish+0x24f sys/kern/kern_synch.c:414 biowait(fffffd80775939f8) at biowait+0xc1 sys/kern/vfs_bio.c:1246 bwrite(fffffd80775939f8) at bwrite+0x2e5 sys/kern/vfs_bio.c:758 ufs_dirremove(fffffd8077500dc0,fffffd8074185258,800c,1) at ufs_dirremove+0x2ac sys/ufs/ufs/ufs_lookup.c:919 ufs_rmdir(ffff80002a4a5e08) at ufs_rmdir+0x287 sys/ufs/ufs/ufs_vnops.c:1248 VOP_RMDIR(fffffd8077500dc0,fffffd807564f8c0,ffff80002a4a5ee8) at VOP_RMDIR+0x19a sys/kern/vfs_vops.c:413 dounlinkat(ffff80002a41d1d8,ffffff9c,739abbfc0fc0,8) at dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1884 syscall(ffff80002a4a6060) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a4a6060) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x739abbfc0fb0, count: -15