witness: lock order reversal: 1st 0xffff80000130e9f8 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd806b0ff0a0 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83161d3f -> 0xffffffff830d64b2 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(fffffd806b0ff0a0,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806b0ff088,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806b0ff088,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd805eb538d0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805eb538d0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805eb538d0,fffffd805eb53d08,0,0,200,0,bff34092b94f978f) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805eb538d0,fffffd805eb53d08,ffff8000ffff6a48) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806ad4b600,101,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff80000130e918,ffff80003c5b24f8,ffff80003c5b24a8,0,ffff80003c5b24e8,ffff80003c5b266c,70b27259ef78a620) at soreceive+0xc73 sys/kern/uipc_socket.c:1015 recvit(ffff8000ffff6a48,5,ffff80003c5b2640,0,ffff80003c5b2630) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmmsg(ffff8000ffff6a48,ffff80003c5b2800,ffff80003c5b2750) at sys_recvmmsg+0x3d3 sys/kern/uipc_syscalls.c:963 syscall(ffff80003c5b2800) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5b2800) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x418f1153db0, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c5b1f80 rbx 0xfffffd800433be88 rdx 0xffff8000012fb540 rcx 0xffff8000ffff6a48 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c5b1e60 r9 0x8080808080808080 r10 0x2ac9ccb258fa64bc r11 0xab97cdbb7b8aeee2 r12 0 r13 0xfffffd8003b53f00 r14 0x3 r15 0xffffffff rip 0xffffffff8239cdf5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c5b1f70 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=192135 pid=82911 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=0xffff8000ffff62b0,0xffff8000ffff7988 process=0xffff80003957f910 user=0xffff80003c5ad000, vmspace=0xfffffd806bfb9738 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49958 103013 11739 0 2 0 syz-executor 82911 33766 42067 0 2 0x1000000 syz-executor *82911 192135 42067 0 7 0x5000000 syz-executor 82911 26536 42067 0 2 0x5000000 syz-executor 24983 204175 1894 0 2 0 syz-executor 24983 27037 1894 0 3 0x4000080 nanoslp syz-executor 24983 233500 1894 0 3 0x4000000 smrbar syz-executor 12481 132311 4375 0 3 0x80 nanoslp syz-executor 12481 312281 4375 0 3 0x4000080 kqsel syz-executor 12481 152412 4375 0 3 0x4000080 fsleep syz-executor 85715 273358 31984 0 3 0x90 nanoslp syz-executor 85715 243547 31984 0 3 0x4000090 ttyin syz-executor 85715 503277 31984 0 3 0x4000090 fsleep syz-executor 85715 108891 31984 0 3 0x4000090 fsleep syz-executor 92788 415021 0 0 3 0x14200 acct acct 68201 2649 1 0 3 0x80 nanoslp init 42067 25261 244 0 3 0x82 nanoslp syz-executor 52038 270351 0 0 3 0x14200 bored sosplice 1894 179407 244 0 3 0x82 nanoslp syz-executor 11739 227636 244 0 3 0x82 nanoslp syz-executor 15122 519554 244 0 3 0x2 biowait syz-executor 4375 467541 244 0 3 0x82 nanoslp syz-executor 69963 70409 244 0 3 0x82 wait syz-executor 31984 166621 244 0 3 0x82 nanoslp syz-executor 73828 399570 244 0 3 0x82 wait syz-executor 244 334836 64922 0 3 0x82 kqread syz-executor 64922 42662 46198 0 3 0x10008a sigsusp ksh 46198 385211 47624 0 3 0x98 kqread sshd-session 47624 169820 8808 0 3 0x92 kqread sshd-session 8808 370571 1 0 3 0x88 kqread sshd 28522 433396 1866 74 3 0x1100092 bpf pflogd 1866 352722 1 0 3 0x80 sbwait pflogd 73949 38825 22520 73 3 0x1100090 kqread syslogd 22520 59609 1 0 3 0x100082 sbwait syslogd 54838 209265 1 0 3 0x100080 kqread resolvd 29969 332661 72009 77 3 0x100092 kqread dhcpleased 47160 360261 72009 77 3 0x100092 kqread dhcpleased 72009 158107 1 0 3 0x80 kqread dhcpleased 51701 83522 0 0 3 0x14200 bored smr 24074 328677 0 0 2 0x14200 zerothread 30010 494737 0 0 3 0x14200 aiodoned aiodoned 35329 188449 0 0 3 0x14200 syncer update 24651 216819 0 0 3 0x14200 cleaner cleaner 27935 272319 0 0 3 0x14200 reaper reaper 31014 460534 0 0 3 0x14200 pgdaemon pagedaemon 93987 32011 0 0 3 0x14200 bored viomb 8695 282439 0 0 3 0x40014200 acpi0 acpi0 94032 177364 0 0 7 0x40014200 idle1 78640 53229 0 0 3 0x14200 bored softnet3 20415 236318 0 0 3 0x14200 bored softnet2 89396 99929 0 0 3 0x14200 bored softnet1 34966 490414 0 0 3 0x14200 bored softnet0 26956 266183 0 0 3 0x14200 bored systqmp 7943 360829 0 0 3 0x14200 bored systq 9812 523937 0 0 3 0x14200 tmoslp softclockmp 36045 153543 0 0 3 0x40014200 tmoslp softclock 12267 402148 0 0 3 0x40014200 idle0 1 445544 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 82911 (syz-executor) thread 0xffff8000ffff6a48 (192135) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff836710f8) #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_recvmmsg+0x3d3 sys/kern/uipc_syscalls.c:963 #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 (0xffff80000130e9f8) #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_recvmmsg+0x3d3 sys/kern/uipc_syscalls.c:963 #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 24983 (syz-executor) thread 0xffff8000ffff7c00 (233500) exclusive rwlock clonelk r = 0 (0xffffffff834c6f28) #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 if_clone_destroy+0x67 #3 tun_dev_close+0x1dc sys/net/if_tun.c:529 #4 spec_close+0x412 #5 VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 #6 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #6 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #7 fdrop+0x126 sys/kern/kern_descrip.c:1265 #8 closef+0x192 sys/kern/kern_descrip.c:1249 #9 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #10 Xsyscall+0x128 Process 15122 (syz-executor) thread 0xffff8000ffff9460 (519554) exclusive rrwlock inode r = 0 (0xfffffd806e005a88) #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 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3102 #10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c3ff538) #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 domkdirat+0x8b sys/kern/vfs_syscalls.c:3087 #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 10213 11049K 11435K 166960K 13928 0 pcb 18 24K 34K 166960K 710 0 rtable 142 6K 8K 166960K 616 0 pf 39 18K 22K 166960K 161 0 ifaddr 33 5K 7K 166960K 94 0 ifgroup 60 2K 2K 166960K 171 0 sysctl 4 1K 2K 166960K 8 0 counters 66 36K 37K 166960K 138 0 ioctlops 0 0K 4K 166960K 1753 0 iov 0 0K 28K 166960K 147 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1450 91K 91K 166960K 2974 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 37 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 295 0 dirhash 12 2K 2K 166960K 42 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 85K 166960K 1857 0 sigio 0 0K 0K 166960K 37 0 proc 63 79K 128K 166960K 787 0 subproc 72 4K 4K 166960K 83 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 364 0 in_multi 42 3K 7K 166960K 149 0 ether_multi 1 0K 0K 166960K 9 0 mrt 1 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 121 546K 546K 166960K 121 0 exec 0 0K 1K 166960K 781 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 237 73K 87K 166960K 18934 0 UVM aobj 25 2K 4K 166960K 30 0 pinsyscall 41 82K 100K 166960K 3100 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 92 0 NDP 13 0K 1K 166960K 68 0 temp 76 6900K 7028K 166960K 81757 0 kqueue 13 20K 30K 166960K 327 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 120 343 0 340 7 4 3 3 0 8 2 rtentry 112 160 0 104 4 0 4 4 0 8 0 unpcb 144 1549 0 1530 16 14 2 6 0 8 1 syncache 336 23 0 23 5 4 1 1 0 8 1 tcpqe 32 6 0 6 3 2 1 1 0 8 1 tcpcb 808 776 0 765 27 24 3 11 0 8 1 arp 120 28 0 10 1 0 1 1 0 8 0 inpcb 376 2974 0 2956 57 47 10 21 0 8 7 nd6 136 34 0 27 1 0 1 1 0 8 0 pkpcb 40 11 0 11 3 2 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1168 23 0 23 5 4 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 13 0 6 1 0 1 1 0 482 0 pffrnode 88 11 0 5 1 0 1 1 0 8 0 pffrent 40 67 0 60 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 2 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 150 0 56 1 0 1 1 0 8 0 pfstkey 128 156 0 62 4 0 4 4 0 8 0 pfstate 376 154 0 60 10 0 10 10 0 8 0 pfrule 1344 34 0 24 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 614 0 401 30 4 26 29 0 8 2 art_table 32 617 0 401 4 0 4 4 0 8 0 art_node 16 153 0 103 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semapl 112 293 0 283 1 0 1 1 0 8 0 shmpl 112 27 0 5 1 0 1 1 0 8 0 dirhash 1024 37 0 20 3 0 3 3 0 8 0 dino2pl 256 4827 0 3328 95 0 95 95 0 8 0 ffsino 280 4827 0 3328 109 0 109 109 0 8 0 nchpl 144 7550 0 5856 64 0 64 64 0 8 0 uvmvnodes 80 5853 0 0 120 0 120 120 0 8 0 vnodes 216 5853 0 0 326 0 326 326 0 8 0 namei 1024 27823 0 27822 3 2 1 1 0 8 0 percpumem 16 83 0 36 1 0 1 1 0 8 0 kstatmem 264 98 0 72 3 1 2 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 11 0 11 3 2 1 1 0 8 1 scxspl 216 26173 0 26172 12 11 1 8 1 8 0 plimitpl 152 506 0 487 1 0 1 1 0 8 0 sigapl 424 2211 0 2160 10 3 7 9 0 8 0 futexpl 64 27919 0 27916 1 0 1 1 0 8 0 knotepl 120 575 0 0 17 0 17 17 0 8 0 kqueuepl 216 705 0 695 14 9 5 5 0 8 3 pipepl 328 448 0 421 13 5 8 8 0 8 5 fdescpl 504 2168 0 2137 5 0 5 5 0 8 0 filepl 152 16837 0 16609 37 18 19 19 0 8 7 lockfpl 104 695 0 692 2 1 1 2 0 8 0 lockfspl 48 252 0 249 1 0 1 1 0 8 0 sessionpl 144 43 0 35 1 0 1 1 0 8 0 pgrppl 48 74 0 58 1 0 1 1 0 8 0 ucredpl 104 2685 0 2670 1 0 1 1 0 8 0 zombiepl 144 2162 0 2160 2 1 1 1 0 8 0 processpl 1168 2211 0 2160 6 2 4 6 0 8 0 procpl 648 4906 0 4846 9 2 7 8 0 8 1 srpgc 96 6 0 6 3 2 1 1 0 8 1 sosppl 168 12 0 12 6 5 1 1 0 8 1 sockpl 688 4943 0 4904 71 58 13 25 0 8 7 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mtagpl 96 20 0 0 1 0 1 1 0 8 0 mbufpl 256 506 0 0 28 0 28 28 0 8 0 bufpl 280 9343 0 3177 441 0 441 441 0 8 0 anonpl 24 321755 0 313211 152 74 78 78 0 185 0 amapchunkpl 152 62028 0 61426 51 19 32 34 0 158 6 amappl16 200 7584 0 7316 96 70 26 28 0 8 0 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 185 0 174 1 0 1 1 0 8 0 amappl13 176 30 0 30 2 1 1 1 0 8 1 amappl12 168 2862 0 2832 3 1 2 2 0 8 0 amappl11 160 50 0 35 1 0 1 1 0 8 0 amappl10 152 32 0 32 2 2 0 1 0 8 0 amappl9 144 322 0 321 1 0 1 1 0 8 0 amappl8 136 28 0 24 1 0 1 1 0 8 0 amappl7 128 131 0 119 1 0 1 1 0 8 0 amappl6 120 207 0 203 1 0 1 1 0 8 0 amappl5 112 127 0 116 1 0 1 1 0 8 0 amappl4 104 404 0 385 1 0 1 1 0 8 0 amappl3 96 12822 0 12705 5 1 4 4 0 8 0 amappl2 88 860 0 798 2 0 2 2 0 8 0 amappl1 80 17799 0 17254 16 2 14 16 0 8 0 amappl 88 18287 0 18104 5 0 5 5 0 92 0 dma32768 32768 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 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 257 0 257 4 3 1 1 0 8 1 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 1 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 29 0 5 1 0 1 1 0 8 0 uaddrrnd 24 2168 0 2137 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2168 0 2137 1 0 1 1 0 8 0 vmmpekpl 168 20020 0 19972 3 0 3 3 0 8 0 vmmpepl 168 141369 0 139280 139 29 110 110 0 357 1 vmsppl 456 2167 0 2137 5 0 5 5 0 8 0 rwobjpl 64 45780 0 38749 117 3 114 114 0 8 0 pdppl 4096 4343 0 4274 121 50 71 81 0 8 2 pvpl 32 20487 0 0 165 0 165 165 0 265 0 pmappl 248 2167 0 2137 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 357 0 94 8 0 8 8 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(fffffd806b0ff0a0,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806b0ff088,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806b0ff088,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd805eb538d0,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805eb538d0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805eb538d0,fffffd805eb53d08,0,0,200,0,bff34092b94f978f) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805eb538d0,fffffd805eb53d08,ffff8000ffff6a48) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806ad4b600,101,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff80000130e918,ffff80003c5b24f8,ffff80003c5b24a8,0,ffff80003c5b24e8,ffff80003c5b266c,70b27259ef78a620) at soreceive+0xc73 sys/kern/uipc_socket.c:1015 recvit(ffff8000ffff6a48,5,ffff80003c5b2640,0,ffff80003c5b2630) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmmsg(ffff8000ffff6a48,ffff80003c5b2800,ffff80003c5b2750) at sys_recvmmsg+0x3d3 sys/kern/uipc_syscalls.c:963 syscall(ffff80003c5b2800) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5b2800) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x418f1153db0, 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 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffff800029b5bff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5