witness: lock order reversal: 1st 0xffff8000014c4130 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd806e120908 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(fffffd806e120908,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806e1208f0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806e1208f0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd806ac37628,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd806ac37628,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd806ac37628,fffffd8067c86a68,0,0,200,0,2a069e8e9222db40) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd806ac37628,fffffd8067c86a68,ffff80003c4e3cc0) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806ec3d900,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff8000014c4040,ffff80003c4db388,ffff80003c4db338,0,ffff80003c4db370,ffff80003c4db4fc,87d5848277b08312) at soreceive+0xc24 sys/kern/uipc_socket.c:1009 recvit(ffff80003c4e3cc0,4,ffff80003c4db4d0,0,ffff80003c4db580) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff80003c4e3cc0,ffff80003c4db630,ffff80003c4db580) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff80003c4db630) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4db630) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xadfa34666a0, count: -14 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c4dae20 rbx 0 rdx 0xffff80000147d400 rcx 0xffff80003c4e3cc0 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c4dad00 r9 0x8080808080808080 r10 0x3ba77c3652cb7a02 r11 0x52180897f132837a r12 0xfffffd8003eff640 r13 0xfffffd80046e78a0 r14 0x3 r15 0xffffffff833e2b64 substchar+0xf1da rip 0xffffffff831577a5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c4dae10 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=278981 pid=31237 tcnt=2 stat=onproc flags process=1000000 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c4e2568,0xffff80003c4e2810 process=0xffff80003c4c3048 user=0xffff80003c4d6000, vmspace=0xfffffd806b952020 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 65516 252884 80649 0 7 0 syz-executor 28510 169193 33787 0 2 0 syz-executor 69907 117774 25514 0 2 0 syz-executor 69907 53959 25514 0 3 0x4000080 fsleep syz-executor 31237 8279 30030 0 2 0x1000000 syz-executor *31237 278981 30030 0 7 0x5000000 syz-executor 74595 118549 99605 0 2 0 syz-executor 74595 327749 99605 0 3 0x4000080 fsleep syz-executor 74595 231251 99605 0 3 0x4000080 fsleep syz-executor 74595 131582 99605 0 3 0x4000080 fsleep syz-executor 97852 167197 79922 0 2 0 syz-executor 97852 358971 79922 0 3 0x4000080 fsleep syz-executor 60176 432842 88942 0 2 0 syz-executor 60176 119511 88942 0 3 0x4000080 fifor syz-executor 60176 296259 88942 0 3 0x4000080 fifor syz-executor 60176 227500 88942 0 2 0x4000000 syz-executor 60176 121546 88942 0 2 0x4000000 syz-executor 25064 47447 0 0 3 0x14280 nfsidl nfsio 20671 478512 0 0 3 0x14280 nfsidl nfsio 15975 322217 0 0 3 0x14280 nfsidl nfsio 49582 424363 0 0 3 0x14280 nfsidl nfsio 47740 172370 0 0 3 0x14280 nfsidl nfsio 92160 8964 0 0 3 0x14280 nfsidl nfsio 46493 196485 0 0 3 0x14280 nfsidl nfsio 44565 298689 0 0 3 0x14280 nfsidl nfsio 40703 423864 0 0 3 0x14280 nfsidl nfsio 11160 341905 0 0 3 0x14280 nfsidl nfsio 7301 204009 0 0 3 0x14280 nfsidl nfsio 66085 296384 0 0 3 0x14280 nfsidl nfsio 32380 294154 0 0 3 0x14280 nfsidl nfsio 84282 516549 0 0 3 0x14280 nfsidl nfsio 42455 328501 0 0 3 0x14280 nfsidl nfsio 50672 398582 0 0 3 0x14280 nfsidl nfsio 35531 398685 0 0 3 0x14280 nfsidl nfsio 49160 396717 0 0 3 0x14280 nfsidl nfsio 56263 31922 0 0 3 0x14280 nfsidl nfsio 34217 4713 0 0 3 0x14280 nfsidl nfsio 24774 498031 0 0 3 0x14200 bored sosplice 79922 85744 51669 0 3 0x82 nanoslp syz-executor 10661 150678 51669 0 2 0x2 syz-executor 99605 310326 51669 0 3 0x82 nanoslp syz-executor 88942 511061 51669 0 3 0x82 nanoslp syz-executor 30030 48580 51669 0 3 0x82 nanoslp syz-executor 80649 468499 51669 0 3 0x82 nanoslp syz-executor 25514 430525 51669 0 3 0x82 nanoslp syz-executor 33787 50890 51669 0 3 0x82 nanoslp syz-executor 51669 515353 47453 0 3 0x82 kqread syz-executor 47453 489194 43722 0 3 0x10008a sigsusp ksh 43722 7052 26385 0 3 0x98 kqread sshd-session 26385 284336 52494 0 3 0x92 kqread sshd-session 68240 84713 1 0 3 0x100083 ttyin getty 52494 150672 1 0 3 0x88 kqread sshd 81086 389652 10987 74 3 0x1100092 bpf pflogd 10987 478189 1 0 3 0x80 sbwait pflogd 64341 11573 42752 73 3 0x1100090 kqread syslogd 42752 178523 1 0 3 0x100082 sbwait syslogd 8536 284209 1 0 3 0x100080 kqread resolvd 81538 411469 57336 77 3 0x100092 kqread dhcpleased 27731 72055 57336 77 3 0x100092 kqread dhcpleased 57336 88540 1 0 3 0x80 kqread dhcpleased 54480 272158 0 0 3 0x14200 bored smr 44010 102692 0 0 2 0x14200 zerothread 60797 128818 0 0 3 0x14200 aiodoned aiodoned 37388 147161 0 0 3 0x14200 syncer update 99377 250799 0 0 3 0x14200 cleaner cleaner 58259 462198 0 0 3 0x14200 reaper reaper 75345 251822 0 0 3 0x14200 pgdaemon pagedaemon 21266 399678 0 0 3 0x14200 bored viomb 89102 390726 0 0 3 0x40014200 acpi0 acpi0 91572 444471 0 0 3 0x40014200 idle1 61724 98226 0 0 3 0x14200 bored softnet1 15007 119238 0 0 2 0x14200 softnet0 925 82389 0 0 3 0x14200 bored systqmp 60673 73387 0 0 3 0x14200 bored systq 11877 514471 0 0 3 0x14200 tmoslp softclockmp 76831 165857 0 0 3 0x40014200 tmoslp softclock 67299 181593 0 0 3 0x40014200 idle0 1 61060 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 65516 (syz-executor) thread 0xffff80003980a030 (252884) exclusive rwlock uobjlk r = 0 (0xfffffd806b8b4950) #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 uvm_fault+0x1e5 sys/uvm/uvm_fault.c:655 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #4 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806b952aa8) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1902 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:699 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:633 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 #7 recall_trap+0x8 Process 31237 (syz-executor) thread 0xffff80003c4e3cc0 (278981) 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 (0xffff8000014c4130) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10195 11149K 11323K 166960K 11640 0 pcb 18 13K 14K 166960K 100 0 rtable 163 5K 6K 166960K 300 0 pf 30 16K 81K 166960K 68 0 ifaddr 34 5K 7K 166960K 58 0 ifgroup 47 2K 2K 166960K 85 0 sysctl 3 1K 9K 166960K 8 0 counters 64 36K 38K 166960K 96 0 ioctlops 0 0K 4K 166960K 1508 0 iov 0 0K 16K 166960K 19 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1401 88K 89K 166960K 1644 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 7 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 236K 166960K 365 0 sigio 0 0K 0K 166960K 6 0 proc 72 115K 147K 166960K 554 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 2 0K 0K 166960K 26 0 in_multi 75 5K 7K 166960K 106 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 2 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 386 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 228 167K 176K 166960K 4849 0 UVM aobj 11 2K 2K 166960K 11 0 pinsyscall 42 84K 104K 166960K 1440 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 17 0 NDP 10 0K 2K 166960K 36 0 temp 45 8648K 8713K 166960K 18102 0 kqueue 13 20K 26K 166960K 60 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 54 0 51 1 0 1 1 0 8 0 rtentry 176 101 0 33 5 0 5 5 0 8 0 unpcb 144 196 0 175 4 0 4 4 0 8 3 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 185 0 181 6 2 4 6 0 8 3 arp 136 11 0 2 1 0 1 1 0 8 0 inpcb 328 473 0 463 7 0 7 7 0 8 6 nd6 152 16 0 4 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 10 0 10 1 0 1 1 0 8 1 pppxif 1504 3 0 3 1 0 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 7 0 4 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 pfqueue 320 1 0 1 1 0 1 1 0 8 1 pfstitem 24 21 0 1 1 0 1 1 0 8 0 pfstkey 128 21 0 1 1 0 1 1 0 8 0 pfstate 384 21 0 1 3 0 3 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 451 0 137 28 3 25 28 0 8 1 art_table 40 453 0 137 5 0 5 5 0 8 0 art_node 32 101 0 41 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 3 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 6 0 1 1 0 1 1 0 8 0 shmpl 112 8 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2019 0 511 96 0 96 96 0 8 0 ffsino 296 2019 0 511 117 0 117 117 0 8 0 nchpl 144 2486 0 798 64 0 64 64 0 8 1 rtmask 32 1 0 1 1 0 1 1 0 8 1 uvmvnodes 80 2271 0 0 47 0 47 47 0 8 0 vnodes 216 2271 0 0 127 0 127 127 0 8 0 namei 1024 8271 0 8271 2 1 1 2 0 8 1 percpumem 16 63 0 16 1 0 1 1 0 8 0 kstatmem 264 42 0 20 3 0 3 3 0 8 1 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 11159 0 11159 10 2 8 8 1 8 8 plimitpl 152 53 0 36 1 0 1 1 0 8 0 sigapl 424 672 0 604 8 0 8 8 0 8 0 knotepl 120 522 0 0 16 0 16 16 0 8 0 kqueuepl 224 94 0 84 2 0 2 2 0 8 1 pipepl 344 188 0 161 3 0 3 3 0 8 0 fdescpl 528 635 0 604 3 0 3 3 0 8 0 filepl 160 3465 0 3243 17 0 17 17 0 8 7 lockfpl 104 105 0 101 1 0 1 1 0 8 0 lockfspl 48 53 0 49 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 396 0 383 1 0 1 1 0 8 0 zombiepl 144 604 0 604 1 0 1 1 0 8 1 processpl 1232 672 0 604 6 0 6 6 0 8 0 procpl 664 1085 0 1007 8 0 8 8 0 8 0 sosppl 168 1 0 1 1 1 0 1 0 8 0 sockpl 752 795 0 761 11 0 11 11 0 8 7 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 111 0 0 14 0 14 14 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 151 0 0 10 0 10 10 0 8 0 bufpl 280 5695 0 124 398 0 398 398 0 8 0 anonpl 32 11043 0 0 89 0 89 89 0 246 0 amapchunkpl 152 15379 0 14932 29 1 28 28 0 158 6 amappl16 200 2882 0 2858 27 5 22 22 0 8 17 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 110 0 98 1 0 1 1 0 8 0 amappl13 176 5 0 5 2 1 1 1 0 8 1 amappl12 168 1283 0 1253 3 0 3 3 0 8 0 amappl11 160 78 0 63 1 0 1 1 0 8 0 amappl10 152 9 0 9 1 1 0 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 29 0 27 1 0 1 1 0 8 0 amappl7 128 106 0 93 1 0 1 1 0 8 0 amappl6 120 204 0 201 1 0 1 1 0 8 0 amappl5 112 134 0 125 1 0 1 1 0 8 0 amappl4 104 301 0 281 1 0 1 1 0 8 0 amappl3 96 2485 0 2397 3 0 3 3 0 8 0 amappl2 88 860 0 784 2 0 2 2 0 8 0 amappl1 80 9036 0 8435 15 1 14 15 0 8 1 amappl 88 4130 0 3976 5 0 5 5 0 92 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 128 253 0 253 1 1 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 10 0 0 1 0 1 1 0 8 0 uaddrrnd 24 635 0 604 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 635 0 604 1 0 1 1 0 8 0 vmmpekpl 168 6973 0 6937 3 0 3 3 0 8 1 vmmpepl 168 46675 0 44728 106 0 106 106 0 357 13 vmsppl 488 634 0 604 5 0 5 5 0 8 1 rwobjpl 80 17842 0 14647 73 0 73 73 0 8 4 pdppl 4096 1278 0 1208 100 28 72 86 0 8 2 pvpl 32 18893 0 0 155 2 153 153 0 265 0 pmappl 256 634 0 604 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 273 0 37 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff837efff0) 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(ffffffff83915db8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83915db8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80003c435990,ffff800000069c00) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x4f sys/dev/kcov.c:159 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83915db8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83915db8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 uvm_fault(fffffd806b9529a8,c73d3525000,0,2) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:656 upageflttrap(ffff80003c435ec0,c73d3525000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c435ec0) at usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7a5f6c131e60, count: -15 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(fffffd806e120908,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806e1208f0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806e1208f0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd806ac37628,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd806ac37628,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd806ac37628,fffffd8067c86a68,0,0,200,0,2a069e8e9222db40) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd806ac37628,fffffd8067c86a68,ffff80003c4e3cc0) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd806ec3d900,33,0) at unp_externalize+0x26f sys/kern/uipc_usrreq.c:1090 soreceive(ffff8000014c4040,ffff80003c4db388,ffff80003c4db338,0,ffff80003c4db370,ffff80003c4db4fc,87d5848277b08312) at soreceive+0xc24 sys/kern/uipc_socket.c:1009 recvit(ffff80003c4e3cc0,4,ffff80003c4db4d0,0,ffff80003c4db580) at recvit+0x40b sys/kern/uipc_syscalls.c:1078 sys_recvmsg(ffff80003c4e3cc0,ffff80003c4db630,ffff80003c4db580) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 syscall(ffff80003c4db630) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4db630) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xadfa34666a0, count: -14