witness: lock order reversal: 1st 0xffff800010fd2c98 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd806e641a88 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff834385bd -> 0xffffffff833a5512 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:536 #2 soreceive+0x28e sys/kern/uipc_socket.c:882 #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{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(fffffd806e641a88,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806e641a70,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806e641a70,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd805f747460,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805f747460,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805f747460,fffffd805f747898,0,0,200,0,9edc4182c04341d9) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805f747460,fffffd805f747898,ffff80003c5b8038) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd805ed2b900,33,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff800010fd2bb8,ffff80003c4e4128,ffff80003c4e40d8,0,ffff80003c4e4118,ffff80003c4e429c,de26b5e3d13d6862) at soreceive+0xc73 sys/kern/uipc_socket.c:1021 recvit(ffff80003c5b8038,6,ffff80003c4e4270,0,ffff80003c4e4320) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff80003c5b8038,ffff80003c4e43d0,ffff80003c4e4320) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80003c4e43d0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4e43d0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f4167cedf0, count: -14 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c4e3bb0 rbx 0xfffffd800470c4f8 rdx 0xffff80000142abc0 rcx 0xffff80003c5b8038 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c4e3a90 r9 0x8080808080808080 r10 0x9751bc5211ac0b1 r11 0x66a4d9060a9c596a r12 0 r13 0xfffffd8003f24f00 r14 0x3 r15 0xffffffff rip 0xffffffff810240e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c4e3ba0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=453878 pid=78755 tcnt=2 stat=onproc flags process=1000000 proc=4000000 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c5b8558,0xffff80003c5b94c8 process=0xffff80003c56a050 user=0xffff80003c4df000, vmspace=0xfffffd806beac570 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 70774 157388 95710 0 7 0 syz-executor 70774 265207 95710 0 3 0x4000080 fsleep syz-executor 78755 268421 98014 0 3 0x1000080 fsleep syz-executor *78755 453878 98014 0 7 0x5000000 syz-executor 44722 191157 6073 0 3 0x80 fsleep syz-executor 44722 18138 6073 0 2 0x4000000 syz-executor 68126 152915 33430 0 3 0x80 fsleep syz-executor 68126 334210 33430 0 3 0x4000080 kqpoll syz-executor 68126 435299 33430 0 3 0x4000080 fsleep syz-executor 39330 466012 25821 0 3 0x80 fsleep syz-executor 39330 149221 25821 0 3 0x4000080 nanoslp syz-executor 39330 13164 25821 0 3 0x4000080 fsleep syz-executor 46142 80616 28324 0 3 0x80 fsleep syz-executor 46142 73451 28324 0 3 0x4000080 fifor syz-executor 11722 178012 86178 0 3 0x80 fsleep syz-executor 11722 233570 86178 0 3 0x4000080 piperd syz-executor 65944 363429 28398 0 3 0x80 fsleep syz-executor 65944 52717 28398 0 3 0x4000080 sbwait syz-executor 13485 230399 1 0 3 0x100083 ttyin getty 28324 418727 17943 0 3 0x82 nanoslp syz-executor 28398 60644 17943 0 3 0x82 nanoslp syz-executor 47057 442535 51567 0 3 0x82 sbwait sshd-session 69163 227680 0 0 3 0x14280 nfsidl nfsio 57128 496150 0 0 3 0x14280 nfsidl nfsio 50060 337688 0 0 3 0x14280 nfsidl nfsio 24797 434173 0 0 3 0x14280 nfsidl nfsio 64373 471988 0 0 3 0x14280 nfsidl nfsio 28010 220545 0 0 3 0x14280 nfsidl nfsio 58767 514525 0 0 3 0x14280 nfsidl nfsio 94173 154034 0 0 3 0x14280 nfsidl nfsio 28377 101355 0 0 3 0x14280 nfsidl nfsio 49748 214254 0 0 3 0x14280 nfsidl nfsio 41357 172960 0 0 3 0x14280 nfsidl nfsio 2863 415624 0 0 3 0x14280 nfsidl nfsio 54462 49656 0 0 3 0x14280 nfsidl nfsio 7500 385037 0 0 3 0x14280 nfsidl nfsio 29202 521450 0 0 3 0x14280 nfsidl nfsio 21078 398315 0 0 3 0x14280 nfsidl nfsio 59310 389744 0 0 3 0x14280 nfsidl nfsio 80680 343184 0 0 3 0x14280 nfsidl nfsio 53522 274054 0 0 3 0x14280 nfsidl nfsio 2578 182047 0 0 3 0x14280 nfsidl nfsio 80735 324239 0 0 3 0x14200 bored sosplice 45359 279289 79210 0 3 0x100082 sbwait arp 79210 52531 1 0 3 0x10008a sigsusp sh 25821 25094 17943 0 3 0x82 nanoslp syz-executor 6073 16189 17943 0 3 0x82 nanoslp syz-executor 95710 480648 17943 0 3 0x82 nanoslp syz-executor 33430 437710 17943 0 3 0x82 nanoslp syz-executor 86178 133216 17943 0 3 0x82 nanoslp syz-executor 98014 142541 17943 0 3 0x82 nanoslp syz-executor 17943 61665 66797 0 3 0x82 kqread syz-executor 66797 450676 36345 0 3 0x10008a sigsusp ksh 36345 430883 49492 0 3 0x98 kqread sshd-session 49492 408777 51567 0 3 0x92 kqread sshd-session 51567 58141 1 0 3 0x88 kqread sshd 16988 104508 51673 74 3 0x1100092 bpf pflogd 51673 482236 1 0 3 0x80 sbwait pflogd 88367 265631 28376 73 3 0x1100090 kqread syslogd 28376 459970 1 0 3 0x100082 sbwait syslogd 98956 480462 1 0 3 0x100080 kqread resolvd 8605 14272 70510 77 3 0x100092 kqread dhcpleased 35018 219544 70510 77 3 0x100092 kqread dhcpleased 70510 167039 1 0 3 0x80 kqread dhcpleased 32603 179861 0 0 3 0x14200 bored smr 1865 342811 0 0 3 0x14200 pgzero zerothread 6944 211774 0 0 3 0x14200 aiodoned aiodoned 38927 51486 0 0 3 0x14200 syncer update 80822 165420 0 0 3 0x14200 cleaner cleaner 9611 156815 0 0 3 0x14200 reaper reaper 64566 476257 0 0 3 0x14200 pgdaemon pagedaemon 47569 206293 0 0 3 0x14200 bored viomb 11763 52588 0 0 3 0x40014200 acpi0 acpi0 3317 436547 0 0 3 0x40014200 idle1 5313 197166 0 0 3 0x14200 bored softnet3 25138 409094 0 0 3 0x14200 bored softnet2 40076 365706 0 0 3 0x14200 bored softnet1 30149 312259 0 0 2 0x14200 softnet0 10198 374504 0 0 3 0x14200 bored systqmp 40138 239259 0 0 3 0x14200 bored systq 55479 408780 0 0 3 0x14200 tmoslp softclockmp 45032 107166 0 0 3 0x40014200 tmoslp softclock 4282 73210 0 0 3 0x40014200 idle0 1 460368 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 70774 (syz-executor) thread 0xffff80003c5b8558 (157388) exclusive rwlock uobjlk r = 0 (0xfffffd806bec1ee8) #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 uvm_fault+0x1e9 sys/uvm/uvm_fault.c:690 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #4 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806bca5840) #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_read+0x3af sys/kern/kern_rwlock.c:405 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1864 #3 uvm_fault_check+0x4b sys/uvm/uvm_fault.c:732 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #6 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #7 recall_trap+0x8 Process 78755 (syz-executor) thread 0xffff80003c5b8038 (453878) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83906af8) #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:1021 #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 (0xffff800010fd2c98) #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:536 #3 soreceive+0x28e sys/kern/uipc_socket.c:882 #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10239 11183K 12368K 166960K 13463 0 pcb 20 15K 17K 166960K 355 0 rtable 209 9K 10K 166960K 482 0 pf 38 18K 26K 166960K 163 0 ifaddr 39 6K 7K 166960K 102 0 ifgroup 59 2K 2K 166960K 192 0 sysctl 4 1K 1K 166960K 8 0 counters 66 36K 37K 166960K 204 0 ioctlops 0 0K 4K 166960K 1794 0 iov 1 8K 25K 166960K 78 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1530 96K 96K 166960K 2920 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 20 0 VM map 2 1K 1K 166960K 2 0 sem 27 3K 3K 166960K 68 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 20 73K 93K 166960K 1492 0 sigio 0 0K 0K 166960K 27 0 proc 73 91K 127K 166960K 737 0 subproc 81 5K 5K 166960K 96 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 158 0 in_multi 78 5K 7K 166960K 154 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 629 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 255 74K 87K 166960K 15500 0 UVM aobj 15 5K 5K 166960K 19 0 pinsyscall 48 96K 106K 166960K 2660 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 183 0 NDP 13 0K 1K 166960K 74 0 temp 78 8648K 8716K 166960K 57003 0 kqueue 13 20K 34K 166960K 278 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 123 0 117 1 0 1 1 0 8 0 rtentry 112 143 0 55 4 1 3 4 0 8 0 unpcb 144 1499 0 1477 14 12 2 6 0 8 1 syncache 336 12 0 12 6 5 1 1 0 8 1 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 808 591 0 583 20 16 4 11 0 8 3 arp 120 22 0 6 1 0 1 1 0 8 0 inpcb 376 1731 0 1717 34 29 5 15 0 8 3 nd6 136 33 0 12 1 0 1 1 0 8 0 pkpcb 40 16 0 16 3 2 1 1 0 8 1 kcovpl 48 10 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1168 52 0 52 2 1 1 1 0 8 1 pppxif 1472 5 0 5 3 3 0 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 11 0 6 1 0 1 1 0 482 0 pffrnode 88 10 0 6 1 0 1 1 0 8 0 pffrent 40 14 0 9 1 0 1 1 0 8 0 pfosfp 40 1428 0 1428 5 5 0 5 0 8 0 pfosfpen 112 1428 0 1428 21 21 0 21 0 8 0 pfstitem 24 105 0 56 1 0 1 1 0 8 0 pfstkey 128 107 0 58 2 0 2 2 0 8 0 pfstate 376 106 0 57 6 0 6 6 0 8 0 pfrule 1344 23 0 18 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 587 0 219 32 6 26 27 0 8 2 art_table 32 589 0 219 4 0 4 4 0 8 0 art_node 16 141 0 63 1 0 1 1 0 8 0 sysvmsgpl 40 32 0 18 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 64 0 39 1 0 1 1 0 8 0 shmpl 112 16 0 4 1 0 1 1 0 8 0 dirhash 1024 36 0 19 3 0 3 3 0 8 0 dino2pl 256 4291 0 2784 95 0 95 95 0 8 0 ffsino 280 4291 0 2784 109 0 109 109 0 8 0 nchpl 144 6407 0 4716 63 0 63 63 0 8 0 rtmask 32 14 0 14 3 3 0 1 0 8 0 uvmvnodes 80 5255 0 0 108 0 108 108 0 8 0 vnodes 216 5255 0 0 292 0 292 292 0 8 0 namei 1024 22901 0 22901 1 0 1 1 0 8 1 percpumem 16 116 0 69 1 0 1 1 0 8 0 kstatmem 264 112 0 86 4 1 3 3 0 8 1 scsiplug 72 4 0 4 3 2 1 1 0 8 1 scxspl 216 20509 0 20509 12 11 1 8 1 8 1 plimitpl 152 378 0 359 1 0 1 1 0 8 0 sigapl 424 1819 0 1745 9 0 9 9 0 8 0 futexpl 64 26544 0 26534 1 0 1 1 0 8 0 knotepl 120 597 0 0 18 0 18 18 0 8 0 kqueuepl 216 522 0 512 5 4 1 3 0 8 0 pipepl 328 284 0 252 6 3 3 6 0 8 0 fdescpl 504 1778 0 1743 5 0 5 5 0 8 0 filepl 152 12927 0 12681 35 22 13 18 0 8 2 lockfpl 104 449 0 447 1 0 1 1 0 8 0 lockfspl 48 162 0 160 1 0 1 1 0 8 0 sessionpl 144 34 0 24 1 0 1 1 0 8 0 pgrppl 48 49 0 30 1 0 1 1 0 8 0 ucredpl 104 2794 0 2781 1 0 1 1 0 8 0 zombiepl 144 1745 0 1745 1 0 1 1 0 8 1 processpl 1176 1819 0 1745 6 0 6 6 0 8 0 procpl 656 4032 0 3948 8 0 8 8 0 8 0 srpgc 96 8 0 8 3 2 1 1 0 8 1 sosppl 168 7 0 7 4 3 1 1 0 8 1 sockpl 688 3386 0 3344 45 38 7 20 0 8 3 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 17 0 17 17 0 8 0 mcl2k 2048 37 0 0 5 0 5 5 0 8 0 mtagpl 96 59 0 0 2 0 2 2 0 8 0 mbufpl 256 297 0 0 18 0 18 18 0 8 0 bufpl 280 6167 0 136 431 0 431 431 0 8 0 anonpl 24 228311 0 222566 89 37 52 60 0 184 7 amapchunkpl 152 50207 0 49580 45 18 27 32 0 158 1 amappl16 200 3864 0 3789 41 34 7 17 0 8 0 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 132 0 118 1 0 1 1 0 8 0 amappl13 176 7 0 6 1 0 1 1 0 8 0 amappl12 168 2455 0 2419 4 1 3 3 0 8 0 amappl11 160 51 0 36 1 0 1 1 0 8 0 amappl10 152 2 0 2 1 1 0 1 0 8 0 amappl9 144 255 0 255 1 1 0 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 117 0 102 1 0 1 1 0 8 0 amappl6 120 217 0 211 1 0 1 1 0 8 0 amappl5 112 131 0 121 1 0 1 1 0 8 0 amappl4 104 344 0 325 1 0 1 1 0 8 0 amappl3 96 10302 0 10174 4 0 4 4 0 8 0 amappl2 88 736 0 665 2 0 2 2 0 8 0 amappl1 80 13753 0 13062 18 2 16 16 0 8 0 amappl 88 14986 0 14795 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 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 7 0 7 2 2 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 21 0 20 1 0 1 1 0 8 0 aobjpl 72 18 0 4 1 0 1 1 0 8 0 uaddrrnd 24 1778 0 1743 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1778 0 1743 1 0 1 1 0 8 0 vmmpekpl 168 15819 0 15768 3 0 3 3 0 8 0 vmmpepl 168 112279 0 110093 126 27 99 106 0 357 1 vmsppl 456 1777 0 1743 5 0 5 5 0 8 0 rwobjpl 64 35228 0 28815 105 1 104 104 0 8 0 pdppl 4096 3563 0 3486 115 38 77 85 0 8 0 pvpl 32 18124 0 0 148 2 146 147 0 265 0 pmappl 248 1777 0 1743 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 328 0 68 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(ffffffff8383aff0) 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(ffffffff839068f0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839068f0) at __mp_lock+0x199 sys/kern/kern_lock.c:144 intr_handler(ffff80002a422940,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x1a kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x1a sys/dev/kcov.c:153 __mp_lock(ffffffff839068f0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839068f0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff839068f0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839068f0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 uvm_fault(fffffd806bca5740,4d4728b1000,0,1) at uvm_fault+0x1ee sys/uvm/uvm_fault.c:691 upageflttrap(ffff80002a422e40,4d4728b1000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002a422e40) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7b38f00c0de0, count: -16 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(fffffd806e641a88,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd806e641a70,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd806e641a70,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd805f747460,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805f747460,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd805f747460,fffffd805f747898,0,0,200,0,9edc4182c04341d9) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd805f747460,fffffd805f747898,ffff80003c5b8038) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd805ed2b900,33,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff800010fd2bb8,ffff80003c4e4128,ffff80003c4e40d8,0,ffff80003c4e4118,ffff80003c4e429c,de26b5e3d13d6862) at soreceive+0xc73 sys/kern/uipc_socket.c:1021 recvit(ffff80003c5b8038,6,ffff80003c4e4270,0,ffff80003c4e4320) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff80003c5b8038,ffff80003c4e43d0,ffff80003c4e4320) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80003c4e43d0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4e43d0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f4167cedf0, count: -14