witness: lock order reversal: 1st 0xffff8000013296c0 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd806aca83d0 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff830beb84 -> 0xffffffff83071f68 is missing lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock) #0 rw_enter+0x122 #1 sblock+0xb7 sys/kern/uipc_socket2.c:549 #2 soreceive+0x295 sys/kern/uipc_socket.c:945 #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+0xf6 sys/kern/vfs_vnops.c:525 #10 sys_ioctl+0x67c #11 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #11 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #12 Xsyscall+0x128 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] sbufsnd (&so->so_snd.sb_lock) #0 rw_enter+0x122 #1 sblock+0xb7 sys/kern/uipc_socket2.c:549 #2 sosplice+0x3f4 sys/kern/uipc_socket.c:1454 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1228 #4 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #4 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #5 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(fffffd806aca83d0,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806aca83c0,1) at rw_enter+0x122 rrw_enter(fffffd806aca83c0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8065bf2130,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8065bf2130,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800035bb5d88) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800035bb5d88) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800001329518,fffffd806aefb500,ffff8000ffff07c8) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff800001329518,fffffd80639e4900,fffffd806aefb500,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff800001329518,fffffd806aefb500,ffff800035bb6018,0,0,0) at sosend+0xa40 sendit(ffff8000ffff07c8,4,ffff800035bb6190,0,ffff800035bb6250) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff8000ffff07c8,ffff800035bb6300,ffff800035bb6250) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800035bb6300) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800035bb6300) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb01cc9c8850, count: -15 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff800035bb59e0 rbx 0xfffffd80042c8570 rdx 0xffff8000012a27c0 rcx 0xffff8000ffff07c8 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff800035bb58c0 r9 0x8080808080808080 r10 0x8c8948965247e935 r11 0xc55a3ffc589fa42b r12 0 r13 0xfffffd8003adfe00 r14 0x3 r15 0xffffffff rip 0xffffffff812ecd15 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800035bb59d0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=518915 pid=64629 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff1980,0xffff8000ffff02c8 process=0xffff8000fffea8d0 user=0xffff800035bb1000, vmspace=0xfffffd806ae20028 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27412 332905 93155 0 7 0 syz-executor 27412 111292 93155 0 3 0x4000080 fsleep syz-executor 57275 23246 35468 0 2 0 syz-executor 57275 76988 35468 0 2 0x4000000 syz-executor 64629 417076 40051 0 2 0 syz-executor *64629 518915 40051 0 7 0x4000000 syz-executor 33986 434480 38331 0 2 0 syz-executor 33986 302968 38331 0 3 0x4000080 fsleep syz-executor 33986 480843 38331 0 3 0x4000080 fsleep syz-executor 18832 391348 88496 0 3 0x80 nanoslp syz-executor 18832 495135 88496 0 3 0x4000000 smrbar syz-executor 18832 255999 88496 0 3 0x4000080 fsleep syz-executor 18832 56221 88496 0 3 0x4000080 fsleep syz-executor 95608 343245 92584 0 2 0 syz-executor 95608 500391 92584 0 3 0x4000080 fifor syz-executor 95608 47139 92584 0 3 0x4000080 fsleep syz-executor 72297 364142 17413 0 3 0x80 nanoslp syz-executor 72297 190775 17413 0 3 0x4000080 fsleep syz-executor 72297 341865 17413 0 3 0x4000080 netacc syz-executor 72297 6698 17413 0 3 0x4000080 fsleep syz-executor 75147 395000 14432 0 3 0x80 nanoslp syz-executor 75147 260123 14432 0 3 0x4000080 ttyin syz-executor 75147 141920 14432 0 3 0x4000080 fsleep syz-executor 38331 366990 6524 0 2 0x2 syz-executor 84010 318672 1 0 3 0x100083 ttyin getty 47400 512335 0 0 3 0x14280 nfsidl nfsio 86066 514698 0 0 3 0x14280 nfsidl nfsio 38347 127697 0 0 3 0x14280 nfsidl nfsio 25801 496433 0 0 3 0x14280 nfsidl nfsio 17760 216976 0 0 3 0x14280 nfsidl nfsio 16773 253756 0 0 3 0x14280 nfsidl nfsio 57216 211266 0 0 3 0x14280 nfsidl nfsio 64825 366925 0 0 3 0x14280 nfsidl nfsio 51322 352718 0 0 3 0x14280 nfsidl nfsio 32868 394849 0 0 3 0x14280 nfsidl nfsio 31067 301219 0 0 3 0x14280 nfsidl nfsio 57108 205474 0 0 3 0x14280 nfsidl nfsio 78982 304611 0 0 3 0x14280 nfsidl nfsio 10686 327338 0 0 3 0x14280 nfsidl nfsio 36135 418431 0 0 3 0x14280 nfsidl nfsio 87744 86965 0 0 3 0x14280 nfsidl nfsio 45000 111009 0 0 3 0x14280 nfsidl nfsio 72407 425906 0 0 3 0x14280 nfsidl nfsio 74317 191932 0 0 3 0x14280 nfsidl nfsio 31281 291009 0 0 3 0x14280 nfsidl nfsio 99828 500166 0 0 3 0x14200 bored sosplice 35354 413583 26848 0 3 0x82 netio sshd-session 1428 166888 0 0 3 0x14200 acct acct 92584 422390 6524 0 3 0x82 nanoslp syz-executor 93155 126159 6524 0 3 0x82 nanoslp syz-executor 88496 346682 6524 0 3 0x82 nanoslp syz-executor 40051 323282 6524 0 3 0x82 nanoslp syz-executor 14432 475884 6524 0 3 0x82 nanoslp syz-executor 17413 360270 6524 0 3 0x82 nanoslp syz-executor 35468 571 6524 0 3 0x82 nanoslp syz-executor 6524 184159 31628 0 3 0x82 kqread syz-executor 31628 22290 84190 0 3 0x10008a sigsusp ksh 84190 484229 80750 0 3 0x98 kqread sshd-session 80750 166398 26848 0 3 0x92 kqread sshd-session 26848 147993 1 0 3 0x88 kqread sshd 84577 244814 17957 74 3 0x1100092 bpf pflogd 17957 267107 1 0 3 0x80 sbwait pflogd 52808 18960 81501 73 3 0x1100090 kqread syslogd 81501 440803 1 0 3 0x100082 sbwait syslogd 93846 340029 1 0 3 0x100080 kqread resolvd 42484 86875 23486 77 3 0x100092 kqread dhcpleased 72886 355460 23486 77 3 0x100092 kqread dhcpleased 23486 254988 1 0 3 0x80 kqread dhcpleased 40710 211042 0 0 3 0x14200 bored smr 61827 445112 0 0 2 0x14200 zerothread 49127 280333 0 0 3 0x14200 aiodoned aiodoned 54013 28272 0 0 3 0x14200 syncer update 78280 325892 0 0 3 0x14200 cleaner cleaner 21113 191438 0 0 3 0x14200 reaper reaper 22056 181128 0 0 3 0x14200 pgdaemon pagedaemon 12081 176370 0 0 3 0x14200 bored viomb 87032 351778 0 0 3 0x40014200 acpi0 acpi0 31835 168225 0 0 3 0x40014200 idle1 20324 281717 0 0 3 0x14200 bored softnet3 16588 22367 0 0 3 0x14200 bored softnet2 67447 382130 0 0 3 0x14200 bored softnet1 99349 379505 0 0 3 0x14200 bored softnet0 55663 87493 0 0 3 0x14200 bored systqmp 51399 409181 0 0 3 0x14200 bored systq 35045 58150 0 0 3 0x14200 tmoslp softclockmp 25757 122101 0 0 3 0x40014200 tmoslp softclock 74974 182653 0 0 3 0x40014200 idle0 1 63685 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 27412 (syz-executor) thread 0xffff8000ffff16f8 (332905) shared rwlock vmmaplk r = 0 (0xfffffd806ae209e0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1819 #2 uvm_fault_check+0x49 sys/uvm/uvm_fault.c:672 #3 uvm_fault+0xf5 sys/uvm/uvm_fault.c:600 #4 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #5 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #6 recall_trap+0x8 Process 64629 (syz-executor) thread 0xffff8000ffff07c8 (518915) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff836258d8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 unp_connect+0x26c sys/kern/uipc_usrreq.c:868 #2 uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 #3 sosend+0xa40 #4 sendit+0x721 sys/kern/uipc_syscalls.c:786 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 #6 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff8000013296c0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 sblock+0xb7 sys/kern/uipc_socket2.c:549 #3 sosend+0x2ff sys/kern/uipc_socket.c:681 #4 sendit+0x721 sys/kern/uipc_syscalls.c:786 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 #6 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 18832 (syz-executor) thread 0xffff80002a0d11f0 (495135) exclusive rwlock clonelk r = 0 (0xffffffff8343e420) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 if_clone_destroy+0x67 #2 ifioctl+0x5c5 #3 sys_ioctl+0x67c #4 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #4 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10234 11334K 15340K 166960K 14108 0 pcb 19 15K 17K 166960K 490 0 rtable 191 7K 7K 166960K 712 0 pf 42 19K 27K 166960K 173 0 ifaddr 40 6K 7K 166960K 75 0 ifgroup 66 2K 3K 166960K 117 0 sysctl 3 0K 0K 166960K 5 0 counters 68 36K 37K 166960K 94 0 ioctlops 0 0K 4K 166960K 1641 0 iov 0 0K 24K 166960K 80 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1505 95K 95K 166960K 2740 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 26 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 63 0 dirhash 12 2K 3K 166960K 63 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 97K 166960K 1538 0 sigio 1 0K 0K 166960K 35 0 proc 72 91K 152K 166960K 714 0 subproc 104 6K 6K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 342 0 in_multi 78 5K 7K 166960K 185 0 ether_multi 1 0K 0K 166960K 9 0 mrt 0 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 151 678K 678K 166960K 151 0 exec 0 0K 1K 166960K 586 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 269 74K 88K 166960K 16043 0 UVM aobj 83 7K 7K 166960K 89 0 pinsyscall 45 90K 109K 166960K 2701 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 82 0 NDP 14 0K 2K 166960K 53 0 temp 76 6828K 7075K 166960K 54783 0 kqueue 13 20K 32K 166960K 255 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 120 112 0 108 1 0 1 1 0 8 0 rtentry 112 255 0 171 4 0 4 4 0 8 0 unpcb 144 1161 0 1105 11 8 3 6 0 8 0 syncache 336 16 0 16 3 3 0 1 0 8 0 tcpqe 32 3 0 3 2 2 0 1 0 8 0 tcpcb 808 451 0 441 8 6 2 8 0 8 1 arp 120 58 0 41 1 0 1 1 0 8 0 inpcb 336 1983 0 1967 31 26 5 13 0 8 2 nd6 136 35 0 15 1 0 1 1 0 8 0 pkpcb 40 3 0 3 3 3 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1168 4 0 4 3 2 1 1 0 8 1 pffrag 232 9 0 3 1 0 1 1 0 482 0 pffrnode 88 9 0 3 1 0 1 1 0 8 0 pffrent 40 19 0 13 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 pfstitem 24 90 0 26 1 0 1 1 0 8 0 pfstkey 128 90 0 26 3 0 3 3 0 8 0 pfstate 376 90 0 26 7 0 7 7 0 8 0 pfrule 1344 27 0 20 2 0 2 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 802 0 419 32 8 24 29 0 8 0 art_table 32 804 0 419 4 0 4 4 0 8 0 art_node 16 254 0 180 1 0 1 1 0 8 0 sysvmsgpl 40 39 0 5 1 0 1 1 0 8 0 semupl 112 3 0 3 2 2 0 1 0 8 0 semapl 112 59 0 49 1 0 1 1 0 8 0 shmpl 112 86 0 6 3 0 3 3 0 8 0 dirhash 1024 51 0 34 3 0 3 3 0 8 0 dino2pl 256 4053 0 2560 95 0 95 95 0 8 0 ffsino 272 4053 0 2560 101 0 101 101 0 8 0 nchpl 144 6214 0 4520 63 0 63 63 0 8 0 uvmvnodes 80 5124 0 0 105 0 105 105 0 8 0 vnodes 216 5124 0 0 285 0 285 285 0 8 0 namei 1024 22903 0 22902 5 3 2 2 0 8 1 percpumem 16 61 0 13 1 0 1 1 0 8 0 kstatmem 264 54 0 26 3 1 2 3 0 8 0 scsiplug 72 4 0 4 2 2 0 1 0 8 0 scxspl 216 19933 0 19933 12 11 1 8 1 8 1 plimitpl 152 301 0 284 1 0 1 1 0 8 0 sigapl 424 1870 0 1797 9 0 9 9 0 8 0 futexpl 64 22112 0 22103 1 0 1 1 0 8 0 knotepl 120 561 0 0 17 0 17 17 0 8 0 kqueuepl 216 555 0 546 5 4 1 5 0 8 0 pipepl 320 460 0 431 11 8 3 11 0 8 0 fdescpl 496 1830 0 1797 6 1 5 6 0 8 0 filepl 152 13176 0 12882 22 7 15 19 0 8 1 lockfpl 104 561 0 559 1 0 1 1 0 8 0 lockfspl 48 221 0 219 1 0 1 1 0 8 0 sessionpl 144 37 0 27 1 0 1 1 0 8 0 pgrppl 48 58 0 40 1 0 1 1 0 8 0 ucredpl 104 2138 0 2124 1 0 1 1 0 8 0 zombiepl 144 1847 0 1847 2 1 1 1 0 8 1 processpl 1160 1870 0 1797 7 1 6 6 0 8 0 procpl 648 4175 0 4087 8 0 8 8 0 8 0 srpgc 96 10 0 10 3 3 0 1 0 8 0 sosppl 168 7 0 7 3 2 1 1 0 8 1 sockpl 664 3285 0 3210 42 35 7 15 0 8 0 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 10 0 0 2 0 2 2 0 8 0 mcl4k 4096 153 0 0 20 0 20 20 0 8 0 mcl2k 2048 34 0 0 5 0 5 5 0 8 0 mtagpl 96 102 0 0 3 0 3 3 0 8 0 mbufpl 256 376 0 0 23 0 23 23 0 8 0 bufpl 280 6356 0 182 442 0 442 442 0 8 0 anonpl 24 323706 0 318296 89 31 58 63 0 185 12 amapchunkpl 152 52656 0 51984 36 8 28 33 0 158 1 amappl16 200 8478 0 8442 43 28 15 16 0 8 10 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 142 0 129 1 0 1 1 0 8 0 amappl13 176 53 0 53 1 1 0 1 0 8 0 amappl12 168 2501 0 2468 4 1 3 3 0 8 0 amappl11 160 89 0 75 1 0 1 1 0 8 0 amappl10 152 14 0 14 2 2 0 1 0 8 0 amappl9 144 206 0 204 1 0 1 1 0 8 0 amappl8 136 27 0 24 1 0 1 1 0 8 0 amappl7 128 124 0 111 1 0 1 1 0 8 0 amappl6 120 185 0 184 1 0 1 1 0 8 0 amappl5 112 153 0 140 1 0 1 1 0 8 0 amappl4 104 364 0 345 1 0 1 1 0 8 0 amappl3 96 9652 0 9544 3 0 3 3 0 8 0 amappl2 88 2211 0 2118 3 0 3 3 0 8 0 amappl1 80 14832 0 14174 17 1 16 16 0 8 0 amappl 88 15484 0 15284 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 128 255 0 255 3 3 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 21 0 20 1 0 1 1 0 8 0 aobjpl 72 88 0 6 2 0 2 2 0 8 0 uaddrrnd 24 1830 0 1797 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1830 0 1797 1 0 1 1 0 8 0 vmmpekpl 168 17268 0 17224 3 0 3 3 0 8 0 vmmpepl 168 123801 0 121711 122 20 102 102 0 357 6 vmsppl 448 1829 0 1797 6 2 4 5 0 8 0 rwobjpl 56 41363 0 35083 92 1 91 91 0 8 0 pdppl 4096 3667 0 3594 145 72 73 87 0 8 0 pvpl 32 17616 0 0 143 1 142 142 0 265 0 pmappl 248 1829 0 1797 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 491 0 126 11 0 11 11 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(fffffd806aca83d0,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806aca83c0,1) at rw_enter+0x122 rrw_enter(fffffd806aca83c0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd8065bf2130,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd8065bf2130,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vfs_lookup(ffff800035bb5d88) at vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 namei(ffff800035bb5d88) at namei+0x7aa sys/kern/vfs_lookup.c:250 unp_connect(ffff800001329518,fffffd806aefb500,ffff8000ffff07c8) at unp_connect+0x27d sys/kern/uipc_usrreq.c:868 uipc_dgram_send(ffff800001329518,fffffd80639e4900,fffffd806aefb500,0) at uipc_dgram_send+0x131 sys/kern/uipc_usrreq.c:607 sosend(ffff800001329518,fffffd806aefb500,ffff800035bb6018,0,0,0) at sosend+0xa40 sendit(ffff8000ffff07c8,4,ffff800035bb6190,0,ffff800035bb6250) at sendit+0x721 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff8000ffff07c8,ffff800035bb6300,ffff800035bb6250) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:604 syscall(ffff800035bb6300) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff800035bb6300) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb01cc9c8850, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b7bff0) 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 __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(ffffffff836256d0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff836256d0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 uvm_fault(fffffd806ae208e8,e3a97587000,0,1) at uvm_fault+0x1e0 sys/uvm/uvm_fault.c:622 upageflttrap(ffff80003728af40,e3a97587000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80003728af40) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x796454c0c3c0, count: -9