witness: lock order reversal: 1st 0xffff8000014ad160 sbufrcv (&so->so_rcv.sb_lock) 2nd 0xfffffd807e1872f8 inode (&ip->i_lock) lock order [1] sbufrcv (&so->so_rcv.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff8343fb6e -> 0xffffffff833a68ec 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(fffffd807e1872f8,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd807e1872e0,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd807e1872e0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd806928b0d8,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806928b0d8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd806928b0d8,fffffd80740fc6d8,0,0,200,0,703cd6b2af9361be) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd806928b0d8,fffffd80740fc6d8,ffff8000ffff34a8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd8075b61500,ec,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff8000014ad080,ffff80003c504828,ffff80003c5047d8,0,ffff80003c504818,ffff80003c50499c,2883d65b325980d) at soreceive+0xc73 sys/kern/uipc_socket.c:1021 recvit(ffff8000ffff34a8,5,ffff80003c504970,0,ffff80003c504a20) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff8000ffff34a8,ffff80003c504ad0,ffff80003c504a20) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80003c504ad0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c504ad0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ffad95340, count: -14 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003c5042b0 rbx 0xfffffd80047095f8 rdx 0xffff800001459f80 rcx 0xffff8000ffff34a8 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003c504190 r9 0x8080808080808080 r10 0x1af54bb889e4f21c r11 0x697495dd24ce5710 r12 0 r13 0xfffffd8003f20f00 r14 0x3 r15 0xffffffff rip 0xffffffff8136a795 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c5042a0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=498657 pid=98626 tcnt=3 stat=onproc flags process=1000000 proc=4000000 runpri=24, usrpri=83, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff3218,0xffff80003c542a88 process=0xffff80003c5a6050 user=0xffff80003c4ff000, vmspace=0xfffffd806bea9738 estcpu=33, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 68960 302493 64236 0 2 0 syz-executor 28906 34868 50529 0 2 0 syz-executor 28906 129698 50529 0 7 0x4000000 syz-executor 98626 432136 32850 0 2 0x1000000 syz-executor *98626 498657 32850 0 7 0x5000000 syz-executor 98626 473042 32850 0 2 0x5000000 syz-executor 63698 140715 66068 0 3 0x80 nanoslp syz-executor 63698 25882 66068 0 3 0x4000080 kqread syz-executor 63698 309823 66068 0 3 0x4000080 fsleep syz-executor 9092 36088 25089 0 3 0x80 nanoslp syz-executor 9092 492785 25089 0 3 0x4000080 fsleep syz-executor 9092 342976 25089 0 3 0x4000080 pipewr syz-executor 50529 31064 68500 0 3 0x82 nanoslp syz-executor 32850 391928 68500 0 3 0x82 nanoslp syz-executor 64236 345472 68500 0 3 0x82 nanoslp syz-executor 58127 120562 0 0 3 0x14280 nfsidl nfsio 38518 433400 0 0 3 0x14280 nfsidl nfsio 7550 328092 0 0 3 0x14280 nfsidl nfsio 54780 425889 0 0 3 0x14280 nfsidl nfsio 71740 362393 0 0 3 0x14280 nfsidl nfsio 74986 497346 0 0 3 0x14280 nfsidl nfsio 83706 416862 0 0 3 0x14280 nfsidl nfsio 87944 260927 0 0 3 0x14280 nfsidl nfsio 50117 12884 0 0 3 0x14280 nfsidl nfsio 37265 108466 0 0 3 0x14280 nfsidl nfsio 81882 45703 0 0 3 0x14280 nfsidl nfsio 69139 152841 0 0 3 0x14280 nfsidl nfsio 35805 254631 0 0 3 0x14280 nfsidl nfsio 80127 249203 0 0 3 0x14280 nfsidl nfsio 53014 216464 0 0 3 0x14280 nfsidl nfsio 80384 375522 0 0 3 0x14280 nfsidl nfsio 29026 387653 0 0 3 0x14280 nfsidl nfsio 67295 354799 0 0 3 0x14280 nfsidl nfsio 19236 120219 0 0 3 0x14280 nfsidl nfsio 57756 91526 0 0 3 0x14280 nfsidl nfsio 77162 247369 1 0 3 0x82 nanoslp getty 83195 292073 0 0 3 0x14200 bored sosplice 88510 287001 32719 0 3 0x82 sbwait sshd-session 66068 47604 68500 0 3 0x82 nanoslp syz-executor 71401 450524 68500 0 3 0x82 nanoslp syz-executor 25089 155263 68500 0 3 0x82 nanoslp syz-executor 4430 397024 68500 0 3 0x82 nanoslp syz-executor 39551 345430 68500 0 2 0x10000482 syz-executor 68500 101970 69965 0 3 0x82 kqread syz-executor 69965 226439 89525 0 3 0x10008a sigsusp ksh 89525 1002 40787 0 3 0x98 kqread sshd-session 40787 414363 32719 0 3 0x92 kqread sshd-session 32719 23963 1 0 3 0x88 kqread sshd 20844 461880 60417 74 3 0x1100092 bpf pflogd 60417 134434 1 0 3 0x80 sbwait pflogd 58458 25250 77615 73 3 0x1100090 kqread syslogd 77615 268306 1 0 3 0x100082 sbwait syslogd 78618 257415 1 0 3 0x100080 kqread resolvd 54000 12734 97790 77 3 0x100092 kqread dhcpleased 99645 185824 97790 77 3 0x100092 kqread dhcpleased 97790 172688 1 0 3 0x80 kqread dhcpleased 36640 125610 0 0 2 0x40014200 smr 96733 215665 0 0 2 0x14200 zerothread 48732 450066 0 0 3 0x14200 aiodoned aiodoned 91167 395388 0 0 3 0x14200 syncer update 41174 433079 0 0 3 0x14200 cleaner cleaner 10504 75378 0 0 3 0x14200 reaper reaper 46555 316921 0 0 3 0x14200 pgdaemon pagedaemon 63461 520804 0 0 3 0x14200 bored viomb 53961 371127 0 0 3 0x40014200 acpi0 acpi0 7952 358915 0 0 3 0x40014200 idle1 89454 437741 0 0 3 0x14200 bored softnet3 61311 78620 0 0 3 0x14200 bored softnet2 49637 140560 0 0 3 0x14200 bored softnet1 36032 450880 0 0 2 0x14200 softnet0 89285 453611 0 0 3 0x14200 bored systqmp 1035 34522 0 0 3 0x14200 bored systq 96890 356993 0 0 3 0x14200 tmoslp softclockmp 53676 384256 0 0 2 0x40014200 softclock 97533 28344 0 0 3 0x40014200 idle0 1 318597 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 98626 (syz-executor) thread 0xffff8000ffff34a8 (498657) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8398f708) #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 (0xffff8000014ad160) #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 10236 11045K 11487K 166960K 14571 0 pcb 17 14K 16K 166960K 421 0 rtable 205 10K 11K 166960K 645 0 pf 38 18K 25K 166960K 245 0 ifaddr 37 6K 7K 166960K 125 0 ifgroup 57 2K 2K 166960K 213 0 sysctl 4 1K 1K 166960K 6 0 counters 68 36K 37K 166960K 228 0 ioctlops 0 0K 4K 166960K 1741 0 iov 0 0K 20K 166960K 94 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1393 88K 88K 166960K 3125 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 34 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 116 0 dirhash 12 2K 2K 166960K 72 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 2071 0 sigio 0 0K 0K 166960K 45 0 proc 72 91K 140K 166960K 835 0 subproc 72 4K 4K 166960K 109 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 444 0 in_multi 68 5K 7K 166960K 198 0 ether_multi 1 0K 0K 166960K 11 0 mrt 1 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 797 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 238 73K 92K 166960K 21075 0 UVM aobj 41 2K 2K 166960K 45 0 pinsyscall 44 88K 106K 166960K 3381 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 136 0 NDP 13 0K 2K 166960K 93 0 temp 79 8644K 8768K 166960K 79802 0 kqueue 17 28K 32K 166960K 320 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 120 182 0 179 1 0 1 1 0 8 0 rtentry 112 192 0 109 4 0 4 4 0 8 0 unpcb 144 1972 0 1951 14 12 2 8 0 8 1 syncache 336 24 0 24 3 2 1 1 0 8 1 tcpqe 32 6 0 6 3 2 1 1 0 8 1 tcpcb 808 701 0 689 17 9 8 8 0 8 6 arp 120 32 0 15 1 0 1 1 0 8 0 inpcb 376 2407 0 2392 19 10 9 9 0 8 7 ip6q 72 3 0 3 3 3 0 1 0 8 0 ip6af 40 6 0 6 3 3 0 1 0 8 0 nd6 136 41 0 25 1 0 1 1 0 8 0 pkpcb 40 81 0 81 2 1 1 1 0 8 1 kcovpl 48 12 0 4 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1168 63 0 61 2 1 1 1 0 8 0 pppxif 1472 3 0 3 2 1 1 1 0 8 1 pffrag 232 26 0 17 1 0 1 1 0 482 0 pffrnode 88 24 0 16 1 0 1 1 0 8 0 pffrent 40 49 0 40 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 24 124 0 34 1 0 1 1 0 8 0 pfstkey 128 124 0 34 3 0 3 3 0 8 0 pfstate 376 124 0 34 9 0 9 9 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 797 0 466 31 7 24 29 0 8 1 art_table 32 801 0 466 4 0 4 4 0 8 0 art_node 16 187 0 114 1 0 1 1 0 8 0 sysvmsgpl 40 29 0 18 1 0 1 1 0 8 0 semapl 112 111 0 101 1 0 1 1 0 8 0 shmpl 112 42 0 4 2 0 2 2 0 8 0 dirhash 1024 58 0 41 3 0 3 3 0 8 0 dino2pl 256 5044 0 3532 96 1 95 96 0 8 0 ffsino 280 5044 0 3532 109 0 109 109 0 8 0 nchpl 144 8007 0 6305 64 0 64 64 0 8 0 rtmask 32 15 0 15 2 1 1 1 0 8 1 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 29798 0 29798 1 0 1 1 0 8 1 percpumem 16 128 0 80 1 0 1 1 0 8 0 kstatmem 264 132 0 106 3 0 3 3 0 8 1 scsiplug 72 8 0 8 2 2 0 1 0 8 0 scxspl 216 25854 0 25854 13 11 2 8 1 8 2 plimitpl 152 483 0 466 1 0 1 1 0 8 0 sigapl 424 2413 0 2341 10 1 9 9 0 8 0 futexpl 64 29607 0 29605 1 0 1 1 0 8 0 knotepl 120 566 0 0 17 0 17 17 0 8 0 kqueuepl 216 694 0 681 6 1 5 5 0 8 4 pipepl 328 430 0 401 6 3 3 6 0 8 0 fdescpl 504 2372 0 2340 5 0 5 5 0 8 0 filepl 152 16528 0 16301 28 15 13 19 0 8 1 lockfpl 104 877 0 874 3 2 1 2 0 8 0 lockfspl 48 281 0 278 1 0 1 1 0 8 0 sessionpl 144 45 0 36 1 0 1 1 0 8 0 pgrppl 48 86 0 69 1 0 1 1 0 8 0 ucredpl 104 2684 0 2670 1 0 1 1 0 8 0 zombiepl 144 2344 0 2341 2 1 1 1 0 8 0 processpl 1176 2413 0 2341 6 0 6 6 0 8 0 procpl 656 5648 0 5569 8 0 8 8 0 8 0 srpgc 96 8 0 8 3 2 1 1 0 8 1 sosppl 168 7 0 7 2 2 0 1 0 8 0 sockpl 688 4729 0 4690 45 35 10 22 0 8 6 mcl64k 65536 6 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 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 125 0 0 16 0 16 16 0 8 0 mcl2k 2048 45 0 0 5 0 5 5 0 8 0 mtagpl 96 77 0 0 2 0 2 2 0 8 0 mbufpl 256 324 0 0 19 0 19 19 0 8 0 bufpl 280 8243 0 2088 440 0 440 440 0 8 0 anonpl 24 281754 0 276617 71 17 54 56 0 184 8 amapchunkpl 152 68432 0 67854 43 13 30 32 0 158 3 amappl16 200 5004 0 4958 36 24 12 16 0 8 4 amappl15 192 8 0 8 2 2 0 1 0 8 0 amappl14 184 160 0 147 1 0 1 1 0 8 0 amappl13 176 4 0 3 1 0 1 1 0 8 0 amappl12 168 3112 0 3081 3 1 2 2 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 5 0 4 1 0 1 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 24 0 20 1 0 1 1 0 8 0 amappl7 128 138 0 125 1 0 1 1 0 8 0 amappl6 120 234 0 229 1 0 1 1 0 8 0 amappl5 112 175 0 165 1 0 1 1 0 8 0 amappl4 104 404 0 385 1 0 1 1 0 8 0 amappl3 96 14266 0 14154 4 0 4 4 0 8 0 amappl2 88 918 0 848 2 0 2 2 0 8 0 amappl1 80 18506 0 17848 17 1 16 16 0 8 0 amappl 88 20456 0 20279 5 0 5 5 0 92 0 dma65536 65536 2 0 2 2 2 0 1 0 8 0 dma8192 8192 3 0 3 2 1 1 1 0 8 1 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 7 0 7 2 2 0 1 0 8 0 dma128 128 254 0 254 2 2 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 44 0 4 1 0 1 1 0 8 0 uaddrrnd 24 2372 0 2340 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2372 0 2340 1 0 1 1 0 8 0 vmmpekpl 168 20970 0 20911 3 0 3 3 0 8 0 vmmpepl 168 151585 0 149561 114 17 97 102 0 357 0 vmsppl 456 2371 0 2340 5 0 5 5 0 8 0 rwobjpl 64 46112 0 39088 118 3 115 115 0 8 0 pdppl 4096 4752 0 4680 120 44 76 86 0 8 4 pvpl 32 18670 0 0 152 1 151 151 0 265 0 pmappl 248 2371 0 2340 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 334 0 71 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(ffffffff837e4ff0) 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(ffffffff8398f500) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8398f500) at __mp_lock+0x192 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+0x38 sys/dev/kcov.c:159 rw_do_enter_read(fffffd806bc4ad80,0) at rw_do_enter_read+0x192 sys/kern/kern_rwlock.c:356 uvmfault_lookup(ffff800036cca538,0) at uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1864 uvm_fault_check(ffff800036cca538,ffff800036cca570,ffff800036cca5a0,0) at uvm_fault_check+0x4b sys/uvm/uvm_fault.c:732 uvm_fault(fffffd806bc4ac98,6e000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:668 kpageflttrap(ffff800036cca6e0,6e920) at kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279 kerntrap(ffff800036cca6e0) at kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 syscall(ffff800036ccab30) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800036ccab30) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x62795103360, count: -17 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(fffffd807e1872f8,9,0) at witness_checkorder+0x1047 rw_do_enter_write(fffffd807e1872e0,1) at rw_do_enter_write+0xb7 sys/kern/kern_rwlock.c:233 rrw_enter(fffffd807e1872e0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 VOP_LOCK(fffffd806928b0d8,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806928b0d8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_getcwd_common(fffffd806928b0d8,fffffd80740fc6d8,0,0,200,0,703cd6b2af9361be) at vfs_getcwd_common+0xd1 sys/kern/vfs_getcwd.c:287 vn_isunder(fffffd806928b0d8,fffffd80740fc6d8,ffff8000ffff34a8) at vn_isunder+0x56 sys/kern/vfs_vnops.c:694 unp_externalize(fffffd8075b61500,ec,0) at unp_externalize+0x286 sys/kern/uipc_usrreq.c:1086 soreceive(ffff8000014ad080,ffff80003c504828,ffff80003c5047d8,0,ffff80003c504818,ffff80003c50499c,2883d65b325980d) at soreceive+0xc73 sys/kern/uipc_socket.c:1021 recvit(ffff8000ffff34a8,5,ffff80003c504970,0,ffff80003c504a20) at recvit+0x40a sys/kern/uipc_syscalls.c:1072 sys_recvmsg(ffff8000ffff34a8,ffff80003c504ad0,ffff80003c504a20) at sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:872 syscall(ffff80003c504ad0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c504ad0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ffad95340, count: -14