witness: lock order reversal: 1st 0xffff800010fdede0 sbufsnd (&so->so_snd.sb_lock) 2nd 0xfffffd807c23c6b0 inode (&ip->i_lock) lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff833d32bf -> 0xffffffff8334590b is missing lock order [2] inode (&ip->i_lock) -> [3] 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 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] sbufsnd (&so->so_snd.sb_lock) #0 rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 #1 sblock+0xb6 sys/kern/uipc_socket2.c:536 #2 sosplice+0x3e1 sys/kern/uipc_socket.c:1347 #3 sys_setsockopt+0x2ba sys/kern/uipc_syscalls.c:1227 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #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:438 witness_checkorder(fffffd807c23c6b0,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd807c23c698,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd807c23c698,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8069da97e0,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd8069da97e0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c452050) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff80003c452050) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fdebf8,fffffd805e335d00,ffff8000373f1780) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff800010fdebf8,fffffd805eeb3600,fffffd805e335d00,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff800010fdebf8,fffffd805e335d00,ffff80003c4522d8,0,0,c) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff8000373f1780,3,ffff80003c452458,c,ffff80003c452510) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff8000373f1780,ffff80003c4525c0,ffff80003c452510) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff80003c4525c0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4525c0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdcf59cf38e0, count: -15 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c451cd0 rbx 0 rdx 0 rcx 0xffff8000373f1780 rax 0xffffffff837efff0 cpu_info_full_primary+0x1ff0 r8 0xffff80003c451bb0 r9 0x8080808080808080 r10 0xdfac6a902450596f r11 0x211a7cfdd6adf84f r12 0xfffffd8003eff680 r13 0xfffffd80046e70a8 r14 0x3 r15 0xffffffff833e2b64 substchar+0xf1da rip 0xffffffff831577a5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c451cc0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=404064 pid=55728 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000373f0fb8,0xffff8000373f1a28 process=0xffff8000fffece90 user=0xffff80003c44d000, vmspace=0xfffffd800b0273d0 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 55728 454548 71427 0 3 0x80 nanoslp syz-executor *55728 404064 71427 0 7 0x4000000 syz-executor 55728 491174 71427 0 3 0x4000080 fsleep syz-executor 52655 400226 47213 0 2 0 syz-executor 52655 451541 47213 0 3 0x4000080 fsleep syz-executor 52655 14221 47213 0 3 0x4000080 fsleep syz-executor 68683 454564 29095 0 2 0 syz-executor 63143 476648 55146 0 2 0 syz-executor 63143 484413 55146 0 3 0x4000080 fsleep syz-executor 63143 244594 55146 0 3 0x4000080 fsleep syz-executor 1921 89583 16487 0 2 0 syz-executor 1921 121155 16487 0 3 0x4000080 fsleep syz-executor 1921 264571 16487 0 2 0x4000000 syz-executor 79038 335748 77209 0 2 0 syz-executor 79038 503220 77209 0 3 0x4000080 fsleep syz-executor 41787 94482 82790 0 2 0 syz-executor 41787 497197 82790 0 7 0x4000000 syz-executor 41787 111160 82790 0 3 0x4000000 fltagain2 syz-executor 55146 362425 69391 0 3 0x82 nanoslp syz-executor 42500 375523 90474 0 3 0x3000 suspend syz-executor 42500 358285 90474 0 3 0x4081000 biowait syz-executor 58692 197174 0 0 3 0x14200 acct acct 71427 471307 69391 0 3 0x82 nanoslp syz-executor 16487 407498 69391 0 3 0x82 nanoslp syz-executor 90474 504798 69391 0 3 0x82 nanoslp syz-executor 47213 221745 69391 0 3 0x82 nanoslp syz-executor 29095 122969 69391 0 3 0x82 nanoslp syz-executor 17905 35092 1 0 3 0x100083 ttyin getty 92658 58027 0 0 3 0x14200 bored sosplice 82790 82208 69391 0 3 0x82 nanoslp syz-executor 77209 105223 69391 0 3 0x82 nanoslp syz-executor 69391 102847 98016 0 3 0x82 kqread syz-executor 98016 131977 30514 0 3 0x10008a sigsusp ksh 30514 414415 1794 0 3 0x98 kqread sshd-session 1794 406062 20927 0 3 0x92 kqread sshd-session 20927 484961 1 0 3 0x88 kqread sshd 97824 214787 38183 74 3 0x1100092 bpf pflogd 38183 18534 1 0 3 0x80 sbwait pflogd 34966 233209 36305 73 3 0x1100090 kqread syslogd 36305 359660 1 0 3 0x100082 sbwait syslogd 56429 148956 1 0 3 0x100080 kqread resolvd 88088 297538 89630 77 3 0x100092 kqread dhcpleased 74773 282885 89630 77 3 0x100092 kqread dhcpleased 89630 297326 1 0 3 0x80 kqread dhcpleased 43937 482913 0 0 3 0x14200 bored smr 18074 230616 0 0 2 0x14200 zerothread 82340 380299 0 0 3 0x14200 aiodoned aiodoned 74893 351493 0 0 3 0x14200 syncer update 59458 75005 0 0 3 0x14200 cleaner cleaner 20062 493123 0 0 3 0x14200 reaper reaper 78182 129001 0 0 3 0x14200 pgdaemon pagedaemon 49515 88619 0 0 3 0x14200 bored viomb 39362 396501 0 0 3 0x40014200 acpi0 acpi0 13203 510669 0 0 3 0x40014200 idle1 33370 37032 0 0 3 0x14200 bored softnet1 82747 358548 0 0 3 0x14200 bored softnet0 14316 69606 0 0 3 0x14200 bored systqmp 71542 175213 0 0 3 0x14200 bored systq 21205 188827 0 0 3 0x14200 tmoslp softclockmp 83811 485489 0 0 3 0x40014200 tmoslp softclock 99922 411546 0 0 3 0x40014200 idle0 1 167197 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 55728 (syz-executor) thread 0xffff8000373f1780 (404064) 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 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 pool_get+0x27e sys/kern/subr_pool.c:591 #3 namei+0xdf sys/kern/vfs_lookup.c:145 #4 unp_connect+0x29d sys/kern/uipc_usrreq.c:872 #5 uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 #6 sosend+0x804 sys/kern/uipc_socket.c:-1 #7 sendit+0x5a5 sys/kern/uipc_syscalls.c:785 #8 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #10 Xsyscall+0x128 exclusive rwlock sbufsnd r = 0 (0xffff800010fdede0) #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 sosend+0x2e9 sys/kern/uipc_socket.c:631 #4 sendit+0x5a5 sys/kern/uipc_syscalls.c:785 #5 sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 #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 Process 41787 (syz-executor) thread 0xffff80002a271ca0 (497197) exclusive rrwlock inode r = 0 (0xfffffd807c23cec8) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #9 Xsyscall+0x128 Process 42500 (syz-executor) thread 0xffff8000373e94e0 (358285) exclusive rrwlock inode r = 0 (0xfffffd807c23cda0) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10233 11068K 12509K 166960K 15836 0 pcb 17 18K 24K 166960K 544 0 rtable 186 10K 11K 166960K 751 0 pf 34 17K 67486K 166960K 268 0 ifaddr 34 6K 8K 166960K 181 0 ifgroup 51 2K 2K 166960K 325 0 sysctl 4 1K 9K 166960K 24 0 counters 66 36K 37K 166960K 358 0 ioctlops 0 0K 4K 166960K 1923 0 iov 0 0K 24K 166960K 254 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1554 98K 98K 166960K 4103 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 40 0 VM map 2 1K 1K 166960K 2 0 sem 15 28K 28K 166960K 92 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 2399 0 sigio 2 0K 0K 166960K 99 0 proc 72 115K 164K 166960K 912 0 subproc 72 4K 4K 166960K 135 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 629 0 in_multi 63 4K 7K 166960K 240 0 ether_multi 1 0K 0K 166960K 14 0 mrt 1 0K 0K 166960K 18 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 814 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 1K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 260 161K 179K 166960K 23124 0 UVM aobj 55 4K 5K 166960K 59 0 pinsyscall 43 86K 102K 166960K 3729 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 140 0 NDP 13 0K 1K 166960K 137 0 temp 81 8656K 8784K 166960K 103829 0 kqueue 13 20K 35K 166960K 481 0 SYN cache 2 8K 16K 166960K 3 0 ddb{0}> 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 120 196 0 193 1 0 1 1 0 8 0 rtentry 176 222 0 153 5 0 5 5 0 8 0 unpcb 144 1819 0 1801 13 12 1 6 0 8 0 syncache 336 13 0 13 4 3 1 1 0 8 1 tcpqe 32 5 0 5 2 2 0 1 0 8 0 tcpcb 736 1178 0 1172 25 18 7 13 0 8 6 arp 136 28 0 16 1 0 1 1 0 8 0 inpcb 328 3178 0 3166 28 21 7 13 0 8 5 nd6 152 44 0 34 1 0 1 1 0 8 0 pkpcb 40 17 0 17 4 3 1 1 0 8 1 kcovpl 48 15 0 7 1 0 1 1 0 8 0 mppekey 1024 4 0 4 2 1 1 1 0 8 1 ppxss 1192 116 0 116 2 1 1 1 0 8 1 pppxif 1504 11 0 11 4 3 1 1 0 8 1 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 11 0 4 1 0 1 1 0 482 0 pffrnode 88 10 0 3 1 0 1 1 0 8 0 pffrent 40 27 0 19 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 pfrktable 1344 3 0 3 3 3 0 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 320 1 0 0 1 0 1 1 0 8 0 pfstitem 24 138 0 55 1 0 1 1 0 8 0 pfstkey 128 141 0 58 3 0 3 3 0 8 0 pfstate 384 140 0 57 9 0 9 9 0 8 0 pfrule 1344 25 0 19 2 1 1 2 0 8 0 rttmr 136 3 0 3 3 3 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1019 0 747 35 15 20 30 0 8 0 art_table 40 1023 0 747 5 0 5 5 0 8 0 art_node 32 220 0 162 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 4 1 0 1 1 0 8 0 semupl 112 2 0 2 2 1 1 1 0 8 1 semapl 112 86 0 73 1 0 1 1 0 8 0 shmpl 112 56 0 4 2 0 2 2 0 8 0 dirhash 1024 36 0 19 3 0 3 3 0 8 0 dino2pl 256 5979 0 4466 96 0 96 96 0 8 0 ffsino 296 5979 0 4466 118 0 118 118 0 8 0 nchpl 144 9316 0 7608 64 0 64 64 0 8 0 rtmask 32 18 0 18 4 3 1 1 0 8 1 uvmvnodes 80 5426 0 0 111 0 111 111 0 8 0 vnodes 216 5426 0 0 302 0 302 302 0 8 0 namei 1024 33362 0 33361 4 3 1 2 0 8 0 percpumem 16 194 0 146 1 0 1 1 0 8 0 kstatmem 264 216 0 192 3 1 2 3 0 8 0 scsiplug 72 11 0 11 2 1 1 1 0 8 1 scxspl 216 72375 0 72374 12 11 1 7 1 8 0 plimitpl 152 519 0 499 1 0 1 1 0 8 0 sigapl 424 2698 0 2648 7 1 6 7 0 8 0 knotepl 120 1272 0 0 39 0 39 39 0 8 0 kqueuepl 224 867 0 857 6 5 1 3 0 8 0 pipepl 344 443 0 416 10 7 3 9 0 8 0 fdescpl 528 2673 0 2641 3 0 3 3 0 8 0 filepl 160 20573 0 20352 36 23 13 20 0 8 0 lockfpl 104 1688 0 1686 6 4 2 2 0 8 1 lockfspl 48 645 0 643 1 0 1 1 0 8 0 sessionpl 144 38 0 29 1 0 1 1 0 8 0 pgrppl 48 76 0 59 1 0 1 1 0 8 0 ucredpl 104 3653 0 3639 1 0 1 1 0 8 0 zombiepl 144 3021 0 3020 1 0 1 1 0 8 0 processpl 1232 2698 0 2648 5 1 4 5 0 8 0 procpl 664 6467 0 6405 8 2 6 7 0 8 0 sosppl 168 29 0 29 3 3 0 1 0 8 0 sockpl 752 5294 0 5261 45 34 11 22 0 8 6 mcl64k 65536 25 0 0 4 1 3 4 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 95 0 0 12 1 11 11 0 8 0 mtagpl 96 13 0 0 1 0 1 1 0 8 0 mbufpl 256 1196 0 0 75 0 75 75 0 8 0 bufpl 280 34026 0 27882 440 0 440 440 0 8 0 anonpl 32 13442 0 0 109 0 109 109 0 246 0 amapchunkpl 152 79991 0 79342 51 21 30 33 0 158 2 amappl16 200 10964 0 10892 91 73 18 29 0 8 3 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 147 0 135 1 0 1 1 0 8 0 amappl13 176 29 0 29 3 2 1 1 0 8 1 amappl12 168 3454 0 3423 3 1 2 2 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 5 0 4 2 1 1 1 0 8 0 amappl9 144 267 0 266 2 1 1 1 0 8 0 amappl8 136 33 0 29 1 0 1 1 0 8 0 amappl7 128 141 0 129 1 0 1 1 0 8 0 amappl6 120 257 0 253 1 0 1 1 0 8 0 amappl5 112 151 0 141 1 0 1 1 0 8 0 amappl4 104 346 0 323 1 0 1 1 0 8 0 amappl3 96 14276 0 14168 4 1 3 4 0 8 0 amappl2 88 2983 0 2904 2 0 2 2 0 8 0 amappl1 80 19534 0 18937 15 0 15 15 0 8 0 amappl 88 21860 0 21675 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 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 7 0 7 2 2 0 1 0 8 0 dma128 128 256 0 256 4 4 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 58 0 4 1 0 1 1 0 8 0 uaddrrnd 24 2673 0 2641 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2673 0 2641 1 0 1 1 0 8 0 vmmpekpl 168 21691 0 21640 3 0 3 3 0 8 0 vmmpepl 168 174708 0 172595 126 21 105 111 0 357 2 vmsppl 488 2672 0 2641 6 1 5 5 0 8 0 rwobjpl 80 52938 0 46443 142 1 141 142 0 8 0 pdppl 4096 5354 0 5282 116 42 74 84 0 8 2 pvpl 32 21944 0 0 177 0 177 177 0 265 0 pmappl 256 2672 0 2641 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 405 0 88 10 0 10 10 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:438 witness_checkorder(fffffd807c23c6b0,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd807c23c698,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd807c23c698,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8069da97e0,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd8069da97e0,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vfs_lookup(ffff80003c452050) at vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 namei(ffff80003c452050) at namei+0x7ca sys/kern/vfs_lookup.c:250 unp_connect(ffff800010fdebf8,fffffd805e335d00,ffff8000373f1780) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872 uipc_dgram_send(ffff800010fdebf8,fffffd805eeb3600,fffffd805e335d00,0) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609 sosend(ffff800010fdebf8,fffffd805e335d00,ffff80003c4522d8,0,0,c) at sosend+0x804 sys/kern/uipc_socket.c:-1 sendit(ffff8000373f1780,3,ffff80003c452458,c,ffff80003c452510) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785 sys_sendmsg(ffff8000373f1780,ffff80003c4525c0,ffff80003c452510) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603 syscall(ffff80003c4525c0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4525c0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdcf59cf38e0, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x38 sys/dev/kcov.c:-1 __mp_lock(ffffffff83915db8) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83915db8) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff83915db8,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 pool_get(ffffffff839a7558,9) at pool_get+0x27e sys/kern/subr_pool.c:591 buf_get(fffffd805beb00f8,3a,4000) at buf_get+0x37d sys/kern/vfs_bio.c:-1 getblk(fffffd805beb00f8,3a,4000,0,ffffffffffffffff) at getblk+0x146 sys/kern/vfs_bio.c:-1 ffs2_balloc(fffffd807c23ce28,e8000,4000,fffffd80097fb618,2,ffff80003c44c128) at ffs2_balloc+0x179c sys/ufs/ffs/ffs_balloc.c:-1 ffs_write(ffff80003c44c1b0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd805beb00f8,ffff80003c44c368,7,fffffd80097fb618) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806b8f4358,ffff80003c44c368,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80002a271ca0,4,ffff80003c44c368,0,ffff80003c44c420) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff80002a271ca0,ffff80003c44c4d0,ffff80003c44c420) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80003c44c4d0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c44c4d0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc1c7bcb0300, count: -17