witness: lock order reversal: 1st 0xffff8000347ae280 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806fd54e98 inode (&ip->i_lock) lock order [1] fdlock (&newfdp->fd_fd.fd_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff83432111 -> 0xffffffff834204e3 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:890 #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+0xdfc 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:783 #12 Xsyscall+0x128 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] fdlock (&newfdp->fd_fd.fd_lock) #0 rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 #1 unp_externalize+0x3cf sys/kern/uipc_usrreq.c:1074 #2 soreceive+0xc24 sys/kern/uipc_socket.c:1029 #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:783 #6 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(fffffd806fd54e98,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806fd54e80,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806fd54e80,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd806fe5b448,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd806fe5b448,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd805f4dcd80,ffff8000fffe6558) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805f4dcd80,ffff8000fffe6558) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd805f4dcd80,ffff8000fffe6558) at fdrop+0x121 sys/kern/kern_descrip.c:1281 knote_drop(fffffd805dfc05b0,ffff8000fffe6558) at knote_drop+0x1a1 sys/kern/kern_event.c:2296 knote_remove(ffff8000fffe6558,fffffd806f5488c0,fffffd806f548950,3,0) at knote_remove+0x215 sys/kern/kern_event.c:-1 knote_fdclose(ffff8000fffe6558,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203 fdrelease(ffff8000fffe6558,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:761 syscall(ffff80003afe8290) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003afe8290) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb5127fddcf0, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003afe7d50 rbx 0 rdx 0xffff8000015ef980 rcx 0xffff8000fffe6558 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003afe7c30 r9 0x8080808080808080 r10 0x24de1098bc8d4df7 r11 0x6b6f3f1e6a971870 r12 0xfffffd8004037d00 r13 0xfffffd80048245f8 r14 0x3 r15 0xffffffff834b5424 substchar+0xb7c1 rip 0xffffffff8229bed5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003afe7d40 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=210377 pid=14423 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=85, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffe6d20,0xffff80002a241250 process=0xffff8000fffe8020 user=0xffff80003afe3000, vmspace=0xfffffd806c6a6d78 estcpu=35, cpticks=15, pctcpu=0.0, user=0, sys=14, intr=1 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 87540 67854 93246 0 2 0 syz-executor 2842 205996 61070 0 2 0 syz-executor 2842 446831 61070 0 3 0x4000080 fsleep syz-executor 2842 312635 61070 0 3 0x4000080 fsleep syz-executor 11436 135052 33555 0 3 0 vmmaplk syz-executor 11436 46738 33555 0 3 0x4000080 ttyout syz-executor 11436 10059 33555 0 2 0x4000000 syz-executor 38853 356144 3060 0 7 0 syz-executor 38853 211050 3060 0 3 0x4000080 ttyout syz-executor 38853 272037 3060 0 3 0x4000080 ttybg syz-executor 14423 405395 17336 0 2 0 syz-executor *14423 210377 17336 0 7 0x4000000 syz-executor 14423 134413 17336 0 3 0x4000080 fsleep syz-executor 68546 170960 80487 0 3 0x80 nanoslp syz-executor 68546 213538 80487 0 3 0x4000080 fifow syz-executor 68546 98800 80487 0 3 0x4000080 fsleep syz-executor 68546 422526 80487 0 3 0x4000080 fsleep syz-executor 40087 216078 66485 0 3 0x90 nanoslp syz-executor 40087 252019 66485 0 3 0x4000090 msgwait syz-executor 40087 410963 66485 0 3 0x4000090 fsleep syz-executor 60087 188767 0 0 3 0x14200 acct acct 28576 105168 0 0 3 0x14280 nfsidl nfsio 87133 213883 0 0 3 0x14280 nfsidl nfsio 51331 63196 0 0 3 0x14280 nfsidl nfsio 94501 395705 27364 0 3 0x82 wait syz-executor 31624 73261 1 0 3 0x100083 ttyopn getty 3060 321168 27364 0 3 0x82 nanoslp syz-executor 93246 212616 27364 0 3 0x82 nanoslp syz-executor 66485 209996 27364 0 3 0x82 nanoslp syz-executor 17336 515305 27364 0 3 0x82 nanoslp syz-executor 80487 318465 27364 0 3 0x82 nanoslp syz-executor 61070 220907 27364 0 3 0x82 nanoslp syz-executor 33555 495997 27364 0 3 0x82 nanoslp syz-executor 27364 29317 88647 0 3 0x82 kqread syz-executor 88647 296120 57819 0 3 0x10008a sigsusp ksh 57819 125718 1337 0 3 0x98 kqread sshd-session 1337 467176 81382 0 3 0x92 kqread sshd-session 81382 369257 1 0 3 0x88 kqread sshd 2394 281022 33823 74 3 0x1100092 bpf pflogd 33823 463975 1 0 3 0x80 sbwait pflogd 27426 248190 95906 73 3 0x1100090 kqread syslogd 95906 484074 1 0 3 0x100082 sbwait syslogd 89080 322264 1 0 3 0x100080 kqread resolvd 18571 235052 91489 77 3 0x100092 kqread dhcpleased 98489 212997 91489 77 3 0x100092 kqread dhcpleased 91489 139566 1 0 3 0x80 kqread dhcpleased 86336 105413 0 0 3 0x14200 bored smr 63806 375605 0 0 2 0x14200 zerothread 47179 89497 0 0 3 0x14200 aiodoned aiodoned 60678 172711 0 0 3 0x14200 syncer update 14491 126954 0 0 3 0x14200 cleaner cleaner 57483 171852 0 0 3 0x14200 reaper reaper 61409 250195 0 0 3 0x14200 pgdaemon pagedaemon 19051 29766 0 0 3 0x14200 bored viomb 77446 315956 0 0 3 0x40014200 acpi0 acpi0 45702 301901 0 0 3 0x40014200 idle1 21385 484826 0 0 3 0x14200 bored softnet1 58713 71492 0 0 3 0x14200 bored softnet0 77658 324801 0 0 3 0x14200 bored systqmp 67905 30499 0 0 3 0x14200 bored systq 28426 226270 0 0 3 0x14200 tmoslp softclockmp 63746 347471 0 0 3 0x40014200 tmoslp softclock 11827 419507 0 0 3 0x40014200 idle0 1 120160 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 11436 (syz-executor) thread 0xffff8000347b0550 (10059) exclusive rwlock vmmaplk r = 0 (0xfffffd806c6a64f0) #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:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 Process 14423 (syz-executor) thread 0xffff8000fffe6558 (210377) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839ad400) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:608 #2 fdrop+0x121 sys/kern/kern_descrip.c:1281 #3 knote_drop+0x1a1 sys/kern/kern_event.c:2296 #4 knote_remove+0x215 sys/kern/kern_event.c:-1 #5 knote_fdclose+0xf9 sys/kern/kern_event.c:2203 #6 fdrelease+0xf9 sys/kern/kern_descrip.c:761 #7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #8 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xffff8000347ae280) #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 sys_close+0xd0 sys/kern/kern_descrip.c:779 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #4 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11068 12091K 12317K 166960K 12851 0 pcb 19 14K 16K 166960K 168 0 rtable 276 12K 13K 166960K 470 0 pf 38 18K 82K 166960K 98 0 ifaddr 44 7K 8K 166960K 69 0 ifgroup 58 2K 2K 166960K 101 0 sysctl 3 1K 9K 166960K 10 0 counters 70 37K 37K 166960K 190 0 ioctlops 0 0K 4K 166960K 1606 0 iov 0 0K 28K 166960K 25 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1353 85K 86K 166960K 1833 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 90 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 232K 166960K 639 0 sigio 1 0K 0K 166960K 51 0 proc 75 131K 164K 166960K 634 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 64 0 in_multi 98 7K 7K 166960K 125 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 20 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 485 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 253 168K 195K 166960K 7536 0 UVM aobj 12 6K 6K 166960K 13 0 pinsyscall 43 86K 102K 166960K 1873 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 41 0 NDP 12 0K 2K 166960K 46 0 temp 56 9082K 9148K 166960K 25585 0 kqueue 15 24K 28K 166960K 102 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 69 0 66 1 0 1 1 0 8 0 rtentry 176 134 0 18 6 0 6 6 0 8 0 unpcb 144 276 0 254 2 1 1 2 0 8 0 syncache 336 8 0 8 2 2 0 1 0 8 0 tcpqe 32 7 0 7 1 1 0 1 0 8 0 tcpcb 736 120 0 113 3 2 1 2 0 8 0 arp 136 22 0 3 1 0 1 1 0 8 0 inpcb 328 628 0 612 9 7 2 7 0 8 0 nd6 152 30 0 3 2 0 2 2 0 8 0 pkpcb 40 4 0 4 2 2 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 56 0 56 2 2 0 1 0 8 0 pppxif 1504 1 0 1 1 1 0 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 3 0 1 1 0 1 1 0 482 0 pffrnode 88 3 0 1 1 0 1 1 0 8 0 pffrent 40 5 0 3 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 1 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 45 0 11 1 0 1 1 0 8 0 pfstkey 128 46 0 12 2 0 2 2 0 8 0 pfstate 448 46 0 12 5 0 5 5 0 8 0 pfrule 1360 26 0 20 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 526 0 58 30 0 30 30 0 8 0 art_table 40 529 0 58 5 0 5 5 0 8 0 art_node 32 134 0 30 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semapl 112 87 0 77 1 0 1 1 0 8 0 shmpl 112 8 0 1 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2557 0 1095 93 0 93 93 0 8 0 ffsino 296 2557 0 1095 114 0 114 114 0 8 0 nchpl 144 3383 0 1675 64 0 64 64 0 8 0 rtmask 32 8 0 8 2 2 0 1 0 8 0 vnodes 216 2886 0 0 161 0 161 161 0 8 0 namei 1024 11369 0 11369 4 3 1 2 0 8 1 percpumem 16 110 0 60 1 0 1 1 0 8 0 vcpupl 3968 2 0 0 1 0 1 1 0 8 0 vmpool 848 2 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0 kstatmem 264 58 0 32 3 1 2 3 0 8 0 scxspl 216 22473 0 22473 12 11 1 8 1 8 1 plimitpl 152 160 0 140 1 0 1 1 0 8 0 sigapl 424 967 0 915 7 1 6 7 0 8 0 knotepl 120 311 0 0 10 0 10 10 0 8 0 kqueuepl 224 171 0 160 1 0 1 1 0 8 0 pipepl 344 173 0 145 3 0 3 3 0 8 0 fdescpl 528 941 0 909 3 0 3 3 0 8 0 filepl 160 4941 0 4704 14 3 11 14 0 8 0 lockfpl 104 137 0 134 1 0 1 1 0 8 0 lockfspl 48 60 0 57 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 43 0 26 1 0 1 1 0 8 0 ucredpl 104 605 0 591 1 0 1 1 0 8 0 zombiepl 144 976 0 975 2 1 1 1 0 8 0 processpl 1232 967 0 915 5 0 5 5 0 8 0 procpl 664 1818 0 1753 6 0 6 6 0 8 0 sosppl 176 9 0 7 3 2 1 1 0 8 0 sockpl 752 989 0 948 14 9 5 10 0 8 0 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 125 0 0 16 0 16 16 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 207 0 0 13 0 13 13 0 8 0 bufpl 280 9081 0 2951 439 0 439 439 0 8 0 anonpl 32 11950 0 0 97 0 97 97 0 246 0 amapchunkpl 152 24997 0 24463 41 15 26 36 0 158 5 amappl16 200 3403 0 3347 42 37 5 27 0 8 0 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 451 0 450 1 0 1 1 0 8 0 amappl13 176 139 0 126 1 0 1 1 0 8 0 amappl12 168 1210 0 1179 2 0 2 2 0 8 0 amappl11 160 39 0 39 1 1 0 1 0 8 0 amappl10 152 61 0 47 1 0 1 1 0 8 0 amappl9 144 267 0 266 1 0 1 1 0 8 0 amappl8 136 113 0 111 1 0 1 1 0 8 0 amappl7 128 162 0 149 1 0 1 1 0 8 0 amappl6 120 173 0 171 1 0 1 1 0 8 0 amappl5 112 114 0 104 1 0 1 1 0 8 0 amappl4 104 314 0 294 1 0 1 1 0 8 0 amappl3 96 4753 0 4630 4 0 4 4 0 8 0 amappl2 88 612 0 552 2 0 2 2 0 8 0 amappl1 80 13724 0 13115 17 3 14 17 0 8 0 amappl 88 6639 0 6460 5 0 5 5 0 92 0 uvmvnodes 80 115 0 0 3 0 3 3 0 8 0 dma65536 65536 2 0 2 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 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 2 2 0 1 0 8 0 dma64 64 7 0 7 2 1 1 1 0 8 1 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 12 0 1 1 0 1 1 0 8 0 uaddrrnd 24 941 0 909 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 941 0 909 1 0 1 1 0 8 0 vmmpekpl 168 9871 0 9827 3 0 3 3 0 8 0 vmmpepl 168 69807 0 67791 121 28 93 108 0 357 2 vmsppl 488 940 0 909 5 0 5 5 0 8 0 rwobjpl 80 22534 0 21427 35 7 28 32 0 8 0 pdppl 4096 1893 0 1820 110 37 73 83 0 8 0 pvpl 32 20392 0 0 166 1 165 165 0 265 0 pmappl 256 942 0 909 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 297 0 49 8 0 8 8 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(fffffd806fd54e98,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806fd54e80,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806fd54e80,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd806fe5b448,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd806fe5b448,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd805f4dcd80,ffff8000fffe6558) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805f4dcd80,ffff8000fffe6558) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd805f4dcd80,ffff8000fffe6558) at fdrop+0x121 sys/kern/kern_descrip.c:1281 knote_drop(fffffd805dfc05b0,ffff8000fffe6558) at knote_drop+0x1a1 sys/kern/kern_event.c:2296 knote_remove(ffff8000fffe6558,fffffd806f5488c0,fffffd806f548950,3,0) at knote_remove+0x215 sys/kern/kern_event.c:-1 knote_fdclose(ffff8000fffe6558,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203 fdrelease(ffff8000fffe6558,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:761 syscall(ffff80003afe8290) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003afe8290) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb5127fddcf0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299bdff0) 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+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(ffffffff839acc00) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839acc00) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 syscall(ffff80002a352b80) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002a352b80) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7839ce23ceb0, count: -7