witness: lock order reversal: 1st 0xffff8000fffeaac0 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806e2500f0 inode (&ip->i_lock) lock order [1] fdlock (&newfdp->fd_fd.fd_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff833525b3 -> 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] 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:1009 #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:746 #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(fffffd806e2500f0,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806e2500d8,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806e2500d8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd806e24f708,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd806e24f708,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd807dc2cb58,ffff80003c422fb8) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd807dc2cb58,ffff80003c422fb8) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd807dc2cb58,ffff80003c422fb8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 knote_drop(fffffd805f267b50,ffff80003c422fb8) at knote_drop+0x1a1 sys/kern/kern_event.c:2296 knote_remove(ffff80003c422fb8,fffffd80655372c8,fffffd8065537358,3,0) at knote_remove+0x2f6 sys/kern/kern_event.c:2180 knote_fdclose(ffff80003c422fb8,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203 fdrelease(ffff80003c422fb8,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:760 syscall(ffff80003a7f5fe0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a7f5fe0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x13e77b04c20, count: -14 ddb{0}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003a7f5ab0 rbx 0 rdx 0xffff80000145cd00 rcx 0xffff80003c422fb8 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003a7f5990 r9 0x8080808080808080 r10 0x5a02b8a24ee2d3a9 r11 0x296383151a1b20a1 r12 0xfffffd8003efac80 r13 0xfffffd80046e6d78 r14 0x3 r15 0xffffffff833e2b64 substchar+0xf1da rip 0xffffffff831577a5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003a7f5aa0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=130051 pid=61022 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=0xffff80003c423a18,0xffff8000fffe9788 process=0xffff8000ffff3500 user=0xffff80003a7f1000, vmspace=0xfffffd806714c030 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 36851 358202 10729 0 3 0x3000 suspend syz-executor 36851 448475 10729 0 2 0x4081080 syz-executor 36851 321619 10729 0 2 0x4081000 syz-executor 36851 476737 10729 0 2 0x4081000 syz-executor 26649 311395 4942 0 2 0 syz-executor 26649 273473 4942 0 3 0x4000080 fsleep syz-executor 51975 488243 17171 0 3 0x10008a sigsusp sh 29097 309816 71136 0 2 0 syz-executor 53998 156845 85618 0 2 0 syz-executor 53998 162976 85618 0 2 0x4000000 syz-executor 61022 140682 51364 0 2 0 syz-executor *61022 130051 51364 0 7 0x4000000 syz-executor 17171 81322 64239 0 3 0x82 wait syz-executor 12404 408626 26683 0 3 0x80 nanoslp syz-executor 12404 223087 26683 0 2 0x4000000 syz-executor 12404 335464 26683 0 3 0x4000080 fsleep syz-executor 20594 26916 2686 0 3 0x80 nanoslp syz-executor 20594 504283 2686 0 3 0x4000080 kqsel syz-executor 20594 108462 2686 0 3 0x4000080 fsleep syz-executor 48409 382864 0 0 3 0x14200 acct acct 4942 136726 64239 0 3 0x82 nanoslp syz-executor 7110 268840 1 0 3 0x100083 ttyin getty 77874 448549 0 0 3 0x14200 bored sosplice 71136 73825 64239 0 2 0x2 syz-executor 2686 64854 64239 0 3 0x82 nanoslp syz-executor 85618 105852 64239 0 3 0x82 nanoslp syz-executor 26683 2102 64239 0 3 0x82 nanoslp syz-executor 51364 228506 64239 0 3 0x82 nanoslp syz-executor 10729 320362 64239 0 3 0x82 nanoslp syz-executor 64239 300316 95372 0 3 0x82 kqread syz-executor 95372 232062 29721 0 3 0x10008a sigsusp ksh 29721 496959 75234 0 3 0x98 kqread sshd-session 75234 181275 7130 0 3 0x92 kqread sshd-session 7130 25078 1 0 3 0x88 kqread sshd 69186 486099 14284 74 3 0x1100092 bpf pflogd 14284 470156 1 0 3 0x80 sbwait pflogd 73031 431305 62857 73 3 0x1100090 kqread syslogd 62857 196298 1 0 3 0x100082 sbwait syslogd 80687 227068 1 0 3 0x100080 kqread resolvd 18184 329322 15387 77 3 0x100092 kqread dhcpleased 93085 109990 15387 77 3 0x100092 kqread dhcpleased 15387 254570 1 0 3 0x80 kqread dhcpleased 39674 391651 0 0 3 0x14200 bored smr 60817 492043 0 0 2 0x14200 zerothread 78759 93026 0 0 3 0x14200 aiodoned aiodoned 29124 369562 0 0 3 0x14200 syncer update 24513 344724 0 0 3 0x14200 cleaner cleaner 50527 172065 0 0 2 0x14200 reaper 59816 253472 0 0 3 0x14200 pgdaemon pagedaemon 52282 283776 0 0 3 0x14200 bored viomb 65349 218872 0 0 3 0x40014200 acpi0 acpi0 60032 463517 0 0 3 0x40014200 idle1 49118 183182 0 0 3 0x14200 bored softnet1 646 232493 0 0 3 0x14200 bored softnet0 15973 382586 0 0 3 0x14200 smrbar systqmp 92604 440070 0 0 3 0x14200 bored systq 26849 487299 0 0 3 0x14200 tmoslp softclockmp 82803 116483 0 0 3 0x40014200 tmoslp softclock 7885 398206 0 0 3 0x40014200 idle0 1 64503 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 61022 (syz-executor) thread 0xffff80003c422fb8 (130051) 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 vn_closefile+0x41 sys/kern/vfs_vnops.c:608 #2 fdrop+0x121 sys/kern/kern_descrip.c:1280 #3 knote_drop+0x1a1 sys/kern/kern_event.c:2296 #4 knote_remove+0x2f6 sys/kern/kern_event.c:2180 #5 knote_fdclose+0xf9 sys/kern/kern_event.c:2203 #6 fdrelease+0xf9 sys/kern/kern_descrip.c:760 #7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #8 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xffff8000fffeaac0) #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:778 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #4 Xsyscall+0x128 Process 12404 (syz-executor) thread 0xffff80003c4222c0 (223087) exclusive rrwlock inode r = 0 (0xfffffd8079317120) #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 15973 (systqmp) thread 0xffff8000ffffe530 (382586) shared rwlock systqmp r = 0 (0xffffffff837992e8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10223 11092K 11461K 166960K 12462 0 pcb 18 16K 18K 166960K 244 0 rtable 172 9K 9K 166960K 390 0 pf 30 16K 18K 166960K 112 0 ifaddr 35 6K 7K 166960K 91 0 ifgroup 47 2K 2K 166960K 132 0 sysctl 4 1K 9K 166960K 11 0 counters 64 36K 37K 166960K 292 0 ioctlops 0 0K 8K 166960K 1745 0 iov 0 0K 26K 166960K 108 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1425 90K 90K 166960K 2125 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 11 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 84 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 828 0 sigio 0 0K 0K 166960K 82 0 proc 73 115K 180K 166960K 649 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 151 0 in_multi 77 5K 7K 166960K 149 0 ether_multi 1 0K 0K 166960K 7 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 223 996K 996K 166960K 223 0 exec 0 0K 1K 166960K 476 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 240 168K 182K 166960K 9348 0 UVM aobj 17 2K 2K 166960K 18 0 pinsyscall 43 86K 104K 166960K 1957 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 46 0 NDP 12 0K 2K 166960K 62 0 temp 79 8656K 8728K 166960K 43197 0 kqueue 14 22K 34K 166960K 148 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 73 0 70 1 0 1 1 0 8 0 rtentry 176 130 0 64 5 0 5 5 0 8 0 unpcb 144 678 0 660 12 6 6 6 0 8 5 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 335 0 330 12 5 7 7 0 8 6 arp 136 15 0 6 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 3 0 3 1 0 1 1 0 8 1 inpcb 328 1246 0 1236 23 11 12 12 0 8 10 nd6 152 21 0 9 1 0 1 1 0 8 0 pkpcb 40 2 0 2 2 2 0 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 105 0 105 2 1 1 1 0 8 1 pppxif 1504 3 0 3 2 2 0 1 0 8 0 pffrag 232 7 0 1 1 0 1 1 0 482 0 pffrnode 88 7 0 1 1 0 1 1 0 8 0 pffrent 40 17 0 11 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 1 0 1 1 1 0 1 0 8 0 pfstitem 24 43 0 12 1 0 1 1 0 8 0 pfstkey 128 43 0 12 2 0 2 2 0 8 0 pfstate 384 43 0 12 4 0 4 4 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 605 0 257 28 5 23 28 0 8 1 art_table 40 607 0 257 5 0 5 5 0 8 0 art_node 32 128 0 70 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 81 0 71 1 0 1 1 0 8 0 shmpl 112 15 0 1 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2891 0 1384 96 0 96 96 0 8 0 ffsino 296 2891 0 1384 118 0 118 118 0 8 0 nchpl 144 4088 0 2394 64 0 64 64 0 8 0 rtmask 32 9 0 9 2 1 1 1 0 8 1 uvmvnodes 80 3445 0 0 71 0 71 71 0 8 0 vnodes 216 3445 0 0 192 0 192 192 0 8 0 namei 1024 14762 0 14762 3 2 1 2 0 8 1 percpumem 16 161 0 114 1 0 1 1 0 8 0 kstatmem 264 86 0 64 3 1 2 3 0 8 0 scsiplug 72 5 0 5 3 2 1 1 0 8 1 scxspl 216 22142 0 22142 15 7 8 8 1 8 8 plimitpl 152 309 0 290 1 0 1 1 0 8 0 sigapl 424 1124 0 1073 7 1 6 7 0 8 0 knotepl 120 570 0 0 18 0 18 18 0 8 0 kqueuepl 224 385 0 373 6 4 2 5 0 8 0 pipepl 344 158 0 131 3 0 3 3 0 8 0 fdescpl 528 1105 0 1073 3 0 3 3 0 8 0 filepl 160 8019 0 7792 32 12 20 20 0 8 7 lockfpl 104 500 0 496 2 1 1 2 0 8 0 lockfspl 48 236 0 232 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 39 0 22 1 0 1 1 0 8 0 ucredpl 104 1012 0 999 1 0 1 1 0 8 0 zombiepl 144 1075 0 1073 1 0 1 1 0 8 0 processpl 1232 1124 0 1073 5 1 4 5 0 8 0 procpl 664 2303 0 2241 6 0 6 6 0 8 0 sosppl 168 7 0 7 2 1 1 1 0 8 1 sockpl 752 2081 0 2050 41 24 17 20 0 8 12 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 1182 0 0 74 0 74 74 0 8 0 bufpl 280 10199 0 4056 439 0 439 439 0 8 0 anonpl 32 11737 0 0 95 0 95 95 0 246 0 amapchunkpl 152 30960 0 30470 40 10 30 30 0 158 8 amappl16 200 3967 0 3899 35 21 14 27 0 8 8 amappl15 192 7 0 6 1 0 1 1 0 8 0 amappl14 184 117 0 105 1 0 1 1 0 8 0 amappl13 176 8 0 8 1 1 0 1 0 8 0 amappl12 168 1776 0 1743 3 1 2 2 0 8 0 amappl11 160 53 0 38 1 0 1 1 0 8 0 amappl10 152 2 0 2 1 1 0 1 0 8 0 amappl9 144 254 0 254 1 1 0 1 0 8 0 amappl8 136 25 0 21 1 0 1 1 0 8 0 amappl7 128 114 0 102 1 0 1 1 0 8 0 amappl6 120 193 0 189 1 0 1 1 0 8 0 amappl5 112 131 0 121 1 0 1 1 0 8 0 amappl4 104 310 0 289 1 0 1 1 0 8 0 amappl3 96 5194 0 5095 4 1 3 3 0 8 0 amappl2 88 1347 0 1267 2 0 2 2 0 8 0 amappl1 80 11144 0 10529 16 3 13 15 0 8 0 amappl 88 8523 0 8358 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 0 1 1 0 8 1 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 128 255 0 255 3 3 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 17 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1105 0 1073 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1105 0 1073 1 0 1 1 0 8 0 vmmpekpl 168 9956 0 9914 3 0 3 3 0 8 0 vmmpepl 168 74391 0 72338 113 6 107 111 0 357 11 vmsppl 488 1104 0 1072 7 2 5 5 0 8 0 rwobjpl 80 25191 0 20739 93 1 92 92 0 8 0 pdppl 4096 2218 0 2144 108 34 74 86 0 8 0 pvpl 32 18844 0 0 153 1 152 153 0 265 0 pmappl 256 1104 0 1072 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 356 0 50 9 0 9 9 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(fffffd806e2500f0,9,0) at witness_checkorder+0x10b9 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd806e2500d8,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd806e2500d8,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd806e24f708,2001) at VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 vn_lock(fffffd806e24f708,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd807dc2cb58,ffff80003c422fb8) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd807dc2cb58,ffff80003c422fb8) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd807dc2cb58,ffff80003c422fb8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 knote_drop(fffffd805f267b50,ffff80003c422fb8) at knote_drop+0x1a1 sys/kern/kern_event.c:2296 knote_remove(ffff80003c422fb8,fffffd80655372c8,fffffd8065537358,3,0) at knote_remove+0x2f6 sys/kern/kern_event.c:2180 knote_fdclose(ffff80003c422fb8,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203 fdrelease(ffff80003c422fb8,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:760 syscall(ffff80003a7f5fe0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a7f5fe0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x13e77b04c20, count: -14 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+0xf kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:153 exit1(ffff80002a277ca0,0,0,1) at exit1+0x701 sys/kern/kern_exit.c:260 sys_exit(ffff80002a277ca0,ffff80003c435a90,ffff80003c4359e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c435a90) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c435a90) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c7db140ed40, count: -8