panic: vrele: v_writecount != 0 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 65669 39063 0 0x1004 0 1K syz-executor 55892 64128 0 0x14000 0x40000200 0 softclock db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344bdd9) at panic+0x1e5 sys/kern/subr_prf.c:198 vrele(fffffd806d4f62b8) at vrele+0x274 sys/kern/vfs_subr.c:831 uvn_detach(fffffd806d479980) at uvn_detach+0x1b7 sys/uvm/uvm_vnode.c:391 uvm_unmap_detach(ffff80002a329c98,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvmspace_exec(ffff80002a2aaf78,1000,7f7fffffc000) at uvmspace_exec+0x3b7 sys/uvm/uvm_map.c:3393 sys_execve(ffff80002a2aaf78,ffff80002a32a330,ffff80002a32a280) at sys_execve+0xae0 sys/kern/kern_exec.c:453 syscall(ffff80002a32a330) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a32a330) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70b67a34c350, count: 6 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: vrele: v_writecount != 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344bdd9) at panic+0x1e5 sys/kern/subr_prf.c:198 vrele(fffffd806d4f62b8) at vrele+0x274 sys/kern/vfs_subr.c:831 uvn_detach(fffffd806d479980) at uvn_detach+0x1b7 sys/uvm/uvm_vnode.c:391 uvm_unmap_detach(ffff80002a329c98,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvmspace_exec(ffff80002a2aaf78,1000,7f7fffffc000) at uvmspace_exec+0x3b7 sys/uvm/uvm_map.c:3393 sys_execve(ffff80002a2aaf78,ffff80002a32a330,ffff80002a32a280) at sys_execve+0xae0 sys/kern/kern_exec.c:453 syscall(ffff80002a32a330) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a32a330) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70b67a34c350, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a329ae0 rbx 0xffff8000299dedd7 rdx 0 rcx 0xffff80002a2aaf78 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x2a9e606f7557bff6 r11 0x5ce548479013f41 r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff81ba9385 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a329ad0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=65669 pid=39063 tcnt=1 stat=onproc flags process=1004 proc=0 runpri=50, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a2aaf78 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2aa018,0xffff80002a2abc58 process=0xffff8000ffff66c8 user=0xffff80002a325000, vmspace=0xfffffd806c176990 estcpu=36, cpticks=3, pctcpu=0.0, user=0, sys=3, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 73826 112612 56188 32767 2 0x10 syz-executor *39063 65669 40719 0 7 0x1004 syz-executor 24527 306236 50066 32767 2 0x10 syz-executor 24527 403540 50066 32767 3 0x4000010 getblk syz-executor 24527 396024 50066 32767 3 0x4000090 fsleep syz-executor 89211 183229 32015 32767 3 0x90 piperd syz-executor 32015 326166 40719 0 3 0x82 wait syz-executor 21801 123954 0 0 3 0x14200 bored sosplice 43827 400440 11762 0 3 0x82 sbwait sshd-session 44896 483938 80170 32767 3 0x90 piperd syz-executor 61289 415189 17582 32767 3 0x90 piperd syz-executor 17405 70883 76673 32767 2 0x10 syz-executor 56188 336069 77045 32767 3 0x90 nanoslp syz-executor 50066 35637 92125 32767 3 0x90 nanoslp syz-executor 80170 331389 40719 0 3 0x82 wait syz-executor 76673 255244 40719 0 3 0x82 wait syz-executor 17582 392189 40719 0 3 0x82 wait syz-executor 77045 417181 40719 0 3 0x82 wait syz-executor 92125 47294 40719 0 3 0x82 wait syz-executor 40719 227308 74095 0 3 0x82 nanoslp syz-executor 74095 429576 88227 0 3 0x10008a sigsusp ksh 88227 446266 24928 0 3 0x98 kqread sshd-session 24928 415620 11762 0 3 0x92 kqread sshd-session 70218 159780 1 0 3 0x100083 ttyin getty 11762 510164 1 0 3 0x88 kqread sshd 36830 188808 38676 73 3 0x1100090 kqread syslogd 38676 180742 1 0 3 0x100082 sbwait syslogd 96072 338009 1 0 3 0x100080 kqread resolvd 68418 132739 64363 77 3 0x100092 kqread dhcpleased 13575 420014 64363 77 3 0x100092 kqread dhcpleased 64363 232418 1 0 3 0x80 kqread dhcpleased 24038 214766 0 0 3 0x14200 bored smr 41420 56118 0 0 2 0x14200 zerothread 6273 32380 0 0 3 0x14200 aiodoned aiodoned 45828 261806 0 0 3 0x14200 syncer update 10650 200428 0 0 3 0x14200 cleaner cleaner 20008 378146 0 0 3 0x14200 reaper reaper 39240 265200 0 0 3 0x14200 pgdaemon pagedaemon 82090 290324 0 0 3 0x14200 bored viomb 76751 152672 0 0 3 0x40014200 acpi0 acpi0 15850 380759 0 0 3 0x40014200 idle1 81127 347123 0 0 3 0x14200 bored softnet3 74 343612 0 0 3 0x14200 bored softnet2 45963 325104 0 0 3 0x14200 bored softnet1 60540 514432 0 0 3 0x14200 bored softnet0 29049 83003 0 0 3 0x14200 bored systqmp 46429 44689 0 0 3 0x14200 bored systq 15236 65395 0 0 3 0x14200 tmoslp softclockmp 64128 55892 0 0 7 0x40014200 softclock 6991 453980 0 0 3 0x40014200 idle0 1 8915 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 39063 (syz-executor) thread 0xffff80002a2aaf78 (65669) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff839628a8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #1 syscall+0xae6 sys/arch/amd64/amd64/trap.c:579 #2 Xsyscall+0x128 Process 24527 (syz-executor) thread 0xffff80002a2aa2a8 (403540) exclusive rrwlock inode r = 0 (0xfffffd806dea5c08) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2bd sys/kern/vfs_subr.c:693 #6 ffs_sync_vnode+0x1aa sys/ufs/ffs/ffs_vfsops.c:1076 #7 vfs_mount_foreach_vnode+0x65 sys/kern/vfs_subr.c:-1 #8 ffs_sync+0x146 sys/ufs/ffs/ffs_vfsops.c:1131 #9 sys_sync+0x104 sys/kern/vfs_syscalls.c:535 #10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #11 Xsyscall+0x128 shared rwlock vfslock r = 0 (0xffff800000b49860) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:397 #2 vfs_busy+0x94 sys/kern/vfs_subr.c:246 #3 sys_sync+0x5d sys/kern/vfs_syscalls.c:528 #4 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #5 Xsyscall+0x128 Process 17405 (syz-executor) thread 0xffff8000ffff1210 (70883) exclusive rrwlock inode r = 0 (0xfffffd8067b20528) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3109 #10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cc1d8b8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3094 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10210 10954K 10966K 166960K 11298 0 pcb 17 14K 16K 166960K 19 0 rtable 194 5K 7K 166960K 480 0 pf 27 16K 16K 166960K 33 0 ifaddr 34 6K 7K 166960K 48 0 ifgroup 42 1K 2K 166960K 54 0 sysctl 4 1K 9K 166960K 9 0 counters 64 36K 36K 166960K 70 0 ioctlops 0 0K 2K 166960K 43 0 iov 0 0K 24K 166960K 28 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1683 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 40 0 dirhash 12 2K 2K 166960K 33 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 58K 121K 166960K 664 0 sigio 0 0K 0K 166960K 6 0 proc 58 79K 115K 166960K 575 0 subproc 54 3K 4K 166960K 315 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 80 0 in_multi 77 5K 7K 166960K 127 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 1 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 1 0K 1K 166960K 426 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 194 150K 190K 166960K 7187 0 UVM aobj 18 2K 2K 166960K 18 0 pinsyscall 41 82K 112K 166960K 1759 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 31 0 NDP 11 0K 2K 166960K 30 0 temp 58 8685K 8809K 166960K 6491 0 kqueue 13 20K 29K 166960K 106 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 84 0 81 1 0 1 1 0 8 0 rtentry 176 129 0 39 6 0 6 6 0 8 0 unpcb 144 503 0 486 4 3 1 4 0 8 0 syncache 336 16 0 16 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 808 316 0 309 8 6 2 8 0 8 1 arp 128 20 0 6 1 0 1 1 0 8 0 ipq 40 2 0 1 1 0 1 1 0 8 0 ipqe 40 4 0 3 1 0 1 1 0 8 0 inpcb 328 850 0 839 16 8 8 16 0 8 6 nd6 144 34 0 14 2 0 2 2 0 8 1 kcovpl 48 35 0 29 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 515 0 145 30 1 29 30 0 8 5 art_table 32 516 0 145 4 0 4 4 0 8 0 art_node 16 128 0 46 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 9 1 0 1 1 0 8 0 semapl 112 38 0 28 1 0 1 1 0 8 0 shmpl 112 15 0 0 1 0 1 1 0 8 0 dirhash 1024 31 0 14 3 0 3 3 0 8 0 dino2pl 256 2292 0 751 97 0 97 97 0 8 0 ffsino 288 2292 0 751 111 0 111 111 0 8 0 nchpl 144 3082 0 1379 64 0 64 64 0 8 0 uvmvnodes 80 2616 0 0 54 0 54 54 0 8 0 vnodes 216 2616 0 0 146 0 146 146 0 8 0 namei 1024 10345 0 10343 1 0 1 1 0 8 0 percpumem 16 50 0 3 1 0 1 1 0 8 0 kstatmem 264 26 0 6 2 0 2 2 0 8 0 scxspl 216 10454 0 10451 10 8 2 8 1 8 1 plimitpl 152 196 0 176 2 0 2 2 0 8 1 sigapl 424 897 0 848 7 0 7 7 0 8 0 knotepl 120 388 0 0 12 0 12 12 0 8 0 kqueuepl 224 169 0 160 2 1 1 2 0 8 0 pipepl 336 254 0 227 6 3 3 6 0 8 0 fdescpl 520 878 0 848 3 0 3 3 0 8 0 filepl 160 5283 0 5097 17 1 16 17 0 8 6 lockfpl 104 100 0 98 1 0 1 1 0 8 0 lockfspl 48 46 0 44 1 0 1 1 0 8 0 sessionpl 144 61 0 46 1 0 1 1 0 8 0 pgrppl 48 103 0 81 1 0 1 1 0 8 0 ucredpl 104 852 0 835 1 0 1 1 0 8 0 zombiepl 144 848 0 848 1 0 1 1 0 8 1 processpl 1240 897 0 848 5 0 5 5 0 8 0 procpl 656 1639 0 1588 7 0 7 7 0 8 1 sosppl 168 4 0 4 1 0 1 1 0 8 1 sockpl 728 1448 0 1403 20 8 12 20 0 8 7 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 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 128 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 337 0 0 22 0 22 22 0 8 0 bufpl 280 3121 0 113 215 0 215 215 0 8 0 anonpl 32 5815 0 0 47 0 47 47 0 246 0 amapchunkpl 152 23827 0 23463 45 2 43 45 0 158 22 amappl16 200 2519 0 2501 7 2 5 5 0 8 3 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 168 0 157 1 0 1 1 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 1507 0 1478 2 0 2 2 0 8 0 amappl11 160 43 0 33 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 267 0 267 1 1 0 1 0 8 0 amappl8 136 31 0 29 1 0 1 1 0 8 0 amappl7 128 109 0 98 1 0 1 1 0 8 0 amappl6 120 197 0 192 1 0 1 1 0 8 0 amappl5 112 114 0 108 1 0 1 1 0 8 0 amappl4 104 332 0 316 1 0 1 1 0 8 0 amappl3 96 4184 0 4099 4 0 4 4 0 8 0 amappl2 88 734 0 673 2 0 2 2 0 8 0 amappl1 80 12899 0 12268 17 0 17 17 0 8 0 amappl 88 6375 0 6249 5 0 5 5 0 92 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 128 253 0 253 1 1 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 0 1 0 1 1 0 8 0 uaddrrnd 24 878 0 848 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 878 0 848 1 0 1 1 0 8 0 vmmpekpl 168 10378 0 10331 3 0 3 3 0 8 0 vmmpepl 168 64884 0 63041 112 2 110 112 0 357 9 vmsppl 480 877 0 848 7 1 6 6 0 8 0 rwobjpl 72 22854 0 19361 67 0 67 67 0 8 2 pdppl 4096 1764 0 1696 118 40 78 96 0 8 10 pvpl 32 15031 0 0 122 0 122 122 0 265 0 pmappl 256 877 0 848 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 427 0 53 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837f0ff0) 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(ffffffff839626a0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:129 [inline] __mp_lock(ffffffff839626a0) at __mp_lock+0x199 sys/kern/kern_lock.c:160 intr_handler(ffff80002a1f89b0,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __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(ffffffff839626a0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:129 [inline] __mp_lock(ffffffff839626a0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:160 __mp_acquire_count(ffffffff839626a0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2da sys/kern/kern_synch.c:366 softclock_thread_run(ffffffff83864478) at softclock_thread_run+0x79 sys/kern/kern_timeout.c:845 softclock_thread(ffff8000fffff480) at softclock_thread+0x10a sys/kern/kern_timeout.c:867 end trace frame: 0x0, count: 3 ddb{0}> trace x86_ipi_db(ffffffff837f0ff0) 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(ffffffff839626a0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:129 [inline] __mp_lock(ffffffff839626a0) at __mp_lock+0x199 sys/kern/kern_lock.c:160 intr_handler(ffff80002a1f89b0,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __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(ffffffff839626a0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:129 [inline] __mp_lock(ffffffff839626a0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:160 __mp_acquire_count(ffffffff839626a0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2da sys/kern/kern_synch.c:366 softclock_thread_run(ffffffff83864478) at softclock_thread_run+0x79 sys/kern/kern_timeout.c:845 softclock_thread(ffff8000fffff480) at softclock_thread+0x10a sys/kern/kern_timeout.c:867 end trace frame: 0x0, count: -12 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344bdd9) at panic+0x1e5 sys/kern/subr_prf.c:198 vrele(fffffd806d4f62b8) at vrele+0x274 sys/kern/vfs_subr.c:831 uvn_detach(fffffd806d479980) at uvn_detach+0x1b7 sys/uvm/uvm_vnode.c:391 uvm_unmap_detach(ffff80002a329c98,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvmspace_exec(ffff80002a2aaf78,1000,7f7fffffc000) at uvmspace_exec+0x3b7 sys/uvm/uvm_map.c:3393 sys_execve(ffff80002a2aaf78,ffff80002a32a330,ffff80002a32a280) at sys_execve+0xae0 sys/kern/kern_exec.c:453 syscall(ffff80002a32a330) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a32a330) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70b67a34c350, count: 6 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344bdd9) at panic+0x1e5 sys/kern/subr_prf.c:198 vrele(fffffd806d4f62b8) at vrele+0x274 sys/kern/vfs_subr.c:831 uvn_detach(fffffd806d479980) at uvn_detach+0x1b7 sys/uvm/uvm_vnode.c:391 uvm_unmap_detach(ffff80002a329c98,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvmspace_exec(ffff80002a2aaf78,1000,7f7fffffc000) at uvmspace_exec+0x3b7 sys/uvm/uvm_map.c:3393 sys_execve(ffff80002a2aaf78,ffff80002a32a330,ffff80002a32a280) at sys_execve+0xae0 sys/kern/kern_exec.c:453 syscall(ffff80002a32a330) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a32a330) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70b67a34c350, count: -9