panic: vput: v_writecount != 0 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 vput(fffffd80365ad580) at vput+0x187 sys/kern/vfs_subr.c:759 vn_closefile(fffffd80361625a8,ffff8000ffff5b38) at vn_closefile+0x15b sys/kern/vfs_vnops.c:584 fdrop(fffffd80361625a8,ffff8000ffff5b38) at fdrop+0xc9 sys/kern/kern_descrip.c:1269 closef(fffffd80361625a8,ffff8000ffff5b38) at closef+0x118 sys/kern/kern_descrip.c:1253 fdfree(ffff8000ffff5b38) at fdfree+0xf7 sys/kern/kern_descrip.c:1185 exit1(ffff8000ffff5b38,0,1) at exit1+0x32f sys/kern/kern_exit.c:196 sys_exit(ffff8000ffff5b38,ffff8000149781d0,ffff800014978240) at sys_exit+0x17 sys/kern/kern_exit.c:94 syscall(ffff8000149782a0) at syscall+0x508 Xsyscall(6,1,7b9aab57000,1,7f7ffffe32f8,0) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe3270, count: 4 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic vput: v_writecount != 0 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 vput(fffffd80365ad580) at vput+0x187 sys/kern/vfs_subr.c:759 vn_closefile(fffffd80361625a8,ffff8000ffff5b38) at vn_closefile+0x15b sys/kern/vfs_vnops.c:584 fdrop(fffffd80361625a8,ffff8000ffff5b38) at fdrop+0xc9 sys/kern/kern_descrip.c:1269 closef(fffffd80361625a8,ffff8000ffff5b38) at closef+0x118 sys/kern/kern_descrip.c:1253 fdfree(ffff8000ffff5b38) at fdfree+0xf7 sys/kern/kern_descrip.c:1185 exit1(ffff8000ffff5b38,0,1) at exit1+0x32f sys/kern/kern_exit.c:196 sys_exit(ffff8000ffff5b38,ffff8000149781d0,ffff800014978240) at sys_exit+0x17 sys/kern/kern_exit.c:94 syscall(ffff8000149782a0) at syscall+0x508 Xsyscall(6,1,7b9aab57000,1,7f7ffffe32f8,0) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe3270, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800014977ec0 rbx 0xffff800014977f70 rdx 0x2 rcx 0x1 rax 0x1 r8 0xffff800014977e80 r9 0x1 r10 0x3e1714cd3c855e2d r11 0x3adfe135cfb3c66a r12 0x3000000008 r13 0xffff800014977ed0 r14 0x100 r15 0x1 rip 0xffffffff8141a408 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800014977eb0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor5323) pid=465591 stat=onproc flags process=100a proc=2000 pri=32, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff4778,0xffffffff82298c18 process=0xffff800014942018 user=0xffff800014973000, vmspace=0xfffffd803f00c880 estcpu=1, cpticks=2, pctcpu=0.26 user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 29991 402795 15670 0 3 0x10008a pause ksh 15670 94556 51809 0 3 0x92 select sshd 18731 469241 1 0 3 0x100083 ttyin getty 51809 457842 1 0 3 0x80 select sshd 38197 270356 58469 73 2 0x100090 syslogd 58469 370880 1 0 3 0x100082 netio syslogd 60303 240953 1 77 3 0x100090 poll dhclient 78467 178114 1 0 3 0x80 poll dhclient 18027 195233 0 0 3 0x14200 pgzero zerothread 1463 405450 0 0 3 0x14200 aiodoned aiodoned 57967 304960 0 0 3 0x14200 syncer update 16995 166438 0 0 3 0x14200 cleaner cleaner 23718 414175 0 0 3 0x14200 reaper reaper 58189 87268 0 0 3 0x14200 pgdaemon pagedaemon 1989 289181 0 0 3 0x14200 bored crynlk 59943 10757 0 0 3 0x14200 bored crypto 86292 295651 0 0 3 0x40014200 acpi0 acpi0 34753 382454 0 0 3 0x14200 bored softnet 25479 258957 0 0 3 0x14200 bored systqmp 17978 239700 0 0 3 0x14200 bored systq 69271 415696 0 0 3 0x40014200 bored softclock 25946 210983 0 0 3 0x40014200 idle0 48739 506358 0 0 3 0x14200 bored smr 1 117423 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9428 6307K 6310K 78643K 10526 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 61 1K 2K 78643K 116 0 0 ifaddr 21 7K 7K 78643K 21 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 13 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1181 74K 74K 78643K 1187 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 0K 0K 78643K 2 0 0 sem 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1793 195K 288K 78643K 12645 0 0 file desc 1 0K 0K 78643K 1 0 0 proc 40 30K 38K 78643K 257 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 11 0K 0K 78643K 11 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 18 79K 79K 78643K 18 0 0 exec 0 0K 1K 78643K 154 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 58 3K 3K 78643K 731 0 0 UVM aobj 2 2K 2K 78643K 2 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 3 0K 0K 78643K 3 0 0 temp 30 2707K 2771K 78643K 1716 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 2 0 0 1 0 1 1 0 8 0 rtpcb 80 15 0 13 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 120 31 0 21 1 0 1 1 0 8 0 syncache 264 5 0 5 1 0 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 22 0 16 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 97 0 0 7 0 7 7 0 8 0 art_table 32 98 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1393 0 17 45 0 45 45 0 8 0 ffsino 240 1393 0 17 81 0 81 81 0 8 0 nchpl 144 1578 0 43 57 0 57 57 0 8 0 uvmvnodes 72 1402 0 0 26 0 26 26 0 8 0 vnodes 200 1402 0 0 74 0 74 74 0 8 0 namei 1024 3376 0 3376 1 0 1 1 0 8 1 scxspl 192 2266 0 2266 4 3 1 4 0 8 1 plimitpl 152 13 0 8 1 0 1 1 0 8 0 sigapl 432 176 0 166 2 0 2 2 0 8 0 futexpl 56 17 0 17 1 0 1 1 0 8 1 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 104 1 0 0 1 0 1 1 0 8 0 pipepl 112 118 0 111 1 0 1 1 0 8 0 fdescpl 424 177 0 166 2 0 2 2 0 8 0 filepl 120 843 0 799 2 0 2 2 0 8 0 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 48 3 0 3 1 1 0 1 0 8 0 sessionpl 112 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 47 0 40 1 0 1 1 0 8 0 zombiepl 144 167 0 166 1 0 1 1 0 8 0 processpl 864 191 0 166 4 0 4 4 0 8 0 procpl 632 194 0 169 3 0 3 3 0 8 0 sockpl 384 68 0 50 2 0 2 2 0 8 0 mcl4k 4096 10 0 10 1 0 1 1 0 8 1 mcl2k 2048 6083 0 6048 8 2 6 8 0 8 0 mtagpl 80 2 0 2 1 1 0 1 0 8 0 mbufpl 256 10347 0 10304 7 3 4 5 0 8 1 bufpl 256 2078 0 262 114 0 114 114 0 8 0 anonpl 16 19170 0 17985 6 1 5 6 0 62 0 amapchunkpl 152 564 0 523 2 0 2 2 0 158 0 amappl16 192 93 0 86 1 0 1 1 0 8 0 amappl14 176 36 0 32 1 0 1 1 0 8 0 amappl13 168 1 0 1 1 1 0 1 0 8 0 amappl12 160 4 0 4 1 1 0 1 0 8 0 amappl11 152 41 0 30 1 0 1 1 0 8 0 amappl10 144 46 0 46 1 0 1 1 0 8 1 amappl9 136 385 0 384 1 0 1 1 0 8 0 amappl8 128 84 0 79 1 0 1 1 0 8 0 amappl7 120 16 0 15 1 0 1 1 0 8 0 amappl6 112 42 0 38 1 0 1 1 0 8 0 amappl5 104 144 0 134 1 0 1 1 0 8 0 amappl4 96 399 0 375 1 0 1 1 0 8 0 amappl3 88 147 0 135 1 0 1 1 0 8 0 amappl2 80 720 0 665 2 0 2 2 0 8 0 amappl1 72 12131 0 11731 14 5 9 14 0 8 0 amappl 80 392 0 370 1 0 1 1 0 84 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 177 0 166 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 177 0 166 1 0 1 1 0 8 0 vmmpekpl 168 5326 0 5312 1 0 1 1 0 8 0 vmmpepl 168 25873 0 25069 44 8 36 44 0 357 1 vmsppl 272 176 0 166 1 0 1 1 0 8 0 pdppl 4096 361 0 332 5 0 5 5 0 8 0 pvpl 32 72506 0 69721 26 0 26 26 0 265 3 pmappl 200 176 0 166 1 0 1 1 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 232 0 7 7 0 7 7 0 8 0 ddb>