panic: vrele: v_writecount != 0 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *398388 34674 0 0x1004 0 0K syz-executor 473061 92638 73 0x1100010 0x1 1 syslogd db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8331ff57) at panic+0x1e5 sys/kern/subr_prf.c:198 vrele(fffffd806d0943a0) at vrele+0x274 uvn_detach(fffffd806e3e0e68) at uvn_detach+0x1b7 sys/uvm/uvm_vnode.c:375 uvm_unmap_detach(ffff80003c4379d8,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvmspace_exec(ffff800035fe6fb0,1000,7f7fffffc000) at uvmspace_exec+0x3b7 sys/uvm/uvm_map.c:3393 sys_execve(ffff800035fe6fb0,ffff80003c438070,ffff80003c437fc0) at sys_execve+0xc31 sys/kern/kern_exec.c:453 syscall(ffff80003c438070) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c438070) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7255a3cbf710, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: vrele: v_writecount != 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8331ff57) at panic+0x1e5 sys/kern/subr_prf.c:198 vrele(fffffd806d0943a0) at vrele+0x274 uvn_detach(fffffd806e3e0e68) at uvn_detach+0x1b7 sys/uvm/uvm_vnode.c:375 uvm_unmap_detach(ffff80003c4379d8,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvmspace_exec(ffff800035fe6fb0,1000,7f7fffffc000) at uvmspace_exec+0x3b7 sys/uvm/uvm_map.c:3393 sys_execve(ffff800035fe6fb0,ffff80003c438070,ffff80003c437fc0) at sys_execve+0xc31 sys/kern/kern_exec.c:453 syscall(ffff80003c438070) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c438070) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7255a3cbf710, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c437820 rbx 0xffffffff8384ce07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff800035fe6fb0 rax 0xffffffff8384bff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x8549635570749ef3 r11 0xd878fc471b2ef65f r12 0xffffffff8384cc08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff82d87095 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c437810 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=398388 pid=34674 tcnt=1 stat=onproc flags process=1004 proc=0 runpri=50, usrpri=86, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0xffff800035fe6fb0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800035fe67e8,0xffff800035fe7cb8 process=0xffff8000fffeb508 user=0xffff80003c433000, vmspace=0xfffffd806c200018 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 68316 227081 7516 0 2 0 syz-executor 68316 341177 7516 0 2 0x4000000 syz-executor *34674 398388 7748 0 7 0x1004 syz-executor 57186 521897 47491 0 2 0 syz-executor 57186 13893 47491 0 3 0x4000080 fsleep syz-executor 88827 450591 5036 0 2 0 syz-executor 88827 483865 5036 0 3 0x4000080 fsleep syz-executor 88827 297061 5036 0 2 0x4000000 syz-executor 66706 445674 90018 0 2 0 syz-executor 66706 43206 90018 0 3 0x4000080 fsleep syz-executor 62097 150135 21831 0 2 0xc80 syz-executor 62097 231883 21831 0 3 0x4000080 pipewr syz-executor 62097 475693 21831 0 3 0x4000080 fsleep syz-executor 67167 316585 0 0 3 0x14280 nfsidl nfsio 58731 493640 0 0 3 0x14280 nfsidl nfsio 51094 379829 0 0 3 0x14280 nfsidl nfsio 23449 237337 0 0 3 0x14280 nfsidl nfsio 74713 456944 0 0 3 0x14280 nfsidl nfsio 41294 233337 0 0 3 0x14280 nfsidl nfsio 4860 314767 1 0 3 0x100083 ttyin getty 7516 90765 7748 0 2 0xc82 syz-executor 5036 520686 7748 0 2 0x2 syz-executor 94833 88256 7748 0 3 0x82 wait syz-executor 47491 19709 7748 0 2 0xc82 syz-executor 21831 40200 7748 0 2 0x2 syz-executor 90018 192004 7748 0 2 0xc82 syz-executor 86204 266808 7748 0 2 0x2 syz-executor 7748 505919 65983 0 3 0x82 kqread syz-executor 65983 145946 94612 0 3 0x10008a sigsusp ksh 94612 362241 52825 0 3 0x98 kqread sshd-session 52825 51210 73823 0 3 0x92 kqread sshd-session 73823 285255 1 0 3 0x88 kqread sshd 55186 242579 77357 74 3 0x1100092 bpf pflogd 77357 363888 1 0 3 0x80 sbwait pflogd 92638 473061 23836 73 7 0x1100011 syslogd 23836 200025 1 0 3 0x100082 sbwait syslogd 90167 271827 1 0 3 0x100080 kqread resolvd 84374 210035 97240 77 3 0x100092 kqread dhcpleased 34032 63258 97240 77 3 0x100092 kqread dhcpleased 97240 388555 1 0 3 0x80 kqread dhcpleased 17651 301473 0 0 3 0x14200 bored smr 27347 164189 0 0 2 0x14200 zerothread 35374 479520 0 0 3 0x14200 aiodoned aiodoned 493 83198 0 0 3 0x14200 syncer update 3348 166478 0 0 3 0x14200 cleaner cleaner 18149 318700 0 0 3 0x14200 reaper reaper 99217 48320 0 0 3 0x14200 pgdaemon pagedaemon 45349 520776 0 0 3 0x14200 bored viomb 51021 303847 0 0 3 0x40014200 acpi0 acpi0 22070 497180 0 0 3 0x40014200 idle1 26506 442904 0 0 3 0x14200 bored softnet1 22964 293027 0 0 3 0x14200 bored softnet0 92467 426937 0 0 3 0x14200 bored systqmp 80729 148956 0 0 3 0x14200 bored systq 59181 51100 0 0 3 0x14200 tmoslp softclockmp 95447 52160 0 0 3 0x40014200 tmoslp softclock 97784 445132 0 0 3 0x40014200 idle0 1 414004 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 34674 (syz-executor) thread 0xffff800035fe6fb0 (398388) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff83901248) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:765 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10223 11031K 11424K 166960K 12374 0 pcb 17 13K 14K 166960K 178 0 rtable 212 10K 10K 166960K 447 0 pf 34 17K 67486K 166960K 141 0 ifaddr 39 7K 8K 166960K 87 0 ifgroup 51 2K 2K 166960K 135 0 sysctl 4 1K 9K 166960K 12 0 counters 66 36K 37K 166960K 166 0 ioctlops 0 0K 8K 166960K 1683 0 iov 0 0K 16K 166960K 42 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1412 89K 89K 166960K 2190 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 15 0 VM map 2 1K 1K 166960K 2 0 sem 16 3K 3K 166960K 65 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 54K 240K 166960K 896 0 sigio 0 0K 0K 166960K 11 0 proc 72 115K 180K 166960K 655 0 subproc 63 3K 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 100 0 in_multi 90 6K 7K 166960K 146 0 ether_multi 1 0K 0K 166960K 12 0 mrt 2 0K 0K 166960K 12 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 1 0K 1K 166960K 529 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 223 150K 177K 166960K 9462 0 UVM aobj 53 6K 6K 166960K 58 0 pinsyscall 42 84K 104K 166960K 2033 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 0K 166960K 57 0 NDP 11 0K 1K 166960K 60 0 temp 53 8658K 8752K 166960K 30862 0 kqueue 13 20K 29K 166960K 147 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 78 0 75 1 0 1 1 0 8 0 rtentry 176 133 0 47 6 0 6 6 0 8 0 unpcb 144 579 0 560 8 4 4 6 0 8 3 syncache 336 5 0 5 2 2 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 254 0 246 7 6 1 4 0 8 0 arp 136 21 0 7 1 0 1 1 0 8 0 inpcb 328 911 0 899 13 10 3 7 0 8 1 nd6 152 29 0 6 1 0 1 1 0 8 0 pkpcb 40 2 0 2 2 2 0 1 0 8 0 kcovpl 48 9 0 2 1 0 1 1 0 8 0 ppxss 1192 42 0 42 3 2 1 1 0 8 1 pppxif 1504 1 0 1 1 1 0 1 0 8 0 pfstscr 40 6 0 6 1 1 0 1 0 8 0 pffrag 232 75 0 66 1 0 1 1 0 482 0 pffrnode 88 9 0 1 1 0 1 1 0 8 0 pffrent 40 143 0 134 1 0 1 1 0 8 0 pfosfp 40 1429 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1429 0 714 21 0 21 21 0 8 0 pfstitem 24 70 0 19 1 0 1 1 0 8 0 pfstkey 128 76 0 25 2 0 2 2 0 8 0 pfstate 384 72 0 22 6 0 6 6 0 8 0 pfrule 1344 29 0 22 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 593 0 219 33 8 25 31 0 8 0 art_table 40 594 0 219 5 0 5 5 0 8 0 art_node 32 132 0 55 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 2 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 59 0 45 1 0 1 1 0 8 0 shmpl 112 53 0 5 2 0 2 2 0 8 0 dirhash 1024 26 0 9 3 0 3 3 0 8 0 dino2pl 256 3067 0 1554 96 0 96 96 0 8 0 ffsino 296 3067 0 1554 118 0 118 118 0 8 0 nchpl 144 4277 0 2574 64 0 64 64 0 8 0 rtmask 32 8 0 8 2 2 0 1 0 8 0 vnodes 216 3592 0 0 200 0 200 200 0 8 0 namei 1024 15291 0 15290 2 1 1 1 0 8 0 percpumem 16 98 0 50 1 0 1 1 0 8 0 vcpupl 3968 2 0 0 1 0 1 1 0 8 0 vmpool 840 2 0 0 1 0 1 1 0 8 0 kstatmem 264 86 0 62 4 2 2 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 8 0 8 3 2 1 1 0 8 1 scxspl 216 21972 0 21972 11 9 2 8 1 8 2 plimitpl 152 538 0 522 1 0 1 1 0 8 0 sigapl 424 1197 0 1145 9 1 8 8 0 8 0 knotepl 120 568 0 0 17 0 17 17 0 8 0 kqueuepl 224 352 0 343 6 4 2 5 0 8 1 pipepl 344 232 0 204 9 6 3 9 0 8 0 fdescpl 528 1157 0 1127 3 0 3 3 0 8 0 filepl 160 7818 0 7607 19 6 13 16 0 8 0 lockfpl 104 535 0 533 2 1 1 2 0 8 0 lockfspl 48 211 0 209 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 143 0 126 1 0 1 1 0 8 0 ucredpl 104 1883 0 1870 1 0 1 1 0 8 0 zombiepl 144 1146 0 1145 1 0 1 1 0 8 0 processpl 1232 1197 0 1145 7 2 5 6 0 8 0 procpl 664 2444 0 2385 7 0 7 7 0 8 0 sosppl 176 6 0 6 2 1 1 1 0 8 1 sockpl 752 1598 0 1564 25 14 11 17 0 8 7 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 131 0 0 17 0 17 17 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 36 0 0 5 0 5 5 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 205 0 0 13 0 13 13 0 8 0 bufpl 280 8087 0 1950 439 0 439 439 0 8 0 anonpl 32 11360 0 0 92 0 92 92 0 246 0 amapchunkpl 152 31476 0 31039 43 8 35 35 0 158 15 amappl16 200 3792 0 3760 36 21 15 27 0 8 6 amappl15 192 24 0 24 1 1 0 1 0 8 0 amappl14 184 6 0 6 1 1 0 1 0 8 0 amappl13 176 440 0 439 1 0 1 1 0 8 0 amappl12 168 1539 0 1499 3 0 3 3 0 8 0 amappl11 160 8 0 8 1 1 0 1 0 8 0 amappl10 152 125 0 109 1 0 1 1 0 8 0 amappl9 144 276 0 276 2 2 0 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 85 0 84 1 0 1 1 0 8 0 amappl6 120 292 0 279 1 0 1 1 0 8 0 amappl5 112 90 0 79 1 0 1 1 0 8 0 amappl4 104 431 0 399 1 0 1 1 0 8 0 amappl3 96 5447 0 5363 4 1 3 3 0 8 0 amappl2 88 1299 0 1222 2 0 2 2 0 8 0 amappl1 80 12728 0 12155 14 0 14 14 0 8 0 amappl 88 8573 0 8426 5 0 5 5 0 92 0 uvmvnodes 80 130 0 0 3 0 3 3 0 8 0 dma65536 65536 2 0 2 1 1 0 1 0 8 0 dma16384 16384 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 128 254 0 254 2 2 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 57 0 5 1 0 1 1 0 8 0 uaddrrnd 24 1158 0 1128 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1158 0 1128 1 0 1 1 0 8 0 vmmpekpl 168 11315 0 11259 3 0 3 3 0 8 0 vmmpepl 168 79874 0 78031 107 9 98 107 0 357 2 vmsppl 488 1157 0 1128 5 0 5 5 0 8 0 rwobjpl 80 23395 0 22321 34 5 29 32 0 8 0 pdppl 4096 2327 0 2258 107 34 73 85 0 8 4 pvpl 32 17572 0 0 143 1 142 143 0 265 0 pmappl 256 1159 0 1128 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 297 0 54 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 panic(ffffffff8331ff57) at panic+0x1e5 sys/kern/subr_prf.c:198 vrele(fffffd806d0943a0) at vrele+0x274 uvn_detach(fffffd806e3e0e68) at uvn_detach+0x1b7 sys/uvm/uvm_vnode.c:375 uvm_unmap_detach(ffff80003c4379d8,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvmspace_exec(ffff800035fe6fb0,1000,7f7fffffc000) at uvmspace_exec+0x3b7 sys/uvm/uvm_map.c:3393 sys_execve(ffff800035fe6fb0,ffff80003c438070,ffff80003c437fc0) at sys_execve+0xc31 sys/kern/kern_exec.c:453 syscall(ffff80003c438070) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c438070) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7255a3cbf710, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp 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 __mp_lock(ffffffff83901040) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83901040) at __mp_lock+0x192 sys/kern/kern_lock.c:173 ktrstruct(ffff80002a273c98,ffffffff833beafa,ffff80002a2ce150,20) at ktrstruct+0xdf sys/kern/kern_ktrace.c:313 sys_kevent(ffff80002a273c98,ffff80002a2ce4d0,ffff80002a2ce420) at sys_kevent+0x7bf sys/kern/kern_event.c:1327 syscall(ffff80002a2ce4d0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2ce4d0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79263f4839d0, count: 7 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 __mp_lock(ffffffff83901040) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83901040) at __mp_lock+0x192 sys/kern/kern_lock.c:173 ktrstruct(ffff80002a273c98,ffffffff833beafa,ffff80002a2ce150,20) at ktrstruct+0xdf sys/kern/kern_ktrace.c:313 sys_kevent(ffff80002a273c98,ffff80002a2ce4d0,ffff80002a2ce420) at sys_kevent+0x7bf sys/kern/kern_event.c:1327 syscall(ffff80002a2ce4d0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2ce4d0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79263f4839d0, count: -8