panic: pr_find_pagehead: mbufpl: incorrect page 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(ffffffff821d38e6) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_put(ffffffff825b28a0,fffffd80654b0000) at pool_do_put+0x36a pool_put(ffffffff825b28a0,fffffd80654b0000) at pool_put+0x4b sys/kern/subr_pool.c:794 m_free(fffffd80654b0000) at m_free+0x119 sys/kern/uipc_mbuf.c:459 ml_purge(ffff80001e439dc8) at ml_purge+0x50 m_freem sys/kern/uipc_mbuf.c:538 [inline] ml_purge(ffff80001e439dc8) at ml_purge+0x50 sys/kern/uipc_mbuf.c:1628 ifq_purge(ffff8000009fba78) at ifq_purge+0x97 sys/net/ifq.c:462 tun_dev_close(5d00,7) at tun_dev_close+0xc8 sys/net/if_tun.c:460 spec_close(ffff80001e439ef0) at spec_close+0x311 sys/kern/spec_vnops.c:555 VOP_CLOSE(fffffd805dc6b9c0,7,fffffd806c3bf9c0,ffff80001d339758) at VOP_CLOSE+0xc0 sys/kern/vfs_vops.c:174 vn_closefile(fffffd80566a2e20,ffff80001d339758) at vn_closefile+0xd2 vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffd80566a2e20,ffff80001d339758) at vn_closefile+0xd2 sys/kern/vfs_vnops.c:614 fdrop(fffffd80566a2e20,ffff80001d339758) at fdrop+0xc2 sys/kern/kern_descrip.c:1276 closef(fffffd80566a2e20,ffff80001d339758) at closef+0x117 sys/kern/kern_descrip.c:1260 fdfree(ffff80001d339758) at fdfree+0x100 sys/kern/kern_descrip.c:1192 end trace frame: 0xffff80001e43a140, count: 0 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs.