Re: kern/56931: Panic in vfs_insmntque(): panic: TAILQ_* forw 0xffffec0928771d00 /usr/src/sys/kern/vfs_mount.c:487

["J. Hannken-Illjes" <hannken%mailbox.org@localhost>]

The following reply was made to PR kern/56931; it has been noted by GNATS.

From: "J. Hannken-Illjes" <hannken%mailbox.org@localhost>
To: NetBSD GNATS <gnats-bugs%netbsd.org@localhost>
Cc: 
Subject: Re: kern/56931: Panic in vfs_insmntque(): panic: TAILQ_* forw
 0xffffec0928771d00 /usr/src/sys/kern/vfs_mount.c:487
Date: Mon, 18 Jul 2022 11:23:00 +0200

 While "gdb" from -current doesn't work "gdb" from 9.2 seems to get the =
 full trace.
 
 (gdb) fr 12
 #12 0xffffffff80eb0a9e in vfs_insmntque (vp=3D0xffff98a871b71d00, =
 mp=3D0xffff98aefa9a4000) at /usr/src/sys/kern/vfs_mount.c:487
 (gdb) print vip->vi_mntvnodes.tqe_next
 $1 =3D (struct vnode_impl *) 0xffff98a871b71a84
 (gdb) print vip->vi_mntvnodes.tqe_next->vi_mntvnodes.tqe_prev
 $2 =3D (struct vnode_impl **) 0xffff98a8
 (gdb) print &vip->vi_mntvnodes.tqe_next
 $3 =3D (struct vnode_impl **) 0xffff98a871b71e58
 
 (gdb) print vip->vi_mntvnodes.tqe_prev
 $4 =3D (struct vnode_impl **) 0xffff98a872901218
 (gdb) print *vip->vi_mntvnodes.tqe_prev
 $5 =3D (struct vnode_impl *) 0xffff98a871b71d00
 
 The first ($1 aka tqe_next) points to garbage, not even 64bit aligned.
 
 --
 J. Hannken-Illjes - hannken%mailbox.org@localhost=