[DragonFlyBSD - Bug #2266] panic during shutdown

[Venkatesh Srinivas via Redmine <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>]

Issue #2266 has been updated by Venkatesh Srinivas.


Hi,

It looks like the system accessed the address 0xdeadc122, which is 0xdeadc0de + 0x44; deadcode is filled in to free()d kernel memory.

The particular dereference that generated this invalid address was the extraction of the mountpoint from the vnode structure in vop_write. This means that vop_write was using an already-kfree()d vnode, which is bad news.

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Bug #2266: panic during shutdown
http://bugs.dragonflybsd.org/issues/2266

Author: Ferruccio Zamuner
Status: New
Priority: Normal
Assignee: 
Category: 
Target version: 


it panics during shutdown on vop_write+0x110 at movl 0x44(%edx),edx

http://dl.dropbox.com/u/22827045/IMG_0239.JPG
http://dl.dropbox.com/u/22827045/IMG_0240.JPG
http://dl.dropbox.com/u/22827045/IMG_0242.JPG

> uname -a
DragonFly lap.diff.org 2.13-DEVELOPMENT DragonFly v2.13.0.709.g50e40-DEVELOPMENT #17: Mon Dec 26 23:03:55 CET 2011     fer@lap.diff.org:/usr/obj/mnt2/src/sys/GENERIC  i386




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