On 08/10/2013 09:56 PM, Chris Samuel wrote:
On Sat, 10 Aug 2013 07:07:50 PM Russell Coker wrote:
I can repeatedly get the following SEGV from running "btrfs device stats" on
a device node for an Ext3/4 filesystem. This happens with the version of
the code downloaded from the above GIT repository as well as with an older
version. Obviously the command in question is not going to do anything
useful when run against a non-BTRFS filesystem, but it should do something
other than crash.
The code calls btrfs_read_dev_super() on that filesystem, but it looks like the
checks are failing to detect it as not btrfs. :-(
I can reproduce the crash here too with ext3 and XFS filesystems.
There are quite a number of bug similar to this (that was
reported to the mainling list here, but hard to search now)
which is all triggered by using the backup super block invariably.
v6: access to backup superblock
http://permalink.gmane.org/gmane.comp.file-systems.btrfs/24746
provided fix. But it needs rebase, if you could
goback in git this patch might apply nicely for testing.
Thanks, Anand
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