[LU-2370] ldiskfs / ext4 panic with accessing to mb_groups procfs file

Thu, 6 Dec 2012 14:27:47 +0000

fixed in valina kernel as
commit 95599968d19db175829fb580baa6b68939b320fb
Author: Salman Qazi <sqazi@google.com>
Date: Thu May 31 23:52:14 2012 -0400
ext4: remove mb_groups before tearing down the buddy_cache
We can't have references held on pages in the s_buddy_cache while we are
trying to truncate its pages and put the inode. All the pages must be
gone before we reach clear_inode. This can only be gauranteed if we
can prevent new users from grabbing references to s_buddy_cache's pages.
The original bug can be reproduced and the bug fix can be verified by:
while true; do mount -t ext4 /dev/ram0 /export/hda3/ram0; \
umount /export/hda3/ram0; done &
while true; do cat /proc/fs/ext4/ram0/mb_groups; done
Signed-off-by: Salman Qazi <sqazi@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org

Whamcloud Community JIRA

[LU-2370] ldiskfs / ext4 panic with accessing to mb_groups procfs file