tree 39be8d3d708388d52fcae98dd307a60194cc03f8
parent 5946d089379a35dda0e531710b48fca05446a196
author Al Viro <viro@ZenIV.linux.org.uk> 1386553951 -0500
committer Theodore Ts'o <tytso@mit.edu> 1386553951 -0500

ext4: fix del_timer() misuse for ->s_err_report

That thing should be del_timer_sync(); consider what happens
if ext4_put_super() call of del_timer() happens to come just as it's
getting run on another CPU.  Since that timer reschedules itself
to run next day, you are pretty much guaranteed that you'll end up
with kfree'd scheduled timer, with usual fun consequences.  AFAICS,
that's -stable fodder all way back to 2010... [the second del_timer_sync()
is almost certainly not needed, but it doesn't hurt either]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org