linux-ext4 - [Bug 22302] 2.6.36 BUG: scheduling while atomic: rc.sysinit/1376/0x00000002

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Message-Id: <201011072225.oA7MP38n001526@demeter1.kernel.org>
Date:	Sun, 7 Nov 2010 22:25:03 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 22302] 2.6.36 BUG: scheduling while atomic:
 rc.sysinit/1376/0x00000002

https://bugzilla.kernel.org/show_bug.cgi?id=22302

Theodore Tso <tytso@....edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tytso@....edu

--- Comment #1 from Theodore Tso <tytso@....edu>  2010-11-07 22:25:01 ---
This is caused by an interaction in two changes that happened in parallel in
2.6.36: commit id's dd3932eddf4 (block: remove BLKDEV_IFL_WAIT) and 
commit 5c521830cf3 (ext4: Support discard requests when running in no-journal
mode).

The problem is that ext4_free_blocks() can be called by functions which are
holding spinlocks, so it can't sleep --- and sb_issue_discard() now always
waits for the discard to be completed.  It doesn't support an asynchronous mode
at all.

The fix for the short-term is to remove the call to ext4_issue_discard() in
ext4_free_blocks().  This effectively removes the functionality of commit 
5c521830cf3.  The long-term fix would be to implement a version of
sb_issue_discard() which supports asynchronous mode, with an optional callback.

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