From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 22302] 2.6.36 BUG: scheduling while atomic:
rc.sysinit/1376/0x00000002
Date: Sun, 7 Nov 2010 22:25:03 GMT
Message-ID: <201011072225.oA7MP38n001526@demeter1.kernel.org>
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Theodore Tso changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tytso@mit.edu
--- Comment #1 from Theodore Tso 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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