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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.

-- 
Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are watching the assignee of the bug.
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html