linux-ext4 - [Bug 15025] Oops in ext4 driver

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Date:	Wed, 17 Feb 2010 13:48:11 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15025] Oops in ext4 driver

http://bugzilla.kernel.org/show_bug.cgi?id=15025





--- Comment #11 from Dmitry Monakhov <dmonakhov@...nvz.org>  2010-02-17 13:47:27 ---
After the patch i can not trigger the bug (In reply to comment #10)
> On Tue, Feb 16, 2010 at 02:08:33PM +0000, bugzilla-daemon@...zilla.kernel.org
> wrote:
> > The issue was fixed by following commit
> > http://git.kernel.org/?p=linux/kernel/git/tytso/ext4.git;a=commit;h=1db913823c0f8360fccbd24ca67eb073966a5ffd
> 
> This cannot be, as I don't use quota.
It i is posible to triger the bug without quota.
Untill the patch it we have following code
fs/ext4/inode.c:
1850         if (ext4_claim_free_blocks(sbi, md_needed + 1)) {
1851                 vfs_dq_release_reservation_block(inode, md_needed + 1);
1852                 if (ext4_should_retry_alloc(inode->i_sb, &retries)) {
1853                 retry:
1854                         if (md_reserved)
1855                                 write_inode_now(inode, (retries == 3));
^^^^^^^^^^ Here we goes in to lack of journal credits. ^^^^^^^^^^^^^^^^^^^^^^
1856                         yield();
1857                         goto repeat;
1858                 }
1859                 return -ENOSPC;
1860         }
You have failed exactly here.
So the bug happens even in case of ENOSPC (try following testase):
dd if=/dev/zero /mnt/BIG_FILE bs=1M 
But it takes longer if partition is really huge.

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