From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 15025] Oops in ext4 driver
Date: Wed, 17 Feb 2010 13:48:11 GMT
Message-ID: <201002171348.o1HDmBTW031193@demeter.kernel.org>
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--- Comment #11 from Dmitry Monakhov 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@bugzilla.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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