On Monday 16 February 2009 00:42:35 Ralf Hildebrandt wrote: > * Ralf Hildebrandt <Ralf.Hildebrandt@xxxxxxxxxx>: > > > This patch seems good to me. If you would care to add a changelog and > > > Signed-off-by: line, then we could get it merged? > > > > > > I am not too sure about this bug. I have reproduced a strange hang with > > > ext4 (which does include sys_sync and write_cache_pages traces), and > > > also turned up a lockdep report. Also, we haven't seen any reports of > > > this problem on other filesystems. So it could be an ext4 bug. > > > > > > Your traces also have lots of tasks hung waiting for page lock. It is > > > possible that wakeups get lost, which is fixed by this commit in > > > mainline > > > 777c6c5f1f6e757ae49ecca2ed72d6b1f523c007 > > > > > > Which might also be your bug. > > > > > > > > > Any chance you can test this patch (as well as the existing patches > > > you are using to fix write_cache_pages?). > > > > I could test 2.6.28.4 > > Still there in 2.6.28.5 :( I believe it is basically a deadlock in ext4 due to the cyclic writeback change. http://git.kernel.org/?p=linux/kernel/git/tytso/ext4.git;a=commitdiff;h=2acf2c261b823d9d9ed954f348b97620297a36b5 ext4 guys, is this correct? Is there a minimal fix that can be made for .stable kernels? -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
