On Mon, Jul 07, 2014 at 11:53:10AM -0400, Theodore Ts'o wrote: > An update from today's ext4 concall. Eric Whitney can fairly reliably > reproduce this on his Panda board with 3.15, and definitely not on > 3.14. So at this point there seems to be at least some kind of 3.15 > regression going on here, regardless of whether it's in the eMMC > driver or the ext4 code. (It also means that the bug fix I found is > irrelevant for the purposes of working this issue, since that's a much > harder to hit, and that bug has been around long before 3.14.) > > The problem in terms of narrowing it down any further is that the > Pandaboard is running into RCU bugs which makes it hard to test the > early 3.15-rcX kernels..... In the hopes of making it easy to bisect, I've created a kernel branch which starts with 3.14, and then adds on all of the ext4-related commits since then. You can find it at: git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git test-mb_generate_buddy-failure https://git.kernel.org/cgit/linux/kernel/git/tytso/ext4.git/log/?h=test-mb_generate_buddy-failure Eric, can you see if you can repro the failure on your Panda Board? If you can, try doing a bisection search on these series: git bisect start git bisect good v3.14 git bisect bad test-mb_generate_buddy-failure Hopefully if it is caused by one of the commits in this series, we'll be able to pin point it this way. Thanks!! - Ted -- 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
