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I retried booting 3.6.7-5 after fiddling with the
grub menu. So, I can report now that 3.6.7 still does not 1. awaken sleeping drives with a hard reset 2. wait for their full awakening, 3. before committing io to them, and thus io fails, FS gets corrupted, and data gets lost. On 11/28/2012 11:01 AM, Klaus Knopper
wrote:
Hello again, As a followup to the kernel 3.6.x question of JD, I have to report that zram has a dangerous defect, probably starting around kernel 3.6.5. As soon as data gets swapped out to the zram device, the system will freeze because of memory corruption. See http://code.google.com/p/compcache/issues/detail?id=102 . There is a solution/patch to this problem, but it's still not implemented in kernel 3.6.8. I'm currently building a patched kernel package, since compressed swap in RAM is a quite useful feature in Knoppix. You will find the source at http://debian-knoppix.alioth.debian.org (probably a 3.6.8 kernel), once it's ready. Knoppix 7.0.4 is not affected, and I will make sure to also include the patch in the next release if it's not already in the original kernel by then. Regards -Klaus On Mon, Nov 26, 2012 at 10:56:55AM +0100, Klaus Knopper wrote:Hello JD, On Sun, Nov 25, 2012 at 06:44:30PM -0700, JD wrote:Hi All, When I updated the kernel to 3.6, and kept updating more subversion of the kernel became available, I started experiencing write errors to all hard drives which have ext3 or ext4 filesystems. Most of the failed reads and writes were caused by the fact that the drives were in standby mode, which is something that is very useful for extending the life of the drive, but which the kernel disk drivers in 3.6.X did not take into account, and thus many failed reads and writes. This problem was not there prior to kernel 3.6!!! And indeed I confirmed this by booting into 3.5.X and 3.4.X. I hope this is helpful to people who might otherwise think their drives are bad.This sounds like a serious kernel bug, which I would not expect occurring in the recent "stable" >= 3.6.7 kernels. I just uploaded a kernel package that I would like to include in Knoppix 7.0.5 I had no problems on my testing computers, but maybe you can recheck by installing these packages (and the static kernel part) on your system, and tell if the errors still occur? http://debian-knoppix.alioth.debian.org/packages/linux-source-3.6.7/ This version has aufs and cloop patched in. Regards -Klaus |