Public bug reported: Hi,
my setup is like this: 4 SATA disks are configured as a software RAID5, the complete RAID is encrypted using LUKS and inside this LUKS containers is one volume group with several LVs. There's also one eSATA disk using LUKS but no RAID or LVM. When writing to the eSATA disk everything works smoothly. When reading from the RAID everything works smoothly. But when writing larger amounts of data (e.g. an rsync running over a 100 MBit/s network link) to the RAID I see kcryptd going into uninterruptible sleep (D) state and consuming 100% CPU load (IO wait). If I don't stop the data the system crashes soon after, last overall system load displayed is about 8 (normal idle load is 0.2 on this system). When I'm using GRML 2009.10 in the same system I can write with full speed to the RAID, tested from the eSATA disk. I've tried renicing kblockd and kcryptd to 15 according to https://lists .linux-foundation.org/pipermail/bugme-new/2007-June/016431.html which somewhat seems to lessen the impact, at least I have the chance to stop the data coming in before the system crashes this way. There's nothing in dmesg whatsoever. $ uname -a Linux sakura 2.6.31-19-generic #56-Ubuntu SMP Thu Jan 28 02:39:34 UTC 2010 x86_64 GNU/Linux $ cat /proc/version_signature Ubuntu 2.6.31-19.56-generic $ apt-cache policy linux linux: Installed: (none) Candidate: 2.6.31.19.32 Version table: 2.6.31.19.32 0 500 http://de.archive.ubuntu.com karmic-updates/main Packages 500 http://security.ubuntu.com karmic-security/main Packages 2.6.31.14.27 0 500 http://de.archive.ubuntu.com karmic/main Packages $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 9.10 Release: 9.10 Codename: karmic regards, Bodo ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- kcryptd using 100% IO load https://bugs.launchpad.net/bugs/529510 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
