** Description changed: + SRU Justification: + + Impact: An upstream change in 2.6.31 tried to simplify the conditions of + having the lazy mmu mode in paravirt disabled. With that in mind several + instances where the lazy mmu mode was disabled explicitly have been + removed. However it was found that from k(un)map_atomic there is a + chance to cause an oops. + + Fix: The following patch has been sent upstream (currently it is only in + the -mm tree and linux-next). It has been tested to fix the problem on + 2.6.38. The specific symptom seen, seems to have come up since 2.6.37, + however the lines of code that are re-introduced have been removed since + 2.6.31. + + Testcase: Trying to do forks under high load should trigger the issue + (at least on 2.6.37+ kernels) + + -- + I'm filing this bug in response to threads at [1] and [2]. From those threads, we see reported that - * the instance becomes unavailable. - * the issue is reported to have to have been seen multiple different instance types - [TYPE: m2.xlarge, m1.large, t1.micro ( all types have hung ) ] - * at [2] there is BUG_ON output pointing at swap, but I would not have expected a user of an m2.xlarge to be using swap, so I personally suspect that that hang is different. - + * the instance becomes unavailable. + * the issue is reported to have to have been seen multiple different instance types + [TYPE: m2.xlarge, m1.large, t1.micro ( all types have hung ) ] + * at [2] there is BUG_ON output pointing at swap, but I would not have expected a user of an m2.xlarge to be using swap, so I personally suspect that that hang is different. [1] http://groups.google.com/group/ec2ubuntu/browse_frm/thread/57ff20c6370f7bb9 [2] https://forums.aws.amazon.com/message.jspa?messageID=262300 ProblemType: Bug DistroRelease: Ubuntu 11.04 Package: linux-image-2.6.38-8-virtual 2.6.38-8.42 ProcVersionSignature: User Name 2.6.38-8.42-virtual 2.6.38.2 Uname: Linux 2.6.38-8-virtual x86_64 AlsaDevices: - total 0 - crw------- 1 root root 116, 1 2011-09-19 17:02 seq - crw------- 1 root root 116, 33 2011-09-19 17:02 timer + total 0 + crw------- 1 root root 116, 1 2011-09-19 17:02 seq + crw------- 1 root root 116, 33 2011-09-19 17:02 timer AplayDevices: Error: [Errno 2] No such file or directory Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory CurrentDmesg: [ 16.930013] eth0: no IPv6 routers present Date: Mon Sep 19 17:23:59 2011 Ec2AMI: ami-1aad5273 Ec2AMIManifest: (unknown) Ec2AvailabilityZone: us-east-1c Ec2InstanceType: t1.micro Ec2Kernel: aki-427d952b Ec2Ramdisk: unavailable Lspci: - + Lsusb: Error: command ['lsusb'] failed with exit code 1: ProcEnviron: - PATH=(custom, user) - LANG=en_US.UTF-8 - SHELL=/bin/bash + PATH=(custom, user) + LANG=en_US.UTF-8 + SHELL=/bin/bash ProcKernelCmdLine: root=LABEL=uec-rootfs ro console=hvc0 ProcModules: acpiphp 24097 0 - Live 0x0000000000000000 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/854050 Title: BUG at /build/buildd/linux-2.6.38/mm/swapfile.c:255 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/854050/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
