Description of problem: Since upgrading the kernel to the latest from Rawhide, qemu-kvm suddenly hangs for about a minute when it starts up (before apparently running any part of the guest OS). The easiest way to see this is to run $ libguestfs-test-tool and observe a very long hang after the command line is printed, and before the guest appliance boots (at normal speed). During this time, qemu-kvm consumes 100%, ie. all 4 CPUs. Version-Release number of selected component (if applicable): kernel 2.6.35-0.56.rc6.git1 qemu-kvm-0.12.3-7.fc14.x86_64 How reproducible: Always. Steps to Reproduce: 1. time guestfish -a /dev/null run 2. 3. Actual results: Takes about 1m24. Expected results: 0m08s. Additional info:
This bug appears to have been reported against 'rawhide' during the Fedora 14 development cycle. Changing version to '14'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
Switching back to Rawhide. Still present in latest kernel-2.6.35-0.57.rc6.git5.fc15. The issue is fixes itself if I go back to the 2.6.34 kernel. I also tried upstream qemu compiled from git => same thing. I also tried stracing qemu and qemu-kvm, but there's nothing that I can tell that is interesting going on. Just in a loop doing select and occasional reads/writes to file descriptors.
The root cause is possibly: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=7972995b0c346de76 See discussion here: http://lists.gnu.org/archive/html/qemu-devel/2010-08/threads.html#00133
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
Pretty sure this has long since been improved, so closing
*** This bug has been marked as a duplicate of bug 730128 ***