Bug 524039
| Summary: | block device cannot be detached from DomU | |||
|---|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Andrew Jones <drjones> | |
| Component: | kernel | Assignee: | Andrew Jones <drjones> | |
| Status: | CLOSED WONTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | |
| Severity: | medium | Docs Contact: | ||
| Priority: | low | |||
| Version: | 13 | CC: | dougsland, gansalmon, itamar, jane.lv, jvillalo, kernel-maint, luyu, markmc, virt-maint | |
| Target Milestone: | --- | |||
| Target Release: | --- | |||
| Hardware: | All | |||
| OS: | Linux | |||
| Whiteboard: | ||||
| Fixed In Version: | Doc Type: | Bug Fix | ||
| Doc Text: | Story Points: | --- | ||
| Clone Of: | ||||
| : | 524040 (view as bug list) | Environment: | ||
| Last Closed: | 2011-06-27 14:23:42 UTC | Type: | --- | |
| Regression: | --- | Mount Type: | --- | |
| Documentation: | --- | CRM: | ||
| Verified Versions: | Category: | --- | ||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | ||
| Cloudforms Team: | --- | Target Upstream Version: | ||
| Embargoed: | ||||
| Bug Depends On: | ||||
| Bug Blocks: | 498969, 524040 | |||
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Description
Andrew Jones
2009-09-17 16:45:07 UTC
This is still happening with 2.6.31.1-56.fc12.x86_64. The backtrace is
identical, but of course with different addresses. The new rip is
0xffffffff8121350b and the offending instruction is
0xffffffff8121350b <debugfs_remove+39>: mov 0x68(%rdi),%rbx
We see that rdi is corrupted, all 6b6b..
The offending code is in debugfs_remove(struct dentry *dentry)
and rdi is the input argument. The function is called from here
static void bdi_debug_unregister(struct backing_dev_info *bdi)
{
debugfs_remove(bdi->debug_stats);
debugfs_remove(bdi->debug_dir);
}
We know we're breaking on the first call, since the backtrace says we're at
bdi_unregister+0x36. So it is seems that the debugfs member(s) are corrupt.
After attaching the device I mounted the debugfs and looked at the stats file
# mount -t debugfs none /sys/kernel/debug/
# cd /sys/kernel/debug/bdi/202:16
# cat stats
BdiWriteback: 0 kB
BdiReclaimable: 0 kB
BdiDirtyThresh: 0 kB
DirtyThresh: 140240 kB
BackgroundThresh: 70120 kB
That looked fine, but still on detach the backtrace appears with the same
corruption.
This problem is a recreatable regression, so it's probably bisectable, but I
think it would take a long time to do the compile-boot-recreate cycle, so
I'll start by looking at suspect patches put in since the previous working rev.
This bug appears to have been reported against 'rawhide' during the Fedora 13 development cycle. Changing version to '13'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping This bug disappeared on it's own for a several kernel revs, but is now back with F13's 2.6.33.2-38.fc13.x86_64. This message is a reminder that Fedora 13 is nearing its end of life. Approximately 30 (thirty) days from now Fedora will stop maintaining and issuing updates for Fedora 13. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as WONTFIX if it remains open with a Fedora 'version' of '13'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version prior to Fedora 13's end of life. Bug Reporter: Thank you for reporting this issue and we are sorry that we may not be able to fix it before Fedora 13 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora please change the 'version' of this bug to the applicable version. If you are unable to change the version, please add a comment here and someone will do it for you. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. The process we are following is described here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping Fedora 13 changed to end-of-life (EOL) status on 2011-06-25. Fedora 13 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed. |