Bug 678035

Summary:	inotify_add_watch_0 test failing on RHEL 6.1
Product:	Red Hat Enterprise Linux 6	Reporter:	Matthew Booth <mbooth>
Component:	libguestfs	Assignee:	Richard W.M. Jones <rjones>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	6.1	CC:	llim
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-03-07 13:45:18 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	678511
Bug Blocks:

Description Matthew Booth 2011-02-16 15:22:35 UTC

Description of problem:
libguestfs builds in RHEL 6.1 are currently failing due to the failure of test inotify_add_watch_0. Note that no code change or patches have been added since the last successful build, so the failure is presumably down a behavioural change of some dependent component. Top guesses would be: kvm, kernel or glibc.

The test fails in brew, and on my RHEL 6.1 KVM guest. I'm not able to test it on bare metal.

Example failure output:
  1/  1 test_inotify_add_watch_0
libguestfs: trace: available "inotify"
libguestfs: trace: available = 0
libguestfs: trace: blockdev_setrw "/dev/sda"
libguestfs: trace: blockdev_setrw = 0
libguestfs: trace: umount_all
libguestfs: trace: umount_all = 0
libguestfs: trace: lvm_remove_all
libguestfs: trace: lvm_remove_all = 0
libguestfs: trace: mount_options "" "/dev/sdb1" "/"
libguestfs: trace: mount_options = 0
libguestfs: trace: mkdir "/inotify_add_watch"
libguestfs: trace: mkdir = 0
libguestfs: trace: inotify_init 0
libguestfs: trace: inotify_init = 0
libguestfs: trace: inotify_add_watch "/inotify_add_watch" 1073741823
libguestfs: trace: inotify_add_watch = 1
libguestfs: trace: touch "/inotify_add_watch/a"
libguestfs: trace: touch = 0
libguestfs: trace: touch "/inotify_add_watch/b"
libguestfs: trace: touch = 0
libguestfs: trace: inotify_files
libguestfs: trace: inotify_files = [""]
test_inotify_add_watch_0: short list returned from command
test_inotify_add_watch_0 FAILED

Version-Release number of selected component (if applicable):
libguestfs-1.7.17-12.el6

Comment 1 Matthew Booth 2011-02-16 17:05:25 UTC

Minimal testcase with guestfish:

$ dd if=/dev/zero of=test.img bs=1M count=10
$ guestfish -a test.img

><fs> run
open /dev/kvm: No such file or directory
Could not initialize KVM, will disable KVM support
Using CPU model "cpu64-rhel6"
><fs> mkfs ext2 /dev/vda
><fs> mount /dev/vda /
><fs> inotify-init 0
><fs> mkdir /inotify_add_watch
><fs> inotify-add-watch /inotify_add_watch 1073741823
1
><fs> touch /inotify_add_watch/a
><fs> touch /inotify_add_watch/b
><fs> inotify-files 
><fs> quit

This same test succeeds with libguestfs-1.8.1-1.fc14 in F14.

Comment 2 Matthew Booth 2011-02-16 17:06:50 UTC

Note that changing inotify-init some number larger than zero in the above test doesn't make it work.

Comment 3 Richard W.M. Jones 2011-03-07 13:44:59 UTC

Closing this as it appears the problem was caused by
a kernel regression which has been fixed.