Bug 905219

Summary: encfs burns CPU on kernel-3.8.0-0.rc5.git0.1.fc19.x86_64
Product: [Fedora] Fedora Reporter: Mace Moneta <moneta.mace>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED RAWHIDE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: rawhideCC: gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda, moneta.mace, schaiba
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Hardware: x86_64   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2013-01-30 22:52:55 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
I straced the encfs process for a few seconds none

Description Mace Moneta 2013-01-28 21:51:29 UTC
Created attachment 689365 [details]
I straced the encfs process for a few seconds

Description of problem:

When running with kernel-3.8.0-0.rc5.git0.1.fc19.x86_64 on F18 and using encfs, the encfs process consumes a CPU (~25% CPU on my core2 quad) while mostly idle.

Version-Release number of selected component (if applicable):

kernel-3.8.0-0.rc5.git0.1.fc19.x86_64

How reproducible:


Steps to Reproduce:
1. Install kernel-3.8.0-0.rc5.git0.1.fc19.x86_64
2. Mount an encfs directory
3. Point some apps at the corresponding unencrypted directory
4. Have them occasionally manipulate some files
  
Actual results:

100% of one core CPU utilization.

Expected results:

Near zero CPU utilization, as on kernel-3.7.4-204.fc18.x86_64

Additional info:

Comment 1 Mace Moneta 2013-01-28 22:21:43 UTC
I should have noted that the filesystem in use (in which the encfs directories exist) is btrfs.

Comment 2 Mace Moneta 2013-01-30 22:52:55 UTC
Problem no longer occurs on kernel-3.8.0-0.rc5.git1.2.fc19.x86_64, closing.