Bug 1018615

Summary: unable to handle kernel NULL pointer dereference at 000000000000006c (bch_insert_data)
Product: [Fedora] Fedora Reporter: pavel.nedr
Component: kernelAssignee: Igor Gnatenko <ignatenko>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: 20CC: gansalmon, ignatenko, itamar, jonathan, jreznik, kernel-maint, madhu.chinakonda, marcelo.barbosa, myroslav, pavel.nedr, rolf
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: kernel-3.11.5-301.fc20 Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2013-10-31 10:26:56 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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dmesg none

Description pavel.nedr 2013-10-13 20:43:38 UTC 
Created attachment 811796 [details]
dmesg

Description of problem:
My Bcache depends on if I have many Copy files.

First, cp copies the files very quickly then to be getting slower,
that goes to halt!

I give in another console "sync", the command did not returns.

Version-Release number of selected component (if applicable):
bcache-tools-0-0.14.20130909git.fc20.x86_64

How reproducible:
doing the test: https://fedoraproject.org/wiki/QA:Testcase_bcache-tools_home_on_bcache_(no_LVM)
then try to copy a lot of files
Comment 1 pavel.nedr 2013-10-13 20:47:22 UTC 
uname -a
Linux bb.lan 3.11.4-301.fc20.x86_64 #1 SMP Thu Oct 10 15:09:17 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Comment 2 Igor Gnatenko 2013-10-13 20:49:19 UTC 
Bug present in the kernel bcache realisation.

http://thread.gmane.org/gmane.linux.kernel.bcache.devel/2049

but in 3.11.4 patch was applied:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/md/bcache/request.c?id=c0f04d88e46d14de51f4baebb6efafb7d59e9f96

Rolf or I will send message to upstream bcache mailing list.
Comment 3 Igor Gnatenko 2013-10-13 21:32:54 UTC 
Pinged upstream: http://thread.gmane.org/gmane.linux.kernel.bcache.devel/2128

probably fix: http://thread.gmane.org/gmane.linux.kernel.bcache.devel/2113

Will build kernel w/ patch.
Comment 4 Igor Gnatenko 2013-10-13 21:36:16 UTC 
test this kernel: http://koji.fedoraproject.org/koji/buildinfo?buildID=470953
Comment 5 Rolf Fokkens 2013-10-15 18:23:10 UTC 
kernel-3.11.5-301.fc20 has been submitted as an update for Fedora 20.
https://admin.fedoraproject.org/updates/kernel-3.11.5-301.fc20