Re: Kernel Bug: unable to handle kernel paging request

[Vyacheslav Dubeyko <slava-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>]

On Jul 26, 2013, at 10:13 PM, Jérôme Poulin wrote:

> Good afternoon,
> 
> I have more informations to add to the bug.
> 

Thank you for additional info.

[snip]
> I was able to reproduce consistently the problem.
> 1. Make a snapshot of a checkpoint and mount it.
> 2. Read from the checkpoint (make a backup).
> 3. Issue apt-get update.
> 

I tried to reproduce the issue but I haven't success in it.
Could you describe the reproducing path in more details?

Moreover, could you share lscp utility output for your NILFS2 partition?

[snip]
> 
> Here are the log files.
> 1. strace from the backup was still reading, it did not stop.
> 2. apt-get-crash.log
> 4362  13:32:04 read(6, " Debugging symbols\nHomepage: htt"..., 32052) = 32052
> 4362  13:32:04 read(6, "tcp-wrappers/libwrap0-dev_7.6.q-"..., 32460) = 32460
> 4362  13:32:04 read(6, "bdevel\nInstalled-Size: 542\nMaint"..., 32710) = 32710
> 4362  13:32:04 read(6, "ian.org>\nArchitecture: i386\nSour"..., 32558) = 32558
> 4362  13:32:04 read(6, "l-Maintainer: XCB Developers <xc"..., 32613) = 32613
> 4362  13:32:04 read(6, "ed: 9m\n\nPackage: libxcb-xvmc0-db"..., 31979) = 31979
> 4362  13:32:04 read(6, "ibz-dev\nFilename: pool/main/x/xf"..., 32335) = 32335
> 4362  13:32:04 read(6, "n: Ubuntu\nSupported: 9m\nTask: my"..., 31903) = 31903
> 4362  13:32:04 read(6, "\nFilename: pool/main/libx/libxpm"..., 32467) = 32467
> 4362  13:32:04 read(6, "buntu/+filebug\nOrigin: Ubuntu\nSu"..., 31982) = 31982
> 4362  13:32:04 read(6, "chpad.net/ubuntu/+filebug\nOrigin"..., 31976) = 31976
> 4362  13:32:04 read(6, "buntu Developers <ubuntu-devel-d"..., 32681) = 32681
> 4362  13:32:04 read(6, "-utils\nDepends: debconf (>= 0.5)"..., 32468) = 32468
> 4362  13:32:04 read(6, "top, mythbuntu-backend-slave, my"..., 31678) = 31678
> 4362  13:32:04 read(6, "d5: 1b0992eebd45ca5ceadc775532a4"..., 32126) = 32126
> 4362  13:32:04 read(6, " all\nSource: munin\nVersion: 2.0."..., 32535) = 32535
> 4362  13:32:04 read(6, "fice-core | openoffice.org-hunsp"..., 32373) = 32373
> 4362  13:32:04 read(6, "ffice.org-dictionaries (1:3.3.0~"..., 32513) = 32513
> 4362  13:32:04 read(6, "hbuntu-backend-master\n\nPackage: "..., 31756) = 31756
> 4362  13:32:04 read(6, "2614b9\nSHA256: bcc70d6577dd06565"..., 32118) = 32118
> 4362  13:32:04 read(6, "17\nSHA256: d903f798a8c38fef2b992"..., 32339) = 32339
> -- End of file --
> 

Could you share the full strace output?

Because in shared part of strace output I can't see any issue or failure.
Moreover, the reported issue occurs in segstor thread. But, usually, segctor activity
takes place after writing or flushing operation. So, it means for me that a reason of the
issue is hidden in another part of the strace output or, maybe, in strace output for
backup operation. Could you share the strace output for backup operation too?

Thanks,
Vyacheslav Dubeyko.

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