[Bug 1754581] Re: trusty bcache NULL pointer exception

[Launchpad Bug Tracker]

** Merge proposal unlinked:
   https://code.launchpad.net/~raharper/curtin/+git/curtin/+merge/341915

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Title:
  trusty bcache NULL pointer exception

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[Bug 1754581] Re: trusty bcache NULL pointer exception

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~raharper/curtin/+git/curtin/+merge/341915

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https://bugs.launchpad.net/bugs/1754581

Title:
  trusty bcache NULL pointer exception

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[Bug 1754581] Re: trusty bcache NULL pointer exception

[Ryan Harper]

I think it may have always been present; I can recreate this on Trusty
GA kernels; we've changed how we clean/remove bcache devices which I
believe is triggering a new path on Trusty kernels.

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Title:
  trusty bcache NULL pointer exception

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[Bug 1754581] Re: trusty bcache NULL pointer exception

[Joseph Salisbury]

Do you happen to know if this is a regression in Trusty, or if this bug
always existed in Trusty and was fixed in Xenial and newer kernels?

** Changed in: linux (Ubuntu Trusty)
   Status: Incomplete => Triaged

** Changed in: linux (Ubuntu)
   Status: Incomplete => Triaged

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Title:
  trusty bcache NULL pointer exception

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Re: [Bug 1754581] Re: trusty bcache NULL pointer exception

[Ryan Harper]

On Fri, Mar 9, 2018 at 9:49 AM, Joseph Salisbury
 wrote:
> Did this issue start happening after an update/upgrade?  Was there a
> prior kernel version where you were not having this particular problem?

I don't think so; how we're using/clearing/stopping bcache has changed.
I can reproduce this on multiple trusty kernels:

3.13.0-101-generic (buildd@lgw01-40) #148-Ubuntu SMP Thu Oct 20
22:08:32 UTC 2016
3.13.0-107-generic (buildd@lcy01-09) #154-Ubuntu SMP Tue Dec 20
09:57:27 UTC 2016
3.13.0-137-generic (buildd@lgw01-amd64-058) #186-Ubuntu SMP Mon Dec 4
19:09:19 UTC 2017
3.13.0-143-generic (buildd@lcy01-amd64-010) #192-Ubuntu SMP Tue Feb 27
10:45:36 UTC 2018

>
> Would it be possible for you to test the latest upstream kernel? Refer
> to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
> v4.16 kernel[0].

I can confirm that newer kernels do not have this issue:

4.4.0-116-generic (buildd@lcy01-amd64-023) (gcc version 4.8.4 (Ubuntu
4.8.4-2ubuntu1~14.04.4))

Xenial, Artful and Bionic are fine.

>
> If this bug is fixed in the mainline kernel, please add the following
> tag 'kernel-fixed-upstream'.
>
> If the mainline kernel does not fix this bug, please add the tag:
> 'kernel-bug-exists-upstream'.
>
> Once testing of the upstream kernel is complete, please mark this bug as
> "Confirmed".
>
>
> Thanks in advance.
>
> [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16-rc4
>
> ** Changed in: linux (Ubuntu Trusty)
>Importance: Undecided => Medium
>
> ** Changed in: linux (Ubuntu)
>Importance: Undecided => Medium
>
> ** Tags added: kernel-da-key
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1754581
>
> Title:
>   trusty bcache NULL pointer exception
>
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Title:
  trusty bcache NULL pointer exception

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[Bug 1754581] Re: trusty bcache NULL pointer exception

[Joseph Salisbury]

Did this issue start happening after an update/upgrade?  Was there a
prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.16 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as
"Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16-rc4

** Changed in: linux (Ubuntu Trusty)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Tags added: kernel-da-key

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Title:
  trusty bcache NULL pointer exception

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