** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
** Changed in: ubuntu-z-systems
Status: Fix Committed => Fix Released
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This bug was fixed in the package linux - 4.4.0-97.120
---
linux (4.4.0-97.120) xenial; urgency=low
* linux: 4.4.0-97.120 -proposed tracker (LP: #1718149)
* blk-mq: possible deadlock on CPU hot(un)plug (LP: #1670634)
- [Config] s390x -- disable CONFIG_{DM, SCSI}_MQ_DEFAULT
Hi @jacobi,
Thank you very much for verifying the fix!
Kleber
** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial
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This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag 'verifica
** Changed in: linux (Ubuntu)
Status: Triaged => Fix Committed
** Changed in: ubuntu-z-systems
Status: Triaged => Fix Committed
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** Changed in: linux (Ubuntu Xenial)
Status: New => Fix Committed
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Title:
blk-mq: possible deadlock on CPU hot(un)plug
Statu
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
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Title:
blk-mq: possible deadlock on CPU hot(un)p
For the record, the following commit fixes the issue for later kernels
(>4.11). What we're seeing with the 4.4 kernel is most likely a
different issue though.
commit ba74b6f7fcc07355d087af6939712eed4a454821 (refs/bisect/new)
Author: Christoph Hellwig
Date: Thu Aug 24 18:07:02 2017 +0200
v
Ok, we will turn these options off for Xenial 4.4 and bring s390x in
line with the other architectures. Note that we *think* that the reason
that they're enabled for s390x is that we initially received a config
file from IBM that we used as a base.
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** Tags removed: kernel-key
** Tags added: kernel-da-key
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Title:
blk-mq: possible deadlock on CPU hot(un)plug
Status in Ubuntu on I
The difference between the Xenial and SUSE kernel is that Xenial has:
CONFIG_SCSI_MQ_DEFAULT=y
CONFIG_DM_MQ_DEFAULT=y
but SUSE:
# CONFIG_SCSI_MQ_DEFAULT is not set
# CONFIG_DM_MQ_DEFAULT is not set
If I disable blk-mq in the Xenial kernel, the test passes.
The easiest 'fix' would be to si
Test passes with 4.13 and 4.12 and SUSE's SLE12 SP2 4.4.21-69-generic kernel.
Test fails with 4.11.
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Juerg Haefliger (juergh)
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I'm able to reproduce the issue locally.
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Title:
blk-mq: possible deadlock on CPU hot(un)plug
Status in Ubuntu on IBM z Systems:
Are you running specific CPU (un)plug tests in parallel with pdebuild?
Can you post the contents of /etc/cpuplugd.conf?
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Title:
blk-
Sorry for the late reply, I'm just getting around looking at this. Yes,
I do have access to the folder now, thanks!
Questions: Is this setup currently working with another distribution and
you're just experiencing issues when running Ubuntu? If so, what's that
other distro and kernel? Also, can yo
I've tried to take a look at at the dump files but the BOX link
referenced in comment #4 doesn't work for me. Either I don't have access
or it has been removed.
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The purpose of testing v4.12-rc7 is to narrow down that last kernel
version that had the hang bug(The bad kernel) and the first kernel
version that did not(The good kernel). This will allow us to identify
the exact commit that fixes the hang bug. This can be accomplished by
performing a "Reverse"
Thanks for the update. Can you test v4.11-rc7? It is available from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11-rc7/
We can perform a "Reverse" kernel bisect if we can identify the last bad
kernel version and the first good one.
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@jac...@de.ibm.com
Can you confirm if v4.11-rc8 fixed the bug or not? Per comment #24 it
ts un-clear if it does or not.
If we find that it is fixed in the v4.11-rc8 kernel, or any other newer
kernel, we can perform a "Reverse" bisect to identify the commit that
fixes the bug, then backport it to
** Tags removed: kernel-da-key
** Tags added: kernel-key
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Title:
blk-mq: possible deadlock on CPU hot(un)plug
Status in Ubuntu on I
I copied over the latest 4_11_0-041100rc8 dump from IBM Box to our Canonical
private file share into my home:
~fheimes/mclint_20170607_kernel_4_11_0-041100rc8_without_openafs.dump.bz2
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** Changed in: ubuntu-z-systems
Status: New => Triaged
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Title:
blk-mq: possible deadlock on CPU hot(un)plug
Status in Ubuntu
** Tags removed: kernel-key
** Tags added: kernel-da-key
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Title:
blk-mq: possible deadlock on CPU hot(un)plug
Status in Ubuntu on I
@jac...@de.ibm.com It would be good to know if this bug is already
fixed in the mainline kernel. Would it be possible for you to test
4.11-rc8? It can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11-rc8/
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Is there an update on this bug?
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Title:
blk-mq: possible deadlock on CPU hot(un)plug
Status in Ubuntu on IBM z Systems:
New
Statu
** Changed in: linux (Ubuntu)
Status: New => Triaged
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Title:
blk-mq: possible deadlock on CPU hot(un)plug
Status in Ubuntu o
I copied over the latest 4.4-72 dump from IBM Box to our Canonical private file
share into my home:
/~fheimes/mclint_20170406_kernel_4_4_0-72_without_openafs.dump.bz2
also reachable via https ...
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** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Tags added: kernel-key
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Title:
blk-mq: possible deadlock on CPU h
An x86-64 fixdep is an artifact of cross compiling.
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Title:
blk-mq: possible deadlock on CPU hot(un)plug
Status in Ubuntu on IBM z
Carsten, I am currently thinking there are two possibilities here.
Maybe three.
1) The fix I submitted is not in the kernel(s) you are running.
2) The s390 compiler does not produce the necessary code to implicitly convert
long int to bool.
3) You are hitting a different bug that just happens to
I'm confused about the release mechanics, I guess. Looking at the git
repository, I see tag "Ubuntu-4.4.0-65.86" (for example) and that tag
commit does contain the fix. Is it then possible for a kernel labeled
"4.4.0-65-generic #86" to NOT contain that patch? Am I making a gross
assumption that the
Due to an emergency CVE rebase, that patch still hasn't made it into the
wild. Here is a test kernel that definitely has the patch
http://kernel.ubuntu.com/~rtg/lp1670634/
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h
Douglas - The patch referred to in LP #1662673 ("percpu-refcount: fix
reference leak during percpu-atomic transition") is in
Ubuntu-4.4.0-65.86 which has yet to be released.
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This looks a lot like the problem in LP #1662673, but that fix is
supposed to be in kernel 4.4.0-65-generic. Might be worth confirming
though. Or perhaps confirming that the fix actually works on the Z
architecture (depends on how the architecture/compiler handles 'bool').
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** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
** Changed in: ubuntu-z-systems
Importance: Undecided => High
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** Tags removed: bot-comment
** Tags added: s390x
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Package changed: ubuntu => linux (Ubuntu)
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