[Bug 1640382] Re: Segfault event notifier because of race condition

[Dan Streetman]

** Tags removed: sts-sponsor

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  Segfault event notifier because of race condition

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Louis Bouchard]

** Tags removed: sts-sru
** Tags added: sts-sru-done

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Launchpad Bug Tracker]

This bug was fixed in the package qemu - 2.0.0+dfsg-2ubuntu1.31

---
qemu (2.0.0+dfsg-2ubuntu1.31) trusty; urgency=medium

  * aio: fix qemu_bh_schedule() bh->ctx race condition (LP: #1640382)
- d/p/0001-aio-fix-qemu_bh_schedule-bh-ctx-race-condition.patch
  * aio: strengthen memory barriers for bottom half scheduling
(LP: #1587039)
- d/p/0002-aio-strengthen-memory-barriers-for-bottom-half-sched.patch

 -- Seyeong Kim   Thu, 24 Nov 2016 10:44:55
+0100

** Changed in: qemu (Ubuntu Trusty)
   Status: Fix Committed => Fix Released

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Corey Bryant]

** Also affects: cloud-archive/icehouse
   Importance: Undecided
   Status: New

** Changed in: cloud-archive
   Status: Confirmed => Invalid

** Changed in: cloud-archive/icehouse
   Status: New => Fix Committed

** Changed in: cloud-archive/icehouse
   Importance: Undecided => Medium

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Corey Bryant]

** Also affects: cloud-archive/icehouse
   Importance: Undecided
   Status: New

** Changed in: cloud-archive
   Status: Confirmed => Invalid

** Changed in: cloud-archive/icehouse
   Status: New => Fix Committed

** Changed in: cloud-archive/icehouse
   Importance: Undecided => Medium

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  Segfault event notifier because of race condition

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

ii  qemu 2.0.0+dfsg-2ubuntu1.31
amd64fast processor emulator
ii  qemu-keymaps 2.0.0+dfsg-2ubuntu1.31
all  QEMU keyboard maps
ii  qemu-system  2.0.0+dfsg-2ubuntu1.31
amd64QEMU full system emulation binaries
ii  qemu-system-arm  2.0.0+dfsg-2ubuntu1.31
amd64QEMU full system emulation binaries (arm)
ii  qemu-system-common   2.0.0+dfsg-2ubuntu1.31
amd64QEMU full system emulation binaries (common files)
ii  qemu-system-mips 2.0.0+dfsg-2ubuntu1.31
amd64QEMU full system emulation binaries (mips)
ii  qemu-system-misc 2.0.0+dfsg-2ubuntu1.31
amd64QEMU full system emulation binaries (miscelaneous)
ii  qemu-system-ppc  2.0.0+dfsg-2ubuntu1.31
amd64QEMU full system emulation binaries (ppc)
ii  qemu-system-sparc2.0.0+dfsg-2ubuntu1.31
amd64QEMU full system emulation binaries (sparc)
ii  qemu-system-x86  2.0.0+dfsg-2ubuntu1.31
amd64QEMU full system emulation binaries (x86)
ii  qemu-user2.0.0+dfsg-2ubuntu1.31
amd64QEMU user mode emulation binaries
ii  qemu-utils   2.0.0+dfsg-2ubuntu1.31
amd64QEMU utilities


** Tags removed: verification-needed
** Tags added: verification-done

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Robie Basak]

Hello Seyeong, or anyone else affected,

Accepted qemu into trusty-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/qemu/2.0.0+dfsg-
2ubuntu1.31 in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: qemu (Ubuntu Trusty)
   Status: In Progress => Fix Committed

** Tags added: verification-needed

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Robie Basak]

Unsubscribed ~ubuntu-sponsors.

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

** Patch added: "Icehouse_memory_barrier.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1640382/+attachment/4786133/+files/Icehouse_memory_barrier.debdiff

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

** Patch removed: "Trusty_aio_fix_qemu_bh_schedule_race_condition.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1640382/+attachment/4775668/+files/Trusty_aio_fix_qemu_bh_schedule_race_condition.debdiff

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Robie Basak]

Rejected from the Trusty queue as requested. I don't see another upload
to replace it though. Note for the future: you don't need to wait for a
rejection before uploading a replacement; just make it clear to the SRU
team which needs to be rejected and which you need to keep. See
https://launchpad.net/ubuntu/trusty/+queue?queue_state=1 for the current
queue.

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  Segfault event notifier because of race condition

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

oh and uca kilo has fixes.

uca icehouse needs this

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[Bug 1640382] Re: Segfault event notifier because of race condition

[ChristianEhrhardt]

Per discussion with Seyeong Kim this should also apply to Ubuntu Cloud Archive 
Kilo.
This has the first but lacks the second fix.
He can work that out with the UCA Team.

** Also affects: cloud-archive
   Importance: Undecided
   Status: New

** Changed in: cloud-archive
   Status: New => Confirmed

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

Hello seb128

I asked SRU only one commit at first,

but I found this raises bug 1587039(after browsing this symptom), then
now I'm asking to sponsor or sru new debdiff.

the patch in the queue needs to be NAck and be changed to latest one if
is ok.

I asked cpaelzer guide this and he commented to
https://bugs.launchpad.net/cloud-archive/+bug/1587039 about this.

Would you mind if you nack this and change patch?

Thanks a lot

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Sebastien Bacher]

seems there is already an upload in the SRU queue waiting for review
https://launchpad.net/ubuntu/trusty/+queue?queue_state=1_text=qemu

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

It seems that [1] commit introduces [2] ( which is happened in 2.1 as
amad ali said )

and patch [3] is fixing [2]

I think this needs combinded patch but not sure.

[1] 
http://git.qemu.org/?p=qemu.git;a=commit;h=924fe1293c3e7a3c787bbdfb351e7f168caee3e9
[2] https://bugs.launchpad.net/cloud-archive/+bug/1587039
[3] 
http://git.qemu.org/?p=qemu.git;a=commit;h=e8d3b1a25f284cdf9705b7cf0412281cc9ee3a36

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

** Patch added: "Trusty_memory_barrier.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1640382/+attachment/4781413/+files/Trusty_memory_barrier.debdiff

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

Hey Brian

I couldn't find any similar bug on erros.ubuntu.com

but I found LP bug which forwarded 1 step then this.

https://bugs.launchpad.net/cloud-archive/+bug/1587039

does it worth testing above LP bug for this issue as well? ( or mark
duplicate after testing )

Need advice

Thanks a lot

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Brian Murray]

Given that there is no test case in the description, an alternative way
to verify the fix would be to find an crash report in the Error Tracker
matching the same race condition and watching to ensure that the new
package version does not appear in the bucket for that crash.  Could you
review crashes here to find one that matches?

https://errors.ubuntu.com/?release=Ubuntu 14.04=qemu

You might try changing the period from day to month or year.

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Mathew Hodson]

** Changed in: qemu (Ubuntu)
   Status: Invalid => Fix Released

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

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

** No longer affects: qemu (Ubuntu Xenial)

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

rebased and reuploaded

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

** Patch removed: "Trusty_aio_fix_qemu_bh_schedule_race_condition.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1640382/+attachment/4774780/+files/Trusty_aio_fix_qemu_bh_schedule_race_condition.debdiff

** Patch added: "Trusty_aio_fix_qemu_bh_schedule_race_condition.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1640382/+attachment/4775668/+files/Trusty_aio_fix_qemu_bh_schedule_race_condition.debdiff

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

** Tags added: sts-sponsor sts-sru

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

** Changed in: qemu (Ubuntu)
   Status: New => Invalid

** Changed in: qemu (Ubuntu Xenial)
   Status: New => Invalid

** Patch added: "Trusty_aio_fix_qemu_bh_schedule_race_condition.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1640382/+attachment/4774780/+files/Trusty_aio_fix_qemu_bh_schedule_race_condition.debdiff

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  Segfault event notifier because of race condition

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Louis Bouchard]

** Also affects: qemu (Ubuntu Xenial)
   Importance: Undecided
   Status: New

** Also affects: qemu (Ubuntu Trusty)
   Importance: Undecided
   Status: New

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[Bug 1640382] Re: Segfault event notifier because of race condition

[Seyeong Kim]

** Changed in: qemu (Ubuntu Trusty)
   Status: New => In Progress

** Changed in: qemu (Ubuntu Trusty)
 Assignee: (unassigned) => Seyeong Kim (xtrusia)

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