[Bug 1493943] Re: Mono reliably crashes on certain multithreaded code in 3.13.0-62-generic

[Chris J Arges]

** Changed in: linux (Ubuntu Vivid)
 Assignee: Chris J Arges (arges) => (unassigned)

** Changed in: linux-lts-utopic (Ubuntu Trusty)
 Assignee: Chris J Arges (arges) => (unassigned)

** Changed in: linux (Ubuntu Trusty)
 Assignee: Chris J Arges (arges) => (unassigned)

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Title:
  Mono reliably crashes on certain multithreaded code in
  3.13.0-62-generic

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[Bug 1493943] Re: Mono reliably crashes on certain multithreaded code in 3.13.0-62-generic

[Samuel Greenway]

Seems this is a reoccurring issues.

Ref. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1450584.

Opensimulator.org project is still seeing issues with crashes giving a 
mono-sgen error.
http://opensimulator.org/mantis/view.php?id=7519

** Bug watch added: opensimulator.org/mantis/ #7519
   http://opensimulator.org/mantis/view.php?id=7519

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Title:
  Mono reliably crashes on certain multithreaded code in
  3.13.0-62-generic

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[Bug 1493943] Re: Mono reliably crashes on certain multithreaded code in 3.13.0-62-generic

[Chris J Arges]

Douglas,
A reproducer doesn't have to be public if you are willing to verify the bug.
I can provide a test build with the identified patch if you'd like. Let me know.
--chris

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Title:
  Mono reliably crashes on certain multithreaded code in
  3.13.0-62-generic

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[Bug 1493943] Re: Mono reliably crashes on certain multithreaded code in 3.13.0-62-generic

[Douglas Roffel]

Unfortunately, I was able to reproduce my segfault with a kernel version
before the parent's bug was introduced. This implies my issue lies
somewhere else. I'm pretty sure its something to do with threading in
the kernel, but the referenced issue is not this one.

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

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

** Changed in: linux (Ubuntu Vivid)
   Status: In Progress => Incomplete

** Changed in: linux-lts-utopic (Ubuntu Trusty)
   Status: In Progress => Incomplete

** Description changed:

  SRU Justification:
  
  [Impact]
- This bug appears to be due to a regression of the fix for:
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1450584
- 
- Specifically, the edit history for
- https://github.com/torvalds/linux/commits/master/arch/x86/kernel/pvclock.c
- (one of the files that the parent mentioned needed patching for the fix)
- shows that the changes added for the fix were removed one month later.
+ EDIT: The referenced bug was not causing the crashing.
  
  [Fix]
- $ git describe --contains 73459e2a1ada09a68c02cc5b73f3116fc8194b3d
- v4.1-rc2~14^2
+ None yet.
  
  [Test Case]
- run mono in a multithreaded kvm vm
- bug 1450584 has some testcases
+ If I can get a test case working without giving the code for my company's 
internal application, I will post it.
  
  --
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-62-generic 3.13.0-62.102
  ProcVersionSignature: Ubuntu 3.13.0-62.102-generic 3.13.11-ckt24
  Uname: Linux 3.13.0-62-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.12
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC0:  droffel1829 F pulseaudio
  CurrentDesktop: Unity
  Date: Wed Sep  9 10:28:21 2015
  HibernationDevice: RESUME=UUID=c916917a-07a8-42ad-807a-b2f7c4ff9807
  InstallationDate: Installed on 2015-04-15 (146 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
  IwConfig:
   eth0  no wireless extensions.
  
   lono wireless extensions.
  Lsusb:
   Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-62-generic 
root=UUID=51deb493-21fe-4016-9855-90d738549bff ro quiet splash 
crashkernel=384M-:128M crashkernel=384M-:128M vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-62-generic N/A
   linux-backports-modules-3.13.0-62-generic  N/A
   linux-firmware 1.127.15
  RfKill:
  
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
  
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: 
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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Title:
  Mono reliably crashes on certain multithreaded code in
  3.13.0-62-generic

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[Bug 1493943] Re: Mono reliably crashes on certain multithreaded code in 3.13.0-62-generic

[Douglas Roffel]

I have modified the description and status to Incomplete, as I cannot
provide an adequate test (that doesn't contain proprietary code) to
reproduce the issue at this time.

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Title:
  Mono reliably crashes on certain multithreaded code in
  3.13.0-62-generic

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[Bug 1493943] Re: Mono reliably crashes on certain multithreaded code in 3.13.0-62-generic

[Joseph Salisbury]

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

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Title:
  Mono reliably crashes on certain multithreaded code in
  3.13.0-62-generic

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[Bug 1493943] Re: Mono reliably crashes on certain multithreaded code in 3.13.0-62-generic

[Chris J Arges]

I'll work on getting this SRU'ed to the appropriate releases. Could you
please share your test-case for reproducing this issue?

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Title:
  Mono reliably crashes on certain multithreaded code in
  3.13.0-62-generic

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[Bug 1493943] Re: Mono reliably crashes on certain multithreaded code in 3.13.0-62-generic

[Chris J Arges]

This is commit referred to:
commit 73459e2a1ada09a68c02cc5b73f3116fc8194b3d
Author: Paolo Bonzini 
Date:   Thu Apr 23 13:20:18 2015 +0200

x86: pvclock: Really remove the sched notifier for cross-cpu migrations

This reverts commits 0a4e6be9ca17c54817cf814b4b5aa60478c6df27
and 80f7fdb1c7f0f9266421f823964fd1962681f6ce.

$ git describe --contains 73459e2a1ada09a68c02cc5b73f3116fc8194b3d
v4.1-rc2~14^2

Since bug 1450584 backported those commits to v3.13, v3.16, v3.19 we'll have to 
apply this patch to all series.
This is already fixed in Wily since its v4.2.

** Also affects: linux (Ubuntu Vivid)
   Importance: Undecided
   Status: New

** Also affects: linux (Ubuntu Precise)
   Importance: Undecided
   Status: New

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

** No longer affects: linux (Ubuntu Precise)

** Also affects: linux-lts-utopic (Ubuntu)
   Importance: Undecided
   Status: New

** No longer affects: linux-lts-utopic (Ubuntu Vivid)

** Changed in: linux-lts-utopic (Ubuntu)
   Status: New => Invalid

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

** Changed in: linux (Ubuntu Vivid)
   Status: New => In Progress

** Changed in: linux-lts-utopic (Ubuntu Trusty)
   Status: New => In Progress

** Changed in: linux (Ubuntu)
   Status: Confirmed => Fix Released

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

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

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

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

** Changed in: linux (Ubuntu Trusty)
 Assignee: (unassigned) => Chris J Arges (arges)

** Changed in: linux (Ubuntu Vivid)
 Assignee: (unassigned) => Chris J Arges (arges)

** Changed in: linux-lts-utopic (Ubuntu Trusty)
 Assignee: (unassigned) => Chris J Arges (arges)

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Title:
  Mono reliably crashes on certain multithreaded code in
  3.13.0-62-generic

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[Bug 1493943] Re: Mono reliably crashes on certain multithreaded code in 3.13.0-62-generic

[Chris J Arges]

** Description changed:

+ SRU Justification:
+ 
+ [Impact]
  This bug appears to be due to a regression of the fix for:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1450584
  
  Specifically, the edit history for
  https://github.com/torvalds/linux/commits/master/arch/x86/kernel/pvclock.c
  (one of the files that the parent mentioned needed patching for the fix)
  shows that the changes added for the fix were removed one month later.
+ 
+ [Fix]
+ $ git describe --contains 73459e2a1ada09a68c02cc5b73f3116fc8194b3d
+ v4.1-rc2~14^2
+ 
+ [Test Case]
+ run mono in a multithreaded kvm vm
+ bug 1450584 has some testcases
+ 
+ --
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-62-generic 3.13.0-62.102
  ProcVersionSignature: Ubuntu 3.13.0-62.102-generic 3.13.11-ckt24
  Uname: Linux 3.13.0-62-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.12
  Architecture: amd64
  AudioDevicesInUse:
-  USERPID ACCESS COMMAND
-  /dev/snd/controlC0:  droffel1829 F pulseaudio
+  USERPID ACCESS COMMAND
+  /dev/snd/controlC0:  droffel1829 F pulseaudio
  CurrentDesktop: Unity
  Date: Wed Sep  9 10:28:21 2015
  HibernationDevice: RESUME=UUID=c916917a-07a8-42ad-807a-b2f7c4ff9807
  InstallationDate: Installed on 2015-04-15 (146 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
  IwConfig:
-  eth0  no wireless extensions.
-  
-  lono wireless extensions.
+  eth0  no wireless extensions.
+ 
+  lono wireless extensions.
  Lsusb:
-  Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
-  Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+  Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
+  Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-62-generic 
root=UUID=51deb493-21fe-4016-9855-90d738549bff ro quiet splash 
crashkernel=384M-:128M crashkernel=384M-:128M vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-3.13.0-62-generic N/A
-  linux-backports-modules-3.13.0-62-generic  N/A
-  linux-firmware 1.127.15
+  linux-restricted-modules-3.13.0-62-generic N/A
+  linux-backports-modules-3.13.0-62-generic  N/A
+  linux-firmware 1.127.15
  RfKill:
-  
+ 
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
-  
+ 
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: 
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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Title:
  Mono reliably crashes on certain multithreaded code in
  3.13.0-62-generic

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[Bug 1493943] Re: Mono reliably crashes on certain multithreaded code in 3.13.0-62-generic

[Douglas Roffel]

Chris: My test case unfortunately depends on an internal application
that I am not able to share the code of. At the moment, I am building an
older kernel version to test whether the test works properly on it. I
will respond once I've determined that the bug I referenced is indeed
the same one i'm dealing with here.

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Title:
  Mono reliably crashes on certain multithreaded code in
  3.13.0-62-generic

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