Bug 29008 - mono randomly crashes since linux 3.16.0-31-generic
Summary: mono randomly crashes since linux 3.16.0-31-generic
Alias: None
Product: Runtime
Classification: Mono
Component: GC ()
Version: 3.12.0
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2015-04-11 17:39 UTC by computerzerstoerer
Modified: 2015-04-28 15:09 UTC (History)
4 users (show)

Is this bug a regression?: ---
Last known good build:

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Description computerzerstoerer 2015-04-11 17:39:59 UTC

Several weeks ago, I wanted to try ASP.NET vNext on Linux. I tested on VirtualBox and bhyve (on two entirely different host machines), with Ubuntu 12.04, 14.04 and 14.10, both inside and outside of docker. The "dnu/kpm restore" would always crash with really weird errors: Inexplicable exceptions everywhere around the TLS stack (featuring null reference exceptions in Monitor.TryEnter), again and again, up to the big crescendo in which the entire mono runtime blows up in a segfault.

Today, I ran another attempt but to no avail. Once again, "dnu restore" failed in this strange way. A friend however succeeded without problems, so I started investigating and the culprit seems to be mono's sgen GC. While everything works flawlessly on kernel version 3.16.0-30-generic, dnu crashes on 3.16.0-31-generic (the same installation, everything unchanged, just booting a different kernel). However, it can be fixed by compiling mono with the boehm GC instead of sgen.

kernel \ mono gc	sgen	boehm
3.16.0-30-generic	☑	☐ (not tested)
3.16.0-31-generic	☒	☑

A collection of my finest dnu crashes: https://gist.github.com/main--/dd7d8f81654789a977d9
Today's testing was run on a fully updated Ubuntu trusty. Mono 3.12.1, the sgen one from the APT repo and the boehm one self-compiled.
Comment 1 Zoltan Varga 2015-04-11 17:43:46 UTC
Using the upcoming mono 4.0 release might fix some of these problems.
Comment 2 Alexander Kyte 2015-04-20 17:00:13 UTC
If you could provide your dnu version and the config you're trying to restore, I can look whether your problem persists on the newest mono release.
Comment 3 computerzerstoerer 2015-04-21 13:23:56 UTC
I was unable to reproduce the issue with the mono 4 alpha 1 tarball.
Comment 4 computerzerstoerer 2015-04-28 15:09:42 UTC
Fixed in mono 4.