Mono developers,
While trying to track down a mono internal problem related to signals and
garbage collection, I've been doing some testing with the latest 3.2.1 release.
In an attempt to find a test case that's most interesting to this team, I'm
running OpenSuse 12.3 and repeatedly unpacking 3.2.1, running "configure",
"make", and "make check". I let this run for ~24 hours which resulted in 58
builds/checks. Every one failed one test or another in "make check". This is in
stark contrast to the status reported by monkey wrench for
"mono-dist-3.2.1-release" on OpenSuse (all green).
I'm new to OpenSuse, but I just did a fresh install and "zypper -n in -t
pattern devel_C_C++" to get a development environment. Other than that, I'm
just running the Makefile appended below over and over again.
My system is,
# cat /etc/SuSE-release
openSUSE 12.3 (x86_64)
VERSION = 12.3
CODENAME = Dartmouth
# uname -a
Linux linux-mono.nirvanix.com 3.7.10-1.1-desktop #1 SMP PREEMPT Thu Feb 28
15:06:29 UTC 2013 (82d3f21) x86_64 x86_64 x86_64 GNU/Linux
The mono I end up with is,
# mono --version
Mono JIT compiler version 3.2.1 (tarball Tue Aug 6 14:43:27 MDT 2013)
Copyright (C) 2002-2012 Novell, Inc, Xamarin Inc and Contributors.
www.mono-project.com
TLS: __thread
SIGSEGV: altstack
Notifications: epoll
Architecture: amd64
Disabled: none
Misc: softdebug
LLVM: supported, not enabled.
GC: sgen
Here's a count of the failures from those runs,
25 bug-10127.exe
13 gsharing-valuetype-layout.exe
4 sgen-weakref-stress.exe|ms-par
3 sgen-weakref-stress.exe|ms-split
3 sgen-weakref-stress.exe|ms-conc
2 sgen-weakref-stress.exe|plain
2 delegate2.exe
1 sgen-weakref-stress.exe|ms-split-95
1 sgen-weakref-stress.exe|ms-conc-split
1 sgen-bridge.exe|ms-split
1 appdomain-unload.exe
Note that the total number of test failures is greater than the 58 iterations
because sometimes more than one test failed per iteration. I didn't dig into
the failures, but note that bug-10127.exe fails on 43% of the runs (25/58).
I'm most interested in assertion failures in the bug-10127.exe failures as they
look similar to my application failures on another platform. Specifically,
here's a manual recompile and run of that test (it doesn't fail every time),
# mcs bug-10127.cs
# mono bug-10127.exe
Starting cache testers
* Assertion at sgen-os-posix.c:60, condition `info->doing_handshake' not met ...
=================================================================
Got a SIGABRT while executing native code. This usually indicates a fatal error
in the mono runtime or one of the native libraries used by your application.
=================================================================
Here are a few examples of the bug-10127.exe failure stack traces from manual
runs as described above,
http://sprunge.us/iHFX
http://sprunge.us/cOEU
http://sprunge.us/VKRg
For completeness, the only thing that I can think of that may be different
about my very simple configuration is that my OpenSuse system is a virtual
machine (4 core, 4 GB RAM) running on VMware ESXi. I suspect that this is
subtly altering the timing of execution and exposing latent bugs.
These appears to be related,
https://github.com/mono/mono/pull/720
http://stackoverflow.com/questions/17937222/mono-3-2-0-process-crashes-on-sgen-os-posix-info-handshake-not-met
>From what I've described, am I doing anything wrong? Anyone else seeing
>something similar?
-Charles
--- snip ---
MONO_VER=3.2.1
MONO_DIST=mono-${MONO_VER}.tar.bz2
MONO_DIR=mono-${MONO_VER}
all: check.done
extract.done:
@echo ------------------------------------------------------------
@echo EXTRACT
@echo ------------------------------------------------------------
tar jxvf ${MONO_DIST} 2>&1
touch extract.done
configure.done: extract.done
@echo ------------------------------------------------------------
@echo CONFIGURE
@echo ------------------------------------------------------------
(cd ${MONO_DIR} && ./configure --prefix=/tmp/mono) 2>&1
touch configure.done
build.done: configure.done
@echo ------------------------------------------------------------
@echo BUILD
@echo ------------------------------------------------------------
make -C ${MONO_DIR} -j 4 2>&1
touch build.done
check.done: build.done
@echo ------------------------------------------------------------
@echo CHECK
@echo ------------------------------------------------------------
make -C ${MONO_DIR} check 2>&1
touch check.done
.PHONY: clean
clean:
@echo ------------------------------------------------------------
@echo CLEAN
@echo ------------------------------------------------------------
-rm -f *.log *.done *~
-rm -rf ${MONO_DIR}
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