segfault following debian tutorial

[mm-s]

segfault at step 2 of this tut:

https://www.microsoft.com/net/core/preview#linuxdebian

log:

root@fish# dotnet new console

Welcome to .NET Core!

Learn more about .NET Core @ https://aka.ms/dotnet-docs. Use dotnet --help to see available commands or go to https://aka.ms/dotnet-cli-docs.

Telemetry

The .NET Core tools collect usage data in order to improve your experience. The data is anonymous and does not include command-line arguments. The data is collected by Microsoft and shared with the community.
You can opt out of telemetry by setting a DOTNET_CLI_TELEMETRY_OPTOUT environment variable to 1 using your favorite shell.
You can read more about .NET Core tools telemetry @ https://aka.ms/dotnet-cli-telemetry.

Configuring...

A command is running to initially populate your local package cache, to improve restore speed and enable offline access. This command will take up to a minute to complete and will only happen once.
Decompressing 100% 6845 ms
Expanding 100% 13180 ms
Getting ready...
Segmentation fault
root@fish# dotnet new console -o hwapp
Getting ready...
Segmentation fault

[leecow]

Hi @mm-s - which version of Debian so I can give it a go?

[livarcocc]

@eerhardt

[pinaraf]

I've got the same problem on my computers running Debian sid, and I can not get it running on Debian testing (stretch) because it requires OpenSSL 1.0.0 that is no longer packaged.

[eerhardt]

@bartonjs let me know that we have an issue to support OpenSSL 1.1, but .NET Core 2.0 doesn't support it yet. Debian 9 comes with OpenSSL 1.1, which we don't support.

@leecow @Petermarcu @richlander - our supported versions roadmap says that .NET Core 2.0 supports Debian 8.7+. Is the intention that we support Debian 9 with .NET Core 2.0?

[bartonjs]

@pinaraf The back-compat package seems to be called libssl1.0.2: https://packages.debian.org/stretch/libssl1.0.2. If you install that, do things start working?

[pinaraf]

I removed on my sid the old unmaintained libssl 1.0.0 package, and now I get the error message No usable version of the libssl was found. At least that's not a segfault.
A strace shows that only libssl.so.1.0.0 is searched, with a fallback on libssl.so.10, while the libssl1.0.2 package provides only libssl.so.1.0.2.
I tried to put a symlink, but the symbols changed in libssl 1.0.2 (SSLv3_method missing). That's why Debian did not simply upgrade the previous package and kept my old version installed: the OpenSSL package broke the binary compatibility…
So right now, .NET Core 2.0 may work on Debian 8.(7+), not on Debian 8.7+
Considering that Debian 9 will be out in the next months, supporting it is imho important. And it will come with OpenSSL 1.0.2 as a fallback so you should be able to use it.
https://packages.debian.org/search?keywords=libssl&searchon=names&suite=testing&section=all

[pinaraf]

So, basically, for Debian 9+ corefx must be compiled with OPENSSL_NO_SSL3_METHOD defined…
This was changed in OpenSSL 1.0.2d-2 package back in 2015.

[leecow]

@eerhardt Yes, it's my understanding that Debian 9 will be supported by 2.0.

/cc @richlander @Petermarcu

[bartonjs]

@pinaraf Ah, yeah, I thought that sounded familiar... we fixed it two weeks ago: dotnet/corefx#19070. The latest daily builds should work on Debian 9.

[pinaraf]

@bartonjs And I confirm the latest builds work on Debian 9 with OpenSSL 1.0.2.

[Petermarcu]

closing this because it looks like we've solved the issue.

[brendandburns]

fwiw, I still see this on:

$ dotnet --version
2.1.0-preview1-006491

$ dotnet restore
Segmentation fault

Latest debian stretch (now the stable release)

[eerhardt]

@brendandburns - did you install libssl1.0.2 that @bartonjs recommends above?

[brendandburns]

$ sudo apt-get install libssl1.0.2
[sudo] password for bburns: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libssl1.0.2 is already the newest version (1.0.2l-2).
0 upgraded, 0 newly installed, 0 to remove and 17 not upgraded.

It appears to be the right version. Happy to help with further debugging, let me know what you need me to do.