Topic: sigsev on widelands start

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kaputtnik
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Joined: 2013-02-18, 20:48 UTC+1.0
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OS: Archlinux
Version: current master
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Posted at: 2020-02-16, 10:14 UTC+1.0

For some reason i can't start widelands anymore. Tried a release build and a debug build, always with deleting the whole directory build. Compiled with compile.sh -r -w and compile.sh -a -w`. Both builds are crashing immediately:

$> ./widelands 
This is Widelands Version r24427[0b5ae14@master] (Debug)
Set home directory: /home/kaputtnik/.widelands
Set configuration file: /home/kaputtnik/.widelands/config
Widelands executable directory: /home/kaputtnik/widelands-repo/widelands/
Speicherzugriffsfehler (Speicherabzug geschrieben)

A backtrace is attached.

Since glibc is somehow involved and there is another problem with the newest glibc version, i have also tried to downgrade glibc, recompiled, but the crash persists.

Anyone else facing this problem?

Attachment: text/plain
backtrace.txt (1.6 KB)
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ModellbahnerTT

Joined: 2009-07-19, 11:58 UTC+2.0
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 Posted at: 2020-02-16, 11:31 UTC+1.0

Which Compiler do you use? If it is gcc 9 the problem is known.

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kaputtnik
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Joined: 2013-02-18, 20:48 UTC+1.0
Posts: 2700
OS: Archlinux
Version: current master
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Posted at: 2020-02-16, 18:17 UTC+1.0

Yes, i have gcc9 installed. But i think the problem is the same as https://github.com/widelands/widelands/issues/3518

A workaround is to set the environment variable XDG_DATA_DIRS before starting widelands:

export XDG_DATA_DIRS=
./widelands
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niektory
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Joined: 2019-06-03, 20:06 UTC+2.0
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Posted at: 2020-02-16, 18:44 UTC+1.0

I think I know what the problem is. In this line:

    environment = getenv("XDG_DATA_DIRS");

environment is a std::string variable, but getenv returns a C-style string, or NULL (a null pointer) if the environment variable is not set. A std::string variable is not a pointer, you can't assign NULL to it, therefore it crashes in this case.

Edited: 2020-02-16, 18:51 UTC+1.0
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GunChleoc
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Posted at: 2020-02-21, 19:04 UTC+1.0

Pull request is up: https://github.com/widelands/widelands/pull/3700

Busy indexing nil values

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