Christian Krause wrote:
Hi, Recently I found a problem with evince and a special pdf file ([1]). The backtrace (see below, [2]) indicates that 2 threads call at the same time functions of the fontconfig library when the crash occurs. So I have 2 questions: 1. Is fontconfig thread-safe? Is there something special where developers of multi-threaded applications must take care of? 2. Please can you have a look at the backtrace and give me a hint where I can start looking for the problem?
fontconfig is not thread-safe. One way to fix this problem would be to have a lock which surrounds all calls to fontconfig.
I can't actually see in the trace what might be causing the crash. But I'm sure that arbitrary things can happen when you call fontconfig from multiple threads.
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