Date: Tue, 24 Mar 2020 14:20:08 +0100 From: Julio Guerra <julio@...een.com> To: musl@...ts.openwall.com Subject: Re: [Bug] Do not ignore membarrier return code Hello Rich, Here are more details on what we did to reproduce the issue. You can clone this gist https://gist.github.com/vdeturckheim/d420310e272f525824d7e92e7e875024 and have a look at the run.sh file example in order to get started with it. The test.js file does a require of the js bindings of grpc, which involves the dlopen. What we observed yesterday with this example was: - It crashed approximately 9 times out of 10 on aws codebuild with the machine BUILD_GENERAL1_SMALL (3 GB memory, 2 vCPUs). - It worked all the time by only adding membarrier to the seccomp profile of the docker run. But I wanted to give you more details with stack traces of the segfault by retrying today with gdb but I cannot reproduce it anymore...! I'll retry later to see if I see the error again... If what you say about membarrier is true, I think there may be some synchronization side-effect of the syscall since, afaik, node uses threads in order to load the shared libraries in the libuv. -- Julio
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