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Message-ID: <CALqoRwy+zePYh5-iA9YTe9R448RvBRP=j+fk9s9iFoiN=5Ti9g@mail.gmail.com>
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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