User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0 Build ID: 20170123004004 Steps to reproduce: I downloaded: https://index.taskcluster.net/v1/task/gecko.v2.mozilla-central.latest.firefox.linux64-asan-opt/artifacts/public/build/target.tar.bz2 and tried to run it. Actual results: $ ./firefox ==18808==AddressSanitizer CHECK failed: /builds/slave/moz-toolchain/src/llvm/projects/compiler-rt/lib/asan/asan_rtl.cc:407 "((!asan_init_is_running && "ASan init calls itself!")) != (0)" (0x0, 0x0) <empty stack> Expected results: firefox ASAN starts and is useable

This is on an Ubuntu 16.10 system with mainline kernel 4.9.5.

The same problem exists with the ASAN debug build.

User Agent Mozilla/5.0 (X11; Linux x86_64; rv:54.0) Gecko/20100101 Firefox/54.0 Build ID 20170129185945 Hi Laurent, I wasn't able to reproduce the issue you are experiencing on Ubuntu 14.04 and Ubuntu 16.04. For me Firefox starts up as expected. I did find some pages that might be of interest: https://bugs.archlinux.org/task/50366 https://llvm.org/bugs/show_bug.cgi?id=27310 Could you try to upgrade glibc and see if the issue is reproducible after that?

Thanks for the pointers! Unfortunately upgrading glibc is not an option at the moment and the upcoming Ubuntu 17.04 still has glibc 2.24. Note that ASAN is not completely broken in Debian/Ubuntu: I successfully compiled and ran a small test program with ASAN on Ubuntu 16.10 and Debian sid. Since ASAN works in Debian/Ubuntu for binaries compiled on those systems I do not see how I could report a bug there. Another way to fix this would be for Mozilla to build their ASAN binaries with a more recent toolchain that produces binaries compatible with glibc 2.24.