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On FreeBSD, Firefox uses the kern.proc.pathname.PID sysctl to get the binary path (where PID can be the actual pid or -1). The user path is /usr/local/bin/firefox which is a symlink to /usr/local/lib/firefox/firefox. This was failing because we were not handling this MIB. That meant that the sysctl returned the path for the binary of the running tool (e.g., /home/paulf/scratch/valgrind/memcheck/memcheck-amd64-freebsd). Firefox looks for files in the same directory. Since it was the wrong directory it failed to find them and exited. I also noticed a lot of _umtx_op errors. On analysis they are spurious. The wake ops take an "obj" argument, a pointer to a variable. They only use the address as a key for lookups and don't read the contents.
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