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The tests for unexpected main thread I/O had exemptions for the specific paths that were being used for shared memory, which would cause it to fail with the changes in this bug. This patch does two things: 1. On Linux, /dev/shm is always tmpfs (a memory filesystem), so it's not going to cause disk I/O, and it's used by glibc to implement the POSIX standard shm_open API. This allows all /dev/shm paths instead of limiting it to a hard-coded prefix. 2. On MacOS, with the patches in this bug, we'll no longer use temporary files for shared memory on current OS versions, but we still need them on older versions to avoid an OS bug (https://crbug.com/project-zero/1671), and they are backed by disk in this case, so we want to allow only the IPC files. However, the path prefix has changed. Differential Revision: https://phabricator.services.mozilla.com/D34628 --HG-- extra : moz-landing-system : lando |
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