6 ms·

So, why the bug triggers only with muslc and not other libc ?

• inigyou 2mo ago
  Coincidence. It also only triggers on one machine.
• cyberax 2mo ago
  Probably because musl's allocator exposes single newly faulted pages directly to the app. Other allocators tend to pre-allocate multiple pages at a time, so that the race window is narrower.
  • mbac32768 2mo ago
    Shouldn't tons of applications linked against musl be crashing all over the Internet if it can express this kernel bug?
    • cyberax 2mo ago
      Not necessarily. Another key here is that the allocation is triggered from the libc, while the main app uses another allocator. These kinds of issues with VM are notoriously tricky to replicate. And the main debugging method is "staring intently at the code".