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libkqueue allocates the the number of available file descriptors for the fd_map array in linux/platform.c to. That limit is vast in Docker, for complicated reasons: # ulimit -n 1073741816 The library allocates arrays of that size in several places, but in only one does it then also _initialize_ every member of the array (to -1). Since calloc/mmap are optimized to allocate lazily, this means that only that instance winds up immediately actually using ~4GB in memory. The initialization of the int array uses -1 to indicate that a field isn't in use. The patch changes this to use 0 as unused, simply bumping the stored fds by one upon insert and decrementing by one on access, via helpers.
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This also came up over in zeek/zeek#2951, linking here just for reference. |
timwoj
approved these changes
Jun 3, 2025
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Same as #2, but with adjusted merge target as per Tim's request.