Under high load, the value returned by shm_available() can be total garbage, because it is not multiprocess safe. In the tls module, it makes the tests against the low_mem_thresholdX limits randomly return false positives, with errors such as:

ERROR: tls [tls_server.c:273]: tls_fix_connection(): tls: ssl bug #1491 workaround: not enough memory for safe operation: 88

although there is plenty of free shm memory.

This patch solves the issue by adding a safe version of the function.

You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/126

Commit Summary

• mem: add a multiprocess-safe shm_available()
• tls: use multiprocess-safe shm_available()

File Changes

• M mem/shm_mem.c (8)
• M mem/shm_mem.h (5)
• M modules/tls/tls_server.c (4)

Patch Links:

• https://github.com/kamailio/kamailio/pull/126.patch
• https://github.com/kamailio/kamailio/pull/126.diff

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