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314e6ec822
This patch adds a lock on the struct dgram_conn to ensure that an other thread cannot trash a fd or alter its status while the current thread processing it on for send/receive/connect operations. Starting with the 2.4 version this could cause a crash when a DNS request is failing, setting the FD of the dgram structure to -1. If the dgram structure is reused after that, a read access to fdtab[-1] is attempted. The crash was only triggered when compiled with ASAN. In previous versions the concurrency issue also exists but is less likely to crash. This patch must be backported until v2.4 and should be adapt for v < 2.4.