[SR-Users] Failed shared memory allocation even though there's enough free memory

Hello, i'm seeing a lot of failed memory allocations for shared memory after the shared memory has been fully used once (see shmem:max_used_size below). Used_size keeps increasing fast on a heavy loaded server, until it reaches the total_size. From that moment memory allocations start failing and eventually used_size starts dropping. After while, even when there's a lot of free memory, new allocations keep failing. ERROR:tm:build_uac_req: no more share memory (19852) ERROR:tm:t_uac: failed to build message ERROR:presence:send_notify_request: in function tmb.t_request_within ERROR:presence:notify: sending Notify not successful ERROR:presence:publ_notify: Could not send notify for dialog When i request the shmem statistics at such time, there's lots of free memory: shmem:total_size = 268435456 shmem:used_size = 3749696 shmem:real_used_size = 4822288 shmem:max_used_size = 268048584 shmem:free_size = 263613168 shmem:fragments = 62156 This is on 1.5.x, any suggestion on why it keeps failing and how to prevent this error? -- Greetings, Alex Hermann