i have the same problem, this time it has been running for 17 day.
Oct 24 05:54:05 Tower nginx: 2020/10/24 05:54:05 [error] 5567 # 5567: nchan: Out of shared memory while allocating channel / disks. Increase nchan_max_reserved_memory.
Oct 24 05:54:05 Tower nginx: 2020/10/24 05:54:05 [error] 5567 # 5567: * 3548619 nchan: error publishing message (HTTP status code 507), client: unix :, server:, request : "POST / pub / disks? Buffer_length = 1 HTTP / 1.1", host: "localhost"
Oct 24 05:54:06 Tower nginx: 2020/10/24 05:54:06 [crit] 5567 # 5567: ngx_slab_alloc () failed: no memory
Oct 24 05:54:06 Tower nginx: 2020/10/24 05:54:06 [error] 5567 # 5567: shpool alloc failed