On Tue, 28 Feb 2023 12:23:46 +0100 Eric Dumazet wrote: > This report mentions sendpage, but sendmsg() would have the same issue. > > A thread might be blocked in sk_stream_wait_memory() with the mutex > held, for an arbitrary amount of time, > say if the remote peer stays in RWIN 0 for hours. > > This prevents tx_work from making progress, and > tls_sw_cancel_work_tx() would be stuck forever. > > The consensus is that the kernel shouts a warning if a thread has been > waiting on a mutex > more than 120 seconds (check_hung_uninterruptible_tasks()) Thanks for explaining, let's see if I can hack a fix together..
