On 2014-04-08 14:42, Manfred Schlaegl wrote: > The race was introduced while development of linux-3.11 by > e8437d7ecbc50198705331449367d401ebb3181f and > e9975fdec0138f1b2a85b9624e41660abd9865d4. > Originally it was found and reproduced on linux-3.12.15 and > linux-3.12.15-rt25, by sending 500 byte blocks with 115kbaud to the > target uart in a loop with 100 milliseconds delay. > > In short: > 1. The consumer flush_to_ldisc is on to remove the head tty_buffer. > 2. The producer adds a number of bytes, so that a new tty_buffer must > be allocated and added by __tty_buffer_request_room. > 3. The consumer removes the head tty_buffer element, without handling > newly committed data.
Hi! Reminder: The Problem is still existent in linux-3.11, 3.12, 3.13. 3.14 and pre 3.15 kernels. The lastly delivered patch cleanly applies to pre 3.15 (torvalds tree) and 3.14(.1). Manfred -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
