Process hangs when logging buffer overflow happens and Dispathcer thread has died

[rohitnitk2004]

Async appender checks dispatcher thread liveness and then only adds to logging buffer.

However If the dispatcher thread dies just after this liveness check and logging buffer is already full ( in multi-threaded application with too much logging happening ) then this thread gets blocked forever ( refer 1st snapshot)

To make it worse; it keeps holding a lock on Rootlogger which makes other threads blocked as well ( refer 2nd snapshot )

[ceki]

Thank you for this report. What leads you to believe that the dispatcher thread has died?

[rohitnitk2004]

took thread dump of running application and saw below as per snapshot. We have a uncaught exception handler which logs error.

in this cases; dispatcher thread is not yet "dead" and like other logging threads; it is stuck trying to get lock on root logger. However it reached here because of an uncaught exception and in absence of uncaught exception handler; it would have died and led to same problem for other logging threads.