Messages in this thread | | | Subject | RT and Signals | From | Daniel Walker <> | Date | 11 Apr 2005 10:14:27 -0700 |
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I'm not sure if this has changed at all in recent RT patches, but I've noticed several issues popping up that are related to the timer interrupt sending signals , one in particular is the fact that send_sig() calls into __cache_alloc() which has it's interrupt disable protections removed in RT . I've observed slab corruption due to this while running lmbench and LTP .
Another issue was a livelock related to the timer interrupt calling send_sig which locks tasklist_lock and siglock , which are both mutexes (deadlock detect was on , but didn't trigger)..
LTP and lmbench seem to bring all these issues to the surface, but they are all different depending on the architecture. I've been treating the symptoms , but not the disease .. Ultimately , we need some protections, in signal deliver, to stop the timer interrupt ..
Daniel
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