Re: Kernel 4.9.x-rt Fully Preemptible Kernel: Issue with gdb and unexpected SIGSTOP signals

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On 2017-01-27 14:04:35 [+0000], Koehrer Mathias (ETAS/ESW5) wrote:
> Hi Sebastian,
Hi Mathias,

> In all the successful loops the lines in the trace look like the lines in the successful (2nd) example below.
> In the error case there is an additional sched_waking and sched_wakeup in the trace.
> Also there is always "prev_state=S" within the forked process.
> In the error case, there is "prev_state=T|K".

That T|K is probably some kind of debug state the program remains until
the debugger puts it back on track. I think the interesting
part ist figure out what decided to send this signal or put the program
into stop-state. Usually a breakpoint, invalid opcode, … causes this
kind of action but my understanding is that you use none of those.

> Thanks
> 
> Best regards
> 
> Mathias

Sebastian
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