Invoking writeln() from a lot of threads running concurrently --> crash

[Mengu]

On Saturday, 9 December 2017 at 10:36:08 UTC, Messenger wrote:
> On Saturday, 9 December 2017 at 09:38:05 UTC, IM wrote:
>> For purposes of debugging, I'm using writeln() to print stuff 
>> out from tasks running concurrently on many threads. At some 
>> point it crashes with the following stack trace:
>>
>> Thread 4 received signal SIGUSR1, User defined signal 1.
> [...]
>> Bug in phobos?
>
> Is that a crash or just thread 4 receiving SIGUSR1? (GC signal)
>
> If so you just need to tell gdb not to stop on that. ("handle 
> SIGUR1 SIGUSR2 nostop", place it in ~/.gdbinit)

i've been bitten many times by this. thanks to the folks on irc, 
it now lives in gdbinit.