[Issue 4890] GC.collect() deadlocks multithreaded program.

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=4890

badlink <andrea.9940 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #35 from badlink <andrea.9940 at gmail.com> ---
I took my time and started digging trough the druntime source to find the
problem. I discovered that core.thread.suspend() sends SIGUSR1 to the thread to
suspend so I launched GDB and tried to catch the signal but GDB never caught
it. I couldn't explain that behavior so I googled "linux sigusr1 not sent" and
Bam! --> https://bbs.archlinux.org/viewtopic.php?id=181142
The people on there already figured that it's a bug in the Gnome Display
Manager which blocks SIGUSR1 for all child applications !
The bug is present in the current package gdm-3.12.2-1 which I am using and is
causing this nasty deadlock in the D garbage collector.
As a quick test I tried to run the testcase in a tty and it worked as expected.
Hopefully the problem will solve itself in the next gdm update.

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