https://issues.dlang.org/show_bug.cgi?id=20270

igor.khasilev@gmail.com changed:

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                 CC|                            |igor.khasilev@gmail.com

--- Comment #1 from igor.khasilev@gmail.com ---
May (or may not) be related https://issues.dlang.org/show_bug.cgi?id=20256 if scanthread do not block SIGUSR1 and SIGUSR2

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https://issues.dlang.org/show_bug.cgi?id=20270

--- Comment #2 from Vladimir Panteleev <dlang-bugzilla@thecybershadow.net> ---
(In reply to igor.khasilev from comment #1)
> May (or may not) be related https://issues.dlang.org/show_bug.cgi?id=20256 if scanthread do not block SIGUSR1 and SIGUSR2

Unfortunately `digger run stable+druntime#2813 -- dmd -run test` still hangs.

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https://issues.dlang.org/show_bug.cgi?id=20270

--- Comment #3 from Rainer Schuetze <r.sagitario@gmx.de> ---
I cannot reproduce locally in a VM. Does the problem go away with --DRT-gcopt=parallel:0 ?

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https://issues.dlang.org/show_bug.cgi?id=20270

--- Comment #4 from Vladimir Panteleev <dlang-bugzilla@thecybershadow.net> ---
(In reply to Rainer Schuetze from comment #3)
> Does the problem go away with --DRT-gcopt=parallel:0 ?

Yes.

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https://issues.dlang.org/show_bug.cgi?id=20270

--- Comment #5 from Vladimir Panteleev <dlang-bugzilla@thecybershadow.net> ---
(In reply to Rainer Schuetze from comment #3)
> I cannot reproduce locally in a VM.

>From experimenting with taskset, it seems that there need to be at least 5
physical cores to run threads on for this bug to be reproduced. (Does not reproduce with `taskset f` but does reproduce with `taskset 1f`.)

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https://issues.dlang.org/show_bug.cgi?id=20270

Dlang Bot <dlang-bot@dlang.rocks> changed:

           What    |Removed                     |Added
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           Keywords|                            |pull

--- Comment #6 from Dlang Bot <dlang-bot@dlang.rocks> ---
@rainers created dlang/druntime pull request #2816 "fix Issue 20270 - [REG2.087] Deadlock in garbage collection when runn…" fixing this issue:

- fix Issue 20270 - [REG2.087] Deadlock in garbage collection when running processes in parallel

  start scan threads while the world isn't suspended

https://github.com/dlang/druntime/pull/2816

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https://issues.dlang.org/show_bug.cgi?id=20270

--- Comment #7 from Rainer Schuetze <r.sagitario@gmx.de> ---
I have reproduced the issue when running the test for a higher number of times. Not sure why this doesn't appear more often. Please try https://github.com/dlang/druntime/pull/2816

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https://issues.dlang.org/show_bug.cgi?id=20270

Rainer Schuetze <r.sagitario@gmx.de> changed:

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

--- Comment #8 from Rainer Schuetze <r.sagitario@gmx.de> ---
Not sure why this wasn't closed by the bot when https://github.com/dlang/druntime/pull/2816 got merged.

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