[Issue 20497] New: thread with limited stackspace crashes depending on size of TLS

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20497

          Issue ID: 20497
           Summary: thread with limited stackspace crashes depending on
                    size of TLS
           Product: D
           Version: D2
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: critical
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: r.sagitario at gmx.de

import core.thread;
import core.stdc.stdio;

ubyte[9000] data;

void task()
{
        ubyte[1024] useStack;
        printf("%p\n", useStack.ptr);
}

void main()
{
        auto th = new Thread(&task, 16384);
        th.start();
        th.join();
}


Running this code on Ubuntu 19 crashes with a segmentation fault. If the size
of data[] is reduced to 8000, the program runs as expected. With size of data[]
of 16kB, you get the error

core.thread.osthread.ThreadError at src/core/thread/osthread.d(3184): Error
creating thread

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