RFR: 8225035: Thread stack size issue caused by large TLS size

[Florian Weimer]

* Jiangli Zhou:

> Just want to make sure that I understand the above correctly. Do you
> suggest not to address the insufficient stack space issue caused by
> the on-stack TLS allocations in Java layer with the workaround in
> OpenJDK? If that's the case, any user who does face the issue would
> have no available solution (maybe advanced users could build their own
> patched JVM, but certainly not feasible for all users).

It should be possible to LD_PRELOAD shared objects with large static TLS
areas, so that the dynamic linker takes their requirements into account
at process start.  So that could still be a workaround.

I think I suggested before to have a JVM knob which specifies a minimum
stack size for passing to libpthread.  This would be a rather
straightforward way to deal with applications which specify impossibly
small thread stacks without having to recompile them.  If users
encounter a problem and they are on 64-bit architectures, they can just
set that knob to 1 MiB because it's unlikely that they have to conserve
address space.

Thanks,
Florian