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Message-ID: <Z8xUkKrCETzQjcBi@pie>
Date: Sat, 8 Mar 2025 14:30:40 +0000
From: Yao Zi <ziyao@...root.org>
To: musl@...ts.openwall.com
Subject: Re: Calling pthread_getattr_np won't return in the mremap
loop when using musl in FreeBSD's Linux compatibility layer
On Sat, Mar 08, 2025 at 02:18:04PM +0000, Mouri Kenji wrote:
> Hello all,
>
> When I tried to use musl-based userspace in FreeBSD's Linux
> compatibility layer, I found some app will hung.
>
> I do some debugging with lldb. I have found app hang in mremap loop
> in the musl's pthread_getattr_np implementation.
>
> I read the FreeBSD's Linux compatibility layer source code, it seems
> mremap in FreeBSD's Linux compatibility layer in won't support expand the size.
>
> Here is the source code for FreeBSD's Linux compatibility layer mremap
> implementation: https://github.com/freebsd/freebsd-src/blob/780a4667bbde0daa90db900bb0f93f6337d6208b/sys/compat/linux/linux_misc.c#L302
>
> I only can send a report e-mail to this mail list instead of making a
> patch because I'm the newbie of Linux's libc internals, and I feel
> sorry for that.
imho the report and the patch should all go into the FreeBSD's mailing
list or similar things. Honestly, why should musl workaround for a
non-officially-supported platform?
> I have already talked that in musl's IRC but I think I should send a
> mail to mail list as archive. I know "Some already implemented
> syscalls are also suboptimal, for example mremap and others." in
> https://docs.freebsd.org/en/articles/linux-emulation/#future-work, but
> I hope musl will have the workaround for that. And it can make people
> can use musl happily in FreeBSD's linuxemu.
>
> Kenji Mouri (https://github.com/MouriNaruto)
>
Best regards,
Yao Zi
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