Re: time64 / Large File Support: 1) [2.28 Regression]: New getdents{64} implementation breaks qemu-user

[Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>]

Hi,

I did see your pings on IRC and I recall I rebased my tree against master after
it [1].  It is against master, so it should apply to 2.37.

And the main issue I did not get much replies on last iteration, I will send a
new version so we can track it for 2.38 (and maybe backport since it does not
interfere with ABI).

[1] https://sourceware.org/git/?p=glibc.git;a=shortlog;h=refs/heads/azanella/bz23960-dirent

On 25/01/23 20:58, Andreas K. Huettel via Libc-alpha wrote:
>> 1) qemu usermode emulation is broken when emulating a 32bit arch from a 64bit
>>    arch, bug 23960
> 
> This is bug 23960 [2] on the sourceware bugzilla. As you can see it's been around
> for a bit, and breaks emulating a 32bit architecture on a 64bit architecture.
> 
> Fear not, there is a fix, a patchset by Adhemerval Zanella [3]. It's been part of
> Gentoo's glibc for several years now, solves the problem fully, and has
> not led to any problems. 
> (We are in Gentoo Release Engineering heavy qemu usermode emulation users, building
> for riscv, mips, loongarch64, m68k, alpha...)
> 
> Pre-2.37 the patchset stopped applying. To my best knowledge the 
> azanella/bz23960-dirent branch [4] provides an updated version. I tried to
> verify that with Adhemerval, however unfortunately he never replied to my
> pings on IRC, so that confirmation is still missing.
> 
> * Is that the current fix?
> * Can we please merge it?
> 
> [2] https://sourceware.org/bugzilla/show_bug.cgi?id=23960
> [3] https://gitweb.gentoo.org/fork/glibc.git/log/?h=gentoo/glibc-2.36-1
> [4] https://sourceware.org/git/?p=glibc.git;a=shortlog;h=refs/heads/azanella/bz23960-dirent
> 
> 
> Am Donnerstag, 26. Januar 2023, 00:57:31 CET schrieb Andreas K. Huettel:
>> Dear all, 
>>
>> now that the 2.37 release and with that another half year of delay is near, 
>> I'd like to remind everyone that we still need to find some decent solution
>> for the remaining problems associated with time64 and LFS as discussed
>> earlier [1].
>>
>> As far as I can see at the moment there are two things that need a solution.
>>
>> 1) qemu usermode emulation is broken when emulating a 32bit arch from a 64bit
>>    arch, bug 23960
>>  
>> 2) the transition to default time64 breaks legacy 32bit binaries in
>>    unpredictable ways
>>
>> I'm going to reply with two separate e-mails for these issues, and would be
>> very happy for your opinions and contributions on the respective threads.
>>
>> Cheers,
>> Andreas 
>> (Gentoo toolchain team)
>>
>> [1] https://sourceware.org/pipermail/libc-alpha/2022-November/143386.html
>>
>>
> 
>