linux-kernel - Re: [PATCH V9 20/20] riscv: compat: Add COMPAT Kbuild skeletal support

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Date:   Wed, 25 May 2022 12:57:30 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Guo Ren <guoren@...nel.org>, Guenter Roeck <linux@...ck-us.net>
Cc:     Palmer Dabbelt <palmer@...belt.com>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christoph Hellwig <hch@....de>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-csky@...r.kernel.org,
        linux-s390 <linux-s390@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH V9 20/20] riscv: compat: Add COMPAT Kbuild skeletal support

Am Mittwoch, 25. Mai 2022, 00:06:46 CEST schrieb Guenter Roeck:
> On Wed, May 25, 2022 at 01:46:38AM +0800, Guo Ren wrote:
> [ ... ]
> 
> > > The problem is come from "__dls3's vdso decode part in musl's
> > > ldso/dynlink.c". The ehdr->e_phnum & ehdr->e_phentsize are wrong.
> > >
> > > I think the root cause is from musl's implementation with the wrong
> > > elf parser. I would fix that soon.
> > Not elf parser, it's "aux vector just past environ[]". I think I could
> > solve this, but anyone who could help dig in is welcome.
> > 
> 
> I am not sure I understand what you are saying here. Point is that my
> root file system, generated with musl a year or so ago, crashes with
> your patch set applied. That is a regression, even if there is a bug
> in musl.

Also as I said in the other part of the thread, the rootfs seems innocent,
as my completely-standard Debian riscv64 rootfs is also affected.

The merged version seems to be v12 [0] - not sure how we this discussion
ended up in v9, but I just tested this revision in two variants:

- v5.17 + this v9 -> works nicely
- v5.18-rc6 + this v9 (rebased onto it) -> breaks the boot
  The only rebase-conflict was with the introduction of restartable
  sequences and removal of the tracehook include, but turning CONFIG_RSEQ
  off doesn't seem to affect the breakage.

So it looks like something changed between 5.17 and 5.18 that causes the issue.


Heiko


[0] https://lore.kernel.org/all/20220405071314.3225832-1-guoren@kernel.org/