linux-kernel - Re: [PATCH] riscv: Partially revert "Remove stat64 family from default syscall set"

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Date:   Thu, 7 Feb 2019 15:12:02 -0800
From:   Alistair Francis <alistair23@...il.com>
To:     David Abdurachmanov <david.abdurachmanov@...il.com>,
        zongbox@...il.com
Cc:     Alistair Francis <Alistair.Francis@....com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "palmer@...ive.com" <palmer@...ive.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] riscv: Partially revert "Remove stat64 family from
 default syscall set"

On Thu, Feb 7, 2019 at 3:04 PM David Abdurachmanov
<david.abdurachmanov@...il.com> wrote:
>
> On Thu, Feb 7, 2019 at 11:56 PM Alistair Francis
> <Alistair.Francis@....com> wrote:
> >
> > To fix systemd/sysVinit crashes enable __ARCH_WANT_STAT64.
> >
> > systemd failed to start with this error for 32-bit RISC-V:
> > [    2.833864] Run /sbin/init as init process
> > /sbin/init: error while loading shared libraries: libsystemd-shared-239.so: cannot stat shared object: Error 38
> > [    2.933593] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00007f00
> > [    2.934120] CPU: 0 PID: 1 Comm: init Not tainted 5.0.0-rc4-yoctodev-standard #1
> > [    2.934589] Call Trace:
> > [    2.934919] [<c0048a30>] walk_stackframe+0x0/0xa0
> > [    2.935243] [<c0048c14>] show_stack+0x28/0x32
> > [    2.935518] [<c05fa418>] dump_stack+0x68/0x88
> > [    2.935788] [<c004de48>] panic+0xf0/0x252
> > [    2.936041] [<c0051780>] do_exit+0x7de/0x7fc
> > [    2.936387] [<c00517f4>] do_group_exit+0x2a/0x82
> > [    2.936674] [<c005185e>] __wake_up_parent+0x0/0x22
> > [    2.936982] [<c00475fa>] ret_from_syscall+0x0/0xe
> > [    2.937673] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00007f00 ]---
> >
> > sysVinit had a similar problem as well. By enabling __ARCH_WANT_STAT64
> > for 32-bit RISC-V the problem disapears and 32-bit RISC-V is able to
> > boot.
>
> Hi,
>
> This is expected change for riscv32. More details here:
> http://lists.infradead.org/pipermail/linux-riscv/2018-November/002062.html

Thanks for the explanation.

+ Zong

Do you know what the statx implementation is in the 32-bit RISC-V
glibc submission?

Alistair

>
> david
>
> >
> > Signed-off-by: Alistair Francis <alistair.francis@....com>
> > ---
> > This was tested with this fork of glibc to enable 32-bit RISC-V support:
> > https://github.com/riscv/riscv-glibc/tree/riscv-glibc-2.29
> > commit: 04fdd476160a55792a75375ba2bf56c761f811c2
> >
> > I'm not sure if this is a glibc problem or a kernel problem, but this
> > commit caused the breakage between the 4.19 and 4.20 kernel so I'm
> > sending out a patch. Let me know your thoughts
> >
> > arch/riscv/include/uapi/asm/unistd.h | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/arch/riscv/include/uapi/asm/unistd.h b/arch/riscv/include/uapi/asm/unistd.h
> > index 1f3bd3ebbb0d..031b7d78e11c 100644
> > --- a/arch/riscv/include/uapi/asm/unistd.h
> > +++ b/arch/riscv/include/uapi/asm/unistd.h
> > @@ -20,6 +20,9 @@
> >  #endif /* __LP64__ */
> >
> >  #include <asm-generic/unistd.h>
> > +#if __BITS_PER_LONG == 32
> > +#define __ARCH_WANT_STAT64
> > +#endif
> >
> >  /*
> >   * Allows the instruction cache to be flushed from userspace.  Despite RISC-V
> > --
> > 2.20.1
> >
> >
> > _______________________________________________
> > linux-riscv mailing list
> > linux-riscv@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-riscv

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