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Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to commit 3448890c32c3

From Al Viro <viro@ZenIV.linux.org.uk>
Newsgroups linux.kernel
Subject Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to commit 3448890c32c3
Date 2017-06-25 13:20 +0200
Message-ID <tWdKa-4oh-9@gated-at.bofh.it> (permalink)
References (5 earlier) <tVfXH-uK-17@gated-at.bofh.it> <tVBOy-5Jh-15@gated-at.bofh.it> <tVDx0-6Sb-21@gated-at.bofh.it> <tVX2F-2dc-1@gated-at.bofh.it> <tWcuJ-3q1-7@gated-at.bofh.it>
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On Sun, Jun 25, 2017 at 10:53:58AM +0100, Al Viro wrote:
> On Sat, Jun 24, 2017 at 12:29:23PM -0500, Larry Finger wrote:
> 
> > I made a break through. If I turn off inline copy to/from users for 32-bit
> > ppc with the following patch, then the system boots:
> 
> OK...  So it's 4.6.3 miscompiling something - it is hardware-independent,
> reproduced in qemu.  I'd like to get more self-contained example of
> miscompile, though; should be done by tonight...

OK, it's the call in rw_copy_check_uvector(); with INLINE_COPY_FROM_USER
it's miscompiled by 4.6.3.  I hadn't looked through the generated code
yet; will do that after I grab some sleep.

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Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to commit  3448890c32c3 Larry Finger <Larry.Finger@lwfinger.net> - 2017-06-21 17:20 +0200
  Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to  commit 3448890c32c3 Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-21 23:30 +0200
    Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to  commit 3448890c32c3 Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-21 23:40 +0200
      Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to commit  3448890c32c3 Larry Finger <Larry.Finger@lwfinger.net> - 2017-06-21 23:50 +0200
        Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to  commit 3448890c32c3 Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-22 16:20 +0200
          Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to commit  3448890c32c3 Larry Finger <Larry.Finger@lwfinger.net> - 2017-06-22 16:30 +0200
            Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to  commit 3448890c32c3 Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-22 21:30 +0200
              Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to  commit 3448890c32c3 Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-22 23:50 +0200
              Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to commit  3448890c32c3 Larry Finger <Larry.Finger@lwfinger.net> - 2017-06-23 20:50 +0200
                Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to  commit 3448890c32c3 Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-23 22:40 +0200
                Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to commit  3448890c32c3 Larry Finger <Larry.Finger@lwfinger.net> - 2017-06-24 19:30 +0200
                Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to  commit 3448890c32c3 Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-25 12:00 +0200
                Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to  commit 3448890c32c3 Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-25 13:20 +0200
                gcc 4.6.3 miscompile on ppc32 (was Re: Regression in kernel 4.12-rc1  for Powerpc 32 - bisected to commit 3448890c32c3) Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-25 23:00 +0200
                Re: gcc 4.6.3 miscompile on ppc32 (was Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to commit 3448890c32c3) Segher Boessenkool <segher@kernel.crashing.org> - 2017-06-25 23:50 +0200
                Re: gcc 4.6.3 miscompile on ppc32 (was Re: Regression in kernel  4.12-rc1 for Powerpc 32 - bisected to commit 3448890c32c3) Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-26 00:30 +0200
                Re: gcc 4.6.3 miscompile on ppc32 (was Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to commit 3448890c32c3) Michael Ellerman <mpe@ellerman.id.au> - 2017-06-26 15:40 +0200
                Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to commit 3448890c32c3 Michael Ellerman <mpe@ellerman.id.au> - 2017-06-26 15:50 +0200

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