linux-kernel - Re: strace-4.18 test suite oopses sparc64 4.12 and 4.13-rc kernels

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Date:   Fri, 4 Aug 2017 10:02:25 +0200
From:   Mikael Pettersson <mikpelinux@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     mikpelinux@...il.com, sam@...nborg.org, matorola@...il.com,
        sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: strace-4.18 test suite oopses sparc64 4.12 and 4.13-rc kernels

David Miller writes:
 > From: Mikael Pettersson <mikpelinux@...il.com>
 > Date: Thu, 3 Aug 2017 22:02:57 +0200
 > 
 > > With that in place the kernel booted fine.
 > > When I then ran the `poll' strace test binary, the OOPS was replaced by:
 > > 
 > > [  140.589913] _copy_from_user(fff000123c8dfa7c,           (null), 240) res 240
 > > [  140.753162] _copy_from_user(fff000123c8dfa7c, 00000000f7e4a000, 8) res 8
 > > [  140.824155] _copy_from_user(fff000123c8dfa7c, 00000000f7e49ff8, 16) res 18442240552407530112
 > > 
 > > That last `res' doesn't look good.
 > 
 > Please test this patch:
 > 
 > diff --git a/arch/sparc/lib/U3memcpy.S b/arch/sparc/lib/U3memcpy.S
 > index 54f9870..5a8cb37 100644
 > --- a/arch/sparc/lib/U3memcpy.S
 > +++ b/arch/sparc/lib/U3memcpy.S
 > @@ -145,13 +145,13 @@ ENDPROC(U3_retl_o2_plus_GS_plus_0x08)
 >  ENTRY(U3_retl_o2_and_7_plus_GS)
 >  	and	%o2, 7, %o2
 >  	retl
 > -	 add	%o2, GLOBAL_SPARE, %o2
 > +	 add	%o2, GLOBAL_SPARE, %o0
 >  ENDPROC(U3_retl_o2_and_7_plus_GS)
 >  ENTRY(U3_retl_o2_and_7_plus_GS_plus_8)
 >  	add	GLOBAL_SPARE, 8, GLOBAL_SPARE
 >  	and	%o2, 7, %o2
 >  	retl
 > -	 add	%o2, GLOBAL_SPARE, %o2
 > +	 add	%o2, GLOBAL_SPARE, %o0
 >  ENDPROC(U3_retl_o2_and_7_plus_GS_plus_8)
 >  #endif
 >  

Backing out my debugging patch and adding this one instead
gave me a working kernel that doesn't OOPS.  Thanks.

Tested-by: Mikael Pettersson <mikpelinux@...il.com>