From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rolf Eike Beer <eike-kernel@sf-tec.de>
Subject: Re: [PATCH] parisc: Fix gcc miscompilation in pa_memcpy()
Date: Fri, 05 Jul 2013 23:05:02 +0200
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References: <20130704203411.GA1258@p100.box>
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Am Donnerstag 04 Juli 2013, 22:34:11 schrieb Helge Deller:
> When running the LTP testsuite one may hit this kernel BUG() with the
> write06 testcase:
> 
> kernel BUG at mm/filemap.c:2023!
> CPU: 1 PID: 8614 Comm: writev01 Not tainted 3.10.0-rc7-64bit-c3000+ #6
> IASQ: 0000000000000000 0000000000000000 IAOQ: 00000000401e6e84
> 00000000401e6e88 IIR: 03ffe01f    ISR: 0000000010340000  IOR:
> 000001fbe0380820
>  CPU:        1   CR30: 00000000bef80000 CR31: ffffffffffffffff
>  ORIG_R28: 00000000bdc192c0
>  IAOQ[0]: iov_iter_advance+0x3c/0xc0
>  IAOQ[1]: iov_iter_advance+0x40/0xc0
>  RP(r2): generic_file_buffered_write+0x204/0x3f0
> Backtrace:
>  [<00000000401e764c>] generic_file_buffered_write+0x204/0x3f0
>  [<00000000401eab24>] __generic_file_aio_write+0x244/0x448
>  [<00000000401eadc0>] generic_file_aio_write+0x98/0x150
>  [<000000004024f460>] do_sync_readv_writev+0xc0/0x130
>  [<000000004025037c>] compat_do_readv_writev+0x12c/0x340
>  [<00000000402505f8>] compat_writev+0x68/0xa0
>  [<0000000040251d88>] compat_SyS_writev+0x98/0xf8
> 
> Reason for this crash is a gcc miscompilation in the fault handlers of
> pa_memcpy() which return the fault address instead of the copied bytes.
> Since this seems to be a generic problem with gcc-4.7.x (and below), it's
> better to simplify the fault handlers in pa_memcpy to avoid this problem.

Which gcc PR# is that?

Greetings,

Eike
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