From: Rolf Eike Beer <eike-kernel@sf-tec.de>
To: linux-parisc@vger.kernel.org
Subject: Re: [PATCH] parisc: Fix gcc miscompilation in pa_memcpy()
Date: Fri, 05 Jul 2013 23:05:02 +0200 [thread overview]
Message-ID: <12486210.aWq2PzHOxI@eto> (raw)
In-Reply-To: <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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next prev parent reply other threads:[~2013-07-05 21:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-04 20:34 [PATCH] parisc: Fix gcc miscompilation in pa_memcpy() Helge Deller
2013-07-05 21:05 ` Rolf Eike Beer [this message]
2013-07-05 21:44 ` John David Anglin
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