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Re: [Qemu-devel] [PATCH 4/4] ahci-test: improve rw buffer patterns

From: John Snow
Subject: Re: [Qemu-devel] [PATCH 4/4] ahci-test: improve rw buffer patterns
Date: Tue, 31 Mar 2015 16:58:49 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 03/31/2015 04:55 PM, Ed Maste wrote:
On 23 March 2015 at 12:56, John Snow <address@hidden> wrote:
My pattern was cyclical every 256 bytes, so it missed a fairly obvious
failure case. Add some rand() pepper into the test pattern, and for large
patterns that exceed 256 sectors, start writing an ID per-sector so that
we never generate identical sector patterns.

Signed-off-by: John Snow <address@hidden>
Reviewed-by: Stefan Hajnoczi <address@hidden>
Tested-by: Andreas Färber <address@hidden>
Message-id: address@hidden
  tests/ahci-test.c | 36 ++++++++++++++++++++++++++++--------
  1 file changed, 28 insertions(+), 8 deletions(-)

As of the introduction of this test the test suite fails on FreeBSD,
with 6 errors of the form:

ERROR:tests/ahci-test.c:790:ahci_test_io_rw_simple: assertion failed
(memcmp(tx, rx, bufsize) == 0): (0xffffffffffffffff == 0x00000000)
GTester: last random seed: R02S76f68c4cfb2d54af66de227ed44fd54a

I haven't yet done any investigation beyond bisecting.

which test case does it fail under? io_rw_simple is shared by a number of different tests.

I suspect deeply that this test pattern has just unearthed an existing problem.

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