linux-kernel - Sporadic regmap unit test failure in raw

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Date: Thu, 8 Feb 2024 13:45:13 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Mark Brown <broonie@...nel.org>
Cc: linux-kernel@...r.kernel.org
Subject: Sporadic regmap unit test failure in raw_sync

Hi Mark,

I have seen the following error with the regmap unit tests:

        KTAP version 1
        # Subtest: raw_sync
        ok 1 flat-little
        ok 2 flat-big
        ok 3 rbtree-little
    # raw_sync: EXPECTATION FAILED at drivers/base/regmap/regmap-kunit.c:1305
    Expected &hw_buf[6] != val, but
        &hw_buf[6] ==
         57  30 
        val ==
         57  30 
        not ok 4 rbtree-big
        ok 5 maple-little
        ok 6 maple-big
    # raw_sync: pass:5 fail:1 skip:0 total:6
    not ok 25 raw_sync

This is with regmap: 'kunit: fix raw noinc write test wrapping'
applied on top of the upstream kernel (v6.8-rc3-47-g047371968ffc).
So far I have seen it only once, with the x86_64:q35 emulation in qemu.

Guenter