linux-kernel - BUG_ON() hit in drivers/md/raid5.c

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Message-Id: <BFD51561-092F-4791-A42E-72F1373AEB50@canonical.com>
Date:   Wed, 19 Dec 2018 16:46:31 +0800
From:   Kai Heng Feng <kai.heng.feng@...onical.com>
To:     dan.j.williams@...el.com
Cc:     Steve Kowalik <steven@...ontsleep.org>, linux-raid@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>
Subject: BUG_ON() hit in drivers/md/raid5.c

Hi Dan,

There are two different BUG_ON() incidents get recently reported on Launchpad [1].

The first one is BUG_ON(dev->written) in ops_run_biodrain().
The second one (comment #23) is BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)) in handle_parity_checks5().

I am not familiar with raid 5 so I am not sure these BUG_ON() are expected to be hit.

[1] https://bugs.launchpad.net/bugs/1780628

Kai-Heng