linux-ext4 - [Bug 219166] occasional block layer hang when setting 'echo noop

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Message-ID: <bug-219166-13602-1TqAJ48EY1@https.bugzilla.kernel.org/>
Date: Thu, 05 Sep 2024 01:04:58 +0000
From: bugzilla-daemon@...nel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 219166] occasional block layer hang when setting 'echo noop >
 /sys/block/sda/queue/scheduler'

https://bugzilla.kernel.org/show_bug.cgi?id=219166

Lei Ming (tom.leiming@...il.com) changed:

           What    |Removed                     |Added
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                 CC|                            |tom.leiming@...il.com

--- Comment #11 from Lei Ming (tom.leiming@...il.com) ---

Hi Richard,

Can you collect the blk-mq debugfs log for this virtio-blk devices?

  (cd /sys/kernel/debug/block/vda && find . -type f -exec grep -aH . {} \;)

There is known io hang risk in case of MQ:

https://lore.kernel.org/linux-block/20240903081653.65613-1-songmuchun@bytedance.com/T/#m0212e28431d08e00a3de132ec40b2b907bb07177

If you or anyone can reproduce the issue, please test the above patches.

Thanks,

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