Messages in this thread | | | Date | Sun, 29 Jul 2018 11:41:31 +0200 | From | Tomas Janousek <> | Subject | Re: [PATCH] block: fix NPE when resuming SCSI devices using blk-mq |
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Hi,
On Fri, Jul 13, 2018 at 09:41:41PM +0800, Ming Lei wrote: > Now runtime PM is disabled for blk-mq/scsi_mq, not sure how this issue is > triggered on your machine.
While Patrick did miss the following patch:
* 765e40b675a9 ("block: disable runtime-pm for blk-mq"; July 2017).
there is at least one other way to trigger it -- enable laptop-mode-tools or tlp which enable runtime-pm for all devices.
The "disable runtime-pm for blk-mq" only disables it _by_default_, but doesn't prevent it from being enabled again from user-space, which it is unless one manually blacklists sd devices from runtime-pm enablement. It's bitten a few people already: https://github.com/rickysarraf/laptop-mode-tools/issues/123
(I found this thread because I'm also getting the NULL pointer dereference at 00000000000001a8 on resume from suspend.)
-- Tomáš Janoušek, a.k.a. Pivník, a.k.a. Liskni_si, http://work.lisk.in/
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