commit fd9c40f64c514bdc585a21e2e33fa5f83ca8811b
Author: Bart Van Assche <[email protected]>
Date: Thu Apr 4 10:08:43 2019 -0700
block: Revert v5.0 blk_mq_request_issue_directly() changes
blk_mq_try_issue_directly() can return BLK_STS*_RESOURCE for requests that
have been queued. If that happens when blk_mq_try_issue_directly() is called
by the dm-mpath driver then dm-mpath will try to resubmit a request that is
already queued and a kernel crash follows. Since it is nontrivial to fix
blk_mq_request_issue_directly(), revert the blk_mq_request_issue_directly()
changes that went into kernel v5.0.
This patch reverts the following commits:
* d6a51a97c0b2 ("blk-mq: replace and kill blk_mq_request_issue_directly") #
v5.0.
* 5b7a6f128aad ("blk-mq: issue directly with bypass 'false' in
blk_mq_sched_insert_requests") # v5.0.
* 7f556a44e61d ("blk-mq: refactor the code of issue request directly") #
v5.0.
Cc: Christoph Hellwig <[email protected]>
Cc: Ming Lei <[email protected]>
Cc: Jianchao Wang <[email protected]>
Cc: Hannes Reinecke <[email protected]>
Cc: Johannes Thumshirn <[email protected]>
Cc: James Smart <[email protected]>
Cc: Dongli Zhang <[email protected]>
Cc: Laurence Oberman <[email protected]>
Cc: <[email protected]>
Reported-by: Laurence Oberman <[email protected]>
Tested-by: Laurence Oberman <[email protected]>
Fixes: 7f556a44e61d ("blk-mq: refactor the code of issue request directly")
# v5.0.
Signed-off-by: Bart Van Assche <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Patch exists in mainline from April 7 (patch landed April 4 but wasn't
pulled into Mainline until April 7) so it's not currently in Disco or
Eoan.
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https://bugs.launchpad.net/bugs/1827330
Title:
[block layer] please pull below upstream patch to Ubuntu 19.04 kernel
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