Precisation: patch seems to be in linus tree (for version 3.20) at least
since 10 Feb 2015:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/?qt=grepq
=xen-blkback%3A+safely+unmap+grants
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Bugs, which is
** Changed in: linux (Ubuntu)
Importance: Undecided = High
** Changed in: linux (Ubuntu)
Status: Incomplete = Triaged
** Tags added: kernel-da-key trusty
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** Tags added: patch
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https://bugs.launchpad.net/bugs/1438677
Title:
dom0 kernel panic - xen_blkbk_unmap+0x5c/0x2f0 [xen_blkback]
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NOTE: this patch is not yet merged to the stable tree, so needs some
testing
** Patch added: xen-blkback: safely unmap grants in case they are still in use
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1438677/+attachment/4361965/+files/c43cf3ea838541ea9f066f4f1aa7b197cba6276e.patch
