From: bugzilla-daemon@bugzilla.kernel.org
To: linux-ext4@vger.kernel.org
Subject: [Bug 201631] WARNING: CPU: 11 PID: 29593 at fs/ext4/inode.c:3927 .ext4_set_page_dirty+0x70/0xb0
Date: Thu, 20 Dec 2018 07:49:03 +0000 [thread overview]
Message-ID: <bug-201631-13602-M8ddelnow1@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-201631-13602@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=201631
--- Comment #28 from Jan Kara (jack@suse.cz) ---
(In reply to Benjamin Herrenschmidt from comment #24)
> Out of curiosity, how does this work in the context of pages that are GUPed
> either by a driver or by KVM when using file backed guest memory ?
>
> GUP will not "see" the mkclean or attempt at making read only...
That's a good question :) Well behaved GUP users use mmu notifiers as Aneesh
wrote to "see" mkclean. Badly behaved GUP users (and there's quite a few of
them) don't and that can result in kernel crashes, data loss, or checksum
failures in storage stack. The latest discussion on this topic is here if
you're interested: https://lwn.net/Articles/774411/
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next prev parent reply other threads:[~2018-12-20 7:49 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-07 18:14 [Bug 201631] New: WARNING: CPU: 11 PID: 29593 at fs/ext4/inode.c:3927 .ext4_set_page_dirty+0x70/0xb0 bugzilla-daemon
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