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: Sun, 16 Dec 2018 20:47:42 +0000 [thread overview]
Message-ID: <bug-201631-13602-nAwS8MyKPL@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 #11 from Benjamin Herrenschmidt (benh@kernel.crashing.org) ---
Jan, I don't know for sure what problems triggers it here, but there definitely
is a HW bug on POWER9 with the "NestMMU" (the MMU that services coprocessors
and the nvlink), which can cause a dirty bit to be set on a read-only PTE if it
races with the PTE update & invalidation.
It was "assumed" this was ok. If not I don't know how to work around it.
However, at least in the above cases, I don't see how we would be setting dirty
if we don't have RW access permission. A PowerMac G5 uses the hash MMU, we set
dirty atomically with checking the PTE permission when hashing a PTE in.
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next prev parent reply other threads:[~2018-12-16 20:47 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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