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From: Doug Nazar <nazard@nazar.ca>
To: linux-kernel@vger.kernel.org
Cc: Wei Fang <fangwei1@huawei.com>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Kernels v4.9+ cause short reads of block devices
Date: Wed, 23 Aug 2017 15:15:15 -0400	[thread overview]
Message-ID: <1ae53e17-e455-4f17-0280-b0dae183a449@nazar.ca> (raw)

The following commits cause short reads of block devices, however writes 
are still allowed.

c2a9737f45e2 ("vfs,mm: fix a dead loop in truncate_inode_pages_range()")
d05c5f7ba164 ("vfs,mm: fix return value of read() at s_maxbytes")

When e2fsck sees this, it thinks it's a bad sector and tries to write a 
block of nulls which overwrites the valid data.

Device is LVM over 2 x RAID-5 on an old 32bit desktop.

RO    RA   SSZ   BSZ   StartSec            Size   Device
rw  4096   512  4096          0   9748044840960 /dev/Storage/Main

Doug

             reply	other threads:[~2017-08-23 19:54 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-23 19:15 Doug Nazar [this message]
2017-08-23 19:37 ` Kernels v4.9+ cause short reads of block devices Linus Torvalds
2017-08-23 19:53   ` Doug Nazar
2017-08-23 20:13     ` Linus Torvalds
2017-08-23 21:01       ` Andreas Dilger
2017-08-24 10:20         ` Doug Nazar
2017-08-24 15:22           ` Dave Kleikamp
2017-08-24 15:22             ` Dave Kleikamp
2017-08-27 19:47         ` Linus Torvalds
2017-08-27 19:54           ` Dave Kleikamp
2017-08-29 10:40           ` Doug Nazar
2017-08-24 10:03       ` Doug Nazar

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