From: Andi Kleen <andi@firstfloor.org>
To: linux-kernel@vger.kernel.org
Subject: 2.6.33 pagemap endless read loop
Date: Sun, 10 Jan 2010 03:09:55 +0100 [thread overview]
Message-ID: <20100110020955.GB25323@basil.fritz.box> (raw)
An LTP run on x86-64/2.6.33-rc3 run right now results in "proc01" hanging
lr-x------ 1 root root 64 2010-01-10 02:28 7 -> /proc/2679/task/2679/pagemap
strace shows an endless loop of
read(7, "\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0"..., 1024) = 1024
read(7, "\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0"..., 1024) = 1024
read(7, "\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0"..., 1024) = 1024
read(7, "\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0"..., 1024) = 1024
read(7, "\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0"..., 1024) = 1024
read(7, "\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0"..., 1024) = 1024
read(7, "\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0\0\0\0\0\6\0\0\0"..., 1024) = 10
cat of that file hangs in the same way so it seems like a kernel bug.
A cat of /proc/2679/pagemap also hangs, in fact any pagemap cat seems to.
I tried to revert the latest change from Horiguchi-san:
commit 5dc37642cbce34619e4588a9f0bdad1d2f870956
Author: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Date: Mon Dec 14 18:00:01 2009 -0800
mm hugetlb: add hugepage support to pagemap
but that didn't fix it, so it must be something else.
Haven't done further bisect or anything, should be easy to reproduce.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next reply other threads:[~2010-01-10 2:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-10 2:09 Andi Kleen [this message]
2010-01-10 6:33 ` Américo Wang
2010-01-10 12:37 ` Andi Kleen
2010-01-12 5:59 ` Mike Galbraith
2010-01-12 15:32 ` Américo Wang
2010-01-12 16:28 ` Andi Kleen
2010-01-13 2:08 ` Américo Wang
[not found] ` <20100113141648.42eff724.akpm@linux-foundation.org>
[not found] ` <1263421562.29868.5000.camel@calx>
[not found] ` <20100113143055.7bea30c5.akpm@linux-foundation.org>
[not found] ` <1263423916.29868.5009.camel@calx>
[not found] ` <20100113151502.fa425247.akpm@linux-foundation.org>
[not found] ` <20100114055319.GA17671@localhost>
[not found] ` <20100113221013.b1beecb4.akpm@linux-foundation.org>
2010-01-14 8:06 ` Wu Fengguang
2010-01-14 8:30 ` Andi Kleen
2010-01-14 8:52 ` [PATCH] pagemap: early return on unmapped areas Wu Fengguang
2010-01-14 17:02 ` Matt Mackall
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