126 lines
4.6 KiB
Diff
126 lines
4.6 KiB
Diff
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From davej Wed Jun 20 11:37:32 2012
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Return-Path: oleg@redhat.com
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for <davej@localhost> (single-drop); Wed, 20 Jun 2012 11:37:32 -0400 (EDT)
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for <davej@mail.corp.redhat.com>; Wed, 20 Jun 2012 11:37:18 -0400 (EDT)
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oleg@redhat.com; Wed, 20 Jun 2012 17:35:20 +0200 (CEST)
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Date: Wed, 20 Jun 2012 17:35:19 +0200
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From: Oleg Nesterov <oleg@redhat.com>
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To: Dave Jones <davej@redhat.com>
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Cc: Fedora Kernel Team <kernel-team@fedoraproject.org>
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Subject: Re: [Bug 832867] BUG: Bad rss-counter state mm:xxxxxxxx idx:1
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val:-2 output in console
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Message-ID: <20120620153519.GA17642@redhat.com>
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References: <bug-832867-176318@bugzilla.redhat.com> <bug-832867-176318-mTgNUmpuHi@bugzilla.redhat.com> <20120619172633.GG26103@redhat.com>
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Content-Type: text/plain; charset=us-ascii
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In-Reply-To: <20120619172633.GG26103@redhat.com>
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User-Agent: Mutt/1.5.18 (2008-05-17)
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X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22
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Status: RO
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Content-Length: 2687
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Lines: 84
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Hi Dave,
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sorry for delay
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On 06/19, Dave Jones wrote:
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>
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> > https://bugzilla.redhat.com/show_bug.cgi?id=832867
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> >
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> > --- Comment #11 from Bojan Smojver <bojan@rexursive.com> ---
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> > Patches for this:
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> >
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> > http://comments.gmane.org/gmane.linux.kernel/1306252
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>
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> Oleg,
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>
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> are these patches final ? Are they headed for stable ?
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No. And 1/2 was wrong actually, see
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http://marc.info/?l=linux-kernel&m=133911852215275
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Konstantin sent the minimal fix,
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mm-correctly-synchronize-rss-counters-at-exit-exec.patch in -mm tree,
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attached below.
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Oleg.
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------------------------------------------------------
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From: Konstantin Khlebnikov <khlebnikov@openvz.org>
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Subject: mm: correctly synchronize rss-counters at exit/exec
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do_exit() and exec_mmap() call sync_mm_rss() before mm_release() does
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put_user(clear_child_tid) which can update task->rss_stat and thus make
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mm->rss_stat inconsistent. This triggers the "BUG:" printk in check_mm().
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Let's fix this bug in the safest way, and optimize/cleanup this later.
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Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
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Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
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Cc: Oleg Nesterov <oleg@redhat.com>
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Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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Cc: Hugh Dickins <hughd@google.com>
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Cc: <stable@vger.kernel.org>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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---
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fs/exec.c | 2 +-
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kernel/exit.c | 1 +
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2 files changed, 2 insertions(+), 1 deletion(-)
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diff -puN fs/exec.c~mm-correctly-synchronize-rss-counters-at-exit-exec fs/exec.c
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--- a/fs/exec.c~mm-correctly-synchronize-rss-counters-at-exit-exec
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+++ a/fs/exec.c
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@@ -819,10 +819,10 @@ static int exec_mmap(struct mm_struct *m
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/* Notify parent that we're no longer interested in the old VM */
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tsk = current;
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old_mm = current->mm;
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- sync_mm_rss(old_mm);
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mm_release(tsk, old_mm);
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if (old_mm) {
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+ sync_mm_rss(old_mm);
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/*
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* Make sure that if there is a core dump in progress
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* for the old mm, we get out and die instead of going
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diff -puN kernel/exit.c~mm-correctly-synchronize-rss-counters-at-exit-exec kernel/exit.c
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--- a/kernel/exit.c~mm-correctly-synchronize-rss-counters-at-exit-exec
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+++ a/kernel/exit.c
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@@ -643,6 +643,7 @@ static void exit_mm(struct task_struct *
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mm_release(tsk, mm);
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if (!mm)
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return;
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+ sync_mm_rss(mm);
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/*
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* Serialize with any possible pending coredump.
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* We must hold mmap_sem around checking core_state
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_
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Subject: From: Konstantin Khlebnikov <khlebnikov@openvz.org>
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Patches currently in -mm which might be from khlebnikov@openvz.org are
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linux-next.patch
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memcg-fix-use_hierarchy-css_is_ancestor-oops-regression.patch
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mm-correctly-synchronize-rss-counters-at-exit-exec.patch
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