https://github.com/torvalds/linux
Revision 4fe7efdbdfb1c7e7a7f31decfd831c0f31d37091 authored by Konstantin Khlebnikov on 20 June 2012, 19:53:01 UTC, committed by Linus Torvalds on 20 June 2012, 21:39:36 UTC
do_exit() and exec_mmap() call sync_mm_rss() before mm_release() does
put_user(clear_child_tid) which can update task->rss_stat and thus make
mm->rss_stat inconsistent.  This triggers the "BUG:" printk in check_mm().

Let's fix this bug in the safest way, and optimize/cleanup this later.

Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent e0897d7
History
Tip revision: 4fe7efdbdfb1c7e7a7f31decfd831c0f31d37091 authored by Konstantin Khlebnikov on 20 June 2012, 19:53:01 UTC
mm: correctly synchronize rss-counters at exit/exec
Tip revision: 4fe7efd
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.gitignore -rw-r--r-- 1014 bytes
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