The patch titled From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> has been added to the -mm tree. Its filename is mm-correctly-synchronize-rss-counters-at-exit-exec.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> Subject: mm: correctly synchronize rss-counters at exit/exec 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@xxxxxxxxxxxxxxx> Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> Cc: Oleg Nesterov <oleg@xxxxxxxxxx> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/exec.c | 2 +- kernel/exit.c | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff -puN fs/exec.c~mm-correctly-synchronize-rss-counters-at-exit-exec fs/exec.c --- a/fs/exec.c~mm-correctly-synchronize-rss-counters-at-exit-exec +++ a/fs/exec.c @@ -819,10 +819,10 @@ static int exec_mmap(struct mm_struct *m /* Notify parent that we're no longer interested in the old VM */ tsk = current; old_mm = current->mm; - sync_mm_rss(old_mm); mm_release(tsk, old_mm); if (old_mm) { + sync_mm_rss(old_mm); /* * Make sure that if there is a core dump in progress * for the old mm, we get out and die instead of going diff -puN kernel/exit.c~mm-correctly-synchronize-rss-counters-at-exit-exec kernel/exit.c --- a/kernel/exit.c~mm-correctly-synchronize-rss-counters-at-exit-exec +++ a/kernel/exit.c @@ -643,6 +643,7 @@ static void exit_mm(struct task_struct * mm_release(tsk, mm); if (!mm) return; + sync_mm_rss(mm); /* * Serialize with any possible pending coredump. * We must hold mmap_sem around checking core_state _ Subject: From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> Patches currently in -mm which might be from khlebnikov@xxxxxxxxxx are linux-next.patch memcg-fix-use_hierarchy-css_is_ancestor-oops-regression.patch mm-correctly-synchronize-rss-counters-at-exit-exec.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html