The patch titled
OOM can panic due to processes stuck in __alloc_pages()
has been added to the -mm tree. Its filename is
oom-can-panic-due-to-processes-stuck-in-__alloc_pages.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: OOM can panic due to processes stuck in __alloc_pages()
From: Kirill Korotaev <dev@xxxxxxxxxx>
OOM can panic due to the processes stuck in __alloc_pages() doing infinite
rebalance loop while no memory can be reclaimed. OOM killer tries to kill
some processes, but unfortunetaly, rebalance label was moved by someone
below the TIF_MEMDIE check, so buddy allocator doesn't see that process is
OOM-killed and it can simply fail the allocation :/
Observed in reality on RHEL4(2.6.9)+OpenVZ kernel when a user doing some
memory allocation tricks triggered OOM panic.
Signed-off-by: Denis Lunev <den@xxxxx>
Signed-off-by: Kirill Korotaev <dev@xxxxxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/page_alloc.c | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/page_alloc.c~oom-can-panic-due-to-processes-stuck-in-__alloc_pages mm/page_alloc.c
--- a/mm/page_alloc.c~oom-can-panic-due-to-processes-stuck-in-__alloc_pages
+++ a/mm/page_alloc.c
@@ -1184,6 +1184,7 @@ restart:
/* This allocation should allow future memory freeing. */
+rebalance:
if (((p->flags & PF_MEMALLOC) || unlikely(test_thread_flag(TIF_MEMDIE)))
&& !in_interrupt()) {
if (!(gfp_mask & __GFP_NOMEMALLOC)) {
@@ -1205,7 +1206,6 @@ nofail_alloc:
if (!wait)
goto nopage;
-rebalance:
cond_resched();
/* We now go into synchronous reclaim */
_
Patches currently in -mm which might be from dev@xxxxxxxxxx are
oom-can-panic-due-to-processes-stuck-in-__alloc_pages.patch
retries-in-ext3_prepare_write-violate-ordering-requirements.patch
add-process_session-helper-routine.patch
add-an-identifier-to-nsproxy.patch
rename-struct-pspace-to-struct-pid_namespace.patch
add-pid_namespace-to-nsproxy.patch
use-current-nsproxy-pid_ns.patch
add-child-reaper-to-pid_namespace.patch
-
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