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authorKirill Korotaev <dev@openvz.org>2006-12-06 20:32:27 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:22 -0800
commitb43a57bb4dae72e8f7232e7c821a8799eda30022 (patch)
tree4293286b44c8b11bac6a03c4ddfe75aea40aa089 /mm/page_alloc.c
parenta3eea484f7a1aadb70ed6665338026a09ad6ce85 (diff)
[PATCH] OOM can panic due to processes stuck in __alloc_pages()
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@sw.ru> Signed-off-by: Kirill Korotaev <dev@openvz.org> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index cd47e8f7bd5b..a840e702722c 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1180,6 +1180,7 @@ 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)) {
@@ -1201,7 +1202,6 @@ nofail_alloc:
if (!wait)
goto nopage;
-rebalance:
cond_resched();
/* We now go into synchronous reclaim */