Re: [patch 0/7] improve memcg oom killer robustness v2

[Michal Hocko]

On Wed 18-09-13 16:03:04, azurIt wrote:
[..]
> I was finally able to get stack of problematic process :) I saved it
> two times from the same process, as Michal suggested (i wasn't able to
> take more). Here it is:
> 
> First (doesn't look very helpfull):
> [<ffffffffffffffff>] 0xffffffffffffffff

No it is not.
 
> Second:
> [<ffffffff810e17d1>] shrink_zone+0x481/0x650
> [<ffffffff810e2ade>] do_try_to_free_pages+0xde/0x550
> [<ffffffff810e310b>] try_to_free_pages+0x9b/0x120
> [<ffffffff81148ccd>] free_more_memory+0x5d/0x60
> [<ffffffff8114931d>] __getblk+0x14d/0x2c0
> [<ffffffff8114c973>] __bread+0x13/0xc0
> [<ffffffff811968a8>] ext3_get_branch+0x98/0x140
> [<ffffffff81197497>] ext3_get_blocks_handle+0xd7/0xdc0
> [<ffffffff81198244>] ext3_get_block+0xc4/0x120
> [<ffffffff81155b8a>] do_mpage_readpage+0x38a/0x690
> [<ffffffff81155ffb>] mpage_readpages+0xfb/0x160
> [<ffffffff811972bd>] ext3_readpages+0x1d/0x20
> [<ffffffff810d9345>] __do_page_cache_readahead+0x1c5/0x270
> [<ffffffff810d9411>] ra_submit+0x21/0x30
> [<ffffffff810cfb90>] filemap_fault+0x380/0x4f0
> [<ffffffff810ef908>] __do_fault+0x78/0x5a0
> [<ffffffff810f2b24>] handle_pte_fault+0x84/0x940
> [<ffffffff810f354a>] handle_mm_fault+0x16a/0x320
> [<ffffffff8102715b>] do_page_fault+0x13b/0x490
> [<ffffffff815cb87f>] page_fault+0x1f/0x30
> [<ffffffffffffffff>] 0xffffffffffffffff

This is the direct reclaim path. You are simply running out of memory
globaly. There is no memcg specific code in that trace.
-- 
Michal Hocko
SUSE Labs
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