linux-kernel - Re: linux-next: slab shrinkers: BUG at mm/list

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Message-ID: <20130621090021.GB12424@dhcp22.suse.cz>
Date:	Fri, 21 Jun 2013 11:00:21 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Glauber Costa <glommer@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Chinner <david@...morbit.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: slab shrinkers: BUG at mm/list_lru.c:92

On Thu 20-06-13 17:12:01, Michal Hocko wrote:
> I am bisecting it again. It is quite tedious, though, because good case
> is hard to be sure about.

OK, so now I converged to 2d4fc052 (inode: convert inode lru list to generic lru
list code.) in my tree and I have double checked it matches what is in
the linux-next. This doesn't help much to pin point the issue I am
afraid :/

I have applied the inode_lru_isolate fix on each step.
$ git bisect log
git bisect start
# bad: [d02c11c146b626cf8e2586446773ba02999e4e2f] mm/sparse.c: put clear_hwpoisoned_pages within CONFIG_MEMORY_HOTREMOVE
git bisect bad d02c11c146b626cf8e2586446773ba02999e4e2f
# good: [58f6e0c8fb37e8e37d5ac17a61a53ac236c15047] Reverted "mm: tlb_fast_mode check missing in tlb_finish_mmu()"
git bisect good 58f6e0c8fb37e8e37d5ac17a61a53ac236c15047
# bad: [4ec7ecd30d643b12e1041226ff180da3d88918ee] include/linux/math64.h: add div64_ul()
git bisect bad 4ec7ecd30d643b12e1041226ff180da3d88918ee
# bad: [96dd4e69dc50c7ed18e407798f7f677fa5588eae] xfs: convert dquot cache lru to list_lru
git bisect bad 96dd4e69dc50c7ed18e407798f7f677fa5588eae
# bad: [2d4fc052823c2f598f03633e64bc0439cd2bfa04] inode: convert inode lru list to generic lru list code.
git bisect bad 2d4fc052823c2f598f03633e64bc0439cd2bfa04
# good: [cacbac6d9d80cc5277e8f67c7a474edb6488a5ea] dcache: remove dentries from LRU before putting on dispose list
git bisect good cacbac6d9d80cc5277e8f67c7a474edb6488a5ea
# good: [03a05514e71551bfdff1e3496a30b0fd5083f8fe] shrinker: convert superblock shrinkers to new API
git bisect good 03a05514e71551bfdff1e3496a30b0fd5083f8fe
# good: [ddc5bc7a8856e0e61ea9c2d4fcbcd3f85ecc92e7] list: add a new LRU list type
git bisect good ddc5bc7a8856e0e61ea9c2d4fcbcd3f85ecc92e7
-- 
Michal Hocko
SUSE Labs
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