From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
To: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Sasha Levin <sasha.levin@oracle.com>,
Hugh Dickins <hughd@google.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] mm/rmap: fix BUG at rmap_walk
Date: Thu, 19 Dec 2013 14:55:10 +0900 [thread overview]
Message-ID: <20131219055510.GA27532@lge.com> (raw)
In-Reply-To: <1387431715-6786-1-git-send-email-liwanp@linux.vnet.ibm.com>
On Thu, Dec 19, 2013 at 01:41:55PM +0800, Wanpeng Li wrote:
> This bug is introduced by commit 37f093cdf(mm/rmap: use rmap_walk() in
> page_referenced()). page_get_anon_vma() called in page_referenced_anon()
> will lock and increase the refcount of anon_vma. PageLocked is not required
> by page_referenced_anon() and there is not any assertion before, commit
> 37f093cdf introduced this extra BUG_ON() checking for anon page by mistake.
> This patch fix it by remove rmap_walk()'s VM_BUG_ON() and comment reason why
> the page must be locked for rmap_walk_ksm() and rmap_walk_file().
>
> [ 588.698828] kernel BUG at mm/rmap.c:1663!
> [ 588.699380] invalid opcode: 0000 [#2] PREEMPT SMP DEBUG_PAGEALLOC
> [ 588.700347] Dumping ftrace buffer:
> [ 588.701186] (ftrace buffer empty)
> [ 588.702062] Modules linked in:
> [ 588.702759] CPU: 0 PID: 4647 Comm: kswapd0 Tainted: G D W 3.13.0-rc4-next-20131218-sasha-00012-g1962367-dirty #4155
> [ 588.704330] task: ffff880062bcb000 ti: ffff880062450000 task.ti: ffff880062450000
> [ 588.705507] RIP: 0010:[<ffffffff81289c80>] [<ffffffff81289c80>] rmap_walk+0x10/0x50
> [ 588.706800] RSP: 0018:ffff8800624518d8 EFLAGS: 00010246
> [ 588.707515] RAX: 000fffff80080048 RBX: ffffea00000227c0 RCX: 0000000000000000
> [ 588.707515] RDX: 0000000000000000 RSI: ffff8800624518e8 RDI: ffffea00000227c0
> [ 588.707515] RBP: ffff8800624518d8 R08: ffff8800624518e8 R09: 0000000000000000
> [ 588.707515] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800624519d8
> [ 588.707515] R13: 0000000000000000 R14: ffffea00000227e0 R15: 0000000000000000
> [ 588.707515] FS: 0000000000000000(0000) GS:ffff880065200000(0000) knlGS:0000000000000000
> [ 588.707515] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [ 588.707515] CR2: 00007fec40cbe0f8 CR3: 00000000c2382000 CR4: 00000000000006f0
> [ 588.707515] Stack:
> [ 588.707515] ffff880062451958 ffffffff81289f4b ffff880062451918 ffffffff81289f80
> [ 588.707515] 0000000000000000 0000000000000000 ffffffff8128af60 0000000000000000
> [ 588.707515] 0000000000000024 0000000000000000 0000000000000000 0000000000000286
> [ 588.707515] Call Trace:
> [ 588.707515] [<ffffffff81289f4b>] page_referenced+0xcb/0x100
> [ 588.707515] [<ffffffff81289f80>] ? page_referenced+0x100/0x100
> [ 588.707515] [<ffffffff8128af60>] ? invalid_page_referenced_vma+0x170/0x170
> [ 588.707515] [<ffffffff81264302>] shrink_active_list+0x212/0x330
> [ 588.707515] [<ffffffff81260e23>] ? inactive_file_is_low+0x33/0x50
> [ 588.707515] [<ffffffff812646f5>] shrink_lruvec+0x2d5/0x300
> [ 588.707515] [<ffffffff812647b6>] shrink_zone+0x96/0x1e0
> [ 588.707515] [<ffffffff81265b06>] kswapd_shrink_zone+0xf6/0x1c0
> [ 588.707515] [<ffffffff81265f43>] balance_pgdat+0x373/0x550
> [ 588.707515] [<ffffffff81266d63>] kswapd+0x2f3/0x350
> [ 588.707515] [<ffffffff81266a70>] ? perf_trace_mm_vmscan_lru_isolate_template+0x120/0x120
> [ 588.707515] [<ffffffff8115c9c5>] kthread+0x105/0x110
> [ 588.707515] [<ffffffff8115c8c0>] ? set_kthreadd_affinity+0x30/0x30
> [ 588.707515] [<ffffffff843a6a7c>] ret_from_fork+0x7c/0xb0
> [ 588.707515] [<ffffffff8115c8c0>] ? set_kthreadd_affinity+0x30/0x30
> [ 588.707515] Code: c0 48 83 c4 18 89 d0 5b 41 5c 41 5d 41 5e 41 5f c9 c3 66 0f 1f 84
> 00 00 00 00 00 55 48 89 e5 66 66 66 66 90 48 8b 07 a8 01 75 10 <0f> 0b 66 0f 1f 44 00 0
> 0 eb fe 66 0f 1f 44 00 00 f6 47 08 01 74
> [ 588.707515] RIP [<ffffffff81289c80>] rmap_walk+0x10/0x50
> [ 588.707515] RSP <ffff8800624518d8>
>
> Reported-by: Sasha Levin <sasha.levin@oracle.com>
> Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Thanks for all relevant people. :)
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2013-12-19 5:55 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-19 5:41 [PATCH v3] mm/rmap: fix BUG at rmap_walk Wanpeng Li
2013-12-19 5:55 ` Joonsoo Kim [this message]
2013-12-19 6:07 ` Joonsoo Kim
2013-12-19 6:14 ` Wanpeng Li
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20131219055510.GA27532@lge.com \
--to=iamjoonsoo.kim@lge.com \
--cc=akpm@linux-foundation.org \
--cc=hughd@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=liwanp@linux.vnet.ibm.com \
--cc=sasha.levin@oracle.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).