From: Minchan Kim <minchan@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>, linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
stable@kernel.org, Wu Fangsuo <fangsuowu@asrmicro.com>
Subject: Re: [PATCH] mm: fix trying to reclaim unevicable LRU page
Date: Fri, 24 May 2019 16:21:45 +0900 [thread overview]
Message-ID: <20190524072145.GA106222@google.com> (raw)
In-Reply-To: <20190524071114.74202-1-minchan@kernel.org>
On Fri, May 24, 2019 at 04:11:14PM +0900, Minchan Kim wrote:
> There was below bugreport from Wu Fangsuo.
>
> 7200 [ 680.491097] c4 7125 (syz-executor) page:ffffffbf02f33b40 count:86 mapcount:84 mapping:ffffffc08fa7a810 index:0x24
> 7201 [ 680.531186] c4 7125 (syz-executor) flags: 0x19040c(referenced|uptodate|arch_1|mappedtodisk|unevictable|mlocked)
> 7202 [ 680.544987] c0 7125 (syz-executor) raw: 000000000019040c ffffffc08fa7a810 0000000000000024 0000005600000053
> 7203 [ 680.556162] c0 7125 (syz-executor) raw: ffffffc009b05b20 ffffffc009b05b20 0000000000000000 ffffffc09bf3ee80
> 7204 [ 680.566860] c0 7125 (syz-executor) page dumped because: VM_BUG_ON_PAGE(PageLRU(page) || PageUnevictable(page))
> 7205 [ 680.578038] c0 7125 (syz-executor) page->mem_cgroup:ffffffc09bf3ee80
> 7206 [ 680.585467] c0 7125 (syz-executor) ------------[ cut here ]------------
> 7207 [ 680.592466] c0 7125 (syz-executor) kernel BUG at /home/build/farmland/adroid9.0/kernel/linux/mm/vmscan.c:1350!
> 7223 [ 680.603663] c0 7125 (syz-executor) Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
> 7224 [ 680.611436] c0 7125 (syz-executor) Modules linked in:
> 7225 [ 680.616769] c0 7125 (syz-executor) CPU: 0 PID: 7125 Comm: syz-executor Tainted: G S 4.14.81 #3
> 7226 [ 680.626826] c0 7125 (syz-executor) Hardware name: ASR AQUILAC EVB (DT)
> 7227 [ 680.633623] c0 7125 (syz-executor) task: ffffffc00a54cd00 task.stack: ffffffc009b00000
> 7228 [ 680.641917] c0 7125 (syz-executor) PC is at shrink_page_list+0x1998/0x3240
> 7229 [ 680.649144] c0 7125 (syz-executor) LR is at shrink_page_list+0x1998/0x3240
> 7230 [ 680.656303] c0 7125 (syz-executor) pc : [<ffffff90083a2158>] lr : [<ffffff90083a2158>] pstate: 60400045
> 7231 [ 680.666086] c0 7125 (syz-executor) sp : ffffffc009b05940
> ..
> 7342 [ 681.671308] c0 7125 (syz-executor) [<ffffff90083a2158>] shrink_page_list+0x1998/0x3240
> 7343 [ 681.679567] c0 7125 (syz-executor) [<ffffff90083a3dc0>] reclaim_clean_pages_from_list+0x3c0/0x4f0
> 7344 [ 681.688793] c0 7125 (syz-executor) [<ffffff900837ed64>] alloc_contig_range+0x3bc/0x650
> 7347 [ 681.717421] c0 7125 (syz-executor) [<ffffff90084925cc>] cma_alloc+0x214/0x668
> 7348 [ 681.724892] c0 7125 (syz-executor) [<ffffff90091e4d78>] ion_cma_allocate+0x98/0x1d8
> 7349 [ 681.732872] c0 7125 (syz-executor) [<ffffff90091e0b20>] ion_alloc+0x200/0x7e0
> 7350 [ 681.740302] c0 7125 (syz-executor) [<ffffff90091e154c>] ion_ioctl+0x18c/0x378
> 7351 [ 681.747738] c0 7125 (syz-executor) [<ffffff90084c6824>] do_vfs_ioctl+0x17c/0x1780
> 7352 [ 681.755514] c0 7125 (syz-executor) [<ffffff90084c7ed4>] SyS_ioctl+0xac/0xc0
>
> Wu found it's due to [1]. Before that, unevictable page goes to cull_mlocked
> routine so that it couldn't reach the VM_BUG_ON_PAGE line.
>
> To fix the issue, this patch filter out unevictable LRU pages
> from the reclaim_clean_pages_from_list in CMA.
>
> [1] ad6b67041a45, mm: remove SWAP_MLOCK in ttu
>
> Cc: <stable@kernel.org> [4.12+]
> Reported-debugged-by: Wu Fangsuo <fangsuowu@asrmicro.com>
Tested-by: Wu Fangsuo <fangsuowu@asrmicro.com>
I forgot to add his Tested-by. Sorry about that.
next prev parent reply other threads:[~2019-05-24 7:21 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-24 7:11 [PATCH] mm: fix trying to reclaim unevicable LRU page Minchan Kim
2019-05-24 7:21 ` Minchan Kim [this message]
2019-05-28 15:14 ` Michal Hocko
2019-05-30 2:42 ` Minchan Kim
2019-06-04 12:28 ` Michal Hocko
2019-06-10 9:42 ` Minchan Kim
2019-06-10 10:39 ` Michal Hocko
2019-06-10 11:21 ` Minchan Kim
2019-06-10 21:13 ` Michal Hocko
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