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Date: Sat, 4 Apr 2015 03:47:12 +0300
From: Konstantin Khlebnikov <koct9i@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
Sasha Levin <sasha.levin@...cle.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/memory: print also a_ops->readpage in print_bad_pte
On Sat, Apr 4, 2015 at 1:10 AM, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Fri, 03 Apr 2015 20:18:18 +0300 Konstantin Khlebnikov <khlebnikov@...dex-team.ru> wrote:
>
>> A lot of filesystems use generic_file_mmap() and filemap_fault(),
>> f_op->mmap and vm_ops->fault aren't enough to identify filesystem.
>>
>> This prints file name, vm_ops->fault, f_op->mmap and a_ops->readpage
>> (which is almost always implemented and filesystem-specific).
>>
>> Example:
>>
>> [ 23.676410] BUG: Bad page map in process sh pte:1b7e6025 pmd:19bbd067
>> [ 23.676887] page:ffffea00006df980 count:4 mapcount:1 mapping:ffff8800196426c0 index:0x97
>> [ 23.677481] flags: 0x10000000000000c(referenced|uptodate)
>> [ 23.677896] page dumped because: bad pte
>> [ 23.678205] addr:00007f52fcb17000 vm_flags:00000075 anon_vma: (null) mapping:ffff8800196426c0 index:97
>> [ 23.678922] file:libc-2.19.so fault:filemap_fault mmap:generic_file_readonly_mmap readpage:v9fs_vfs_readpage
>
> Is that why we print these out? Just to identify the fs type?
>
> There's always vma->vm_file->f_inode->i_sb->s_magic ;)
Yes, but that also might be anon inode/file mapped by some driver, so
s_magic isn't enough.
>
>
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