From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: Tigran Aivazian <aivazian.tigran@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-fsdevel@vger.kernel.org,
syzbot <syzbot+71c6b5d68e91149fc8a4@syzkaller.appspotmail.com>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Subject: Re: [PATCH] bfs: add sanity check at bfs_fill_super().
Date: Wed, 13 Jun 2018 22:33:08 +0900 [thread overview]
Message-ID: <9ef86114-02d6-b243-203d-fbbdab95a6fa@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <20180509165321.3b2b1313fde0f007c1a5a015@linux-foundation.org>
On 2018/05/10 8:53, Andrew Morton wrote:
> On Thu, 10 May 2018 08:46:18 +0900 Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> wrote:
>
>>> page-allocation-fauilure warning and a nice backtrace, etc. Why
>>> suppress all of that and add our custom warning instead?
>>
>> the intent of this patch is to avoid panic() by panic_on_warn == 1
>> due to hitting
>>
>> struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags)
>> {
>> unsigned int index;
>>
>> if (unlikely(size > KMALLOC_MAX_SIZE)) {
>> WARN_ON_ONCE(!(flags & __GFP_NOWARN)); /* <= this line */
>> return NULL;
>> }
>>
>> when size to allocate is controlled by the filesystem image.
>
> Well, the same could happen with many many memory-allocation sites.
> What's special about BFS? If someone sets panic_on_warn=1 then
> presumably this panic is the behaviour they wanted in this case.
>
Tigran, this patch is stalling. Do we want to apply this? Or, ignore as invalid?
errors=panic mount option for ext4 case was ignored as invalid.
http://lkml.kernel.org/r/CACT4Y+Z+2YW_VALJzzQr6hLsviA=dXk3iFqwVf+P5zqojeC9Zg@mail.gmail.com
But I prefer avoiding crashes if we can fix it.
next prev parent reply other threads:[~2018-06-13 13:33 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-09 10:35 [PATCH] bfs: add sanity check at bfs_fill_super() Tetsuo Handa
2018-05-09 23:06 ` Andrew Morton
[not found] ` <201805092346.w49NkINl045657@www262.sakura.ne.jp>
2018-05-09 23:53 ` Andrew Morton
2018-06-13 13:33 ` Tetsuo Handa [this message]
2018-06-13 13:49 ` Tigran Aivazian
2018-06-13 16:00 ` Dmitry Vyukov
2018-06-14 12:23 ` Tigran Aivazian
2018-06-14 12:38 ` Dmitry Vyukov
2018-06-14 13:05 ` Tigran Aivazian
2018-06-14 13:12 ` Dmitry Vyukov
2018-06-14 13:28 ` Tetsuo Handa
2018-06-14 15:13 ` Tigran Aivazian
2018-06-14 16:15 ` Tigran Aivazian
2018-06-14 19:00 ` Tigran Aivazian
2018-06-14 22:18 ` Tetsuo Handa
2018-06-15 10:45 ` Tigran Aivazian
2018-06-13 22:09 ` Tetsuo Handa
2018-06-14 7:38 ` Tigran Aivazian
2018-06-14 10:45 ` Tetsuo Handa
2018-06-14 12:11 ` Tigran Aivazian
2018-05-10 0:53 ` Matthew Wilcox
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=9ef86114-02d6-b243-203d-fbbdab95a6fa@I-love.SAKURA.ne.jp \
--to=penguin-kernel@i-love.sakura.ne.jp \
--cc=aivazian.tigran@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=syzbot+71c6b5d68e91149fc8a4@syzkaller.appspotmail.com \
--cc=syzkaller-bugs@googlegroups.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).