From: Michal Hocko <mhocko@kernel.org>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: willy@infradead.org, akpm@linux-foundation.org,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
viro@zeniv.linux.org.uk, kirill.shutemov@linux.intel.com,
riel@redhat.com
Subject: Re: [PATCH] mm: Check for SIGKILL inside dup_mmap() loop.
Date: Tue, 3 Apr 2018 15:06:28 +0200 [thread overview]
Message-ID: <20180403130628.GZ5501@dhcp22.suse.cz> (raw)
In-Reply-To: <201804032129.HIH05759.FJOFOQLtVHMFSO@I-love.SAKURA.ne.jp>
On Tue 03-04-18 21:29:52, Tetsuo Handa wrote:
> Michal Hocko wrote:
[...]
> > Please be aware that we _do_ allocate in the exit path. I have a strong
> > suspicion that even while fatal signal is pending. Do we really want
> > fail those really easily.
>
> Does the exit path mean inside do_exit() ? If yes, fatal signals are already
> cleared before reaching do_exit().
They usually are. But we can send a SIGKILL on an already killed task
after it removed the previously deadly signal already AFAIR. Maybe I
mis-remember of course. Signal handling code always makes my head
explode and I tend to forget all the details. Anyway relying on
fatal_signal_pending for some allocator semantic is just too subtle.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2018-04-03 13:06 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-29 11:27 [PATCH] mm: Check for SIGKILL inside dup_mmap() loop Tetsuo Handa
2018-03-29 21:30 ` Andrew Morton
2018-03-30 10:34 ` Tetsuo Handa
2018-04-03 12:14 ` Matthew Wilcox
2018-04-03 12:19 ` Michal Hocko
2018-04-03 12:25 ` Matthew Wilcox
2018-04-03 14:54 ` Tetsuo Handa
2018-04-03 12:29 ` Tetsuo Handa
2018-04-03 13:06 ` Michal Hocko [this message]
2018-04-03 11:16 ` Michal Hocko
2018-04-03 11:32 ` Tetsuo Handa
2018-04-03 11:38 ` Michal Hocko
2018-04-03 11:58 ` Matthew Wilcox
2018-04-03 12:08 ` Michal Hocko
2018-04-07 10:38 ` Tetsuo Handa
2018-04-18 21:44 ` Andrew Morton
2018-04-19 1:54 ` Tetsuo Handa
2018-04-19 2:32 ` Andrew Morton
2018-06-07 22:05 ` Andrew Morton
2018-06-08 17:05 ` Matthew Wilcox
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