From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Alan Cox <alan@llwyncelyn.cymru>, Christoph Hellwig <hch@lst.de>,
Michal Hocko <mhocko@suse.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
kernel-team@fb.com
Subject: Re: [PATCH 1/2] Revert "vmalloc: back off when the current task is killed"
Date: Thu, 5 Oct 2017 05:49:43 +0900 [thread overview]
Message-ID: <ab688e7c-75c1-e942-ef44-44615d9fb394@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <20171004185906.GB2136@cmpxchg.org>
On 2017/10/05 3:59, Johannes Weiner wrote:
> But the justification to make that vmalloc() call fail like this isn't
> convincing, either. The patch mentions an OOM victim exhausting the
> memory reserves and thus deadlocking the machine. But the OOM killer
> is only one, improbable source of fatal signals. It doesn't make sense
> to fail allocations preemptively with plenty of memory in most cases.
By the time the current thread reaches do_exit(), fatal_signal_pending(current)
should become false. As far as I can guess, the source of fatal signal will be
tty_signal_session_leader(tty, exit_session) which is called just before
tty_ldisc_hangup(tty, cons_filp != NULL) rather than the OOM killer. I don't
know whether it is possible to make fatal_signal_pending(current) true inside
do_exit() though...
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next prev parent reply other threads:[~2017-10-04 20:50 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-03 22:55 tty crash due to auto-failing vmalloc Johannes Weiner
2017-10-03 23:51 ` Alan Cox
2017-10-04 8:33 ` Michal Hocko
2017-10-04 18:58 ` Johannes Weiner
2017-10-04 18:59 ` [PATCH 1/2] Revert "vmalloc: back off when the current task is killed" Johannes Weiner
2017-10-04 20:49 ` Tetsuo Handa [this message]
2017-10-04 21:00 ` Johannes Weiner
2017-10-04 21:42 ` Tetsuo Handa
2017-10-04 23:21 ` Johannes Weiner
2017-10-04 22:32 ` Andrew Morton
2017-10-04 23:18 ` Johannes Weiner
2017-10-05 7:57 ` Michal Hocko
2017-10-05 10:36 ` Tetsuo Handa
2017-10-05 10:49 ` Michal Hocko
2017-10-07 2:21 ` Tetsuo Handa
2017-10-07 2:51 ` Johannes Weiner
2017-10-07 4:05 ` Tetsuo Handa
2017-10-07 7:59 ` Michal Hocko
2017-10-07 9:57 ` Tetsuo Handa
2017-10-05 6:49 ` Vlastimil Babka
2017-10-05 7:54 ` Michal Hocko
2017-10-04 18:59 ` [PATCH 2/2] tty: fall back to N_NULL if switching to N_TTY fails during hangup Johannes Weiner
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