From: Oleg Nesterov <oleg@redhat.com>
To: Al Viro <viro@zeniv.linux.org.uk>
Cc: Xiang Gao <gxxa03070307@gmail.com>,
brauner@kernel.org, mjguzik@gmail.com, Liam.Howlett@oracle.com,
joel.granados@kernel.org, lorenzo.stoakes@oracle.com,
linux-kernel@vger.kernel.org, gaoxiang17 <gaoxiang17@xiaomi.com>
Subject: Re: [PATCH] pid: Add a judgment for ns null in pid_nr_ns
Date: Sat, 2 Aug 2025 10:43:17 +0200 [thread overview]
Message-ID: <20250802084316.GA31711@redhat.com> (raw)
In-Reply-To: <20250802022550.GT222315@ZenIV>
On 08/02, Al Viro wrote:
>
> In which conditions does that happen?
>
> > __task_pid_nr_ns+0x74/0xd0
> > ...
> > __handle_irq_event_percpu+0xd4/0x284
> > handle_irq_event+0x48/0xb0
>
> Huh? Just what is it doing inside an IRQ handler?
> Hell, the notion of current process is not usable in those,
> let alone any properties of such...
Well, at least get_curent() should work in this case...
But we can forget about IRQ. I guess the problem is that if the exiting
task has already passed exit_notify() and it was (auto)reaped, then, say,
task_pid_vnr(&init_task) will crash.
Not that I think the exiting task should do anything like this...
Oleg.
next prev parent reply other threads:[~2025-08-02 8:44 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-02 2:21 [PATCH] pid: Add a judgment for ns null in pid_nr_ns Xiang Gao
2025-08-02 2:25 ` Al Viro
[not found] ` <15b18541f37447dd8d5dbd8012662f67@xiaomi.com>
2025-08-02 5:52 ` 答复: [External Mail]Re: " Al Viro
2025-08-02 5:54 ` Al Viro
[not found] ` <c7968242db914979953277226fe55fc8@xiaomi.com>
2025-08-02 8:04 ` 答复: " Al Viro
2025-08-02 8:45 ` Oleg Nesterov
[not found] ` <80be47cb31d14ffc9f9a7d8d4408ab0a@xiaomi.com>
2025-08-04 11:49 ` Oleg Nesterov
2025-08-04 12:14 ` Christian Brauner
2025-08-04 12:44 ` Oleg Nesterov
2025-08-05 12:43 ` Oleg Nesterov
2025-08-08 14:56 ` Christian Brauner
2025-08-10 15:42 ` Oleg Nesterov
[not found] ` <aa5272ddcec944e2a35ca7104f6a86bf@xiaomi.com>
2025-08-05 19:43 ` 答复: [External Mail]Re: " Oleg Nesterov
2025-08-08 14:54 ` Christian Brauner
2025-08-02 8:43 ` Oleg Nesterov [this message]
2025-08-10 17:36 ` [PATCH 1/4] pid: make __task_pid_nr_ns(ns => NULL) safe for zombie callers Oleg Nesterov
2025-08-10 17:36 ` [PATCH 2/4] pid: introduce task_ppid_vnr() Oleg Nesterov
2025-08-10 17:36 ` [PATCH 3/4] pid: change bacct_add_tsk() to use task_ppid_nr_ns() Oleg Nesterov
2025-08-10 17:36 ` [PATCH 4/4] pid: change task_state() " Oleg Nesterov
2025-08-19 11:40 ` [PATCH] pid: Add a judgment for ns null in pid_nr_ns Christian Brauner
2025-08-19 14:25 ` Oleg Nesterov
2025-09-01 15:30 ` Oleg Nesterov
2025-09-01 15:44 ` Mateusz Guzik
2025-09-01 15:55 ` Mateusz Guzik
2025-09-02 14:37 ` Oleg Nesterov
2026-01-04 7:25 ` Qing Wang
-- strict thread matches above, loose matches on Subject: below --
2025-02-11 6:17 Xiang Gao
2025-02-11 6:49 ` Baoquan He
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