From: Al Viro <viro@zeniv.linux.org.uk>
To: Xiang Gao <gxxa03070307@gmail.com>
Cc: brauner@kernel.org, oleg@redhat.com, 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 03:25:50 +0100 [thread overview]
Message-ID: <20250802022550.GT222315@ZenIV> (raw)
In-Reply-To: <20250802022123.3536934-1-gxxa03070307@gmail.com>
On Sat, Aug 02, 2025 at 10:21:23AM +0800, Xiang Gao wrote:
> From: gaoxiang17 <gaoxiang17@xiaomi.com>
>
> __task_pid_nr_ns
> ns = task_active_pid_ns(current);
> pid_nr_ns(rcu_dereference(*task_pid_ptr(task, type)), ns);
> if (pid && ns->level <= pid->level) {
>
> Sometimes null is returned for task_active_pid_ns. Then it will trigger kernel panic in pid_nr_ns.
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...
Details, please.
next prev parent reply other threads:[~2025-08-02 2:25 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 [this message]
2025-08-02 8:43 ` Oleg Nesterov
[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
2025-08-10 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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