linux-kernel - Re: Runtime trouble with commit dbd952127d (seccomp: introduce writer locking)

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Message-ID: <CA+55aFz3vW_qnrwa6kWMsN1pGbjnyGXGBNhH=DO0berKgyOtgQ@mail.gmail.com>
Date:	Sun, 10 Aug 2014 14:10:49 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Oleg Nesterov <oleg@...hat.com>, Kees Cook <keescook@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: Runtime trouble with commit dbd952127d (seccomp: introduce writer locking)

On Sun, Aug 10, 2014 at 1:51 PM, Guenter Roeck <linux@...ck-us.net> wrote:
> That means that the broken configuration is (CONFIG_DEBUG_SPINLOCK=n,
> CONFIG_SMP=n).
> It also means that the BUG_ON checks introduced with the seccomp commit
> will cause this configuration to fail hard at least for architectures where
> CONFIG_SMP
> can be disabled, and if those architectures use
> include/linux/spinlock_types_up.h.

Yes. This is why we have "assert_spin_locked()". You can't use
BUG_ON(spin_is_locked()), and !spin_is_locked() tends to be even worse
unless you can prove that nobody else can get the lock simultaneously.

           Linus
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