linux-kernel - Re: [PATCH] connector: Fix sid connector (was: Badness at kernel/softirq.c:143...)

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Message-ID: <20090929170722.GA32330@ioremap.net>
Date:	Tue, 29 Sep 2009 21:07:22 +0400
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Scott James Remnant <scott@...ntu.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Matt Helsley <matthltc@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] connector: Fix sid connector (was: Badness at kernel/softirq.c:143...)

On Tue, Sep 29, 2009 at 05:12:33PM +0200, Christian Borntraeger (borntraeger@...ibm.com) wrote:
> just in case the discussion concludes that my patch is fine,
> here is a fixed version.
> 
> [PATCH] connector: Fix sid connector
> 
> The sid connector gives the following warning:
> Badness at kernel/softirq.c:143
> [...]
> Call Trace:
> ([<000000013fe04100>] 0x13fe04100)
>  [<000000000048a946>] sk_filter+0x9a/0xd0
>  [<000000000049d938>] netlink_broadcast+0x2c0/0x53c
>  [<00000000003ba9ae>] cn_netlink_send+0x272/0x2b0
>  [<00000000003baef0>] proc_sid_connector+0xc4/0xd4
>  [<0000000000142604>] __set_special_pids+0x58/0x90
>  [<0000000000159938>] sys_setsid+0xb4/0xd8
>  [<00000000001187fe>] sysc_noemu+0x10/0x16
>  [<00000041616cb266>] 0x41616cb266
> 
> The warning is
> --->    WARN_ON_ONCE(in_irq() || irqs_disabled());
> 
> The network code must not be called with disabled interrupts but
> sys_setsid holds the tasklist_lock with spinlock_irq while calling
> the connector. We can safely move proc_sid_connector from
> __set_special_pids to sys_setsid.
> 
> Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>

Looks good, thank you.
Ack.

-- 
	Evgeniy Polyakov
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