linux-kernel - Re: -next June 21: WARNING: at include/linux/tty.h

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Date:	Wed, 23 Jun 2010 16:55:57 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Sachin Sant <sachinp@...ibm.com>
Cc:	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	arnd@...db.de, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: -next June 21: WARNING: at include/linux/tty.h

On Tue, 22 Jun 2010 10:55:54 +0530 Sachin Sant <sachinp@...ibm.com> wrote:
>
> With next-20100621 on a x86_64 box came across this warning :
> 
> TCP cubic registered
> registered taskstats version 1
> ------------[ cut here ]------------
> WARNING: at include/linux/tty.h:589 tty_open+0x76/0x57a()
> Hardware name: BladeCenter LS21 -[79716AA]-
> Modules linked in:
> Pid: 1, comm: swapper Not tainted 2.6.35-rc3-autotest-next-20100621 #1
> Call Trace:
>  [<ffffffff812428d8>] ? tty_open+0x76/0x57a
>  [<ffffffff8103cf39>] warn_slowpath_common+0x80/0xae
>  [<ffffffff8103cf7c>] warn_slowpath_null+0x15/0x17
>  [<ffffffff812428d8>] tty_open+0x76/0x57a
>  [<ffffffff810d4544>] ? exact_match+0x0/0x9
>  [<ffffffff810d491f>] chrdev_open+0x133/0x152
>  [<ffffffff810d47ec>] ? chrdev_open+0x0/0x152
>  [<ffffffff810d07b4>] __dentry_open+0x140/0x252
>  [<ffffffff810d0990>] nameidata_to_filp+0x3e/0x4f
>  [<ffffffff810db588>] do_last+0x51a/0x643
>  [<ffffffff810dd621>] do_filp_open+0x23d/0x5f8
>  [<ffffffff810c1ba8>] ? slab_node+0x3c/0x78
>  [<ffffffff810d05a1>] do_sys_open+0x5a/0xf0
>  [<ffffffff810d0660>] sys_open+0x1b/0x1d
>  [<ffffffff818e66fc>] kernel_init+0x1b3/0x220
>  [<ffffffff810036d4>] kernel_thread_helper+0x4/0x10
>  [<ffffffff818e6549>] ? kernel_init+0x0/0x220
>  [<ffffffff810036d0>] ? kernel_thread_helper+0x0/0x10
> ---[ end trace 108cb769a1c0e534 ]---
> 
> This warning seem to have been introduced with next-20100617.
> The corresponding code is :
> 
> 585 static inline void tty_lock(void) __acquires(kernel_lock)
> 586 {
> 587 #ifdef CONFIG_LOCK_KERNEL
> 588         /* kernel_locked is 1 for !CONFIG_LOCK_KERNEL */
> 589         WARN_ON(kernel_locked());
> 590 #endif
> 591         lock_kernel();
> 592 }
> 
> which was added by commit 01510c869f9..
> 
> tty: replace BKL with a new tty_lock

I am getting a similar (the same) warning on a Power7 box I boot test:

Badness at include/linux/tty.h:589
NIP: c000000000339244 LR: c00000000033922c CTR: c000000000339178
REGS: c0000007a606f690 TRAP: 0700   Not tainted  (2.6.35-rc3-autokern1-next-20100623)
MSR: 8000000000029032 <EE,ME,CE,IR,DR>  CR: 24244022  XER: 20000010
TASK = c000000f970d8000[1] 'swapper' THREAD: c0000007a606c000 CPU: 0
GPR00: 0000000000000001 c0000007a606f910 c0000000009a1450 c0000000009105f0 
GPR04: c0000007a585f200 c000000000a6e588 0000000000000000 c000000f9a002800 
GPR08: 0000000000000017 c000000f970d8000 00000000007fffff c0000000003397c8 
GPR12: 0000000024222028 c000000001fc3000 0000000000000000 ffffffffffffff9c 
GPR16: 0000000002d80000 0000000000000000 c0000007a606fcd0 0000000000010002 
GPR20: c0000000009105f0 ffffffffffffffff c0000007a606f980 fffffffffffff000 
GPR24: c0000007a9028648 0000000000040001 0000000000000000 0000000000500001 
GPR28: c0000007a585f200 c000000000a6e588 c00000000093fd68 0000000000000000 
NIP [c000000000339244] .tty_open+0xcc/0x650
LR [c00000000033922c] .tty_open+0xb4/0x650
Call Trace:
[c0000007a606f910] [c00000000033922c] .tty_open+0xb4/0x650 (unreliable)
[c0000007a606fa10] [c00000000013eb20] .chrdev_open+0x230/0x278
[c0000007a606fad0] [c000000000138bc8] .__dentry_open+0x1e8/0x35c
[c0000007a606fb90] [c000000000148580] .do_last+0x5bc/0x764
[c0000007a606fc50] [c00000000014a8c8] .do_filp_open+0x26c/0x734
[c0000007a606fe30] [c0000000001388e4] .do_sys_open+0x84/0x154
[c0000007a606fee0] [c00000000083d4f8] .kernel_init+0x288/0x324
[c0000007a606ff90] [c0000000000261e0] .kernel_thread+0x54/0x70
Instruction dump:
60000001 7d1b0000 835c0038 7e83a378 92a10070 48264a25 60000000 575a05ee 
e92d01b0 8009001c 7c0000f8 54000ffe <0b000000> ea5e80b0 ea3e80a8 38a0024f 

I get this twice for each boot.
-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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