linux-kernel - Re: [BUG] linux-next: Tree for April 9 warning on CC

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Date:	Thu, 10 Apr 2008 21:47:11 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Andy Whitcroft <apw@...dowen.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [BUG] linux-next: Tree for April 9 warning on
 CC_STACKPROTECTOR, followed by kernel panic

CC to Ingo ...

On Thu, 10 Apr 2008 15:09:17 +0530 Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com> wrote:
>
> Hi Stephen,
> 
> The next-20080409 kernel warns while booting up on a x86_64 machine.
> When compiled the kernel with CONFIG_CC_STACKPROTECTOR=y, the warning
> is followed by the kernel panic.
> 
> Testing -fstack-protector-all feature
> No -fstack-protector-stack-frame!
> -fstack-protector-all test failed
> ------------[ cut here ]------------
> WARNING: at kernel/panic.c:365 __stack_chk_test+0x4b/0x50()
> Modules linked in:
> Pid: 1, comm: swapper Not tainted 2.6.25-rc8-next-20080409-autotest #1
> 
> Call Trace:
>  [<ffffffff80231f5e>] warn_on_slowpath+0x51/0x63
>  [<ffffffff80232d93>] printk+0x4e/0x56
>  [<ffffffff80382fcd>] extract_entropy+0x47/0x90
>  [<ffffffff80230000>] dup_mm+0xca/0x3fd
>  [<ffffffff80231eba>] __stack_chk_test_func+0x21/0x32
>  [<ffffffff80231fbb>] __stack_chk_test+0x4b/0x50
>  [<ffffffff808ba8f1>] kernel_init+0x189/0x2f9
>  [<ffffffff804ee221>] _spin_unlock_irq+0x9/0xc
>  [<ffffffff8020cb88>] child_rip+0xa/0x12
>  [<ffffffff808ba768>] kernel_init+0x0/0x2f9
>  [<ffffffff8020cb7e>] child_rip+0x0/0x12
> 
> ---[ end trace d88d2f3a71e3b32c ]---
> Freeing unused kernel memory: 368k freed
> Write protecting the kernel read-only data: 4188k
> BUG: unable to handle kernel NULL pointer dereference at 00000000000002e8
> IP: [<ffffffff80286c11>] kmem_cache_alloc+0x19/0x6b
> PGD 3e925067 PUD 3e924067 PMD 0 
> Oops: 0000 [1] SMP 
> last sysfs file: 
> CPU 0 
> Modules linked in:
> Pid: 1, comm: init Not tainted 2.6.25-rc8-next-20080409-autotest #1
> RIP: 0010:[<ffffffff80286c11>]  [<ffffffff80286c11>] kmem_cache_alloc+0x19/0x6b
> RSP: 0000:ffff81003f9c9f08  EFLAGS: 00010046
> RAX: 0000000000000000 RBX: 0000000000000246 RCX: ffffffff80211f7e
> RDX: 00007fff1f89e710 RSI: 00000000000000d0 RDI: 0000000000000000
> RBP: 00007fff1f89e6f8 R08: 000000000065e300 R09: 000000000065e2e8
> R10: 000000000066d800 R11: 0000000000000203 R12: 00000000000000d0
> R13: 000000000047c290 R14: 000000000047c250 R15: 0000000000000000
> FS:  000000000066d870(0063) GS:ffffffff8067a000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 00000000000002e8 CR3: 000000003e921000 CR4: 00000000000006e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process init (pid: 1, threadinfo ffff81003f9c8000, task ffff81003f9c6000)
> Stack:  ffff81003f9c6000 00007fff1f89e6f8 0000000000000002 ffffffff80211f7e
>  ffff81003e920060 ffffffff8033419c ffff81003f9c6000 ffffffff8020d96a
>  0000000000000000 ffffffff804ee379 0000000000000000 000000000047c250
> Call Trace:
>  [<ffffffff80211f7e>] ? init_fpu+0x88/0xc9
>  [<ffffffff8033419c>] ? __up_read+0x13/0x8a
>  [<ffffffff8020d96a>] ? math_state_restore+0x19/0x5a
>  [<ffffffff804ee379>] ? error_exit+0x0/0x51
> 
> 
> Code: 4b 18 31 c0 48 89 f7 fc f3 aa 5b 5d 41 5c 48 89 f0 c3 41 54 41 89 f4 55 53 48 8b 4c 24 18 9c 5b fa 65 8b 04 25 24 00 00 00 48 98 <48> 8b ac c7 e8 02 00 00 48 8b 55 00 48 85 d2 75 10 83 ca ff 49 
> RIP  [<ffffffff80286c11>] kmem_cache_alloc+0x19/0x6b
>  RSP <ffff81003f9c9f08>
> CR2: 00000000000002e8
> ---[ end trace d88d2f3a71e3b32c ]---
> Kernel panic - not syncing: Attempted to kill init!
> Pid: 1, comm: init Tainted: G      D  2.6.25-rc8-next-20080409-autotest #1
> 
> Call Trace:
>  [<ffffffff8023225d>] panic+0x86/0x144
>  [<ffffffff80251911>] kallsyms_lookup+0x49/0x80
>  [<ffffffff80286c11>] kmem_cache_alloc+0x19/0x6b
>  [<ffffffff80232d93>] printk+0x4e/0x56
>  [<ffffffff80232d93>] printk+0x4e/0x56
>  [<ffffffff802351c9>] do_exit+0x71/0x682
>  [<ffffffff804ee731>] oops_begin+0x0/0x8c
>  [<ffffffff804f058d>] do_page_fault+0x738/0x7f3
>  [<ffffffff804ee379>] error_exit+0x0/0x51
>  [<ffffffff80211f7e>] init_fpu+0x88/0xc9
>  [<ffffffff80286c11>] kmem_cache_alloc+0x19/0x6b
>  [<ffffffff80211f7e>] init_fpu+0x88/0xc9
>  [<ffffffff8033419c>] __up_read+0x13/0x8a
>  [<ffffffff8020d96a>] math_state_restore+0x19/0x5a
>  [<ffffffff804ee379>] error_exit+0x0/0x51
> 
> -- 
> Thanks & Regards,
> Kamalesh Babulal,
> Linux Technology Center,
> IBM, ISTL.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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