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Re: 2.6.23-rc9: Oops in cache_alloc_refill() mm/slab.c

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[view original message]
From: Valerie Clement <valerie.clement@...>
To: Linux Kernel Mailing List <linux-kernel@...>
Subject: 2.6.23-rc9: Oops in cache_alloc_refill() mm/slab.c
Date: Thursday, October 4, 2007 - 12:13 pm

While running ffsb tests on my ext4 filesystem, I got an Oops in

cache_alloc_refill().

I turned on SLAB debugging and here is the message I got:


slab: Internal list corruption detected in cache 'buffer_head'(30),

slabp ffff81007e100100(1515870810). Hexdump:


000: 5a 5a 5a 5a 5a 5a 5a 5a b8 23 34 7e 00 81 ff ff

010: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a

020: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a

030: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a

040: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a

050: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a

060: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a a5

070: c0 88 56 63 c5 56 41 d8 f1 37 4a 80 ff ff ff ff

080: c0 88 56 63 c5 56 41 d8 80 33 53 7d 00 81 ff ff

090: e8 25 60 7d 00 81 ff ff 68 cb 3b 01 00 81 ff ff

0a0: 18 68 50 7d 00 81 ff ff

------------[ cut here ]------------

kernel BUG at /home/clementv/src/linux-2.6.23-rc9/mm/slab.c:2923!

invalid opcode: 0000 [1] SMP

CPU 2

Modules linked in: qla2xxx

Pid: 4041, comm: ffsb Not tainted 2.6.23-rc9 #2

RIP: 0010:[<ffffffff802758b6>]  [<ffffffff802758b6>] check_slabp+0xb5/0xc1

RSP: 0018:ffff8100774bb958  EFLAGS: 00010096

RAX: 0000000000000001 RBX: ffff81007e100100 RCX: 0000000000006d20

RDX: 00000000ffffffff RSI: 0000000000000046 RDI: ffff81007e347280

RBP: 00000000000000a8 R08: 0000000000000005 R09: ffffffff8060bb10

R10: 00000000000ae468 R11: 0000000500000002 R12: 00000000000000a8

R13: ffff81007e347280 R14: ffff81007e347280 R15: 0000000000000002

FS:  0000000041802950(0063) GS:ffff81007e0c4728(0000) knlGS:0000000000000000

CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b

CR2: 000000005f83d00c CR3: 0000000078149000 CR4: 00000000000006e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400

Process ffsb (pid: 4041, threadinfo ffff8100774ba000, task ffff81007dbdc7a0)

Stack:  000000000000000d 000000000000000e ffff81007e100100 ffff81007e342398

  ffff81007e078488 ffffffff80277069 ...
[ message continues ]
[view original message]
From: Badari Pulavarty <pbadari@...>
To: Valerie Clement <valerie.clement@...>
Cc: Linux Kernel Mailing List <linux-kernel@...>
Subject: Re: 2.6.23-rc9: Oops in cache_alloc_refill() mm/slab.c
Date: Thursday, October 4, 2007 - 5:43 pm

slabp->inuse = 1515870810 looks bogus. Is this easily reproducible ?


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[view original message]
From: Valerie Clement <valerie.clement@...>
To: Badari Pulavarty <pbadari@...>
Cc: Linux Kernel Mailing List <linux-kernel@...>, ext4 development <linux-ext4@...>
Subject: Re: 2.6.23-rc9: Oops in cache_alloc_refill() mm/slab.c
Date: Friday, October 5, 2007 - 9:41 am

Hi Badari,

Thanks for your answer.

I didn't reproduce it without the latest ext4 patches. So I suspect a

bug in one of them.

But how debugging this?

Which other debug traces can I turn on?


   Valérie


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[view original message]
From: Badari Pulavarty <pbadari@...>
To: Valerie Clement <valerie.clement@...>
Cc: Linux Kernel Mailing List <linux-kernel@...>, ext4 development <linux-ext4@...>, <cmm@...>
Subject: Re: 2.6.23-rc9: Oops in cache_alloc_refill() mm/slab.c
Date: Friday, October 5, 2007 - 10:54 am

Let me understand. You applied latest ext4 patchsets ? If so, Mingming

has some slab-cleanup changes in the patchset. You can try backing them

out and see. 


Thanks,

Badari


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[view original message]
From: Mingming Cao <cmm@...>
To: Badari Pulavarty <pbadari@...>
Cc: Valerie Clement <valerie.clement@...>, Linux Kernel Mailing List <linux-kernel@...>, ext4 development <linux-ext4@...>
Subject: Re: 2.6.23-rc9: Oops in cache_alloc_refill() mm/slab.c
Date: Friday, October 5, 2007 - 4:30 pm

It's unlikely to be the jbd_slab_cleanup.patch, which actually get rid

of slab allocation for buffers passing down to disk IO, and replace with

get_free_page directly.


Could you send me the profile used for ffsb test?


Thanks,

Mingming


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[view original message]
From: Mingming Cao <cmm@...>
To: Badari Pulavarty <pbadari@...>
Cc: Linux Kernel Mailing List <linux-kernel@...>, ext4 development <linux-ext4@...>
Subject: Re: 2.6.23-rc9: Oops in cache_alloc_refill() mm/slab.c
Date: Friday, October 5, 2007 - 6:06 pm

-------- Forwarded Message --------

From: Valerie Clement <valerie.clement@bull.net>

To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>

Subject: 2.6.23-rc9: Oops in cache_alloc_refill() mm/slab.c

Date: 	Thu, 04 Oct 2007 18:13:46 +0200

While running ffsb tests on my ext4 filesystem, I got an Oops in

cache_alloc_refill().

I turned on SLAB debugging and here is the message I got:


slab: Internal list corruption detected in cache 'buffer_head'(30),

slabp ffff81007e100100(1515870810). Hexdump:


=======================>


slabp->inuse counter looks corrupted (1515870810), it should not greater

than cachep->num looks valid (30)


000: 5a 5a 5a 5a 5a 5a 5a 5a b8 23 34 7e 00 81 ff ff

010: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a

020: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a

030: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a

040: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a

050: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a

060: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a a5

070: c0 88 56 63 c5 56 41 d8 f1 37 4a 80 ff ff ff ff

080: c0 88 56 63 c5 56 41 d8 80 33 53 7d 00 81 ff ff

090: e8 25 60 7d 00 81 ff ff 68 cb 3b 01 00 81 ff ff

0a0: 18 68 50 7d 00 81 ff ff

------------[ cut here ]------------

kernel BUG at /home/clementv/src/linux-2.6.23-rc9/mm/slab.c:2923!

invalid opcode: 0000 [1] SMP

CPU 2

Modules linked in: qla2xxx

Pid: 4041, comm: ffsb Not tainted 2.6.23-rc9 #2

RIP: 0010:[<ffffffff802758b6>]  [<ffffffff802758b6>] check_slabp+0xb5/0xc1

RSP: 0018:ffff8100774bb958  EFLAGS: 00010096

RAX: 0000000000000001 RBX: ffff81007e100100 RCX: 0000000000006d20

RDX: 00000000ffffffff RSI: 0000000000000046 RDI: ffff81007e347280

RBP: 00000000000000a8 R08: 0000000000000005 R09: ffffffff8060bb10

R10: 00000000000ae468 R11: 0000000500000002 R12: 00000000000000a8

R13: ffff81007e347280 R14: ffff81007e347280 R15: 0000000000000002

FS:  0000000041802950(0063) GS:ffff81007e0c4728(0000) knlGS:0000000000000000

CS:  0010 DS: 0000 ES: 0000 CR0...
[ message continues ]
Previous thread: [PATCH 00/32] Remove iget() and read_inode() [try #2] by David Howells on Thursday, October 4, 2007 - 11:56 am. (47 messages)

Next thread: [PATCH] Rename is_cgroup_init() by sukadev on Thursday, October 4, 2007 - 12:15 pm. (2 messages)