linux-kernel - Re: 2.6.25-mm1: not looking good

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Date:	Fri, 18 Apr 2008 09:40:07 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	"James Morris" <jmorris@...ei.org>,
	"Stephen Smalley" <sds@...ho.nsa.gov>
Subject: Re: 2.6.25-mm1: not looking good

On Fri, Apr 18, 2008 at 2:03 AM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
>  After 10 or fifteen minutes uptime, slab declared game over:
>
>  kernel BUG at mm/slab.c:590!
>  invalid opcode: 0000 [1] SMP
>  last sysfs file: /sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0/0000:02:02.0/0000:05:00.1/irq
>  CPU 5
>  Modules linked in: nfsd auth_rpcgss exportfs lockd nfs_acl autofs4 hidp rfcomm l2cap bluetooth sunrpc ipv6 dm_mirror dm_log dm_multipath dm_mod sbs sbshc battery ac parport_pc lp parport sg floppy snd_hda_intel snd_seq_dummy ide_cd_mod cdrom snd_seq_oss snd_seq_midi_event snd_seq serio_raw snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_timer i2c_i801 snd button soundcore i2c_core snd_page_alloc shpchp pcspkr ehci_hcd ohci_hcd uhci_hcd
>  Pid: 0, comm: swapper Tainted: G        W 2.6.25-mm1 #4
>  RIP: 0010:[<ffffffff8028fea8>]  [<ffffffff8028fea8>] page_get_cache+0x19/0x24
>  RSP: 0018:ffff81025f22fe88  EFLAGS: 00010046
>  RAX: 0000000000000000 RBX: ffffe20000028440 RCX: 0000000000000007
>  RDX: 0000000000000000 RSI: ffffe20000028440 RDI: 0000000000000040
>  RBP: ffff81025f22fe90 R08: 0000000000000006 R09: ffff810001080fe8
>  R10: ffff8100010b7a40 R11: ffff8100010b7a28 R12: 0000000000000282
>  R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
>  FS:  0000000000000000(0000) GS:ffff81025f1616c0(0000) knlGS:0000000000000000
>  CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
>  CR2: 0000003e5f0948f0 CR3: 000000024a01e000 CR4: 00000000000006e0
>  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>  DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>  Process swapper (pid: 0, threadinfo ffff81025f22a000, task ffff81025f2294a0)
>  Stack:  ffffffff80a11690 ffff81025f22fea0 ffffffff8028fec4 ffff81025f22fec0
>   ffffffff802909af 0000000000000000 ffff8100010b4820 ffff81025f22fed0
>   ffffffff80327789 ffff81025f22ff00 ffffffff80268932 0000000000000001
>  Call Trace:
>   <IRQ>  [<ffffffff8028fec4>] virt_to_cache+0x11/0x13
>   [<ffffffff802909af>] kfree+0x20/0x38
>   [<ffffffff80327789>] sel_netnode_free+0xd/0xf
>   [<ffffffff80268932>] __rcu_process_callbacks+0x147/0x1b6
>   [<ffffffff802689c4>] rcu_process_callbacks+0x23/0x44
>   [<ffffffff8023cc04>] __do_softirq+0x58/0xae
>   [<ffffffff8020d1cc>] call_softirq+0x1c/0x28
>   [<ffffffff8020ed5c>] do_softirq+0x2f/0x6f
>   [<ffffffff8023c72e>] irq_exit+0x36/0x38
>   [<ffffffff8021dedc>] smp_apic_timer_interrupt+0x74/0x81
>   [<ffffffff8020cc76>] apic_timer_interrupt+0x66/0x70
>   <EOI>  [<ffffffff8020a2e1>] ? mwait_idle+0x38/0x42
>   [<ffffffff8020a2a9>] ? mwait_idle+0x0/0x42
>   [<ffffffff8020b2ff>] ? cpu_idle+0xcb/0xe0
>   [<ffffffff804eaefe>] ? start_secondary+0xb2/0xb4
>
>
>  Code: 3a 48 69 c0 80 0e 00 00 48 03 04 d5 00 35 92 80 c9 c3 55 48 89 e5 53 e8 87 ff ff ff 48 89 c7 48 89 c3 e8 69 ff ff ff 85 c0 75 04 <0f> 0b eb fe 48 8b 43 30 5b c9 c3 55 48 89 e5 e8 87 ff ff ff 48
>  RIP  [<ffffffff8028fea8>] page_get_cache+0x19/0x24
>   RSP <ffff81025f22fe88>
>
>  security/selinux/netnode.c looks to be doing simple old kzalloc/kfree, so
>  I'd be suspecting slab.  But there are significant changes netnode.c in
>  git-selinux.

Andrew, you don't seem to have slab debugging enabled:

# CONFIG_DEBUG_SLAB is not set

And quite frankly, the oops looks unlikely to be a slab bug but rather
a plain old slab corruption cause by the callers...

                                    Pekka
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