Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413

From: Markus Trippelsdorf
Date: Mon Nov 21 2011 - 11:10:40 EST

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In reply to: Eric Dumazet: "Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413"
Next in thread: Markus Trippelsdorf: "Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413"
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On 2011.11.21 at 16:48 +0100, Eric Dumazet wrote:
> Le lundi 21 novembre 2011 à 16:36 +0100, Markus Trippelsdorf a écrit :
> > On 2011.11.21 at 15:16 +0100, Eric Dumazet wrote:
> > > Le lundi 21 novembre 2011 à 14:15 +0100, Markus Trippelsdorf a écrit :
> > >
> > > > I've enabled CONFIG_SLUB_DEBUG_ON and this is what happend:
> > > >
> > >
> > > Thanks
> > >
> > > Please continue to provide more samples.
> > >
> > > There is something wrong somewhere, but where exactly, its hard to say.
> >
> > New sample. This one points to lib/idr.c:
> >
> > [drm] Initialized drm 1.1.0 20060810
> > [drm] radeon defaulting to kernel modesetting.
> > [drm] radeon kernel modesetting enabled.
> > radeon 0000:01:05.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
> > radeon 0000:01:05.0: setting latency timer to 64
> > [drm] initializing kernel modesetting (RS780 0x1002:0x9614 0x1043:0x834D).
> > [drm] register mmio base: 0xFBEE0000
> > [drm] register mmio size: 65536
> > ATOM BIOS: 113
> > radeon 0000:01:05.0: VRAM: 128M 0x00000000C0000000 - 0x00000000C7FFFFFF (128M used)
> > radeon 0000:01:05.0: GTT: 512M 0x00000000A0000000 - 0x00000000BFFFFFFF
> > [drm] Detected VRAM RAM=128M, BAR=128M
> > [drm] RAM width 32bits DDR
> > [TTM] Zone kernel: Available graphics memory: 4083428 kiB.
> > [TTM] Zone dma32: Available graphics memory: 2097152 kiB.
> > [TTM] Initializing pool allocator.
> > [drm] radeon: 128M of VRAM memory ready
> > [drm] radeon: 512M of GTT memory ready.
> > [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
> > [drm] Driver supports precise vblank timestamp query.
> > [drm] radeon: irq initialized.
> > [drm] GART: num cpu pages 131072, num gpu pages 131072
> > [drm] Loading RS780 Microcode
> > [drm] PCIE GART of 512M enabled (table at 0x00000000C0040000).
> > radeon 0000:01:05.0: WB enabled
> > [drm] ring test succeeded in 1 usecs
> > [drm] radeon: ib pool ready.
> > [drm] ib test succeeded in 0 usecs
> > =============================================================================
> > BUG idr_layer_cache: Poison overwritten
> > -----------------------------------------------------------------------------
>
> Thanks, could you now add "CONFIG_DEBUG_PAGEALLOC=y" in your config as
> well ?

Sure. This one happend with CONFIG_DEBUG_PAGEALLOC=y:

[drm] Initialized radeon 2.11.0 20080528 for 0000:01:05.0 on minor 0
loop: module loaded
ahci 0000:00:11.0: version 3.0
ahci 0000:00:11.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22
ahci 0000:00:11.0: AHCI 0001.0100 32 slots 6 ports 3 Gbps 0x3f impl SATA mode
ahci 0000:00:11.0: flags: 64bit ncq sntf ilck pm led clo pmp pio slum part ccc
scsi0 : ahci
scsi1 : ahci
=============================================================================
BUG task_struct: Poison overwritten
-----------------------------------------------------------------------------

INFO: 0xffff880215c43800-0xffff880215c43803. First byte 0x0 instead of 0x6b
INFO: Allocated in copy_process+0xc4/0xf60 age=168 cpu=1 pid=5
__slab_alloc.constprop.70+0x1a4/0x1e0
kmem_cache_alloc+0x126/0x160
copy_process+0xc4/0xf60
do_fork+0x100/0x2b0
kernel_thread+0x6c/0x70
__call_usermodehelper+0x31/0xa0
process_one_work+0x11a/0x430
worker_thread+0x126/0x2d0
kthread+0x87/0x90
kernel_thread_helper+0x4/0x10
INFO: Freed in free_task+0x3e/0x50 age=156 cpu=2 pid=13
__slab_free+0x33/0x2d0
kmem_cache_free+0x104/0x120
free_task+0x3e/0x50
__put_task_struct+0xb0/0x110
delayed_put_task_struct+0x3b/0xa0
__rcu_process_callbacks+0x12a/0x350
rcu_process_callbacks+0x62/0x140
__do_softirq+0xa8/0x200
run_ksoftirqd+0x107/0x210
kthread+0x87/0x90
kernel_thread_helper+0x4/0x10
INFO: Slab 0xffffea0008571000 objects=17 used=17 fp=0x (null) flags=0x4000000000004080
INFO: Object 0xffff880215c432c0 @offset=12992 fp=0xffff880215c41d00

Bytes b4 ffff880215c432b0: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
Object ffff880215c432c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c432d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c432e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c432f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c43300: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c43310: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
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Object ffff880215c43330: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
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Object ffff880215c436e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
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Object ffff880215c437c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c437d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c437e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c437f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c43800: 00 00 00 00 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b ....kkkkkkkkkkkk
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Object ffff880215c43830: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c43840: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c43850: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c43860: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c43870: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c43880: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c43890: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
Object ffff880215c438a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk.
Redzone ffff880215c438b0: bb bb bb bb bb bb bb bb ........
Padding ffff880215c439f0: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
Pid: 5, comm: kworker/u:0 Not tainted 3.2.0-rc2-00274-g6fe4c6d #72
Call Trace:
[<ffffffff81101ca8>] ? print_section+0x38/0x40
[<ffffffff811021a3>] print_trailer+0xe3/0x150
[<ffffffff811023a0>] check_bytes_and_report+0xe0/0x100
[<ffffffff81103196>] check_object+0x1c6/0x240
[<ffffffff8106b034>] ? copy_process+0xc4/0xf60
[<ffffffff814c5bb3>] alloc_debug_processing+0x62/0xe4
[<ffffffff814c6461>] __slab_alloc.constprop.70+0x1a4/0x1e0
[<ffffffff8106b034>] ? copy_process+0xc4/0xf60
[<ffffffff814ca12a>] ? schedule+0x3a/0x50
[<ffffffff81104d66>] kmem_cache_alloc+0x126/0x160
[<ffffffff8106b034>] ? copy_process+0xc4/0xf60
[<ffffffff81065f18>] ? enqueue_task_fair+0xf8/0x140
[<ffffffff8106b034>] copy_process+0xc4/0xf60
[<ffffffff8106c000>] do_fork+0x100/0x2b0
[<ffffffff810920fd>] ? sched_clock_local+0x1d/0x90
[<ffffffff81044dec>] kernel_thread+0x6c/0x70
[<ffffffff81084430>] ? proc_cap_handler+0x180/0x180
[<ffffffff814cdd30>] ? gs_change+0xb/0xb
[<ffffffff810845a1>] __call_usermodehelper+0x31/0xa0
[<ffffffff810869ba>] process_one_work+0x11a/0x430
[<ffffffff81084570>] ? call_usermodehelper_freeinfo+0x30/0x30
[<ffffffff81087026>] worker_thread+0x126/0x2d0
[<ffffffff81086f00>] ? rescuer_thread+0x1f0/0x1f0
[<ffffffff8108bb87>] kthread+0x87/0x90
[<ffffffff814cdd34>] kernel_thread_helper+0x4/0x10
[<ffffffff8108bb00>] ? kthread_flush_work_fn+0x10/0x10
[<ffffffff814cdd30>] ? gs_change+0xb/0xb
FIX task_struct: Restoring 0xffff880215c43800-0xffff880215c43803=0x6b

FIX task_struct: Marking all objects used
...
debug: unmapping init memory ffffffff8187d000..ffffffff818ea000
Write protecting the kernel read-only data: 8192k
debug: unmapping init memory ffff8800014d1000..ffff880001600000
debug: unmapping init memory ffff8800017e0000..ffff880001800000
...

slabinfo -v gives:

SLUB: task_struct 10 slabs counted but counter=11

--
Markus
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Next message: Steven Rostedt: "Re: [PATCH][RT] tracing: Show padding as unsigned short"
Previous message: Steven Rostedt: "Re: [PATCH 3/3] rcu: Drive configuration directly from SMP andPREEMPT"
In reply to: Eric Dumazet: "Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413"
Next in thread: Markus Trippelsdorf: "Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413"
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