On Thu, 1 Dec 2011, Markus Trippelsdorf wrote:
> On 2011.11.24 at 09:50 +0100, Markus Trippelsdorf wrote:
>> On 2011.11.23 at 10:06 -0600, Christoph Lameter wrote:
>>> On Wed, 23 Nov 2011, Markus Trippelsdorf wrote:
>>>
>>>>> FIX idr_layer_cache: Marking all objects used
>>>>
>>>> Yesterday I couldn't reproduce the issue at all. But today I've hit
>>>> exactly the same spot again. (CCing the drm list)
>>>
>>> Well this is looks like write after free.
>>>
>>>> =============================================================================
>>>> BUG idr_layer_cache: Poison overwritten
>>>> -----------------------------------------------------------------------------
>>>> Object ffff8802156487c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
>>>> kkkkkkkkkkkkkkkk
>>>> Object ffff8802156487d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
>>>> kkkkkkkkkkkkkkkk
>>>> Object ffff8802156487e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
>>>> kkkkkkkkkkkkkkkk
>>>> Object ffff8802156487f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
>>>> kkkkkkkkkkkkkkkk
>>>> Object ffff880215648800: 00 00 00 00 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
>>>> ....kkkkkkkkkkkk
>>>> Object ffff880215648810: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
>>>> kkkkkkkkkkkkkkkk
>>>
>>> And its an integer sized write of 0. If you look at the struct definition
>>> and lookup the offset you should be able to locate the field that
>>> was modified.
>
> It also happens with CONFIG_SLAB.
> (If someone wants to reproduce the issue, just run a kexec boot loop and
> the bug will occur after a few (~10) iterations.)
>
> Dec 1 05:04:52 x4 kernel: [drm] Initialized drm 1.1.0 20060810
> Dec 1 05:04:52 x4 kernel: [drm] radeon defaulting to kernel modesetting.
> Dec 1 05:04:52 x4 kernel: [drm] radeon kernel modesetting enabled.
> Dec 1 05:04:52 x4 kernel: radeon 0000:01:05.0: PCI INT A -> GSI 18 (level,
> low) -> IRQ 18
> Dec 1 05:04:52 x4 kernel: radeon 0000:01:05.0: setting latency timer to 64
> Dec 1 05:04:52 x4 kernel: [drm] initializing kernel modesetting (RS780
> 0x1002:0x9614 0x1043:0x834D).
> Dec 1 05:04:52 x4 kernel: [drm] register mmio base: 0xFBEE0000
> Dec 1 05:04:52 x4 kernel: [drm] register mmio size: 65536
> Dec 1 05:04:52 x4 kernel: ATOM BIOS: 113
> Dec 1 05:04:52 x4 kernel: radeon 0000:01:05.0: VRAM: 128M 0x00000000C0000000
> - 0x00000000C7FFFFFF (128M used)
> Dec 1 05:04:52 x4 kernel: radeon 0000:01:05.0: GTT: 512M 0x00000000A0000000
> - 0x00000000BFFFFFFF
> Dec 1 05:04:52 x4 kernel: [drm] Detected VRAM RAM=128M, BAR=128M
> Dec 1 05:04:52 x4 kernel: [drm] RAM width 32bits DDR
> Dec 1 05:04:52 x4 kernel: [TTM] Zone kernel: Available graphics memory:
> 4090750 kiB.
> Dec 1 05:04:52 x4 kernel: [TTM] Zone dma32: Available graphics memory:
> 2097152 kiB.
> Dec 1 05:04:52 x4 kernel: [TTM] Initializing pool allocator.
> Dec 1 05:04:52 x4 kernel: [drm] radeon: 128M of VRAM memory ready
> Dec 1 05:04:52 x4 kernel: [drm] radeon: 512M of GTT memory ready.
> Dec 1 05:04:52 x4 kernel: [drm] Supports vblank timestamp caching Rev 1
> (10.10.2010).
> Dec 1 05:04:52 x4 kernel: [drm] Driver supports precise vblank timestamp
> query.
> Dec 1 05:04:52 x4 kernel: [drm] radeon: irq initialized.
> Dec 1 05:04:52 x4 kernel: [drm] GART: num cpu pages 131072, num gpu pages
> 131072
> Dec 1 05:04:52 x4 kernel: [drm] Loading RS780 Microcode
> Dec 1 05:04:52 x4 kernel: [drm] PCIE GART of 512M enabled (table at
> 0x00000000C0040000).
> Dec 1 05:04:52 x4 kernel: radeon 0000:01:05.0: WB enabled
> Dec 1 05:04:52 x4 kernel: Slab corruption: size-1024 start=ffff880216cbc730,
> len=1024
> Dec 1 05:04:52 x4 kernel: Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
> Dec 1 05:04:52 x4 kernel: Last user: [< (null)>](0x0)
> Dec 1 05:04:52 x4 kernel: 0d0: 00 00 00 00 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
> 6b ....kkkkkkkkkkkk
> Dec 1 05:04:52 x4 kernel: Prev obj: start=ffff880216cbc318, len=1024
> Dec 1 05:04:52 x4 kernel: Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
> Dec 1 05:04:52 x4 kernel: Last user: [< (null)>](0x0)
> Dec 1 05:04:52 x4 kernel: 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
> 6b kkkkkkkkkkkkkkkk
> Dec 1 05:04:52 x4 kernel: 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
> 6b kkkkkkkkkkkkkkkk
> Dec 1 05:04:52 x4 kernel: Next obj: start=ffff880216cbcb48, len=1024
> Dec 1 05:04:52 x4 kernel: Redzone: 0xd84156c5635688c0/0xd84156c5635688c0.
> Dec 1 05:04:52 x4 kernel: Last user:
> [<ffffffff81299874>](radeon_bo_create+0xb4/0x240)
> Dec 1 05:04:52 x4 kernel: 000: 48 cb cb 16 02 88 ff ff 48 cb cb 16 02 88 ff
> ff H.......H.......
> Dec 1 05:04:52 x4 kernel: 010: 02 00 27 00 00 00 00 00 00 00 00 00 00 00 00
> 00 ..'.............
> Dec 1 05:04:52 x4 kernel: [drm] ring test succeeded in 0 usecs
> Dec 1 05:04:52 x4 kernel: [drm] radeon: ib pool ready.
> Dec 1 05:04:52 x4 kernel: [drm] ib test succeeded in 0 usecs
> Dec 1 05:04:52 x4 kernel: [drm] Radeon Display Connectors
> Dec 1 05:04:52 x4 kernel: [drm] Connector 0:
> Dec 1 05:04:52 x4 kernel: [drm] VGA
> Dec 1 05:04:52 x4 kernel: [drm] DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48
> 0x7e48 0x7e4c 0x7e4c
> Dec 1 05:04:52 x4 kernel: [drm] Encoders:
> Dec 1 05:04:52 x4 kernel: [drm] CRT1: INTERNAL_KLDSCP_DAC1
> Dec 1 05:04:52 x4 kernel: [drm] Connector 1:
> Dec 1 05:04:52 x4 kernel: [drm] DVI-D
> Dec 1 05:04:52 x4 kernel: [drm] HPD3
> Dec 1 05:04:52 x4 kernel: [drm] DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58
> 0x7e58 0x7e5c 0x7e5c
> Dec 1 05:04:52 x4 kernel: [drm] Encoders:
> Dec 1 05:04:52 x4 kernel: [drm] DFP3: INTERNAL_KLDSCP_LVTMA
> Dec 1 05:04:52 x4 kernel: [drm] radeon: power management initialized
> Dec 1 05:04:52 x4 kernel: [drm] fb mappable at 0xF0142000
> Dec 1 05:04:52 x4 kernel: [drm] vram apper at 0xF0000000
> Dec 1 05:04:52 x4 kernel: [drm] size 7299072
> Dec 1 05:04:52 x4 kernel: [drm] fb depth is 24
> Dec 1 05:04:52 x4 kernel: [drm] pitch is 6912
> Dec 1 05:04:52 x4 kernel: fbcon: radeondrmfb (fb0) is primary device
> Dec 1 05:04:52 x4 kernel: Console: switching to colour frame buffer device
> 131x105
> Dec 1 05:04:52 x4 kernel: fb0: radeondrmfb frame buffer device
> Dec 1 05:04:52 x4 kernel: drm: registered panic notifier
> Dec 1 05:04:52 x4 kernel: [drm] Initialized radeon 2.12.0 20080528 for
> 0000:01:05.0 on minor 0
>
>
> Dec 1 05:09:35 x4 kernel: radeon 0000:01:05.0: WB enabled
> Dec 1 05:09:35 x4 kernel: [drm] ring test succeeded in 1 usecs
> Dec 1 05:09:35 x4 kernel: [drm] radeon: ib pool ready.
> Dec 1 05:09:35 x4 kernel: [drm] ib test succeeded in 0 usecs
> Dec 1 05:09:35 x4 kernel: Slab corruption: size-512 start=ffff880216f7e760,
> len=512
> Dec 1 05:09:35 x4 kernel: Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
> Dec 1 05:09:35 x4 kernel: Last user: [< (null)>](0x0)
> Dec 1 05:09:35 x4 kernel: 0a0: 00 00 00 00 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
> 6b ....kkkkkkkkkkkk
> Dec 1 05:09:35 x4 kernel: Prev obj: start=ffff880216f7e548, len=512
> Dec 1 05:09:35 x4 kernel: Redzone: 0x9f911029d74e35b/0x9f911029d74e35b.
> Dec 1 05:09:35 x4 kernel: Last user: [< (null)>](0x0)
> Dec 1 05:09:35 x4 kernel: 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
> 6b kkkkkkkkkkkkkkkk
> Dec 1 05:09:35 x4 kernel: 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
> 6b kkkkkkkkkkkkkkkk
> Dec 1 05:09:35 x4 kernel: Next obj: start=ffff880216f7e978, len=512
> Dec 1 05:09:35 x4 kernel: Redzone: 0xd84156c5635688c0/0xd84156c5635688c0.
> Dec 1 05:09:35 x4 kernel: Last user:
> [<ffffffff812e519d>](radeon_add_atom_encoder+0x7d/0x280)
> Dec 1 05:09:35 x4 kernel: 000: f8 d3 f6 16 02 88 ff ff 18 d8 f6 16 02 88 ff
> ff ................
> Dec 1 05:09:35 x4 kernel: 010: 18 d8 f6 16 02 88 ff ff 0c 00 00 00 e0 e0 e0
> e0 ................
> Dec 1 05:09:35 x4 kernel: [drm] Radeon Display Connectors
> Dec 1 05:09:35 x4 kernel: [drm] Connector 0:
> Dec 1 05:09:35 x4 kernel: [drm] VGA
> Dec 1 05:09:35 x4 kernel: [drm] DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48
> 0x7e48 0x7e4c 0x7e4c
> Dec 1 05:09:35 x4 kernel: [drm] Encoders:
> Dec 1 05:09:35 x4 kernel: [drm] CRT1: INTERNAL_KLDSCP_DAC1
> Dec 1 05:09:35 x4 kernel: [drm] Connector 1:
> Dec 1 05:09:35 x4 kernel: [drm] DVI-D
> Dec 1 05:09:35 x4 kernel: [drm] HPD3
> Dec 1 05:09:35 x4 kernel: [drm] DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58
> 0x7e58 0x7e5c 0x7e5c
> Dec 1 05:09:35 x4 kernel: [drm] Encoders:
> Dec 1 05:09:35 x4 kernel: [drm] DFP3: INTERNAL_KLDSCP_LVTMA
> Dec 1 05:09:35 x4 kernel: [drm] radeon: power management initialized
> Dec 1 05:09:35 x4 kernel: [drm] fb mappable at 0xF0142000
> Dec 1 05:09:35 x4 kernel: [drm] vram apper at 0xF0000000
> Dec 1 05:09:35 x4 kernel: [drm] size 7299072
> Dec 1 05:09:35 x4 kernel: [drm] fb depth is 24
> Dec 1 05:09:35 x4 kernel: [drm] pitch is 6912
> Dec 1 05:09:35 x4 kernel: fbcon: radeondrmfb (fb0) is primary device
> Dec 1 05:09:35 x4 kernel: Console: switching to colour frame buffer device
> 131x105
> Dec 1 05:09:35 x4 kernel: fb0: radeondrmfb frame buffer device
> Dec 1 05:09:35 x4 kernel: drm: registered panic notifier
> Dec 1 05:09:35 x4 kernel: [drm] Initialized radeon 2.12.0 20080528 for
> 0000:01:05.0 on minor 0
The SLAB debugging output points to DRM and more specifically to the
radeon driver.
Dave, Alex, could you please take a look at this or fix up the CC to
include the right people?
Pekka
