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Date: Thu, 1 Dec 2011 09:44:37 +0100 From: Markus Trippelsdorf <markus@...ppelsdorf.de> To: Christoph Lameter <cl@...ux.com> Cc: Eric Dumazet <eric.dumazet@...il.com>, "Alex,Shi" <alex.shi@...el.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, Pekka Enberg <penberg@...nel.org>, Matt Mackall <mpm@...enic.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, tj@...nel.org, dri-devel@...ts.freedesktop.org, Alex Deucher <alexander.deucher@....com>, Dave Airlie <airlied@...hat.com> Subject: Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413 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 -- Markus -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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