On Wed, Jul 10, 2013 at 2:40 PM, Benjamin Herrenschmidt <b...@kernel.crashing.org> wrote: > Did you get any traces that show the flow that happens around a case of > corruption ?
Well, I captured a lot of data, both logging kernel output and capturing PCI traffic. I've put the full console log output on pastebin at http://pastebin.com/ZFYbneNR The initial corruption is a starting address of 0xe94f17f8. Looking at the dumped data: Slab corruption: fib6_nodes start=e94f17f8, len=32 Redzone: 0x9f911029d74e35b/0xd4bed90f1c6f0806. Last user: [<06040001>](0x6040001) 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b ff ff ff ff ff ff Prev obj: start=e94f17c0, len=32 Redzone: 0x9f911029d74e35b/0x9f911029d74e35b. Last user: [< (null)>](0x0) 000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 Next obj: start=e94f1830, len=32 Redzone: 0xd4bed90f1c6f0aca/0xafba11029d74e35b. Last user: [< (null)>](0x0) 000: 0d 5b 00 00 00 00 00 00 0a ca 0d 01 00 00 00 00 010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 bd 3e The first corrupted byte is at address 0xe94f1802. Looking at the dump of all the DMA mappings this range is never mapped. Nor is there a single PCI write to this mapped address either. However, I did find some correlation to a PCI write to a near address. From the PCI capture: Command | Address | Data | /BE Mem Wr | 294F1810 | | | | FFFF0000 | 0011 | | FFFFFFFF | 0000 | | 0FD9BED4 | 0000 | | 06086F1C | 0000 | | 00080100 | 0000 | | 01000406 | 0000 | | 0FD9BED4 | 0000 | | CA0A6F1C | 0000 | | 00005B0D | 0000 | | 00000000 | 0000 | | 010DCA0A | 0000 | | 00000000 | 0000 | | 00000000 | 0000 | | 00000000 | 0000 | | 00000000 | 0000 | | 3EBD0000 | 1100 The data in this write looks very much like the pattern in the detected slab corruption. Looking at the PCI trace, it doesn't appear to be the incoming PCI data (unless the PCI Inbound Address Translation registers are misconfigured). Yet clearly these are corrupted with ethernet traffic. Thanks, Pete _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
