On 03/03/17 17:15, Mason wrote: [...] >>> [ 1.264893] Unable to handle kernel paging request at virtual address d08664f4 Note that that's a reasonable approximation of a vmalloc address... >>> [ 1.272248] pgd = c0004000 >>> [ 1.275060] [d08664f4] *pgd=8f804811, *pte=00000000, *ppte=00000000 >>> [ 1.281476] Internal error: Oops: 7 [#1] PREEMPT SMP ARM >>> [ 1.286897] Modules linked in: >>> [ 1.290053] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.9.7-1-rc2 #151 >>> [ 1.296696] Hardware name: Sigma Tango DT >>> [ 1.300808] task: cf82c9c0 task.stack: cf838000 >>> [ 1.305446] PC is at quirk_usb_early_handoff+0x3e8/0x790 >>> [ 1.310873] LR is at ioremap_page_range+0xf8/0x1a8 >>> [ 1.315771] pc : [<c039fe8c>] lr : [<c02d0a10>] psr: 000e0013 >>> [ 1.315771] sp : cf839d78 ip : 00000000 fp : cf839e38 >>> [ 1.327482] r10: c10248a0 r9 : 00000000 r8 : d08664f4 >>> [ 1.332816] r7 : d084e000 r6 : 00002000 r5 : 000c0300 r4 : cfb5f800 >>> [ 1.339460] r3 : 000184f4 r2 : 00000000 r1 : 91001e13 r0 : d084e000 ...and that specifically it's r0 + r3... [...] >> [ 1.258926] Unable to handle kernel paging request at virtual address d0863f70 >> [ 1.266284] pgd = c0004000 >> [ 1.269097] [d0863f70] *pgd=8f804811, *pte=00000000, *ppte=00000000 >> [ 1.275512] Internal error: Oops: 7 [#1] PREEMPT SMP ARM >> [ 1.280933] Modules linked in: >> [ 1.284089] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.9.7-1-rc2 #157 >> [ 1.290732] Hardware name: Sigma Tango DT >> [ 1.294843] task: cf82c9c0 task.stack: cf838000 >> [ 1.299482] PC is at quirk_usb_early_handoff+0x3e8/0x790 >> [ 1.304907] LR is at ioremap_page_range+0xf8/0x1a8 >> [ 1.309806] pc : [<c039fe44>] lr : [<c02d0a10>] psr: 000e0013 >> [ 1.309806] sp : cf839d78 ip : 00000000 fp : cf839e38 >> [ 1.321517] r10: c10248a0 r9 : 00000000 r8 : d0863f70 >> [ 1.326851] r7 : d084e000 r6 : 00002000 r5 : 000c0300 r4 : cfb52800 >> [ 1.333495] r3 : 00015f70 r2 : 00000000 r1 : 91001e13 r0 : d084e000 ...and again... [...] > [ 1.261813] Unable to handle kernel paging request at virtual address d08611e4 > [ 1.269167] pgd = c0004000 > [ 1.271979] [d08611e4] *pgd=8f804811, *pte=00000000, *ppte=00000000 > [ 1.278394] Internal error: Oops: 7 [#1] PREEMPT SMP ARM > [ 1.283815] Modules linked in: > [ 1.286970] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.9.7-1-rc2 #157 > [ 1.293614] Hardware name: Sigma Tango DT > [ 1.297726] task: cf82c9c0 task.stack: cf838000 > [ 1.302364] PC is at quirk_usb_early_handoff+0x3e8/0x790 > [ 1.307790] LR is at ioremap_page_range+0xf8/0x1a8 > [ 1.312688] pc : [<c039fe44>] lr : [<c02d0a10>] psr: 000e0013 > [ 1.312688] sp : cf839d78 ip : 00000000 fp : cf839e38 > [ 1.324399] r10: c10248a0 r9 : 00000000 r8 : d08611e4 > [ 1.329733] r7 : d084e000 r6 : 00002000 r5 : 000c0300 r4 : cfb4e800 > [ 1.336377] r3 : 000131e4 r2 : 00000000 r1 : 91001e13 r0 : d084e000 ...and again. And always at the same PC, too. Looking at quirk_usb_early_handoff(), it mostly seems to go off poking bridge resources, so I'd hazard a guess that it's down to your host driver, with something uninitialised (or already freed) being used as an offset into some ioremapped resource (which given the consistency of r0 is probably allocated pretty early on). "addr2line -i -e vmlinux c039fe44", and work backwards from there ;) In particular I'd follow the provenance of r3. Robin. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
