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SubjectRe: Unable to boot linux-next build
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On 09/09/2016 10:31, Quentin Lambert wrote:
> I have been trying to build and boot the last version available on linux-next.
> During the build I am being prompted with "has no CRC!" warnings for a bunch
> of modules.
>
> Has a result I get the following lines in the Module.symvers:
>
> [qlambert@sloth linux-next]$ grep 0x00000 Module.symvers
> 0x00000000 phys_base vmlinux EXPORT_SYMBOL
> 0x00000000 memmove vmlinux EXPORT_SYMBOL
> 0x00000000 __copy_user_nocache vmlinux EXPORT_SYMBOL
> 0x00000000 __get_user_4 vmlinux EXPORT_SYMBOL
> 0x00000000 __put_user_4 vmlinux EXPORT_SYMBOL
> 0x00000000 __memcpy vmlinux EXPORT_SYMBOL
> 0x00000000 __fentry__ vmlinux EXPORT_SYMBOL
> 0x00000000 memset vmlinux EXPORT_SYMBOL
> 0x00000000 __sw_hweight64 vmlinux EXPORT_SYMBOL
> 0x00000000 __sw_hweight32 vmlinux EXPORT_SYMBOL
> 0x00000000 memcpy_mcsafe_unrolled vmlinux EXPORT_SYMBOL_GPL
> 0x00000000 memcpy vmlinux EXPORT_SYMBOL
> 0x00000000 copy_user_enhanced_fast_string vmlinux EXPORT_SYMBOL
> 0x00000000 clear_page vmlinux EXPORT_SYMBOL
> 0x00000000 __put_user_2 vmlinux EXPORT_SYMBOL
> 0x00000000 __get_user_2 vmlinux EXPORT_SYMBOL
> 0x00000000 copy_page vmlinux EXPORT_SYMBOL
> 0x00000000 copy_user_generic_string vmlinux EXPORT_SYMBOL
> 0x00000000 _copy_to_user vmlinux EXPORT_SYMBOL
> 0x00000000 ___preempt_schedule vmlinux EXPORT_SYMBOL
> 0x00000000 __memmove vmlinux EXPORT_SYMBOL
> 0x00000000 empty_zero_page vmlinux EXPORT_SYMBOL
> 0x00000000 __get_user_8 vmlinux EXPORT_SYMBOL
> 0x00000000 __put_user_8 vmlinux EXPORT_SYMBOL
> 0x00000000 _copy_from_user vmlinux EXPORT_SYMBOL
> 0x00000000 native_load_gs_index vmlinux EXPORT_SYMBOL
> 0x00000000 __memset vmlinux EXPORT_SYMBOL
> 0x00000000 ___preempt_schedule_notrace vmlinux EXPORT_SYMBOL
> 0x00000000 __put_user_1 vmlinux EXPORT_SYMBOL
> 0x00000000 __get_user_1 vmlinux EXPORT_SYMBOL
> 0x00000000 copy_user_generic_unrolled vmlinux EXPORT_SYMBOL
>
> If I ignore these and go on to boot the resulting kernel. I am left with:
>
> ERROR: Unable to find root device 'UUID=<omitted>'
>
> I am then dropped to a recovery shell where the keyboard is not answering.
>
> The UUID is valid and is the same being used when I boot the HEAD of the linux
> tree. In fact, I am sending this message from the same machine, running
> that very kernel.
> Prior to failing to find the root device, the kernel prints a series of
> messages for each of the above symbol:
>
> scsi_mod: no symbol version for <foo>
> scsi_mod: Unknown symbol <foo> (err -22)
>
> Therefore, I suspect that the missing CRC messages are linked to the issue.
>
> I have git bisected this behavior to the patch 784d5699edd.
>
> Simply reverting this patch results in different issues.
> The errors I am having due to no CRC are fixed but I receive another error at
> boot time:
> failed command: WRITE LOG DMA EXT
>
> I mostly asking for help as to what to do next.
> Could someone point me toward documentation that would help me understand and
> fix this issue?
I just wanted to add that I tried to compile the kernel on a different
machine and I received
the same warnings and error messages.
They both run Archlinux, so this may be a factor.

Quentin

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