Re: [REGRESSION] module BTF validation failure (Error -22) on next

[Laura Nao]

On 11/15/24 18:17, Laura Nao wrote:
> I managed to reproduce the issue locally and I've uploaded the vmlinux[1]
> (stripped of DWARF data) and vmlinux.raw[2] files, as well as one of the
> modules[3] and its btf data[4] extracted with:
> 
> bpftool -B vmlinux btf dump file cros_kbd_led_backlight.ko > cros_kbd_led_backlight.ko.raw
> 
> Looking again at the logs[5], I've noticed the following is reported:
> 
> [    0.415885] BPF: 	 type_id=115803 offset=177920 size=1152
> [    0.416029] BPF:
> [    0.416083] BPF: Invalid offset
> [    0.416165] BPF:
> 
> There are two different definitions of rcu_data in '.data..percpu', one
> is a struct and the other is an integer:
> 
> type_id=115801 offset=177920 size=1152 (VAR 'rcu_data')
> type_id=115803 offset=177920 size=1152 (VAR 'rcu_data')
> 
> [115801] VAR 'rcu_data' type_id=115572, linkage=static
> [115803] VAR 'rcu_data' type_id=1, linkage=static
> 
> [115572] STRUCT 'rcu_data' size=1152 vlen=69
> [1] INT 'long unsigned int' size=8 bits_offset=0 nr_bits=64 encoding=(none)
> 
> I assume that's not expected, correct?
> 
> I'll dig a bit deeper and report back if I can find anything else.

I ran a bisection, and it appears the culprit commit is:
https://lore.kernel.org/all/20241021080856.48746-2-ubizjak@xxxxxxxxx/

Hi Uros, do you have any suggestions or insights on resolving this issue?

This problem is now impacting mainline as well. The full context can be 
found at the beginning of this thread[1].

Thanks,

Laura

[1] https://lore.kernel.org/all/20241106160820.259829-1-laura.nao@xxxxxxxxxxxxx/

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