[Intel-wired-lan] [REGRESSION] Deadlock since commit 6faee3d4ee8b ("igb: Add lock to avoid data race")

[Paul Menzel]

[Add Corinna back to Cc:, who was removed by Mozilla Thunderbird because 
Reply-To header was set for some reason in the original report.]

Am 07.03.23 um 11:12 schrieb Paul Menzel:
> [Adding regressions at lists.linux.dev]
> 
> #regzbot ^introduced: 6faee3d4ee8b
> 
> Am 07.03.23 um 10:54 schrieb Corinna Vinschen:
>> Hi,
>>
>>
>> After patch 6faee3d4ee8b ("igb: Add lock to avoid data race"), we see
>> a deadlock scenario when trying to unload the igb module.
>>
>> The reproducer is pretty simple:
>>
>>    # echo 2 > /sys/class/net/ens5f2/device/sriov_numvfs
>>    # modprobe -r igb
>>
>> The hang is quite thorough, I assume it's suffering a deadlock between
>> the rtnl_lock and the spinlock introduced by 6faee3d4ee8b.
>>
>> Any chance you could have a look?
>>
>>
>> Thanks,
>> Corinna