Re: BUG: unable to handle kernel NULL pointer dereference in fdb_find_rcu

On 16/12/17 02:37, Andrei Vagin wrote:

Hi,

We run criu tests for linux-next and today we get this bug:

The kernel version is 4.15.0-rc3-next-20171215

[  235.397328] BUG: unable to handle kernel NULL pointer dereference
at 000000000000000c
[  235.398624] IP: fdb_find_rcu+0x3c/0x130

[snip]

Hi,
Thanks for the report, I've missed the changelink before dev creation case when I did
the rhashtable conversion, some of the options do fdb lookups as part of their routine
but we don't have the table initialized yet at that point.
I'll send a fix after some testing.

Thanks,
 Nik