Kernel panic at "sysfs_readdir"

Issue

System crashed with following kernel panic message:

Unable to handle kernel NULL pointer dereference at 0000000000000030 RIP: 
{sysfs_readdir+333}
PML4 7df88067 PGD de1d9067 PMD 0 
Oops: 0000 [1] SMP 
CPU 3 
[...]
RIP: 0010:[] {sysfs_readdir+333}
[...]
Call Trace:{filldir64+0} {filldir64+0} 
       {vfs_readdir+155} {sys_getdents64+118} 
       {sys_fcntl+834} {system_call+126}