linux-image-5.7.0-1-amd64: Oops on kernel (NULL pointer dereference) after NFS is mounted on client

[Robin Gutöhrlein <Robin.Gutoehrlein@gmx.de>]

Hello,

my server (Debian bullseye) is crashing after i mount a nfs (with
kerberos) share on a client machine (same debian). I have no idea how
to file the bug (and where it belongs). I can't use the reportbug tool
since I do not have a MTA configured.


BUG: kernel NULL pointer dereference, adress: 000000000000000010
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) -not-present page
PGD0 P4D 0
Oops: 0000 [#1] SMP PTI
...
RIP: 0010:__cgroup_bfp_run_filter_skb+0x26b/0x3d0
...
Call Trace:
  ip_finish_output
  ip_output
  ? __ip_finish_output
  __ip_queue_xmit
  ? __switch_to_asm
  ? __switch_to_asm
  ? __switch_to_asm
  __tcp_transmit_skb
  tcp_write_xmit
  __tcp_push_pending_frames
  inet_shutdown
  svc_delete_xprt
  svc_close_net
  svc_shutdown_net
  nfsd_destroy
  nfsd
  kthread
  ? nfsd_destroy
  ?  kthread_park
  ret_from_fork

Sincerly
Robin