rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11422/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=31685, q=777 ncpus=2)
task:kworker/1:20    state:R  running task     stack:27032 pid:11422 tgid:11422 ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x597/0x620
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:seqcount_lockdep_reader_access+0xed/0x100
Code: 00 75 11 e8 05 d6 26 f8 4d 85 f6 75 16 e8 fb d5 26 f8 eb 15 e8 f4 d5 26 f8 e8 1f 0d dd 01 4d 85 f6 74 ea e8 e5 d5 26 f8 fb 5b <41> 5e e9 0c ee df 01 cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90
RSP: 0018:ffffc900046d7910 EFLAGS: 00000293
RAX: ffffffff899bc20b RBX: 0000000000000001 RCX: ffff8881abcdba80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900046d7a70 R08: ffffffff8fced877 R09: 1ffffffff1f9db0e
R10: dffffc0000000000 R11: fffffbfff1f9db0f R12: dffffc0000000000
R13: ffff888174bf4818 R14: 0000000000000200 R15: 000000000001408c
 gc_worker+0x304/0x1290
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
