GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=101481, q=537 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295004623-4294994121), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g101481 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=30250
rcu: rcu_preempt kthread starved for 10502 jiffies! g101481 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R stack:27480 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__lock_acquire+0xa3d/0x2cf0
Code: 0d 03 85 c0 74 1c 83 3d 84 2b 8f 0e 00 75 13 48 8d 3d 07 57 92 0e 48 c7 c6 4f 65 0c 8e 67 48 0f b9 3a 90 31 c0 48 83 78 40 00 <0f> 84 5f 1d 00 00 41 8b 45 20 25 ff 1f 00 00 48 0f a3 05 8c 54 9f
RSP: 0018:ffffc90000006e80 EFLAGS: 00000086
RAX: ffffffff93e218e8 RBX: 00000000948173bd RCX: 0000000004170efd
RDX: 000000001b17e7cf RSI: 00000000482bfd08 RDI: ffff888102ae9d80
RBP: 73a7f00300000000 R08: ffffffff89b8a7e4 R09: ffff88810bf4b2c0
R10: dffffc0000000000 R11: ffffffff89b8a730 R12: ffff888102aea938
R13: ffff888102aea938 R14: ffff888102ae9d80 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818dc8c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe7ec15cd90 CR3: 000000010ee8a000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_acquire+0x106/0x350
 _raw_spin_lock+0x2e/0x40
 advance_sched+0xb4/0xc20
 __hrtimer_run_queues+0x3c0/0xa20
 hrtimer_interrupt+0x44b/0x950
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:deref_stack_reg+0x27/0x230
Code: 90 90 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 20 48 89 54 24 18 49 89 f0 49 89 ff 48 be 00 00 00 00 00 fc ff df 48 8d 5f 08 <49> 89 dc 49 c1 ec 03 41 80 3c 34 00 4c 89 04 24 74 16 48 89 df e8
RSP: 0018:ffffc90000007420 EFLAGS: 00000282
RAX: fffffffffffffff0 RBX: ffffc90000007550 RCX: 0000000000000000
RDX: ffffc90000007588 RSI: dffffc0000000000 RDI: ffffc90000007548
RBP: dffffc0000000000 R08: ffffc90000007950 R09: 0000000000000000
R10: ffffc90000007598 R11: fffff52000000eb5 R12: ffffc90000007950
R13: 1ffff92000000eab R14: ffffc90000007548 R15: ffffc90000007548
 unwind_next_frame+0x19d5/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_mempool_poison_object+0x178/0x1e0
 napi_skb_cache_put+0x7b/0x6f0
 gro_receive_skb+0x58e/0xce0
 e1000_clean_rx_irq+0x980/0x11a0
 e1000_clean+0xe8f/0x2a90
 __napi_poll+0xae/0x340
 net_rx_action+0x627/0xf70
 handle_softirqs+0x22a/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch+0x427/0xbe0
Code: 41 c7 84 24 e0 0d 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 e6 a9 16 0a e8 a1 f7 38 00 fb 49 8d bd b0 16 00 00 <48> 89 f8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 7b 03 00 00 41 80
RSP: 0018:ffffc90000147ab0 EFLAGS: 00000206
RAX: 0000000000505581 RBX: 1ffff11024207784 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8dfaa495 RDI: ffff888102aeb430
RBP: ffffc90000147b10 R08: ffffffff9030b7f7 R09: 1ffffffff20616fe
R10: dffffc0000000000 R11: fffffbfff20616ff R12: ffff88812103ae88
R13: ffff888102ae9d80 R14: ffff888109cfbb00 R15: dffffc0000000000
 __schedule+0x1829/0x5740
 schedule+0x164/0x360
 smpboot_thread_fn+0x5bc/0xa50
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
