rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10498 ticks this GP) idle=40cc/1/0x4000000000000000 softirq=13247/13311 fqs=5124
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   927792        159            0
rcu: 	cputime:     6772      45715           52   ==> 52490(ms)
rcu: 	(t=10502 jiffies g=10357 q=6721 ncpus=2)
CPU: 0 UID: 0 PID: 5962 Comm: syz.1.71 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__read_once_word_nocheck+0x3/0x10
Code: 00 48 ba 00 00 00 00 00 fc ff df e9 88 fc ff ff 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 07 <e9> 48 c5 35 0a cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000007150 EFLAGS: 00000202
RAX: ffffffff81aecc3c RBX: ffffc90007667e98 RCX: 1ffff92000000e01
RDX: ffffffff90c3b1f4 RSI: 0000000000000002 RDI: ffffc90007667e98
RBP: 1ffff92000000e46 R08: 0000000000000001 R09: ffffffff8e95cd60
R10: ffffc90000007278 R11: ffffffff81b0f6a0 R12: ffffc90007668000
R13: 1ffff92000000e47 R14: ffffc90000007228 R15: ffffc90007660000
FS:  00007f0a1c3816c0(0000) GS:ffff88818dc84000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f91d141d866 CR3: 0000000114db6000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0xed7/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 skb_release_data+0x828/0xa60
 __kfree_skb+0x5d/0x210
 nft_do_chain+0x18e5/0x1ae0
 nft_do_chain_inet+0x360/0x4b0
 nf_hook_slow+0xc5/0x220
 NF_HOOK+0x21f/0x3c0
 process_backlog+0x7dd/0x1950
 __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:_raw_spin_unlock_irq+0x29/0x50
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ba 4c f5 f5 48 89 df e8 c2 c1 f5 f5 e8 7d 57 21 f6 fb bf 01 00 00 00 <e8> b2 42 e7 f5 65 8b 05 9b 1f 8d 07 85 c0 74 07 5b e9 01 48 00 00
RSP: 0018:ffffc90007667af0 EFLAGS: 00000206
RAX: 00000000000c6fb7 RBX: ffff88810ff6df00 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8dfabd2a RDI: 0000000000000001
RBP: ffffc90007667c30 R08: ffffffff9030c1f7 R09: 1ffffffff206183e
R10: dffffc0000000000 R11: fffffbfff206183f R12: dffffc0000000000
R13: ffff888110bd3cb0 R14: 0000000000000000 R15: 0000000000000001
 do_exit+0x2f6/0x22c0
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x840
 exit_to_user_mode_loop+0x8c/0x4d0
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0a1b59cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0a1c381028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: 0000000000000028 RBX: 00007f0a1b816090 RCX: 00007f0a1b59cdd9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000003c0
RBP: 00007f0a1b632d69 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0a1b816128 R14: 00007f0a1b816090 R15: 00007ffc66d07b68
 </TASK>
sched: DL replenish lagged too much
