rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=c3d4/1/0x4000000000000000 softirq=164758/164759 fqs=5006
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   794230          0            0
rcu: 	cputime:     4353      48136           63   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=119969 q=11841 ncpus=2)
CPU: 1 UID: 0 PID: 29708 Comm: syz.7.6312 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:its_return_thunk+0x0/0x10
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <c3> cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e9 1b 89 81 f5 cc
RSP: 0018:ffffc90000a07b58 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff933d80d0 RCX: 0000000000000304
RDX: 0000000000000004 RSI: ffffffff8c2a8d60 RDI: ffffffff8c2a8d20
RBP: 1ffffffff218b601 R08: ffffc90000a07d70 R09: 0000000000000000
R10: ffffc90000a07d38 R11: fffff52000140fa9 R12: ffffffff8e959ba0
R13: ffffffff8176b21f R14: ffffffff8e959ba0 R15: ffffffff8176b21f
FS:  00007f36b03ee6c0(0000) GS:ffff8882a9251000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e17ca23bf8 CR3: 000000010773e000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_is_watching+0x15/0xb0
 lock_release+0x4b/0x3c0
 unwind_next_frame+0x1baa/0x2550
 __unwind_start+0x514/0x660
 arch_stack_walk+0xe3/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0xee/0x8b0
 skb_release_head_state+0x71/0x360
 __kfree_skb+0x24/0x210
 ip_tunnel_xmit+0xaf2/0x2040
 __gre_xmit+0x19e/0x240
 erspan_xmit+0xad5/0x1590
 dev_hard_start_xmit+0x2cd/0x830
 sch_direct_xmit+0x257/0x4c0
 __dev_queue_xmit+0x1754/0x37f0
 ip6_output+0x337/0x540
 ndisc_send_skb+0xcb2/0x1650
 addrconf_rs_timer+0x2d2/0x6c0
 call_timer_fn+0x192/0x5e0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x225/0x840
 __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:preempt_schedule_irq+0x48/0xa0
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 43 e2 e3 f5 e8 6e b2 1e f6 fb bf 01 00 00 00 <e8> d3 a2 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 34 b4 1e f6 bf 01
RSP: 0018:ffffc90008606f48 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8c2a8d60 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff9031b4f7 R09: 1ffffffff206369e
R10: dffffc0000000000 R11: fffffbfff206369f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
 irqentry_exit+0x14f/0x8f0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:should_fail_ex+0x44/0x560
Code: fb 49 bc 00 00 00 00 00 fc ff df 65 8b 05 74 a0 4a 0e a9 00 01 ff 00 0f 84 ed 00 00 00 49 89 dd 49 c1 ed 03 43 80 7c 25 00 00 <74> 08 48 89 df e8 72 61 41 fd 48 83 3b 00 0f 84 16 01 00 00 4c 8d
RSP: 0018:ffffc90008607060 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8eaa27e0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8eaa27e0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc90008607160 R11: fffff520010c0e31 R12: dffffc0000000000
R13: 1ffffffff1d544fc R14: 0000000000000001 R15: ffff888167c816c4
 prepare_alloc_pages+0x230/0x650
 __alloc_frozen_pages_noprof+0x12f/0x380
 alloc_pages_mpol+0x212/0x380
 alloc_pages_noprof+0xac/0x2a0
 pte_alloc_one+0x22/0x370
 __pte_alloc+0x25/0x1a0
 copy_pmd_range+0x5029/0x5880
 copy_page_range+0xc26/0x1250
 dup_mmap+0xf21/0x1d90
 copy_mm+0x11a/0x480
 copy_process+0x1e4a/0x42e0
 kernel_clone+0x2d7/0x940
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f36af59ce59
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:00007f36b03edfd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f36af815fa0 RCX: 00007f36af59ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000001000
RBP: 00007f36af632e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f36af816038 R14: 00007f36af815fa0 R15: 00007ffc09ed9058
 </TASK>
sched: DL replenish lagged too much
