rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10043 ticks this GP) idle=ead4/1/0x4000000000000000 softirq=40483/40484 fqs=4363
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1293779          4            0
rcu: 	cputime:     8599      43880           36   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=34133 q=6816 ncpus=2)
CPU: 0 UID: 0 PID: 8282 Comm: syz.2.298 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:unwind_next_frame+0x13a/0x2550
Code: 89 5c 24 70 49 8d 5e 50 48 89 d8 48 c1 e8 03 48 89 44 24 40 80 3c 28 00 74 08 48 89 df e8 be fb b9 00 48 89 5c 24 28 48 8b 1b <48> 85 db 74 23 48 81 c3 88 00 00 00 48 89 d8 48 c1 e8 03 0f b6 04
RSP: 0000:ffffc900000075d8 EFLAGS: 00000246
RAX: 1ffff92000000edf RBX: 0000000000000000 RCX: 0000000000000102
RDX: 0000000001d5b0e6 RSI: ffffffff8c28aa40 RDI: ffffffff8c28aa00
RBP: dffffc0000000000 R08: ffffffff8176e256 R09: ffffffff8e95cd60
R10: dffffc0000000000 R11: ffffffff81b0d880 R12: ffffc900000076e0
R13: 1ffff92000000ed5 R14: ffffc900000076a8 R15: ffffffff8176e256
FS:  00007f8376c1b6c0(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa08237c030 CR3: 00000001ae122000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x384/0x690
 __alloc_skb+0x27d/0x7d0
 ndisc_alloc_skb+0x9f/0x480
 ndisc_send_rs+0x2b5/0x630
 addrconf_rs_timer+0x395/0x6d0
 call_timer_fn+0x192/0x5e0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 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 c6 7a 15 0a e8 41 eb 38 00 fb 49 8d bd a8 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: 0000:ffffc90003be6cb0 EFLAGS: 00000206
RAX: 00000000000e36c9 RBX: 1ffff11024207784 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dfa3a1a RDI: ffff8881132051a8
RBP: ffffc90003be6d10 R08: ffffffff903096f7 R09: 1ffffffff20612de
R10: dffffc0000000000 R11: fffffbfff20612df R12: ffff88812103ae88
R13: ffff888113203b00 R14: ffff88810c791d80 R15: dffffc0000000000
 __schedule+0x17bc/0x5680
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x730
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x221/0x350
Code: ff ff ff e8 e1 14 06 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 cb 2f 97 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 98 4c 92
RSP: 0018:ffffc90003be7078 EFLAGS: 00000286
RAX: 0cbbf8e191400900 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000006ea34900 RSI: ffffffff8e217007 RDI: ffffffff8c28aa60
RBP: ffffffff8222da12 R08: ffffffff8222da12 R09: ffffffff8ea85460
R10: ffffc90003be7180 R11: fffff5200077ce35 R12: 0000000000000000
R13: ffffffff8ea85460 R14: 0000000000000001 R15: 0000000000000246
 fs_reclaim_acquire+0x71/0x100
 prepare_alloc_pages+0x152/0x650
 __alloc_frozen_pages_noprof+0x12f/0x380
 alloc_pages_mpol+0x235/0x490
 alloc_pages_noprof+0xac/0x2a0
 __pmd_alloc+0x3a/0x5c0
 copy_pmd_range+0x5552/0x5970
 copy_page_range+0xbe8/0x11f0
 dup_mmap+0xf40/0x1d90
 copy_mm+0x13b/0x4a0
 copy_process+0x1f1c/0x4450
 kernel_clone+0x284/0x8f0
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8375d9cdd9
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:00007f8376c1afd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f8376015fa0 RCX: 00007f8375d9cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f8375e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8376016038 R14: 00007f8376015fa0 R15: 00007ffccea64398
 </TASK>
sched: DL replenish lagged too much
