rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10520 ticks this GP) idle=b034/1/0x4000000000000000 softirq=31534/31536 fqs=5192
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1243777          0            0
rcu: 	cputime:    35107      17381           36   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=27181 q=2241 ncpus=2)
CPU: 1 UID: 0 PID: 9512 Comm: syz.6.889 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> 98 3b 1b 0a cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000a085f0 EFLAGS: 00000246
RAX: ffffc9000886f7a0 RBX: ffffffff8b8f7238 RCX: 1ffff92000141001
RDX: ffffffff907cad6c RSI: 0000000000000003 RDI: ffffc9000886f790
RBP: dffffc0000000000 R08: 0000000000000018 R09: ffffffff8e560120
R10: ffffc90000a08718 R11: ffffffff81af6830 R12: ffffc90000a08710
R13: ffffc90000a086d0 R14: ffffc90000a086c8 R15: ffffc9000886f6f8
FS:  00007f2d8ef8f6c0(0000) GS:ffff8882a96a4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000254000 CR3: 000000016fb6a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x1082/0x23c0
 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+0x1d0/0x7d0
 ndisc_alloc_skb+0x9f/0x480
 ndisc_send_rs+0x2b5/0x630
 addrconf_rs_timer+0x395/0x6d0
 call_timer_fn+0x192/0x640
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 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 93 90 03 f6 e8 ae 23 3c f6 fb bf 01 00 00 00 <e8> 23 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 84 25 3c f6 bf 01
RSP: 0018:ffffc9000886f7a0 EFLAGS: 00000206
RAX: 0000000000002c4d RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8dcf1f4e RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff8ff0e0b7 R09: 1ffffffff1fe1c16
R10: dffffc0000000000 R11: fffffbfff1fe1c17 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
 irqentry_exit+0x599/0x620
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:generic_permission+0x0/0x690
Code: 80 e1 07 80 c1 03 38 c1 7c b9 4c 89 f7 e8 78 03 eb ff eb af 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 30 41 89 d4 49
RSP: 0018:ffffc9000886f8c8 EFLAGS: 00000283
RAX: ffffffff82415183 RBX: 1ffff1102dddb030 RCX: 0000000000080000
RDX: 0000000000000022 RSI: ffff88816eed8180 RDI: ffffffff8e6e7180
RBP: 0000000000000001 R08: ffff88810afd3a00 R09: 0000000000000007
R10: 000000000000000b R11: 0000000000000002 R12: ffff88816eed8182
R13: ffff8881016cc790 R14: ffff88816eed8180 R15: 0000000000000022
 inode_permission+0x243/0x5f0
 may_open+0x325/0x4c0
 path_openat+0x2d50/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2d8e19acb9
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:00007f2d8ef8f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f2d8e415fa0 RCX: 00007f2d8e19acb9
RDX: 00000000001c1341 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f2d8e208bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2d8e416038 R14: 00007f2d8e415fa0 R15: 00007ffe5d7d7978
 </TASK>
sched: DL replenish lagged too much
