rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=9c24/1/0x4000000000000000 softirq=22578/23431 fqs=4878
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1034705          0            0
rcu: 	cputime:    25361      27118           90   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=14137 q=531 ncpus=2)
CPU: 1 UID: 0 PID: 8130 Comm: syz.2.705 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e-dirty #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:rcu_read_unlock_special+0x87/0x4c0
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 62 2c f8 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900001e0840 EFLAGS: 00000206
RAX: 95050819ff566900 RBX: 1ffff9200003c110 RCX: 95050819ff566900
RDX: 0000000000000002 RSI: ffffffff8d99883e RDI: ffffffff8be29f40
RBP: ffffc900001e0940 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007f1ce26326c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001f4000 CR3: 0000000048d90000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 ipv6_get_ifaddr+0x69c/0x790
 ndisc_send_rs+0x98/0x630
 addrconf_rs_timer+0x369/0x670
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_irq_work+0xa3/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 8b 1d 21 f6 e8 c6 f0 57 f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc90002dcf6a0 EFLAGS: 00000286
RAX: 95050819ff566900 RBX: 0000000000000000 RCX: 95050819ff566900
RDX: 0000000000000006 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc90002dcf740 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920005b9ed4
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:cap_vm_enough_memory+0x5/0x60
Code: f2 e8 ef b0 83 00 e9 47 fd ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 53 <e8> c6 01 4d fd e8 b1 78 fb 06 65 48 8b 1c 25 08 10 a0 92 48 81 c3
RSP: 0018:ffffc90002dcf800 EFLAGS: 00000246
RAX: 1ffffffff1b77fbb RBX: 0000000000000001 RCX: 0000000000000002
RDX: ffff888106743980 RSI: 0000000000000001 RDI: ffff888113265a00
RBP: 0000000000000001 R08: ffffffff99c5c583 R09: 1ffffffff338b8b0
R10: dffffc0000000000 R11: ffffffff84732720 R12: dffffc0000000000
R13: ffff888106743ed8 R14: ffff888113265a00 R15: ffffffff8dbbfdd8
 security_vm_enough_memory_mm+0x6c/0x4f0
 shmem_inode_acct_blocks+0xd9/0x470
 shmem_alloc_and_add_folio+0x8bc/0xf60
 shmem_get_folio_gfp+0x59d/0x1660
 shmem_write_begin+0xf7/0x2b0
 generic_perform_write+0x2c7/0x910
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x54b/0xa90
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1ce178e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1ce2632038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1ce19b5fa0 RCX: 00007f1ce178e9a9
RDX: 00000000002a979d RSI: 0000200000000000 RDI: 000000000000000b
RBP: 00007f1ce1810d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1ce19b5fa0 R15: 00007ffd903ab368
 </TASK>
sched: DL replenish lagged too much
