rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=cd54/1/0x4000000000000000 softirq=64298/64298 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=45525, q=130 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11368 Comm: syz.5.1338 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:__lock_acquire+0x870/0xd20
Code: f0 41 89 cf 41 c1 c7 13 29 ce 41 31 f7 01 c1 44 29 f8 44 01 f9 41 c1 c7 04 41 31 c7 49 c1 e7 20 49 09 cf 83 3d 84 73 06 0e 00 <0f> 85 36 02 00 00 48 83 7c 24 28 00 0f 84 bc 01 00 00 41 8b 46 f8
RSP: 0018:ffffc900001e0750 EFLAGS: 00000046
RAX: 00000000fd2c37c4 RBX: 0000000000000000 RCX: 0000000090213bdc
RDX: 00000000001a71fd RSI: 00000000727d5714 RDI: ffff88811cf88000
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff81adabcb
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: 0000000000000068
R13: ffff88811cf88af0 R14: ffff88811cf88af0 R15: d6bf87c490213bdc
FS:  00007feb19abe6c0(0000) GS:ffff8881a3c0f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e623ffc CR3: 0000000036c60000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360
 _raw_spin_lock_irqsave+0xa7/0xf0
 hrtimer_try_to_cancel+0x22b/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:css_rstat_updated+0xd9/0x4f0
Code: 24 38 4d 8b 66 08 49 39 de 74 28 49 83 c4 38 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 cc 44 6b 00 49 83 3c 24 00 <74> 6d e8 20 21 07 00 eb 0e 4d 85 e4 0f 85 04 03 00 00 e8 10 21 07
RSP: 0018:ffffc90003affaa0 EFLAGS: 00000286
RAX: 1ffffffff1f47dc0 RBX: ffff888119a2f000 RCX: 0000000000080000
RDX: ffffc900214c5000 RSI: 000000000000005e RDI: 000000000000005f
RBP: ffffc90003affb80 R08: 0000000000000000 R09: ffffffff822c641a
R10: 0000000000000406 R11: 0000000000000002 R12: ffffffff8fa3ee00
R13: dffffc0000000000 R14: ffff88811e474100 R15: 1ffff9200075ff5c
 memcg_rstat_updated+0x2c/0x220
 mod_memcg_state+0x113/0x2f0
 obj_cgroup_charge_pages+0x34/0xa0
 obj_cgroup_charge_account+0xcf/0x660
 __memcg_slab_post_alloc_hook+0x3e6/0x7f0
 kmem_cache_alloc_lru_noprof+0x2c7/0x3d0
 sock_alloc_inode+0x28/0xc0
 alloc_inode+0x6a/0x1b0
 __sock_create+0x12d/0x9f0
 __sys_socket+0xd7/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feb18b8ec29
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:00007feb19abe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007feb18dd5fa0 RCX: 00007feb18b8ec29
RDX: 0000000000000006 RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00007feb18c11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007feb18dd6038 R14: 00007feb18dd5fa0 R15: 00007fff006f8d98
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g45525 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=20835
rcu: rcu_preempt kthread starved for 10502 jiffies! g45525 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:26728 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
