rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10504 jiffies, g=38713, q=176 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294976775-4294966273), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g38713 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=14803
rcu: rcu_preempt kthread starved for 10502 jiffies! g38713 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->cpu=0
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:R stack:26664 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>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11462 Comm: syz.6.1548 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:hrtimer_cancel+0x33/0x50
Code: e8 42 15 12 00 48 89 df e8 9a f9 ff ff 89 c5 31 ff 89 c6 e8 6f 19 12 00 85 ed 78 0c e8 26 15 12 00 eb 1a e8 1f 15 12 00 f3 90 <48> 89 df e8 75 f9 ff ff 85 c0 78 ed 89 c5 e8 0a 15 12 00 89 e8 5b
RSP: 0018:ffffc90000007990 EFLAGS: 00000006
RAX: ffffffff81adabe1 RBX: ffff888029c66ba8 RCX: ffff88802ffa0000
RDX: 0000000000010000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: 00000000ffffffff R08: ffff88804b027a83 R09: 1ffff11009604f50
R10: dffffc0000000000 R11: ffffed1009604f51 R12: ffff888029c66c50
R13: dffffc0000000000 R14: ffff888029c66ba8 R15: ffffffffffff4f42
FS:  00007fcda51346c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000029c0 CR3: 0000000038c08000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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:obj_cgroup_charge_pages+0x0/0xa0
Code: 03 38 ca 0f 8c f7 fe ff ff 4c 89 e7 89 c5 e8 c7 fa f7 ff 89 e8 e9 e6 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 41 56 53 41 89 d6 89 f5 e8 42 19 00 00 48 89 c3 48 89 c7 89 ee
RSP: 0018:ffffc90007d8fc10 EFLAGS: 00000213
RAX: 0000000080000000 RBX: 0000000000000608 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000cc0 RDI: ffff88802660b300
RBP: ffff88804b03b528 R08: 0000000000000000 R09: ffffffff822b479b
R10: 0000000000000406 R11: 0000000000000000 R12: 0000000000000005
R13: ffff88804b03b530 R14: ffff88802660b300 R15: 0000000000000608
 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_socketpair+0x1c5/0x560
 __x64_sys_socketpair+0x9b/0xb0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcda438eba9
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:00007fcda5134038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007fcda45d5fa0 RCX: 00007fcda438eba9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001
RBP: 00007fcda4411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000380 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcda45d6038 R14: 00007fcda45d5fa0 R15: 00007ffc473c1fe8
 </TASK>
