rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=406c/1/0x4000000000000000 softirq=23513/23513 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=15969, q=255 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7058 Comm: syz.5.250 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 a2 15 12 00 48 89 df e8 9a f9 ff ff 89 c5 31 ff 89 c6 e8 cf 19 12 00 85 ed 78 0c e8 86 15 12 00 eb 1a e8 7f 15 12 00 f3 90 <48> 89 df e8 75 f9 ff ff 85 c0 78 ed 89 c5 e8 6a 15 12 00 89 e8 5b
RSP: 0018:ffffc90000007990 EFLAGS: 00000006
RAX: ffffffff81adb021 RBX: ffff888027158168 RCX: ffff88801fa81cc0
RDX: 0000000000010000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: 00000000ffffffff R08: ffff88804b027a83 R09: 1ffff11009604f50
R10: dffffc0000000000 R11: ffffed1009604f51 R12: ffff888027158210
R13: dffffc0000000000 R14: ffff888027158168 R15: ffffffffffff4fc2
FS:  00007fd1739ee6c0(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd1739ccfc8 CR3: 0000000106852000 CR4: 00000000000006f0
DR0: 0000000000000000 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:mod_objcg_mlstate+0x11a/0x260
Code: 0f 1f 44 00 00 4d 85 ed 75 07 4c 8b 2d 5f 3b 77 0d 49 81 c5 38 0c 00 00 4d 8d a7 00 4e 00 00 4c 89 e0 48 c1 e8 03 0f b6 04 28 <84> c0 0f 85 0b 01 00 00 49 63 04 24 4c 8d 24 c5 00 00 00 00 4d 01
RSP: 0018:ffffc9000252fb38 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffffffff822ca484 RCX: c4f65bc90dceb200
RDX: 0000000000000000 RSI: ffffffff8dbaa58c RDI: ffffffff8be34400
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff822ca484
R10: dffffc0000000000 R11: ffffed102001e131 R12: ffff888060000200
R13: ffff8881000f6738 R14: ffff88804b03c148 R15: ffff88805fffb400
 __account_obj_stock+0x96/0x310
 refill_obj_stock+0x32c/0x850
 obj_cgroup_charge_account+0x116/0x660
 __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: 0033:0x7fd17578ec29
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:00007fd1739ee038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007fd1759d5fa0 RCX: 00007fd17578ec29
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000000000000000a
RBP: 00007fd175811e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd1759d6038 R14: 00007fd1759d5fa0 R15: 00007ffe748874e8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g15969 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=5093
rcu: rcu_preempt kthread starved for 10502 jiffies! g15969 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27224 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>
