rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=76a4/1/0x4000000000000000 softirq=32587/32587 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=24245, q=353 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9734 Comm: syz.2.1007 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:preempt_count_add+0x146/0x1a0
Code: 48 c7 c1 20 33 ac 99 80 e1 07 80 c1 03 38 c1 0f 8c fa fe ff ff 89 fb 48 c7 c7 20 33 ac 99 e8 91 a4 93 00 89 df e9 e5 fe ff ff <48> c7 c1 20 33 ac 99 80 e1 07 80 c1 03 38 c1 0f 8c ff fe ff ff 89
RSP: 0018:ffffc900001e0860 EFLAGS: 00000002
RAX: 0000000000000004 RBX: ffff888136627a80 RCX: ffffffff99ac3303
RDX: 0000000000010000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc900001e0918 R08: ffff888136627a83 R09: 1ffff11026cc4f50
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: dffffc0000000000
R13: ffff888136627b00 R14: 0000000000000802 R15: dffffc0000000000
FS:  00007f64247d86c0(0000) GS:ffff8881a3c12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34910ff8 CR3: 0000000108ece000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 _raw_spin_lock_irqsave+0x8c/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:lock_is_held_type+0x137/0x190
Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 f9 13 26 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90007aa7b38 EFLAGS: 00000206
RAX: 155f7041b615d400 RBX: 0000000000000001 RCX: 155f7041b615d400
RDX: 0000000000000001 RSI: ffffffff8dbaa0c3 RDI: ffffffff8be34280
RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffff822bd27a
R10: ffff88802ba3ed38 R11: ffffffff81ac4d00 R12: 0000000000000246
R13: ffff888023090000 R14: ffffffff8e13a120 R15: 0000000000000000
 get_mem_cgroup_from_objcg+0xb9/0x1d0
 __memcg_slab_post_alloc_hook+0x12a/0x7f0
 kmem_cache_alloc_lru_noprof+0x2c7/0x3d0
 __d_alloc+0x36/0x7a0
 d_alloc_pseudo+0x21/0xc0
 alloc_file_pseudo+0xcc/0x210
 sock_alloc_file+0xb8/0x2e0
 __sys_socket+0x13d/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f642398ec29
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:00007f64247d8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f6423bd6090 RCX: 00007f642398ec29
RDX: 0000000000000084 RSI: 0000000000000003 RDI: 0000000000000002
RBP: 00007f6423a11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6423bd6128 R14: 00007f6423bd6090 R15: 00007fff63670028
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g24245 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=10926
rcu: rcu_preempt kthread starved for 10502 jiffies! g24245 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:26792 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>
