rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=59ec/1/0x4000000000000000 softirq=44193/44193 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11107
rcu: 	(detected by 1, t=10502 jiffies, g=33477, q=93 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11107 Comm: syz.5.1538 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+0x57/0xd20
Code: 48 3d 20 a3 64 93 0f 84 6f 0c 00 00 41 89 cc 41 89 d6 8b 0d ab 3a 63 0c 85 c9 44 0f 44 c1 31 c9 48 3d 10 a3 64 93 41 0f 45 c8 <89> 4c 24 0c 8b 0d 8f bf 0e 18 85 c9 0f 95 c0 83 fe 08 0f 92 c2 08
RSP: 0018:ffffc90000007750 EFLAGS: 00000087
RAX: ffff88804b027a98 RBX: ffff88804b027a98 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888023329cc0
RBP: ffffffff81ada78b R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: ffffed1009604f51 R12: 0000000000000000
R13: ffff88804b027a98 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f9ed00196c0(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30619ff8 CR3: 0000000119adc000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 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:lock_release+0x9/0x3e0
Code: 24 e9 08 fa ff ff 66 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 55 41 57 41 56 <41> 55 41 54 53 48 83 ec 30 49 89 f5 49 89 fe 65 48 8b 05 a0 5f 03
RSP: 0018:ffffc90002dbf338 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff90ba0801 RCX: 4ec00a42c83f4000
RDX: ffffc90002dbf401 RSI: ffffffff8172d195 RDI: ffffffff8e13a120
RBP: dffffc0000000000 R08: ffffc90002dbfd90 R09: 0000000000000000
R10: ffffc90002dbf478 R11: fffff520005b7e91 R12: ffffc90002dbfda0
R13: ffffc90002db8000 R14: ffffc90002dbf428 R15: ffffffff8172d195
 unwind_next_frame+0x19a9/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 kmalloc_reserve+0xbd/0x290
 __alloc_skb+0x142/0x2d0
 netlink_sendmsg+0x5c6/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9ecf18ec29
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:00007f9ed0019038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f9ecf3d5fa0 RCX: 00007f9ecf18ec29
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000007
RBP: 00007f9ecf211e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9ecf3d6038 R14: 00007f9ecf3d5fa0 R15: 00007ffd495cb1c8
 </TASK>
task:syz.5.1538      state:R  running task     stack:23096 pid:11107 tgid:11106 ppid:7614   task_flags:0x400140 flags:0x00004000
Call Trace:
 <TASK>
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g33477 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=12506
rcu: rcu_preempt kthread starved for 10502 jiffies! g33477 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:26856 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>
