rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=ab4c/1/0x4000000000000000 softirq=34353/34358 fqs=3
rcu: 	(detected by 1, t=10502 jiffies, g=30277, q=603 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8594 Comm: syz.1.737 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:rcu_is_watching+0x5a/0xb0
Code: f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 cc bc 88 00 48 c7 c3 d8 e8 6d 93 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 34 8b 03 65 ff 0d 49 cf c0 11 74 11 83 e0 04 c1 e8 02 5b
RSP: 0018:ffffc90000007c48 EFLAGS: 00000806
RAX: 0000000000000000 RBX: ffff8881210338d8 RCX: 0000000080010004
RDX: 0000000000000000 RSI: ffffffff8c4bbe60 RDI: ffffffff8c4bbe20
RBP: ffffffff84de8d57 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc90000007d38 R11: fffff52000000fa9 R12: 0000000000000000
R13: ffffffff9aa5ae10 R14: ffffffff8e4f67d0 R15: dffffc0000000000
FS:  00007f0ba4ff66c0(0000) GS:ffff88818d955000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0ba0000020 CR3: 0000000114bf6000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_acquire+0x5f/0x350
 _raw_spin_lock_irqsave+0x40/0x60
 debug_object_activate+0xb7/0x420
 enqueue_hrtimer+0xa9/0x2c0
 __hrtimer_run_queues+0x4ce/0xa10
 hrtimer_interrupt+0x448/0x910
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 2d ed cf f5 f7 c3 00 02 00 00 74 05 e8 90 cd fb f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> c4 00 c1 f5 65 8b 05 bd 40 99 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc90003a5fd28 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000202 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8e228aa9 RDI: 0000000000000001
RBP: ffffc90003a5fe30 R08: ffffffff90574737 R09: 1ffffffff20ae8e6
R10: dffffc0000000000 R11: fffffbfff20ae8e7 R12: 1ffff9200074bfb0
R13: 0000000000000000 R14: ffffffff9a7c49d8 R15: 000000000cb5c1b0
 do_settimeofday64+0x344/0x590
 __x64_sys_clock_settime+0x253/0x2a0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0ba6d9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0ba4ff6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f0ba7025fa0 RCX: 00007f0ba6d9e0d9
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007f0ba6e35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0ba7026038 R14: 00007f0ba7025fa0 R15: 00007ffd0fb13c88
 </TASK>
rcu: rcu_preempt kthread starved for 10496 jiffies! g30277 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27360 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0x152/0x2c0
 rcu_gp_fqs_loop+0x30c/0x11f0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 7841 Comm: syz-executor 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:__sanitizer_cov_trace_pc+0x10/0x70
Code: de 5b e9 93 12 62 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 98 ae a5 11 <65> 8b 15 b9 ae a5 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc90007527798 EFLAGS: 00000202
RAX: ffffffff81bae6ed RBX: dffffc0000000000 RCX: ffff8881115e3b80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900075278e8 R08: ffffffff90574737 R09: 1ffffffff20ae8e6
R10: dffffc0000000000 R11: fffffbfff20ae8e7 R12: 1ffff110242085fd
R13: ffff88823c63c448 R14: ffff888121042fe8 R15: 0000000000000000
FS:  000055557529a500(0000) GS:ffff8882a8f55000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b9cdb3000 CR3: 00000001732e4000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 smp_call_function_many_cond+0x11fd/0x15f0
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x5c4/0x1090
 tlb_flush_mmu+0x1af/0xa30
 tlb_finish_mmu+0xf4/0x220
 change_prot_numa+0x357/0x410
 task_numa_work+0xc17/0x15b0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x1fa/0x730
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa3fe99d1c7
Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd202c79f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffff RBX: 0000000000005d2c RCX: 00007fa3fe99d1c7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffd202c7ab0
RBP: 00007ffd202c7ab0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd202c8ba0
R13: 00007fa3fea34474 R14: 000055557529a4e8 R15: 0000000000000007
 </TASK>
