rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=e894/1/0x4000000000000000 softirq=98201/98202 fqs=9
rcu: 	(detected by 1, t=10505 jiffies, g=101465, q=1145 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15621 Comm: kworker/0:6 Tainted: G             L      syzkaller #0 PREEMPT(lazy) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events_freezable_pwr_efficient sync_hw_clock
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x80
Code: 89 fb e8 23 00 00 00 48 8b 3d b4 a9 ac 0c 48 89 de 5b e9 73 4b 64 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 48 a9 cc 11 65 48 8b 15 48 a9
RSP: 0018:ffffc90000007db8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 1ffff110223338f2 RCX: 0000000001000001
RDX: 0000000001000001 RSI: ffffffff8e6fc284 RDI: ffff88811199bc00
RBP: ffff888110076300 R08: 0000000001000001 R09: 1ffff1102200ec33
R10: dffffc0000000000 R11: ffffed102200ec34 R12: ffff88811199c790
R13: 0000000000000001 R14: ffff888121028520 R15: 1ffff1102420509a
FS:  0000000000000000(0000) GS:ffff88818d6da000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3c869f CR3: 00000001756f2000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __hrtimer_run_queues+0x3e3/0xa10
 hrtimer_interrupt+0x4cd/0xaa0
 __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 ed 53 bd f5 f7 c3 00 02 00 00 74 05 e8 e0 8d e9 f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 84 6d ae f5 65 48 8b 05 9c f1 ad 07 48 85 c0 74 18 5b 41 5e c3
RSP: 0018:ffffc90008577988 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000246 RCX: 8000000000000001
RDX: 0000000000000006 RSI: ffffffff8e473d0e RDI: 0000000000000001
RBP: ffffc90008577ad0 R08: ffffffff907a137f R09: 1ffffffff20f426f
R10: dffffc0000000000 R11: fffffbfff20f4270 R12: dffffc0000000000
R13: 1ffff920010aef38 R14: ffff888121028280 R15: 00000000fffffff5
 sync_hw_clock+0x3ae/0x4c0
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: rcu_preempt kthread starved for 10460 jiffies! g101465 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 schedule_timeout+0x152/0x2c0
 rcu_gp_fqs_loop+0x30c/0x11f0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x38b/0x480
 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: 21794 Comm: syz.5.6616 Tainted: G             L      syzkaller #0 PREEMPT(lazy) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:smp_call_function_many_cond+0x628/0x1500
Code: 00 44 8b 3b 44 89 fe 83 e6 01 31 ff e8 51 51 0c 00 41 83 e7 01 75 07 e8 46 4c 0c 00 eb 3f f3 90 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 75 0f f7 03 01 00 00 00 74 1d e8 22 4c 0c 00
RSP: 0018:ffffc9000372f460 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff888121043708 RCX: 0000000000080000
RDX: ffffc90020951000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000372f5b0 R08: ffff888171efef9f R09: 1ffff1102e3dfdf3
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff110242086e1
R13: 0000000000000000 R14: ffff888121043700 R15: 0000000000000001
FS:  00007f3b93ff66c0(0000) GS:ffff8882a8cda000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3a558b CR3: 00000001208d0000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 flush_tlb_mm_range+0x8ff/0x1090
 tlb_flush_mmu+0x1af/0xa30
 tlb_finish_mmu+0xf4/0x220
 unmap_region+0x2a5/0x330
 vms_complete_munmap_vmas+0x427/0xbe0
 do_vmi_align_munmap+0x3b7/0x4b0
 do_vmi_munmap+0x252/0x2d0
 __vm_munmap+0x241/0x3e0
 __x64_sys_munmap+0x60/0x70
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3b95d9df87
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 0b 00 00 00 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:00007f3b93ff5e08 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 0000000008000000 RCX: 00007f3b95d9df87
RDX: 0000000008000000 RSI: 0000000008400000 RDI: 00007f3b8ba00000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f3b93ff5ee0 R14: 00007f3b93ff5ea0 R15: 00007f3b8ba00000
 </TASK>
