rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=5534/0/0x1 softirq=56412/56412 fqs=147
rcu: 	(detected by 0, t=10502 jiffies, g=52829, q=639 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G             L      syzkaller #0 PREEMPT(full) 
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:timerqueue_linked_add+0x2b1/0x2e0
Code: 41 80 3c 2e 00 74 08 4c 89 ff e8 0a 78 57 f6 49 83 3f 00 0f 94 c0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 00 30 07 00 cc <e8> 2a de e6 f5 48 83 c3 08 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08
RSP: 0018:ffffc90000a18d40 EFLAGS: 00000046
RAX: 1ffff1102ec37660 RBX: ffff88823c628518 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88823c628518 RDI: ffff8881761bb300
RBP: dffffc0000000000 R08: ffff8881761bb317 R09: 0000000000000000
R10: ffff8881761bb308 R11: ffffed102ec37663 R12: 1ffff110478c5098
R13: ffff8881761bb300 R14: 1ffff1102ec37663 R15: ffff8881761bb318
FS:  0000000000000000(0000) GS:ffff8882a7cd4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c24d6f0 CR3: 000000011dcb4000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 enqueue_hrtimer+0x18e/0x2c0
 __hrtimer_run_queues+0x4ce/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:pv_native_safe_halt+0xf/0x20
Code: 8c 94 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d d3 84 24 00 fb f4 <e9> cc 07 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc900001a7e40 EFLAGS: 00000206
RAX: 00000000002b36d7 RBX: ffffffff819b9f20 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e4c6bc3 RDI: ffffffff8c6dad80
RBP: ffffc900001a7f10 R08: ffff88823c633a1b R09: 1ffff110478c6743
R10: dffffc0000000000 R11: ffffed10478c6744 R12: 0000000000000000
R13: 1ffff1102c096000 R14: 1ffff92000034fd0 R15: dffffc0000000000
 default_idle+0x9/0x20
 default_idle_call+0x72/0xb0
 do_idle+0x2e0/0x540
 cpu_startup_entry+0x43/0x60
 start_secondary+0x101/0x110
 common_startup_64+0x13e/0x157
 </TASK>
rcu: rcu_preempt kthread starved for 10208 jiffies! g52829 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:R  running task     stack:27696 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: 0 UID: 0 PID: 5604 Comm: udevd Tainted: G             L      syzkaller #0 PREEMPT(full) 
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+0x61e/0x1500
Code: b6 04 04 84 c0 0f 85 d5 03 00 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
RSP: 0018:ffffc90004d67460 EFLAGS: 00000293
RAX: ffffffff81bb6aae RBX: ffff88823c6414c8 RCX: ffff888173ea8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90004d675b0 R08: ffff888173ea959f R09: 1ffff1102e7d52b3
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff110478c8299
R13: 0000000000000001 R14: ffff88823c6414c0 R15: 0000000000000001
FS:  00007fdded1b1c80(0000) GS:ffff88818c4d4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055980fd66258 CR3: 0000000177b1a000 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: 0033:0x7fddecd1d817
Code: ff ff 76 10 48 8b 15 10 36 0d 00 f7 d8 64 89 02 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 35 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd1ab31858 EFLAGS: 00000206 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 000055980ee395b0 RCX: 00007fddecd1d817
RDX: 000000055980fd52 RSI: 0000000000906623 RDI: 00007fddec200000
RBP: 000055980fd4cce0 R08: 0000000000000007 R09: 5f3b1af2e88d07d3
R10: 00000000ffffffff R11: 0000000000000206 R12: 000055980ee395e8
R13: 00007ffd1ab318d8 R14: 0000000000000001 R15: 000055980fd3c910
 </TASK>
