rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=80cc/1/0x4000000000000000 softirq=109181/109182 fqs=1021
rcu: 	(detected by 1, t=10506 jiffies, g=126877, q=1008 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 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:__lock_acquire+0x8cf/0x2e50
Code: 83 3d c8 1f d7 0e 00 0f 85 25 02 00 00 48 83 7c 24 18 00 0f 84 b1 01 00 00 49 8b 46 f8 25 ff 1f 00 00 48 0f a3 05 81 f0 f6 12 <0f> 83 55 01 00 00 48 69 c0 c8 00 00 00 48 8d 80 d0 14 3b 94 e9 7c
RSP: 0018:ffffc90000007b08 EFLAGS: 00000003
RAX: 000000000000006b RBX: 00000000eabd53a6 RCX: 00000000153e3a75
RDX: 00000000affc76cc RSI: 000000001e077acf RDI: ffff888102ed1e00
RBP: fc76794e00000000 R08: 3500000000000000 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff9ac948f0 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888102ed29d8 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818d6da000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000d000 CR3: 000000000eb48000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_acquire+0x115/0x350
 _raw_spin_lock_irqsave+0x40/0x60
 debug_object_activate+0xb7/0x420
 enqueue_hrtimer+0xa9/0x2c0
 __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:_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:ffffc90000147cc8 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000283 RCX: 8000000000000101
RDX: 0000000000000000 RSI: ffffffff8e473d0e RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff907a137f R09: 1ffffffff20f426f
R10: dffffc0000000000 R11: fffffbfff20f4270 R12: 0000000000000006
R13: 0000000000000008 R14: ffff888121028280 R15: 0000000000000020
 handle_softirqs+0x226/0x860
 run_ksoftirqd+0x36/0x60
 smpboot_thread_fn+0x565/0xa70
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: rcu_preempt kthread starved for 5375 jiffies! g126877 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:27344 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: 5339 Comm: dhcpcd 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:ffffc9000392f420 EFLAGS: 00000293
RAX: ffffffff81bb6a8e RBX: ffff888121043708 RCX: ffff8881053a0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000392f570 R08: ffff8881053a159f R09: 1ffff11020a742b3
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff110242086e1
R13: 0000000000000000 R14: ffff888121043700 R15: 0000000000000001
FS:  00007ff4c8bfa740(0000) GS:ffff8882a8cda000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555572e3a4e8 CR3: 000000010c696000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 flush_tlb_mm_range+0x8ff/0x1090
 dup_mmap+0x1758/0x1dc0
 copy_mm+0x11a/0x480
 copy_process+0x1e75/0x43e0
 kernel_clone+0x2d7/0x940
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff4c8caaa12
Code: 41 5d 41 5e 41 5f c3 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 10 48 8b 15 e7 43 0f 00 f7 d8 64 89 02 48 83
RSP: 002b:00007fffda590ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00005640a00ab001 RCX: 00007ff4c8caaa12
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fffda5b1048 R08: 0000000000000000 R09: 00005640a00aafe0
R10: 00007ff4c8bfaa10 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00005640a00ab014
 </TASK>
