rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=09a4/1/0x4000000000000000 softirq=130986/130987 fqs=18
rcu: 	(detected by 3, t=10502 jiffies, g=171641, q=862 ncpus=4)
Sending NMI from CPU 3 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3127 Comm: syz.7.10134 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:check_preemption_disabled+0x0/0xe0 lib/smp_processor_id.c:13
Code: c0 75 0f 65 8b 05 ac ba 82 08 85 c0 74 04 90 0f 0b 90 e9 53 fc ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <41> 54 55 53 48 83 ec 08 65 8b 1d 85 76 82 08 65 f7 05 76 76 82 08
RSP: 0000:ffffc90003d77cb0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff888013f682c0 RCX: ffffc90003d77cc4
RDX: 0000000000000000 RSI: ffffffff8def561d RDI: ffffffff8c1c4580
RBP: ffffffff89980712 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880267eca80
R13: 18b5902f83fc0ce5 R14: 0000000000000006 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88809718a000(0063) knlGS:00000000577f8480
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000c3a2343 CR3: 000000007364f000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
 lock_release kernel/locking/lockdep.c:5891 [inline]
 lock_release+0x170/0x310 kernel/locking/lockdep.c:5875
 __raw_spin_unlock include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:190
 spin_unlock include/linux/spinlock.h:390 [inline]
 advance_sched+0x6a2/0xd20 net/sched/sch_taprio.c:988
 __run_hrtimer kernel/time/hrtimer.c:1930 [inline]
 __hrtimer_run_queues+0x470/0xa00 kernel/time/hrtimer.c:1994
 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1061
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0023:0xf70bdef7
Code: 3c 81 e1 ff 0f 00 00 83 f1 3d 8d 14 c9 89 d3 c1 eb 04 89 d8 31 d0 69 c0 2d eb d4 27 89 c2 c1 ea 0f 31 d0 31 d2 25 ff 0f 00 00 <89> d3 33 5c 24 04 89 c1 33 0c 24 89 5c 24 0c 89 4c 24 08 8b 5c 24
RSP: 002b:00000000ff943800 EFLAGS: 00000206
RAX: 0000000000000377 RBX: 00000000000008e6 RCX: 0000000000000fd3
RDX: 0000000000000000 RSI: 0000000000003e57 RDI: 00000000f7474fe8
RBP: 00000000f7fa5610 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10460 jiffies! g171641 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=3
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:26920 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1295/0x67a0 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7283
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: d6 95 02 e9 43 44 03 00 0f 1f 00 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 83 b0 24 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc9000048fdf0 EFLAGS: 00000206
RAX: 0000000000a5c047 RBX: ffff88801c3ca540 RCX: ffffffff8b86e225
RDX: 0000000000000000 RSI: ffffffff8df1ab41 RDI: ffffffff8c1c4580
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10056a67b5
R10: ffff88802b533dab R11: 0000000000000000 R12: 0000000000000003
R13: ffffed10038794a8 R14: 0000000000000003 R15: ffffffff90d73e50
FS:  0000000000000000(0000) GS:ffff88809748a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f50f1894 CR3: 000000002400a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000002106 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline]
 default_idle+0x9/0x10 arch/x86/kernel/process.c:767
 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x464/0x590 kernel/sched/idle.c:352
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:451
 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x148
 </TASK>