rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4658/1:b..l
	(detected by 0, t=10502 jiffies, g=10569, q=312)
task:syz.0.81        state:R  running task     stack:28048 pid: 4658 ppid:  4238 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:rep_nop arch/x86/include/asm/vdso/processor.h:-1 [inline]
RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
RIP: 0010:rtmutex_spin_on_owner kernel/locking/rtmutex.c:1477 [inline]
RIP: 0010:rt_mutex_slowlock_block+0x40b/0x5a0 kernel/locking/rtmutex.c:1604
Code: 48 c7 c7 f0 28 19 8c e8 a3 8b f8 f7 48 83 3d 2b 61 53 02 00 0f 84 9a 01 00 00 4c 89 ff e8 9d d5 6e f7 66 90 84 c0 75 70 f3 90 <48> 8b 44 24 20 42 80 3c 30 00 4c 8b 7c 24 18 0f 84 1a ff ff ff 4c
RSP: 0018:ffffc9000310f920 EFLAGS: 00000246
RAX: ffff8880b9000000 RBX: ffff88801ddf5940 RCX: ffffffff89c5c747
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffff8880214b1dc0 R08: ffff88801ddf5947 R09: 1ffff11003bbeb28
R10: dffffc0000000000 R11: ffffed1003bbeb29 R12: 1ffff110042963be
R13: ffff88802358c458 R14: dffffc0000000000 R15: 0000000000000000
 rt_mutex_wait_proxy_lock+0x7c/0xf0 kernel/locking/rtmutex_api.c:358
 futex_lock_pi+0x70c/0xc00 kernel/futex/core.c:3139
 do_futex+0xdca/0x12b0 kernel/futex/core.c:-1
 __do_sys_futex kernel/futex/core.c:4060 [inline]
 __se_sys_futex+0x389/0x420 kernel/futex/core.c:4041
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f696df97dd9
RSP: 002b:00007f696c1d0028 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f696e211090 RCX: 00007f696df97dd9
RDX: 0000000000000000 RSI: 000000000000000d RDI: 000020000000cffc
RBP: 00007f696e02dd69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f696e211128 R14: 00007f696e211090 R15: 00007ffca8353188
 </TASK>
rcu: rcu_preempt kthread starved for 9777 jiffies! g10569 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:27800 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:729