rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10500 ticks this GP) idle=c2e/1/0x4000000000000000 softirq=316241/316241 fqs=0 
	(t=10500 jiffies g=491777 q=823)
rcu: rcu_preempt kthread starved for 10500 jiffies! g491777 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:
rcu_preempt     R  running task    28608    10      2 0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3453 [inline]
 __schedule+0x7d3/0xc40 kernel/sched/core.c:4178
NMI backtrace for cpu 1
CPU: 1 PID: 6152 Comm: syz-executor.5 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1f0/0x31e lib/dump_stack.c:118
 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x199/0x2a0 kernel/rcu/tree_stall.h:320
 print_cpu_stall kernel/rcu/tree_stall.h:553 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 rcu_pending kernel/rcu/tree.c:3489 [inline]
 rcu_sched_clock_irq+0x1928/0x1eb0 kernel/rcu/tree.c:2504
 update_process_times+0x12c/0x180 kernel/time/timer.c:1726
 tick_sched_handle kernel/time/tick-sched.c:176 [inline]
 tick_sched_timer+0x254/0x410 kernel/time/tick-sched.c:1320
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x42d/0x930 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0xf0/0x260 arch/x86/kernel/apic/apic.c:1097
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 sysvec_apic_timer_interrupt+0x112/0x130 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x57/0x80 kernel/locking/spinlock.c:199
Code: 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 00 c8 4b 89 e8 ea 7c 93 f9 48 83 3d 52 a8 2b 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 3f 7a 30 f9 65 8b 05 44 de e1 77 85 c0 74 02 5b
RSP: 0018:ffffc90000da8e10 EFLAGS: 00000282
RAX: 1ffffffff1297900 RBX: ffff8880ae925400 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff88201f7f
RBP: ffffc90000da8f00 R08: dffffc0000000000 R09: fffffbfff1674ab9
R10: fffffbfff1674ab9 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88806bc92338 R14: ffff88806bc92340 R15: ffffffff8699f250
 expire_timers kernel/time/timer.c:1448 [inline]
 __run_timers+0x726/0x930 kernel/time/timer.c:1773
 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1786
 __do_softirq+0x268/0x80c kernel/softirq.c:292
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0xe0/0x1a0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:387 [inline]
 __irq_exit_rcu+0x1e1/0x1f0 kernel/softirq.c:417
 irq_exit_rcu+0x6/0x50 kernel/softirq.c:429
 sysvec_apic_timer_interrupt+0x117/0x130 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
RIP: 0010:clear_page_erms+0x9/0x10 arch/x86/lib/clear_page_64.S:50
Code: 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 0f 1f 80 00 00 00 00 b9 00 10 00 00 31 c0 f3 aa <c3> cc cc cc cc cc cc 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 48
RSP: 0018:ffffc90017b7f880 EFLAGS: 00000246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88806a70c500 RSI: 0000000000000000 RDI: ffff8881cbf20000
RBP: 1ffff1100d4e1b29 R08: ffffffff81b2f6d8 R09: ffffed10397e3000
R10: fffff94000e5f8c7 R11: 0000000000000000 R12: ffff88806a70d948
R13: ffffea00072fc7c0 R14: 0005088000000000 R15: 0000000000000001
 clear_page arch/x86/include/asm/page_64.h:49 [inline]
 clear_highpage include/linux/highmem.h:283 [inline]
 kernel_init_free_pages mm/page_alloc.c:1168 [inline]
 prep_new_page+0x1ad/0x2e0 mm/page_alloc.c:2227
 get_page_from_freelist+0x818/0xa90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x27e/0x5e0 mm/page_alloc.c:4844
 alloc_pages include/linux/gfp.h:545 [inline]
 sg_build_indirect+0x2a7/0x910 drivers/scsi/sg.c:1943
 sg_start_req drivers/scsi/sg.c:1800 [inline]
 sg_common_write+0x109e/0x2310 drivers/scsi/sg.c:803
 sg_write+0xb57/0x11f0 drivers/scsi/sg.c:707
 vfs_write+0x2dd/0xc70 fs/read_write.c:576
 ksys_write+0x11b/0x220 fs/read_write.c:631
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1d9
Code: Bad RIP value.
RSP: 002b:00007f7f9e4f4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000036900 RCX: 000000000045c1d9
RDX: 0000000000000092 RSI: 0000000020000740 RDI: 0000000000000004
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffd9482d42f R14: 00007f7f9e4f59c0 R15: 000000000078bf0c