rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=592/1/0x4000000000000000 softirq=60183/60183 fqs=5229 
	(t=10501 jiffies g=115945 q=1712)
NMI backtrace for cpu 0
CPU: 0 PID: 7675 Comm: syz-executor.0 Not tainted 5.9.0-rc2-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+0x18f/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x194/0x1cf kernel/rcu/tree_stall.h:318
 print_cpu_stall kernel/rcu/tree_stall.h:551 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 rcu_pending kernel/rcu/tree.c:3637 [inline]
 rcu_sched_clock_irq.cold+0x5b3/0xccd kernel/rcu/tree.c:2519
 update_process_times+0x25/0xa0 kernel/time/timer.c:1710
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 sysvec_apic_timer_interrupt+0x4c/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:rb_first+0x29/0x80 lib/rbtree.c:471
Code: 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 53 48 c1 ea 03 48 83 ec 08 80 3c 02 00 75 46 48 bb 00 00 00 00 00 fc ff df 48 8b 07 <48> 85 c0 75 05 eb 1d 48 89 d0 48 8d 78 10 48 89 fa 48 c1 ea 03 80
RSP: 0018:ffffc90000007cd8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff815b5860
RDX: 1ffff11014d6792a RSI: 0000000000000004 RDI: ffff8880a6b3c950
RBP: 0000000000000101 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52000000f90 R11: 0000000000000001 R12: ffff8880a6b3c800
R13: ffff8880a6b3c8b0 R14: 1ffff92000000fa7 R15: ffff8880ae6255c0
 mrp_mad_event net/802/mrp.c:570 [inline]
 mrp_join_timer+0x2f/0xc0 net/802/mrp.c:591
 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413
 expire_timers kernel/time/timer.c:1458 [inline]
 __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755
 __run_timers kernel/time/timer.c:1736 [inline]
 run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768
 __do_softirq+0x2de/0xa24 kernel/softirq.c:298
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </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+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:49
Code: 48 89 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 41 57 41 56 41 55 41 54 55 53 48 89 fb
RSP: 0018:ffffc9001777f998 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888000000000 RCX: 0000000000000900
RDX: 1ffff11011e00f35 RSI: ffffffff81a3ab91 RDI: ffff888016806700
RBP: ffff88808f006540 R08: ffffffffffffffe8 R09: 0000000000000000
R10: 0000000000000162 R11: 0000000000000001 R12: 0000000020800000
R13: 000000000000004f R14: 0000000020806000 R15: ffffea00005a0000
 clear_page arch/x86/include/asm/page_64.h:49 [inline]
 clear_user_page arch/x86/include/asm/page.h:28 [inline]
 clear_user_highpage include/linux/highmem.h:230 [inline]
 clear_subpage+0x7d/0x100 mm/memory.c:4960
 process_huge_page mm/memory.c:4923 [inline]
 clear_huge_page+0x1c1/0x530 mm/memory.c:4974
 __do_huge_pmd_anonymous_page mm/huge_memory.c:589 [inline]
 do_huge_pmd_anonymous_page+0x5cd/0x2230 mm/huge_memory.c:754
 create_huge_pmd mm/memory.c:4106 [inline]
 __handle_mm_fault mm/memory.c:4330 [inline]
 handle_mm_fault+0x369d/0x4590 mm/memory.c:4457
 do_user_addr_fault+0x598/0xbf0 arch/x86/mm/fault.c:1294
 handle_page_fault arch/x86/mm/fault.c:1351 [inline]
 exc_page_fault+0xa8/0x160 arch/x86/mm/fault.c:1404
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538
RIP: 0010:copy_user_generic_unrolled+0xa0/0xc0 arch/x86/lib/copy_user_64.S:100
Code: 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a 06 <88> 07 48 ff c6 48 ff c7 ff c9 75 f2 31 c0 0f 1f 00 c3 0f 1f 40 00
RSP: 0018:ffffc9001777fd28 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00000000209b1ffc RCX: 0000000000000004
RDX: 0000000000000004 RSI: ffffc9001777fdf8 RDI: 00000000209b1ffc
RBP: ffffc9001777fdf8 R08: 0000000000000000 R09: 0000000000000003
R10: fffff52002eeffbf R11: 0000000000000000 R12: 0000000000000004
R13: 00000000209b2000 R14: 00007ffffffff000 R15: 0000000000000000
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:74 [inline]
 _copy_to_user+0x11e/0x160 lib/usercopy.c:30
 copy_to_user include/linux/uaccess.h:168 [inline]
 do_timer_create+0xd08/0x14f0 kernel/time/posix-timers.c:550
 __do_sys_timer_create kernel/time/posix-timers.c:586 [inline]
 __se_sys_timer_create kernel/time/posix-timers.c:577 [inline]
 __x64_sys_timer_create+0x16f/0x1b0 kernel/time/posix-timers.c:577
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d579
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2e7f1e4c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000de
RAX: ffffffffffffffda RBX: 0000000000035f80 RCX: 000000000045d579
RDX: 00000000209b1ffc RSI: 0000000020066000 RDI: 0000000000000000
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 000000000169fb6f R14: 00007f2e7f1e59c0 R15: 000000000118cf4c