syzbot

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=89a/1/0x4000000000000000 softirq=66211/66215 fqs=4641 
	(t=10500 jiffies g=105553 q=158900)
NMI backtrace for cpu 0
CPU: 0 PID: 4681 Comm: syz-executor.3 Not tainted 5.10.0-rc7-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+0x107/0x163 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331
 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:637 [inline]
 rcu_pending kernel/rcu/tree.c:3694 [inline]
 rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567
 update_process_times+0x77/0xd0 kernel/time/timer.c:1709
 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:1519 [inline]
 __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:preempt_count_sub+0x5f/0x150 kernel/sched/core.c:4224
Code: a8 0d 85 c9 75 1b 65 8b 05 ee a9 b6 7e 89 c2 81 e2 ff ff ff 7f 39 da 7c 13 81 fb fe 00 00 00 76 63 f7 db 65 01 1d d1 a9 b6 7e <5b> c3 e8 6a 5e 9a 07 85 c0 74 f5 48 c7 c0 18 e0 ec 8c 48 ba 00 00
RSP: 0018:ffffc90000007e08 EFLAGS: 00000213
RAX: 0000000000000102 RBX: 00000000ffffffff RCX: 0000000000000000
RDX: 0000000000000102 RSI: 0000000000000102 RDI: 0000000000000001
RBP: ffff8880b9e24780 R08: 0000000000000001 R09: ffffffff8ebaf75f
R10: fffffbfff1d75eeb R11: 0000000000000001 R12: ffffc90000007ea8
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880b9e24780
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
 _raw_spin_unlock_irq+0x2a/0x40 kernel/locking/spinlock.c:199
 expire_timers kernel/time/timer.c:1454 [inline]
 __run_timers.part.0+0x66c/0xa50 kernel/time/timer.c:1747
 __run_timers kernel/time/timer.c:1728 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760
 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/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+0x132/0x200 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:schedule_debug kernel/sched/core.c:4278 [inline]
RIP: 0010:__schedule+0x139/0x2130 kernel/sched/core.c:4423
Code: 7d 1a 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b 45 18 48 89 c1 48 c1 e9 03 80 3c 11 00 0f 85 43 1a 00 00 48 81 38 9d 6e ac 57 <0f> 85 c5 1f 00 00 49 8d 45 10 84 db 48 89 85 68 ff ff ff 75 28 48
RSP: 0018:ffffc90017597890 EFLAGS: 00000246
RAX: ffffc90017590000 RBX: 0000000000000001 RCX: 1ffff92002eb2000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880756f0018
RBP: ffffc90017597958 R08: 0000000000000001 R09: ffffffff8ebaf75f
R10: fffffbfff1d75eeb R11: 0000000000000001 R12: ffff8880b9e34940
R13: ffff8880756f0000 R14: ffff8880b9e34940 R15: 0000000000034940
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:4789
 irqentry_exit_cond_resched kernel/entry/common.c:357 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:349 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:387
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:85 [inline]
RIP: 0010:lock_acquire kernel/locking/lockdep.c:5440 [inline]
RIP: 0010:lock_acquire+0x2c7/0x740 kernel/locking/lockdep.c:5402
Code: 48 c7 c7 40 5f 4b 89 48 83 c4 20 e8 93 77 8f 07 b8 ff ff ff ff 65 0f c1 05 56 d2 ab 7e 83 f8 01 0f 85 36 03 00 00 ff 34 24 9d <e9> 3a fe ff ff 65 ff 05 fd c0 ab 7e 48 8b 05 76 bf 82 0b e8 21 6c
RSP: 0018:ffffc90017597a30 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 1ffff92002eb2f48 RCX: 0000000000000001
RDX: 1ffff1100eade122 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8ebaf667
R10: fffffbfff1d75ecc R11: 1ffffffff1667f48 R12: 0000000000000002
R13: ffffffff8b3378e0 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:248 [inline]
 rcu_read_lock include/linux/rcupdate.h:641 [inline]
 perf_event_update_userpage+0xa2/0x7b0 kernel/events/core.c:5688
 perf_mmap+0x12f0/0x1780 kernel/events/core.c:6189
 call_mmap include/linux/fs.h:1908 [inline]
 mmap_region+0xcde/0x1710 mm/mmap.c:1807
 do_mmap+0xcf9/0x11d0 mm/mmap.c:1583
 vm_mmap_pgoff+0x195/0x200 mm/util.c:507
 ksys_mmap_pgoff+0x444/0x580 mm/mmap.c:1634
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e159
Code: 0d 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff29802ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045e159
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffc000
RBP: 000000000119bfd8 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffc508a848f R14: 00007ff29802f9c0 R15: 000000000119bf8c