rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=636/1/0x4000000000000002 softirq=28197/28197 fqs=5250 
	(t=10502 jiffies g=46393 q=1487)
NMI backtrace for cpu 0
CPU: 0 PID: 16696 Comm: syz-executor4 Not tainted 5.4.0-rc2+ #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+0x113/0x167 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.7+0x4b/0x84 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x18b/0x1b7 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x16f/0x1bc kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2795 [inline]
 rcu_sched_clock_irq.cold.84+0x4fb/0xc3e kernel/rcu/tree.c:2244
 update_process_times+0x23/0x50 kernel/time/timer.c:1726
 tick_sched_handle+0x77/0x140 kernel/time/tick-sched.c:167
 tick_sched_timer+0x43/0x100 kernel/time/tick-sched.c:1299
 __run_hrtimer kernel/time/hrtimer.c:1514 [inline]
 __hrtimer_run_queues+0x332/0xb50 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x2df/0x760 kernel/time/hrtimer.c:1638
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x16f/0x600 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:92 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:109 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline]
RIP: 0010:check_memory_region+0x123/0x1d0 mm/kasan/generic.c:192
Code: 0d 00 4d 85 c0 75 49 4c 89 e3 48 29 c3 e9 60 ff ff ff 48 85 db 74 2a 41 80 39 00 75 30 48 b8 01 00 00 00 00 fc ff df 49 01 d9 <49> 01 c0 eb 0d 41 80 38 00 49 8d 40 01 75 8e 49 89 c0 4d 39 c8 75
RSP: 0018:ffff88809038f148 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000001 RBX: 0000000000000001 RCX: ffffffff817d823f
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880937a90b0
RBP: ffff88809038f160 R08: 1ffff110126f5216 R09: ffffed10126f5217
R10: ffffed10126f5216 R11: ffff8880937a90b7 R12: ffffed10126f5217
R13: 0000000000000010 R14: dffffc0000000000 R15: ffff88809038f570
 __kasan_check_read+0x11/0x20 mm/kasan/common.c:92
 atomic64_read include/asm-generic/atomic-instrumented.h:836 [inline]
 atomic_long_read include/asm-generic/atomic-long.h:28 [inline]
 perf_event_count kernel/events/core.c:3997 [inline]
 perf_output_read_group kernel/events/core.c:6279 [inline]
 perf_output_read+0xb5f/0x1470 kernel/events/core.c:6316
 perf_output_sample+0x1000/0x18c0 kernel/events/core.c:6358
 __perf_event_output kernel/events/core.c:6682 [inline]
 perf_event_output_forward+0x10e/0x1f0 kernel/events/core.c:6696
 __perf_event_overflow+0x11f/0x320 kernel/events/core.c:8163
 perf_swevent_overflow+0x62/0xc0 kernel/events/core.c:8239
 perf_swevent_event+0x1f5/0x2f0 kernel/events/core.c:8272
 do_perf_sw_event kernel/events/core.c:8380 [inline]
 ___perf_sw_event+0x25b/0x3f0 kernel/events/core.c:8411
 __perf_sw_event+0x3c/0x60 kernel/events/core.c:8423
 perf_sw_event include/linux/perf_event.h:1109 [inline]
 do_user_addr_fault arch/x86/mm/fault.c:1482 [inline]
 __do_page_fault+0x618/0xa50 arch/x86/mm/fault.c:1506
 do_page_fault+0x2d/0x3c8 arch/x86/mm/fault.c:1530
 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1202
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x30 arch/x86/lib/copy_user_64.S:205
Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 <f3> a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4
RSP: 0018:ffff88809038fb18 EFLAGS: 00010206
RAX: 0000000000000001 RBX: ffff888094d7e000 RCX: 0000000000000340
RDX: 0000000000001000 RSI: 00000000208e0000 RDI: ffff888094d7ecc0
RBP: ffff88809038fb40 R08: ffffed10129afe00 R09: 0000000000000000
R10: ffffed10129afdff R11: ffff888094d7efff R12: 00000000208df340
R13: ffff88808bbf0000 R14: 0000000000001000 R15: ffff88809038fcd0
 copy_page_from_iter_iovec lib/iov_iter.c:295 [inline]
 copy_page_from_iter+0x1bc/0x780 lib/iov_iter.c:921
 pipe_write+0x210/0xcd0 fs/pipe.c:455
 call_write_iter include/linux/fs.h:1895 [inline]
 new_sync_write+0x402/0x7e0 fs/read_write.c:483
 __vfs_write+0x97/0x110 fs/read_write.c:496
 vfs_write+0x18a/0x520 fs/read_write.c:558
 ksys_write+0x105/0x220 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x6e/0xb0 fs/read_write.c:620
 do_syscall_64+0xd0/0x5e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457f89
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fcb6bd0bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457f89
RDX: 0000000041395527 RSI: 0000000020000340 RDI: 0000000000000006
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcb6bd0c6d4
R13: 00000000004c3cae R14: 00000000004dc448 R15: 00000000ffffffff