rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10500 ticks this GP) idle=4a2/1/0x4000000000000004 softirq=219866/219866 fqs=0 
	(t=10501 jiffies g=458545 q=95)
rcu: rcu_preempt kthread starved for 10502 jiffies! g458545 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    28848    10      2 0x80004000
Call Trace:
 schedule+0xd0/0x2a0 kernel/sched/core.c:4158
 schedule_timeout+0x35c/0x850 kernel/time/timer.c:1898
 rcu_gp_fqs_loop kernel/rcu/tree.c:1674 [inline]
 rcu_gp_kthread+0x9bf/0x1960 kernel/rcu/tree.c:1836
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 0
CPU: 0 PID: 12755 Comm: syz-executor.0 Not tainted 5.7.0-rc3-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+0x188/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x19b/0x1e5 kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:549 [inline]
 rcu_pending kernel/rcu/tree.c:3225 [inline]
 rcu_sched_clock_irq.cold+0x55d/0xcfa kernel/rcu/tree.c:2296
 update_process_times+0x25/0x60 kernel/time/timer.c:1727
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x4e/0x140 kernel/time/tick-sched.c:1320
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x5ca/0xed0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline]
 smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4b/0x80 kernel/locking/spinlock.c:199
Code: c0 30 c0 94 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d 4e 63 c4 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 3b a7 7e f9 65 8b 05 cc c1 31 78 85 c0 74 02 5d
RSP: 0018:ffffc90000007df8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1329806 RBX: ffffffff863939d0 RCX: 1ffffffff185d8f4
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880351f4d04
RBP: ffff8880ae627580 R08: 0000000000000001 R09: fffffbfff185cf3e
R10: ffffffff8c2e79ef R11: fffffbfff185cf3d R12: ffffc90000007e78
R13: dffffc0000000000 R14: ffff888092232010 R15: ffff8880ae627580
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1774 [inline]
 __run_timers kernel/time/timer.c:1741 [inline]
 run_timer_softirq+0x613/0x1600 kernel/time/timer.c:1787
 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x192/0x1d0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0x19e/0x600 arch/x86/kernel/apic/apic.c:1140
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline]
RIP: 0010:lock_acquire+0x267/0x8f0 kernel/locking/lockdep.c:4937
Code: 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 c6 05 00 00 48 83 3d d5 3c 3b 08 00 0f 84 65 04 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 08 48 c7
RSP: 0018:ffffc900176d77f0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1329804 RBX: ffff8880351f4440 RCX: aff0c23e3dfb8da4
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286
RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff185cf3e
R10: ffffffff8c2e79ef R11: fffffbfff185cf3d R12: 0000000000000000
R13: ffff888089e607d0 R14: 0000000000000000 R15: 0000000000000000
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:353 [inline]
 d_lookup_done include/linux/dcache.h:366 [inline]
 d_lookup_done include/linux/dcache.h:363 [inline]
 lookup_open+0x108c/0x1320 fs/namei.c:3062
 open_last_lookups fs/namei.c:3155 [inline]
 path_openat+0x93f/0x27d0 fs/namei.c:3343
 do_filp_open+0x192/0x260 fs/namei.c:3373
 do_sys_openat2+0x585/0x7d0 fs/open.c:1148
 do_sys_open+0xc3/0x140 fs/open.c:1164
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x270/0xe90 arch/x86/entry/common.c:396
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 12756 Comm: syz-executor.4 Not tainted 5.7.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:981 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0xd2/0x130 kernel/rcu/tree.c:968
Code: 7d 70 48 8b 5b 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 57 48 8b 45 70 48 85 c3 0f 95 c0 88 04 24 <bf> 01 00 00 00 e8 b4 a5 ee ff 0f b6 04 24 65 8b 15 41 c0 a1 7e 85
RSP: 0018:ffffc90000da8c68 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000002 RCX: 1ffffffff12bfd25
RDX: 1ffffffff13382b6 RSI: ffffffff8399fcaf RDI: ffffffff899c15b0
RBP: ffffffff899c1540 R08: ffff8880903fc200 R09: ffffed1015ce7104
R10: ffff8880ae73881b R11: ffffed1015ce7103 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:00000000f5d60b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f5d61000 CR3: 0000000094924000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
 rcu_read_lock_held_common+0xb8/0x130 kernel/rcu/update.c:98
 rcu_read_lock_sched_held+0x5a/0xd0 kernel/rcu/update.c:119
 trace_local_timer_exit arch/x86/include/asm/trace/irq_vectors.h:56 [inline]
 smp_apic_timer_interrupt+0x46f/0x600 arch/x86/kernel/apic/apic.c:1139
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4b/0x80 kernel/locking/spinlock.c:199
Code: c0 30 c0 94 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d 4e 63 c4 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 3b a7 7e f9 65 8b 05 cc c1 31 78 85 c0 74 02 5d
RSP: 0018:ffffc90000da8df8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1329806 RBX: ffffffff863939d0 RCX: 1ffffffff1863270
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880903fcac4
RBP: ffff8880ae727580 R08: 0000000000000001 R09: fffffbfff185cf4e
R10: ffffffff8c2e7a6f R11: fffffbfff185cf4d R12: ffffc90000da8e78
R13: dffffc0000000000 R14: ffff888037642c10 R15: ffff8880ae727580
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1774 [inline]
 __run_timers kernel/time/timer.c:1741 [inline]
 run_timer_softirq+0x613/0x1600 kernel/time/timer.c:1787
 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x192/0x1d0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0x19e/0x600 arch/x86/kernel/apic/apic.c:1140
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:unlock_page+0x0/0x2a0 mm/filemap.c:1290
Code: ff e8 f4 56 b3 ff e8 cf ec 1f 00 e9 f4 fe ff ff 4c 89 f7 e8 c2 ec 1f 00 e9 21 ff ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 <41> 57 41 56 41 55 41 54 55 48 89 fd 53 4c 8d 7d 08 e8 5a 20 e2 ff
RSP: 0018:ffffc90017cbf730 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: ffff8880461698b8 RCX: ffffc90011bbd000
RDX: 0000000000010478 RSI: ffffffff82027355 RDI: ffffea0001020480
RBP: ffffea0001020480 R08: ffff8880903fc200 R09: fffff94000204091
R10: ffffea0001020487 R11: fffff94000204090 R12: ffffc90017cbf8c8
R13: ffff8880461696d0 R14: dffffc0000000000 R15: 000000000002d000
 ext4_da_write_begin+0x32d/0xbc0 fs/ext4/inode.c:2967
 generic_perform_write+0x20a/0x4e0 mm/filemap.c:3302
 ext4_buffered_write_iter+0x1f7/0x450 fs/ext4/file.c:270
 ext4_file_write_iter+0x1ec/0x13f0 fs/ext4/file.c:642
 call_write_iter include/linux/fs.h:1907 [inline]
 aio_write+0x2f8/0x540 fs/aio.c:1583
 __io_submit_one fs/aio.c:1831 [inline]
 io_submit_one+0xfd5/0x2ec0 fs/aio.c:1878
 __do_compat_sys_io_submit fs/aio.c:1979 [inline]
 __se_compat_sys_io_submit fs/aio.c:1949 [inline]
 __ia32_compat_sys_io_submit+0x1bf/0x530 fs/aio.c:1949
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x270/0xe90 arch/x86/entry/common.c:396
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139