rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=4fe/1/0x4000000000000004 softirq=114413/114413 fqs=5049 
	(t=10500 jiffies g=210865 q=1849)
NMI backtrace for cpu 0
CPU: 0 PID: 11646 Comm: syz-executor.4 Not tainted 5.7.0-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+0x1e6/0x221 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: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:3471 [inline]
 rcu_sched_clock_irq.cold+0x55a/0xd25 kernel/rcu/tree.c:2486
 update_process_times+0x25/0x60 kernel/time/timer.c:1726
 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:1080 [inline]
 smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1105
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:lock_acquire+0x267/0x8f0 kernel/locking/lockdep.c:4962
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 f5 ad 3a 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:ffffc90000007c18 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13295d8 RBX: ffff88802a668400 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282
RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff1868f4f
R10: ffffffff8c347a77 R11: fffffbfff1868f4e R12: 0000000000000000
R13: ffffc90000007d60 R14: 0000000000000000 R15: 0000000000000000
 call_timer_fn+0x12e/0x780 kernel/time/timer.c:1401
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x623/0x1600 kernel/time/timer.c:1786
 __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:1107
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
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 d0 ae 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 0e 92 b6 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 0b 76 71 f9 65 8b 05 ec 01 24 78 85 c0 74 02 5d
RSP: 0018:ffffc90017076ae8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13295da RBX: ffff88802a668400 RCX: 1ffffffff15173ba
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff88802a668c80
RBP: ffff8880ae637dc0 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff8c347a57 R11: fffffbfff1868f4a R12: ffff8880ae637dc0
R13: ffff888032804400 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:3169 [inline]
 finish_task_switch+0x147/0x750 kernel/sched/core.c:3269
 context_switch kernel/sched/core.c:3433 [inline]
 __schedule+0x8fb/0x1fc0 kernel/sched/core.c:4156
 preempt_schedule_common+0x4a/0xc0 kernel/sched/core.c:4312
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:50
 is_module_text_address+0x40/0x47 kernel/module.c:4495
 kernel_text_address+0x62/0xe0 kernel/extable.c:145
 __kernel_text_address+0x9/0x30 kernel/extable.c:105
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:317 [inline]
 unwind_get_return_address+0x5a/0xa0 arch/x86/kernel/unwind_orc.c:312
 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc mm/kasan/common.c:494 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484
 kmem_cache_zalloc include/linux/slab.h:659 [inline]
 ext4_init_io_end+0x23/0x170 fs/ext4/page-io.c:279
 ext4_writepages+0x928/0x31d0 fs/ext4/inode.c:2718
 do_writepages+0xfa/0x2a0 mm/page-writeback.c:2354
 __filemap_fdatawrite_range+0x2aa/0x390 mm/filemap.c:421
 file_write_and_wait_range+0x172/0x200 mm/filemap.c:760
 ext4_sync_file+0x46b/0x10d0 fs/ext4/fsync.c:153
 vfs_fsync_range+0x138/0x220 fs/sync.c:199
 generic_write_sync include/linux/fs.h:2894 [inline]
 ext4_buffered_write_iter+0x2fd/0x450 fs/ext4/file.c:277
 ext4_file_write_iter+0x1ec/0x13f0 fs/ext4/file.c:642
 call_write_iter include/linux/fs.h:1917 [inline]
 do_iter_readv_writev+0x51e/0x790 fs/read_write.c:694
 do_iter_write fs/read_write.c:999 [inline]
 do_iter_write+0x18b/0x600 fs/read_write.c:980
 vfs_iter_write+0x70/0xa0 fs/read_write.c:1040
 iter_file_splice_write+0x695/0xb10 fs/splice.c:750
 do_splice_from+0x86/0x110 fs/splice.c:846
 direct_splice_actor+0xa3/0x110 fs/splice.c:1016
 splice_direct_to_actor+0x38c/0x980 fs/splice.c:971
 do_splice_direct+0x1b4/0x280 fs/splice.c:1059
 do_sendfile+0x555/0xc50 fs/read_write.c:1521
 __do_sys_sendfile64 fs/read_write.c:1576 [inline]
 __se_sys_sendfile64 fs/read_write.c:1568 [inline]
 __x64_sys_sendfile64+0x149/0x210 fs/read_write.c:1568
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45ca69
Code: 0d b7 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2a2cceec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000004fc580 RCX: 000000000045ca69
RDX: 0000000020000000 RSI: 0000000000000008 RDI: 0000000000000008
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008dc R14: 00000000004cba56 R15: 00007f2a2ccef6d4