rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=49389, q=51)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4295011923-4295001423), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.5  R  running task    26792 22588  10795 0x00004000
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:5952 [inline]
 sched_show_task.cold+0x2ee/0x35d kernel/sched/core.c:5927
 print_other_cpu_stall kernel/rcu/tree_stall.h:430 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:558 [inline]
 rcu_pending kernel/rcu/tree.c:3030 [inline]
 rcu_sched_clock_irq.cold+0xb23/0xc37 kernel/rcu/tree.c:2276
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:171
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1314
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1144
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:155 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x20/0x50 kernel/kcov.c:187
Code: 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 65 48 8b 04 25 c0 1e 02 00 65 8b 15 44 8d 8c 7e 81 e2 00 01 1f 00 48 8b 75 08 75 2b <8b> 90 80 13 00 00 83 fa 02 75 20 48 8b 88 88 13 00 00 8b 80 84 13
RSP: 0018:ffffc900173bf288 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff88807be1a380 RBX: 0000000000000019 RCX: ffffffff8205c530
RDX: 0000000000000000 RSI: ffffffff8205f5a6 RDI: ffffea000236d700
RBP: ffffc900173bf288 R08: ffff88807be1a380 R09: fffff9400046dae1
R10: fffff9400046dae0 R11: ffffea000236d707 R12: 0000000000326c34
R13: dffffc0000000000 R14: ffffea000236d700 R15: ffffc900173bf3a8
 ext4_block_write_begin+0x96/0x1570 fs/ext4/inode.c:1017
 ext4_da_write_begin+0x5b3/0xc70 fs/ext4/inode.c:2997
 generic_perform_write+0x23b/0x540 mm/filemap.c:3287
 ext4_buffered_write_iter+0x1fe/0x460 fs/ext4/file.c:270
 ext4_file_write_iter+0x1fe/0x14e0 fs/ext4/file.c:642
 call_write_iter include/linux/fs.h:1901 [inline]
 do_iter_readv_writev+0x5f8/0x8f0 fs/read_write.c:693
 do_iter_write fs/read_write.c:998 [inline]
 do_iter_write+0x184/0x610 fs/read_write.c:979
 vfs_iter_write+0x77/0xb0 fs/read_write.c:1039
 iter_file_splice_write+0x717/0xc10 fs/splice.c:760
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0x123/0x190 fs/splice.c:1037
 splice_direct_to_actor+0x3b4/0xa30 fs/splice.c:992
 do_splice_direct+0x1da/0x2a0 fs/splice.c:1080
 do_sendfile+0x597/0xd00 fs/read_write.c:1520
 __do_sys_sendfile64 fs/read_write.c:1575 [inline]
 __se_sys_sendfile64 fs/read_write.c:1567 [inline]
 __x64_sys_sendfile64+0x15a/0x220 fs/read_write.c:1567
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c6c9
Code: ad b6 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f17cf49ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f17cf49b6d4 RCX: 000000000045c6c9
RDX: 00000000200001c0 RSI: 0000000000000003 RDI: 0000000000000003
RBP: 000000000076c070 R08: 0000000000000000 R09: 0000000000000000
R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008d0 R14: 00000000004cb5e8 R15: 000000000076c07c
rcu: rcu_preempt kthread starved for 10500 jiffies! g49389 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29152    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3380 [inline]
 __schedule+0x934/0x1f90 kernel/sched/core.c:4080
 schedule+0xdc/0x2b0 kernel/sched/core.c:4154
 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1658 [inline]
 rcu_gp_kthread+0xa10/0x1940 kernel/rcu/tree.c:1818
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352