rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=33a/1/0x4000000000000002 softirq=405876/405876 fqs=5220 
	(t=10500 jiffies g=467457 q=1999)
NMI backtrace for cpu 1
CPU: 1 PID: 6375 Comm: syz-executor.0 Not tainted 5.5.0-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+0x197/0x210 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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+0x183/0x1cf 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:2827 [inline]
 rcu_sched_clock_irq.cold+0x509/0xc02 kernel/rcu/tree.c:2271
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310
 __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:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_pc+0x26/0x50 kernel/kcov.c:187
Code: 00 00 00 00 55 48 89 e5 65 48 8b 04 25 c0 1e 02 00 65 8b 15 84 f0 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 00 00 48 8b 11 48
RSP: 0018:ffffc90002276f88 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff88804ae48340 RBX: 0000000000000001 RCX: ffffffff81cd7184
RDX: 0000000000000002 RSI: ffffffff81cd718d RDI: 0000000000000005
RBP: ffffc90002276f88 R08: ffff88804ae48340 R09: fffffbfff14f3321
R10: fffffbfff14f3320 R11: ffffffff8a799907 R12: 0000000000000000
R13: 0000000000000430 R14: 0000000000000000 R15: ffff8880925e1a80
 trace_block_touch_buffer include/trace/events/block.h:45 [inline]
 touch_buffer fs/buffer.c:62 [inline]
 __find_get_block+0x77d/0xea0 fs/buffer.c:1340
 __getblk_gfp+0x38/0xae0 fs/buffer.c:1358
 sb_getblk include/linux/buffer_head.h:325 [inline]
 __ext4_get_inode_loc+0x3e4/0x1280 fs/ext4/inode.c:4240
 ext4_get_inode_loc+0x61/0x80 fs/ext4/inode.c:4355
 ext4_reserve_inode_write+0xce/0x240 fs/ext4/inode.c:5566
 ext4_mark_inode_dirty+0x191/0x9c0 fs/ext4/inode.c:5732
 ext4_dirty_inode+0xec/0x130 fs/ext4/inode.c:5771
 __mark_inode_dirty+0x68e/0x1390 fs/fs-writeback.c:2258
 mark_inode_dirty include/linux/fs.h:2172 [inline]
 generic_write_end+0x32c/0x420 fs/buffer.c:2199
 ext4_da_write_end+0x209/0xb60 fs/ext4/inode.c:3091
 generic_perform_write+0x2fe/0x540 mm/filemap.c:3320
 ext4_buffered_write_iter+0x1fe/0x460 fs/ext4/file.c:252
 ext4_file_write_iter+0x20d/0x1770 fs/ext4/file.c:547
 call_write_iter include/linux/fs.h:1902 [inline]
 do_iter_readv_writev+0x5f8/0x8f0 fs/read_write.c:693
 do_iter_write fs/read_write.c:970 [inline]
 do_iter_write+0x184/0x610 fs/read_write.c:951
 vfs_iter_write+0x77/0xb0 fs/read_write.c:983
 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:1464
 __do_sys_sendfile64 fs/read_write.c:1519 [inline]
 __se_sys_sendfile64 fs/read_write.c:1511 [inline]
 __x64_sys_sendfile64+0x15a/0x220 fs/read_write.c:1511
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a919
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:00007efd294e1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919
RDX: 00000000200001c0 RSI: 0000000000000008 RDI: 0000000000000008
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 00008080fffffffe R11: 0000000000000246 R12: 00007efd294e26d4
R13: 00000000004c925e R14: 00000000004e0f88 R15: 00000000ffffffff
sched: RT throttling activated