rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=32e/1/0x4000000000000002 softirq=13707/13711 fqs=5224 
	(t=10500 jiffies g=6797 q=914)
NMI backtrace for cpu 1
CPU: 1 PID: 8564 Comm: syz-executor.0 Not tainted 5.5.0-rc5-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+0x1fb/0x318 lib/dump_stack.c:118
 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15a/0x220 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+0xe25/0x1ad0 kernel/rcu/tree.c:2271
 update_process_times+0x12d/0x180 kernel/time/timer.c:1726
 tick_sched_handle kernel/time/tick-sched.c:167 [inline]
 tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__memcg_kmem_uncharge+0x6/0x1a0 mm/memcontrol.c:2908
Code: bf ac 07 00 74 12 48 81 c3 08 02 00 00 48 89 df 4c 89 f6 e8 8c 85 ff ff 5b 41 5e 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 41 57 <41> 56 41 55 41 54 53 50 89 f3 49 89 fc 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc900028175d0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff81489244 RBX: ffffea00029f5240 RCX: 0000000000040000
RDX: ffffc90001ec9000 RSI: 0000000000000000 RDI: ffffea00029f5240
RBP: ffffc900028175d8 R08: dffffc0000000000 R09: fffffbfff124248a
R10: fffffbfff124248a R11: 0000000000000000 R12: ffff888092a4bf20
R13: dffffc0000000000 R14: 1ffff110125497e4 R15: ffff888093ecb478
 memcg_kmem_uncharge include/linux/memcontrol.h:1402 [inline]
 free_thread_stack+0x12e/0x590 kernel/fork.c:284
 release_task_stack kernel/fork.c:440 [inline]
 put_task_stack+0xa3/0x130 kernel/fork.c:451
 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256
 context_switch kernel/sched/core.c:3388 [inline]
 __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081
 schedule+0x181/0x210 kernel/sched/core.c:4155
 io_schedule+0x8b/0x100 kernel/sched/core.c:5799
 wait_on_page_bit_common+0x888/0xda0 mm/filemap.c:1175
 wait_on_page_bit+0x46/0x50 mm/filemap.c:1224
 wait_on_page_writeback+0x13e/0x180 mm/page-writeback.c:2822
 __filemap_fdatawait_range+0x1b5/0x3b0 mm/filemap.c:526
 file_write_and_wait_range+0x141/0x1a0 mm/filemap.c:786
 ext4_sync_file+0x1b5/0xc90 fs/ext4/fsync.c:153
 vfs_fsync_range+0xfd/0x1a0 fs/sync.c:197
 generic_write_sync include/linux/fs.h:2856 [inline]
 ext4_buffered_write_iter+0x548/0x5f0 fs/ext4/file.c:259
 ext4_file_write_iter+0x546/0x1f50 include/linux/fs.h:796
 do_iter_readv_writev+0x651/0x8e0 include/linux/fs.h:1896
 do_iter_write+0x180/0x590 fs/read_write.c:970
 vfs_writev fs/read_write.c:1015 [inline]
 do_pwritev+0x231/0x430 fs/read_write.c:1112
 __do_sys_pwritev fs/read_write.c:1159 [inline]
 __se_sys_pwritev fs/read_write.c:1154 [inline]
 __x64_sys_pwritev+0x9e/0xb0 fs/read_write.c:1154
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45af49
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:00007f850505ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000128
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045af49
RDX: 0000000000000001 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f850505f6d4
R13: 00000000004c963e R14: 00000000004e2118 R15: 00000000ffffffff