rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=35a/1/0x4000000000000002 softirq=10929/10929 fqs=18 
	(t=10500 jiffies g=6469 q=483)
rcu: rcu_preempt kthread starved for 10458 jiffies! g6469 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29032    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081
 schedule+0x181/0x210 kernel/sched/core.c:4155
 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline]
 rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 8199 Comm: blkid Not tainted 5.4.0-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+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:1514 [inline]
 __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638
 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+0x0/0x2e0 mm/memcontrol.c:2909
Code: 00 eb 1b 83 3d 80 ce 8c 07 00 74 12 48 81 c3 08 02 00 00 48 89 df 4c 89 f6 e8 dc 7d 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
RSP: 0018:ffffc90002517850 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff81486ea4 RBX: ffffea000286aa40 RCX: ffff888090eee4c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea000286aa40
RBP: ffffc90002517890 R08: 000000000003a768 R09: fffffbfff120248a
R10: fffffbfff120248a R11: 0000000000000000 R12: ffff88809fff95a0
R13: dffffc0000000000 R14: 1ffff11013fff2b4 R15: ffff888098f816a8
 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
 preempt_schedule_irq+0xc1/0x140 kernel/sched/core.c:4338
 retint_kernel+0x1b/0x2b
RIP: 0010:__kasan_check_read+0x0/0x20 mm/kasan/common.c:93
Code: 96 ff cc cc cc cc cc cc cc cc 65 48 8b 04 25 c0 1d 02 00 ff 80 68 13 00 00 c3 65 48 8b 04 25 c0 1d 02 00 ff 88 68 13 00 00 c3 <55> 48 89 e5 89 f6 48 8b 4d 08 31 d2 e8 8f 26 00 00 5d c3 0f 1f 00
RSP: 0018:ffffc90002517aa0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: ffff888090eee4c1 RBX: ffff88809e5d74b8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88809e5d74c0
RBP: ffffc90002517b18 R08: dffffc0000000000 R09: ffffed1013cbae99
R10: ffffed1013cbae99 R11: 0000000000000000 R12: ffff88809e5d7518
R13: ffff88809e5d74c0 R14: 1ffff11013cbaea3 R15: 1ffff11013cbae97
 up_read+0x1d/0x20 kernel/locking/rwsem.c:1577
 anon_vma_unlock_read include/linux/rmap.h:135 [inline]
 validate_mm+0x154/0x9b0 mm/mmap.c:410
 vma_link+0x264/0x290 mm/mmap.c:666
 mmap_region+0x1972/0x1cb0 mm/mmap.c:1807
 do_mmap+0xabb/0x1120 mm/mmap.c:1555
 do_mmap_pgoff include/linux/mm.h:2338 [inline]
 vm_mmap_pgoff+0x13d/0x1d0 mm/util.c:506
 ksys_mmap_pgoff+0x46b/0x560 mm/mmap.c:1607
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fa40c61a3ea
Code: 48 8d 3d 81 69 00 00 b2 84 e8 52 ec ff ff f7 d8 89 05 ae ad 20 00 eb c6 90 90 90 90 90 90 90 90 49 89 ca b8 09 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d 8a ad 20 00 31 d2 48 29 c2 89
RSP: 002b:00007ffdcb7b4278 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fa40c8229a8 RCX: 00007fa40c61a3ea
RDX: 0000000000000005 RSI: 000000000038c838 RDI: 0000000000000000
RBP: 00007ffdcb7b45d0 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000802 R11: 0000000000000246 R12: 00007ffdcb7b46b8
R13: 0000000000000002 R14: 0000000000000003 R15: 00007ffdcb7b42c0