rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=71a/1/0x4000000000000002 softirq=10843/10843 fqs=1 
	(t=10501 jiffies g=6005 q=16)
rcu: rcu_preempt kthread starved for 10500 jiffies! g6005 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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 0
CPU: 0 PID: 8163 Comm: udevd 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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:101
Code: 84 00 00 00 00 00 55 48 89 e5 53 48 89 fb e8 13 00 00 00 48 8b 3d 34 e7 cc 07 48 89 de e8 64 02 3b 00 5b 5d c3 cc 48 8b 04 24 <65> 48 8b 0c 25 c0 1d 02 00 65 8b 15 b8 81 8b 7e f7 c2 00 01 1f 00
RSP: 0018:ffffc90001f976f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff81486ea4 RBX: ffffea00025bd2c0 RCX: ffff88808d31e2c0
RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea00025bd2c0
RBP: ffffc90001f97730 R08: dffffc0000000000 R09: fffffbfff1287025
R10: fffffbfff1287025 R11: 0000000000000000 R12: ffff88809fc8f420
R13: dffffc0000000000 R14: 1ffff11013f91e84 R15: ffff8880a8475568
 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:debug_lockdep_rcu_enabled+0x8/0xe0 kernel/rcu/update.c:250
Code: 48 c7 c7 f4 d8 80 89 e8 66 f0 4e 00 eb d5 0f 1f 40 00 55 48 89 e5 e8 a7 b7 00 00 e8 a2 b8 00 00 5d c3 55 48 89 e5 41 57 41 56 <53> 48 c7 c0 1c 82 43 89 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90001f97940 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff02
RAX: 0000000000000000 RBX: ffff88808d31e2c0 RCX: ffff88808d31e2c0
RDX: dffffc0000000000 RSI: ffff88808d31eb78 RDI: 0000000000000286
RBP: ffffc90001f97950 R08: ffffffff81a5bf25 R09: ffffed1015d86fcd
R10: ffffed1015d86fcd R11: 0000000000000000 R12: 0000000000000000
R13: 1ffff11011a63c5a R14: ffff88808d31e2d0 R15: 000000000000008a
 ___might_sleep+0x66/0x5e0 kernel/sched/core.c:6765
 __might_sleep+0x8f/0x100 kernel/sched/core.c:6753
 remove_vma mm/mmap.c:181 [inline]
 exit_mmap+0x363/0x530 mm/mmap.c:3151
 __mmput+0x120/0x3a0 kernel/fork.c:1082
 mmput+0x5d/0x70 kernel/fork.c:1103
 exec_mmap fs/exec.c:1047 [inline]
 flush_old_exec+0x551/0x6d0 fs/exec.c:1280
 load_elf_binary+0x652/0x3670 fs/binfmt_elf.c:847
 search_binary_handler+0x1a5/0x660 fs/exec.c:1658
 exec_binprm fs/exec.c:1701 [inline]
 __do_execve_file+0x1573/0x1cd0 fs/exec.c:1821
 do_execveat_common fs/exec.c:1867 [inline]
 do_execve fs/exec.c:1884 [inline]
 __do_sys_execve fs/exec.c:1960 [inline]
 __se_sys_execve fs/exec.c:1955 [inline]
 __x64_sys_execve+0x94/0xb0 fs/exec.c:1955
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fc8baa08207
Code: Bad RIP value.
RSP: 002b:00007ffed9b77c98 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007fc8baa08207
RDX: 0000000001f78fd0 RSI: 00007ffed9b77d90 RDI: 00007ffed9b78da0
RBP: 0000000000625500 R08: 0000000000001fb0 R09: 0000000000001fb0
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000001f78fd0
R13: 0000000000000007 R14: 0000000001f69250 R15: 0000000000000005