rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=a62/1/0x4000000000000004 softirq=139905/139907 fqs=4 
rcu: 	 (t=10500 jiffies g=189025 q=249)
rcu: rcu_preempt kthread starved for 10492 jiffies! g189025 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29208    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 schedule_timeout+0x4cf/0xfe0 kernel/time/timer.c:1825
 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
NMI backtrace for cpu 0
CPU: 0 PID: 7692 Comm: syz-executor.1 Not tainted 4.19.154-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+0x1fc/0x2fe lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340
 print_cpu_stall kernel/rcu/tree.c:1478 [inline]
 check_cpu_stall kernel/rcu/tree.c:1550 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682
 update_process_times+0x2a/0xb0 kernel/time/timer.c:1650
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168
 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278
 __run_hrtimer kernel/time/hrtimer.c:1401 [inline]
 __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline]
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:31 [inline]
RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:22 [inline]
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:350 [inline]
RIP: 0010:rcu_is_watching+0x75/0xc0 kernel/rcu/tree.c:1025
Code: 48 89 ef e8 0d 61 47 00 48 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 04 <84> d2 75 24 8b 43 10 d1 e8 83 e0 01 65 ff 0d 58 5b ae 7e 74 07 48
RSP: 0018:ffff8880ba007ce0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000003 RBX: ffff8880ba022a80 RCX: ffffffff81538383
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880ba022a90
RBP: ffff8880ba022a90 R08: 0000000000000000 R09: ffffed1017404552
R10: ffff8880ba022a93 R11: 0000000000000000 R12: ffff8880ba007d48
R13: 1ffff11017400fa5 R14: 0000000000000000 R15: 0000000000000000
 rcu_read_lock_sched_held+0xc6/0x1d0 kernel/rcu/update.c:113
 trace_timer_expire_entry include/trace/events/timer.h:90 [inline]
 call_timer_fn+0x65d/0x700 kernel/time/timer.c:1337
 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375
 __run_timers kernel/time/timer.c:1703 [inline]
 run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1716
 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x215/0x260 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:544 [inline]
 smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:rcu_read_lock_sched include/linux/rcupdate.h:742 [inline]
RIP: 0010:__fd_install+0x46/0x610 fs/file.c:592
Code: e8 9f e5 95 ff e8 4a 08 b8 ff 45 31 c9 45 31 c0 31 d2 31 f6 b9 02 00 00 00 68 90 c6 ac 81 48 c7 c7 20 5a f8 89 e8 6a d5 9f ff <e8> 55 c8 a5 ff 31 ff 41 89 c5 89 c6 e8 89 09 b8 ff 45 85 ed 58 74
RSP: 0018:ffff88802d83fe28 EFLAGS: 00000296 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13e3001 RBX: 0000000000000007 RCX: c025915aa54b4ce2
RDX: dffffc0000000000 RSI: 000000001242afc4 RDI: 0000000000000286
RBP: ffff8880aa199000 R08: 00000000b824d8f9 R09: 0000000000000000
R10: ffff88803df12d88 R11: 000000007cd8b758 R12: ffff8880b34a7a40
R13: 1ffff11005b07fce R14: ffff88808ade9080 R15: dffffc0000000000
 sock_map_fd net/socket.c:419 [inline]
 __sys_socket+0x168/0x200 net/socket.c:1350
 __do_sys_socket net/socket.c:1355 [inline]
 __se_sys_socket net/socket.c:1353 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1353
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45deb9
Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb13c6d6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000034840 RCX: 000000000045deb9
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000002
RBP: 000000000118c008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bfd4
R13: 00007ffe0a53fdcf R14: 00007fb13c6d79c0 R15: 000000000118bfd4