rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=1d6/1/0x4000000000000004 softirq=201730/201732 fqs=1 
	(t=10500 jiffies g=265701 q=162)
rcu: rcu_preempt kthread starved for 10498 jiffies! g265701 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29256    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x755/0x1580 kernel/sched/core.c:3880
 schedule+0xd9/0x260 kernel/sched/core.c:3947
 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807
 rcu_gp_fqs_loop kernel/rcu/tree.c:1611 [inline]
 rcu_gp_kthread+0x9b2/0x18c0 kernel/rcu/tree.c:1768
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 8567 Comm: syz-executor.4 Not tainted 5.3.0-rc8+ #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+0x172/0x1f0 lib/dump_stack.c:113
 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:2736 [inline]
 rcu_sched_clock_irq.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183
 update_process_times+0x32/0x80 kernel/time/timer.c:1639
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 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:830
RIP: 0010:pie_timer+0x5d/0x830 net/sched/sch_pie.c:447
Code: 3c 02 00 0f 85 ac 07 00 00 48 8b 45 d0 48 8b 58 48 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 40 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 7b 07 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 40 49 8d
RSP: 0018:ffff8880ae909c78 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff8880641c4940 RCX: ffffffff81624d35
RDX: 1ffff1100c838930 RSI: ffffffff85c6879d RDI: ffff8880641c4980
RBP: ffff8880ae909d00 R08: ffff8880a0118380 R09: fffffbfff134afb0
R10: fffffbfff134afaf R11: ffffffff89a57d7f R12: 0000000000000101
R13: ffff8880ae909db0 R14: 0000000000000000 R15: dffffc0000000000
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322
 expire_timers kernel/time/timer.c:1366 [inline]
 __run_timers kernel/time/timer.c:1685 [inline]
 __run_timers kernel/time/timer.c:1653 [inline]
 run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:537 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
RIP: 0010:console_unlock+0xbc7/0xf10 kernel/printk/printk.c:2471
Code: d2 88 48 c1 e8 03 42 80 3c 30 00 0f 85 e4 02 00 00 48 83 3d 5a 30 77 07 00 0f 84 91 01 00 00 e8 2f b1 16 00 48 8b 7d 98 57 9d <0f> 1f 44 00 00 e9 6d ff ff ff e8 1a b1 16 00 48 8b 7d 08 c7 05 9c
RSP: 0018:ffff8882153d7368 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc9000e7a9000
RDX: 000000000000980b RSI: ffffffff815bc401 RDI: 0000000000000212
RBP: ffff8882153d73f0 R08: ffff8880a0118380 R09: fffffbfff134afb0
R10: fffffbfff134afaf R11: ffffffff89a57d7f R12: 0000000000000000
R13: ffffffff84338a50 R14: dffffc0000000000 R15: ffffffff893ca810
 vprintk_emit+0x2a0/0x700 kernel/printk/printk.c:1986
 vprintk_default+0x28/0x30 kernel/printk/printk.c:2013
 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:386
 printk+0xba/0xed kernel/printk/printk.c:2046
 xt_check_target.cold+0x20f/0x31c net/netfilter/x_tables.c:995
 ebt_check_watcher net/bridge/netfilter/ebtables.c:416 [inline]
 ebt_check_entry+0xd54/0x1b70 net/bridge/netfilter/ebtables.c:704
 translate_table+0xce7/0x1e50 net/bridge/netfilter/ebtables.c:935
 do_replace_finish+0x9a1/0x21f0 net/bridge/netfilter/ebtables.c:991
 do_replace+0x382/0x420 net/bridge/netfilter/ebtables.c:1118
 do_ebt_set_ctl+0xe6/0x110 net/bridge/netfilter/ebtables.c:1469
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x77/0xd0 net/netfilter/nf_sockopt.c:115
 ip_setsockopt net/ipv4/ip_sockglue.c:1260 [inline]
 ip_setsockopt+0xdf/0x100 net/ipv4/ip_sockglue.c:1240
 udp_setsockopt+0x68/0xb0 net/ipv4/udp.c:2605
 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3139
 __sys_setsockopt+0x261/0x4c0 net/socket.c:2084
 __do_sys_setsockopt net/socket.c:2100 [inline]
 __se_sys_setsockopt net/socket.c:2097 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2097
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4598e9
Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3158935c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004598e9
RDX: 0000000000000080 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 000000000075bf20 R08: 0000000000000608 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 00007f31589366d4
R13: 00000000004c79ee R14: 00000000004dd4d0 R15: 00000000ffffffff
NMI backtrace for cpu 1
CPU: 1 PID: 8567 Comm: syz-executor.4 Not tainted 5.3.0-rc8+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__hlist_del include/linux/list.h:764 [inline]
RIP: 0010:detach_timer kernel/time/timer.c:811 [inline]
RIP: 0010:expire_timers kernel/time/timer.c:1356 [inline]
RIP: 0010:__run_timers kernel/time/timer.c:1685 [inline]
RIP: 0010:__run_timers kernel/time/timer.c:1653 [inline]
RIP: 0010:run_timer_softirq+0x5cf/0x17a0 kernel/time/timer.c:1698
Code: 85 db 48 89 1a 48 89 95 e0 fe ff ff 74 26 e8 18 f1 0f 00 48 8d 7b 08 48 8b 95 e0 fe ff ff 48 89 f9 48 c1 e9 03 42 80 3c 39 00 <0f> 85 05 0f 00 00 48 89 53 08 e8 f2 f0 0f 00 4c 89 e8 48 c1 e8 03
RSP: 0018:ffff8880ae909de8 EFLAGS: 00000046
RAX: ffff8880a0118380 RBX: ffff88808ce7a800 RCX: 1ffff110119cf501
RDX: ffff8880ae909e60 RSI: ffffffff81628418 RDI: ffff88808ce7a808
RBP: ffff8880ae909f08 R08: ffff8880a0118380 R09: fffffbfff134afb0
R10: fffffbfff134afaf R11: ffffffff89a57d7f R12: ffff888056e19540
R13: ffff888056e19548 R14: ffff8880ae924c00 R15: dffffc0000000000
FS:  00007f3158936700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d424000 CR3: 0000000216bd7000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:537 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
RIP: 0010:console_unlock+0xbc7/0xf10 kernel/printk/printk.c:2471
Code: d2 88 48 c1 e8 03 42 80 3c 30 00 0f 85 e4 02 00 00 48 83 3d 5a 30 77 07 00 0f 84 91 01 00 00 e8 2f b1 16 00 48 8b 7d 98 57 9d <0f> 1f 44 00 00 e9 6d ff ff ff e8 1a b1 16 00 48 8b 7d 08 c7 05 9c
RSP: 0018:ffff8882153d7368 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc9000e7a9000
RDX: 000000000000980b RSI: ffffffff815bc401 RDI: 0000000000000212
RBP: ffff8882153d73f0 R08: ffff8880a0118380 R09: fffffbfff134afb0
R10: fffffbfff134afaf R11: ffffffff89a57d7f R12: 0000000000000000
R13: ffffffff84338a50 R14: dffffc0000000000 R15: ffffffff893ca810
 vprintk_emit+0x2a0/0x700 kernel/printk/printk.c:1986
 vprintk_default+0x28/0x30 kernel/printk/printk.c:2013
 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:386
 printk+0xba/0xed kernel/printk/printk.c:2046
 xt_check_target.cold+0x20f/0x31c net/netfilter/x_tables.c:995
 ebt_check_watcher net/bridge/netfilter/ebtables.c:416 [inline]
 ebt_check_entry+0xd54/0x1b70 net/bridge/netfilter/ebtables.c:704
 translate_table+0xce7/0x1e50 net/bridge/netfilter/ebtables.c:935
 do_replace_finish+0x9a1/0x21f0 net/bridge/netfilter/ebtables.c:991
 do_replace+0x382/0x420 net/bridge/netfilter/ebtables.c:1118
 do_ebt_set_ctl+0xe6/0x110 net/bridge/netfilter/ebtables.c:1469
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x77/0xd0 net/netfilter/nf_sockopt.c:115
 ip_setsockopt net/ipv4/ip_sockglue.c:1260 [inline]
 ip_setsockopt+0xdf/0x100 net/ipv4/ip_sockglue.c:1240
 udp_setsockopt+0x68/0xb0 net/ipv4/udp.c:2605
 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3139
 __sys_setsockopt+0x261/0x4c0 net/socket.c:2084
 __do_sys_setsockopt net/socket.c:2100 [inline]
 __se_sys_setsockopt net/socket.c:2097 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2097
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4598e9
Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3158935c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004598e9
RDX: 0000000000000080 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 000000000075bf20 R08: 0000000000000608 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 00007f31589366d4
R13: 00000000004c79ee R14: 00000000004dd4d0 R15: 00000000ffffffff