rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=34e/1/0x4000000000000004 softirq=85910/85913 fqs=2 (t=10501 jiffies g=119429 q=130) rcu: rcu_preempt kthread starved for 10498 jiffies! g119429 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29080 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x877/0xc50 kernel/sched/core.c:3880 schedule+0x131/0x1e0 kernel/sched/core.c:3947 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1807 rcu_gp_fqs_loop kernel/rcu/tree.c:1611 [inline] rcu_gp_kthread+0xef8/0x1790 kernel/rcu/tree.c:1768 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: 12777 Comm: syz-executor.2 Not tainted 5.3.0-rc8+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x2f8 lib/dump_stack.c:113 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:2736 [inline] rcu_sched_clock_irq+0xb95/0x16d0 kernel/rcu/tree.c:2183 update_process_times+0x134/0x190 kernel/time/timer.c:1639 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1296 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x403/0x850 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1106 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1131 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x5f/0x80 kernel/locking/spinlock.c:199 Code: 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 90 87 8a 88 e8 c2 94 30 fa 48 83 3d fa 93 0e 01 00 74 26 fb 66 0f 1f 44 00 00 01 00 00 00 e8 a7 8f d4 f9 65 8b 05 1c 0a 86 78 85 c0 74 03 5b RSP: 0018:ffff8880aea09da8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11150f2 RBX: ffff8880aea24a80 RCX: dffffc0000000000 RDX: 0000000000000101 RSI: ffffffff8163b6be RDI: ffffffff877bf367 RBP: ffff8880aea09db0 R08: ffffffff81790e54 R09: ffffed1015d44951 R10: ffffed1015d44951 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff888090874340 R14: ffff8880aea24ab8 R15: ffffffff860cc380 expire_timers kernel/time/timer.c:1365 [inline] __run_timers+0x78e/0x970 kernel/time/timer.c:1685 run_timer_softirq+0x4a/0x90 kernel/time/timer.c:1698 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:778 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x227/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1133 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:__write_once_size include/linux/compiler.h:226 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x45/0x50 kernel/kcov.c:110 Code: 2c 8b 91 f0 12 00 00 83 fa 02 75 21 48 8b 91 f8 12 00 00 48 8b 32 48 8d 7e 01 8b 89 f4 12 00 00 48 39 cf 73 08 48 89 44 f2 08 <48> 89 3a c3 0f 1f 80 00 00 00 00 4c 8b 04 24 65 48 8b 04 25 c0 fd RSP: 0018:ffff8881fe1e6ec8 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff13 RAX: ffffffff8777890d RBX: 0000000000000065 RCX: 0000000000040000 RDX: ffffc9000a377000 RSI: 00000000000052c4 RDI: 00000000000052c5 RBP: ffff8881fe1e6f50 R08: 0000000000000001 R09: ffffffff877788fe R10: ffff8880a8f44000 R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff8881fe1e6f18 R15: ffff88820587c481 vsnprintf+0x103/0x1c00 lib/vsprintf.c:2455 snprintf+0x6f/0x90 lib/vsprintf.c:2636 __dev_alloc_name net/core/dev.c:1090 [inline] dev_alloc_name_ns+0x4f1/0x750 net/core/dev.c:1118 dev_get_valid_name+0x1e5/0x350 net/core/dev.c:1153 register_netdevice+0x2ab/0x13b0 net/core/dev.c:8652 veth_newlink+0x603/0xa40 drivers/net/veth.c:1302 __rtnl_newlink net/core/rtnetlink.c:3196 [inline] rtnl_newlink+0x13a6/0x1af0 net/core/rtnetlink.c:3254 rtnetlink_rcv_msg+0x889/0xd40 net/core/rtnetlink.c:5223 netlink_rcv_skb+0x19e/0x3d0 net/netlink/af_netlink.c:2477 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5241 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x787/0x900 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x993/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] ___sys_sendmsg+0x60d/0x910 net/socket.c:2311 __sys_sendmsg net/socket.c:2356 [inline] __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x17c/0x200 net/socket.c:2363 do_syscall_64+0xfe/0x140 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:00007fe33101dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004598e9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000008 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe33101e6d4 R13: 00000000004c77ea R14: 00000000004dd080 R15: 00000000ffffffff