rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=0a6/1/0x4000000000000004 softirq=116386/116387 fqs=1 rcu: (t=10500 jiffies g=143809 q=220) rcu: rcu_preempt kthread starved for 10498 jiffies! g143809 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29072 10 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x4d1/0xf20 kernel/time/timer.c:1806 rcu_gp_kthread+0xcee/0x2060 kernel/rcu/tree.c:2202 kthread+0x34a/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 NMI backtrace for cpu 0 CPU: 0 PID: 8991 Comm: syz-executor.0 Not tainted 4.19.107-syzkaller #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+0x188/0x20d 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+0x170/0x1bb 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+0x634/0xddc kernel/rcu/tree.c:2682 update_process_times+0x2a/0x70 kernel/time/timer.c:1638 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x2fc/0xd50 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x312/0x770 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:893 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:kmem_cache_free+0xa4/0x260 mm/slab.c:3766 Code: e8 31 2f 00 00 84 c0 74 76 41 f7 c4 00 02 00 00 74 4e e8 0f 82 cf ff 48 83 3d af 2c 15 07 00 0f 84 a8 01 00 00 4c 89 e7 57 9d <0f> 1f 44 00 00 4c 8b 64 24 20 0f 1f 44 00 00 65 8b 05 36 57 64 7e RSP: 0018:ffff8880ae607ad8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff8880a4d75b80 RCX: 1ffff1104272b59e RDX: 0000000000000000 RSI: ffff88821395acf8 RDI: 0000000000000282 RBP: ffff8880a9fb5ac0 R08: ffff88821395a400 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000282 R13: ffffffff85967991 R14: ffffffff859753af R15: ffffffff8962fdf0 kfree_skbmem+0xc1/0x140 net/core/skbuff.c:586 __kfree_skb net/core/skbuff.c:646 [inline] kfree_skb net/core/skbuff.c:663 [inline] kfree_skb+0xe9/0x390 net/core/skbuff.c:657 kfree_skb_list+0x3f/0x60 net/core/skbuff.c:672 __dev_xmit_skb net/core/dev.c:3508 [inline] __dev_queue_xmit+0x2b8e/0x3040 net/core/dev.c:3812 mrp_queue_xmit net/802/mrp.c:354 [inline] mrp_join_timer+0x52/0x80 net/802/mrp.c:598 call_timer_fn+0x177/0x700 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x5d0/0x1540 kernel/time/timer.c:1697 __do_softirq+0x26c/0x93c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x17b/0x1c0 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:893 RIP: 0010:batadv_hardif_get_by_netdev+0x151/0x3e0 net/batman-adv/hard-interface.c:83 Code: 6d 02 00 00 4d 8b 24 24 49 81 fc 60 39 2c 8c 0f 84 88 01 00 00 e8 1f be 64 fa 49 8d 7c 24 20 48 89 f8 48 c1 e8 03 80 3c 28 00 <0f> 85 4e 02 00 00 4d 39 74 24 20 75 b7 e8 fd bd 64 fa 4d 8d 6c 24 RSP: 0018:ffff888212b3ebb8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff110078d3924 RBX: 0000000000000001 RCX: ffffc90005e86000 RDX: 000000000002ce2c RSI: ffffffff8702daa1 RDI: ffff88803c69c920 RBP: dffffc0000000000 R08: ffff88821395a400 R09: ffffed1015cc4733 R10: ffffed1015cc4732 R11: ffff8880ae623993 R12: ffff88803c69c900 R13: 0000000000000000 R14: ffff888092f04440 R15: ffffffff89824800 batadv_hard_if_event+0x10a/0x14f0 net/batman-adv/hard-interface.c:1035 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93 netdev_state_change net/core/dev.c:1353 [inline] netdev_state_change+0x10d/0x140 net/core/dev.c:1346 do_setlink+0x2b65/0x3510 net/core/rtnetlink.c:2661 rtnl_group_changelink net/core/rtnetlink.c:2925 [inline] rtnl_newlink+0xc7e/0x1440 net/core/rtnetlink.c:3083 rtnetlink_rcv_msg+0x453/0xaf0 net/core/rtnetlink.c:4777 netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2454 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x80b/0xcd0 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0xec/0x1b0 net/socket.c:2153 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c479 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7b64922c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7b649236d4 RCX: 000000000045c479 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000004 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009f9 R14: 00000000004cc71a R15: 000000000076bf2c IPv6: ADDRCONF(NETDEV_CHANGE): tunl0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): gre0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): gretap0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): erspan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): ip_vti0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): ip6_vti0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready