rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (3 ticks this GP) idle=062/1/0x4000000000000000 softirq=9395/9395 fqs=0 (t=30229 jiffies g=3793 q=926) rcu: rcu_preempt kthread starved for 30229 jiffies! g3793 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:I stack:14552 pid: 10 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:3774 [inline] __schedule+0x404/0x890 kernel/sched/core.c:4523 schedule+0x38/0xe0 kernel/sched/core.c:4601 schedule_timeout+0x1be/0x2e0 kernel/time/timer.c:1871 rcu_gp_fqs_loop kernel/rcu/tree.c:1925 [inline] rcu_gp_kthread+0x707/0xc60 kernel/rcu/tree.c:2099 kthread+0x145/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 NMI backtrace for cpu 1 CPU: 1 PID: 7013 Comm: syz-executor.4 Not tainted 5.10.0-rc3-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+0xa3/0xc8 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.8+0x53/0x6d lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0xd5/0xf0 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0xa2/0xce kernel/rcu/tree_stall.h:318 print_cpu_stall kernel/rcu/tree_stall.h:551 [inline] check_cpu_stall kernel/rcu/tree_stall.h:625 [inline] rcu_pending kernel/rcu/tree.c:3694 [inline] rcu_sched_clock_irq.cold.93+0x61/0x52b kernel/rcu/tree.c:2567 update_process_times+0x50/0x80 kernel/time/timer.c:1709 tick_sched_handle.isra.24+0x1a/0x50 kernel/time/tick-sched.c:176 tick_sched_timer+0x6c/0x80 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1e3/0x4f0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0xf9/0x210 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x8e/0x290 arch/x86/kernel/apic/apic.c:1097 asm_call_irq_on_stack+0xf/0x20 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline] run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline] sysvec_apic_timer_interrupt+0xcc/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:653 [inline] RIP: 0010:console_unlock+0x4d7/0x620 kernel/printk/printk.c:2507 Code: 80 5b 2f 84 e8 6a 09 ff ff e8 75 1c 00 00 4d 85 e4 0f 85 ba 00 00 00 48 83 3d 1c 82 08 03 00 0f 84 27 01 00 00 48 89 df 57 9d <0f> 1f 44 00 00 8b 44 24 0c 85 c0 0f 84 c4 fb ff ff 31 d2 be ce 09 RSP: 0018:ffffc900010cb4b0 EFLAGS: 00000286 RAX: 000000000001e9cd RBX: 0000000000000286 RCX: 0000000000000006 RDX: 0000000000000000 RSI: ffffffff83f307db RDI: 0000000000000286 RBP: ffffffff84746708 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000001 R11: 615f6e616d746162 R12: 0000000000000200 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 vprintk_emit+0x156/0x380 kernel/printk/printk.c:2028 printk+0x53/0x6a kernel/printk/printk.c:2076 batadv_check_known_mac_addr.cold.25+0x14/0x19 net/batman-adv/hard-interface.c:518 batadv_hard_if_event+0xff/0x7a0 net/batman-adv/hard-interface.c:1047 notifier_call_chain+0x2f/0x90 kernel/notifier.c:83 call_netdevice_notifiers_extack net/core/dev.c:2047 [inline] call_netdevice_notifiers net/core/dev.c:2061 [inline] dev_set_mac_address+0xd9/0x110 net/core/dev.c:8684 do_setlink+0x1e4/0x10b0 net/core/rtnetlink.c:2661 __rtnl_newlink+0x538/0x8a0 net/core/rtnetlink.c:3374 rtnl_newlink+0x3e/0x60 net/core/rtnetlink.c:3500 rtnetlink_rcv_msg+0x173/0x480 net/core/rtnetlink.c:5562 netlink_rcv_skb+0x49/0xf0 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x248/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:671 __sys_sendto+0xec/0x160 net/socket.c:1992 __do_sys_sendto net/socket.c:2004 [inline] __se_sys_sendto net/socket.c:2000 [inline] __x64_sys_sendto+0x1f/0x30 net/socket.c:2000 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416c57 Code: 2c 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 81 19 00 00 c3 48 83 ec 08 e8 87 fa ff ff 48 89 04 24 49 89 ca b8 2c 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 cd fa ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffeb6f68720 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000016a3700 RCX: 0000000000416c57 RDX: 000000000000002c RSI: 00000000016a3750 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffeb6f68730 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00000000016a3750 R15: 0000000000000003