rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=3ea/1/0x4000000000000000 softirq=9058/9061 fqs=25 (t=10502 jiffies g=3481 q=107) rcu: rcu_preempt kthread starved for 10453 jiffies! g3481 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:14328 pid: 12 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x420/0x900 kernel/sched/core.c:5078 schedule+0x38/0xe0 kernel/sched/core.c:5157 schedule_timeout+0x1be/0x2e0 kernel/time/timer.c:1878 rcu_gp_fqs_loop kernel/rcu/tree.c:1940 [inline] rcu_gp_kthread+0x758/0xcc0 kernel/rcu/tree.c:2113 kthread+0x145/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 NMI backtrace for cpu 0 CPU: 0 PID: 7424 Comm: syz-executor.5 Not tainted 5.11.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xa3/0xc8 lib/dump_stack.c:120 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:337 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline] check_cpu_stall kernel/rcu/tree_stall.h:643 [inline] rcu_pending kernel/rcu/tree.c:3751 [inline] rcu_sched_clock_irq.cold.97+0x61/0x5eb kernel/rcu/tree.c:2580 update_process_times+0x8e/0xc0 kernel/time/timer.c:1782 tick_sched_handle.isra.21+0x1a/0x50 kernel/time/tick-sched.c:226 tick_sched_timer+0x6a/0x80 kernel/time/tick-sched.c:1369 __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:1085 [inline] __sysvec_apic_timer_interrupt+0x8e/0x290 arch/x86/kernel/apic/apic.c:1102 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:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:653 [inline] RIP: 0010:lock_acquire+0x133/0x420 kernel/locking/lockdep.c:5445 Code: b8 ff ff ff ff 65 0f c1 05 5a d1 dd 7e 83 f8 01 0f 85 e0 01 00 00 48 83 3d 11 1c 29 03 00 0f 84 f0 01 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 8b 44 24 30 65 48 33 04 25 28 00 00 00 0f 85 ca RSP: 0018:ffffc900020eb460 EFLAGS: 00000282 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 00000000ff4db14f RDX: 0ad0a1a03cd4bdcc RSI: ffffffff83ea4f84 RDI: 0000000000000282 RBP: 0000000000000000 R08: 00000000000052e9 R09: 0000000000000000 R10: 0000000000000001 R11: ffffc900020eb360 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88811253e4d8 R15: 0000000000000000 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:359 [inline] batadv_tt_local_purge+0x46/0xe0 net/batman-adv/translation-table.c:1365 batadv_tt_local_resize_to_mtu+0x3e/0x90 net/batman-adv/translation-table.c:3985 batadv_update_min_mtu net/batman-adv/hard-interface.c:628 [inline] batadv_hardif_activate_interface.part.11.cold.21+0x2f/0x78 net/batman-adv/hard-interface.c:655 batadv_hardif_activate_interface include/linux/refcount.h:199 [inline] batadv_hardif_enable_interface+0x27e/0x2c0 net/batman-adv/hard-interface.c:794 batadv_softif_slave_add+0x3c/0x90 net/batman-adv/soft-interface.c:858 do_setlink+0x327/0x10c0 net/core/rtnetlink.c:2715 __rtnl_newlink+0x538/0x890 net/core/rtnetlink.c:3376 rtnl_newlink+0x3e/0x60 net/core/rtnetlink.c:3491 rtnetlink_rcv_msg+0x173/0x480 net/core/rtnetlink.c:5553 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:652 [inline] sock_sendmsg+0x2b/0x40 net/socket.c:672 ____sys_sendmsg+0x1ed/0x230 net/socket.c:2345 ___sys_sendmsg+0x77/0xb0 net/socket.c:2399 __sys_sendmsg+0x52/0xa0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c369 Code: 8d 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 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f42a2e03c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002b740 RCX: 000000000045c369 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffe6c30433f R14: 00007f42a2e049c0 R15: 000000000078bf0c