batman_adv: batadv0: Interface activated: batadv_slave_1 IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=2574, c=2573, q=1230) All QSes seen, last rcu_preempt kthread activity 10495 (4295065377-4295054882), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.4 R running task 28080 7907 7650 0x8000000c Call Trace: sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x2f0/0x351 kernel/sched/core.c:5143 print_other_cpu_stall kernel/rcu/tree.c:1501 [inline] check_cpu_stall kernel/rcu/tree.c:1616 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0xcb1/0xd0a kernel/rcu/tree.c:2792 update_process_times+0x31/0x70 kernel/time/timer.c:1590 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:165 tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x11c/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:trace_kmalloc include/trace/events/kmem.h:46 [inline] RIP: 0010:trace_kmalloc include/trace/events/kmem.h:46 [inline] RIP: 0010:kmem_cache_alloc_trace+0x61e/0x790 mm/slab.c:3619 RSP: 0018:ffff8880aed07a10 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000001 RBX: 0000000000000080 RCX: 1ffffffff1067f7c RDX: 0000000000000000 RSI: ffff88808a64e1c0 RDI: ffff888086dd4bfc RBP: ffff8880aed07a80 R08: 00000000ebef36e9 R09: 0000000000000003 R10: 0000000000000000 R11: ffff888086dd4380 R12: ffff88808e175300 R13: ffffffff85216efd R14: ffff8880aa8004c0 R15: 0000000001080020 kmalloc include/linux/slab.h:488 [inline] dst_cow_metrics_generic+0x4d/0x140 net/core/dst.c:210 ipv6_cow_metrics+0x78/0x180 net/ipv6/route.c:196 dst_metrics_write_ptr include/net/dst.h:146 [inline] dst_metric_set include/net/dst.h:207 [inline] icmp6_dst_alloc+0x3f6/0x580 net/ipv6/route.c:1780 ndisc_send_skb+0xc0f/0x11e0 net/ipv6/ndisc.c:463 ndisc_send_rs+0x12b/0x670 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3757 call_timer_fn+0x161/0x670 kernel/time/timer.c:1279 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x5b7/0x1520 kernel/time/timer.c:1649 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x160/0x1b0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:debug_lockdep_rcu_enabled+0x0/0xa0 kernel/rcu/update.c:299 RSP: 0018:ffff88808e9b76e8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fe2d29 RBX: ffffea00024bacc0 RCX: 0000000090259772 RDX: dffffc0000000000 RSI: ffff888086dd4c28 RDI: 0000000000000286 RBP: ffff88808e9b7730 R08: 0000000000000000 R09: ffff888086dd4c48 R10: ffff888086dd4c28 R11: ffff888086dd4380 R12: ffffea00024bacc0 R13: ffffea00024bace0 R14: ffffea00024bacc0 R15: ffffea00024baca0 page_remove_file_rmap mm/rmap.c:1211 [inline] page_remove_rmap+0x19f/0x940 mm/rmap.c:1296 zap_pte_range mm/memory.c:1342 [inline] zap_pmd_range mm/memory.c:1444 [inline] zap_pud_range mm/memory.c:1473 [inline] zap_p4d_range mm/memory.c:1494 [inline] unmap_page_range+0xabd/0x19f0 mm/memory.c:1515 unmap_single_vma+0x15d/0x2c0 mm/memory.c:1560 unmap_vmas+0xac/0x170 mm/memory.c:1590 exit_mmap+0x285/0x4e0 mm/mmap.c:3056 __mmput kernel/fork.c:930 [inline] mmput+0x114/0x440 kernel/fork.c:951 exit_mm kernel/exit.c:545 [inline] do_exit+0x952/0x2cd0 kernel/exit.c:845 do_group_exit+0x111/0x330 kernel/exit.c:955 get_signal+0x381/0x1cd0 kernel/signal.c:2413 do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45b349 RSP: 002b:00007f033e638cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000075bf28 RCX: 000000000045b349 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000075bf2c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf2c R13: 00007fff87479a9f R14: 00007f033e6399c0 R15: 000000000075bf2c rcu_preempt kthread starved for 10545 jiffies! g2574 c2573 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_preempt R running task 29776 8 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384 schedule+0x92/0x1c0 kernel/sched/core.c:3428 schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1746 rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404