IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready INFO: rcu_preempt self-detected stall on CPU 0-...: (1 GPs behind) idle=2e6/140000000000002/0 softirq=98391/98399 fqs=24 (t=10500 jiffies g=27973 c=27972 q=1954) rcu_preempt kthread starved for 10442 jiffies! g27973 c27972 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 rcu_preempt R running task 30008 8 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x4af/0xe90 kernel/time/timer.c:1754 rcu_gp_kthread+0xc0a/0x1e60 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 NMI backtrace for cpu 0 CPU: 0 PID: 6653 Comm: syz-executor.0 Not tainted 4.14.193-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x17f lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline] rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1396 print_cpu_stall kernel/rcu/tree.c:1542 [inline] check_cpu_stall kernel/rcu/tree.c:1610 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0x464/0xd99 kernel/rcu/tree.c:2792 update_process_times+0x28/0xa0 kernel/time/timer.c:1591 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x92/0x200 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x30b/0xc80 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:queued_write_lock_slowpath+0x80/0x1d0 kernel/locking/qrwlock.c:130 RSP: 0018:ffff8880aea077a8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 00000000000000ff RBX: ffffffff887866f0 RCX: 0000000000005fb3 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff887866f0 RBP: ffffffff887866f4 R08: ffffffff8a0a8718 R09: 000000000004219e R10: ffff88803d0d8f68 R11: ffff88803d0d8640 R12: fffffbfff10f0cde R13: 0000000000000001 R14: 0000000000000000 R15: ffff888062c51b40 queued_write_lock include/asm-generic/qrwlock.h:134 [inline] do_raw_write_lock+0xc2/0x1d0 kernel/locking/spinlock_debug.c:203 __neigh_create+0x7be/0x19b0 net/core/neighbour.c:534 ip6_finish_output2+0x802/0x1f10 net/ipv6/ip6_output.c:117 ip6_finish_output+0x60c/0xaf0 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1c5/0x660 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:470 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ndisc_send_skb+0x82a/0x1390 net/ipv6/ndisc.c:483 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x249/0x550 net/ipv6/addrconf.c:3765 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319 __run_timers kernel/time/timer.c:1644 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1657 __do_softirq+0x254/0xa1d kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:200 RSP: 0018:ffff8880834ef6a8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fa2d23 RBX: ffff88803d0d8640 RCX: 1ffff11007a1b1dd RDX: dffffc0000000000 RSI: ffff88803d0d8ec8 RDI: ffff88803d0d8ec4 RBP: ffff8880aea2b580 R08: ffffffff8a09c508 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aea2b580 R13: ffff8880a9956340 R14: ffff8880687e6040 R15: ffff8880aea2bed0 finish_lock_switch kernel/sched/sched.h:1352 [inline] finish_task_switch+0x178/0x610 kernel/sched/core.c:2675 context_switch kernel/sched/core.c:2811 [inline] __schedule+0x893/0x1de0 kernel/sched/core.c:3384 preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:3611 retint_kernel+0x1b/0x2d RIP: 0010:shmem_getpage_gfp+0x1401/0x2810 mm/shmem.c:1892 RSP: 0018:ffff8880834ef8a0 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff02 RAX: 00000000000b5000 RBX: 0000000000000001 RCX: ffffc90006081000 RDX: 1ffff110122d18d1 RSI: ffffffff8175e82d RDI: ffff88809168c688 RBP: ffffea0000e32a00 R08: ffffffff8a09aeb8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff88803d0d8640 R14: ffff88809168c638 R15: 00000000000000b5 shmem_fault+0x1dd/0x5e0 mm/shmem.c:2012 __do_fault+0xfa/0x380 mm/memory.c:3223 do_read_fault mm/memory.c:3633 [inline] do_fault mm/memory.c:3759 [inline] handle_pte_fault mm/memory.c:3989 [inline] __handle_mm_fault+0x2497/0x4620 mm/memory.c:4113 handle_mm_fault+0x306/0x7a0 mm/memory.c:4150 faultin_page mm/gup.c:514 [inline] __get_user_pages+0x445/0x11d0 mm/gup.c:714 populate_vma_page_range+0x17b/0x210 mm/gup.c:1231 __mm_populate+0x195/0x2c0 mm/gup.c:1279 mm_populate include/linux/mm.h:2194 [inline] SYSC_remap_file_pages mm/mmap.c:2867 [inline] SyS_remap_file_pages+0x68f/0x6a0 mm/mmap.c:2777 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d239 RSP: 002b:00007f9ac0c1fc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d8 RAX: ffffffffffffffda RBX: 0000000000025f00 RCX: 000000000045d239 RDX: 0000000000000000 RSI: 0000000000201608 RDI: 00000000202ec000 RBP: 000000000118cf90 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffdfe008d4f R14: 00007f9ac0c209c0 R15: 000000000118cf4c INFO: rcu_sched detected stalls on CPUs/tasks: 0-...: (1 GPs behind) idle=2e6/140000000000002/0 softirq=98390/98399 fqs=24 (detected by 1, t=10572 jiffies, g=14016, c=14015, q=63) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6653 Comm: syz-executor.0 Not tainted 4.14.193-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88803d0d8640 task.stack: ffff8880834e8000 RIP: 0010:match_held_lock kernel/locking/lockdep.c:3559 [inline] RIP: 0010:__lock_is_held+0xbc/0x160 kernel/locking/lockdep.c:3818 RSP: 0018:ffff8880aea07100 EFLAGS: 00000006 RAX: 0000000000000000 RBX: ffff88803d0d8ec8 RCX: 0000000000000000 RDX: 1ffff11007a1b1d8 RSI: 00000000ffffffff RDI: ffff88803d0d8ec0 RBP: 0000000000000000 R08: ffffffff8a0af1c0 R09: 0000000000000005 R10: 0000000000000000 R11: ffff88803d0d8640 R12: ffff88803d0d8ec8 R13: dffffc0000000000 R14: ffffffff87d84de0 R15: ffff88803d0d8640 FS: 00007f9ac0c20700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe25b23e00 CR3: 000000009b3ae000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_is_held_type+0x10d/0x210 kernel/locking/lockdep.c:4036 lock_is_held include/linux/lockdep.h:437 [inline] rcu_read_lock_sched_held+0x16c/0x1d0 kernel/rcu/update.c:116 trace_hrtimer_cancel include/trace/events/timer.h:278 [inline] debug_deactivate kernel/time/hrtimer.c:454 [inline] __run_hrtimer kernel/time/hrtimer.c:1193 [inline] __hrtimer_run_queues+0x945/0xc80 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:unwind_next_frame+0x15/0x17d0 arch/x86/kernel/unwind_orc.c:330 RSP: 0018:ffff8880aea073d8 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: ffffffff818553cb RCX: 0000000000000001 RDX: ffff8880aea074b0 RSI: ffff8880aea07268 RDI: ffff8880aea07410 RBP: ffff8880aea07480 R08: 0000000000000001 R09: 0000000000000001 R10: ffff8880aea07490 R11: 0000000000000001 R12: ffff8880aea07498 R13: 0000000000000000 R14: ffff88812fe4ddc0 R15: ffff8880aea07410 __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x111/0x3c0 mm/slab.c:3550 kmem_cache_zalloc include/linux/slab.h:651 [inline] fill_pool lib/debugobjects.c:110 [inline] __debug_object_init+0x578/0x7a0 lib/debugobjects.c:341 debug_timer_init kernel/time/timer.c:688 [inline] debug_init kernel/time/timer.c:737 [inline] init_timer_key+0x2f/0x300 kernel/time/timer.c:781 neigh_alloc net/core/neighbour.c:336 [inline] __neigh_create+0x456/0x19b0 net/core/neighbour.c:499 ip6_finish_output2+0x802/0x1f10 net/ipv6/ip6_output.c:117 ip6_finish_output+0x60c/0xaf0 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1c5/0x660 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:470 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ndisc_send_skb+0x82a/0x1390 net/ipv6/ndisc.c:483 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x249/0x550 net/ipv6/addrconf.c:3765 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319 __run_timers kernel/time/timer.c:1644 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1657 __do_softirq+0x254/0xa1d kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:200 RSP: 0018:ffff8880834ef6a8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fa2d23 RBX: ffff88803d0d8640 RCX: 1ffff11007a1b1dd RDX: dffffc0000000000 RSI: ffff88803d0d8ec8 RDI: ffff88803d0d8ec4 RBP: ffff8880aea2b580 R08: ffffffff8a09c508 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aea2b580 R13: ffff8880a9956340 R14: ffff8880687e6040 R15: ffff8880aea2bed0 finish_lock_switch kernel/sched/sched.h:1352 [inline] finish_task_switch+0x178/0x610 kernel/sched/core.c:2675 context_switch kernel/sched/core.c:2811 [inline] __schedule+0x893/0x1de0 kernel/sched/core.c:3384 preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:3611 retint_kernel+0x1b/0x2d RIP: 0010:shmem_getpage_gfp+0x1401/0x2810 mm/shmem.c:1892 RSP: 0018:ffff8880834ef8a0 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff02 RAX: 00000000000b5000 RBX: 0000000000000001 RCX: ffffc90006081000 RDX: 1ffff110122d18d1 RSI: ffffffff8175e82d RDI: ffff88809168c688 RBP: ffffea0000e32a00 R08: ffffffff8a09aeb8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff88803d0d8640 R14: ffff88809168c638 R15: 00000000000000b5 shmem_fault+0x1dd/0x5e0 mm/shmem.c:2012 __do_fault+0xfa/0x380 mm/memory.c:3223 do_read_fault mm/memory.c:3633 [inline] do_fault mm/memory.c:3759 [inline] handle_pte_fault mm/memory.c:3989 [inline] __handle_mm_fault+0x2497/0x4620 mm/memory.c:4113 handle_mm_fault+0x306/0x7a0 mm/memory.c:4150 faultin_page mm/gup.c:514 [inline] __get_user_pages+0x445/0x11d0 mm/gup.c:714 populate_vma_page_range+0x17b/0x210 mm/gup.c:1231 __mm_populate+0x195/0x2c0 mm/gup.c:1279 mm_populate include/linux/mm.h:2194 [inline] SYSC_remap_file_pages mm/mmap.c:2867 [inline] SyS_remap_file_pages+0x68f/0x6a0 mm/mmap.c:2777 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d239 RSP: 002b:00007f9ac0c1fc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d8 RAX: ffffffffffffffda RBX: 0000000000025f00 RCX: 000000000045d239 RDX: 0000000000000000 RSI: 0000000000201608 RDI: 00000000202ec000 RBP: 000000000118cf90 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffdfe008d4f R14: 00007f9ac0c209c0 R15: 000000000118cf4c Code: 22 f0 ff 74 0f 4c 89 f6 48 89 df e8 5f f2 ff ff 85 c0 75 2f 83 c5 01 41 39 af 80 08 00 00 7e 70 48 63 c5 48 8d 04 80 49 8d 1c c4 <48> 8d 7b 10 48 89 f8 48 c1 e8 03 42 80 3c 28 00 75 6e 4c 3b 73 rcu_sched kthread starved for 10515 jiffies! g14016 c14015 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 rcu_sched R running task 30008 9 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x4af/0xe90 kernel/time/timer.c:1754 rcu_gp_kthread+0xc0a/0x1e60 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404