rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=c1e/1/0x4000000000000004 softirq=26441/26442 fqs=5237 (t=10500 jiffies g=35173 q=762) NMI backtrace for cpu 0 CPU: 0 PID: 15988 Comm: syz-executor.1 Not tainted 5.3.0-rc7+ #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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2736 [inline] rcu_sched_clock_irq.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183 update_process_times+0x32/0x80 kernel/time/timer.c:1639 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1106 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1131 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:__list_add include/linux/list.h:65 [inline] RIP: 0010:list_add_tail include/linux/list.h:93 [inline] RIP: 0010:list_move_tail include/linux/list.h:214 [inline] RIP: 0010:hhf_dequeue+0x6ba/0xa20 net/sched/sch_hhf.c:439 Code: e8 03 42 80 3c 20 00 0f 85 08 03 00 00 48 89 d8 49 89 9d 98 03 00 00 48 c1 e8 03 42 80 3c 20 00 0f 85 b4 02 00 00 48 8b 45 c8 <48> 8d 7b 08 48 89 03 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 8d RSP: 0018:ffff8880ae809488 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff888095f41e90 RBX: ffff888095f41df8 RCX: ffffffff85c7e4d9 RDX: 0000000000000100 RSI: ffffffff85c7e4eb RDI: 0000000000000001 RBP: ffff8880ae8094d8 R08: ffff888063fa6600 R09: fffffbfff14e9755 R10: ffff888063fa6f80 R11: ffff888063fa6600 R12: dffffc0000000000 R13: ffff888095f41b00 R14: ffff888095f41e98 R15: ffff888095f41e90 dequeue_skb net/sched/sch_generic.c:258 [inline] qdisc_restart net/sched/sch_generic.c:361 [inline] __qdisc_run+0x1e7/0x19d0 net/sched/sch_generic.c:379 __dev_xmit_skb net/core/dev.c:3533 [inline] __dev_queue_xmit+0x16f1/0x3650 net/core/dev.c:3838 dev_queue_xmit+0x18/0x20 net/core/dev.c:3902 neigh_resolve_output net/core/neighbour.c:1490 [inline] neigh_resolve_output+0x5a5/0x970 net/core/neighbour.c:1470 neigh_output include/net/neighbour.h:511 [inline] ip6_finish_output2+0x1034/0x2520 net/ipv6/ip6_output.c:116 __ip6_finish_output+0x444/0xa50 net/ipv6/ip6_output.c:142 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x235/0x7c0 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ndisc_send_skb+0xf29/0x1450 net/ipv6/ndisc.c:505 ndisc_send_rs+0x134/0x6d0 net/ipv6/ndisc.c:699 addrconf_rs_timer+0x30f/0x680 net/ipv6/addrconf.c:3879 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1133 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:get_page_from_freelist+0x508/0x39d0 mm/page_alloc.c:3580 Code: 48 89 f9 48 c1 e9 03 0f b6 0c 01 48 89 f8 83 e0 07 83 c0 03 38 c8 7c 08 84 c9 0f 85 68 2e 00 00 48 8b 85 68 ff ff ff 48 85 d2 <8b> 70 1c 48 8b 85 48 ff ff ff 4c 8d 60 10 0f 85 eb 19 00 00 48 8d RSP: 0018:ffff888061eaf160 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: ffff888061eaf368 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888063fa76b0 RSI: 0000000000000000 RDI: ffff888061eaf384 RBP: ffff888061eaf2f8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88812fffd2c7 R12: 0000000000000003 R13: 0000000000000002 R14: 0000000000000002 R15: 0000000000000000 __alloc_pages_nodemask+0x2d0/0x900 mm/page_alloc.c:4714 alloc_pages_vma+0x1bc/0x3f0 mm/mempolicy.c:2116 shmem_alloc_page+0xbd/0x180 mm/shmem.c:1483 shmem_alloc_and_acct_page+0x165/0x990 mm/shmem.c:1508 shmem_getpage_gfp+0x598/0x2680 mm/shmem.c:1822 shmem_fault+0x22a/0x7b0 mm/shmem.c:2050 __do_fault+0x111/0x540 mm/memory.c:3083 do_read_fault mm/memory.c:3480 [inline] do_fault mm/memory.c:3609 [inline] handle_pte_fault mm/memory.c:3840 [inline] __handle_mm_fault+0x2cb8/0x3f20 mm/memory.c:3964 handle_mm_fault+0x1b5/0x6b0 mm/memory.c:4001 faultin_page mm/gup.c:651 [inline] __get_user_pages+0x7d4/0x1b30 mm/gup.c:854 populate_vma_page_range+0x20d/0x2a0 mm/gup.c:1230 __mm_populate+0x204/0x380 mm/gup.c:1278 mm_populate include/linux/mm.h:2383 [inline] vm_mmap_pgoff+0x213/0x230 mm/util.c:396 ksys_mmap_pgoff+0xf7/0x630 mm/mmap.c:1611 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4598e9 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6c9da60c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004598e9 RDX: 0000000000000006 RSI: 0000000000b36000 RDI: 0000000020000000 RBP: 000000000075bf20 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 00007f6c9da616d4 R13: 00000000004c5db4 R14: 00000000004da890 R15: 00000000ffffffff