INFO: rcu_preempt self-detected stall on CPU 1-...: (1 GPs behind) idle=c9a/140000000000002/0 softirq=81142/81143 fqs=85 (t=10500 jiffies g=20345 c=20344 q=535) rcu_preempt kthread starved for 4169 jiffies! g20345 c20344 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_preempt R running task 29392 8 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746 rcu_gp_kthread+0xb8e/0x1ce0 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 1 CPU: 1 PID: 27960 Comm: syz-executor.3 Not tainted 4.14.177-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+0x13e/0x194 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline] rcu_dump_cpu_stacks+0x16d/0x1b8 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+0x490/0xdaa kernel/rcu/tree.c:2792 update_process_times+0x29/0x60 kernel/time/timer.c:1590 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x25c/0xbb0 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+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:unwind_get_return_address arch/x86/kernel/unwind_orc.c:255 [inline] RIP: 0010:unwind_get_return_address+0x3a/0xa0 arch/x86/kernel/unwind_orc.c:250 RSP: 0018:ffff8880aeb07880 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000001 RBX: ffff8880aeb07898 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff8880aeb077a0 RDI: ffff8880aeb07898 RBP: ffff8880aeb078e0 R08: 0000000000000001 R09: ffff888036c57958 R10: ffff8880aeb078cd R11: 0000000000058071 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8880a801a380 R15: ffff8880933e06bf __save_stack_trace+0x7b/0xd0 arch/x86/kernel/stacktrace.c:45 save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3696 __kmalloc_reserve.isra.0+0x35/0xd0 net/core/skbuff.c:137 __alloc_skb+0xca/0x4c0 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:980 [inline] ndisc_alloc_skb+0x134/0x320 net/ipv6/ndisc.c:402 ndisc_send_rs+0x2ea/0x630 net/ipv6/ndisc.c:661 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3765 call_timer_fn+0x14a/0x650 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+0x52a/0x1390 kernel/time/timer.c:1649 __do_softirq+0x254/0x9bf kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x15b/0x1a0 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+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:compound_head include/linux/page-flags.h:147 [inline] RIP: 0010:PageSwapBacked include/linux/page-flags.h:288 [inline] RIP: 0010:PageSwapCache include/linux/page-flags.h:333 [inline] RIP: 0010:free_swap_cache mm/swap_state.c:293 [inline] RIP: 0010:free_pages_and_swap_cache+0x9f/0x210 mm/swap_state.c:321 RSP: 0018:ffff888036c57780 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 1ffffd40002c088c RBX: ffff88804edb31b0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea0001604460 RBP: ffffea0001604440 R08: 1ffff11002204800 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffea0001604440 R14: ffffea0001604460 R15: dead000000000100 tlb_flush_mmu_free+0x73/0x130 mm/memory.c:260 zap_pte_range mm/memory.c:1409 [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+0x1308/0x1930 mm/memory.c:1515 unmap_single_vma+0x147/0x2b0 mm/memory.c:1560 unmap_vmas+0x9d/0x160 mm/memory.c:1590 exit_mmap+0x26d/0x4b0 mm/mmap.c:3056 __mmput kernel/fork.c:930 [inline] mmput+0x103/0x420 kernel/fork.c:951 exit_mm kernel/exit.c:545 [inline] do_exit+0x933/0x2b00 kernel/exit.c:845 do_group_exit+0x100/0x310 kernel/exit.c:955 get_signal+0x385/0x1ca0 kernel/signal.c:2423 do_signal+0x7c/0x1690 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x159/0x220 arch/x86/entry/common.c:160 prepare_exit_to_usermode+0x1af/0x210 arch/x86/entry/common.c:199 retint_user+0x8/0x18 RIP: 0033:0x45f66a RSP: 002b:00007fe4514edc58 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: 000000000078bf08 RCX: 000000000045f66a RDX: 0000000000000000 RSI: 00007fe4514edc60 RDI: 0000000000000001 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 0000000000000c12 R14: 00000000004ce3e1 R15: 000000000078bf0c