INFO: rcu_preempt self-detected stall on CPU 0-...: (1 GPs behind) idle=136/140000000000002/0 softirq=152914/152919 fqs=11 (t=10500 jiffies g=48425 c=48424 q=68) rcu_preempt kthread starved for 7036 jiffies! g48425 c48424 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 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 NMI backtrace for cpu 0 CPU: 0 PID: 12652 Comm: syz-executor.3 Not tainted 4.14.161-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+0x142/0x197 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x141/0x189 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:158 [inline] rcu_dump_cpu_stacks+0x186/0x1d2 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+0x43d/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:161 tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1219 __run_hrtimer kernel/time/hrtimer.c:1220 [inline] __hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1284 hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1318 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:skb_is_gso include/linux/skbuff.h:4018 [inline] RIP: 0010:netif_skb_features+0x9f/0xa10 net/core/dev.c:2972 RSP: 0018:ffff8880aec07978 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: ffff8880a080a640 RCX: ffff8880a06cee00 RDX: 1ffff110132ca8ea RSI: ffff888099654680 RDI: ffff8880a080a70c RBP: ffff8880aec07a00 R08: ffffffff851fe712 R09: ffff8880a06cee98 R10: ffff8880a06cee78 R11: ffff8880a06ce580 R12: 000018444fdd59e9 R13: ffff888099654680 R14: 1ffff11015d80f33 R15: ffff888099654680 validate_xmit_skb+0x2d/0x9d0 net/core/dev.c:3067 __dev_queue_xmit+0x8d9/0x25e0 net/core/dev.c:3517 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 hsr_xmit net/hsr/hsr_forward.c:237 [inline] hsr_forward_do net/hsr/hsr_forward.c:295 [inline] hsr_forward_skb+0xbbe/0x1940 net/hsr/hsr_forward.c:373 send_hsr_supervision_frame+0x892/0xec0 net/hsr/hsr_device.c:319 hsr_announce+0xf5/0x340 net/hsr/hsr_device.c:348 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:__sanitizer_cov_trace_pc+0x31/0x60 kernel/kcov.c:85 RSP: 0018:ffff888090f4fb48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: ffff8880a06ce580 RBX: ffff88809b2467d0 RCX: dffffc0000000000 RDX: 0000000000000001 RSI: ffffffff81964df5 RDI: ffff88808bf84120 RBP: ffff888090f4fb48 R08: 1ffff1100d8962b8 R09: ffff88806c4b15c8 R10: ffffed100d8962b8 R11: ffff88806c4b15c7 R12: 0000000000000000 R13: ffff88808afa30d0 R14: 00000000000000b2 R15: ffff88808bf84100 dup_fd+0x435/0xa40 fs/file.c:344 copy_files kernel/fork.c:1304 [inline] copy_process.part.0+0x1b5a/0x6a70 kernel/fork.c:1759 copy_process kernel/fork.c:1586 [inline] _do_fork+0x19e/0xce0 kernel/fork.c:2070 SYSC_clone kernel/fork.c:2180 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2174 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45af49 RSP: 002b:00007fc174d1ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045af49 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000030020100 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc174d1f6d4 R13: 00000000004c1707 R14: 00000000004d6200 R15: 00000000ffffffff INFO: rcu_sched detected stalls on CPUs/tasks: 0-...: (1 GPs behind) idle=136/140000000000002/0 softirq=152914/152919 fqs=12 (detected by 1, t=10556 jiffies, g=25408, c=25407, q=3) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 15145 Comm: syz-executor.5 Not tainted 4.14.161-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a4a064c0 task.stack: ffff8880738a8000 RIP: 0010:rcu_is_watching+0x85/0xb0 kernel/rcu/tree.c:1133 RSP: 0018:ffff8880738af6e8 EFLAGS: 00000292 RAX: 0000000000000001 RBX: ffffea0001f7a2c0 RCX: 1ffffffff0f837ac RDX: 0000000000000000 RSI: ffffffff87049180 RDI: ffff8880aec2394c RBP: ffff8880738af6e8 R08: 0000000000000000 R09: ffff8880a4a06d88 R10: ffff8880a4a06d68 R11: ffff8880a4a064c0 R12: ffffea0001f7a2c0 R13: ffffea0001f7a2e0 R14: ffffea0001f7a2c0 R15: ffffea0001f7a2a0 FS: 0000000000000000(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001ac02b0 CR3: 00000000a84e2000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock include/linux/rcupdate.h:630 [inline] lock_page_memcg+0x128/0x220 mm/memcontrol.c:1669 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:3062 __mmput kernel/fork.c:930 [inline] mmput+0x114/0x440 kernel/fork.c:951 exit_mm kernel/exit.c:545 [inline] do_exit+0x6fc/0x2c80 kernel/exit.c:841 do_group_exit+0x111/0x330 kernel/exit.c:951 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: 0033:0x414d8a RSP: 002b:00007fff28d941a8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 0000000000003b2a RCX: 0000000000414d8a RDX: 0000000040000000 RSI: 00007fff28d941b4 RDI: ffffffffffffffff RBP: 00000000000000f8 R08: 0000000000003b29 R09: 0000000001852940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000416a50 R13: 00007fff28d94438 R14: 0000000000000000 R15: 0000000000000000 Code: 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 24 8b 43 0c d1 e8 83 e0 01 65 ff 0d 42 f1 b3 7e 74 07 48 83 c4 08 5b <5d> c3 e8 e8 45 b2 ff 48 83 c4 08 5b 5d c3 e8 28 e0 39 00 eb d5