!: renamed from ip6tnl0 INFO: rcu_sched self-detected stall on CPU INFO: rcu_sched detected stalls on CPUs/tasks: 1-...!: (124999 ticks this GP) idle=292/1/4611686018427387906 softirq=59407/59407 fqs=29 (detected by 0, t=125002 jiffies, g=34123, c=34122, q=203) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 16267 Comm: syz-executor7 Not tainted 4.15.0-rc1-next-20171130+ #56 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: 00000000743c185c task.stack: 000000007f913670 RIP: 0010:inb arch/x86/include/asm/io.h:348 [inline] RIP: 0010:io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:434 RSP: 0018:ffff8801db506ff8 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000 RDX: 00000000000003fd RSI: 0000000000000005 RDI: ffffffff87cf0a40 RBP: ffff8801db507008 R08: 0000000000000003 R09: 000000000000000c R10: 0000000000000000 R11: ffffffff8748cd60 R12: ffffffff87cf0a00 R13: 0000000000000020 R14: fffffbfff0f9e187 R15: fffffbfff0f9e14a FS: 00007f3d323e8700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020fd8000 CR3: 00000001cfe5b000 CR4: 00000000001426e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: serial_in drivers/tty/serial/8250/8250.h:111 [inline] wait_for_xmitr+0x93/0x1e0 drivers/tty/serial/8250/8250_port.c:2033 serial8250_console_putchar+0x1f/0x60 drivers/tty/serial/8250/8250_port.c:3170 uart_console_write+0xac/0xe0 drivers/tty/serial/serial_core.c:1858 serial8250_console_write+0x647/0xa20 drivers/tty/serial/8250/8250_port.c:3236 univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:590 call_console_drivers kernel/printk/printk.c:1574 [inline] console_unlock+0x788/0xd70 kernel/printk/printk.c:2233 vprintk_emit+0x4ad/0x590 kernel/printk/printk.c:1757 vprintk_default+0x28/0x30 kernel/printk/printk.c:1796 vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379 printk+0xaa/0xca kernel/printk/printk.c:1829 print_cpu_stall_info_begin kernel/rcu/tree_plugin.h:1656 [inline] print_cpu_stall kernel/rcu/tree.c:1510 [inline] check_cpu_stall.isra.64+0x845/0x15b0 kernel/rcu/tree.c:1592 __rcu_pending kernel/rcu/tree.c:3361 [inline] rcu_pending kernel/rcu/tree.c:3423 [inline] rcu_check_callbacks+0x238/0xd20 kernel/rcu/tree.c:2763 update_process_times+0x30/0x60 kernel/time/timer.c:1640 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162 tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1166 __run_hrtimer kernel/time/hrtimer.c:1348 [inline] __hrtimer_run_queues+0x373/0xea0 kernel/time/hrtimer.c:1411 hrtimer_interrupt+0x2a5/0x6f0 kernel/time/hrtimer.c:1469 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:907 RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:94 RSP: 0018:ffff8801d8df7b38 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff11 RAX: 0000000000000ed7 RBX: ffffc9000134e060 RCX: ffffffff8286e9bc RDX: 0000000000010000 RSI: ffffc90001959000 RDI: ffffc9000134f260 RBP: ffff8801d8df7b88 R08: 0000000000000001 R09: 0000000000000004 R10: 0000000000000000 R11: ffffffff8748cd60 R12: ffffc9000134d000 R13: 000000027f725ed7 R14: 0000000020f76fff R15: ffff8801d7f16df8 tty_ioctl+0x32e/0x15f0 drivers/tty/tty_io.c:2638 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x4529d9 RSP: 002b:00007f3d323e7c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9 RDX: 0000000020f76fff RSI: 000000000000541b RDI: 0000000000000015 RBP: 00000000000005ac R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f58c0 R13: 00000000ffffffff R14: 00007f3d323e86d4 R15: 0000000000000000 Code: 24 d9 00 00 00 49 8d 7c 24 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 17 41 03 5c 24 40 89 da ec <5b> 0f b6 c0 41 5c 5d c3 e8 88 af 18 ff eb c2 e8 e1 af 18 ff eb rcu_sched kthread starved for 124865 jiffies! g34123 c34122 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 rcu_sched R running task 23992 8 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2800 [inline] __schedule+0x8eb/0x2060 kernel/sched/core.c:3376 schedule+0xf5/0x430 kernel/sched/core.c:3435 schedule_timeout+0x118/0x220 kernel/time/timer.c:1805 rcu_gp_kthread+0x9dd/0x18e0 kernel/rcu/tree.c:2230 kthread+0x37a/0x440 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:517 1-...!: (124999 ticks this GP) idle=292/1/4611686018427387906 softirq=59407/59407 fqs=29 (t=125916 jiffies g=34123 c=34122 q=203) rcu_sched kthread starved for 125784 jiffies! g34123 c34122 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 rcu_sched R running task 23992 8 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2800 [inline] __schedule+0x8eb/0x2060 kernel/sched/core.c:3376 schedule+0xf5/0x430 kernel/sched/core.c:3435 schedule_timeout+0x118/0x220 kernel/time/timer.c:1805 rcu_gp_kthread+0x9dd/0x18e0 kernel/rcu/tree.c:2230 kthread+0x37a/0x440 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:517 NMI backtrace for cpu 1 CPU: 1 PID: 16267 Comm: syz-executor7 Not tainted 4.15.0-rc1-next-20171130+ #56 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+0x194/0x257 lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x122/0x180 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:156 [inline] rcu_dump_cpu_stacks+0x186/0x1da kernel/rcu/tree.c:1375 print_cpu_stall kernel/rcu/tree.c:1524 [inline] check_cpu_stall.isra.64+0xbb8/0x15b0 kernel/rcu/tree.c:1592 __rcu_pending kernel/rcu/tree.c:3361 [inline] rcu_pending kernel/rcu/tree.c:3423 [inline] rcu_check_callbacks+0x238/0xd20 kernel/rcu/tree.c:2763 update_process_times+0x30/0x60 kernel/time/timer.c:1640 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162 tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1166 __run_hrtimer kernel/time/hrtimer.c:1348 [inline] __hrtimer_run_queues+0x373/0xea0 kernel/time/hrtimer.c:1411 hrtimer_interrupt+0x2a5/0x6f0 kernel/time/hrtimer.c:1469 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:907 RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:94 RSP: 0018:ffff8801d8df7b38 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff11 RAX: 0000000000000ed7 RBX: ffffc9000134e060 RCX: ffffffff8286e9bc RDX: 0000000000010000 RSI: ffffc90001959000 RDI: ffffc9000134f260 RBP: ffff8801d8df7b88 R08: 0000000000000001 R09: 0000000000000004 R10: 0000000000000000 R11: ffffffff8748cd60 R12: ffffc9000134d000 R13: 000000027f725ed7 R14: 0000000020f76fff R15: ffff8801d7f16df8 tty_ioctl+0x32e/0x15f0 drivers/tty/tty_io.c:2638 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x4529d9 RSP: 002b:00007f3d323e7c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9 RDX: 0000000020f76fff RSI: 000000000000541b RDI: 0000000000000015 RBP: 00000000000005ac R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f58c0 R13: 00000000ffffffff R14: 00007f3d323e86d4 R15: 0000000000000000