device gre0 entered promiscuous mode INFO: task syz-executor0:17031 blocked for more than 120 seconds. Not tainted 4.15.0-rc3-next-20171214+ #67 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D 0 17031 3385 0x00000004 Call Trace: context_switch kernel/sched/core.c:2800 [inline] __schedule+0x30b/0xaf0 kernel/sched/core.c:3376 schedule+0x2e/0x90 kernel/sched/core.c:3435 io_schedule+0x11/0x40 kernel/sched/core.c:5043 wait_on_page_bit_common mm/filemap.c:1099 [inline] wait_on_page_bit mm/filemap.c:1132 [inline] wait_on_page_locked include/linux/pagemap.h:530 [inline] __lock_page_or_retry+0x391/0x3e0 mm/filemap.c:1310 lock_page_or_retry include/linux/pagemap.h:510 [inline] filemap_fault+0x61c/0xa70 mm/filemap.c:2532 __do_fault+0x23/0xa4 mm/memory.c:3206 do_read_fault mm/memory.c:3616 [inline] do_fault mm/memory.c:3716 [inline] handle_pte_fault mm/memory.c:3947 [inline] __handle_mm_fault+0x10b5/0x1930 mm/memory.c:4071 handle_mm_fault+0x215/0x450 mm/memory.c:4108 faultin_page mm/gup.c:502 [inline] __get_user_pages+0x1ff/0x980 mm/gup.c:699 populate_vma_page_range+0xa1/0xb0 mm/gup.c:1200 __mm_populate+0xcc/0x190 mm/gup.c:1250 mm_populate include/linux/mm.h:2233 [inline] vm_mmap_pgoff+0x103/0x110 mm/util.c:338 SYSC_mmap_pgoff mm/mmap.c:1533 [inline] SyS_mmap_pgoff+0x215/0x2c0 mm/mmap.c:1491 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452a39 RSP: 002b:00007f0657cbbc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39 RDX: 0000000000000003 RSI: 0000000000001000 RDI: 0000000020e5b000 RBP: 0000000000000249 R08: 0000000000000014 R09: 0000000000000000 R10: 0000000000002011 R11: 0000000000000212 R12: 00000000006f1778 R13: 00000000ffffffff R14: 00007f0657cbc6d4 R15: 0000000000000000 Showing all locks held in the system: 2 locks held by khungtaskd/673: #0: (rcu_read_lock){....}, at: [<0000000079b8ed22>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<0000000079b8ed22>] watchdog+0xbf/0x750 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<00000000ce7c65d5>] debug_show_all_locks+0x3d/0x1a0 kernel/locking/lockdep.c:4464 1 lock held by rsyslogd/2981: #0: (&f->f_pos_lock){+.+.}, at: [<00000000d4914f35>] __fdget_pos+0x5b/0x70 fs/file.c:765 2 locks held by getty/3103: #0: (&tty->ldisc_sem){++++}, at: [<000000003e6f6825>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000520fadc6>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 2 locks held by getty/3104: #0: (&tty->ldisc_sem){++++}, at: [<000000003e6f6825>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000520fadc6>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 2 locks held by getty/3105: #0: (&tty->ldisc_sem){++++}, at: [<000000003e6f6825>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000520fadc6>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 2 locks held by getty/3106: #0: (&tty->ldisc_sem){++++}, at: [<000000003e6f6825>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000520fadc6>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 2 locks held by getty/3107: #0: (&tty->ldisc_sem){++++}, at: [<000000003e6f6825>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000520fadc6>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 2 locks held by getty/3108: #0: (&tty->ldisc_sem){++++}, at: [<000000003e6f6825>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000520fadc6>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 2 locks held by getty/17098: #0: (&tty->ldisc_sem){++++}, at: [<000000003e6f6825>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000520fadc6>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 673 Comm: khungtaskd Not tainted 4.15.0-rc3-next-20171214+ #67 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+0xe9/0x14b lib/dump_stack.c:53 nmi_cpu_backtrace+0x149/0x150 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x101/0x150 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x562/0x750 kernel/hung_task.c:249 kthread+0x149/0x170 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54