INFO: task syz-executor2:11648 blocked for more than 120 seconds. Not tainted 4.13.0-rc4-next-20170811 #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D22032 11648 3004 0x00000004 Call Trace: context_switch kernel/sched/core.c:2786 [inline] __schedule+0x8e8/0x2070 kernel/sched/core.c:3362 schedule+0x108/0x440 kernel/sched/core.c:3422 io_schedule+0x1c/0x70 kernel/sched/core.c:5030 wait_on_page_bit_common+0x4c7/0x7f0 mm/filemap.c:973 wait_on_page_bit mm/filemap.c:1005 [inline] wait_on_page_locked include/linux/pagemap.h:525 [inline] __lock_page_or_retry+0x3f7/0x4f0 mm/filemap.c:1182 lock_page_or_retry include/linux/pagemap.h:505 [inline] filemap_fault+0xe03/0x1a70 mm/filemap.c:2379 __do_fault+0xe1/0x3c0 mm/memory.c:3064 do_read_fault mm/memory.c:3466 [inline] do_fault mm/memory.c:3566 [inline] handle_pte_fault mm/memory.c:3796 [inline] __handle_mm_fault+0x1ba7/0x38f0 mm/memory.c:3921 handle_mm_fault+0x144/0x490 mm/memory.c:3958 faultin_page mm/gup.c:495 [inline] __get_user_pages+0x4f8/0x15f0 mm/gup.c:692 populate_vma_page_range+0x20e/0x2f0 mm/gup.c:1145 __mm_populate+0x23a/0x450 mm/gup.c:1195 mm_populate include/linux/mm.h:2117 [inline] vm_mmap_pgoff+0x241/0x280 mm/util.c:338 SYSC_mmap_pgoff mm/mmap.c:1518 [inline] SyS_mmap_pgoff+0x462/0x5f0 mm/mmap.c:1476 SYSC_mmap arch/x86/kernel/sys_x86_64.c:99 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:90 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x4512e9 RSP: 002b:00007f0b0cceec08 EFLAGS: 00000216 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00000000007180a8 RCX: 00000000004512e9 RDX: 0000000000000003 RSI: 0000000000001000 RDI: 0000000020e5b000 RBP: 0000000000000086 R08: 0000000000000017 R09: 0000000000000000 R10: 0000000000002011 R11: 0000000000000216 R12: 00000000004b70fd R13: 00000000ffffffff R14: 0000000020b52000 R15: 0000000000001000 Showing all locks held in the system: 2 locks held by khungtaskd/553: #0: (rcu_read_lock){....}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0xd2/0x410 kernel/locking/lockdep.c:4552 2 locks held by getty/2903: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2904: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2905: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2906: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2907: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2908: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2909: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 553 Comm: khungtaskd Not tainted 4.13.0-rc4-next-20170811 #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 nmi_cpu_backtrace+0x20e/0x240 lib/nmi_backtrace.c:102 nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:61 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 trigger_all_cpu_backtrace include/linux/nmi.h:105 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x90c/0xd60 kernel/hung_task.c:249 kthread+0x35e/0x430 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8449bf46