INFO: task syz-executor5:24039 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-executor5 D 0 24039 3351 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:00007f64698d0c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39 RDX: 0000000000000003 RSI: 0000000000001000 RDI: 0000000020e5b000 RBP: 00000000000005ab R08: 0000000000000013 R09: 0000000000000000 R10: 0000000000002011 R11: 0000000000000212 R12: 00000000006f68a8 R13: 00000000ffffffff R14: 00007f64698d16d4 R15: 0000000000000000 Showing all locks held in the system: 2 locks held by khungtaskd/673: #0: (rcu_read_lock){....}, at: [<00000000935ba144>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<00000000935ba144>] watchdog+0xbf/0x750 kernel/hung_task.c:249 #1: (tasklist_lock){.?.?}, at: [<0000000070daa804>] debug_show_all_locks+0x3d/0x1a0 kernel/locking/lockdep.c:4464 1 lock held by rsyslogd/2972: #0: (&f->f_pos_lock){+.+.}, at: [<0000000098ebdbe3>] __fdget_pos+0x5b/0x70 fs/file.c:765 2 locks held by getty/3095: #0: (&tty->ldisc_sem){++++}, at: [<000000005f19f301>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000088d7967e>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 2 locks held by getty/3096: #0: (&tty->ldisc_sem){++++}, at: [<000000005f19f301>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000088d7967e>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 2 locks held by getty/3097: #0: (&tty->ldisc_sem){++++}, at: [<000000005f19f301>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000088d7967e>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 2 locks held by getty/3098: #0: (&tty->ldisc_sem){++++}, at: [<000000005f19f301>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000088d7967e>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 2 locks held by getty/3099: #0: (&tty->ldisc_sem){++++}, at: [<000000005f19f301>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000088d7967e>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 2 locks held by getty/3100: #0: (&tty->ldisc_sem){++++}, at: [<000000005f19f301>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000088d7967e>] n_tty_read+0xce/0xa40 drivers/tty/n_tty.c:2131 2 locks held by getty/24114: #0: (&tty->ldisc_sem){++++}, at: [<000000005f19f301>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000088d7967e>] 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 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc3-next-20171214+ #67 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:smp_reschedule_interrupt+0x1c/0x240 arch/x86/kernel/smp.c:263 RSP: 0018:ffff88021fc03fe0 EFLAGS: 00000006 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000080b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000b0 RBP: ffff88021fc03fe8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff8304f960 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbf8a8cec98 CR3: 000000021162a000 CR4: 00000000001406f0 DR0: 0000000020001000 DR1: 0000000020001000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: reschedule_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:944 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 RSP: 0018:ffffffff83003e30 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: ffffffff83025500 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffffffff83025500 RSI: 0000000000000001 RDI: ffffffff83025500 RBP: ffffffff83003e30 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff8304f960 R14: 0000000000000000 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline] default_idle+0x2e/0x1a0 arch/x86/kernel/process.c:354 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:345 default_idle_call+0x1e/0x40 kernel/sched/idle.c:98 cpuidle_idle_call kernel/sched/idle.c:156 [inline] do_idle+0x17e/0x220 kernel/sched/idle.c:246 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351 rest_init+0xc7/0xd0 init/main.c:436 start_kernel+0x52b/0x53a init/main.c:717 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378 x86_64_start_kernel+0x72/0x75 arch/x86/kernel/head64.c:359 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 Code: ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 05 09 2f 96 00 55 31 f6 bf b0 00 00 00 48 89 e5 53 ff 10 65 ff 05 40 c1 a1 7d <0f> 1f 44 00 00 e8 4a ea bf fe 5b 5d c3 e8 d2 93 bc fe 0f 1f 44