INFO: task syz-executor7:12406 blocked for more than 120 seconds.
      Not tainted 4.15.0-rc6-next-20180105+ #89
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D26384 12406   3696 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2800 [inline]
 __schedule+0x850/0x1e10 kernel/sched/core.c:3376
 schedule+0x7c/0x1a0 kernel/sched/core.c:3435
 io_schedule+0x1c/0x70 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+0x725/0x900 mm/filemap.c:1310
 lock_page_or_retry include/linux/pagemap.h:510 [inline]
 filemap_fault+0xadf/0x1900 mm/filemap.c:2532
 __do_fault+0x8a/0x1d0 mm/memory.c:3224
 do_read_fault mm/memory.c:3634 [inline]
 do_fault mm/memory.c:3734 [inline]
 handle_pte_fault mm/memory.c:3965 [inline]
 __handle_mm_fault+0x1c96/0x3210 mm/memory.c:4089
 handle_mm_fault+0x305/0x840 mm/memory.c:4126
 faultin_page mm/gup.c:502 [inline]
 __get_user_pages+0x37e/0x1140 mm/gup.c:699
 populate_vma_page_range+0x18e/0x230 mm/gup.c:1200
 __mm_populate+0x204/0x350 mm/gup.c:1250
 mm_populate include/linux/mm.h:2233 [inline]
 vm_mmap_pgoff+0x1e1/0x1f0 mm/util.c:338
 SYSC_mmap_pgoff mm/mmap.c:1544 [inline]
 SyS_mmap_pgoff+0x423/0x580 mm/mmap.c:1502
 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+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f101a2cbc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000000000003 RSI: 0000000000001000 RDI: 0000000020e5b000
RBP: 00000000000003a3 R08: 0000000000000016 R09: 0000000000000000
R10: 0000000000002011 R11: 0000000000000212 R12: 00000000006f37e8
R13: 00000000ffffffff R14: 00007f101a2cc6d4 R15: 0000000000000000

Showing all locks held in the system:
2 locks held by khungtaskd/740:
 #0:  (rcu_read_lock){....}, at: [<000000004b45b7b1>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
 #0:  (rcu_read_lock){....}, at: [<000000004b45b7b1>] watchdog+0x122/0xab0 kernel/hung_task.c:249
 #1:  (tasklist_lock){.+.+}, at: [<00000000b3ab77a5>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4464
1 lock held by rsyslogd/3316:
 #0:  (&f->f_pos_lock){+.+.}, at: [<000000005a706309>] __fdget_pos+0xa2/0xc0 fs/file.c:765
2 locks held by getty/3437:
 #0:  (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131
2 locks held by getty/3438:
 #0:  (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131
2 locks held by getty/3439:
 #0:  (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131
2 locks held by getty/3440:
 #0:  (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131
2 locks held by getty/3441:
 #0:  (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131
2 locks held by getty/3442:
 #0:  (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131
2 locks held by getty/3443:
 #0:  (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 740 Comm: khungtaskd Not tainted 4.15.0-rc6-next-20180105+ #89
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+0x137/0x198 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_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+0x73d/0xab0 kernel/hung_task.c:249
 kthread+0x33c/0x400 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-rc6-next-20180105+ #89
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:reschedule_interrupt+0x0/0xb0 arch/x86/entry/entry_64.S:943
RSP: 0018:ffffffff85e07cd8 EFLAGS: 00000086
RAX: dffffc0000000000 RBX: ffffffff85e2c340 RCX: 0000000000000000
RDX: 1ffffffff0bd90a0 RSI: 0000000000000001 RDI: ffffffff85ec8500
RBP: ffffffff85e07d00 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff86638fe0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8c8b3a2000 CR3: 0000000005e22001 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline]
 default_idle+0x52/0x310 arch/x86/kernel/process.c:354
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:345
 default_idle_call+0x36/0x90 kernel/sched/idle.c:98
 cpuidle_idle_call kernel/sched/idle.c:156 [inline]
 do_idle+0x24a/0x3b0 kernel/sched/idle.c:246
 cpu_startup_entry+0xbe/0xd0 kernel/sched/idle.c:351
 rest_init+0xed/0xf0 init/main.c:436
 start_kernel+0x77e/0x7a4 init/main.c:716
 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378
 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359
 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237
Code: 25 54 ed 01 00 75 12 65 48 89 3c 25 f8 7f 00 00 65 48 8b 24 25 58 ed 01 00 57 e8 8b 21 20 fc e8 97 1f 00 00 e9 cb e8 ff ff 66 90 <0f> 1f 00 68 02 ff ff ff fc f6 44 24 10 03 74 0b 0f 01 f8 0f 1f