mmap: syz-executor2 (6065) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt.
INFO: task syz-executor0:2094 blocked for more than 140 seconds.
      Not tainted 4.9.125+ #89
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D26920  2094      1 0x00000004
 ffff8801d1f217c0 ffff8801a82bb180 ffff8801cc63a100 ffff8801d74817c0
 ffff8801db621018 ffff8801b3a0fb28 ffffffff8277d092 0000000000000001
 ffff8801d1f22070 ffffed003a3e440d 00ff8801d1f217c0 ffff8801db6218f0
Call Trace:
 [<ffffffff8277e5bf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff8277ef43>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff82780bc6>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82780bc6>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff81d8cadf>] lo_release+0x1f/0x1a0 drivers/block/loop.c:1606
 [<ffffffff815a3f76>] __blkdev_put+0x636/0x840 fs/block_dev.c:1598
 [<ffffffff815a4f65>] blkdev_put+0x85/0x560 fs/block_dev.c:1663
 [<ffffffff815a54cb>] blkdev_close+0x8b/0xb0 fs/block_dev.c:1670
 [<ffffffff814f06f3>] __fput+0x263/0x700 fs/file_table.c:208
 [<ffffffff814f0c15>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff81138c4c>] task_work_run+0x10c/0x180 kernel/task_work.c:116
 [<ffffffff81003e49>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff81003e49>] exit_to_usermode_loop+0x129/0x150 arch/x86/entry/common.c:161
 [<ffffffff8100570d>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff8100570d>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff8100570d>] do_syscall_64+0x35d/0x480 arch/x86/entry/common.c:287
 [<ffffffff8278c193>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309abc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309abc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813e68fc>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/1898:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8154c11c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2025:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278a262>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cdd442>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor0/2094:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a39fb>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1579
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81d8cadf>] lo_release+0x1f/0x1a0 drivers/block/loop.c:1606
2 locks held by syz-executor3/2097:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a428c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81d829eb>] lo_open+0x1b/0xa0 drivers/block/loop.c:1564
1 lock held by syz-executor4/2099:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a428c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
2 locks held by syz-executor6/2103:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a428c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81d829eb>] lo_open+0x1b/0xa0 drivers/block/loop.c:1564
2 locks held by syz-executor5/2107:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a428c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81d829eb>] lo_open+0x1b/0xa0 drivers/block/loop.c:1564
2 locks held by syz-executor1/6037:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff81d88a8c>] lo_ioctl+0x8c/0x1670 drivers/block/loop.c:1353
 #1:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff81aba3be>] blkdev_reread_part+0x1e/0x40 block/ioctl.c:189
1 lock held by syz-executor7/6024:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81d8a61a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1915
2 locks held by syz-executor7/6040:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81d8a61a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1915
 #1:  (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<ffffffff81d8a726>] loop_control_ioctl+0x186/0x300 drivers/block/loop.c:1929
1 lock held by blkid/6023:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a4f0a>] blkdev_put+0x2a/0x560 fs/block_dev.c:1621
2 locks held by blkid/6038:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a39fb>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1579
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81d8cadf>] lo_release+0x1f/0x1a0 drivers/block/loop.c:1606
1 lock held by syz-executor2/6065:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a428c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
1 lock held by syz-executor2/6066:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815a428c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.125+ #89
 ffff8801d9907d08 ffffffff81af0ae9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810967d0 ffff8801d9907d40
 ffffffff81afb849 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81af0ae9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af0ae9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81afb849>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81afb7dc>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810968d4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8130a04d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8130a04d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8130a04d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8130a04d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8113d9ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278c35c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6074 Comm: kworker/0:4 Not tainted 4.9.125+ #89
Workqueue: events_power_efficient gc_worker
c
task: ffff8801c587c740 task.stack: ffff8801d5dd0000
RIP: 0010:[<ffffffff811ff2d7>] 
c [<ffffffff811ff2d7>] __lock_acquire+0x347/0x4a10 kernel/locking/lockdep.c:3289
RSP: 0018:ffff8801d5dd79a0  EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff8801c587d040 RCX: 0000000000000002
RDX: 1ffff10038b0fa0b RSI: 000000000000001e RDI: ffff8801c587d050
RBP: ffff8801d5dd7b48 R08: 0000000000000000 R09: 0000000000000000
R10: ffff8801c587c740 R11: 1ffff10038b0fa07 R12: 000000000000001e
R13: 0000000000000002 R14: ffffffff82ecc3a0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c422700010 CR3: 00000001d41c6000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801c587cfe8
c ffff8801c587cff0
c 1ffff1003abbaf38
c ffffffff83a52258
c
 0000000041b58ab3
c ffffffff82c30a48
c ffffffff811fef90
c ffff8801c587d030
c
 ffff880100000000
c ffff8801c587d018
c ffffffff83aa80e0
c 0000000000000001
c
Call Trace:
 [<ffffffff812044b0>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff8237402c>] rcu_lock_acquire include/linux/rcupdate.h:493 [inline]
 [<ffffffff8237402c>] rcu_read_lock include/linux/rcupdate.h:875 [inline]
 [<ffffffff8237402c>] gc_worker+0xcc/0x610 net/netfilter/nf_conntrack_core.c:966
 [<ffffffff8112c511>] process_one_work+0x791/0x1470 kernel/workqueue.c:2092
 [<ffffffff8112d2c6>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff8113d9ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278c35c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Code: 
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c