loop6: p1 size 135963288 extends beyond EOD, truncated
loop6: p2 start 1279850000 is beyond EOD, truncated
INFO: task syz-executor0:28935 blocked for more than 120 seconds.
      Not tainted 4.9.105-gd7e64f8 #40
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D29816 28935  24897 0x00000004
 ffff8801cd4b9800 ffff8801cc870540 ffff8801ca1d4540 ffff8801cc914800
 ffff8801db221c18 ffff880183ee7ce8 ffffffff839e8c1d ffff8801cd4ba0c8
 ffffed0039a97418 ffff8801cd4b9800 00fffc0000000000 ffff8801db2224e8
Call Trace:
 [<ffffffff839ea21f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839eaba3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3590
 [<ffffffff839ef026>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff839ef026>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff815d83fc>] __fdget_pos+0xac/0xd0 fs/file.c:781
 [<ffffffff81576aee>] fdget_pos include/linux/file.h:66 [inline]
 [<ffffffff81576aee>] SYSC_write fs/read_write.c:599 [inline]
 [<ffffffff81576aee>] SyS_write+0x7e/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81366b9c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81366b9c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81426180>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3772:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7cc2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82120062>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
2 locks held by kworker/u4:7/5303:
 #0:  ("writeback"){++++.+}, at: [<ffffffff8118d02e>] work_static include/linux/workqueue.h:186 [inline]
 #0:  ("writeback"){++++.+}, at: [<ffffffff8118d02e>] set_work_data kernel/workqueue.c:617 [inline]
 #0:  ("writeback"){++++.+}, at: [<ffffffff8118d02e>] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0:  ("writeback"){++++.+}, at: [<ffffffff8118d02e>] process_one_work+0x6ee/0x1500 kernel/workqueue.c:2085
 #1:  ((&(&wb->dwork)->work)){+.+.+.}, at: [<ffffffff8118d068>] process_one_work+0x728/0x1500 kernel/workqueue.c:2089
1 lock held by syz-executor0/28935:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d83fc>] __fdget_pos+0xac/0xd0 fs/file.c:781

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.105-gd7e64f8 #40
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d85d7d08 ffffffff81eb41a9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b96a0 ffff8801d85d7d40
 ffffffff81ebf4a7 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb41a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb41a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf4a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf43a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b97a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81367134>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81367134>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81367134>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81367134>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f9cdc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 28882 Comm: syz-executor0 Not tainted 4.9.105-gd7e64f8 #40
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cf3e3000 task.stack: ffff8801cd638000
RIP: 0010:[<ffffffff810d116b>] 
c [<ffffffff810d116b>] pvclock_clocksource_read+0xb/0x4b0 arch/x86/kernel/pvclock.c:75
RSP: 0018:ffff8801db307e90  EFLAGS: 00000082
RAX: dffffc0000000000 RBX: 00000071d8964d5a RCX: 0000000000000000
RDX: 0000000000010000 RSI: ffffffff81f1bc0b RDI: ffff88021fffd040
RBP: ffff8801db307ea0 R08: ffff8801cf3e39b0 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff10039e7c731 R12: dffffc0000000000
R13: 00000000000167e8 R14: ffffffff85b309c0 R15: ffff8801db31c970
FS:  00007f1215a87700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c448aa1010 CR3: 00000001cf2ff000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801db307ea0
c ffffffff810cecf3
c ffff8801db307eb0
c ffffffff810ced19
c
 ffff8801db307f20
c ffffffff812b9b56
c ffffffff812a603d
c 0300000000000000
c
 ffffed003b66392e
c ffff8801db31caa8
c ffff8801db31ca68
c ffff8801db31ca28
c
Call Trace:
 [<ffffffff810ced19>] kvm_clock_get_cycles+0x9/0x10 arch/x86/kernel/kvmclock.c:98
 [<ffffffff812b9b56>] tk_clock_read kernel/time/timekeeping.c:140 [inline]
 [<ffffffff812b9b56>] timekeeping_get_delta kernel/time/timekeeping.c:234 [inline]
 [<ffffffff812b9b56>] timekeeping_get_ns kernel/time/timekeeping.c:341 [inline]
 [<ffffffff812b9b56>] ktime_get_update_offsets_now+0xa6/0x2f0 kernel/time/timekeeping.c:2285
 [<ffffffff812a603d>] hrtimer_update_base kernel/time/hrtimer.c:502 [inline]
 [<ffffffff812a603d>] hrtimer_interrupt+0x12d/0x430 kernel/time/hrtimer.c:1341
 [<ffffffff810b1e54>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:935
 [<ffffffff839ff2dc>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:959
 [<ffffffff839fb470>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> 
d [<ffffffff81230f8f>] ? arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
 <EOI> 
d [<ffffffff81230f8f>] ? lock_is_held+0xff/0x140 kernel/locking/lockdep.c:3796
 [<ffffffff8127c654>] rcu_read_lock_held+0xa4/0xc0 kernel/rcu/update.c:297
 [<ffffffff814392bb>] radix_tree_deref_slot include/linux/radix-tree.h:199 [inline]
 [<ffffffff814392bb>] find_get_entry+0x34b/0x540 mm/filemap.c:1097
 [<ffffffff8143a3eb>] pagecache_get_page+0x4b/0x720 mm/filemap.c:1203
 [<ffffffff81625669>] find_or_create_page include/linux/pagemap.h:309 [inline]
 [<ffffffff81625669>] grow_dev_page fs/buffer.c:1005 [inline]
 [<ffffffff81625669>] grow_buffers fs/buffer.c:1078 [inline]
 [<ffffffff81625669>] __getblk_slow fs/buffer.c:1105 [inline]
 [<ffffffff81625669>] __getblk_gfp+0x249/0x710 fs/buffer.c:1386
 [<ffffffff81628f4d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818cbe9b>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818cbe9b>] __fat_write_inode+0x2ab/0x980 fs/fat/inode.c:844
 [<ffffffff818d00a9>] fat_write_inode+0x79/0x170 fs/fat/inode.c:893
 [<ffffffff8160259d>] write_inode fs/fs-writeback.c:1180 [inline]
 [<ffffffff8160259d>] __writeback_single_inode+0x86d/0x1020 fs/fs-writeback.c:1379
 [<ffffffff816053ef>] writeback_single_inode+0x24f/0x440 fs/fs-writeback.c:1433
 [<ffffffff816056bc>] sync_inode fs/fs-writeback.c:2458 [inline]
 [<ffffffff816056bc>] sync_inode_metadata+0xac/0xe0 fs/fs-writeback.c:2478
 [<ffffffff815f5151>] __generic_file_fsync+0x141/0x1a0 fs/libfs.c:985
 [<ffffffff815f5227>] generic_file_fsync+0x77/0x110 fs/libfs.c:1011
 [<ffffffff818c7b27>] fat_file_fsync+0x77/0x170 fs/fat/file.c:165
 [<ffffffff8161aa5c>] vfs_fsync_range+0x10c/0x260 fs/sync.c:195
 [<ffffffff8143e212>] generic_write_sync include/linux/fs.h:2607 [inline]
 [<ffffffff8143e212>] generic_file_write_iter+0x442/0x610 mm/filemap.c:2897
 [<ffffffff8156ef20>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff8156ef20>] __vfs_write+0x3e0/0x580 fs/read_write.c:509
 [<ffffffff81572d17>] vfs_write+0x187/0x530 fs/read_write.c:557
 [<ffffffff81576b49>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff81576b49>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c