INFO: task syz-executor5:15246 blocked for more than 140 seconds.
      Not tainted 4.9.113-g47bbcd6 #10
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D28504 15246   3879 0x00000004
 ffff8801aae60000 0000000000000000 ffff8801d95bf480 ffff88019ea8b000
 ffff8801db221c18 ffff88019cdc7a78 ffffffff839e909d ffffffff81235647
 0000000000000000 ffff8801aae608c0 0000000600000007 ffff8801db2224e8
Call Trace:
 [<ffffffff839ea69f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839f5cd8>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f5cd8>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee7587>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff839f3aac>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff839f3aac>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff81568e21>] inode_lock include/linux/fs.h:766 [inline]
 [<ffffffff81568e21>] chmod_common+0x171/0x450 fs/open.c:543
 [<ffffffff8156ccfd>] SYSC_fchmodat fs/open.c:582 [inline]
 [<ffffffff8156ccfd>] SyS_fchmodat fs/open.c:574 [inline]
 [<ffffffff8156ccfd>] SYSC_chmod fs/open.c:594 [inline]
 [<ffffffff8156ccfd>] SyS_chmod+0xad/0x130 fs/open.c:592
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9f93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/518:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136675c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136675c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425de7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by rs:main Q:Reg/3678:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d81ec>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff81572cce>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff81572cce>] vfs_write+0x3ae/0x530 fs/read_write.c:556
1 lock held by rsyslogd/3680:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d81ec>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3776:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f8142>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211ee22>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor5/15203:
 #0:  (sb_writers#18){.+.+.+}, at: [<ffffffff815e0a8f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#18){.+.+.+}, at: [<ffffffff815e0a8f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#22){++++++}, at: [<ffffffff81568e21>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#22){++++++}, at: [<ffffffff81568e21>] chmod_common+0x171/0x450 fs/open.c:543
1 lock held by syz-executor5/15245:
 #0:  (&type->s_umount_key#43/1){+.+.+.}, at: [<ffffffff8157b9f2>] alloc_super fs/super.c:241 [inline]
 #0:  (&type->s_umount_key#43/1){+.+.+.}, at: [<ffffffff8157b9f2>] sget_userns+0x552/0xba0 fs/super.c:503
2 locks held by syz-executor5/15246:
 #0:  (sb_writers#18){.+.+.+}, at: [<ffffffff815e0a8f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#18){.+.+.+}, at: [<ffffffff815e0a8f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#22){++++++}, at: [<ffffffff81568e21>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#22){++++++}, at: [<ffffffff81568e21>] chmod_common+0x171/0x450 fs/open.c:543

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

NMI backtrace for cpu 1
CPU: 1 PID: 518 Comm: khungtaskd Not tainted 4.9.113-g47bbcd6 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d898fd08 ffffffff81eb32a9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9bd0 ffff8801d898fd40
 ffffffff81ebe5a7 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb32a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb32a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebe5a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebe53a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9cd4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366cf4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366cf4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366cf4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366cf4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fa15c>] 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: 0 Comm: swapper/0 Not tainted 4.9.113-g47bbcd6 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84629800 task.stack: ffffffff84600000
RIP: 0010:[<ffffffff81eb2d00>] 
c [<ffffffff81eb2d00>] cpumask_next_and+0x30/0xb0 lib/cpumask.c:19
RSP: 0018:ffff8801db207be0  EFLAGS: 00000202
RAX: 1ffff1003b3227d6 RBX: 00000000ffffffff RCX: 00000000ffffffff
RDX: ffff8801db2185d8 RSI: ffff8801d9913ec0 RDI: 00000000ffffffff
RBP: ffff8801db207c10 R08: ffff8801db207e48 R09: dffffc0000000000
R10: fffffbfff08c1200 R11: 0000000000000001 R12: 0000000000000007
R13: 1ffffffff098bfa8 R14: ffff8801db207d88 R15: ffff8801db2185d8
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd50b29e000 CR3: 00000001cbbf9000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801d9913ec0
c 0000000000000007
c ffff8801d9913ea0
c dffffc0000000000
c
 ffff8801db207d88
c ffff8801d9913f00
c ffff8801db207db0
c ffffffff8120307a
c
 1ffff1003b640f86
c 0000000000000000
c 0000000041b58ab3
c ffffffff843c3fd0
c
Call Trace:
 <IRQ> 
d [<ffffffff8120307a>] should_we_balance kernel/sched/fair.c:9412 [inline]
 <IRQ> 
d [<ffffffff8120307a>] load_balance+0x33a/0x2fa0 kernel/sched/fair.c:9469
 [<ffffffff812081ce>] rebalance_domains+0x6be/0xbc0 kernel/sched/fair.c:10115
 [<ffffffff812089c9>] run_rebalance_domains+0x2f9/0x510 kernel/sched/fair.c:10333
 [<ffffffff83a00b7b>] __do_softirq+0x20b/0x937 kernel/softirq.c:284
 [<ffffffff8114b287>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff8114b287>] irq_exit+0x147/0x190 kernel/softirq.c:405
 [<ffffffff839fe721>] smp_reschedule_interrupt+0x71/0x90 arch/x86/kernel/smp.c:270
 [<ffffffff839fc290>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff839f8ba6>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff839f81e5>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff839f81e5>] default_idle+0x55/0x360 arch/x86/kernel/process.c:437
 [<ffffffff8106ae00>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:428
 [<ffffffff839f9005>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff812231d5>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff812231d5>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff812231d5>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff839e5e6c>] rest_init+0x183/0x189 init/main.c:409
 [<ffffffff84c97943>] start_kernel+0x67e/0x6b2 init/main.c:664
 [<ffffffff84c9629a>] x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:196
 [<ffffffff84c963db>] x86_64_start_kernel+0x13f/0x162 arch/x86/kernel/head64.c:177
Code: 
c57 
c49 
c89 
cd7 
c41 
c56 
c41 
c55 
c41 
c54 
c49 
cc7 
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c84 
c53 
c4d 
c89 
ce5 
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c41 
c83 
ce4 
c07 
c48 
c83 
cec 
c08 
c49 
cc1 
ced 
c03 
c48 
c89 
c75 
cd0 
c41 
c83 
cc4 
c03 
c<e8> 
c6b 
cbd 
c4a 
cff 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c49 
c01 
cc5 
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ce8 
c