audit: type=1404 audit(1533045732.653:3): enforcing=6950 old_enforcing=6937 auid=4294967295 ses=4294967295
INFO: task syz-executor0:6970 blocked for more than 140 seconds.
      Not tainted 4.9.113-g90e7a90 #16
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D29640  6970   3852 0x00000004
 ffff8801d41b4800 ffff8801bb7f6f40 ffff8801cf051a40 ffff8801d9bd4800
 ffff8801db321c18 ffff88019821fac8 ffffffff839ea29d ffffffff81235647
 0000000000000000 ffff8801d41b50c0 0000000600000007 ffff8801db3224e8
Call Trace:
 [<ffffffff839eb89f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839f6ed8>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f6ed8>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee8847>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff8122c270>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff8122c270>] down_write_nested+0x60/0xa0 kernel/locking/rwsem.c:174
 [<ffffffff815aa09a>] inode_lock_nested include/linux/fs.h:801 [inline]
 [<ffffffff815aa09a>] filename_create+0x17a/0x490 fs/namei.c:3639
 [<ffffffff815ac51b>] user_path_create fs/namei.c:3697 [inline]
 [<ffffffff815ac51b>] SYSC_mkdirat fs/namei.c:3841 [inline]
 [<ffffffff815ac51b>] SyS_mkdirat+0xbb/0x260 fs/namei.c:3833
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fb193>] 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: [<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 getty/3775:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f9342>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff821200e2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor0/6970:
 #0:  (sb_writers#10){.+.+.+}, at: [<ffffffff815e0b0f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#10){.+.+.+}, at: [<ffffffff815e0b0f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#14/1){+.+.+.}, at: [<ffffffff815aa09a>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#14/1){+.+.+.}, at: [<ffffffff815aa09a>] filename_create+0x17a/0x490 fs/namei.c:3639
2 locks held by syz-executor0/6971:
 #0:  (sb_writers#10){.+.+.+}, at: [<ffffffff815e0b0f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#10){.+.+.+}, at: [<ffffffff815e0b0f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#14/1){+.+.+.}, at: [<ffffffff815aa09a>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#14/1){+.+.+.}, at: [<ffffffff815aa09a>] filename_create+0x17a/0x490 fs/namei.c:3639
2 locks held by syz-executor0/6974:
 #0:  (sb_writers#10){.+.+.+}, at: [<ffffffff815e0b0f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#10){.+.+.+}, at: [<ffffffff815e0b0f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&type->s_vfs_rename_key#2){+.+.+.}, at: [<ffffffff81593f99>] lock_rename+0x59/0x290 fs/namei.c:2861

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.113-g90e7a90 #16
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d853fd08 ffffffff81eb4569 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9bd0 ffff8801d853fd40
 ffffffff81ebf867 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb4569>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb4569>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf867>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf7fa>] 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
 [<ffffffff839fb35c>] 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: 6822 Comm: syz-executor0 Not tainted 4.9.113-g90e7a90 #16
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d4cac800 task.stack: ffff880198f90000
RIP: 0010:[<ffffffff812343aa>] 
c [<ffffffff812343aa>] mark_lock+0xaa/0x1280 kernel/locking/lockdep.c:3039
RSP: 0018:ffff880198f97610  EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff8801d4cad0c8 RCX: 1ffff1003a995a1d
RDX: 1ffffffff0abeb4a RSI: ffff8801d4cad0c8 RDI: ffffffff855f5a50
RBP: ffff880198f97658 R08: ffff8801d4cad0e8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff855f5a20
R13: 0000000000000008 R14: 0000000000000003 R15: ffff8801d4cac800
FS:  00007fa099ee3700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb671882000 CR3: 00000001d7141000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d4cac800
c ffffffff846def20
c 00000000000001cc
c ffff8801cbfe9a88
c
 0000000000000000
c ffff8801d4cad0c8
c ffffed003a995a18
c ffff8801d4cac800
c
 dffffc0000000000
c ffff880198f976a8
c ffffffff81235647
c ffff8801d4cac800
c
Call Trace:
 [<ffffffff81235647>] mark_held_locks+0xc7/0x130 kernel/locking/lockdep.c:2660
 [<ffffffff81235916>] __trace_hardirqs_on_caller kernel/locking/lockdep.c:2681 [inline]
 [<ffffffff81235916>] trace_hardirqs_on_caller+0x266/0x590 kernel/locking/lockdep.c:2736
 [<ffffffff81235c4d>] trace_hardirqs_on+0xd/0x10 kernel/locking/lockdep.c:2743
 [<ffffffff81624553>] lookup_bh_lru fs/buffer.c:1344 [inline]
 [<ffffffff81624553>] __find_get_block+0x183/0x4c0 fs/buffer.c:1356
 [<ffffffff81625419>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff81625419>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff81628dbd>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818cc33b>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818cc33b>] __fat_write_inode+0x2ab/0x980 fs/fat/inode.c:844
 [<ffffffff818cca2a>] fat_sync_inode+0x1a/0x20 fs/fat/inode.c:900
 [<ffffffff818dd7e5>] vfat_rename+0x4c5/0xcd0 fs/fat/namei_vfat.c:970
 [<ffffffff81596d8a>] vfs_rename2+0x5fa/0x18f0 fs/namei.c:4501
 [<ffffffff815aeb06>] SYSC_renameat2 fs/namei.c:4657 [inline]
 [<ffffffff815aeb06>] SyS_renameat2 fs/namei.c:4546 [inline]
 [<ffffffff815aeb06>] SYSC_renameat fs/namei.c:4692 [inline]
 [<ffffffff815aeb06>] SyS_renameat+0x606/0x7f0 fs/namei.c:4689
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fb193>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c