INFO: task syz-executor958:4365 blocked for more than 120 seconds.
      Not tainted 4.9.109-ga4230be #48
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor958 D28456  4365   4246 0x00000000
 ffff8801ce26c800 ffff8801cec0f480 ffff8801cec0f480 ffff8801d32e3000
 ffff8801db321c18 ffff8801cbb1fa38 ffffffff839e8a8d ffffffff812355f7
 0000000000000000 ffff8801ce26d0c0 0000000600000007 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea08f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f56c8>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f56c8>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee8107>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff839f349c>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff839f349c>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
 [<ffffffff815e44c7>] do_add_mount+0x27/0x340 fs/namespace.c:2460
 [<ffffffff815e61b2>] do_new_mount fs/namespace.c:2527 [inline]
 [<ffffffff815e61b2>] do_mount+0x1332/0x2740 fs/namespace.c:2835
 [<ffffffff815e7f9e>] SYSC_mount fs/namespace.c:3051 [inline]
 [<ffffffff815e7f9e>] SyS_mount+0xfe/0x110 fs/namespace.c:3028
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9993>] 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: [<ffffffff8136662c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136662c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425cb7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3775:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7b32>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211fce2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor958/4262:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4270:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4277:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4284:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4292:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4298:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4303:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4316:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4319:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4329:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4330:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4340:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4352:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4353:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4365:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
2 locks held by syz-executor958/4366:
 #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff81593fa6>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff81593fa6>] lock_rename+0x236/0x290 fs/namei.c:2857
2 locks held by syz-executor958/4261:
 #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff815a9eca>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff815a9eca>] filename_create+0x17a/0x490 fs/namei.c:3639
1 lock held by syz-executor958/4265:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4273:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4279:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4287:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4308:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4309:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4320:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4321:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>] lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor958/4335:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4342:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4343:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4356:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4357:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4370:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>] lookup_slow+0x141/0x470 fs/namei.c:1645
2 locks held by syz-executor958/4371:
 #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff815a9eca>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff815a9eca>] filename_create+0x17a/0x490 fs/namei.c:3639
2 locks held by syz-executor958/4260:
 #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff81593fa6>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff81593fa6>] lock_rename+0x236/0x290 fs/namei.c:2857
1 lock held by syz-executor958/4269:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4276:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4283:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4291:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4300:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4306:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4307:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4313:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4327:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4328:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4350:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4351:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4369:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4378:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4382:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4259:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4268:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4274:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4282:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4290:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4296:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4301:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
2 locks held by syz-executor958/4312:
 #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff81593fa6>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff81593fa6>] lock_rename+0x236/0x290 fs/namei.c:2857
1 lock held by syz-executor958/4326:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4336:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4345:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4346:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4360:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4374:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4375:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4381:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4258:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4267:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4275:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4281:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4289:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4297:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4302:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4314:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4315:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4331:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4332:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4344:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4358:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4359:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4372:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4373:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4256:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4263:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4271:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4285:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4293:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4299:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4304:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4317:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4325:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4338:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4339:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4349:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4363:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4364:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4379:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4380:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>] lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor958/4255:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4266:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4280:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4288:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>] lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor958/4295:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4310:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4311:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4323:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4324:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4337:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4347:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4348:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4361:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4362:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4376:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4377:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4257:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4264:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4272:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4278:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4286:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4294:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4305:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4318:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4322:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>] lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor958/4333:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4334:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4341:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4354:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4355:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4367:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4368:
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.109-ga4230be #48
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d891fd08 ffffffff81eb3e29 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9580 ffff8801d891fd40
 ffffffff81ebf127 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb3e29>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb3e29>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf127>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf0ba>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9684>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366bc4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366bc4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366bc4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366bc4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f9b5c>] 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: 4254 Comm: syz-executor958 Not tainted 4.9.109-ga4230be #48
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cfc50000 task.stack: ffff8801be940000
RIP: 0010:[<ffffffff8158d462>] 
c [<ffffffff8158d462>] pipe_write+0x612/0xd60 fs/pipe.c:386
RSP: 0018:ffff8801be947c00  EFLAGS: 00000a06
RAX: dffffc0000000000 RBX: ffff8801cfd70280 RCX: 1ffffffff0798d78
RDX: 0000000000000000 RSI: ffffffff8158d386 RDI: ffff8801d07ddf90
RBP: ffff8801be947c78 R08: ffff8801cfc508e8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000012
R13: 0000000000000001 R14: ffffffff83cc6bc0 R15: ffff8801d07ddf80
FS:  0000000001939880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8798dae110 CR3: 00000001d4e37000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 eff1a6c41b3a044f
c ffff8801be947d80
c 0000000000000012
c ffff8801cfd70354
c
 0000000000000001
c ffff8801be947d70
c ffff8801be947c70
c ffff8801cfd70348
c
 ffffffff81ef267f
c ffff8801cfc2c000
c 1ffff10037d28f96
c ffff8801be947dd0
c
Call Trace:
 [<ffffffff8156eb60>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff8156eb60>] __vfs_write+0x3e0/0x580 fs/read_write.c:509
 [<ffffffff81572957>] vfs_write+0x187/0x530 fs/read_write.c:557
 [<ffffffff81576789>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff81576789>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9993>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c10 
c48 
c89 
cfa 
c48 
cc1 
cea 
c03 
c80 
c3c 
c02 
c00 
c0f 
c85 
cd4 
c06 
c00 
c00 
c48 
cba 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c4d 
c8b 
c77 
c10 
c4c 
c89 
cf1 
c48 
cc1 
ce9 
c03 
c0f 
cb6 
c14 
c11 
c<84> 
cd2 
c74 
c09 
c80 
cfa 
c03 
c0f 
c8e 
ce0 
c06 
c00 
c00 
c41 
c8b 
c36 
c85 
cf6 
c0f 
c84 
c12 
c