INFO: task syz.0.17:5367 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17        state:D stack:29008 pid: 5367 ppid:  5045 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 rwsem_down_write_slowpath+0xc87/0x1260 kernel/locking/rwsem.c:1165
 inode_lock_nested include/linux/fs.h:822 [inline]
 filename_create+0x208/0x470 fs/namei.c:3843
 do_mkdirat+0xa5/0x5b0 fs/namei.c:4088
 __do_sys_mkdirat fs/namei.c:4113 [inline]
 __se_sys_mkdirat fs/namei.c:4111 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4111
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fac45e17379
RSP: 002b:00007fac4545a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fac46073090 RCX: 00007fac45e17379
RDX: 0000000000000000 RSI: 0000200000002040 RDI: ffffffffffffff9c
RBP: 00007fac45eaad68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fac46073128 R14: 00007fac46073090 R15: 00007ffceaf08518
 </TASK>
INFO: task syz.4.21:5419 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.21        state:D stack:29072 pid: 5419 ppid:  5060 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 rwsem_down_write_slowpath+0xc87/0x1260 kernel/locking/rwsem.c:1165
 inode_lock_nested include/linux/fs.h:822 [inline]
 filename_create+0x208/0x470 fs/namei.c:3843
 do_mkdirat+0xa5/0x5b0 fs/namei.c:4088
 __do_sys_mkdirat fs/namei.c:4113 [inline]
 __se_sys_mkdirat fs/namei.c:4111 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4111
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f404db56379
RSP: 002b:00007f404d199028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f404ddb2090 RCX: 00007f404db56379
RDX: 0000000000000000 RSI: 0000200000002040 RDI: ffffffffffffff9c
RBP: 00007f404dbe9d68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f404ddb2128 R14: 00007f404ddb2090 R15: 00007ffe76a388a8
 </TASK>
INFO: task syz.3.20:5436 blocked for more than 146 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.20        state:D stack:29072 pid: 5436 ppid:  5058 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 rwsem_down_write_slowpath+0xc87/0x1260 kernel/locking/rwsem.c:1165
 inode_lock_nested include/linux/fs.h:822 [inline]
 filename_create+0x208/0x470 fs/namei.c:3843
 do_mkdirat+0xa5/0x5b0 fs/namei.c:4088
 __do_sys_mkdirat fs/namei.c:4113 [inline]
 __se_sys_mkdirat fs/namei.c:4111 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4111
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f3055fd1379
RSP: 002b:00007f3055614028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f305622d090 RCX: 00007f3055fd1379
RDX: 0000000000000000 RSI: 0000200000002040 RDI: ffffffffffffff9c
RBP: 00007f3056064d68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f305622d128 R14: 00007f305622d090 R15: 00007ffd2f9c4ec8
 </TASK>
INFO: task syz.2.19:5445 blocked for more than 148 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.19        state:D stack:29072 pid: 5445 ppid:  5056 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 rwsem_down_write_slowpath+0xc87/0x1260 kernel/locking/rwsem.c:1165
 inode_lock_nested include/linux/fs.h:822 [inline]
 filename_create+0x208/0x470 fs/namei.c:3843
 do_mkdirat+0xa5/0x5b0 fs/namei.c:4088
 __do_sys_mkdirat fs/namei.c:4113 [inline]
 __se_sys_mkdirat fs/namei.c:4111 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4111
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f9411ddd379
RSP: 002b:00007f9411420028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f9412039090 RCX: 00007f9411ddd379
RDX: 0000000000000000 RSI: 0000200000002040 RDI: ffffffffffffff9c
RBP: 00007f9411e70d68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9412039128 R14: 00007f9412039090 R15: 00007ffc73d92ec8
 </TASK>
INFO: task syz.1.18:5451 blocked for more than 150 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.18        state:D stack:29072 pid: 5451 ppid:  5050 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 rwsem_down_write_slowpath+0xc87/0x1260 kernel/locking/rwsem.c:1165
 inode_lock_nested include/linux/fs.h:822 [inline]
 filename_create+0x208/0x470 fs/namei.c:3843
 do_mkdirat+0xa5/0x5b0 fs/namei.c:4088
 __do_sys_mkdirat fs/namei.c:4113 [inline]
 __se_sys_mkdirat fs/namei.c:4111 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4111
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f10e5d94379
RSP: 002b:00007f10e53d7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f10e5ff0090 RCX: 00007f10e5d94379
RDX: 0000000000000000 RSI: 0000200000002040 RDI: ffffffffffffff9c
RBP: 00007f10e5e27d68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f10e5ff0128 R14: 00007f10e5ff0090 R15: 00007ffea8bac2a8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c31f320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
1 lock held by kswapd0/254:
2 locks held by kworker/u4:3/571:
2 locks held by getty/3949:
 #0: ffff88814cadf098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900026562e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5df/0x1a70 drivers/tty/n_tty.c:2158
1 lock held by syz.0.17/5359:
1 lock held by syz.0.17/5367:
 #0: ffff88805602c188 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
 #0: ffff88805602c188 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x208/0x470 fs/namei.c:3843
1 lock held by syz.4.21/5413:
1 lock held by syz.4.21/5419:
 #0: ffff88805408c188 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
 #0: ffff88805408c188 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x208/0x470 fs/namei.c:3843
1 lock held by syz.3.20/5433:
1 lock held by syz.3.20/5436:
 #0: ffff88805408c6d0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
 #0: ffff88805408c6d0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x208/0x470 fs/namei.c:3843
2 locks held by syz.2.19/5440:
1 lock held by syz.2.19/5445:
 #0: ffff88805602c6d0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
 #0: ffff88805602c6d0 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x208/0x470 fs/namei.c:3843
2 locks held by syz.1.18/5448:
1 lock held by syz.1.18/5451:
 #0: ffff88805408cc18 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
 #0: ffff88805408cc18 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x208/0x470 fs/namei.c:3843
1 lock held by syz.5.22/5728:
1 lock held by syz.5.22/5729:
 #0: ffff88805408d160 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
 #0: ffff88805408d160 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x208/0x470 fs/namei.c:3843
1 lock held by syz.6.23/5802:
1 lock held by syz.6.23/5806:
 #0: ffff88805602cc18 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
 #0: ffff88805602cc18 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x208/0x470 fs/namei.c:3843