INFO: task syz.2.19:6064 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.19        state:D
 stack:24744 pid:6064  tgid:6063  ppid:6044   task_flags:0x400140 flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5254 [inline]
 __schedule+0x17c4/0x4d60 kernel/sched/core.c:6862
 __schedule_loop kernel/sched/core.c:6944 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6959
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7016
 rwsem_down_read_slowpath+0x5fd/0x8f0 kernel/locking/rwsem.c:1086
 __down_read_common kernel/locking/rwsem.c:1261 [inline]
 __down_read kernel/locking/rwsem.c:1274 [inline]
 down_read_nested+0x9a/0x2f0 kernel/locking/rwsem.c:1663
 dbAlloc+0x3a7/0xba0 fs/jfs/jfs_dmap.c:790
 diNewExt+0x9af/0x3150 fs/jfs/jfs_imap.c:2261
 diAllocExt fs/jfs/jfs_imap.c:1952 [inline]
 diAllocAG+0xe86/0x1df0 fs/jfs/jfs_imap.c:1669
 diAlloc+0x1d5/0x1680 fs/jfs/jfs_imap.c:1590
 ialloc+0x8c/0x8f0 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x193/0xa70 fs/jfs/namei.c:225
 vfs_mkdir+0x306/0x510 fs/namei.c:4453
 do_mkdirat+0x247/0x590 fs/namei.c:4486
 __do_sys_mkdirat fs/namei.c:4503 [inline]
 __se_sys_mkdirat fs/namei.c:4501 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4501
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3ecb78efc9
RSP: 002b:00007f3ecc62e038 EFLAGS: 00000246
 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f3ecb9e5fa0 RCX: 00007f3ecb78efc9
RDX: 0000000000000408 RSI: 0000200000000300 RDI: 0000000000000004
RBP: 00007f3ecb811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3ecb9e6038 R14: 00007f3ecb9e5fa0 R15: 00007ffeb4c9ec08
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: 
ffffffff8df3d6e0
 (
rcu_read_lock
){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5589:
 #0: 
ffff88814d65d0a0
 (
&tty->ldisc_sem
){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900036bb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz.0.17/6012:
1 lock held by syz.1.18/6036:
5 locks held by syz.2.19/6064:
 #0: ffff888029bba420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:508
 #1: ffff8880753e0578 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
 #1: ffff8880753e0578 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: filename_create+0x1f8/0x3c0 fs/namei.c:4226
 #2: ffff88805e1a0920 (&(imap->im_aglock[index])){+.+.}-{4:4}, at: diAlloc+0x1b5/0x1680 fs/jfs/jfs_imap.c:-1
 #3: ffff8880590b6f18 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diNewIAG fs/jfs/jfs_imap.c:2617 [inline]
 #3: ffff8880590b6f18 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 #3: ffff8880590b6f18 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diAllocAG+0x7ad/0x1df0 fs/jfs/jfs_imap.c:1669
 #4: ffff8880590b65f0 (&jfs_ip->rdwrlock#2/2){++++}-{4:4}
, at: dbAlloc+0x3a7/0xba0 fs/jfs/jfs_dmap.c:790
2 locks held by syz.2.19/6065:
5 locks held by syz.3.20/6089:
 #0: 
ffff88807ab10420
 (
sb_writers#12
){.+.+}-{0:0}
, at: mnt_want_write+0x41/0x90 fs/namespace.c:508
 #1: 
ffff8880753e3c68
 (
&type->i_mutex_dir_key
#8
/1
){+.+.}-{4:4}
, at: inode_lock_nested include/linux/fs.h:1025 [inline]
, at: filename_create+0x1f8/0x3c0 fs/namei.c:4226
 #2: 
ffff8880791c8920
 (&(imap->im_aglock[index])){+.+.}-{4:4}
, at: diAlloc+0x1b5/0x1680 fs/jfs/jfs_imap.c:-1
 #3: ffff8880753e2f00 (
&jfs_ip->rdwrlock
/1
){++++}-{4:4}
, at: diNewIAG fs/jfs/jfs_imap.c:2617 [inline]
, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
, at: diAllocAG+0x7ad/0x1df0 fs/jfs/jfs_imap.c:1669
 #4: 
ffff8880753e25d8
 (
&jfs_ip->rdwrlock#2/2){++++}-{4:4}, at: dbAlloc+0x3a7/0xba0 fs/jfs/jfs_dmap.c:790
2 locks held by syz.3.20/6090:
5 locks held by syz.4.21/6127:
 #0: ffff88807e1de420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:508
 #1: ffff888059164590
 (
&type->i_mutex_dir_key
#8
/1
){+.+.}-{4:4}
, at: inode_lock_nested include/linux/fs.h:1025 [inline]
, at: filename_create+0x1f8/0x3c0 fs/namei.c:4226
 #2: 
ffff88807efa0920
 (&(imap->im_aglock[index])
){+.+.}-{4:4}
, at: diAlloc+0x1b5/0x1680 fs/jfs/jfs_imap.c:-1
 #3: 
ffff888059163828
 (
&jfs_ip->rdwrlock
/1
){++++}-{4:4}
, at: diNewIAG fs/jfs/jfs_imap.c:2617 [inline]
, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
, at: diAllocAG+0x7ad/0x1df0 fs/jfs/jfs_imap.c:1669
 #4: ffff888059162f00 (
&jfs_ip->rdwrlock
#2
/2){++++}-{4:4}, at: dbAlloc+0x3a7/0xba0 fs/jfs/jfs_dmap.c:790
2 locks held by syz.4.21/6128:
5 locks held by syz.5.22/6160:
 #0: 
ffff888062760420
 (
sb_writers
#12
){.+.+}-{0:0}
, at: mnt_want_write+0x41/0x90 fs/namespace.c:508