INFO: task syz.3.20:6558 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.20        state:D stack:25400 pid:6558  tgid:6557  ppid:6536   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5290 [inline]
 __schedule+0x14db/0x5030 kernel/sched/core.c:6902
 __schedule_loop kernel/sched/core.c:6984 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6999
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7056
 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+0x9b/0x2e0 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:226
 vfs_mkdir+0x414/0x630 fs/namei.c:5231
 filename_mkdirat+0x27b/0x500 fs/namei.c:5264
 __do_sys_mkdirat fs/namei.c:5285 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5282
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f600cb8efc9
RSP: 002b:00007f600d9e8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f600cde5fa0 RCX: 00007f600cb8efc9
RDX: 0000000000000408 RSI: 0000200000000300 RDI: 0000000000000004
RBP: 00007f600cc11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f600cde6038 R14: 00007f600cde5fa0 R15: 00007ffc0a57efd8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8e144ce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #0: ffffffff8e144ce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #0: ffffffff8e144ce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
5 locks held by kworker/u8:12/3570:
2 locks held by getty/5583:
 #0: 
ffff8880308530a0
 (
&tty->ldisc_sem
){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460 drivers/tty/n_tty.c:2211
3 locks held by kworker/u9:2/5913:
1 lock held by syz.0.17/6478:
1 lock held by syz.1.18/6503:
1 lock held by syz.2.19/6528:
5 locks held by syz.3.20/6558:
 #0: ffff888032866420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:504
 #1: 
ffff88805b88f358
 (
&type->i_mutex_dir_key
#8
/1
){+.+.}-{4:4}
, at: inode_lock_nested include/linux/fs.h:1073 [inline]
, at: __start_dirop fs/namei.c:2923 [inline]
, at: start_dirop fs/namei.c:2934 [inline]
, at: filename_create+0x1fb/0x360 fs/namei.c:4920
 #2: 
ffff888079b18920
 (
&(imap->im_aglock[index])
){+.+.}-{4:4}
, at: diAlloc+0x1b5/0x1680 fs/jfs/jfs_imap.c:-1
 #3: 
ffff88805b88e5f0 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diNewIAG fs/jfs/jfs_imap.c:2617 [inline]
ffff88805b88e5f0 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
ffff88805b88e5f0 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diAllocAG+0x7ad/0x1df0 fs/jfs/jfs_imap.c:1669
 #4: 
ffff88805b88dcc8
 (
&jfs_ip->rdwrlock
#2
/2
){++++}-{4:4}
, at: dbAlloc+0x3a7/0xba0 fs/jfs/jfs_dmap.c:790
2 locks held by syz.3.20/6559:
5 locks held by syz.4.21/6591:
 #0: 
ffff888051756420
 (
sb_writers
#12
){.+.+}-{0:0}
, at: mnt_want_write+0x41/0x90 fs/namespace.c:504
 #1: ffff888072670ea0 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}
, at: inode_lock_nested include/linux/fs.h:1073 [inline]
, at: __start_dirop fs/namei.c:2923 [inline]
, at: start_dirop fs/namei.c:2934 [inline]
, at: filename_create+0x1fb/0x360 fs/namei.c:4920
 #2: ffff888051740920 (&(imap->im_aglock[index])){+.+.}-{4:4}, at: diAlloc+0x1b5/0x1680 fs/jfs/jfs_imap.c:-1
 #3: 
ffff888072670138 (&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