INFO: task syz.2.19:6672 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:25368 pid:6672  tgid:6671  ppid:6651   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x1539/0x5080 kernel/sched/core.c:6907
 __schedule_loop kernel/sched/core.c:6989 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7004
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
 rwsem_down_read_slowpath+0x61e/0x920 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+0x3aa/0xba0 fs/jfs/jfs_dmap.c:790
 diNewExt+0x9b0/0x3150 fs/jfs/jfs_imap.c:2261
 diAllocExt fs/jfs/jfs_imap.c:1952 [inline]
 diAllocAG+0xeb1/0x1db0 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+0x1e1/0xb00 fs/jfs/namei.c:226
 vfs_mkdir+0x413/0x630 fs/namei.c:5233
 filename_mkdirat+0x285/0x510 fs/namei.c:5266
 __do_sys_mkdirat fs/namei.c:5287 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5284
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f277159a679
RSP: 002b:00007f27723dd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f2771805fa0 RCX: 00007f277159a679
RDX: 0000000000000408 RSI: 0000200000000300 RDI: 0000000000000004
RBP: 00007f277162dee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2771806038 R14: 00007f2771805fa0 R15: 00007ffc3b30dc18
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: 
ffffffff8e7601a0
 (
rcu_read_lock
){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
4 locks held by kworker/u8:3/37:
 #0: 
ffff88813ff4c148
 (
(wq_completion)events_unbound
){+.+.}-{0:0}
, at: process_one_work+0x855/0x15a0 kernel/workqueue.c:3254
 #1: 
ffffc90000ad7c40
 (
(linkwatch_work).work
){+.+.}-{0:0}
, at: process_one_work+0x87c/0x15a0 kernel/workqueue.c:3255
 #2: 
ffffffff8fbbfa08
 (
rtnl_mutex
){+.+.}-{4:4}
, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:303
 #3: ffffffff8e766438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
 #3: ffffffff8e766438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961
1 lock held by klogd/5184:
2 locks held by getty/5582:
 #0: ffff888036ecc0a0 (&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+0x45c/0x13c0 drivers/tty/n_tty.c:2211
1 lock held by syz.0.17/6626:
1 lock held by syz.1.18/6649:
1 lock held by syz.2.19/6673:
5 locks held by syz.3.20/6703:
 #0: ffff8880658b0420 (
sb_writers
#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
 #1: ffff88805fa217c8 (&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+0x200/0x370 fs/namei.c:4922
 #2: 
ffff88806ef58920
 (
&(imap->im_aglock[index])
){+.+.}-{4:4}
, at: diAlloc+0x1b5/0x1680 fs/jfs/jfs_imap.c:-1
 #3: 
ffff88805fa21cb0
 (
&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+0x7a8/0x1db0 fs/jfs/jfs_imap.c:1669
 #4: 
ffff88805fa225d8
 (&jfs_ip->rdwrlock#2/2){++++}-{4:4}, at: dbAlloc+0x3aa/0xba0 fs/jfs/jfs_dmap.c:790
2 locks held by syz.3.20/6704:
5 locks held by syz.4.21/6735:
 #0: 
ffff8880203d8420
 (
sb_writers
#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
 #1: ffff88805f8297c8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1073 [inline]
 #1: ffff88805f8297c8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2923 [inline]
 #1: ffff88805f8297c8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2934 [inline]
 #1: ffff88805f8297c8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: filename_create+0x200/0x370 fs/namei.c:4922
 #2: ffff88805c620920 (
&(imap->im_aglock[index])
){+.+.}-{4:4}
, at: diAlloc+0x1b5/0x1680 fs/jfs/jfs_imap.c:-1
 #3: 
ffff88805f829cb0
 (
&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+0x7a8/0x1db0 fs/jfs/jfs_imap.c:1669
 #4: 
ffff88805f82a5d8 (&jfs_ip->rdwrlock#2/2){++++}-{4:4}
, at: dbAlloc+0x3aa/0xba0 fs/jfs/jfs_dmap.c:790
2 locks held by syz.4.21/6736:
5 locks held by syz.5.22/6773:
 #0: