INFO: task syz-executor.1:12358 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc6-syzkaller-gaafe7ad77b91 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:0     pid:12358 tgid:12355 ppid:6146   flags:0x00000005
Call trace:
 __switch_to+0x314/0x560 arch/arm64/kernel/process.c:556
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1354/0x2360 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xb8/0x19c kernel/sched/core.c:6778
 io_schedule+0x8c/0x12c kernel/sched/core.c:8998
 bit_wait_io+0x1c/0xac kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0xcc/0x1e8 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0x194/0x21c kernel/sched/wait_bit.c:117
 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline]
 __lock_buffer+0x78/0xac fs/buffer.c:71
 lock_buffer include/linux/buffer_head.h:404 [inline]
 ext4_quota_write+0x36c/0x54c fs/ext4/super.c:7251
 qtree_write_dquot+0x1dc/0x488 fs/quota/quota_tree.c:431
 v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:358
 dquot_commit+0x14c/0x240 fs/quota/dquot.c:512
 ext4_write_dquot+0x1b4/0x288 fs/ext4/super.c:6877
 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6925
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty fs/quota/dquot.c:410 [inline]
 __dquot_free_space+0x7cc/0xd68 fs/quota/dquot.c:1919
 dquot_free_space_nodirty include/linux/quotaops.h:379 [inline]
 ext4_xattr_inode_free_quota+0x11c/0x188 fs/ext4/xattr.c:948
 ext4_xattr_set_entry+0xcc0/0x30a8 fs/ext4/xattr.c:1749
 ext4_xattr_block_set+0x54c/0x2c24 fs/ext4/xattr.c:1970
 ext4_xattr_set_handle+0xe2c/0x12d0 fs/ext4/xattr.c:2430
 ext4_xattr_set+0x1e0/0x354 fs/ext4/xattr.c:2558
 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
 __vfs_removexattr+0x3bc/0x3e4 fs/xattr.c:519
 __vfs_removexattr_locked+0x1d8/0x380 fs/xattr.c:554
 vfs_removexattr+0xe0/0x23c fs/xattr.c:576
 removexattr+0x148/0x1c4 fs/xattr.c:918
 path_removexattr+0x160/0x23c fs/xattr.c:932
 __do_sys_removexattr fs/xattr.c:946 [inline]
 __se_sys_removexattr fs/xattr.c:943 [inline]
 __arm64_sys_removexattr+0x60/0x78 fs/xattr.c:943
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffff80008e6c48c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:300
2 locks held by kworker/u4:10/2032:
 #0: ffff0000c0021938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2600
 #1: ffff80009c6d7c20 ((quota_release_work).work){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2602
2 locks held by getty/5852:
 #0: ffff0000ccc5c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff800094e802f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.2/6149:
 #0: ffff000126dd40e0 (&type->s_umount_key#29){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff000126dd40e0 (&type->s_umount_key#29){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff000126dd40e0 (&type->s_umount_key#29){++++}-{3:3}, at: deactivate_super+0xd8/0x100 fs/super.c:516
6 locks held by syz-executor.1/12358:
 #0: ffff0000d0e6c418 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:404
 #1: ffff0000df23ca00 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #1: ffff0000df23ca00 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: vfs_removexattr+0xcc/0x23c fs/xattr.c:575
 #2: ffff0000df23c6c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
 #2: ffff0000df23c6c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x1dc/0x12d0 fs/ext4/xattr.c:2371
 #3: ffff80008e805150 (dquot_srcu){.+.+}-{0:0}, at: srcu_lock_acquire+0x10/0x4c include/linux/srcu.h:115
 #4: ffff00012dc1cea8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x54/0x240 fs/quota/dquot.c:505
 #5: ffff0000d0e6c210 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x84/0x188 fs/quota/quota_v2.c:356

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