INFO: task syz-executor.1:27717 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc7-syzkaller-00003-gfbafc3e621c3 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:22736 pid:27717 tgid:27716 ppid:5101   flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 io_schedule+0xbe/0x130 kernel/sched/core.c:8998
 bit_wait_io+0x16/0xe0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0x112/0x1a0 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0xdb/0x110 kernel/sched/wait_bit.c:117
 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline]
 __lock_buffer+0x67/0x70 fs/buffer.c:71
 lock_buffer include/linux/buffer_head.h:404 [inline]
 ext4_quota_write+0x573/0x650 fs/ext4/super.c:7251
 qtree_write_dquot+0x268/0x570 fs/quota/quota_tree.c:431
 v2_write_dquot+0x1d6/0x250 fs/quota/quota_v2.c:358
 dquot_commit+0x36d/0x590 fs/quota/dquot.c:512
 ext4_write_dquot+0x259/0x320 fs/ext4/super.c:6877
 ext4_mark_dquot_dirty fs/ext4/super.c:6925 [inline]
 ext4_mark_dquot_dirty+0x113/0x1b0 fs/ext4/super.c:6919
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty fs/quota/dquot.c:410 [inline]
 dquot_alloc_inode+0x35c/0x730 fs/quota/dquot.c:1780
 ext4_xattr_inode_alloc_quota fs/ext4/xattr.c:932 [inline]
 ext4_xattr_set_entry+0xa25/0x3ce0 fs/ext4/xattr.c:1715
 ext4_xattr_block_set+0x678/0x3180 fs/ext4/xattr.c:1970
 ext4_xattr_set_handle+0xd70/0x1420 fs/ext4/xattr.c:2456
 ext4_xattr_set+0x149/0x370 fs/ext4/xattr.c:2558
 ext4_xattr_user_set+0xb9/0xf0 fs/ext4/xattr_user.c:41
 __vfs_setxattr+0x173/0x1d0 fs/xattr.c:201
 __vfs_setxattr_noperm+0x127/0x5e0 fs/xattr.c:235
 __vfs_setxattr_locked+0x17e/0x250 fs/xattr.c:296
 vfs_setxattr+0x146/0x350 fs/xattr.c:322
 do_setxattr+0x142/0x170 fs/xattr.c:630
 setxattr+0x159/0x170 fs/xattr.c:653
 path_setxattr+0x175/0x1d0 fs/xattr.c:672
 __do_sys_setxattr fs/xattr.c:688 [inline]
 __se_sys_setxattr fs/xattr.c:684 [inline]
 __x64_sys_setxattr+0xc4/0x160 fs/xattr.c:684
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fea4ce7cce9
RSP: 002b:00007fea4dca50c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007fea4cf9bf80 RCX: 00007fea4ce7cce9
RDX: 0000000020000380 RSI: 0000000020000340 RDI: 00000000200002c0
RBP: 00007fea4cec947a R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000ffed R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fea4cf9bf80 R15: 00007ffcb0c16e78
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8cfab760 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #0: ffffffff8cfab760 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #0: ffffffff8cfab760 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
2 locks held by kworker/u4:10/2881:
 #0: ffff888013071938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2602
 #1: ffffc9000abc7d80 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2603
2 locks held by getty/4824:
 #0: ffff88802680d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201
3 locks held by syz-executor.3/5100:
2 locks held by syz-executor.2/5102:
 #0: ffff8880abe0c0e0 (&type->s_umount_key#62){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff8880abe0c0e0 (&type->s_umount_key#62){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff8880abe0c0e0 (&type->s_umount_key#62){+.+.}-{3:3}, at: deactivate_super+0xd6/0x100 fs/super.c:516
 #1: ffffffff8cfb71b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline]
 #1: ffffffff8cfb71b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x6b1/0x800 kernel/rcu/tree_exp.h:996
6 locks held by syz-executor.1/27717:
 #0: ffff888027918418 (sb_writers#4){.+.+}-{0:0}, at: path_setxattr+0xc3/0x1d0 fs/xattr.c:670
 #1: ffff88808ce66800 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #1: ffff88808ce66800 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: vfs_setxattr+0x123/0x350 fs/xattr.c:321
 #2: ffff88808ce664c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
 #2: ffff88808ce664c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x159/0x1420 fs/ext4/xattr.c:2371
 #3: ffffffff8d1c5930 (dquot_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:116 [inline]
 #3: ffffffff8d1c5930 (dquot_srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:215 [inline]
 #3: ffffffff8d1c5930 (dquot_srcu){.+.+}-{0:0}, at: dquot_alloc_inode+0x20b/0x730 fs/quota/dquot.c:1758
 #4: ffff888085a9eea8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x51/0x590 fs/quota/dquot.c:505
 #5: ffff888027918210 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x14b/0x250 fs/quota/quota_v2.c:356
3 locks held by kworker/u4:0/313:
1 lock held by syz-executor.1/3761:
 #0: ffff888085af7a10 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #0: ffff888085af7a10 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x260 net/socket.c:658
4 locks held by syz-executor.0/3767:
2 locks held by syz-executor.5/3771:

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc7-syzkaller-00003-gfbafc3e621c3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xf87/0x1210 kernel/hung_task.c:379
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3775 Comm: syz-executor.2 Not tainted 6.7.0-rc7-syzkaller-00003-gfbafc3e621c3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200
Code: 36 5f da 02 66 0f 1f 44 00 00 f3 0f 1e fa 48 8b be b0 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 <f3> 0f 1e fa 65 48 8b 14 25 c0 bc 03 00 65 8b 05 e4 4a 7c 7e a9 00
RSP: 0018:ffffc900037bfe18 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff888088ea34b0 RCX: ffffffff81f0c772
RDX: 1ffff1101450d89a RSI: ffffffff81f0c780 RDI: ffff8880a286c4d0
RBP: ffff888085afe758 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888088ea34d8 R15: ffff888088ea34d0
FS:  00007f3c079756c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3c07974f28 CR3: 00000000719f1000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 fsnotify_name include/linux/fsnotify.h:33 [inline]
 fsnotify_dirent include/linux/fsnotify.h:42 [inline]
 fsnotify_mkdir include/linux/fsnotify.h:289 [inline]
 vfs_mkdir+0x618/0x820 fs/namei.c:4108
 do_mkdirat+0x2fd/0x3a0 fs/namei.c:4129
 __do_sys_mkdirat fs/namei.c:4144 [inline]
 __se_sys_mkdirat fs/namei.c:4142 [inline]
 __x64_sys_mkdirat+0x115/0x170 fs/namei.c:4142
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f3c06c7b7e7
Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3c07974ee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3c06c7b7e7
RDX: 00000000000001ff RSI: 0000000020000340 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000340
R13: 00007f3c07974f40 R14: 0000000000000000 R15: 0000000000000000
 </TASK>