INFO: task syz-executor.0:6673 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc3-syzkaller-00005-g99bd3cb0d12e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:22072 pid:6673  tgid:6655  ppid:5108   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6817
 io_schedule+0x8c/0x110 kernel/sched/core.c:9023
 bit_wait_io+0x12/0xd0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0xd5/0x530 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0x1d4/0x260 kernel/sched/wait_bit.c:117
 lock_buffer include/linux/buffer_head.h:401 [inline]
 ext4_quota_write+0x380/0x580 fs/ext4/super.c:7240
 qtree_write_dquot+0x24c/0x540 fs/quota/quota_tree.c:431
 v2_write_dquot+0x124/0x190 fs/quota/quota_v2.c:358
 dquot_commit+0x3c8/0x520 fs/quota/dquot.c:512
 ext4_write_dquot+0x1f2/0x2c0 fs/ext4/super.c:6866
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty fs/quota/dquot.c:410 [inline]
 __dquot_free_space+0x9b9/0x1030 fs/quota/dquot.c:1919
 dquot_free_space_nodirty include/linux/quotaops.h:374 [inline]
 ext4_xattr_inode_free_quota+0x125/0x1a0 fs/ext4/xattr.c:948
 ext4_xattr_set_entry+0xfce/0x3fd0 fs/ext4/xattr.c:1749
 ext4_xattr_block_set+0x6a2/0x35e0 fs/ext4/xattr.c:1970
 ext4_xattr_set_handle+0xf04/0x1580 fs/ext4/xattr.c:2430
 ext4_xattr_set+0x241/0x3d0 fs/ext4/xattr.c:2558
 __vfs_removexattr+0x42a/0x460 fs/xattr.c:519
 __vfs_removexattr_locked+0x206/0x410 fs/xattr.c:554
 vfs_removexattr+0x103/0x2b0 fs/xattr.c:576
 ovl_do_removexattr fs/overlayfs/overlayfs.h:329 [inline]
 ovl_removexattr fs/overlayfs/overlayfs.h:337 [inline]
 ovl_make_workdir fs/overlayfs/super.c:742 [inline]
 ovl_get_workdir+0xe90/0x1910 fs/overlayfs/super.c:822
 ovl_fill_super+0x12ca/0x3600 fs/overlayfs/super.c:1390
 vfs_get_super fs/super.c:1273 [inline]
 get_tree_nodev+0xb7/0x140 fs/super.c:1292
 vfs_get_tree+0x90/0x2a0 fs/super.c:1784
 do_new_mount+0x2be/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7faf0fa7dda9
RSP: 002b:00007faf1083c0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007faf0fbac120 RCX: 00007faf0fa7dda9
RDX: 0000000020000080 RSI: 00000000200000c0 RDI: 0000000000000000
RBP: 00007faf0faca47a R08: 0000000020000200 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007faf0fbac120 R15: 00007ffd8bb1aca8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
3 locks held by kworker/u4:8/2869:
2 locks held by kworker/u4:10/2887:
 #0: ffff888014c8d938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
 #0: ffff888014c8d938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
 #1: ffffc9000a287d20 ((quota_release_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
 #1: ffffc9000a287d20 ((quota_release_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
2 locks held by getty/4826:
 #0: ffff8880303780a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.3/5099:
 #0: ffff88807c9720e0 (&type->s_umount_key#30){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88807c9720e0 (&type->s_umount_key#30){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88807c9720e0 (&type->s_umount_key#30){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:509
7 locks held by syz-executor.0/6673:
 #0: ffff88807baec0e0 (&type->s_umount_key#57/1){+.+.}-{3:3}, at: alloc_super+0x20e/0x8f0 fs/super.c:345
 #1: ffff88807dc54420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
 #2: ffff888077f4ca00 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #2: ffff888077f4ca00 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: vfs_removexattr+0xec/0x2b0 fs/xattr.c:575
 #3: ffff888077f4c6c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
 #3: ffff888077f4c6c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x277/0x1580 fs/ext4/xattr.c:2371
 #4: ffffffff8e288db0 (dquot_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:116 [inline]
 #4: ffffffff8e288db0 (dquot_srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:215 [inline]
 #4: ffffffff8e288db0 (dquot_srcu){.+.+}-{0:0}, at: __dquot_free_space+0x1e8/0x1030 fs/quota/dquot.c:1893
 #5: ffff88803747a0a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x5b/0x520 fs/quota/dquot.c:505
 #6: ffff88807dc54210 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x90/0x190 fs/quota/quota_v2.c:356

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc3-syzkaller-00005-g99bd3cb0d12e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 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+0xfaf/0xff0 kernel/hung_task.c:379
 kthread+0x2ef/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4501 Comm: klogd Not tainted 6.8.0-rc3-syzkaller-00005-g99bd3cb0d12e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:200
Code: 89 fb e8 23 00 00 00 48 8b 3d b4 5b 19 0c 48 89 de 5b e9 b3 7c 53 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d 80 58 70 7e 65 8b 15 81 58 70
RSP: 0018:ffffc900030ef738 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880b953d300 RCX: 0000006273f0075b
RDX: ffff888043ac8000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8134ede1 R09: fffff5200061defc
R10: dffffc0000000000 R11: fffff5200061defc R12: ffffc900030ef7c0
R13: 1ffff9200061def4 R14: 000000615fa6a4a8 R15: 000000000000a3b3
FS:  00007fd51c04a380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe4fa783ae0 CR3: 000000002c260000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 sched_clock+0x4a/0x70 arch/x86/kernel/tsc.c:284
 sched_clock_cpu+0x76/0x490 kernel/sched/clock.c:394
 update_rq_clock+0xed/0x8a0 kernel/sched/core.c:766
 ttwu_queue kernel/sched/core.c:4047 [inline]
 try_to_wake_up+0x871/0x1470 kernel/sched/core.c:4369
 autoremove_wake_function+0x16/0x110 kernel/sched/wait.c:384
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock+0x130/0x1e0 kernel/sched/wait.c:106
 sock_def_readable+0x1ea/0x450 net/core/sock.c:3343
 unix_dgram_sendmsg+0x161b/0x2200 net/unix/af_unix.c:2112
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191
 __do_sys_sendto net/socket.c:2203 [inline]
 __se_sys_sendto net/socket.c:2199 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2199
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7fd51c1ac9b5
Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffc34d545f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fd51c1ac9b5
RDX: 0000000000000050 RSI: 0000564880f71110 RDI: 0000000000000003
RBP: 0000564880f6a910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013
R13: 00007fd51c33a212 R14: 00007ffc34d546f8 R15: 0000000000000000
 </TASK>