INFO: task syz-executor.3:7592 blocked for more than 143 seconds. Not tainted 6.7.0-rc4-syzkaller-gd46efae31672 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:0 pid:7592 tgid:7590 ppid:6149 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+0xc68/0x12d0 fs/ext4/xattr.c:2456 ext4_xattr_set+0x1e0/0x354 fs/ext4/xattr.c:2558 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3d8/0x400 fs/xattr.c:201 __vfs_setxattr_noperm+0x110/0x528 fs/xattr.c:235 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:296 vfs_setxattr+0x1a8/0x344 fs/xattr.c:322 do_setxattr fs/xattr.c:630 [inline] setxattr+0x208/0x29c fs/xattr.c:653 path_setxattr+0x17c/0x258 fs/xattr.c:672 __do_sys_lsetxattr fs/xattr.c:695 [inline] __se_sys_lsetxattr fs/xattr.c:691 [inline] __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:691 __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: ffff80008e6c4680 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:300 3 locks held by kworker/u4:9/570: #0: ffff0000c1c3a138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2603 #1: ffff8000983a7c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2605 #2: ffff0000c13fe0e0 (&type->s_umount_key#42){.+.+}-{3:3}, at: super_trylock_shared+0x28/0xe4 fs/super.c:610 1 lock held by klogd/5704: 1 lock held by udevd/5715: #0: ffff0000ca0374c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:788 2 locks held by getty/5863: #0: ffff0000d28e50a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800094e402f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2201 6 locks held by syz-executor.3/7592: #0: ffff0000d5424418 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:404 #1: ffff0000dbf05e00 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #1: ffff0000dbf05e00 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: vfs_setxattr+0x17c/0x344 fs/xattr.c:321 #2: ffff0000dbf05ac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] #2: ffff0000dbf05ac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x1dc/0x12d0 fs/ext4/xattr.c:2371 #3: ffff80008e805110 (dquot_srcu){.+.+}-{0:0}, at: srcu_lock_acquire+0x10/0x4c include/linux/srcu.h:115 #4: ffff0001297180a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x54/0x240 fs/quota/dquot.c:505 #5: ffff0000d5424210 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x84/0x188 fs/quota/quota_v2.c:356 1 lock held by syz-executor.3/7732: #0: ffff0000ca0374c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:788 1 lock held by syz-executor.1/8473: #0: ffff0000ca0374c8 (&disk->open_mutex){+.+.}-{3:3}, at: sync_bdevs+0x150/0x28c block/bdev.c:1062 =============================================