INFO: task syz.4.866:6782 blocked for more than 143 seconds. Tainted: G W 6.1.120-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.866 state:D stack:0 pid:6782 ppid:4295 flags:0x00000001 Call trace: __switch_to+0x308/0x598 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5241 [inline] __schedule+0xef4/0x1d44 kernel/sched/core.c:6558 schedule+0xc4/0x170 kernel/sched/core.c:6634 io_schedule+0x8c/0x188 kernel/sched/core.c:8786 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:69 lock_buffer include/linux/buffer_head.h:397 [inline] ext4_quota_write+0x36c/0x54c fs/ext4/super.c:7179 qtree_write_dquot+0x1e0/0x4d8 fs/quota/quota_tree.c:462 v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:361 dquot_commit+0x14c/0x240 fs/quota/dquot.c:514 ext4_write_dquot+0x1b4/0x314 fs/ext4/super.c:6770 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6830 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412 __dquot_free_space+0x840/0xce4 fs/quota/dquot.c:1942 dquot_free_space_nodirty include/linux/quotaops.h:379 [inline] ext4_xattr_inode_free_quota+0x11c/0x188 fs/ext4/xattr.c:899 ext4_xattr_set_entry+0xb2c/0x1694 fs/ext4/xattr.c:1677 ext4_xattr_block_set+0x634/0x2d10 fs/ext4/xattr.c:1910 ext4_xattr_set_handle+0xae8/0x1294 fs/ext4/xattr.c:2404 ext4_xattr_set+0x220/0x340 fs/ext4/xattr.c:2506 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182 __vfs_setxattr_noperm+0x110/0x528 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x1a8/0x344 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x230/0x294 fs/xattr.c:617 path_setxattr+0x17c/0x258 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:648 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffff800015c55570 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xd10 kernel/rcu/tasks.h:543 1 lock held by rcu_tasks_trace/13: #0: ffff800015c55d90 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xd10 kernel/rcu/tasks.h:543 1 lock held by khungtaskd/28: #0: ffff800015c553a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349 2 locks held by getty/4056: #0: ffff0000d653f098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001d8102f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1214 drivers/tty/n_tty.c:2198 1 lock held by syz-executor/4296: #0: ffff0000f53ea0e0 (&type->s_umount_key#87){+.+.}-{3:3}, at: deactivate_super+0xe8/0x110 fs/super.c:362 1 lock held by syz-executor/4301: #0: ffff0000d9cce0e0 (&type->s_umount_key#30){++++}-{3:3}, at: deactivate_super+0xe8/0x110 fs/super.c:362 3 locks held by syz-executor/4303: 3 locks held by kworker/0:4/4343: #0: ffff0000c45b6938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265 #1: ffff800021907c20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267 #2: ffff0000d1247190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] #2: ffff0000d1247190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1b0/0x42e4 drivers/usb/core/hub.c:5801 4 locks held by kworker/u4:10/4565: 2 locks held by kworker/u4:14/4782: #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265 #1: ffff800021e27c20 ((quota_release_work).work){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267 6 locks held by syz.4.866/6782: #0: ffff0000d294a460 (sb_writers#3){++++}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:393 #1: ffff0000f4d09810 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff0000f4d09810 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: vfs_setxattr+0x17c/0x344 fs/xattr.c:308 #2: ffff0000f4d094d8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] #2: ffff0000f4d094d8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x1e0/0x1294 fs/ext4/xattr.c:2319 #3: ffff800015d88bc8 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:349 #4: ffff0000f4ccc5e8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x54/0x240 fs/quota/dquot.c:507 #5: ffff0000d294a208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x84/0x188 fs/quota/quota_v2.c:359 1 lock held by syz.3.906/6882: #0: ffff0001085580e0 (&type->s_umount_key#30){++++}-{3:3}, at: do_umount_root fs/namespace.c:1609 [inline] #0: ffff0001085580e0 (&type->s_umount_key#30){++++}-{3:3}, at: do_umount fs/namespace.c:1693 [inline] #0: ffff0001085580e0 (&type->s_umount_key#30){++++}-{3:3}, at: path_umount+0x6e0/0xd64 fs/namespace.c:1802 1 lock held by syz.3.906/6886: #0: ffff0001085580e0 (&type->s_umount_key#30){++++}-{3:3}, at: do_umount_root fs/namespace.c:1609 [inline] #0: ffff0001085580e0 (&type->s_umount_key#30){++++}-{3:3}, at: do_umount fs/namespace.c:1693 [inline] #0: ffff0001085580e0 (&type->s_umount_key#30){++++}-{3:3}, at: path_umount+0x6e0/0xd64 fs/namespace.c:1802 1 lock held by syz.5.1023/7183: #0: ffff0000f5d260e0 (&type->s_umount_key#30){++++}-{3:3}, at: deactivate_super+0xe8/0x110 fs/super.c:362 1 lock held by syz-executor/7213: #0: ffff0000dc76e0e0 (&type->s_umount_key#30){++++}-{3:3}, at: deactivate_super+0xe8/0x110 fs/super.c:362 1 lock held by syz-executor/7388: #0: ffff0000d45420e0 (&type->s_umount_key#30){++++}-{3:3}, at: deactivate_super+0xe8/0x110 fs/super.c:362 1 lock held by syz.8.1168/7603: #0: ffff0000d84360e0 (&type->s_umount_key#30){++++}-{3:3}, at: iterate_supers+0xb0/0x1dc fs/super.c:755 1 lock held by syz.3.1520/8955: 1 lock held by dhcpcd/8977: #0: ffff0000faa98130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1750 [inline] #0: ffff0000faa98130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x4c/0xb58 net/packet/af_packet.c:3263 =============================================