INFO: task kworker/1:11:7729 blocked for more than 143 seconds. Not tainted 6.0.0-rc4-syzkaller-00137-g506357871c18 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:11 state:D stack:24864 pid: 7729 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5182 [inline] __schedule+0xadf/0x52b0 kernel/sched/core.c:6494 schedule+0xda/0x1b0 kernel/sched/core.c:6570 scsi_remove_host+0x348/0x440 drivers/scsi/hosts.c:199 quiesce_and_remove_host drivers/usb/storage/usb.c:867 [inline] usb_stor_disconnect+0x115/0x260 drivers/usb/storage/usb.c:1087 usb_unbind_interface+0x1d8/0x8e0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:550 [inline] device_remove+0x11f/0x170 drivers/base/dd.c:542 __device_release_driver drivers/base/dd.c:1249 [inline] device_release_driver_internal+0x4a1/0x700 drivers/base/dd.c:1275 bus_remove_device+0x2e3/0x590 drivers/base/bus.c:529 device_del+0x4f3/0xc80 drivers/base/core.c:3704 usb_disable_device+0x356/0x7a0 drivers/usb/core/message.c:1419 usb_disconnect.cold+0x259/0x6ed drivers/usb/core/hub.c:2235 hub_port_connect drivers/usb/core/hub.c:5197 [inline] hub_port_connect_change drivers/usb/core/hub.c:5497 [inline] port_event drivers/usb/core/hub.c:5653 [inline] hub_event+0x1f86/0x4610 drivers/usb/core/hub.c:5735 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8bf85db0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8bf85ab0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/28: #0: ffffffff8bf86900 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6492 2 locks held by getty/3287: #0: ffff88814b1f6098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90001c582f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef0/0x13e0 drivers/tty/n_tty.c:2177 3 locks held by kworker/u4:8/4898: #0: ffff8880b9a3a018 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:544 #1: ffffc9000a5efda8 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264 #2: ffff8880b9a283d8 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:999 5 locks held by kworker/1:11/7729: #0: ffff8880176eb538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880176eb538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff8880176eb538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff8880176eb538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff8880176eb538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff8880176eb538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260 #1: ffffc9000529fda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264 #2: ffff88814798a190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline] #2: ffff88814798a190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1bc/0x4610 drivers/usb/core/hub.c:5681 #3: ffff888045a03190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline] #3: ffff888045a03190 (&dev->mutex){....}-{3:3}, at: usb_disconnect.cold+0x43/0x6ed drivers/usb/core/hub.c:2226 #4: ffff888077067118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline] #4: ffff888077067118 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1073 [inline] #4: ffff888077067118 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa0/0x700 drivers/base/dd.c:1272 1 lock held by kworker/0:13/9409: 2 locks held by kworker/u4:12/10068: #0: ffff8880b9a3a018 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:552 [inline] #0: ffff8880b9a3a018 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x8c/0x120 kernel/sched/core.c:537 #1: ffff8880b9a277c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3e7/0x4e0 kernel/sched/psi.c:885 3 locks held by udevd/10976: #0: ffff888016e19888 (&of->mutex){+.+.}-{3:3}, at: kernfs_file_read_iter fs/kernfs/file.c:253 [inline] #0: ffff888016e19888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_read_iter+0x189/0x710 fs/kernfs/file.c:300 #1: ffff88801286f2c0 (kn->active#52){++++}-{0:0}, at: kernfs_file_read_iter fs/kernfs/file.c:254 [inline] #1: ffff88801286f2c0 (kn->active#52){++++}-{0:0}, at: kernfs_fop_read_iter+0x1ac/0x710 fs/kernfs/file.c:300 #2: ffff888045a03190 (&dev->mutex){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:840 [inline] #2: ffff888045a03190 (&dev->mutex){....}-{3:3}, at: read_descriptors+0x3c/0x2c0 drivers/usb/core/sysfs.c:873 1 lock held by syz-executor.5/21228: #0: ffffffff8be5b848 (sched_core_mutex){+.+.}-{3:3}, at: sched_core_get+0x37/0xa0 kernel/sched/core.c:404 1 lock held by syz-executor.5/21234: 3 locks held by syz-executor.5/21236: #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: ioctl_setflags fs/ioctl.c:725 [inline] #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: do_vfs_ioctl+0xe27/0x15c0 fs/ioctl.c:839 #1: ffff88806c71d4c0 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88806c71d4c0 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: vfs_fileattr_set+0x148/0xbe0 fs/ioctl.c:681 #2: ffff88807f12abd8 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ind_migrate+0x237/0x840 fs/ext4/migrate.c:624 2 locks held by syz-executor.5/21238: #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: ksys_pwrite64 fs/read_write.c:693 [inline] #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: __do_sys_pwrite64 fs/read_write.c:703 [inline] #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: __se_sys_pwrite64 fs/read_write.c:700 [inline] #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: __x64_sys_pwrite64+0x1f7/0x250 fs/read_write.c:700 #1: ffff88806c71d4c0 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88806c71d4c0 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:264 2 locks held by syz-executor.5/21243: #0: ffff888073dd41a8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe3/0x100 fs/file.c:1036 #1: ffff88806c71d4c0 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:766 [inline] #1: ffff88806c71d4c0 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_llseek+0x260/0x2e0 fs/ext4/file.c:901 2 locks held by syz-executor.1/21225: #0: ffffffff8be5b848 (sched_core_mutex){+.+.}-{3:3}, at: sched_core_get+0x37/0xa0 kernel/sched/core.c:404 #1: ffffffff8bf915b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline] #1: ffffffff8bf915b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x562/0x670 kernel/rcu/tree_exp.h:940 4 locks held by syz-executor.1/21235: #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: ioctl_setflags fs/ioctl.c:725 [inline] #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: do_vfs_ioctl+0xe27/0x15c0 fs/ioctl.c:839 #1: ffff88807028c780 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88807028c780 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: vfs_fileattr_set+0x148/0xbe0 fs/ioctl.c:681 #2: ffff88807f12abd8 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ind_migrate+0x237/0x840 fs/ext4/migrate.c:624 #3: ffffffff8bf915b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline] #3: ffffffff8bf915b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x24a/0x670 kernel/rcu/tree_exp.h:940 2 locks held by syz-executor.1/21239: #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: ksys_pwrite64 fs/read_write.c:693 [inline] #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: __do_sys_pwrite64 fs/read_write.c:703 [inline] #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: __se_sys_pwrite64 fs/read_write.c:700 [inline] #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: __x64_sys_pwrite64+0x1f7/0x250 fs/read_write.c:700 #1: ffff88807028c780 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88807028c780 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:264 2 locks held by syz-executor.1/21241: #0: ffff888074c266a8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe3/0x100 fs/file.c:1036 #1: ffff88807028c780 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:766 [inline] #1: ffff88807028c780 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_llseek+0x260/0x2e0 fs/ext4/file.c:901 1 lock held by syz-executor.0/21226: #0: ffffffff8be5b848 (sched_core_mutex){+.+.}-{3:3}, at: sched_core_get+0x37/0xa0 kernel/sched/core.c:404 3 locks held by syz-executor.0/21237: #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: ioctl_setflags fs/ioctl.c:725 [inline] #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: do_vfs_ioctl+0xe27/0x15c0 fs/ioctl.c:839 #1: ffff88803862e640 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88803862e640 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: vfs_fileattr_set+0x148/0xbe0 fs/ioctl.c:681 #2: ffff88807f12abd8 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ind_migrate+0x237/0x840 fs/ext4/migrate.c:624 2 locks held by syz-executor.0/21240: #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: ksys_pwrite64 fs/read_write.c:693 [inline] #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: __do_sys_pwrite64 fs/read_write.c:703 [inline] #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: __se_sys_pwrite64 fs/read_write.c:700 [inline] #0: ffff88814b260460 (sb_writers#5){.+.+}-{0:0}, at: __x64_sys_pwrite64+0x1f7/0x250 fs/read_write.c:700 #1: ffff88803862e640 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] ffff88803862e640 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:264 2 locks held by syz-executor.0/21242: #0: ffff888073dd4ba8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe3/0x100 fs/file.c:1036 #1: ffff88803862e640 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:766 [inline] #1: ffff88803862e640 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_llseek+0x260/0x2e0 fs/ext4/file.c:901 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.0.0-rc4-syzkaller-00137-g506357871c18 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xc18/0xf50 kernel/hung_task.c:369 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x6f/0xb0 drivers/acpi/processor_idle.c:112