INFO: task kworker/0:2:19190 blocked for more than 143 seconds. Not tainted 6.5.0-rc6-syzkaller-00036-g4853c74bd7ab #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:2 state:D stack:22376 pid:19190 ppid:2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6710 schedule+0xc3/0x180 kernel/sched/core.c:6786 usb_kill_urb+0x1c9/0x300 drivers/usb/core/urb.c:728 usb_start_wait_urb+0x1b0/0x520 drivers/usb/core/message.c:64 usb_internal_control_msg drivers/usb/core/message.c:102 [inline] usb_control_msg+0x2b1/0x4c0 drivers/usb/core/message.c:153 usb_get_descriptor+0xb7/0x3c0 drivers/usb/core/message.c:793 usb_get_device_descriptor+0x8e/0xe0 drivers/usb/core/message.c:1072 hub_port_init+0x101a/0x23f0 drivers/usb/core/hub.c:4984 hub_port_connect drivers/usb/core/hub.c:5351 [inline] hub_port_connect_change drivers/usb/core/hub.c:5566 [inline] port_event drivers/usb/core/hub.c:5726 [inline] hub_event+0x2a50/0x52c0 drivers/usb/core/hub.c:5808 process_one_work+0x92c/0x12c0 kernel/workqueue.c:2600 worker_thread+0xa63/0x1210 kernel/workqueue.c:2751 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/13: #0: ffffffff8d3295b0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522 1 lock held by rcu_tasks_trace/14: #0: ffffffff8d329970 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522 1 lock held by khungtaskd/28: #0: ffffffff8d3293e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 1 lock held by udevd/4469: 2 locks held by getty/4771: #0: ffff88802d1ba098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900015c02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1dc0 drivers/tty/n_tty.c:2187 2 locks held by syz-fuzzer/5580: 5 locks held by kworker/0:2/19190: #0: ffff8881400a0138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x7e3/0x12c0 kernel/workqueue.c:2572 #1: ffffc9000338fd00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x82b/0x12c0 kernel/workqueue.c:2574 #2: ffff8881437e1190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] #2: ffff8881437e1190 (&dev->mutex){....}-{3:3}, at: hub_event+0x20e/0x52c0 drivers/usb/core/hub.c:5754 #3: ffff8881437e4508 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3162 [inline] #3: ffff8881437e4508 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5318 [inline] #3: ffff8881437e4508 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5566 [inline] #3: ffff8881437e4508 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5726 [inline] #3: ffff8881437e4508 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x253a/0x52c0 drivers/usb/core/hub.c:5808 #4: ffff8880227e1d68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5319 [inline] #4: ffff8880227e1d68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5566 [inline] #4: ffff8880227e1d68 (hcd->address0_mutex){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5726 [inline] #4: ffff8880227e1d68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_event+0x256e/0x52c0 drivers/usb/core/hub.c:5808 2 locks held by kworker/u4:9/2912: 2 locks held by syz-executor.0/16379: 2 locks held by syz-executor.2/16406: #0: ffff888017e7f9c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2b0/0x340 fs/file.c:1062 #1: ffff88802b4be410 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x216/0xaf0 fs/read_write.c:580 2 locks held by syz-executor.3/16408: 2 locks held by syz-executor.0/16410: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.5.0-rc6-syzkaller-00036-g4853c74bd7ab #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x187/0x300 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+0xec2/0xf00 kernel/hung_task.c:379 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2911 Comm: kworker/u4:7 Not tainted 6.5.0-rc6-syzkaller-00036-g4853c74bd7ab #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:782 [inline] RIP: 0010:batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline] RIP: 0010:batadv_nc_worker+0x238/0x5c0 net/batman-adv/network-coding.c:719 Code: 24 e8 ec 0f ff f6 c6 05 1e eb f6 03 01 48 c7 c7 e0 98 17 8c be 0b 03 00 00 48 c7 c2 80 99 17 8c e8 1d 24 df f6 e8 98 9a e8 f6 b3 7a 00 00 49 ff c4 48 8b 44 24 18 42 0f b6 04 28 84 c0 48 8b RSP: 0018:ffffc9000b717bb8 EFLAGS: 00000287 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff888081330000 RDX: 0000000000000000 RSI: ffffffff8b58ad40 RDI: ffffffff8b58ad00 RBP: 0000000000000001 R08: ffffffff8a8ca7f9 R09: 1ffffffff20f6860 R10: dffffc0000000000 R11: fffffbfff20f6861 R12: 0000000000000084 R13: dffffc0000000000 R14: ffff88803cc7cc80 R15: ffff88802bb170c0 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb710598000 CR3: 000000000d130000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: process_one_work+0x92c/0x12c0 kernel/workqueue.c:2600 worker_thread+0xa63/0x1210 kernel/workqueue.c:2751 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304