INFO: task kworker/0:6:5870 blocked for more than 143 seconds. Not tainted 5.15.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:6 state:D stack:22536 pid: 5870 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x947/0x22b0 kernel/sched/core.c:6287 schedule+0xcf/0x270 kernel/sched/core.c:6366 rwsem_down_write_slowpath+0x8e3/0x1190 kernel/locking/rwsem.c:1107 __down_write_common kernel/locking/rwsem.c:1262 [inline] __down_write_common kernel/locking/rwsem.c:1259 [inline] __down_write kernel/locking/rwsem.c:1271 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1518 usb_deregister_dev+0xaa/0x320 drivers/usb/core/file.c:239 sisusb_disconnect+0x5a/0x200 drivers/usb/misc/sisusbvga/sisusb.c:3166 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458 __device_release_driver+0x5d7/0x700 drivers/base/dd.c:1205 device_release_driver_internal drivers/base/dd.c:1236 [inline] device_release_driver+0x26/0x40 drivers/base/dd.c:1259 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:529 device_del+0x502/0xd60 drivers/base/core.c:3546 usb_disable_device+0x35b/0x7b0 drivers/usb/core/message.c:1419 usb_disconnect.cold+0x27a/0x78e drivers/usb/core/hub.c:2225 hub_port_connect drivers/usb/core/hub.c:5199 [inline] hub_port_connect_change drivers/usb/core/hub.c:5488 [inline] port_event drivers/usb/core/hub.c:5634 [inline] hub_event+0x1c9c/0x4330 drivers/usb/core/hub.c:5716 process_one_work+0x9bf/0x1620 kernel/workqueue.c:2297 process_scheduled_works kernel/workqueue.c:2360 [inline] worker_thread+0x85c/0x11f0 kernel/workqueue.c:2446 kthread+0x3c2/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Showing all locks held in the system: 1 lock held by khungtaskd/24: #0: ffffffff87681ea0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6446 6 locks held by kworker/1:2/1164: #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x8a3/0x1620 kernel/workqueue.c:2268 #1: ffffc90000207db0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8d7/0x1620 kernel/workqueue.c:2272 #2: ffff88810cf86220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #2: ffff88810cf86220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4330 drivers/usb/core/hub.c:5662 #3: ffff88814e17a220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #3: ffff88814e17a220 (&dev->mutex){....}-{3:3}, at: usb_disconnect.cold+0x43/0x78e drivers/usb/core/hub.c:2216 #4: ffff88811b38a1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #4: ffff88811b38a1a8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1032 [inline] #4: ffff88811b38a1a8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal drivers/base/dd.c:1233 [inline] #4: ffff88811b38a1a8 (&dev->mutex){....}-{3:3}, at: device_release_driver+0x1c/0x40 drivers/base/dd.c:1259 #5: ffffffff87f7ebd0 (minor_rwsem){++++}-{3:3}, at: usb_deregister_dev+0xaa/0x320 drivers/usb/core/file.c:239 2 locks held by in:imklog/2820: 2 locks held by agetty/2828: #0: ffff888115efd098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc90000fd32e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 6 locks held by kworker/1:3/5211: #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x8a3/0x1620 kernel/workqueue.c:2268 #1: ffffc90002147db0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8d7/0x1620 kernel/workqueue.c:2272 #2: ffff88810d056220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #2: ffff88810d056220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4330 drivers/usb/core/hub.c:5662 #3: ffff88810a553220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #3: ffff88810a553220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:944 #4: ffff8881498701a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #4: ffff8881498701a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:944 #5: ffffffff87f7ebd0 (minor_rwsem){++++}-{3:3}, at: usb_register_dev drivers/usb/core/file.c:187 [inline] #5: ffffffff87f7ebd0 (minor_rwsem){++++}-{3:3}, at: usb_register_dev+0x19d/0x7e0 drivers/usb/core/file.c:156 6 locks held by kworker/0:6/5870: #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff8881035bd538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x8a3/0x1620 kernel/workqueue.c:2268 #1: ffffc90003327db0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8d7/0x1620 kernel/workqueue.c:2272 #2: ffff88810ceee220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #2: ffff88810ceee220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4330 drivers/usb/core/hub.c:5662 #3: ffff88814e17d220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #3: ffff88814e17d220 (&dev->mutex){....}-{3:3}, at: usb_disconnect.cold+0x43/0x78e drivers/usb/core/hub.c:2216 #4: ffff8881167e31a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #4: ffff8881167e31a8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1032 [inline] #4: ffff8881167e31a8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal drivers/base/dd.c:1233 [inline] #4: ffff8881167e31a8 (&dev->mutex){....}-{3:3}, at: device_release_driver+0x1c/0x40 drivers/base/dd.c:1259 #5: ffffffff87f7ebd0 (minor_rwsem){++++}-{3:3}, at: usb_deregister_dev+0xaa/0x320 drivers/usb/core/file.c:239 2 locks held by agetty/22836: #0: ffff88814a1a6098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffff88814a1a6130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:961 [inline] #1: ffff88814a1a6130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:984 [inline] #1: ffff88814a1a6130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write.constprop.0+0x29f/0x910 drivers/tty/tty_io.c:1110 2 locks held by syz-executor.3/26874: #0: ffffffff87f7ebd0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x24/0x2e0 drivers/usb/core/file.c:39 #1: ffff8881439890d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb2/0x4d0 drivers/usb/misc/sisusbvga/sisusb.c:2396 1 lock held by syz-executor.4/27437: #0: ffffffff87f7ebd0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x24/0x2e0 drivers/usb/core/file.c:39 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x49/0x148 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1d5/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc0f/0xf20 kernel/hung_task.c:295 kthread+0x3c2/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 1162 Comm: systemd-journal Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x7fe668675c86 Code: 84 c0 4c 8b 4c 24 08 0f 84 87 02 00 00 49 8b 41 28 80 78 0c 00 0f 85 e5 03 00 00 41 0f b6 51 08 44 0f b6 34 24 89 d0 83 e2 fd e8 41 09 c6 41 83 e6 01 45 01 f6 41 09 d6 45 88 71 08 49 8b 47 RSP: 002b:00007ffea1135d40 EFLAGS: 00000246 RAX: 0000000000000002 RBX: 00000000001a4808 RCX: 00000000001a4808 RDX: 0000000000000000 RSI: 0000000000000015 RDI: 00005639930fe3a0 RBP: 00005639930f1040 R08: 00000000001a5e10 R09: 00005639930fe3a0 R10: 00007ffea11d9090 R11: 00007fe662b49d68 R12: 0000000000000006 R13: 0000000000000003 R14: 0000000000000000 R15: 00005639930f5440 FS: 00007fe668a3d8c0 GS: 0000000000000000