INFO: task syz.1.1767:12358 blocked for more than 143 seconds. Not tainted 6.11.0-rc6-syzkaller-g9c0c11bb87b0 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.1767 state:D stack:27232 pid:12358 tgid:12358 ppid:5654 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xcda/0x2f80 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6621 rpm_resume+0x5a8/0x1330 drivers/base/power/runtime.c:834 rpm_resume+0x750/0x1330 drivers/base/power/runtime.c:892 __pm_runtime_resume+0xb6/0x170 drivers/base/power/runtime.c:1172 pm_runtime_resume_and_get include/linux/pm_runtime.h:430 [inline] usb_autopm_get_interface+0x20/0xe0 drivers/usb/core/driver.c:1833 wdm_manage_power+0x1d/0xa0 drivers/usb/class/cdc-wdm.c:1134 wdm_release+0x270/0x440 drivers/usb/class/cdc-wdm.c:779 __fput+0x408/0xbb0 fs/file_table.c:422 task_work_run+0x14e/0x250 kernel/task_work.c:228 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x24e/0x260 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efd6c74cef9 RSP: 002b:00007ffe837dbe88 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00000000000cb2ff RCX: 00007efd6c74cef9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007efd6c907a80 R08: 0000000000000001 R09: 00007ffe837dc17f R10: 00007efd6c5d0000 R11: 0000000000000246 R12: 00000000000cc425 R13: 00007ffe837dbf90 R14: 0000000000000bea R15: ffffffffffffffff INFO: task syz.3.1769:12375 blocked for more than 143 seconds. Not tainted 6.11.0-rc6-syzkaller-g9c0c11bb87b0 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.1769 state:D stack:28048 pid:12375 tgid:12373 ppid:5660 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xcda/0x2f80 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6621 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 usb_open+0x213/0x2f0 drivers/usb/core/file.c:47 chrdev_open+0x26d/0x6f0 fs/char_dev.c:414 do_dentry_open+0x957/0x1490 fs/open.c:959 vfs_open+0x82/0x3f0 fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x2141/0x2d20 fs/namei.c:3886 do_filp_open+0x1dc/0x430 fs/namei.c:3913 do_sys_openat2+0x17a/0x1e0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1442 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6d5836b890 RSP: 002b:00007f6d56fe6b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f6d5836b890 RDX: 0000000000000002 RSI: 00007f6d56fe6c10 RDI: 00000000ffffff9c RBP: 00007f6d56fe6c10 R08: 0000000000000000 R09: 00007f6d56fe6987 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6d58525f80 R15: 00007fffb22ab358 INFO: task syz.4.1783:12435 blocked for more than 144 seconds. Not tainted 6.11.0-rc6-syzkaller-g9c0c11bb87b0 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.1783 state:D stack:28368 pid:12435 tgid:12434 ppid:5656 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xcda/0x2f80 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6621 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 usb_open+0x213/0x2f0 drivers/usb/core/file.c:47 chrdev_open+0x26d/0x6f0 fs/char_dev.c:414 do_dentry_open+0x957/0x1490 fs/open.c:959 vfs_open+0x82/0x3f0 fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x2141/0x2d20 fs/namei.c:3886 do_filp_open+0x1dc/0x430 fs/namei.c:3913 do_sys_openat2+0x17a/0x1e0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1442 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f27d95ab890 RSP: 002b:00007f27d8226b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f27d95ab890 RDX: 0000000000000002 RSI: 00007f27d8226c10 RDI: 00000000ffffff9c RBP: 00007f27d8226c10 R08: 0000000000000000 R09: 00007f27d8226987 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f27d9765f80 R15: 00007ffc23843928 INFO: task syz.2.1782:12437 blocked for more than 144 seconds. Not tainted 6.11.0-rc6-syzkaller-g9c0c11bb87b0 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.1782 state:D stack:28912 pid:12437 tgid:12436 ppid:2664 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xcda/0x2f80 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6621 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 usb_open+0x213/0x2f0 drivers/usb/core/file.c:47 chrdev_open+0x26d/0x6f0 fs/char_dev.c:414 do_dentry_open+0x957/0x1490 fs/open.c:959 vfs_open+0x82/0x3f0 fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x2141/0x2d20 fs/namei.c:3886 do_filp_open+0x1dc/0x430 fs/namei.c:3913 do_sys_openat2+0x17a/0x1e0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1442 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f666a14b890 RSP: 002b:00007f6668dc6b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f666a14b890 RDX: 0000000000000002 RSI: 00007f6668dc6c10 RDI: 00000000ffffff9c RBP: 00007f6668dc6c10 R08: 0000000000000000 R09: 00007f6668dc6987 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f666a305f80 R15: 00007fff5b926978 Showing all locks held in the system: 3 locks held by kworker/0:0/8: #0: ffff888100eed548 ((wq_completion)pm){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206 #1: ffffc9000008fd80 ((work_completion)(&dev->power.work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207 #2: ffff88810974d510 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3206 [inline] #2: ffff88810974d510 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_port_suspend+0x255/0xf10 drivers/usb/core/hub.c:3463 1 lock held by khungtaskd/30: #0: ffffffff88ebb660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #0: ffffffff88ebb660 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff88ebb660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6626 2 locks held by getty/2610: #0: ffff88810f33f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000432f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2211 4 locks held by kworker/u8:1/10817: #0: ffff888100abb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206 #1: ffffc90001b1fd80 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207 #2: ffffffff8a161a10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xbb/0xbb0 net/core/net_namespace.c:594 #3: ffffffff88ec6cc0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x6c0 kernel/rcu/tree.c:4486 1 lock held by syz.1.1767/12358: #0: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_release+0x51/0x440 drivers/usb/class/cdc-wdm.c:764 2 locks held by syz.3.1769/12375: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.4.1783/12435: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.2.1782/12437: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.0.1795/13181: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.0.1795/13266: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.0.1795/13268: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.3.1802/14067: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.1.1803/14101: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.1.1803/14135: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.2.1805/14565: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.4.1811/14705: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.0.1815/15159: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.0.1815/15166: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.3.1819/16395: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.1.1824/16582: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.1.1824/16588: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.4.1816/17030: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.2.1835/17289: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.0.1845/17551: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.1.1831/18710: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.3.1856/18798: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.4.1858/19222: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.2.1862/19684: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.0.1847/19733: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz.0.1847/19743: #0: ffffffff899affb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x27/0x2f0 drivers/usb/core/file.c:38 #1: ffffffff89a6b188 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x640 drivers/usb/class/cdc-wdm.c:715 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc6-syzkaller-g9c0c11bb87b0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xf0c/0x1240 kernel/hung_task.c:379 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 4930 Comm: kworker/1:4 Not tainted 6.11.0-rc6-syzkaller-g9c0c11bb87b0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: events dvb_usb_read_remote_control RIP: 0010:io_serial_in+0x87/0xb0 drivers/tty/serial/8250/8250_port.c:407 Code: b7 b8 fe 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1a 66 03 5d 40 89 da ec <5b> 0f b6 c0 5d 41 5c c3 cc cc cc cc e8 98 ee 0e ff eb a2 e8 21 ef RSP: 0018:ffffc900024ef880 EFLAGS: 00000006 RAX: dffffc0000000005 RBX: 00000000000003f9 RCX: 0000000000000000 RDX: 00000000000003f9 RSI: ffffffff829bdc60 RDI: ffffffff935cfb80 RBP: ffffffff935cfb40 R08: 0000000000000001 R09: 000000000000001f R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff935cfb40 R14: ffffffff935cfb90 R15: 0000000000000039 FS: 0000000000000000(0000) GS:ffff8881f5900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f28be8e4440 CR3: 000000011585a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: serial_port_in include/linux/serial_core.h:674 [inline] serial8250_console_write+0x17d/0x1090 drivers/tty/serial/8250/8250_port.c:3357 console_emit_next_record kernel/printk/printk.c:2983 [inline] console_flush_all+0x53c/0xd70 kernel/printk/printk.c:3049 console_unlock+0xae/0x290 kernel/printk/printk.c:3118 vprintk_emit+0x409/0x600 kernel/printk/printk.c:2348 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45 _printk+0xc8/0x100 kernel/printk/printk.c:2373 dvb_usb_read_remote_control+0x174/0x1c0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:263 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244