[ 5735] 0 5735 639 10 6 3 0 -1000 blkid [ 5737] 0 5737 639 9 6 3 0 -1000 blkid [ 5738] 0 5738 5365 170 15 3 0 -1000 udevd Out of memory: Kill process 5703 (syz-executor1) score 1010 or sacrifice child Killed process 5703 (syz-executor1) total-vm:70472kB, anon-rss:18120kB, file-rss:52252kB, shmem-rss:0kB INFO: task syz-executor1:5714 blocked for more than 140 seconds. Not tainted 4.14.80+ #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D28088 5714 1849 0x80000006 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 tty_release+0xaf1/0xdc0 drivers/tty/tty_io.c:1766 __fput+0x25e/0x6f0 fs/file_table.c:210 task_work_run+0x116/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x8fb/0x28c0 kernel/exit.c:865 do_group_exit+0x100/0x2e0 kernel/exit.c:968 get_signal+0x4e5/0x1470 kernel/signal.c:2348 do_signal+0x8f/0x1660 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x116/0x150 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:267 [inline] do_syscall_64+0x35d/0x4b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457569 RSP: 002b:00007f029d597cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000072c048 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072c048 RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072c04c R13: 00007ffe715a0cff R14: 00007f029d5989c0 R15: 0000000000000002 INFO: task syz-executor2:5877 blocked for more than 140 seconds. Not tainted 4.14.80+ #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D27304 5877 1851 0x80000006 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 tty_release+0xaf1/0xdc0 drivers/tty/tty_io.c:1766 __fput+0x25e/0x6f0 fs/file_table.c:210 task_work_run+0x116/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x8fb/0x28c0 kernel/exit.c:865 do_group_exit+0x100/0x2e0 kernel/exit.c:968 get_signal+0x4e5/0x1470 kernel/signal.c:2348 do_signal+0x8f/0x1660 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x116/0x150 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:267 [inline] do_syscall_64+0x35d/0x4b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457569 RSP: 002b:00007feba8c81cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000072c048 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072c048 RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072c04c R13: 00007ffe9f962ecf R14: 00007feba8c829c0 R15: 0000000000000002 INFO: task syz-executor2:5923 blocked for more than 140 seconds. Not tainted 4.14.80+ #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D26408 5923 1851 0x80000006 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 tty_release+0xaf1/0xdc0 drivers/tty/tty_io.c:1766 __fput+0x25e/0x6f0 fs/file_table.c:210 task_work_run+0x116/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x8fb/0x28c0 kernel/exit.c:865 do_group_exit+0x100/0x2e0 kernel/exit.c:968 get_signal+0x4e5/0x1470 kernel/signal.c:2348 do_signal+0x8f/0x1660 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x116/0x150 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:267 [inline] do_syscall_64+0x35d/0x4b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457569 RSP: 002b:00007feba8c81cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000072c048 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072c048 RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072c04c R13: 00007ffe9f962ecf R14: 00007feba8c829c0 R15: 0000000000000002 INFO: task syz-executor2:5988 blocked for more than 140 seconds. Not tainted 4.14.80+ #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D26792 5988 1851 0x80000006 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 tty_release+0xaf1/0xdc0 drivers/tty/tty_io.c:1766 __fput+0x25e/0x6f0 fs/file_table.c:210 task_work_run+0x116/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x8fb/0x28c0 kernel/exit.c:865 do_group_exit+0x100/0x2e0 kernel/exit.c:968 get_signal+0x4e5/0x1470 kernel/signal.c:2348 do_signal+0x8f/0x1660 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x116/0x150 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:267 [inline] do_syscall_64+0x35d/0x4b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457569 RSP: 002b:00007feba8c81cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000072c048 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072c048 RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072c04c R13: 00007ffe9f962ecf R14: 00007feba8c829c0 R15: 0000000000000002 INFO: task init:32039 blocked for more than 140 seconds. Not tainted 4.14.80+ #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D28056 32039 1 0x00000000 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 chrdev_open+0x20d/0x570 fs/char_dev.c:417 do_dentry_open+0x426/0xda0 fs/open.c:764 vfs_open+0x11c/0x210 fs/open.c:878 do_last fs/namei.c:3408 [inline] path_openat+0x4eb/0x23a0 fs/namei.c:3550 do_filp_open+0x197/0x270 fs/namei.c:3584 do_sys_open+0x2ef/0x580 fs/open.c:1071 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7fe0343c0120 RSP: 002b:00007ffc1d10df58 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00000000010cd010 RCX: 00007fe0343c0120 RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8 RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902 R13: 0000000000000102 R14: 00007ffc1d10e0d0 R15: 00000000010cd018 INFO: task init:32040 blocked for more than 140 seconds. Not tainted 4.14.80+ #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D28744 32040 1 0x00000000 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 chrdev_open+0x20d/0x570 fs/char_dev.c:417 do_dentry_open+0x426/0xda0 fs/open.c:764 vfs_open+0x11c/0x210 fs/open.c:878 do_last fs/namei.c:3408 [inline] path_openat+0x4eb/0x23a0 fs/namei.c:3550 do_filp_open+0x197/0x270 fs/namei.c:3584 do_sys_open+0x2ef/0x580 fs/open.c:1071 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7fe0343c0120 RSP: 002b:00007ffc1d10df58 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00000000010cd0e0 RCX: 00007fe0343c0120 RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8 RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902 R13: 0000000000000102 R14: 00007ffc1d10e0d0 R15: 00000000010cd0e8 INFO: task init:32042 blocked for more than 140 seconds. Not tainted 4.14.80+ #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D28520 32042 1 0x00000000 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 chrdev_open+0x20d/0x570 fs/char_dev.c:417 do_dentry_open+0x426/0xda0 fs/open.c:764 vfs_open+0x11c/0x210 fs/open.c:878 do_last fs/namei.c:3408 [inline] path_openat+0x4eb/0x23a0 fs/namei.c:3550 do_filp_open+0x197/0x270 fs/namei.c:3584 do_sys_open+0x2ef/0x580 fs/open.c:1071 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7fe0343c0120 RSP: 002b:00007ffc1d10df58 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00000000010cd280 RCX: 00007fe0343c0120 RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8 RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902 R13: 0000000000000102 R14: 00007ffc1d10e0d0 R15: 00000000010cd288 INFO: task init:32043 blocked for more than 140 seconds. Not tainted 4.14.80+ #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D29352 32043 1 0x00000000 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 chrdev_open+0x20d/0x570 fs/char_dev.c:417 do_dentry_open+0x426/0xda0 fs/open.c:764 vfs_open+0x11c/0x210 fs/open.c:878 do_last fs/namei.c:3408 [inline] path_openat+0x4eb/0x23a0 fs/namei.c:3550 do_filp_open+0x197/0x270 fs/namei.c:3584 do_sys_open+0x2ef/0x580 fs/open.c:1071 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7fe0343c0120 RSP: 002b:00007ffc1d10df58 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00000000010cd350 RCX: 00007fe0343c0120 RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8 RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902 R13: 0000000000000102 R14: 00007ffc1d10e0d0 R15: 00000000010cd358 INFO: task init:32044 blocked for more than 140 seconds. Not tainted 4.14.80+ #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D28520 32044 1 0x00000000 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 chrdev_open+0x20d/0x570 fs/char_dev.c:417 do_dentry_open+0x426/0xda0 fs/open.c:764 vfs_open+0x11c/0x210 fs/open.c:878 do_last fs/namei.c:3408 [inline] path_openat+0x4eb/0x23a0 fs/namei.c:3550 do_filp_open+0x197/0x270 fs/namei.c:3584 do_sys_open+0x2ef/0x580 fs/open.c:1071 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7fe0343c0120 RSP: 002b:00007ffc1d10df58 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00000000010ccf40 RCX: 00007fe0343c0120 RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8 RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902 R13: 0000000000000102 R14: 00007ffc1d10e0d0 R15: 00000000010ccf48 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541 1 lock held by rsyslogd/1633: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0xa2/0xc0 fs/file.c:768 2 locks held by getty/1761: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142 1 lock held by syz-executor1/5714: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/5877: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/5923: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/5988: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6035: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6086: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6135: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6181: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6224: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6267: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6423: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6468: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6515: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6558: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor5/6564: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6613: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6709: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6730: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6774: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6824: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6869: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor0/6873: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/6900: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor5/6902: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor5/6981: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor0/6982: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor5/7008: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor0/7071: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor5/7146: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/7151: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor1/7153: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor5/7172: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor1/7174: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor5/7195: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor1/7215: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor5/7217: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor5/7245: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor1/7257: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor5/7265: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor1/7304: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor1/7330: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor1/7370: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor1/7432: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by syz-executor2/7443: #0: (tty_mutex){+.+.}, at: [] tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1605 1 lock held by init/32039: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 1 lock held by init/32040: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 1 lock held by init/32042: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 1 lock held by init/32043: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 1 lock held by init/32044: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.80+ #5 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x574/0xa70 kernel/hung_task.c:252 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 32041 Comm: init Not tainted 4.14.80+ #5 task: ffff88019f4d5e00 task.stack: ffff880173fe8000 RIP: 0010:rep_nop arch/x86/include/asm/processor.h:655 [inline] RIP: 0010:delay_tsc+0x2e/0xb0 arch/x86/lib/delay.c:67 RSP: 0018:ffff880173fef620 EFLAGS: 00000082 RAX: 0000000080000001 RBX: 0000064f9a3f69cf RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffffffffab5515c0 RDI: ffffffffacfd23e0 RBP: 0000064f9a3f68bd R08: 000000000000594c R09: ffffffffacaf3140 R10: ffff88019f4d6680 R11: 0000000000000001 R12: 00000000000008fd R13: 0000000000000001 R14: fffffbfff5b24365 R15: ffffffffad921d12 FS: 00007fe034cf07a0(0000) GS:ffff8801dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f02130c8ca0 CR3: 000000012dfe2001 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: wait_for_xmitr+0x66/0x1e0 drivers/tty/serial/8250/8250_port.c:2040 serial8250_console_putchar+0x19/0x50 drivers/tty/serial/8250/8250_port.c:3184 uart_console_write+0x4b/0xd0 drivers/tty/serial/serial_core.c:1883 serial8250_console_write+0x51b/0x800 drivers/tty/serial/8250/8250_port.c:3250 call_console_drivers kernel/printk/printk.c:1574 [inline] console_unlock+0x5b9/0xb50 kernel/printk/printk.c:2242 console_device+0x92/0xb0 kernel/printk/printk.c:2351 tty_lookup_driver+0x17a/0x210 drivers/tty/tty_io.c:1833 tty_open_by_driver drivers/tty/tty_io.c:1928 [inline] tty_open+0x3b9/0x980 drivers/tty/tty_io.c:2011 chrdev_open+0x20d/0x570 fs/char_dev.c:417 do_dentry_open+0x426/0xda0 fs/open.c:764 vfs_open+0x11c/0x210 fs/open.c:878 do_last fs/namei.c:3408 [inline] path_openat+0x4eb/0x23a0 fs/namei.c:3550 do_filp_open+0x197/0x270 fs/namei.c:3584 do_sys_open+0x2ef/0x580 fs/open.c:1071 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7fe0343c0120 RSP: 002b:00007ffc1d10df58 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00000000010cd1b0 RCX: 00007fe0343c0120 RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8 RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902 R13: 0000000000000102 R14: 00007ffc1d10e0d0 R15: 00000000010cd1b8 Code: 54 49 89 fc bf 01 00 00 00 55 53 e8 2d 60 91 fe e8 28 2e 34 ff 41 89 c5 0f ae e8 0f 31 48 c1 e2 20 48 09 c2 48 89 d5 eb 16 f3 90 01 00 00 00 e8 08 60 91 fe e8 03 2e 34 ff 44 39 e8 75 36 0f