NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task syz-executor.5:13851 blocked for more than 140 seconds. Not tainted 4.19.128-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28592 13851 6914 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x8f3/0xed0 kernel/time/timer.c:1782 __down_common kernel/locking/semaphore.c:221 [inline] __down+0x192/0x2b0 kernel/locking/semaphore.c:238 down+0x57/0x80 kernel/locking/semaphore.c:62 console_lock+0x25/0x80 kernel/printk/printk.c:2244 con_install+0x8b/0x5f0 drivers/tty/vt/vt.c:3231 tty_driver_install_tty drivers/tty/tty_io.c:1226 [inline] tty_init_dev drivers/tty/tty_io.c:1339 [inline] tty_init_dev+0xee/0x450 drivers/tty/tty_io.c:1316 tty_open_by_driver drivers/tty/tty_io.c:1981 [inline] tty_open+0x6a4/0x950 drivers/tty/tty_io.c:2029 chrdev_open+0x219/0x5c0 fs/char_dev.c:423 do_dentry_open+0x4a8/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0xe06/0x2eb0 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3aa/0x510 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416861 Code: 00 00 00 e8 61 10 05 00 48 89 d8 b9 28 00 00 00 e8 54 10 05 00 48 89 d8 b9 28 00 00 00 e8 47 10 05 00 48 89 d8 b9 28 00 00 00 3a 10 05 00 48 89 f0 b9 28 00 00 00 e8 2d 10 05 00 48 89 f0 b9 RSP: 002b:00007f80a27237a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000509d80 RCX: 0000000000416861 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f80a27237d0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c32 R14: 00000000004ce8ab R15: 00007f80a27246d4 INFO: task syz-executor.5:13862 blocked for more than 140 seconds. Not tainted 4.19.128-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29296 13862 6914 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x5b8/0x1300 kernel/locking/mutex.c:1072 tty_open_by_driver drivers/tty/tty_io.c:1945 [inline] tty_open+0x391/0x950 drivers/tty/tty_io.c:2029 chrdev_open+0x219/0x5c0 fs/char_dev.c:423 do_dentry_open+0x4a8/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0xe06/0x2eb0 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3aa/0x510 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416861 Code: 00 00 00 e8 61 10 05 00 48 89 d8 b9 28 00 00 00 e8 54 10 05 00 48 89 d8 b9 28 00 00 00 e8 47 10 05 00 48 89 d8 b9 28 00 00 00 3a 10 05 00 48 89 f0 b9 28 00 00 00 e8 2d 10 05 00 48 89 f0 b9 RSP: 002b:00007f80a27027a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000509d80 RCX: 0000000000416861 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f80a27027d0 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c32 R14: 00000000004ce8ab R15: 00007f80a27036d4 INFO: task syz-executor.5:13864 blocked for more than 140 seconds. Not tainted 4.19.128-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D26928 13864 6914 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x5b8/0x1300 kernel/locking/mutex.c:1072 tty_open_by_driver drivers/tty/tty_io.c:1945 [inline] tty_open+0x391/0x950 drivers/tty/tty_io.c:2029 chrdev_open+0x219/0x5c0 fs/char_dev.c:423 do_dentry_open+0x4a8/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0xe06/0x2eb0 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3aa/0x510 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416861 Code: 00 00 00 e8 61 10 05 00 48 89 d8 b9 28 00 00 00 e8 54 10 05 00 48 89 d8 b9 28 00 00 00 e8 47 10 05 00 48 89 d8 b9 28 00 00 00 3a 10 05 00 48 89 f0 b9 28 00 00 00 e8 2d 10 05 00 48 89 f0 b9 RSP: 002b:00007f80a26e17a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000509d80 RCX: 0000000000416861 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f80a26e17d0 RBP: 000000000078c040 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c32 R14: 00000000004ce8ab R15: 00007f80a26e26d4 INFO: task syz-executor.5:13885 blocked for more than 140 seconds. Not tainted 4.19.128-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29296 13885 6914 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x5b8/0x1300 kernel/locking/mutex.c:1072 tty_open_by_driver drivers/tty/tty_io.c:1945 [inline] tty_open+0x391/0x950 drivers/tty/tty_io.c:2029 chrdev_open+0x219/0x5c0 fs/char_dev.c:423 do_dentry_open+0x4a8/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0xe06/0x2eb0 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3aa/0x510 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416861 Code: 00 00 00 e8 61 10 05 00 48 89 d8 b9 28 00 00 00 e8 54 10 05 00 48 89 d8 b9 28 00 00 00 e8 47 10 05 00 48 89 d8 b9 28 00 00 00 3a 10 05 00 48 89 f0 b9 28 00 00 00 e8 2d 10 05 00 48 89 f0 b9 RSP: 002b:00007f80a26c07a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000509d80 RCX: 0000000000416861 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f80a26c07d0 RBP: 000000000078c0e0 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c32 R14: 00000000004ce8ab R15: 00007f80a26c16d4 INFO: task syz-executor.4:13883 blocked for more than 140 seconds. Not tainted 4.19.128-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29456 13883 6827 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x5b8/0x1300 kernel/locking/mutex.c:1072 fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1457 chrdev_open+0x219/0x5c0 fs/char_dev.c:423 do_dentry_open+0x4a8/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0xe06/0x2eb0 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3aa/0x510 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 48 c7 44 24 10 00 00 00 00 48 8b 44 24 68 48 89 44 24 18 48 8b 44 24 70 48 89 44 24 20 48 8b 44 24 78 48 89 44 24 28 48 89 4c <24> 30 0f 57 c0 0f 11 44 24 38 48 c7 44 24 48 00 00 00 00 e8 0f d4 RSP: 002b:00007f84c6cd9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004f7ec0 RCX: 000000000045ca69 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000007b7 R14: 00000000004ca96d R15: 00007f84c6cda6d4 INFO: task syz-executor.0:13855 blocked for more than 140 seconds. Not tainted 4.19.128-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29456 13855 8425 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x5b8/0x1300 kernel/locking/mutex.c:1072 fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1457 chrdev_open+0x219/0x5c0 fs/char_dev.c:423 do_dentry_open+0x4a8/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0xe06/0x2eb0 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3aa/0x510 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 48 c7 44 24 10 00 00 00 00 48 8b 44 24 68 48 89 44 24 18 48 8b 44 24 70 48 89 44 24 20 48 8b 44 24 78 48 89 44 24 28 48 89 4c <24> 30 0f 57 c0 0f 11 44 24 38 48 c7 44 24 48 00 00 00 00 e8 0f d4 RSP: 002b:00007f3a761f9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004f7ec0 RCX: 000000000045ca69 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000007b7 R14: 00000000004ca96d R15: 00007f3a761fa6d4 INFO: task syz-executor.0:13860 blocked for more than 140 seconds. Not tainted 4.19.128-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29456 13860 8425 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x5b8/0x1300 kernel/locking/mutex.c:1072 fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1457 chrdev_open+0x219/0x5c0 fs/char_dev.c:423 do_dentry_open+0x4a8/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0xe06/0x2eb0 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3aa/0x510 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 48 c7 44 24 10 00 00 00 00 48 8b 44 24 68 48 89 44 24 18 48 8b 44 24 70 48 89 44 24 20 48 8b 44 24 78 48 89 44 24 28 48 89 4c <24> 30 0f 57 c0 0f 11 44 24 38 48 c7 44 24 48 00 00 00 00 e8 0f d4 RSP: 002b:00007f3a761d8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004f7ec0 RCX: 000000000045ca69 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000007b7 R14: 00000000004ca96d R15: 00007f3a761d96d4 INFO: task syz-executor.1:13858 blocked for more than 140 seconds. Not tainted 4.19.128-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29104 13858 6558 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x5b8/0x1300 kernel/locking/mutex.c:1072 tty_open_by_driver drivers/tty/tty_io.c:1945 [inline] tty_open+0x391/0x950 drivers/tty/tty_io.c:2029 chrdev_open+0x219/0x5c0 fs/char_dev.c:423 do_dentry_open+0x4a8/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0xe06/0x2eb0 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3aa/0x510 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416861 Code: 00 00 00 e8 61 10 05 00 48 89 d8 b9 28 00 00 00 e8 54 10 05 00 48 89 d8 b9 28 00 00 00 e8 47 10 05 00 48 89 d8 b9 28 00 00 00 3a 10 05 00 48 89 f0 b9 28 00 00 00 e8 2d 10 05 00 48 89 f0 b9 RSP: 002b:00007fcd1f93e7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000509d80 RCX: 0000000000416861 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007fcd1f93e7d0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c32 R14: 00000000004ce8ab R15: 00007fcd1f93f6d4 INFO: task syz-executor.1:13863 blocked for more than 140 seconds. Not tainted 4.19.128-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29296 13863 6558 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x5b8/0x1300 kernel/locking/mutex.c:1072 tty_open_by_driver drivers/tty/tty_io.c:1945 [inline] tty_open+0x391/0x950 drivers/tty/tty_io.c:2029 chrdev_open+0x219/0x5c0 fs/char_dev.c:423 do_dentry_open+0x4a8/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0xe06/0x2eb0 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3aa/0x510 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416861 Code: 00 00 00 e8 61 10 05 00 48 89 d8 b9 28 00 00 00 e8 54 10 05 00 48 89 d8 b9 28 00 00 00 e8 47 10 05 00 48 89 d8 b9 28 00 00 00 3a 10 05 00 48 89 f0 b9 28 00 00 00 e8 2d 10 05 00 48 89 f0 b9 RSP: 002b:00007fcd1f91d7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000509d80 RCX: 0000000000416861 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007fcd1f91d7d0 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c32 R14: 00000000004ce8ab R15: 00007fcd1f91e6d4 Showing all locks held in the system: 1 lock held by khungtaskd/1072: #0: 00000000279141d5 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/6104: #0: 000000004731a565 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:767 1 lock held by syz-executor.4/8920: #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_release_struct+0x2c/0x50 drivers/tty/tty_io.c:1623 2 locks held by syz-executor.5/13851: #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_open_by_driver drivers/tty/tty_io.c:1945 [inline] #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_open+0x391/0x950 drivers/tty/tty_io.c:2029 #1: 000000004002b83a (&tty->legacy_mutex){+.+.}, at: tty_lock+0x6a/0xa0 drivers/tty/tty_mutex.c:19 1 lock held by syz-executor.5/13862: #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_open_by_driver drivers/tty/tty_io.c:1945 [inline] #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_open+0x391/0x950 drivers/tty/tty_io.c:2029 1 lock held by syz-executor.5/13864: #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_open_by_driver drivers/tty/tty_io.c:1945 [inline] #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_open+0x391/0x950 drivers/tty/tty_io.c:2029 1 lock held by syz-executor.5/13885: #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_open_by_driver drivers/tty/tty_io.c:1945 [inline] #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_open+0x391/0x950 drivers/tty/tty_io.c:2029 3 locks held by syz-executor.4/13852: 1 lock held by syz-executor.4/13883: #0: 00000000fef84631 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1457 1 lock held by syz-executor.0/13855: #0: 00000000fef84631 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1457 1 lock held by syz-executor.0/13860: #0: 00000000fef84631 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1457 1 lock held by syz-executor.1/13858: #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_open_by_driver drivers/tty/tty_io.c:1945 [inline] #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_open+0x391/0x950 drivers/tty/tty_io.c:2029 1 lock held by syz-executor.1/13863: #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_open_by_driver drivers/tty/tty_io.c:1945 [inline] #0: 00000000930dc7e4 (tty_mutex){+.+.}, at: tty_open+0x391/0x950 drivers/tty/tty_io.c:2029 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1072 Comm: khungtaskd Not tainted 4.19.128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x962/0xe40 kernel/hung_task.c:287 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 13852 Comm: syz-executor.4 Not tainted 4.19.128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:bitfill_aligned drivers/video/fbdev/core/cfbfillrect.c:62 [inline] RIP: 0010:bitfill_aligned+0xdf/0x200 drivers/video/fbdev/core/cfbfillrect.c:35 Code: fd e8 a5 7d f0 fd 31 ff 44 89 fe e8 0b 7f f0 fd 45 85 ff 0f 85 f9 00 00 00 e8 8d 7d f0 fd 44 89 e0 31 d2 bf 07 00 00 00 f7 f5 <41> 89 c4 89 c6 89 c5 e8 e5 7e f0 fd 41 83 fc 07 76 62 45 89 e7 4c RSP: 0018:ffff88805488f200 EFLAGS: 00000246 RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffc9000e2e8000 RDX: 0000000000000000 RSI: ffffffff83771d33 RDI: 0000000000000007 RBP: 0000000000000040 R08: ffff888087f08580 R09: 0000000000000040 R10: ffffed1014ab2f3b R11: ffff8880a55979df R12: 0000000000000080 R13: ffff8880000a0000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f84c6cfb700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c00eacaa30 CR3: 00000000941f9000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cfb_fillrect+0x418/0x7a0 drivers/video/fbdev/core/cfbfillrect.c:327 vga16fb_fillrect+0x68f/0x1960 drivers/video/fbdev/vga16fb.c:951 bit_clear_margins+0x2d5/0x4a0 drivers/video/fbdev/core/bitblit.c:232 fbcon_clear_margins+0x2c7/0x350 drivers/video/fbdev/core/fbcon.c:1342 fbcon_switch+0xd9f/0x18f0 drivers/video/fbdev/core/fbcon.c:2324 redraw_screen+0x37d/0x870 drivers/tty/vt/vt.c:1015 fbcon_modechanged+0x5a0/0x870 drivers/video/fbdev/core/fbcon.c:2972 fbcon_event_notify+0x1b2/0x1d60 drivers/video/fbdev/core/fbcon.c:3347 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93 __blocking_notifier_call_chain kernel/notifier.c:317 [inline] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] blocking_notifier_call_chain kernel/notifier.c:328 [inline] blocking_notifier_call_chain+0x85/0xa0 kernel/notifier.c:325 fb_set_var+0xc39/0xe00 drivers/video/fbdev/core/fbmem.c:1042 do_fb_ioctl+0x450/0x9c0 drivers/video/fbdev/core/fbmem.c:1115 fb_ioctl+0xda/0x120 drivers/video/fbdev/core/fbmem.c:1230 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f84c6cfac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e4ec0 RCX: 000000000045ca69 RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000002f7 R14: 00000000004c5771 R15: 00007f84c6cfb6d4