BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 8073, name: syz-executor914 3 locks held by syz-executor914/8073: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 954 hardirqs last enabled at (953): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (954): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (954): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (778): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (755): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (755): [] irq_exit+0x193/0x240 kernel/softirq.c:409 Preemption disabled at: [< (null)>] (null) CPU: 1 PID: 8073 Comm: syz-executor914 Not tainted 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffc6123e598 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000074db R13: 00007ffc6123e5ac R14: 00007ffc6123e5c0 R15: 00007ffc6123e5b0 BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 8235, name: syz-executor914 3 locks held by syz-executor914/8235: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 788 hardirqs last enabled at (787): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (788): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (788): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (714): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (345): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (345): [] irq_exit+0x193/0x240 kernel/softirq.c:409 Preemption disabled at: [< (null)>] (null) CPU: 1 PID: 8235 Comm: syz-executor914 Tainted: G W 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffc6123e598 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000007a59 R13: 00007ffc6123e5ac R14: 00007ffc6123e5c0 R15: 00007ffc6123e5b0 BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 8613, name: syz-executor914 3 locks held by syz-executor914/8613: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 410 hardirqs last enabled at (409): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (410): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (410): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (0): [] copy_process.part.0+0x12d0/0x71c0 kernel/fork.c:1733 softirqs last disabled at (0): [< (null)>] (null) Preemption disabled at: [< (null)>] (null) CPU: 1 PID: 8613 Comm: syz-executor914 Tainted: G W 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffc6123e598 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000008559 R13: 00007ffc6123e5ac R14: 00007ffc6123e5c0 R15: 00007ffc6123e5b0 BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 8741, name: syz-executor914 3 locks held by syz-executor914/8741: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 414 hardirqs last enabled at (413): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (414): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (414): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (0): [] copy_process.part.0+0x12d0/0x71c0 kernel/fork.c:1733 softirqs last disabled at (0): [< (null)>] (null) Preemption disabled at: [< (null)>] (null) CPU: 0 PID: 8741 Comm: syz-executor914 Tainted: G W 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffc6123e598 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000089dd R13: 00007ffc6123e5ac R14: 00007ffc6123e5c0 R15: 00007ffc6123e5b0 BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 8906, name: syz-executor914 3 locks held by syz-executor914/8906: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 592 hardirqs last enabled at (591): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (592): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (592): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (554): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (545): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (545): [] irq_exit+0x193/0x240 kernel/softirq.c:409 Preemption disabled at: [< (null)>] (null) CPU: 1 PID: 8906 Comm: syz-executor914 Tainted: G W 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffc6123e598 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000008f85 R13: 00007ffc6123e5ac R14: 00007ffc6123e5c0 R15: 00007ffc6123e5b0 BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 9121, name: syz-executor914 3 locks held by syz-executor914/9121: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 404 hardirqs last enabled at (403): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (404): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (404): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (0): [] copy_process.part.0+0x12d0/0x71c0 kernel/fork.c:1733 softirqs last disabled at (0): [< (null)>] (null) Preemption disabled at: [< (null)>] (null) CPU: 0 PID: 9121 Comm: syz-executor914 Tainted: G W 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x440009 RSP: 002b:00007ffc6123e598 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440009 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000005 RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000009669 R13: 00007ffc6123e5ac R14: 00007ffc6123e5c0 R15: 00007ffc6123e5b0 BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2228 in_atomic(): 1, irqs_disabled(): 1, pid: 9254, name: syz-executor914 3 locks held by syz-executor914/9254: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&(&tty->flow_lock)->rlock){....}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&tty->flow_lock)->rlock){....}, at: [] n_tty_ioctl_helper+0xa0/0x350 drivers/tty/tty_ioctl.c:913 #2: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref+0x1b/0x80 drivers/tty/tty_ldisc.c:305 irq event stamp: 468 hardirqs last enabled at (467): [] do_syscall_64+0x4c/0x640 arch/x86/entry/common.c:280 hardirqs last disabled at (468): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (468): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (210): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (185): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (185): [] irq_exit+0x193/0x240 kernel/softirq.c:409 Preemption disabled at: [< (null)>] (null) CPU: 1 PID: 9254 Comm: syz-executor914 Tainted: G W 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6038 do_con_write+0xd0/0x19b0 drivers/tty/vt/vt.c:2228 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805 n_hdlc_send_frames+0x241/0x410 drivers/tty/n_hdlc.c:404 n_hdlc_tty_wakeup+0x95/0xb0 drivers/tty/n_hdlc.c:480 tty_wakeup+0xc3/0xf0 drivers/tty/tty_io.c:533 __start_tty drivers/tty/tty_io.c:805 [inline] __start_tty+0x10b/0x140 drivers/tty/tty_io.c:798 n_tty_ioctl_helper+0x2f8/0x350 drivers/tty/tty_ioctl.c:916 n_hdlc_tty_ioctl+0xd4/0x300 drivers/tty/n_hdlc.c:784 tty_ioctl+0x5af/0x13c0 drivers/tty/tty_io.c:2670