BUG: sleeping function called from invalid context at kernel/printk/printk.c:2634 in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 5165, name: syz-executor240 preempt_count: 1, expected: 0 RCU nest depth: 0, expected: 0 3 locks held by syz-executor240/5165: #0: ffff8880212660a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffff888021266130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:954 [inline] #1: ffff888021266130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: iterate_tty_write drivers/tty/tty_io.c:973 [inline] #1: ffff888021266130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write.constprop.0+0x293/0x9b0 drivers/tty/tty_io.c:1096 #2: ffff88802b8303e0 (&gsm->tx_lock){....}-{2:2}, at: gsmld_write+0x62/0x150 drivers/tty/n_gsm.c:3721 irq event stamp: 15630 hardirqs last enabled at (15629): [] syscall_enter_from_user_mode include/linux/entry-common.h:197 [inline] hardirqs last enabled at (15629): [] do_syscall_64+0x91/0x260 arch/x86/entry/common.c:79 hardirqs last disabled at (15630): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (15630): [] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162 softirqs last enabled at (13938): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (13938): [] fpregs_unlock arch/x86/include/asm/fpu/api.h:80 [inline] softirqs last enabled at (13938): [] fpu_reset_fpregs arch/x86/kernel/fpu/core.c:733 [inline] softirqs last enabled at (13938): [] fpu_flush_thread+0x306/0x400 arch/x86/kernel/fpu/core.c:777 softirqs last disabled at (13936): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (13936): [] fpregs_lock arch/x86/include/asm/fpu/api.h:72 [inline] softirqs last disabled at (13936): [] fpu_reset_fpregs arch/x86/kernel/fpu/core.c:716 [inline] softirqs last disabled at (13936): [] fpu_flush_thread+0x239/0x400 arch/x86/kernel/fpu/core.c:777 Preemption disabled at: [<0000000000000000>] 0x0 CPU: 3 PID: 5165 Comm: syz-executor240 Not tainted 6.8.0-syzkaller-01185-g855684c7d938 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 __might_resched+0x3c0/0x5e0 kernel/sched/core.c:10187 console_lock+0x34/0x150 kernel/printk/printk.c:2634 do_con_write+0x149/0x7f50 drivers/tty/vt/vt.c:2862 con_write+0x23/0xc0 drivers/tty/vt/vt.c:3251 gsmld_write+0xd2/0x150 drivers/tty/n_gsm.c:3724 iterate_tty_write drivers/tty/tty_io.c:1021 [inline] file_tty_write.constprop.0+0x518/0x9b0 drivers/tty/tty_io.c:1096 call_write_iter include/linux/fs.h:2108 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6db/0x1100 fs/read_write.c:590 ksys_write+0x12f/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f845fd7c569 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeb3b3dcf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffeb3b3dec8 RCX: 00007f845fd7c569 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f845fdef610 R08: 00007ffeb3b3dec8 R09: 00007ffeb3b3dec8 R10: 00007ffeb3b3d9f6 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffeb3b3deb8 R14: 0000000000000001 R15: 0000000000000001