BUG: sleeping function called from invalid context at kernel/printk/printk.c:2555 in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 4907, name: syz-executor 3 locks held by syz-executor/4907: #0: ffff0000d6709098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff0000d6709130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:961 [inline] #1: ffff0000d6709130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:984 [inline] #1: ffff0000d6709130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write+0x1cc/0x72c drivers/tty/tty_io.c:1110 #2: ffff0000ce90a398 (&gsm->tx_lock){....}-{2:2}, at: gsmld_write+0x5c/0x160 drivers/tty/n_gsm.c:2983 irq event stamp: 10112 hardirqs last enabled at (10111): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (10111): [] _raw_spin_unlock_irqrestore+0xa8/0x14c kernel/locking/spinlock.c:194 hardirqs last disabled at (10112): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (10112): [] _raw_spin_lock_irqsave+0xfc/0x14c kernel/locking/spinlock.c:162 softirqs last enabled at (10104): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31 softirqs last disabled at (10102): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18 Preemption disabled at: [] gsmld_write+0x5c/0x160 drivers/tty/n_gsm.c:2983 CPU: 1 PID: 4907 Comm: syz-executor Not tainted 5.15.184-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 ___might_sleep+0x358/0x4d4 kernel/sched/core.c:9639 __might_sleep+0x98/0x124 kernel/sched/core.c:9593 console_lock+0x30/0x16c kernel/printk/printk.c:2555 do_con_write+0xf4/0x5714 drivers/tty/vt/vt.c:2908 con_write+0x34/0x58 drivers/tty/vt/vt.c:3295 gsmld_write+0x104/0x160 drivers/tty/n_gsm.c:2986 do_tty_write drivers/tty/tty_io.c:1038 [inline] file_tty_write+0x420/0x72c drivers/tty/tty_io.c:1110 tty_write+0x44/0x54 drivers/tty/tty_io.c:1131 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7c8/0xa2c fs/read_write.c:594 ksys_write+0x120/0x210 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584