BUG: sleeping function called from invalid context at kernel/printk/printk.c:2598 in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 6425, name: syz-executor.3 preempt_count: 1, expected: 0 RCU nest depth: 0, expected: 0 3 locks held by syz-executor.3/6425: #0: ffff0000d9caf098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff0000d9caf130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:944 [inline] #1: ffff0000d9caf130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:967 [inline] #1: ffff0000d9caf130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write+0x18c/0x6f0 drivers/tty/tty_io.c:1089 #2: ffff0000d9ea73e0 (&gsm->tx_lock){....}-{2:2}, at: gsmld_write+0x60/0x154 drivers/tty/n_gsm.c:3669 irq event stamp: 146 hardirqs last enabled at (145): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline] hardirqs last enabled at (145): [] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:94 hardirqs last disabled at (146): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (146): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs last enabled at (118): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (116): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 Preemption disabled at: [] gsmld_write+0x60/0x154 drivers/tty/n_gsm.c:3669 CPU: 0 PID: 6425 Comm: syz-executor.3 Not tainted 6.4.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 __might_resched+0x374/0x4d0 kernel/sched/core.c:10153 __might_sleep+0x90/0xe4 kernel/sched/core.c:10082 console_lock+0x28/0xa0 kernel/printk/printk.c:2598 do_con_write+0x14c/0x5b14 drivers/tty/vt/vt.c:2863 con_write+0x34/0x58 drivers/tty/vt/vt.c:3246 gsmld_write+0x104/0x154 drivers/tty/n_gsm.c:3672 do_tty_write drivers/tty/tty_io.c:1018 [inline] file_tty_write+0x404/0x6f0 drivers/tty/tty_io.c:1089 tty_write+0x48/0x58 drivers/tty/tty_io.c:1110 call_write_iter include/linux/fs.h:1868 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x618/0x918 fs/read_write.c:584 ksys_write+0x15c/0x26c fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591