syzbot

BUG: sleeping function called from invalid context at kernel/printk/printk.c:2653
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 5071, name: syz-executor255
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
3 locks held by syz-executor255/5071:
 #0: ffff88802d1cc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffff88802d1cc130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:954 [inline]
 #1: ffff88802d1cc130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: iterate_tty_write drivers/tty/tty_io.c:973 [inline]
 #1: ffff88802d1cc130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write+0x1f3/0x9b0 drivers/tty/tty_io.c:1096
 #2: ffff888043e913e0 (&gsm->tx_lock){....}-{2:2}, at: gsmld_write+0x5f/0x130 drivers/tty/n_gsm.c:3721
irq event stamp: 5088
hardirqs last  enabled at (5087): [<ffffffff8b7f0bd3>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline]
hardirqs last  enabled at (5087): [<ffffffff8b7f0bd3>] _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:202
hardirqs last disabled at (5088): [<ffffffff8b7f07f0>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (5088): [<ffffffff8b7f07f0>] _raw_spin_lock_irqsave+0xb0/0x120 kernel/locking/spinlock.c:162
softirqs last  enabled at (5024): [<ffffffff81597642>] invoke_softirq kernel/softirq.c:428 [inline]
softirqs last  enabled at (5024): [<ffffffff81597642>] __irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633
softirqs last disabled at (4995): [<ffffffff81597642>] invoke_softirq kernel/softirq.c:428 [inline]
softirqs last disabled at (4995): [<ffffffff81597642>] __irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 5071 Comm: syz-executor255 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 __might_resched+0x5d4/0x780 kernel/sched/core.c:10187
 console_lock+0x20/0x1b0 kernel/printk/printk.c:2653
 do_con_write+0x114/0x7820 drivers/tty/vt/vt.c:2862
 con_write+0x26/0x40 drivers/tty/vt/vt.c:3251
 gsmld_write+0x100/0x130 drivers/tty/n_gsm.c:3724
 iterate_tty_write drivers/tty/tty_io.c:1021 [inline]
 file_tty_write+0x551/0x9b0 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+0xa86/0xcb0 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_64+0xfd/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f3939d5a569
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:00007ffdd5ff10c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd5ff1298 RCX: 00007f3939d5a569
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004