syzbot

BUG: sleeping function called from invalid context at kernel/printk/printk.c:2623
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 3544, name: syz-executor376
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
3 locks held by syz-executor376/3544:
 #0: ffff888079dff098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffff888079dff130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:944 [inline]
 #1: ffff888079dff130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:967 [inline]
 #1: ffff888079dff130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write+0x1f5/0x890 drivers/tty/tty_io.c:1089
 #2: ffff8880182923e0 (&gsm->tx_lock){....}-{2:2}, at: gsmld_write+0x5b/0x120 drivers/tty/n_gsm.c:3060
irq event stamp: 18468
hardirqs last  enabled at (18467): [<ffffffff8a8abe8e>] syscall_enter_from_user_mode+0x2e/0x230 kernel/entry/common.c:117
hardirqs last disabled at (18468): [<ffffffff8a94f81c>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (18468): [<ffffffff8a94f81c>] _raw_spin_lock_irqsave+0xac/0x120 kernel/locking/spinlock.c:162
softirqs last  enabled at (16926): [<ffffffff8132acaf>] local_bh_disable include/linux/bottom_half.h:20 [inline]
softirqs last  enabled at (16926): [<ffffffff8132acaf>] fpregs_lock arch/x86/include/asm/fpu/api.h:72 [inline]
softirqs last  enabled at (16926): [<ffffffff8132acaf>] fpu_reset_fpregs arch/x86/kernel/fpu/core.c:682 [inline]
softirqs last  enabled at (16926): [<ffffffff8132acaf>] fpu_flush_thread+0x1df/0x340 arch/x86/kernel/fpu/core.c:743
softirqs last disabled at (16924): [<ffffffff8132acaf>] local_bh_disable include/linux/bottom_half.h:20 [inline]
softirqs last disabled at (16924): [<ffffffff8132acaf>] fpregs_lock arch/x86/include/asm/fpu/api.h:72 [inline]
softirqs last disabled at (16924): [<ffffffff8132acaf>] fpu_reset_fpregs arch/x86/kernel/fpu/core.c:682 [inline]
softirqs last disabled at (16924): [<ffffffff8132acaf>] fpu_flush_thread+0x1df/0x340 arch/x86/kernel/fpu/core.c:743
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 3544 Comm: syz-executor376 Not tainted 6.1.90-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 __might_resched+0x5cb/0x780 kernel/sched/core.c:9942
 console_lock+0x1c/0x1c0 kernel/printk/printk.c:2623
 do_con_write+0x110/0x7270 drivers/tty/vt/vt.c:2908
 con_write+0x20/0x40 drivers/tty/vt/vt.c:3295
 gsmld_write+0xf9/0x120 drivers/tty/n_gsm.c:3063
 do_tty_write drivers/tty/tty_io.c:1018 [inline]
 file_tty_write+0x504/0x890 drivers/tty/tty_io.c:1089
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x7ae/0xba0 fs/read_write.c:584
 ksys_write+0x19c/0x2c0 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fdc063fb569
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:00007fff68d6bf08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fff68d6c0d8 RCX: 00007fdc063fb569
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fdc0646e610 R08: 00007fff68d6bc17 R09: 00007fff68d6c0d8
R10: 000000000000000d R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff68d6c0c8 R14: 0000000000000001 R15: 0000000000000001