syzbot

BUG: sleeping function called from invalid context at drivers/tty/vt/vt.c:2599
in_atomic(): 1, irqs_disabled(): 1, pid: 8093, name: syz-executor404
3 locks held by syz-executor404/8093:
 #0: 0000000063ef4ac6 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: 00000000af96c4af (&(&tty->flow_lock)->rlock){....}, at: spin_lock_irq include/linux/spinlock.h:354 [inline]
 #1: 00000000af96c4af (&(&tty->flow_lock)->rlock){....}, at: n_tty_ioctl_helper+0xcc/0x3a0 drivers/tty/tty_ioctl.c:914
 #2: 0000000063ef4ac6 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref+0x1d/0x80 drivers/tty/tty_ldisc.c:293
irq event stamp: 8148
hardirqs last  enabled at (8147): [<ffffffff81007641>] do_syscall_64+0x21/0x620 arch/x86/entry/common.c:280
hardirqs last disabled at (8148): [<ffffffff88194e05>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline]
hardirqs last disabled at (8148): [<ffffffff88194e05>] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:160
softirqs last  enabled at (6902): [<ffffffff88400678>] __do_softirq+0x678/0x980 kernel/softirq.c:318
softirqs last disabled at (6875): [<ffffffff813927d5>] invoke_softirq kernel/softirq.c:372 [inline]
softirqs last disabled at (6875): [<ffffffff813927d5>] irq_exit+0x215/0x260 kernel/softirq.c:412
Preemption disabled at:
[<0000000000000000>]           (null)
CPU: 0 PID: 8093 Comm: syz-executor404 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6192
 do_con_write+0x116/0x1d90 drivers/tty/vt/vt.c:2599
 con_write+0x22/0xb0 drivers/tty/vt/vt.c:3163
 n_hdlc_send_frames+0x278/0x470 drivers/tty/n_hdlc.c:403
 n_hdlc_tty_wakeup+0xa0/0xc0 drivers/tty/n_hdlc.c:479
 tty_wakeup+0xd4/0x110 drivers/tty/tty_io.c:534
 __start_tty drivers/tty/tty_io.c:806 [inline]
 __start_tty+0x116/0x150 drivers/tty/tty_io.c:799
 n_tty_ioctl_helper+0x348/0x3a0 drivers/tty/tty_ioctl.c:917
 n_hdlc_tty_ioctl+0x102/0x350 drivers/tty/n_hdlc.c:783
 tty_ioctl+0x65d/0x1630 drivers/tty/tty_io.c:2678
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fd9a050b489
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffca0cdf2c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd9a050b489
RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000008