kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 11009 Comm: syz-executor.1 Not tainted 4.14.184-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888094f5e0c0 task.stack: ffff888058ea8000
RIP: 0010:do_con_write.part.0+0x78e/0x1a20 drivers/tty/vt/vt.c:2411
RSP: 0018:ffff888058eaf8d0 EFLAGS: 00010203
RAX: 0000000020000001 RBX: 000000010000000e RCX: ffffc90006c7d000
RDX: 000000000000027a RSI: ffffffff833fefe2 RDI: ffff88806adc65fd
RBP: 000000000000075e R08: 0000000000000001 R09: 0000000000000000
R10: ffff888094f5e9e8 R11: ffff888094f5e0c0 R12: dffffc0000000000
R13: ffff88806adc660c R14: ffff88806adc6280 R15: ffff888058eafa49
FS:  00007f9b003dd700(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c001af4480 CR3: 000000005dcc9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_con_write drivers/tty/vt/vt.c:2809 [inline]
 con_put_char+0xb4/0xc0 drivers/tty/vt/vt.c:2808
 tty_put_char+0xa3/0x120 drivers/tty/tty_io.c:2879
 __process_echoes+0x489/0x8c0 drivers/tty/n_tty.c:728
 flush_echoes drivers/tty/n_tty.c:829 [inline]
 __receive_buf drivers/tty/n_tty.c:1648 [inline]
 n_tty_receive_buf_common+0x940/0x2490 drivers/tty/n_tty.c:1742
 tiocsti drivers/tty/tty_io.c:2186 [inline]
 tty_ioctl+0xd5f/0x1220 drivers/tty/tty_io.c:2572
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45c1d9
RSP: 002b:00007f9b003dcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000000121c0 RCX: 000000000045c1d9
RDX: 0000000020000800 RSI: 0000000000005412 RDI: 0000000000000003
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007fffa000f4df R14: 00007f9b003dd9c0 R15: 000000000078bf0c
Code: 24 b2 00 00 00 66 03 6c 24 38 e8 fe b5 1a fe 48 8b 44 24 78 80 38 00 0f 85 d2 10 00 00 49 8b 9e a0 03 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 14 20 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 
RIP: do_con_write.part.0+0x78e/0x1a20 drivers/tty/vt/vt.c:2411 RSP: ffff888058eaf8d0
---[ end trace 222db009a71d2fcd ]---