sp0: Synchronizing with TNC
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: 30056 Comm: syz-executor.0 Not tainted 4.14.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a0592500 task.stack: ffff888058b90000
RIP: 0010:do_con_write+0x702/0x19b0 drivers/tty/vt/vt.c:2411
RSP: 0018:ffff888058b97a00 EFLAGS: 00010207
RAX: 000000001ffffff5 RBX: 00000000000007fe RCX: ffffc90006c87000
RDX: 000000000003a45f RSI: ffffffff83480915 RDI: ffff88808d90907d
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffff8880a0592500 R12: ffff88808d908d00
R13: ffff88808d90908c R14: 00000000ffffffac R15: ffff888058b97ba9
FS:  00007f81089fc700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1df78aa710 CR3: 000000005d034000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2798
 tnc_init drivers/net/hamradio/6pack.c:541 [inline]
 sixpack_open+0x958/0xc70 drivers/net/hamradio/6pack.c:643
 tty_ldisc_open+0x6c/0xb0 drivers/tty/tty_ldisc.c:481
 tty_set_ldisc+0x287/0x5d0 drivers/tty/tty_ldisc.c:606
 tiocsetd drivers/tty/tty_io.c:2351 [inline]
 tty_ioctl+0xa2a/0x13c0 drivers/tty/tty_io.c:2595
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 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: 0033:0x45c1f9
RSP: 002b:00007f81089fbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000017f00 RCX: 000000000045c1f9
RDX: 0000000020000040 RSI: 0000000000005423 RDI: 0000000000000005
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffc49557e4f R14: 00007f81089fc9c0 R15: 000000000078bf0c
Code: b2 00 00 00 66 03 5c 24 30 e8 5b 8d 13 fe 48 8b 44 24 78 80 38 00 0f 85 4c 10 00 00 4d 8b b4 24 a0 03 00 00 4c 89 f0 48 c1 e8 03 <0f> b6 14 28 4c 89 f0 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 
RIP: do_con_write+0x702/0x19b0 drivers/tty/vt/vt.c:2411 RSP: ffff888058b97a00
---[ end trace ffcb9e3be822e6fb ]---