bond0: Enslaving bond_slave_0 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): bond_slave_1: link is not ready bond0: Enslaving bond_slave_1 as an active interface with an up link IPVS: Creating netns size=2712 id=7 IPVS: ftp: loaded support on port[0] = 21 BUG: unable to handle kernel NULL pointer dereference at 0000000000000003 IP: [] writew arch/x86/include/asm/io.h:65 [inline] IP: [] mem16_serial_out+0x14/0x20 drivers/tty/serial/8250/8250_port.c:374 PGD b707b067 PUD b7140067 PMD 0 Oops: 0002 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 5841 Comm: syz-executor.0 Not tainted 4.4.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800b8848600 ti: ffff88012a96c000 task.ti: ffff88012a96c000 RIP: 0010:[] [] writew arch/x86/include/asm/io.h:65 [inline] RIP: 0010:[] [] mem16_serial_out+0x14/0x20 drivers/tty/serial/8250/8250_port.c:374 RSP: 0018:ffff88012a96fca0 EFLAGS: 00010206 RAX: 000000000000000a RBX: ffffffff8449b720 RCX: 0000000000000000 RDX: 00000000000000bf RSI: 0000000000000003 RDI: ffffffff8449b720 RBP: ffff88012a96fca0 R08: ffffffff82e9a9fc R09: 0000000000000000 R10: ffffffff82e9a9eb R11: 0000000000000000 R12: ffff8800b46fa000 R13: 0000000000000001 R14: ffff8800b46fa000 R15: ffffffff8449b720 FS: 00007fb291ccd700(0000) GS:ffff88012c000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000003 CR3: 00000000b707a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff88012a96fcd8 ffffffff81a4d3c1 ffff88021a1d89a8 ffff8800b46fa000 0000000000000001 ffff8800b46fa000 ffffffff8449b720 ffff88012a96fce8 ffffffff81a4d5a6 ffff88012a96fd20 ffffffff81a47bfd ffff88021a1d89a8 Call Trace: [] serial_port_out include/linux/serial_core.h:260 [inline] [] serial8250_do_startup+0x451/0x620 drivers/tty/serial/8250/8250_port.c:1849 [] serial8250_startup+0x16/0x20 drivers/tty/serial/8250/8250_port.c:2075 [] uart_port_startup drivers/tty/serial/serial_core.c:163 [inline] [] uart_startup.part.15+0x7d/0x190 drivers/tty/serial/serial_core.c:210 [] uart_startup drivers/tty/serial/serial_core.c:772 [inline] [] uart_set_info drivers/tty/serial/serial_core.c:916 [inline] [] uart_set_info_user drivers/tty/serial/serial_core.c:939 [inline] [] uart_ioctl+0x68f/0xaf0 drivers/tty/serial/serial_core.c:1232 [] tty_ioctl+0x385/0xe10 drivers/tty/tty_io.c:2942 [] vfs_ioctl fs/ioctl.c:43 [inline] [] do_vfs_ioctl+0x2dd/0x530 fs/ioctl.c:607 [] SYSC_ioctl fs/ioctl.c:622 [inline] [] SyS_ioctl+0x74/0x80 fs/ioctl.c:613 [] entry_SYSCALL_64_fastpath+0x16/0x76 Code: 89 e5 d3 e6 48 63 f6 48 03 77 40 88 16 5d c3 0f 1f 84 00 00 00 00 00 0f b6 8f c1 00 00 00 55 48 89 e5 d3 e6 48 63 f6 48 03 77 40 <66> 89 16 5d c3 0f 1f 80 00 00 00 00 0f b6 8f c1 00 00 00 55 48 RIP [] mem16_serial_out+0x14/0x20 drivers/tty/serial/8250/8250_port.c:374 RSP CR2: 0000000000000003 ---[ end trace 314bf364f7014a3c ]---