random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
audit: type=1400 audit(1575512255.091:36): avc:  denied  { map } for  pid=7047 comm="syz-executor301" path="/root/syz-executor301661781" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
BUG: unable to handle kernel NULL pointer dereference at 0000000000000002
IP: writeb arch/x86/include/asm/io.h:65 [inline]
IP: mem_serial_out+0x70/0x90 drivers/tty/serial/8250/8250_port.c:408
PGD 94412067 P4D 94412067 PUD 89e2c067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7047 Comm: syz-executor301 Not tainted 4.14.157-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880900ac700 task.stack: ffff888075fb8000
RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:mem_serial_out+0x70/0x90 drivers/tty/serial/8250/8250_port.c:408
RSP: 0018:ffff888075fbf968 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: 1ffffffff1490d50 RSI: 0000000000000002 RDI: ffffffff8a486a80
RBP: ffff888075fbf980 R08: ffff8880900ac700 R09: ffff8880900acfc8
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8a486a40
R13: 0000000000000001 R14: 0000000000000004 R15: ffff8880a4440ef8
FS:  000000000209b880(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 0000000091664000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 serial_out drivers/tty/serial/8250/8250.h:120 [inline]
 serial8250_clear_fifos.part.0+0x3a/0xb0 drivers/tty/serial/8250/8250_port.c:557
 serial8250_clear_fifos drivers/tty/serial/8250/8250_port.c:556 [inline]
 serial8250_do_startup+0x3e8/0x1d80 drivers/tty/serial/8250/8250_port.c:2198
 serial8250_startup+0x5c/0x80 drivers/tty/serial/8250/8250_port.c:2411
 uart_port_startup drivers/tty/serial/serial_core.c:231 [inline]
 uart_startup.part.0+0x2e9/0x720 drivers/tty/serial/serial_core.c:270
 uart_startup drivers/tty/serial/serial_core.c:267 [inline]
 uart_set_info drivers/tty/serial/serial_core.c:1010 [inline]
 uart_set_info_user drivers/tty/serial/serial_core.c:1038 [inline]
 uart_ioctl+0x12e9/0x2610 drivers/tty/serial/serial_core.c:1361
 tty_ioctl+0x841/0x1320 drivers/tty/tty_io.c:2661
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x440219
RSP: 002b:00007ffd309edc18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440219
RDX: 0000000020000240 RSI: 000000000000541f RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000401b30 R11: 0000000000000246 R12: 0000000000401aa0
R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000
Code: 24 d1 00 00 00 49 8d 7c 24 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 19 48 63 db 49 03 5c 24 40 <44> 88 2b 5b 41 5c 41 5d 5d c3 e8 d1 6c 37 fe eb c0 e8 2a 6d 37 
RIP: writeb arch/x86/include/asm/io.h:65 [inline] RSP: ffff888075fbf968
RIP: mem_serial_out+0x70/0x90 drivers/tty/serial/8250/8250_port.c:408 RSP: ffff888075fbf968
CR2: 0000000000000002
---[ end trace aa0c380ca4d65d80 ]---