BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 1d9113067 P4D 1d9113067 PUD 1c32b0067 PMD 0 
Oops: 0010 [#1] SMP KASAN
CPU: 1 PID: 6240 Comm: syz-executor6 Not tainted 4.17.0+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff880190b5f470 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88018ab71000 RCX: 1ffffffff10eac85
RDX: ffff880190b5f990 RSI: ffff8801b5b205c0 RDI: ffff8801b879cac0
RBP: ffff880190b5f5e0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880190b5f990
R13: ffff88018ab71012 R14: 1ffff1003216be93 R15: ffff88018ab71458
FS:  0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:00000000f5f96b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000190337000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sock_poll+0x1d4/0x720 net/socket.c:1168
 vfs_poll+0x77/0x2a0 fs/select.c:40
 do_pollfd fs/select.c:848 [inline]
 do_poll fs/select.c:896 [inline]
 do_sys_poll+0x706/0x1120 fs/select.c:990
 __do_compat_sys_ppoll fs/select.c:1425 [inline]
 __se_compat_sys_ppoll fs/select.c:1398 [inline]
 __ia32_compat_sys_ppoll+0x2f7/0x600 fs/select.c:1398
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f9acb9
Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 
RSP: 002b:00000000f5f960ac EFLAGS: 00000282 ORIG_RAX: 0000000000000135
RAX: ffffffffffffffda RBX: 00000000200002c0 RCX: 0000000000000001
RDX: 0000000020000380 RSI: 00000000200003c0 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000000
---[ end trace ba6fb4c6b8686527 ]---
RIP: 0010:          (null)
binder: 6241:6243 Acquire 1 refcount change on invalid ref 0 ret -22
Code: Bad RIP value.
RSP: 0018:ffff880190b5f470 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88018ab71000 RCX: 1ffffffff10eac85
RDX: ffff880190b5f990 RSI: ffff8801b5b205c0 RDI: ffff8801b879cac0
RBP: ffff880190b5f5e0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880190b5f990
R13: ffff88018ab71012 R14: 1ffff1003216be93 R15: ffff88018ab71458
FS:  0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:00000000f5f96b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000190337000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400