BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 6c907067 P4D 6c907067 PUD 6c908067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9789 Comm: syz-executor.3 Not tainted 5.6.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
RIP: 0010:syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
RIP: 0010:do_syscall_32_irqs_on arch/x86/entry/common.c:352 [inline]
RIP: 0010:do_fast_syscall_32+0x4d1/0xe8f arch/x86/entry/common.c:408
Code: ff df 48 c1 ea 03 80 3c 02 00 0f 85 f6 08 00 00 4c 8b 3b 31 ff 45 89 fd 41 81 e5 0e 38 00 00 44 89 ee e8 22 60 71 00 45 85 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc90002157f18 EFLAGS: 00010006
RAX: 0000000000000000 RBX: ffff88806c97c300 RCX: ffffffff8100b4be
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffc90002157f58 R08: ffff88806c97c300 R09: ffffed100d92f861
R10: ffffed100d92f860 R11: ffff88806c97c307 R12: 00000000f7fb7e39
R13: 0000000000000000 R14: ffffc90002157fd8 R15: 0000000020024000
FS:  0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:0000000009dbf900
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000006c906000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
Modules linked in:
CR2: 0000000000000000
---[ end trace 8e876827d1e09d87 ]---
RIP: 0010:prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
RIP: 0010:syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
RIP: 0010:do_syscall_32_irqs_on arch/x86/entry/common.c:352 [inline]
RIP: 0010:do_fast_syscall_32+0x4d1/0xe8f arch/x86/entry/common.c:408
Code: ff df 48 c1 ea 03 80 3c 02 00 0f 85 f6 08 00 00 4c 8b 3b 31 ff 45 89 fd 41 81 e5 0e 38 00 00 44 89 ee e8 22 60 71 00 45 85 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc90002157f18 EFLAGS: 00010006
RAX: 0000000000000000 RBX: ffff88806c97c300 RCX: ffffffff8100b4be
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffc90002157f58 R08: ffff88806c97c300 R09: ffffed100d92f861
R10: ffffed100d92f860 R11: ffff88806c97c307 R12: 00000000f7fb7e39
R13: 0000000000000000 R14: ffffc90002157fd8 R15: 0000000020024000
FS:  0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:0000000009dbf900
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000006c906000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600