BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 509c4067 P4D 509c4067 PUD 509c5067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 13806 Comm: syz-executor.3 Not tainted 4.19.136-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
RIP: 0010:do_syscall_64+0x19c/0x620 arch/x86/entry/common.c:296
Code: 03 00 00 e8 c6 15 69 00 9c 58 0f 1f 44 00 00 25 00 02 00 00 31 ff 48 89 c3 48 89 c6 e8 3d 17 69 00 48 85 db 0f 84 00 03 00 00 <00> 00 00 00 00 44 89 e3 31 ff 81 e3 91 00 00 10 89 de e8 fd 16 69
RSP: 0018:ffff888049c97f28 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffffffff81009993
RDX: 0000000000000200 RSI: ffff88804f4aa340 RDI: 0000000000000007
RBP: ffff888049c97f58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff88d25b58 R14: 0000000000000000 R15: 0000000000000000
FS:  00000000014f5940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000509c3000 CR4: 00000000001406e0
DR0: a1bfe378d3723a74 DR1: 53a66f7d558a4018 DR2: c640886d3ccd2fa7
DR3: 01c8fd71efaa7ec3 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b141
Code: 75 14 b8 23 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 54 d1 fb ff c3 48 83 ec 08 e8 ea 46 00 00 48 89 04 24 b8 23 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 33 47 00 00 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fff6ca99840 EFLAGS: 00000293 ORIG_RAX: 0000000000000023
RAX: 0000000000000000 RBX: 00000000000809aa RCX: 000000000045b141
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fff6ca99850
RBP: 000000000000144e R08: 0000000000000000 R09: 00000000014f5940
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fff6ca998a0 R14: 00000000000809aa R15: 00007fff6ca998b0
Modules linked in:
CR2: 0000000000000000
---[ end trace 60a57973262dc319 ]---
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
RIP: 0010:syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
RIP: 0010:do_syscall_64+0x19c/0x620 arch/x86/entry/common.c:296
PGD 5893c067 
Code: 03 00 00 e8 c6 15 69 00 9c 58 0f 1f 44 00 00 25 00 02 00 00 31 ff 48 89 c3 48 89 c6 e8 3d 17 69 00 48 85 db 0f 84 00 03 00 00 <00> 00 00 00 00 44 89 e3 31 ff 81 e3 91 00 00 10 89 de e8 fd 16 69
P4D 5893c067 
RSP: 0018:ffff888049c97f28 EFLAGS: 00010206
PUD 5893d067 
PMD 0 
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffffffff81009993
Oops: 0002 [#2] PREEMPT SMP KASAN
RDX: 0000000000000200 RSI: ffff88804f4aa340 RDI: 0000000000000007
CPU: 0 PID: 6869 Comm: syz-executor.4 Tainted: G      D           4.19.136-syzkaller #0
RBP: ffff888049c97f58 R08: 0000000000000000 R09: 0000000000000000
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000000
RIP: 0010:syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
RIP: 0010:do_syscall_64+0x19c/0x620 arch/x86/entry/common.c:296
R13: ffffffff88d25b58 R14: 0000000000000000 R15: 0000000000000000
Code: 03 00 00 e8 c6 15 69 00 9c 58 0f 1f 44 00 00 25 00 02 00 00 31 ff 48 89 c3 48 89 c6 e8 3d 17 69 00 48 85 db 0f 84 00 03 00 00 <00> 00 00 00 00 44 89 e3 31 ff 81 e3 91 00 00 10 89 de e8 fd 16 69
FS:  00000000014f5940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
RSP: 0000:ffff888058997f28 EFLAGS: 00010206
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffffffff81009993
CR2: 0000000000000000 CR3: 00000000509c3000 CR4: 00000000001406e0
RDX: 0000000000000200 RSI: ffff8880589840c0 RDI: 0000000000000007
DR0: a1bfe378d3723a74 DR1: 53a66f7d558a4018 DR2: c640886d3ccd2fa7
RBP: ffff888058997f58 R08: 0000000000000000 R09: 0000000000000000
DR3: 01c8fd71efaa7ec3 DR6: 00000000fffe0ff0 DR7: 0000000000000400
R10: 0000000000000007 R11: 0000000000000001 R12: 0000000000000000