BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 923ca067 P4D 923ca067 PUD 92283067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9863 Comm: syz-executor.0 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffffc90006a8fd70 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888091854080 RCX: ffffffff86bae892
RDX: 1ffffffff18811b8 RSI: 0000000000000000 RDI: ffff8880942b2080
RBP: ffffc90006a8fda0 R08: ffff8880a8ee0100 R09: ffffed101285641d
R10: ffffed101285641c R11: ffff8880942b20e7 R12: ffff8880942b2080
R13: ffffffff8c408dc0 R14: ffff888091854098 R15: 0000000000000000
FS:  0000000001201940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000a5ff2000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 inet_release+0xed/0x200 net/ipv4/af_inet.c:427
 __sock_release+0xce/0x280 net/socket.c:605
 sock_close+0x1e/0x30 net/socket.c:1283
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x415fc1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffe4a987720 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000415fc1
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 01ffffffffffffff R09: 01ffffffffffffff
R10: 00007ffe4a987800 R11: 0000000000000293 R12: 000000000076bfc0
R13: 0000000000770bc8 R14: 00000000000f6b3d R15: 000000000076bfcc
Modules linked in:
CR2: 0000000000000000
---[ end trace 770cb13c715fd971 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffffc90006a8fd70 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888091854080 RCX: ffffffff86bae892
RDX: 1ffffffff18811b8 RSI: 0000000000000000 RDI: ffff8880942b2080
RBP: ffffc90006a8fda0 R08: ffff8880a8ee0100 R09: ffffed101285641d
R10: ffffed101285641c R11: ffff8880942b20e7 R12: ffff8880942b2080
R13: ffffffff8c408dc0 R14: ffff888091854098 R15: 0000000000000000
FS:  0000000001201940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000a5ff2000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400