BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 6f868067 P4D 6f868067 PUD 28198067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 18274 Comm: syz-executor.1 Not tainted 6.2.0-rc6-syzkaller-00083-ge7368fd30165 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc900165e7088 EFLAGS: 00010246
RAX: 1ffffffff165b270 RBX: ffffea00019cf800 RCX: 0000000000040000
RDX: ffffc9000b2a1000 RSI: ffffc900165e74e0 RDI: ffffea00019cf800
RBP: ffffffff8b2d9380 R08: ffffffff81bb6186 R09: fffffbfff1d2daae
R10: fffffbfff1d2daae R11: 1ffffffff1d2daad R12: dffffc0000000000
R13: ffffea00019cf800 R14: ffff8880464836c0 R15: ffffc900165e74e0
FS:  00007fde06fb0700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000007654b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __writepage+0x60/0x120 mm/page-writeback.c:2537
 write_cache_pages+0x7cd/0x1340 mm/page-writeback.c:2472
 generic_writepages mm/page-writeback.c:2563 [inline]
 do_writepages+0x424/0x680 mm/page-writeback.c:2583
 filemap_fdatawrite_wbc+0x11e/0x170 mm/filemap.c:388
 __filemap_fdatawrite_range mm/filemap.c:421 [inline]
 file_write_and_wait_range+0x219/0x320 mm/filemap.c:777
 __generic_file_fsync+0x6e/0x190 fs/libfs.c:1132
 generic_file_fsync+0x6f/0xe0 fs/libfs.c:1173
 generic_write_sync include/linux/fs.h:2885 [inline]
 udf_file_write_iter+0x4d6/0x5f0 fs/udf/file.c:176
 do_iter_write+0x6c2/0xc20 fs/read_write.c:861
 iter_file_splice_write+0x7fc/0xfc0 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0xe6/0x1c0 fs/splice.c:931
 splice_direct_to_actor+0x4e4/0xc00 fs/splice.c:886
 do_splice_direct+0x279/0x3d0 fs/splice.c:974
 do_sendfile+0x5fb/0xf80 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64+0x14f/0x1b0 fs/read_write.c:1309
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fde0628c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fde06fb0168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fde063abf80 RCX: 00007fde0628c0c9
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006
RBP: 00007fde062e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0001000000201005 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd475cbadf R14: 00007fde06fb0300 R15: 0000000000022000
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc900165e7088 EFLAGS: 00010246
RAX: 1ffffffff165b270 RBX: ffffea00019cf800 RCX: 0000000000040000
RDX: ffffc9000b2a1000 RSI: ffffc900165e74e0 RDI: ffffea00019cf800
RBP: ffffffff8b2d9380 R08: ffffffff81bb6186 R09: fffffbfff1d2daae
R10: fffffbfff1d2daae R11: 1ffffffff1d2daad R12: dffffc0000000000
R13: ffffea00019cf800 R14: ffff8880464836c0 R15: ffffc900165e74e0
FS:  00007fde06fb0700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000007654b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400