BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 6513b067 P4D 6513b067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4973 Comm: syz.0.95 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc9000328fcc0 EFLAGS: 00010296
RAX: 1ffffffff1478837 RBX: ffffea00016e3248 RCX: ffffffff8a3c41b8
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea00016e3240
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffff940002dc649
R10: fffff940002dc649 R11: 1ffffd40002dc648 R12: ffffea00016e3240
R13: ffffea00016e3240 R14: ffffffffffffffff R15: 0000000000000013
FS:  00007f81d6a1e6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000002317d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ntfs_sparse_cluster+0x82c/0xb80 fs/ntfs3/file.c:337
 ntfs_fallocate+0x73b/0xcc0 fs/ntfs3/file.c:707
 vfs_fallocate+0x587/0x6f0 fs/open.c:308
 ksys_fallocate fs/open.c:331 [inline]
 __do_sys_fallocate fs/open.c:339 [inline]
 __se_sys_fallocate fs/open.c:337 [inline]
 __x64_sys_fallocate+0xbd/0x100 fs/open.c:337
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f81d87f9749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f81d6a1e038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f81d8a50180 RCX: 00007f81d87f9749
RDX: 0000000000010000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f81d887df91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000020000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f81d8a50218 R14: 00007f81d8a50180 R15: 00007ffeeb731518
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 08c0302c99c42006 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc9000328fcc0 EFLAGS: 00010296
RAX: 1ffffffff1478837 RBX: ffffea00016e3248 RCX: ffffffff8a3c41b8
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea00016e3240
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffff940002dc649
R10: fffff940002dc649 R11: 1ffffd40002dc648 R12: ffffea00016e3240
R13: ffffea00016e3240 R14: ffffffffffffffff R15: 0000000000000013
FS:  00007f81d6a1e6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000002317d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400