BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 78342067 P4D 78342067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6314 Comm: syz.2.436 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc900031efcc0 EFLAGS: 00010296
RAX: 1ffffffff14b89b7 RBX: ffffea000162d7c8 RCX: ffffffff8a5c4db8
RDX: ffffc9000ff31000 RSI: 00000000000024a8 RDI: ffffea000162d7c0
RBP: 0000000000000000 R08: ffffea000162d7c7 R09: 1ffffd40002c5af8
R10: dffffc0000000000 R11: fffff940002c5af9 R12: ffffea000162d7c0
R13: ffffea000162d7c0 R14: ffffffffffffffff R15: 0000000000000001
FS:  00007f8997e5f6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000004aef6000 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+0x76f/0xd60 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: 0033:0x7f8999c47799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8997e5f028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f8999ec1180 RCX: 00007f8999c47799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f8999cddbd9 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000008ffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8999ec1218 R14: 00007f8999ec1180 R15: 00007ffc78ead088
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 13dfccd958a8999f ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc900031efcc0 EFLAGS: 00010296
RAX: 1ffffffff14b89b7 RBX: ffffea000162d7c8 RCX: ffffffff8a5c4db8
RDX: ffffc9000ff31000 RSI: 00000000000024a8 RDI: ffffea000162d7c0
RBP: 0000000000000000 R08: ffffea000162d7c7 R09: 1ffffd40002c5af8
R10: dffffc0000000000 R11: fffff940002c5af9 R12: ffffea000162d7c0
R13: ffffea000162d7c0 R14: ffffffffffffffff R15: 0000000000000001
FS:  00007f8997e5f6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000004aef6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400