building syzkaller on 62cc6db33feb828eeda65dcf8749b4674ccd5246...
fetching kernel...
checked out kernel commit aabd761612dbeb7d40750d485da219d11433718a ("Linux 5.15.215", 2026-08-07 08:07:31 +0200 +0200)
cleaning kernel...
building kernel...
kernel built successfully with compiler Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
testing patch...
reproduced crash: BUG: unable to handle kernel NULL pointer dereference in ntfs_sparse_cluster