VFS: Found a Xenix FS (block size = 1024) on device loop2
syz.2.4719: attempt to access beyond end of device
loop2: rw=0, sector=6491536, nr_sectors = 2 limit=128
Buffer I/O error on dev loop2, logical block 3245768, async page read
=====================================================
BUG: KMSAN: uninit-value in sysv_new_inode+0x588/0x1c90 fs/sysv/ialloc.c:153
 sysv_new_inode+0x588/0x1c90 fs/sysv/ialloc.c:153
 sysv_mknod+0x8f/0x290 fs/sysv/namei.c:53
 sysv_create+0x51/0x60 fs/sysv/namei.c:67
 lookup_open fs/namei.c:3595 [inline]
 open_last_lookups fs/namei.c:3694 [inline]
 path_openat+0x2e9e/0x6200 fs/namei.c:3930
 do_filp_open+0x20e/0x590 fs/namei.c:3960
 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_creat fs/open.c:1506 [inline]
 __se_sys_creat fs/open.c:1500 [inline]
 __ia32_sys_creat+0xe4/0x140 fs/open.c:1500
 ia32_sys_call+0x37a3/0x40d0 arch/x86/include/generated/asm/syscalls_32.h:9
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was created at:
 __alloc_pages_noprof+0x9a7/0xe00 mm/page_alloc.c:4756
 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265
 alloc_pages_noprof mm/mempolicy.c:2345 [inline]
 folio_alloc_noprof+0x1db/0x310 mm/mempolicy.c:2352
 filemap_alloc_folio_noprof+0xa6/0x440 mm/filemap.c:1010
 __filemap_get_folio+0xac4/0x1550 mm/filemap.c:1952
 grow_dev_folio fs/buffer.c:1043 [inline]
 grow_buffers fs/buffer.c:1109 [inline]
 __getblk_slow fs/buffer.c:1135 [inline]
 bdev_getblk+0x2c9/0xab0 fs/buffer.c:1437
 __bread_gfp+0x93/0x730 fs/buffer.c:1491
 sb_bread include/linux/buffer_head.h:346 [inline]
 fat__get_entry fs/fat/dir.c:100 [inline]
 fat_get_entry+0xc27/0x10e0 fs/fat/dir.c:128
 fat_get_short_entry fs/fat/dir.c:885 [inline]
 fat_subdirs+0x244/0x3d0 fs/fat/dir.c:951
 fat_read_root+0x66c/0x790 fs/fat/inode.c:1345
 fat_fill_super+0x4587/0x5470 fs/fat/inode.c:1814
 vfat_fill_super+0x3c/0x50 fs/fat/namei_vfat.c:1200
 get_tree_bdev+0x684/0x890 fs/super.c:1635
 vfat_get_tree+0x34/0x40 fs/fat/namei_vfat.c:1205
 vfs_get_tree+0xb1/0x5a0 fs/super.c:1800
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3507
 path_mount+0x742/0x1f10 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x722/0x810 fs/namespace.c:4032
 __ia32_sys_mount+0xe3/0x150 fs/namespace.c:4032
 ia32_sys_call+0x2530/0x40d0 arch/x86/include/generated/asm/syscalls_32.h:22
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 0 UID: 0 PID: 16123 Comm: syz.2.4719 Not tainted 6.12.0-rc3-syzkaller-00454-gdb87114dcf13 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================