loop4: detected capacity change from 0 to 16 cramfs: Error -3 while decompressing! cramfs: ffffffff907f2868(27)->ffff888054e51000(4096) ===================================================== BUG: KMSAN: uninit-value in ondemand_readahead+0xd4b/0x1720 mm/readahead.c:596 ondemand_readahead+0xd4b/0x1720 mm/readahead.c:596 page_cache_sync_ra+0x733/0x770 mm/readahead.c:709 page_cache_sync_readahead include/linux/pagemap.h:1210 [inline] cramfs_blkdev_read+0x602/0x1240 fs/cramfs/inode.c:217 cramfs_read fs/cramfs/inode.c:278 [inline] cramfs_read_folio+0x91a/0x10f0 fs/cramfs/inode.c:890 read_pages+0xdf4/0x1190 mm/readahead.c:181 page_cache_ra_unbounded+0x88b/0x950 mm/readahead.c:270 do_page_cache_ra mm/readahead.c:300 [inline] page_cache_ra_order+0x100d/0x10a0 mm/readahead.c:560 ondemand_readahead+0x11e2/0x1720 mm/readahead.c:682 page_cache_sync_ra+0x733/0x770 mm/readahead.c:709 page_cache_sync_readahead include/linux/pagemap.h:1210 [inline] filemap_get_pages mm/filemap.c:2600 [inline] filemap_read+0xa39/0x4430 mm/filemap.c:2694 generic_file_read_iter+0x128/0xaa0 mm/filemap.c:2840 __kernel_read+0x3c1/0xaa0 fs/read_write.c:428 integrity_kernel_read+0x80/0xb0 security/integrity/iint.c:199 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline] ima_calc_file_hash+0x18b6/0x3e30 security/integrity/ima/ima_crypto.c:573 ima_collect_measurement+0x56a/0xb10 security/integrity/ima/ima_api.c:292 process_measurement+0x20eb/0x3710 security/integrity/ima/ima_main.c:339 ima_file_check+0xbc/0x120 security/integrity/ima/ima_main.c:519 do_open fs/namei.c:3559 [inline] path_openat+0x4a01/0x5710 fs/namei.c:3714 do_filp_open+0x249/0x660 fs/namei.c:3741 do_sys_openat2+0x1f0/0x910 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_compat_sys_openat fs/open.c:1386 [inline] __se_compat_sys_openat fs/open.c:1384 [inline] __ia32_compat_sys_openat+0x2a7/0x330 fs/open.c:1384 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Local variable ra created at: cramfs_blkdev_read+0xb9/0x1240 fs/cramfs/inode.c:186 cramfs_read fs/cramfs/inode.c:278 [inline] cramfs_read_folio+0x91a/0x10f0 fs/cramfs/inode.c:890 CPU: 1 PID: 7636 Comm: syz-executor.4 Not tainted 6.2.0-rc6-syzkaller-80422-geda666ff2276 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 =====================================================