loop1: detected capacity change from 0 to 16 ===================================================== BUG: KMSAN: uninit-value in ondemand_readahead+0xddf/0x1720 mm/readahead.c:596 ondemand_readahead+0xddf/0x1720 mm/readahead.c:596 page_cache_sync_ra+0x72b/0x760 mm/readahead.c:709 page_cache_sync_readahead include/linux/pagemap.h:1210 [inline] cramfs_blkdev_read fs/cramfs/inode.c:217 [inline] cramfs_read+0x611/0x1280 fs/cramfs/inode.c:278 cramfs_lookup+0x1b8/0x870 fs/cramfs/inode.c:767 lookup_open fs/namei.c:3391 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x24ea/0x5750 fs/namei.c:3711 do_filp_open+0x24d/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+0x2ab/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+0x37/0x80 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Local variable ra.i created at: cramfs_blkdev_read fs/cramfs/inode.c:186 [inline] cramfs_read+0xc0/0x1280 fs/cramfs/inode.c:278 cramfs_lookup+0x1b8/0x870 fs/cramfs/inode.c:767 CPU: 0 PID: 5457 Comm: syz-executor.1 Not tainted 6.2.0-syzkaller-81151-g224e1375d540 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 =====================================================