loop0: detected capacity change from 0 to 264192 ================================================================== BUG: KCSAN: data-race in xas_create / xas_find write to 0xffff888130946481 of 1 bytes by task 3966 on cpu 1: xas_expand lib/xarray.c:611 [inline] xas_create+0x699/0xb30 lib/xarray.c:652 xas_store+0x70/0xca0 lib/xarray.c:784 __add_to_page_cache_locked+0x1eb/0x4b0 mm/filemap.c:910 add_to_page_cache_lru+0xa0/0x1b0 mm/filemap.c:967 page_cache_ra_unbounded+0x262/0x410 mm/readahead.c:221 do_page_cache_ra mm/readahead.c:267 [inline] force_page_cache_ra+0x246/0x280 mm/readahead.c:299 page_cache_sync_ra+0xcc/0xe0 mm/readahead.c:573 page_cache_sync_readahead include/linux/pagemap.h:884 [inline] filemap_get_pages mm/filemap.c:2467 [inline] filemap_read+0x388/0x1220 mm/filemap.c:2550 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2701 blkdev_read_iter+0xb9/0xf0 fs/block_dev.c:1671 call_read_iter include/linux/fs.h:2108 [inline] new_sync_read fs/read_write.c:415 [inline] vfs_read+0x565/0x5d0 fs/read_write.c:496 ksys_read+0xce/0x180 fs/read_write.c:634 __do_sys_read fs/read_write.c:644 [inline] __se_sys_read fs/read_write.c:642 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:642 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888130946481 of 1 bytes by task 4036 on cpu 0: xas_find+0x2d9/0x3c0 lib/xarray.c:1257 find_get_entry mm/filemap.c:1923 [inline] find_lock_entries+0x90/0x520 mm/filemap.c:2037 truncate_inode_pages_range+0xfb/0xa70 mm/truncate.c:320 truncate_inode_pages+0x20/0x30 mm/truncate.c:424 kill_bdev fs/block_dev.c:86 [inline] set_blocksize+0x24e/0x270 fs/block_dev.c:166 sb_set_blocksize+0x2c/0xa0 fs/block_dev.c:175 fat_fill_super+0x12fe/0x2a80 fs/fat/inode.c:1681 msdos_fill_super+0x29/0x30 fs/fat/namei_msdos.c:655 mount_bdev+0x1e8/0x290 fs/super.c:1368 msdos_mount+0x2d/0x40 fs/fat/namei_msdos.c:662 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x11d4/0x1ce0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3433 __x64_sys_mount+0x63/0x70 fs/namespace.c:3433 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x36 -> 0x00 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 4036 Comm: syz-executor.0 Not tainted 5.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)