================================================================== BUG: KCSAN: data-race in _copy_to_iter / fat16_ent_put write to 0xffff88814e9ca3d4 of 2 bytes by task 8248 on cpu 0: fat16_ent_put+0x24/0x50 fs/fat/fatent.c:183 fat_alloc_clusters+0x47d/0xa80 fs/fat/fatent.c:503 fat_add_cluster fs/fat/inode.c:108 [inline] __fat_get_block fs/fat/inode.c:155 [inline] fat_get_block+0x263/0x600 fs/fat/inode.c:190 __block_write_begin_int+0x33d/0xc50 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x73/0x170 fs/buffer.c:2102 cont_write_begin+0x3f1/0x520 fs/buffer.c:2456 fat_write_begin+0x5d/0xe0 fs/fat/inode.c:230 generic_perform_write+0x1d4/0x3f0 mm/filemap.c:3772 __generic_file_write_iter+0x172/0x280 mm/filemap.c:3868 generic_file_write_iter+0x79/0x1c0 mm/filemap.c:3932 do_iter_write+0x494/0x750 fs/read_write.c:861 vfs_writev fs/read_write.c:934 [inline] do_pwritev+0x235/0x430 fs/read_write.c:1031 __do_sys_pwritev2 fs/read_write.c:1090 [inline] __se_sys_pwritev2 fs/read_write.c:1081 [inline] __x64_sys_pwritev2+0x7e/0xa0 fs/read_write.c:1081 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff88814e9ca000 of 1377 bytes by task 8252 on cpu 1: instrument_copy_to_user include/linux/instrumented.h:120 [inline] copyout lib/iov_iter.c:169 [inline] _copy_to_iter+0x135/0x910 lib/iov_iter.c:529 copy_page_to_iter+0x31b/0x450 lib/iov_iter.c:727 copy_folio_to_iter include/linux/uio.h:172 [inline] filemap_read+0x11db/0x1510 mm/filemap.c:2745 blkdev_read_iter+0x2c6/0x370 block/fops.c:591 call_read_iter include/linux/fs.h:2183 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x3a5/0x560 fs/read_write.c:470 ksys_read+0xe8/0x1a0 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:621 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8252 Comm: udevd Not tainted 6.2.0-rc3-syzkaller-00349-g97ec4d559d93-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 ==================================================================