================================================================== BUG: KCSAN: data-race in mark_buffer_dirty_inode / sync_mapping_buffers write to 0xffff888009731330 of 8 bytes by task 17598 on cpu 0: __remove_assoc_queue fs/buffer.c:481 [inline] fsync_buffers_list fs/buffer.c:713 [inline] sync_mapping_buffers+0x155/0x7e0 fs/buffer.c:548 fat_file_fsync+0xa9/0x100 fs/fat/file.c:194 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2843 [inline] generic_file_write_iter+0x103/0x130 mm/filemap.c:3740 call_write_iter include/linux/fs.h:1977 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4c0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 iter_file_splice_write+0x40a/0x750 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888009731330 of 8 bytes by task 17582 on cpu 1: mark_buffer_dirty_inode+0x92/0x1b0 fs/buffer.c:581 fat_mirror_bhs+0x205/0x330 fs/fat/fatent.c:396 fat_alloc_clusters+0x95e/0xa50 fs/fat/fatent.c:541 fat_add_cluster fs/fat/inode.c:108 [inline] __fat_get_block fs/fat/inode.c:155 [inline] fat_get_block+0x213/0x5a0 fs/fat/inode.c:190 __block_write_begin_int+0x4a2/0x1090 fs/buffer.c:2011 __block_write_begin fs/buffer.c:2061 [inline] block_write_begin+0x4f/0x1b0 fs/buffer.c:2121 cont_write_begin+0x525/0x7d0 fs/buffer.c:2470 fat_write_begin+0x61/0xf0 fs/fat/inode.c:235 generic_perform_write+0x196/0x3a0 mm/filemap.c:3575 __generic_file_write_iter+0x15c/0x340 mm/filemap.c:3704 generic_file_write_iter+0x75/0x130 mm/filemap.c:3736 call_write_iter include/linux/fs.h:1977 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6f9/0x7e0 fs/read_write.c:605 ksys_write+0xce/0x180 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 17582 Comm: syz-executor.2 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================