================================================================== BUG: KCSAN: data-race in __mpage_writepage / generic_write_end write to 0xffff88811eb73cf8 of 8 bytes by task 11548 on cpu 1: i_size_write include/linux/fs.h:897 [inline] generic_write_end+0x99/0x220 fs/buffer.c:2187 fat_write_end+0x4a/0x160 fs/fat/inode.c:249 generic_perform_write+0x23b/0x390 mm/filemap.c:3329 __generic_file_write_iter+0x154/0x330 mm/filemap.c:3447 generic_file_write_iter+0x2f3/0x3e0 mm/filemap.c:3479 call_write_iter include/linux/fs.h:1908 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x607/0x690 fs/read_write.c:578 ksys_write+0xce/0x180 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write fs/read_write.c:640 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:640 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88811eb73cf8 of 8 bytes by task 11554 on cpu 0: i_size_read include/linux/fs.h:875 [inline] __mpage_writepage+0x95/0x1070 fs/mpage.c:501 write_cache_pages+0x4cb/0x840 mm/page-writeback.c:2248 mpage_writepages+0x6d/0x120 fs/mpage.c:714 fat_writepages+0x20/0x30 fs/fat/inode.c:205 do_writepages+0x7b/0x150 mm/page-writeback.c:2354 __filemap_fdatawrite_range+0x19b/0x1d0 mm/filemap.c:421 generic_fadvise+0x316/0x420 mm/fadvise.c:113 vfs_fadvise mm/fadvise.c:185 [inline] ksys_fadvise64_64 mm/fadvise.c:199 [inline] __do_sys_fadvise64 mm/fadvise.c:214 [inline] __se_sys_fadvise64 mm/fadvise.c:212 [inline] __x64_sys_fadvise64+0xc5/0x100 mm/fadvise.c:212 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 11554 Comm: syz-executor.4 Not tainted 5.8.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================