================================================================== BUG: KCSAN: data-race in generic_write_end / next_uptodate_page write to 0xffff8881252ac2a8 of 8 bytes by task 25080 on cpu 0: i_size_write include/linux/fs.h:916 [inline] generic_write_end+0x96/0x180 fs/buffer.c:2186 ext4_da_write_end+0x59b/0x730 fs/ext4/inode.c:3116 generic_perform_write+0x251/0x3e0 mm/filemap.c:3781 ext4_buffered_write_iter+0x305/0x400 fs/ext4/file.c:269 ext4_file_write_iter+0x2e7/0x11f0 call_write_iter include/linux/fs.h:2163 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7bc/0x900 fs/read_write.c:594 ksys_write+0xd9/0x190 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:656 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881252ac2a8 of 8 bytes by task 25102 on cpu 1: i_size_read include/linux/fs.h:894 [inline] next_uptodate_page+0x323/0x670 mm/filemap.c:3256 next_map_page mm/filemap.c:3281 [inline] filemap_map_pages+0x771/0x880 mm/filemap.c:3337 do_fault_around mm/memory.c:4152 [inline] do_read_fault mm/memory.c:4167 [inline] do_fault mm/memory.c:4301 [inline] handle_pte_fault mm/memory.c:4559 [inline] __handle_mm_fault mm/memory.c:4694 [inline] handle_mm_fault+0xb08/0x1580 mm/memory.c:4792 faultin_page mm/gup.c:937 [inline] __get_user_pages+0x381/0xc50 mm/gup.c:1158 populate_vma_page_range mm/gup.c:1490 [inline] __mm_populate+0x24d/0x370 mm/gup.c:1599 mm_populate include/linux/mm.h:2624 [inline] vm_mmap_pgoff+0x160/0x1f0 mm/util.c:524 ksys_mmap_pgoff+0x284/0x350 mm/mmap.c:1624 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000c0f000 -> 0x0000000000c10000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 25102 Comm: syz-executor.2 Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================