================================================================== BUG: KCSAN: data-race in generic_write_end / next_uptodate_page write to 0xffff88810a188608 of 8 bytes by task 6296 on cpu 1: i_size_write include/linux/fs.h:901 [inline] generic_write_end+0x9f/0x240 fs/buffer.c:2304 ext4_da_write_end+0x49e/0x700 fs/ext4/inode.c:2988 generic_perform_write+0x26d/0x410 mm/filemap.c:3934 ext4_buffered_write_iter+0x1f6/0x370 fs/ext4/file.c:299 ext4_file_write_iter+0x283/0x1230 call_write_iter include/linux/fs.h:1877 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x4ab/0x7d0 fs/read_write.c:584 ksys_write+0xeb/0x1a0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x42/0x50 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff88810a188608 of 8 bytes by task 6301 on cpu 0: i_size_read include/linux/fs.h:879 [inline] next_uptodate_page+0x47b/0x560 mm/filemap.c:3465 next_map_page mm/filemap.c:3490 [inline] filemap_map_pages+0x6df/0x890 mm/filemap.c:3567 do_fault_around mm/memory.c:4510 [inline] do_read_fault mm/memory.c:4542 [inline] do_fault mm/memory.c:4670 [inline] do_pte_missing mm/memory.c:3664 [inline] handle_pte_fault mm/memory.c:4939 [inline] __handle_mm_fault mm/memory.c:5079 [inline] handle_mm_fault+0x104d/0x2c10 mm/memory.c:5233 faultin_page mm/gup.c:959 [inline] __get_user_pages+0x42e/0xd20 mm/gup.c:1258 populate_vma_page_range mm/gup.c:1649 [inline] __mm_populate+0x23b/0x360 mm/gup.c:1758 mm_populate include/linux/mm.h:3213 [inline] vm_mmap_pgoff+0x1a3/0x240 mm/util.c:548 ksys_mmap_pgoff+0x2b8/0x330 mm/mmap.c:1409 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x0000000000fda000 -> 0x0000000000fdc000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 6301 Comm: syz-executor.3 Not tainted 6.5.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 ==================================================================