================================================================== BUG: KCSAN: data-race in block_page_mkwrite / generic_write_end write to 0xffff888122e91a78 of 8 bytes by task 16331 on cpu 1: i_size_write include/linux/fs.h:908 [inline] generic_write_end+0x99/0x230 fs/buffer.c:2185 ext4_da_write_end+0x448/0x510 fs/ext4/inode.c:3068 generic_perform_write+0x261/0x400 mm/filemap.c:3803 ext4_buffered_write_iter+0x19d/0x290 fs/ext4/file.c:270 ext4_file_write_iter+0x21a/0xd70 call_write_iter include/linux/fs.h:2081 [inline] new_sync_write fs/read_write.c:504 [inline] vfs_write+0x7de/0x930 fs/read_write.c:591 ksys_write+0xd9/0x190 fs/read_write.c:644 __do_sys_write fs/read_write.c:656 [inline] __se_sys_write fs/read_write.c:653 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:653 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+0x44/0xae read to 0xffff888122e91a78 of 8 bytes by task 16336 on cpu 0: i_size_read include/linux/fs.h:886 [inline] block_page_mkwrite+0xbb/0x4c0 fs/buffer.c:2506 ext4_page_mkwrite+0x664/0xdb0 fs/ext4/inode.c:6074 do_page_mkwrite mm/memory.c:2885 [inline] do_shared_fault+0x223/0x7c0 mm/memory.c:4301 do_fault mm/memory.c:4369 [inline] handle_pte_fault mm/memory.c:4623 [inline] __handle_mm_fault mm/memory.c:4759 [inline] handle_mm_fault+0x8a7/0xca0 mm/memory.c:4857 do_user_addr_fault+0x617/0xb90 arch/x86/mm/fault.c:1397 handle_page_fault arch/x86/mm/fault.c:1484 [inline] exc_page_fault+0x91/0x290 arch/x86/mm/fault.c:1540 asm_exc_page_fault+0x1e/0x30 copy_user_enhanced_fast_string+0xe/0x40 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] copyout lib/iov_iter.c:155 [inline] copy_page_to_iter_iovec lib/iov_iter.c:226 [inline] __copy_page_to_iter lib/iov_iter.c:852 [inline] copy_page_to_iter+0x435/0x7c0 lib/iov_iter.c:880 copy_folio_to_iter include/linux/uio.h:153 [inline] filemap_read+0xb2f/0xe10 mm/filemap.c:2736 generic_file_read_iter+0x72/0x320 mm/filemap.c:2831 call_read_iter include/linux/fs.h:2075 [inline] do_iter_readv_writev+0x2fb/0x380 fs/read_write.c:724 do_iter_read+0x192/0x5d0 fs/read_write.c:787 vfs_readv fs/read_write.c:907 [inline] do_preadv+0x159/0x240 fs/read_write.c:999 __do_sys_preadv fs/read_write.c:1049 [inline] __se_sys_preadv fs/read_write.c:1044 [inline] __x64_sys_preadv+0x54/0x60 fs/read_write.c:1044 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+0x44/0xae value changed: 0x0000000000fd0000 -> 0x0000000000fd3000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 16336 Comm: syz-executor.5 Not tainted 5.17.0-syzkaller-10752-g52d543b5497c-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================