================================================================== BUG: KCSAN: data-race in copy_page_to_iter / ext4_mb_mark_diskspace_used write to 0xffff888146a85000 of 8 bytes by task 32079 on cpu 0: instrument_write include/linux/instrumented.h:42 [inline] __set_bit include/asm-generic/bitops/instrumented-non-atomic.h:27 [inline] __set_bit_le include/asm-generic/bitops/le.h:100 [inline] mb_set_bit fs/ext4/mballoc.c:471 [inline] ext4_set_bits fs/ext4/mballoc.c:1705 [inline] ext4_mb_mark_diskspace_used+0x5fc/0xca0 fs/ext4/mballoc.c:3847 ext4_mb_new_blocks+0xae3/0x1fc0 fs/ext4/mballoc.c:5604 ext4_ext_map_blocks+0x15ed/0x1ff0 fs/ext4/extents.c:4250 ext4_map_blocks+0x71e/0xf00 fs/ext4/inode.c:637 _ext4_get_block+0x103/0x290 fs/ext4/inode.c:793 ext4_get_block_unwritten+0x26/0x30 fs/ext4/inode.c:824 __block_write_begin_int+0x4c5/0x1080 fs/buffer.c:2006 __block_write_begin+0x2b/0x40 fs/buffer.c:2056 ext4_write_begin+0x41e/0xcc0 ext4_da_write_begin+0x208/0x7f0 fs/ext4/inode.c:2966 generic_perform_write+0x1b8/0x3e0 mm/filemap.c:3770 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 0xffff888146a85000 of 1377 bytes by task 32082 on cpu 1: instrument_copy_to_user include/linux/instrumented.h:119 [inline] copyout lib/iov_iter.c:156 [inline] copy_page_to_iter_iovec lib/iov_iter.c:228 [inline] __copy_page_to_iter lib/iov_iter.c:805 [inline] copy_page_to_iter+0x2cb/0x950 lib/iov_iter.c:833 filemap_read+0xee6/0x1220 mm/filemap.c:2683 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2779 blkdev_read_iter+0xb9/0xf0 block/fops.c:544 call_read_iter include/linux/fs.h:2157 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x66c/0x750 fs/read_write.c:485 ksys_read+0xd9/0x190 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:631 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 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 32082 Comm: systemd-udevd Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================