================================================================== BUG: KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used write to 0xffff88810043c614 of 4 bytes by task 17639 on cpu 1: mb_mark_used+0x13b/0xc50 fs/ext4/mballoc.c:1947 ext4_mb_use_best_found+0x102/0x300 fs/ext4/mballoc.c:2019 ext4_mb_simple_scan_group+0x253/0x3a0 fs/ext4/mballoc.c:2297 ext4_mb_regular_allocator+0x1918/0x24a0 fs/ext4/mballoc.c:2773 ext4_mb_new_blocks+0x78c/0x1ee0 fs/ext4/mballoc.c:5586 ext4_ext_map_blocks+0x15f4/0x20a0 fs/ext4/extents.c:4250 ext4_map_blocks+0x71e/0xf00 fs/ext4/inode.c:637 ext4_alloc_file_blocks+0x281/0x730 fs/ext4/extents.c:4437 ext4_zero_range+0x29e/0xae0 fs/ext4/extents.c:4550 ext4_fallocate+0x226/0x540 fs/ext4/extents.c:4687 vfs_fallocate+0x486/0x720 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0x75/0xc0 fs/open.c:336 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88810043c614 of 4 bytes by task 17637 on cpu 0: ext4_mb_find_by_goal+0x13f/0x880 fs/ext4/mballoc.c:2207 ext4_mb_regular_allocator+0x12b/0x24a0 fs/ext4/mballoc.c:2654 ext4_mb_new_blocks+0x78c/0x1ee0 fs/ext4/mballoc.c:5586 ext4_ext_map_blocks+0x15f4/0x20a0 fs/ext4/extents.c:4250 ext4_map_blocks+0x71e/0xf00 fs/ext4/inode.c:637 ext4_alloc_file_blocks+0x281/0x730 fs/ext4/extents.c:4437 ext4_zero_range+0x29e/0xae0 fs/ext4/extents.c:4550 ext4_fallocate+0x226/0x540 fs/ext4/extents.c:4687 vfs_fallocate+0x486/0x720 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0x75/0xc0 fs/open.c:336 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x000032f6 -> 0x00002af6 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 17637 Comm: syz-executor.1 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================