================================================================== BUG: KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used write to 0xffff8881013cea94 of 4 bytes by task 25046 on cpu 0: mb_mark_used+0x13b/0xc50 fs/ext4/mballoc.c:1947 ext4_mb_use_best_found+0x102/0x300 fs/ext4/mballoc.c:2019 ext4_mb_find_by_goal+0x5d9/0x880 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+0x1658/0x2120 fs/ext4/extents.c:4285 ext4_map_blocks+0x71e/0xf00 fs/ext4/inode.c:637 ext4_alloc_file_blocks+0x281/0x730 fs/ext4/extents.c:4472 ext4_fallocate+0x2a7/0x540 fs/ext4/extents.c:4753 vfs_fallocate+0x486/0x720 fs/open.c:307 do_vfs_ioctl+0x13cb/0x14a0 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x83/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 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 0xffff8881013cea94 of 4 bytes by task 25049 on cpu 1: 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+0x1658/0x2120 fs/ext4/extents.c:4285 ext4_map_blocks+0x71e/0xf00 fs/ext4/inode.c:637 ext4_alloc_file_blocks+0x281/0x730 fs/ext4/extents.c:4472 ext4_fallocate+0x2a7/0x540 fs/ext4/extents.c:4753 vfs_fallocate+0x486/0x720 fs/open.c:307 do_vfs_ioctl+0x13cb/0x14a0 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x83/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 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: 0x00003055 -> 0x00002855 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 25049 Comm: syz-executor.2 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================