================================================================== BUG: KCSAN: data-race in ext4_mb_regular_allocator / mb_mark_used write to 0xffff8881013a4a94 of 4 bytes by task 2850 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_check_limits fs/ext4/mballoc.c:2091 [inline] ext4_mb_complex_scan_group+0x81f/0x880 fs/ext4/mballoc.c:2371 ext4_mb_regular_allocator+0x19c8/0x24a0 fs/ext4/mballoc.c:2778 ext4_mb_new_blocks+0x78c/0x1ee0 fs/ext4/mballoc.c:5586 ext4_new_meta_blocks+0x84/0x180 fs/ext4/balloc.c:699 ext4_ext_grow_indepth fs/ext4/extents.c:1321 [inline] ext4_ext_create_new_leaf fs/ext4/extents.c:1427 [inline] ext4_ext_insert_extent+0xa10/0x3060 fs/ext4/extents.c:2097 ext4_split_extent_at+0x6eb/0xcd0 fs/ext4/extents.c:3251 ext4_force_split_extent_at fs/ext4/extents.c:319 [inline] ext4_swap_extents+0xd7a/0x1470 fs/ext4/extents.c:5707 move_extent_per_page fs/ext4/move_extent.c:339 [inline] ext4_move_extents+0x1fb1/0x2210 fs/ext4/move_extent.c:673 __ext4_ioctl fs/ext4/ioctl.c:988 [inline] ext4_ioctl+0x1532/0x2170 fs/ext4/ioctl.c:1279 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xcb/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 0xffff8881013a4a94 of 4 bytes by task 2874 on cpu 1: ext4_mb_good_group_nolock fs/ext4/mballoc.c:2504 [inline] ext4_mb_regular_allocator+0xa97/0x24a0 fs/ext4/mballoc.c:2747 ext4_mb_new_blocks+0x78c/0x1ee0 fs/ext4/mballoc.c:5586 ext4_new_meta_blocks+0x84/0x180 fs/ext4/balloc.c:699 ext4_ext_grow_indepth fs/ext4/extents.c:1321 [inline] ext4_ext_create_new_leaf fs/ext4/extents.c:1427 [inline] ext4_ext_insert_extent+0xa10/0x3060 fs/ext4/extents.c:2097 ext4_split_extent_at+0x6eb/0xcd0 fs/ext4/extents.c:3251 ext4_force_split_extent_at fs/ext4/extents.c:319 [inline] ext4_swap_extents+0xc9d/0x1470 fs/ext4/extents.c:5700 move_extent_per_page fs/ext4/move_extent.c:339 [inline] ext4_move_extents+0x1fb1/0x2210 fs/ext4/move_extent.c:673 __ext4_ioctl fs/ext4/ioctl.c:988 [inline] ext4_ioctl+0x1532/0x2170 fs/ext4/ioctl.c:1279 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xcb/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: 0x000023f2 -> 0x000023f1 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2874 Comm: syz-executor.2 Not tainted 5.16.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================