================================================================== BUG: KCSAN: data-race in mb_free_blocks / mb_update_avg_fragment_size write to 0xffff8881013cdb58 of 4 bytes by task 1774 on cpu 1: mb_free_blocks+0x323/0xb40 fs/ext4/mballoc.c:1833 ext4_free_blocks+0x1418/0x1b50 fs/ext4/mballoc.c:5988 ext4_remove_blocks+0x61a/0x800 fs/ext4/extents.c:2498 ext4_ext_rm_leaf+0x670/0xd20 fs/ext4/extents.c:2664 ext4_ext_remove_space+0x901/0x1300 fs/ext4/extents.c:2912 ext4_ext_truncate+0xfe/0x170 fs/ext4/extents.c:4370 ext4_truncate+0x76e/0xa80 fs/ext4/inode.c:4262 ext4_evict_inode+0xa54/0xdb0 fs/ext4/inode.c:288 evict+0x1c8/0x3c0 fs/inode.c:584 iput_final fs/inode.c:1660 [inline] iput+0x433/0x590 fs/inode.c:1686 dentry_unlink_inode+0x23a/0x260 fs/dcache.c:376 d_delete+0x78/0xe0 fs/dcache.c:2505 vfs_rmdir+0x2a6/0x2c0 fs/namei.c:3909 do_rmdir+0x14a/0x2e0 fs/namei.c:3958 __do_sys_rmdir fs/namei.c:3976 [inline] __se_sys_rmdir fs/namei.c:3974 [inline] __x64_sys_rmdir+0x2c/0x30 fs/namei.c:3974 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881013cdb58 of 4 bytes by task 5648 on cpu 0: ext4_mb_avg_fragment_size_cmp fs/ext4/mballoc.c:834 [inline] ext4_mb_rb_insert fs/ext4/mballoc.c:811 [inline] mb_update_avg_fragment_size+0x161/0x260 fs/ext4/mballoc.c:859 mb_mark_used+0xae0/0xc50 fs/ext4/mballoc.c:1993 ext4_mb_use_best_found+0x102/0x320 fs/ext4/mballoc.c:2014 ext4_mb_find_by_goal+0x5c3/0x890 fs/ext4/mballoc.c:2226 ext4_mb_regular_allocator+0x11c/0x2520 fs/ext4/mballoc.c:2635 ext4_mb_new_blocks+0x762/0x1f90 fs/ext4/mballoc.c:5514 ext4_ext_map_blocks+0x1569/0x1f00 fs/ext4/extents.c:4238 ext4_map_blocks+0x70d/0xef0 fs/ext4/inode.c:638 ext4_alloc_file_blocks+0x271/0x720 fs/ext4/extents.c:4425 ext4_fallocate+0x2a7/0x4d0 fs/ext4/extents.c:4705 vfs_fallocate+0x463/0x660 fs/open.c:311 file_ioctl fs/ioctl.c:497 [inline] do_vfs_ioctl+0x1322/0x1410 fs/ioctl.c:1048 __do_sys_ioctl fs/ioctl.c:1067 [inline] __se_sys_ioctl+0x83/0x140 fs/ioctl.c:1055 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:1055 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 5648 Comm: syz-executor.5 Not tainted 5.13.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================