================================================================== BUG: KCSAN: data-race in mb_free_blocks / mb_update_avg_fragment_size write to 0xffff88810043d318 of 4 bytes by task 1810 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 do_unlinkat+0x293/0x4f0 fs/namei.c:4099 __do_sys_unlink fs/namei.c:4139 [inline] __se_sys_unlink fs/namei.c:4137 [inline] __x64_sys_unlink+0x2c/0x30 fs/namei.c:4137 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88810043d318 of 4 bytes by task 1806 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_free_blocks+0x9e4/0xb40 fs/ext4/mballoc.c:1856 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 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1806 Comm: syz-executor.1 Not tainted 5.13.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================