================================================================== BUG: KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks write to 0xffff8881017cab54 of 4 bytes by task 1775 on cpu 0: mb_free_blocks+0x156/0xb40 fs/ext4/mballoc.c:1798 ext4_free_blocks+0x1418/0x1b50 fs/ext4/mballoc.c:5989 ext4_remove_blocks+0x61a/0x800 fs/ext4/extents.c:2502 ext4_ext_rm_leaf+0x670/0xd20 fs/ext4/extents.c:2668 ext4_ext_remove_space+0x901/0x1300 fs/ext4/extents.c:2916 ext4_ext_truncate+0xfe/0x170 fs/ext4/extents.c:4377 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+0x430/0x580 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:3919 do_rmdir+0x14a/0x2e0 fs/namei.c:3968 __do_sys_rmdir fs/namei.c:3986 [inline] __se_sys_rmdir fs/namei.c:3984 [inline] __x64_sys_rmdir+0x2c/0x30 fs/namei.c:3984 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881017cab54 of 4 bytes by task 29171 on cpu 1: ext4_mb_good_group_nolock fs/ext4/mballoc.c:2492 [inline] ext4_mb_regular_allocator+0xae9/0x2520 fs/ext4/mballoc.c:2729 ext4_mb_new_blocks+0x762/0x1f90 fs/ext4/mballoc.c:5515 ext4_ext_map_blocks+0x1569/0x1f00 fs/ext4/extents.c:4245 ext4_map_blocks+0x70d/0xef0 fs/ext4/inode.c:638 ext4_getblk+0xb1/0x3d0 fs/ext4/inode.c:848 ext4_bread+0x28/0x100 fs/ext4/inode.c:900 ext4_append+0xd1/0x1c0 fs/ext4/namei.c:67 ext4_init_new_dir+0x177/0x500 fs/ext4/namei.c:2885 ext4_mkdir+0x329/0x760 fs/ext4/namei.c:2931 vfs_mkdir+0x2a4/0x370 fs/namei.c:3823 do_mkdirat+0x11d/0x200 fs/namei.c:3848 __do_sys_mkdir fs/namei.c:3866 [inline] __se_sys_mkdir fs/namei.c:3864 [inline] __x64_sys_mkdir+0x32/0x40 fs/namei.c:3864 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00005085 -> 0x00005086 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 29171 Comm: syz-executor.4 Not tainted 5.14.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================