================================================================== BUG: KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks write to 0xffff888129eb3884 of 4 bytes by task 8727 on cpu 1: mb_free_blocks+0x152/0xfa0 fs/ext4/mballoc.c:1492 ext4_free_blocks+0xfdc/0x18c0 fs/ext4/mballoc.c:5291 ext4_remove_blocks+0x5a7/0xa50 fs/ext4/extents.c:2497 ext4_ext_rm_leaf+0x563/0xe80 fs/ext4/extents.c:2663 ext4_ext_remove_space+0x8c9/0x14a0 fs/ext4/extents.c:2911 ext4_ext_truncate+0xf9/0x160 fs/ext4/extents.c:4371 ext4_truncate+0x889/0xc20 fs/ext4/inode.c:4216 ext4_evict_inode+0x9cf/0xc20 fs/ext4/inode.c:280 evict+0x19f/0x470 fs/inode.c:576 iput_final fs/inode.c:1652 [inline] iput+0x44a/0x550 fs/inode.c:1678 dentry_unlink_inode+0x210/0x220 fs/dcache.c:374 d_delete+0x78/0xa0 fs/dcache.c:2470 vfs_rmdir+0x284/0x2a0 fs/namei.c:3726 do_rmdir+0x16e/0x300 fs/namei.c:3773 __do_sys_rmdir fs/namei.c:3791 [inline] __se_sys_rmdir fs/namei.c:3789 [inline] __x64_sys_rmdir+0x2c/0x30 fs/namei.c:3789 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888129eb3884 of 4 bytes by task 8719 on cpu 0: ext4_mb_good_group_nolock fs/ext4/mballoc.c:2180 [inline] ext4_mb_regular_allocator+0x866/0x18e0 fs/ext4/mballoc.c:2413 ext4_mb_new_blocks+0x304/0xcf0 fs/ext4/mballoc.c:4920 ext4_ext_map_blocks+0x164e/0x20c0 fs/ext4/extents.c:4238 ext4_map_blocks+0x6bf/0xf40 fs/ext4/inode.c:625 ext4_getblk+0x67/0x2e0 fs/ext4/inode.c:832 ext4_bread+0x3a/0x1f0 fs/ext4/inode.c:882 ext4_append+0xda/0x1c0 fs/ext4/namei.c:67 ext4_init_new_dir fs/ext4/namei.c:2765 [inline] ext4_mkdir+0x4b6/0xc90 fs/ext4/namei.c:2810 vfs_mkdir+0x288/0x350 fs/namei.c:3649 do_mkdirat+0x132/0x220 fs/namei.c:3672 __do_sys_mkdir fs/namei.c:3688 [inline] __se_sys_mkdir fs/namei.c:3686 [inline] __x64_sys_mkdir+0x32/0x40 fs/namei.c:3686 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 8719 Comm: syz-executor.1 Not tainted 5.9.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================