================================================================== BUG: KCSAN: data-race in mb_free_blocks / mb_update_avg_fragment_size write to 0xffff8881013df614 of 4 bytes by task 30316 on cpu 0: mb_free_blocks+0x156/0xb40 fs/ext4/mballoc.c:1798 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_setattr+0xacc/0xec0 fs/ext4/inode.c:5504 notify_change+0x8a3/0xa80 fs/attr.c:398 do_truncate+0xe8/0x130 fs/open.c:64 handle_truncate fs/namei.c:3017 [inline] do_open fs/namei.c:3365 [inline] path_openat+0x1a79/0x20b0 fs/namei.c:3494 do_filp_open+0xd9/0x1f0 fs/namei.c:3521 do_sys_openat2+0xa3/0x250 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_creat fs/open.c:1277 [inline] __se_sys_creat fs/open.c:1271 [inline] __x64_sys_creat+0x62/0x80 fs/open.c:1271 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881013df614 of 4 bytes by task 30360 on cpu 1: ext4_mb_avg_fragment_size_cmp fs/ext4/mballoc.c:835 [inline] ext4_mb_rb_insert fs/ext4/mballoc.c:811 [inline] mb_update_avg_fragment_size+0x184/0x260 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_truncate_failed_write fs/ext4/truncate.h:20 [inline] ext4_handle_inode_extension fs/ext4/file.c:358 [inline] ext4_dio_write_iter fs/ext4/file.c:574 [inline] ext4_file_write_iter+0x106c/0x11d0 fs/ext4/file.c:678 call_write_iter include/linux/fs.h:2114 [inline] aio_write+0x287/0x360 fs/aio.c:1578 __io_submit_one fs/aio.c:1837 [inline] io_submit_one+0x82f/0x1350 fs/aio.c:1880 __do_sys_io_submit fs/aio.c:1939 [inline] __se_sys_io_submit+0xf5/0x260 fs/aio.c:1909 __x64_sys_io_submit+0x3f/0x50 fs/aio.c:1909 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: 1 PID: 30360 Comm: syz-executor.3 Not tainted 5.13.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================