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日志重演EIO并发sync block_dev,数据丢失挂载仍然成功导致文件系统损坏
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#I828EV
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chengzhihao
Opened this issue
2023-09-18 14:48
<!-- #请根据issue的类型在标题左侧下拉框中选择对应的选项(需求、缺陷或CVE等)--> <!-- #请根据issue相关的版本在里程碑中选择对应的节点,若是与版本无关,请选择“不关联里程碑”--> 问题流程: ``` mount kpartx wb_workfn jbd2_journal_recover do_one_pass mark_bh_dirty // 把日志区内容拷贝到磁盘buffer,并置脏 block_write_full_page submit_bh_wbc 故障注入发生IO错误 end_buffer_async_write mark_buffer_write_io_error mapping_set_error(bh->b_page->mapping, -EIO) set_bit(AS_EIO, &mapping->flags) // 设置error vfs_read generic_file_read_iter // dio filemap_write_and_wait_range filemap_check_errors test_and_clear_bit(AS_EIO, &mapping->flags) // clear error err2 = sync_blockdev(journal->j_fs_dev) filemap_write_and_wait filemap_check_errors test_and_clear_bit(AS_EIO, &mapping->flags) // 返回false err2 = 0 ``` 导致日志重演落盘失败,但是sync_blockdev返回0,挂载成功。日志恢复流程结束后,ext4磁盘数据损坏
<!-- #请根据issue的类型在标题左侧下拉框中选择对应的选项(需求、缺陷或CVE等)--> <!-- #请根据issue相关的版本在里程碑中选择对应的节点,若是与版本无关,请选择“不关联里程碑”--> 问题流程: ``` mount kpartx wb_workfn jbd2_journal_recover do_one_pass mark_bh_dirty // 把日志区内容拷贝到磁盘buffer,并置脏 block_write_full_page submit_bh_wbc 故障注入发生IO错误 end_buffer_async_write mark_buffer_write_io_error mapping_set_error(bh->b_page->mapping, -EIO) set_bit(AS_EIO, &mapping->flags) // 设置error vfs_read generic_file_read_iter // dio filemap_write_and_wait_range filemap_check_errors test_and_clear_bit(AS_EIO, &mapping->flags) // clear error err2 = sync_blockdev(journal->j_fs_dev) filemap_write_and_wait filemap_check_errors test_and_clear_bit(AS_EIO, &mapping->flags) // 返回false err2 = 0 ``` 导致日志重演落盘失败,但是sync_blockdev返回0,挂载成功。日志恢复流程结束后,ext4磁盘数据损坏
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