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Debug info: Can't create/write to file '/tmp/#sql-temptable-2853-15019-5001.MAI' (Errcode: 30 "Read-only file system")
SELECT
bi.id,
COALESCE(bp.id, bs.id) AS blockpositionid,
bi.blockname,
bi.parentcontextid,
bi.showinsubcontexts,
bi.pagetypepattern,
bi.requiredbytheme,
bi.subpagepattern,
bi.defaultregion,
bi.defaultweight,
COALESCE(bp.visible, bs.visible, 1) AS visible,
COALESCE(bp.region, bs.region, bi.defaultregion) AS region,
COALESCE(bp.weight, bs.weight, bi.defaultweight) AS weight,
bi.configdata
, ctx.id AS ctxid, ctx.path AS ctxpath, ctx.depth AS ctxdepth, ctx.contextlevel AS ctxlevel, ctx.instanceid AS ctxinstance, ctx.locked AS ctxlocked

FROM mdl_block_instances bi
JOIN mdl_block b ON bi.blockname = b.name
LEFT JOIN mdl_block_positions bp ON bp.blockinstanceid = bi.id
AND bp.contextid = ?
AND bp.pagetype = ?
AND bp.subpage = ?
LEFT JOIN mdl_block_positions bs ON bs.blockinstanceid = bi.id
AND bs.contextid = ?
AND bs.pagetype = ?
AND bs.subpage = ?
LEFT JOIN mdl_context ctx ON (ctx.instanceid = bi.id AND ctx.contextlevel = ?)

WHERE
(bi.parentcontextid IN (?, ?) OR (bi.showinsubcontexts = 1 AND bi.parentcontextid = ?))
AND bi.pagetypepattern IN (?,?,?,?)
AND (bi.subpagepattern IS NULL OR bi.subpagepattern = ?)
AND (bp.visible = 1 OR bp.visible IS NULL) AND (bs.visible = 1 OR bs.visible IS NULL)
AND b.visible = 1
AND (bi.requiredbytheme = 0)

ORDER BY
COALESCE(bp.region, bs.region, bi.defaultregion),
COALESCE(bp.weight, bs.weight, bi.defaultweight),
bi.id
[array (
0 => 703131,
1 => 'blog-index',
2 => '',
3 => 1,
4 => 'blog-index',
5 => '',
6 => 80,
7 => 703131,
8 => 1,
9 => '1',
10 => 'blog-index',
11 => 'blog-index-*',
12 => 'blog-*',
13 => '*',
14 => '',
)]
Error code: dmlreadexception

Stack trace:

• line 486 of /lib/dml/moodle_database.php: dml_read_exception thrown
• line 291 of /lib/dml/moodle_read_slave_trait.php: call to moodle_database->query_end()
• line 1212 of /lib/dml/mysqli_native_moodle_database.php: call to mysqli_native_moodle_database->query_end()
• line 791 of /lib/blocklib.php: call to mysqli_native_moodle_database->get_recordset_sql()
• line 1642 of /lib/pagelib.php: call to block_manager->load_blocks()
• line 1110 of /lib/pagelib.php: call to moodle_page->starting_output()
• line 1394 of /lib/outputrenderers.php: call to moodle_page->set_state()
• line 1980 of /lib/setuplib.php: call to core_renderer->header()
• line 165 of /blog/index.php: call to bootstrap_renderer->__call()