780187f090
supported in Tcl9. Use "-translation binary" instead. FossilOrigin-Name: e0d9670dd98a22d2e22aac8ba8720787a05e280e18ec9b2d4323f947c83718f5
124 lines
3.1 KiB
Plaintext
124 lines
3.1 KiB
Plaintext
# 2023 January 31
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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set testprefix pendingrace
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# This test file tests that a race condition surrounding hot-journal
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# rollback that once existed has been resolved. The problem was that
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# if, when attempting to upgrade from a SHARED to EXCLUSIVE lock in
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# order to roll back a hot journal, a connection failed to take the
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# lock, the file-descriptor was left holding a PENDING lock for
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# a very short amount of time. In a multi-threaded deployment, this
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# could allow a second connection to read the database without rolling
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# back the hot journal.
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#
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testvfs tvfs
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db close
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sqlite3 db test.db -vfs tvfs
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# Create a 20 page database using connection [db]. Connection [db] uses
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# Tcl VFS wrapper "tvfs", but it is configured to do straight pass-through
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# for now.
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#
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do_execsql_test 1.0 {
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PRAGMA cache_size = 5;
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CREATE TABLE t1(a, b);
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CREATE INDEX i1 ON t1(a, b);
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WITH s(i) AS (
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SELECT 1 UNION ALL SELECT i+1 FROM s WHERE i<10
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)
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INSERT INTO t1 SELECT hex(randomblob(100)), hex(randomblob(100)) FROM s;
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} {}
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do_test 1.1a {
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set nPg [db one { PRAGMA page_count }]
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expr ($nPg==20 || $nPg==21)
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} 1
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# Simulate a crash in another process. This leaves the db with a hot-journal.
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# Without the journal the db is corrupt.
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#
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sqlite3 db2 test.db
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do_execsql_test -db db2 1.1 {
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PRAGMA cache_size = 5;
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BEGIN;
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UPDATE t1 SET b=hex(randomblob(100));
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}
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db_save
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db2 close
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proc my_db_restore {} {
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forcecopy sv_test.db-journal test.db-journal
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set fd1 [open sv_test.db r]
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fconfigure $fd1 -translation binary
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set data [read $fd1]
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close $fd1
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set fd1 [open test.db w]
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fconfigure $fd1 -translation binary
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puts -nonewline $fd1 $data
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close $fd1
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}
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my_db_restore
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do_test 1.2 {
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file exists test.db-journal
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} {1}
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# Set up connection [db2] to use Tcl VFS wrapper [tvfs2]. Which is configured
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# so that the first call to xUnlock() fails. And then all VFS calls thereafter
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# fail as well.
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#
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testvfs tvfs2
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tvfs2 filter xUnlock
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tvfs2 script xUnlock
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set ::seen_unlock 0
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proc xUnlock {args} {
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if {$::seen_unlock==0} {
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set ::seen_unlock 1
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tvfs2 ioerr 1 1
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tvfs2 filter {xLock xUnlock}
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}
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return ""
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}
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sqlite3 db2 test.db -vfs tvfs2
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# Configure [tvfs] (used by [db]) so that within the first call to xAccess,
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# [db2] attempts to read the db. This causes [db2] to fail to upgrade to
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# EXCLUSIVE, leaving it with a PENDING lock. Which it holds on to,
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# as the xUnlock() and all subsequent VFS calls fail.
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#
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tvfs filter xAccess
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tvfs script xAccess
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set ::seen_access 0
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proc xAccess {args} {
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if {$::seen_access==0} {
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set ::seen_access 1
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catch { db2 eval { SELECT count(*)+0 FROM t1 } }
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breakpoint
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}
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return ""
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}
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# Run an integrity check using [db].
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do_catchsql_test 1.3 {
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PRAGMA integrity_check
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} {1 {database is locked}}
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db close
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db2 close
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tvfs delete
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tvfs2 delete
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finish_test
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