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https://github.com/sqlite/sqlite.git
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Add mutexes to fix a race condition in wal.c. This isn't a very good fix.
FossilOrigin-Name: 3d159939cc2beb18c4ca0c8e9a99a75d4107e6e4
This commit is contained in:
dan
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manifest
32
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@ -1,8 +1,5 @@
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-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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C Change\sthe\snames\sof\sthe\slog.c\sand\slog.h\ssource\sfiles\sto\swal.c\sand\swal.h.
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D 2010-04-26T00:19:45
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C Add\smutexes\sto\sfix\sa\srace\scondition\sin\swal.c.\sThis\sisn't\sa\svery\sgood\sfix.
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D 2010-04-26T10:40:52
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F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
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F Makefile.in d83a0ffef3dcbfb08b410a6c6dd6c009ec9167fb
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F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
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@ -176,7 +173,7 @@ F src/sqliteLimit.h 3afab2291762b5d09ae20c18feb8e9fa935a60a6
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F src/status.c 4df6fe7dce2d256130b905847c6c60055882bdbe
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F src/table.c 2cd62736f845d82200acfa1287e33feb3c15d62e
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F src/tclsqlite.c e27e0457109d72c7404df08af1726ff6ddc3d92c
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F src/test1.c 8b4c246c41e75c3ff033edb2e8c2cf15820861ae
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F src/test1.c 64b5b8135080b94370e8100e5066bb394f5c3122
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F src/test2.c b6b43413d495addd039a88b87d65c839f86b18cb
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F src/test3.c 4c21700c73a890a47fc685c1097bfb661346ac94
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F src/test4.c ad03bb987ddedce928f4258c1e7fa4109a73497d
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@ -224,8 +221,8 @@ F src/vdbeblob.c 5327132a42a91e8b7acfb60b9d2c3b1c5c863e0e
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F src/vdbemem.c 2a82f455f6ca6f78b59fb312f96054c04ae0ead1
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F src/vdbetrace.c 864cef96919323482ebd9986f2132435115e9cc2
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F src/vtab.c a0f8a40274e4261696ef57aa806de2776ab72cda
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F src/wal.c df5283ae70cce52852fd788479bee22994fccbe5 w src/log.c
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F src/wal.h 1a34bb71642b46af5e6d51c2f69ae0f55268df81 w src/log.h
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F src/wal.c f93ce8968d6e86378aa2d465f592027e02929a7a
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F src/wal.h 1a34bb71642b46af5e6d51c2f69ae0f55268df81
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F src/walker.c 3112bb3afe1d85dc52317cb1d752055e9a781f8f
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F src/where.c faadd9c2bf08868e5135192b44e0d753e363a885
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F test/aggerror.test a867e273ef9e3d7919f03ef4f0e8c0d2767944f2
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@ -761,13 +758,13 @@ F test/vtabE.test 7c4693638d7797ce2eda17af74292b97e705cc61
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F test/vtab_alter.test 9e374885248f69e251bdaacf480b04a197f125e5
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F test/vtab_err.test 0d4d8eb4def1d053ac7c5050df3024fd47a3fbd8
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F test/vtab_shared.test 0eff9ce4f19facbe0a3e693f6c14b80711a4222d
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F test/wal.test 8dcfd1ce874aead6199fa715ba8e35cfbb3ef766
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F test/wal.test 7d44c2ee327e86a7c26052795789dd2d472bd1d4
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F test/walbak.test f6fde9a5f59d0c697cb1f4af7876178c2f69a7ba
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F test/walcrash.test f022cee7eb7baa5fb898726120a6a4073dd831d1
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F test/walhook.test 76a559e262f0715c470bade4a8d8333035f8ee47
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F test/walmode.test c2f4e30ad64910b2d8faf6cf4e940b3f201b41df
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F test/walslow.test 38076d5fad49e3678027be0f8110e6a32d531dc2
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F test/walthread.test 27e44ee6fd02f1f494a24f999c97086af3ab739d
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F test/walthread.test a7962d8b899366cc71f8381d9aeab8ae9e1b544d
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F test/where.test de337a3fe0a459ec7c93db16a519657a90552330
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F test/where2.test 45eacc126aabb37959a387aa83e59ce1f1f03820
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F test/where3.test aa44a9b29e8c9f3d7bb94a3bb3a95b31627d520d
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@ -811,14 +808,7 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
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F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
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F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
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F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
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P f5e615c28c7035a7e6d896790b51cf9bc7371d5f
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R 993bceae438ad1d8ab0904d8daf11104
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U drh
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Z e29cadabf74dbcaa3b3703c56732da89
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P 56fe5d7624f840417152bcc63efbe21a5f557920
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R 262915592f11e9609982ee307c6e8694
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U dan
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Z 883881034efc398d53801b8849d7e631
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@ -1 +1 @@
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56fe5d7624f840417152bcc63efbe21a5f557920
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3d159939cc2beb18c4ca0c8e9a99a75d4107e6e4
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@ -5113,6 +5113,7 @@ int Sqlitetest1_Init(Tcl_Interp *interp){
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#ifdef SQLITE_TEST
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extern char sqlite3_query_plan[];
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static char *query_plan = sqlite3_query_plan;
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extern int sqlite3_walsummary_mmap_incr; /* In wal.c */
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#ifdef SQLITE_ENABLE_FTS3
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extern int sqlite3_fts3_enable_parentheses;
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#endif
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@ -5172,6 +5173,8 @@ int Sqlitetest1_Init(Tcl_Interp *interp){
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#ifdef SQLITE_TEST
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Tcl_LinkVar(interp, "sqlite_query_plan",
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(char*)&query_plan, TCL_LINK_STRING|TCL_LINK_READ_ONLY);
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Tcl_LinkVar(interp, "sqlite_walsummary_mmap_incr",
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(char*)&sqlite3_walsummary_mmap_incr, TCL_LINK_INT);
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#endif
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#ifdef SQLITE_DEBUG
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Tcl_LinkVar(interp, "sqlite_addop_trace",
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28
src/wal.c
28
src/wal.c
@ -119,7 +119,12 @@ struct LogSummaryHdr {
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** A 64 KB log-summary mapping corresponds to a log file containing over
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** 13000 frames, so the mapping size does not need to be increased often.
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*/
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#ifdef SQLITE_TEST
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int sqlite3_walsummary_mmap_incr = 128;
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# define LOGSUMMARY_MMAP_INCREMENT sqlite3_walsummary_mmap_incr
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#else
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# define LOGSUMMARY_MMAP_INCREMENT (64*1024)
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#endif
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/*
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** There is one instance of this structure for each log-summary object
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@ -611,9 +616,10 @@ static int logSummaryEntry(u32 iFrame){
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static void logSummaryAppend(LogSummary *pSummary, u32 iFrame, u32 iPage){
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u32 iSlot = logSummaryEntry(iFrame);
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if( (iSlot+128)>=pSummary->nData ){
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while( (iSlot+128)>=pSummary->nData ){
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int nByte = pSummary->nData*4 + LOGSUMMARY_MMAP_INCREMENT;
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/* Unmap and remap the log-summary file. */
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sqlite3_mutex_enter(pSummary->mutex);
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munmap(pSummary->aData, pSummary->nData*4);
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pSummary->aData = 0;
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@ -1377,8 +1383,11 @@ int logSummaryTryHdr(Log *pLog, int *pChanged){
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u32 aCksum[2] = {1, 1};
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u32 aHdr[LOGSUMMARY_HDR_NFIELD+2];
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/* First try to read the header without a lock. Verify the checksum
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** before returning. This will almost always work.
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/* Read the header. The caller may or may not have locked the log-summary
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** file, meaning it is possible that an inconsistent snapshot is read
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** from the file. If this happens, return SQLITE_ERROR. The caller will
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** retry. Or, if the caller has already locked the file and the header
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** still looks inconsistent, it will run recovery.
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*/
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memcpy(aHdr, pLog->pSummary->aData, sizeof(aHdr));
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logChecksumBytes((u8*)aHdr, sizeof(u32)*LOGSUMMARY_HDR_NFIELD, aCksum);
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@ -1410,10 +1419,16 @@ int logSummaryReadHdr(Log *pLog, int *pChanged){
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/* First try to read the header without a lock. Verify the checksum
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** before returning. This will almost always work.
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**
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** TODO: Doing this causes a race-condition with the code that resizes
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** the mapping. Unless Log.pSummary->mutex is held, it is possible that
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** LogSummary.aData is invalid.
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*/
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#if 0
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if( SQLITE_OK==logSummaryTryHdr(pLog, pChanged) ){
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return SQLITE_OK;
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}
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#endif
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/* If the first attempt to read the header failed, lock the log-summary
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** file and try again. If the header checksum verification fails this
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@ -1502,11 +1517,14 @@ void sqlite3WalCloseSnapshot(Log *pLog){
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*/
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int sqlite3WalRead(Log *pLog, Pgno pgno, int *pInLog, u8 *pOut){
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u32 iRead = 0;
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u32 *aData = pLog->pSummary->aData;
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u32 *aData;
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int iFrame = (pLog->hdr.iLastPg & 0xFFFFFF00);
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assert( pLog->isLocked );
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sqlite3_mutex_enter(pLog->pSummary->mutex);
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aData = pLog->pSummary->aData;
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/* Do a linear search of the unindexed block of page-numbers (if any)
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** at the end of the log-summary. An alternative to this would be to
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** build an index in private memory each time a read transaction is
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@ -1549,6 +1567,8 @@ int sqlite3WalRead(Log *pLog, Pgno pgno, int *pInLog, u8 *pOut){
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}
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assert( iRead==0 || aData[logSummaryEntry(iRead)]==pgno );
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sqlite3_mutex_leave(pLog->pSummary->mutex);
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/* If iRead is non-zero, then it is the log frame number that contains the
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** required page. Read and return data from the log file.
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*/
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@ -787,8 +787,9 @@ do_test wal-13.5 {
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execsql { SELECT count(*) FROM t2 }
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} [expr int(pow(2, 15))]
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do_test wal-13.6 {
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file size test.db-wal-summary
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} [expr 192*1024]
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set sz [file size test.db-wal-summary]
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expr {$sz<=(3*64*1024) && $sz>(2*64*1024)}
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} {1}
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finish_test
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@ -10,7 +10,7 @@
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#***********************************************************************
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# This file implements regression tests for SQLite library. The
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# focus of this file is testing the operation of the library in
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# "PRAGMA journal_mode=WAL" mode.
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# "PRAGMA journal_mode=WAL" mode with multiple threads.
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#
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set testdir [file dirname $argv0]
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@ -18,6 +18,11 @@ set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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if {[run_thread_tests]==0} { finish_test ; return }
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set sqlite_walsummary_mmap_incr 64
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#--------------------------------------------------------------------------
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# Initialize the database used for the multi-thread test.
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#
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do_test walthread-1.1 {
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execsql {
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PRAGMA journal_mode = WAL;
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@ -69,7 +74,6 @@ do_test walthread-1.4 {
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# 1) Execute "CHECKPOINT main 32 -1 1"
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# 2) Sleep for 500 ms.
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#
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set thread_program {
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proc rest {ms} {
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set ::rest 0
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