From eab49954002c26bab4bffd344c1fd82d8f524f6e Mon Sep 17 00:00:00 2001 From: Mark Hatle Date: Sat, 29 Sep 2012 19:19:18 -0500 Subject: rpm: Implement workaround for DB_BUFFER_SMALL error In certain cases with BerkleyDB 5.3.x we are getting the error: db3.c:1443: dbcursor->pget(-30999): BDB0063 DB_BUFFER_SMALL: User memory too small fo See https://bugs.launchpad.net/rpm/+bug/934420 for more information. It appears to be some type of a bug in the BerkleyDB 5.3.x. In an attempt to workaround the problem, when we encounter this situation we attempt to adjust the size of the mmap buffer until the call works, or we end up trying 10 times. The new size is either the updated vp->size from the failed pget call, or the previous size + 1024. If DBI debugging is enabled, additional diagnostics are printed, otherwise a basic retry and success message is added to show that the failure was resolved. (From OE-Core rev: bfb2906206158748d0be33baf7984cf885756da1) Signed-off-by: Mark Hatle Signed-off-by: Richard Purdie --- .../rpm/rpm/rpm-db_buffer_small.patch | 77 ++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 meta/recipes-devtools/rpm/rpm/rpm-db_buffer_small.patch (limited to 'meta/recipes-devtools/rpm/rpm/rpm-db_buffer_small.patch') diff --git a/meta/recipes-devtools/rpm/rpm/rpm-db_buffer_small.patch b/meta/recipes-devtools/rpm/rpm/rpm-db_buffer_small.patch new file mode 100644 index 0000000000..d2ed8534f3 --- /dev/null +++ b/meta/recipes-devtools/rpm/rpm/rpm-db_buffer_small.patch @@ -0,0 +1,77 @@ +In certain cases with BerkleyDB 5.3.x we are getting the error: + +db3.c:1443: dbcursor->pget(-30999): BDB0063 DB_BUFFER_SMALL: User memory too small for return value + +See https://bugs.launchpad.net/rpm/+bug/934420 for more information. + +It appears to be some type of a bug in the BerkleyDB 5.3.x. In an attempt +to workaround the problem, when we encounter this situation we attempt +to adjust the size of the mmap buffer until the call works, or we +end up trying 10 times. The new size is either the updated vp->size +from the failed pget call, or the previous size + 1024. + +If DBI debugging is enabled, additional diagnostics are printed, otherwise +a basic retry and success message is added to show that the failure was +resolved. + +Upstream-status: Inappropriate (workaround) + +Signed-off-by: Mark Hatle + +Index: rpm-5.4.9/rpmdb/rpmdb.c +=================================================================== +--- rpm-5.4.9.orig/rpmdb/rpmdb.c ++++ rpm-5.4.9/rpmdb/rpmdb.c +@@ -2212,8 +2212,12 @@ static int rpmmiGet(dbiIndex dbi, DBC * + vp->flags |= DB_DBT_USERMEM; + rc = dbiGet(dbi, dbcursor, kp, vp, flags); + if (rc == DB_BUFFER_SMALL) { ++ int retry = 0; ++ size_t origlen = vp->size; + size_t uhlen = vp->size; +- void * uh = mmap(NULL, uhlen, _prot, _flags, _fdno, _off); ++ void * uh; ++retry_get: ++ uh = mmap(NULL, uhlen, _prot, _flags, _fdno, _off); + if (uh == NULL || uh == (void *)-1) + fprintf(stderr, + "==> mmap(%p[%u], 0x%x, 0x%x, %d, 0x%x) error(%d): %s\n", +@@ -2235,6 +2239,25 @@ static int rpmmiGet(dbiIndex dbi, DBC * + if (munmap(uh, uhlen) != 0) + fprintf(stderr, "==> munmap(%p[%u]) error(%d): %s\n", + uh, (unsigned)uhlen, errno, strerror(errno)); ++ /* We want to be sure to limit the number of retry attempts to avoid a loop! */ ++ if (rc == DB_BUFFER_SMALL && retry < 10) { ++ /* If we got a largr vp-size back, use that, otherwise increment the size by 1k */ ++ uhlen = vp->size > uhlen ? vp->size : uhlen + 1024; ++ retry++; ++ if ((dbi)->dbi_debug) ++ fprintf(stderr, "==> DB_BUFFER_SMALL orig requested (%d), configured (%d), forcing larger buffer (%d), new size (%d)\n", ++ origlen, vp->ulen, uhlen, vp->size); ++ else ++ fprintf(stderr, "==> retry (%d) db3cpget (%d)\n", retry, uhlen); ++ goto retry_get; ++ } ++ } ++ if (retry) { ++ if ((dbi)->dbi_debug) ++ fprintf(stderr, "==> success orig requested (%d), configured buffer (%d), buffer (%d), size after dbiGet (%d)\n", ++ origlen, vp->ulen, uhlen, vp->size); ++ else ++ fprintf(stderr, "==> success\n"); + } + } + } else +Index: rpm-5.4.9/rpmdb/db3.c +=================================================================== +--- rpm-5.4.9.orig/rpmdb/db3.c ++++ rpm-5.4.9/rpmdb/db3.c +@@ -1452,7 +1452,7 @@ assert(db != NULL); + #endif + } + +-DBIDEBUG(dbi, (stderr, "<-- %s(%p,%p,%p,%p,%p,0x%x) rc %d %s%s\n", __FUNCTION__, dbi, dbcursor, key, pkey, data, flags, rc, _DBCFLAGS(flags), _KEYDATA(key, pkey, data, NULL))); ++DBIDEBUG(dbi, (stderr, "<-- %s(%p,%p,%p,%p,%p,0x%x) rc %d %s%s\n", __FUNCTION__, dbi, dbcursor, key, pkey, data, flags, rc, _DBCFLAGS(flags), _KEYDATA(key, pkey, rc == DB_BUFFER_SMALL ? NULL : data, NULL))); + return rc; + } + /*@=mustmod@*/ -- cgit v1.2.3-54-g00ecf