elfutils: respin with 404-latch fix for reused debuginfod_client objects
This commit is contained in:
Frank Ch. Eigler
parent
b603536212
commit
8beea897ae
297
elfutils-0.184-pr27859.patch
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297
elfutils-0.184-pr27859.patch
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@ -0,0 +1,297 @@
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commit 1cfd294392762d2707f65ed3c5339cc364f47f1e (HEAD -> rawhide)
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Author: Frank Ch. Eigler <fche@redhat.com>
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Date: Fri May 14 18:37:30 2021 -0400
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PR27859: correct 404-latch bug in debuginfod client reuse
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PR27701 implemented curl handle reuse in debuginfod_client objects,
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but with an unexpected bug. Server responses returning an error
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"latched" because the curl_easy handles for error cases weren't all
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systematically removed from the curl multi handle. This prevented
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their proper re-addition the next time.
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This version of the code simplfies matters by making only the curl
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curl_multi handle long-lived. This turns out to be enough, because it
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can maintain a pool of long-lived http/https connections and related
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data, and lend them out to short-lived curl_easy handles. This mode
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handles errors or hung downloads even better, because the easy handles
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don't undergo complex state transitions between reuse.
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A new test case confirms this correction via the federating debuginfod
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instance (cleaning caches between subtests to make sure http* is being
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used and reused).
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Signed-off-by: Frank Ch. Eigler <fche@redhat.com>
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diff --git a/debuginfod/ChangeLog b/debuginfod/ChangeLog
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index 97f598f6287f..18e2361ffc5e 100644
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--- a/debuginfod/ChangeLog
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+++ b/debuginfod/ChangeLog
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@@ -1,3 +1,11 @@
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+2021-05-14 Frank Ch. Eigler <fche@redhat.com>
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+
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+ PR27859
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+ * debuginfod-client.c (debuginfod_client): Retain only
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+ long-lived multi handle from PR27701 work.
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+ (debuginfo_begin,debuginfod_end): ctor/dtor for surviving field only.
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+ (debuginfod_query_server): Rework to reuse multi handle only.
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+
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2021-05-04 Alice Zhang <alizhang@redhat.com>
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* debuginfod-client.c (cache_miss_default_s): New static time_t,
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diff --git a/debuginfod/debuginfod-client.c b/debuginfod/debuginfod-client.c
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index 4fa047f5efdb..432d0cfef0ca 100644
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--- a/debuginfod/debuginfod-client.c
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+++ b/debuginfod/debuginfod-client.c
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@@ -119,9 +119,8 @@ struct debuginfod_client
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/* File descriptor to output any verbose messages if > 0. */
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int verbose_fd;
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- /* Count DEBUGINFOD_URLS elements and corresponding curl handles. */
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- int num_urls;
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- CURL **server_handles;
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+ /* Maintain a long-lived curl multi-handle, which keeps a
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+ connection/tls/dns cache to recently seen servers. */
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CURLM *server_mhandle;
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/* Can contain all other context, like cache_path, server_urls,
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@@ -541,12 +540,6 @@ debuginfod_query_server (debuginfod_client *c,
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/* Is there any server we can query? If not, don't do any work,
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just return with ENOSYS. Don't even access the cache. */
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- if (c->num_urls == 0)
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- {
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- rc = -ENOSYS;
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- goto out;
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- }
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-
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urls_envvar = getenv(DEBUGINFOD_URLS_ENV_VAR);
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if (vfd >= 0)
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dprintf (vfd, "server urls \"%s\"\n",
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@@ -770,13 +763,20 @@ debuginfod_query_server (debuginfod_client *c,
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goto out0;
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}
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+ /* Count number of URLs. */
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+ int num_urls = 0;
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+ for (int i = 0; server_urls[i] != '\0'; i++)
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+ if (server_urls[i] != url_delim_char
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+ && (i == 0 || server_urls[i - 1] == url_delim_char))
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+ num_urls++;
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+
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CURLM *curlm = c->server_mhandle;
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assert (curlm != NULL);
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/* Tracks which handle should write to fd. Set to the first
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handle that is ready to write the target file to the cache. */
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CURL *target_handle = NULL;
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- struct handle_data *data = malloc(sizeof(struct handle_data) * c->num_urls);
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+ struct handle_data *data = malloc(sizeof(struct handle_data) * num_urls);
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if (data == NULL)
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{
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rc = -ENOMEM;
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@@ -786,7 +786,7 @@ debuginfod_query_server (debuginfod_client *c,
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/* thereafter, goto out1 on error. */
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/* Initialize handle_data with default values. */
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- for (int i = 0; i < c->num_urls; i++)
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+ for (int i = 0; i < num_urls; i++)
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{
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data[i].handle = NULL;
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data[i].fd = -1;
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@@ -797,23 +797,20 @@ debuginfod_query_server (debuginfod_client *c,
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char *server_url = strtok_r(server_urls, url_delim, &strtok_saveptr);
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/* Initialize each handle. */
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- for (int i = 0; i < c->num_urls && server_url != NULL; i++)
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+ for (int i = 0; i < num_urls && server_url != NULL; i++)
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{
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if (vfd >= 0)
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dprintf (vfd, "init server %d %s\n", i, server_url);
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data[i].fd = fd;
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data[i].target_handle = &target_handle;
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- data[i].handle = c->server_handles[i];
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- assert (data[i].handle != NULL);
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- curl_easy_reset(data[i].handle); // esp. previously sent http headers
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- data[i].client = c;
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-
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+ data[i].handle = curl_easy_init();
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if (data[i].handle == NULL)
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{
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rc = -ENETUNREACH;
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goto out1;
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}
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+ data[i].client = c;
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/* Build handle url. Tolerate both http://foo:999 and
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http://foo:999/ forms */
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@@ -869,7 +866,7 @@ debuginfod_query_server (debuginfod_client *c,
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/* Query servers in parallel. */
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if (vfd >= 0)
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- dprintf (vfd, "query %d urls in parallel\n", c->num_urls);
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+ dprintf (vfd, "query %d urls in parallel\n", num_urls);
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int still_running;
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long loops = 0;
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int committed_to = -1;
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@@ -882,7 +879,7 @@ debuginfod_query_server (debuginfod_client *c,
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/* If the target file has been found, abort the other queries. */
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if (target_handle != NULL)
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{
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- for (int i = 0; i < c->num_urls; i++)
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+ for (int i = 0; i < num_urls; i++)
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if (data[i].handle != target_handle)
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curl_multi_remove_handle(curlm, data[i].handle);
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else
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@@ -979,7 +976,7 @@ debuginfod_query_server (debuginfod_client *c,
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curl_easy_strerror (msg->data.result));
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if (pnl)
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c->default_progressfn_printed_p = 0;
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- for (int i = 0; i < c->num_urls; i++)
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+ for (int i = 0; i < num_urls; i++)
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if (msg->easy_handle == data[i].handle)
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{
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if (strlen (data[i].errbuf) > 0)
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@@ -1111,8 +1108,13 @@ debuginfod_query_server (debuginfod_client *c,
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/* Perhaps we need not give up right away; could retry or something ... */
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}
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- curl_multi_remove_handle(curlm, verified_handle);
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- assert (verified_handle == target_handle);
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+ /* remove all handles from multi */
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+ for (int i = 0; i < num_urls; i++)
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+ {
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+ curl_multi_remove_handle(curlm, data[i].handle); /* ok to repeat */
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+ curl_easy_cleanup (data[i].handle);
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+ }
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+
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free (data);
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free (server_urls);
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@@ -1126,6 +1128,13 @@ debuginfod_query_server (debuginfod_client *c,
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/* error exits */
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out1:
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+ /* remove all handles from multi */
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+ for (int i = 0; i < num_urls; i++)
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+ {
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+ curl_multi_remove_handle(curlm, data[i].handle); /* ok to repeat */
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+ curl_easy_cleanup (data[i].handle);
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+ }
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+
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unlink (target_cache_tmppath);
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close (fd); /* before the rmdir, otherwise it'll fail */
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(void) rmdir (target_cache_dir); /* nop if not empty */
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@@ -1174,7 +1183,6 @@ debuginfod_begin (void)
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{
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debuginfod_client *client;
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size_t size = sizeof (struct debuginfod_client);
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- const char* server_urls = NULL;
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client = (debuginfod_client *) calloc (1, size);
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if (client != NULL)
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@@ -1187,45 +1195,15 @@ debuginfod_begin (void)
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client->verbose_fd = -1;
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}
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- /* Count the DEBUGINFOD_URLS and create the long-lived curl handles. */
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- client->num_urls = 0;
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- server_urls = getenv (DEBUGINFOD_URLS_ENV_VAR);
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- if (server_urls != NULL)
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- for (int i = 0; server_urls[i] != '\0'; i++)
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- if (server_urls[i] != url_delim_char
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- && (i == 0 || server_urls[i - 1] == url_delim_char))
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- client->num_urls++;
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-
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- client->server_handles = calloc (client->num_urls, sizeof(CURL *));
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- if (client->server_handles == NULL)
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- goto out1;
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-
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- // allocate N curl easy handles
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- for (int i=0; i<client->num_urls; i++)
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- {
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- client->server_handles[i] = curl_easy_init ();
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- if (client->server_handles[i] == NULL)
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- {
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- for (i--; i >= 0; i--)
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- curl_easy_cleanup (client->server_handles[i]);
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- goto out2;
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- }
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- }
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-
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// allocate 1 curl multi handle
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client->server_mhandle = curl_multi_init ();
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if (client->server_mhandle == NULL)
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- goto out3;
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+ goto out1;
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+
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+ // extra future initialization
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goto out;
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- out3:
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- for (int i=0; i<client->num_urls; i++)
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- curl_easy_cleanup (client->server_handles[i]);
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-
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- out2:
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- free (client->server_handles);
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-
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out1:
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free (client);
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client = NULL;
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@@ -1259,10 +1237,6 @@ debuginfod_end (debuginfod_client *client)
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if (client == NULL)
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return;
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- // assume that all the easy handles have already been removed from the multi handle
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- for (int i=0; i<client->num_urls; i++)
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- curl_easy_cleanup (client->server_handles[i]);
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- free (client->server_handles);
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curl_multi_cleanup (client->server_mhandle);
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curl_slist_free_all (client->headers);
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free (client->url);
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diff --git a/tests/ChangeLog b/tests/ChangeLog
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index 35fb2b2cc2f8..d6691b7702bc 100644
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--- a/tests/ChangeLog
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+++ b/tests/ChangeLog
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@@ -1,3 +1,9 @@
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+2021-05-14 Frank Ch. Eigler <fche@redhat.com>
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+
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+ PR27859
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+ * run-debuginfod-find.sh: Test absence of 404-latch bug in client
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+ curl handle reuse.
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+
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2021-05-04 Alice Zhang <alizhang@redhat.com>
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* run-debuginfod-find.sh: Added tests for negative cache files.
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diff --git a/tests/run-debuginfod-find.sh b/tests/run-debuginfod-find.sh
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index 64b8290a119e..9183cccb7201 100755
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--- a/tests/run-debuginfod-find.sh
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+++ b/tests/run-debuginfod-find.sh
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@@ -559,12 +559,24 @@ curl -s http://127.0.0.1:$PORT1/metrics | grep 'scanned_bytes_total'
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# And generate a few errors into the second debuginfod's logs, for analysis just below
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curl -s http://127.0.0.1:$PORT2/badapi > /dev/null || true
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-curl -s http://127.0.0.1:$PORT2/buildid/deadbeef/debuginfo > /dev/null || true
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+curl -s http://127.0.0.1:$PORT2/buildid/deadbeef/debuginfo > /dev/null || true
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+# NB: this error is used to seed the 404 failure for the survive-404 tests
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# Confirm bad artifact types are rejected without leaving trace
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curl -s http://127.0.0.1:$PORT2/buildid/deadbeef/badtype > /dev/null || true
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(curl -s http://127.0.0.1:$PORT2/metrics | grep 'badtype') && false
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+# Confirm that reused curl connections survive 404 errors.
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+# The rm's force an uncached fetch
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+rm -f $DEBUGINFOD_CACHE_PATH/$BUILDID/debuginfo .client_cache*/$BUILDID/debuginfo
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+testrun ${abs_top_builddir}/debuginfod/debuginfod-find debuginfo $BUILDID
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+rm -f $DEBUGINFOD_CACHE_PATH/$BUILDID/debuginfo .client_cache*/$BUILDID/debuginfo
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+testrun ${abs_top_builddir}/debuginfod/debuginfod-find debuginfo $BUILDID
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+testrun ${abs_top_builddir}/debuginfod/debuginfod-find debuginfo $BUILDID
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+testrun ${abs_top_builddir}/debuginfod/debuginfod-find debuginfo $BUILDID
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+rm -f $DEBUGINFOD_CACHE_PATH/$BUILDID/debuginfo .client_cache*/$BUILDID/debuginfo
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+testrun ${abs_top_builddir}/debuginfod/debuginfod-find debuginfo $BUILDID
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+
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# Confirm that some debuginfod client pools are being used
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curl -s http://127.0.0.1:$PORT2/metrics | grep 'dc_pool_op.*reuse'
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@ -1,6 +1,6 @@
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Name: elfutils
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Name: elfutils
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Version: 0.184
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Version: 0.184
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%global baserelease 4
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%global baserelease 5
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Release: %{baserelease}%{?dist}
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Release: %{baserelease}%{?dist}
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URL: http://elfutils.org/
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URL: http://elfutils.org/
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%global source_url ftp://sourceware.org/pub/elfutils/%{version}/
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%global source_url ftp://sourceware.org/pub/elfutils/%{version}/
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@ -62,6 +62,7 @@ BuildRequires: gettext-devel
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%endif
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%endif
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# Patches
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# Patches
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Patch1: elfutils-0.184-pr27859.patch
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%description
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%description
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Elfutils is a collection of utilities, including stack (to show
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Elfutils is a collection of utilities, including stack (to show
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@ -231,6 +232,7 @@ such servers to download those files on demand.
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%setup -q
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%setup -q
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# Apply patches
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# Apply patches
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%patch1 -p1
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autoreconf -f -v -i
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autoreconf -f -v -i
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||||||
|
|
||||||
@ -407,6 +409,9 @@ exit 0
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%systemd_postun_with_restart debuginfod.service
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%systemd_postun_with_restart debuginfod.service
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%changelog
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%changelog
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||||||
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* Sun May 16 2021 Frank Ch. Eigler <fche@redhat.com> - 0.184-5
|
||||||
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- Fix 404-latch problem on reused debuginfod_client. (PR27859)
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|
|
||||||
* Wed May 12 2021 Frank Ch. Eigler <fche@redhat.com> - 0.184-4
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* Wed May 12 2021 Frank Ch. Eigler <fche@redhat.com> - 0.184-4
|
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- Ship new profile.d files. (1956952)
|
- Ship new profile.d files. (1956952)
|
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|
|
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Reference in New Issue
Block a user