Merge branch 'jk/http-backend-deadlock-2.2' into jk/http-backend-deadlock-2.3

* jk/http-backend-deadlock-2.2:
http-backend: spool ref negotiation requests to buffer
t5551: factor out tag creation
http-backend: fix die recursion with custom handler

diff --cc t/t5551-http-fetch-smart.sh
index 7f6eb9f3db853d33bd1cfaba06348842f0ea3925,2d8e5a0fbefa4f02c47d529bb8930e0f9e0a3ada..1cca6832904fc237a25c8873675765bfdd2d1506
--- 1/t/t5551-http-fetch-smart.sh
--- 2/t/t5551-http-fetch-smart.sh
+++ b/t/t5551-http-fetch-smart.sh
@@@ -234,6 -236,12 +236,12 @@@ create_tags () 
        # now assign tags to all the dangling commits we created above
        tag=$(perl -e "print \"bla\" x 30") &&
        sed -e "s|^:\([^ ]*\) \(.*\)$|\2 refs/tags/$tag-\1|" <marks >>packed-refs
 -test_expect_success 'create 50,000 tags in the repo' '
+ }
+ 
 -              create_tags 1 50000
++test_expect_success 'create 2,000 tags in the repo' '
+       (
+               cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
++              create_tags 1 2000
        )
  '
  
@@@ -247,12 -253,16 +255,27 @@@ test_expect_success CMDLINE_LIMIT 
        )
  '
  
 +test_expect_success 'large fetch-pack requests can be split across POSTs' '
 +      GIT_CURL_VERBOSE=1 git -c http.postbuffer=65536 \
 +              clone --bare "$HTTPD_URL/smart/repo.git" split.git 2>err &&
 +      grep "^> POST" err >posts &&
 +      test_line_count = 2 posts
 +'
 +
+ test_expect_success EXPENSIVE 'http can handle enormous ref negotiation' '
++      (
++              cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
++              create_tags 2001 50000
++      ) &&
+       git -C too-many-refs fetch -q --tags &&
+       (
+               cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
+               create_tags 50001 100000
+       ) &&
+       git -C too-many-refs fetch -q --tags &&
+       git -C too-many-refs for-each-ref refs/tags >tags &&
+       test_line_count = 100000 tags
+ '
+ 
  stop_httpd
  test_done