René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"cache: crash on evict","articleBody":"I have some sporadic crashes when using a `revwalk` object. Here is the log:\r\n\r\n```\r\nmalloc: *** error for object ...: pointer being freed was not allocated\r\n\r\n#6. Crashed: NSOperationQueue 0x60000039d3c0 (QOS: USER_INITIATED)\r\n0  libsystem_kernel.dylib         0x7fff5d32a2c6 __pthread_kill + 10\r\n1  libsystem_pthread.dylib        0x7fff5d3dfbf1 pthread_kill + 284\r\n2  libsystem_c.dylib              0x7fff5d2946a6 abort + 127\r\n3  libsystem_malloc.dylib         0x7fff5d3a2aef malloc_vreport + 545\r\n4  libsystem_malloc.dylib         0x7fff5d3a28b0 malloc_report + 151\r\n5  Git                            0x10cce7e0e git_odb_object__free + 30\r\n6  Git                            0x10ccae68e git_commit_list_parse + 814\r\n7  Git                            0x10cd1a614 add_parents_to_list + 100\r\n8  Git                            0x10cd1a10d git_revwalk_next + 333\r\n9  Git                            0x10cd2e6d4 git_smart__negotiate_fetch + 500\r\n10 Git                            0x10ccc51b1 git_fetch_negotiate + 609\r\n11 Git                            0x10cd0fb9a git_remote_download + 1194\r\n12 Git                            0x10cd0fd1a git_remote_fetch + 202\r\n13 Git                            0x10cb8bc4b globalinit_33_46240B7271BAB13E345CE2E50BE21379_func5 + 51947\r\n14 Gitfox                         0x10c95bc53 AsyncOpFetch.execute(txn:) (AsyncOpFetch.swift:69)\r\n```\r\n\r\nUpon looking more closely at `git_commit_list_parse`, I think it could be that\r\n\r\n    git_odb_object *obj;\r\n\r\nis not properly set to `NULL` on initialization.","author":{"url":"https://github.com/eaigner","@type":"Person","name":"eaigner"},"datePublished":"2019-05-22T07:17:16.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":16},"url":"https://github.com/5081/libgit2/issues/5081"}