{"action":"created","issue":{"url":"https://api.github.com/repos/zephyrproject-rtos/zephyr/issues/7571","repository_url":"https://api.github.com/repos/zephyrproject-rtos/zephyr","labels_url":"https://api.github.com/repos/zephyrproject-rtos/zephyr/issues/7571/labels{/name}","comments_url":"https://api.github.com/repos/zephyrproject-rtos/zephyr/issues/7571/comments","events_url":"https://api.github.com/repos/zephyrproject-rtos/zephyr/issues/7571/events","html_url":"https://github.com/zephyrproject-rtos/zephyr/issues/7571","id":323531965,"node_id":"MDU6SXNzdWUzMjM1MzE5NjU=","number":7571,"title":"IP stack can't recover from a packet 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connected my Nucleo-F429ZI to a reasonably busy network (i.e. a constant flow of broadcast messages which also end up at the network interface of the MCU) and it very soon ends up receiving more packets than it can handle but the main problem is that even if the load lightens the network application doesn't receive any packets anymore and renders the system useless.\r\n\r\nAfter the first occurrence of this error message the application is dead:\r\n```\r\n[net/buf] [ERR] net_buf_alloc_len_debug: net_pkt_get_reserve_data():359: Failed to get free buffer\r\n```\r\n\r\nI tried increasing buffers and stack but to no avail. Not sure which information I can provide to aid in debugging but it is 100% reproducible (and hence very annoying ;) ):\r\n```\r\nshell> net stats\r\n\r\nGlobal statistics\r\n=================\r\nIPv4 recv      579      sent    12      drop    569     forwarded       0\r\nIP vhlerr      0        hblener 0       lblener 0\r\nIP fragerr     0        chkerr  0       protoer 0\r\nICMP recv      3        sent    5       drop    0\r\nICMP typeer    0        chkerr  0\r\nUDP recv       7        sent    5       drop    450\r\nUDP chkerr     0\r\nBytes received 152255\r\nBytes sent     1237\r\nProcessing err 489\r\nshell> net stats all\r\n\r\nInterface 0x2000a140 (Ethernet) [0]\r\n===================================\r\nIPv4 recv      579      sent    12      drop    569     forwarded       0\r\nIP vhlerr      0        hblener 0       lblener 0\r\nIP fragerr     0        chkerr  0       protoer 0\r\nICMP recv      3        sent    5       drop    0\r\nICMP typeer    0        chkerr  0\r\nUDP recv       7        sent    5       drop    450\r\nUDP chkerr     0\r\nBytes received 152315\r\nBytes sent     1237\r\nProcessing err 490\r\nshell> [net/buf] [ERR] net_buf_alloc_len_debug: net_pkt_get_reserve_data():360: Failed to get free buffer\r\n[net/buf] [ERR] net_buf_alloc_len_debug: net_pkt_get_reserve_data():360: Failed to get free buffer\r\n[net/buf] [ERR] net_buf_alloc_len_debug: net_pkt_get_reserve_data():360: Failed to get free buffer\r\n\r\nshell> net stats\r\n\r\nGlobal statistics\r\n=================\r\nIPv4 recv      2954     sent    12      drop    2944    forwarded       0\r\nIP vhlerr      0        hblener 0       lblener 0\r\nIP fragerr     0        chkerr  0       protoer 0\r\nICMP recv      3        sent    5       drop    0\r\nICMP typeer    0        chkerr  0\r\nUDP recv       7        sent    5       drop    2190\r\nUDP chkerr     0\r\nBytes received 834305\r\nBytes sent     1237\r\nProcessing err 2716\r\n```"},"comment":{"url":"https://api.github.com/repos/zephyrproject-rtos/zephyr/issues/comments/394969712","html_url":"https://github.com/zephyrproject-rtos/zephyr/issues/7571#issuecomment-394969712","issue_url":"https://api.github.com/repos/zephyrproject-rtos/zephyr/issues/7571","id":394969712,"node_id":"MDEyOklzc3VlQ29tbWVudDM5NDk2OTcxMg==","user":{"login":"jukkar","id":1098415,"node_id":"MDQ6VXNlcjEwOTg0MTU=","avatar_url":"https://avatars3.githubusercontent.com/u/1098415?v=4","gravatar_id":"","url":"https://api.github.com/users/jukkar","html_url":"https://github.com/jukkar","followers_url":"https://api.github.com/users/jukkar/followers","following_url":"https://api.github.com/users/jukkar/following{/other_user}","gists_url":"https://api.github.com/users/jukkar/gists{/gist_id}","starred_url":"https://api.github.com/users/jukkar/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jukkar/subscriptions","organizations_url":"https://api.github.com/users/jukkar/orgs","repos_url":"https://api.github.com/users/jukkar/repos","events_url":"https://api.github.com/users/jukkar/events{/privacy}","received_events_url":"https://api.github.com/users/jukkar/received_events","type":"User","site_admin":false},"created_at":"2018-06-06T07:31:47Z","updated_at":"2018-06-06T07:31:47Z","author_association":"MEMBER","body":"We do not know the root cause yet, needs more investigation. Logging enhancements would definitely help with this."}}
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