Some errors reported by valgrind

Hi,

I have some errors reported by valgrind that may or may not be related to
some strange behaviour with my crawler. Here is the output from valgrind:

==299487== Memcheck, a memory error detector
==299487== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==299487== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright
info
==299487== Command: ./a.out
==299487== Parent PID: 2591
==299487==
==299487== Warning: ignored attempt to set SIGKILL handler in sigaction();
==299487== the SIGKILL signal is uncatchable
==299487== Syscall param epoll_ctl(event) points to uninitialised byte(s)
==299487== at 0x515AACE: epoll_ctl (syscall-template.S:78)
==299487== by 0x10CE05: crawler_init (crawler.c:935)
==299487== by 0x10D89B: main (crawler.c:1155)
==299487== Address 0x1ffefe28ac is on thread 1's stack
==299487== in frame #1, created by crawler_init (crawler.c:904)
==299487==
==299487== Syscall param epoll_ctl(event) points to uninitialised byte(s)
==299487== at 0x515AACE: epoll_ctl (syscall-template.S:78)
==299487== by 0x10C3CF: setsock (crawler.c:717)
==299487== by 0x10C46F: addsock (crawler.c:730)
==299487== by 0x10CC23: sock_cb (crawler.c:869)
==299487== by 0x48B70B1: singlesocket (multi.c:2593)
==299487== by 0x48B7878: multi_socket (multi.c:2839)
==299487== by 0x48B8053: curl_multi_socket_action (multi.c:2956)
==299487== by 0x10C29B: timer_cb (crawler.c:689)
==299487== by 0x10D57A: crawler_init (crawler.c:1100)
==299487== by 0x10D89B: main (crawler.c:1155)
==299487== Address 0x1ffefe2584 is on thread 1's stack
==299487== in frame #1, created by setsock (crawler.c:697)
==299487==
==299487== Syscall param epoll_ctl(event) points to uninitialised byte(s)
==299487== at 0x515AACE: epoll_ctl (syscall-template.S:78)
==299487== by 0x10C3CF: setsock (crawler.c:717)
==299487== by 0x10CC42: sock_cb (crawler.c:871)
==299487== by 0x48B70B1: singlesocket (multi.c:2593)
==299487== by 0x48B7878: multi_socket (multi.c:2839)
==299487== by 0x48B8053: curl_multi_socket_action (multi.c:2956)
==299487== by 0x10C16D: event_cb (crawler.c:651)
==299487== by 0x10D5DB: crawler_init (crawler.c:1102)
==299487== by 0x10D89B: main (crawler.c:1155)
==299487== Address 0x1ffefe25a4 is on thread 1's stack
==299487== in frame #1, created by setsock (crawler.c:697)
==299487==
==299487==
==299487== HEAP SUMMARY:
==299487== in use at exit: 21,583,789 bytes in 21,740 blocks
==299487== total heap usage: 1,166,605 allocs, 1,144,865 frees,
1,474,268,994 bytes allocated
==299487==
==299487== LEAK SUMMARY:
==299487== definitely lost: 5,015,901 bytes in 19,165 blocks
==299487== indirectly lost: 0 bytes in 0 blocks
==299487== possibly lost: 138,910 bytes in 30 blocks
==299487== still reachable: 16,428,978 bytes in 2,545 blocks
==299487== suppressed: 0 bytes in 0 blocks
==299487== Rerun with --leak-check=full to see details of leaked memory
==299487==
==299487== Use --track-origins=yes to see where uninitialised values come
from
==299487== ERROR SUMMARY: 294 errors from 3 contexts (suppressed: 0 from 0)
==299487==
==299487== 1 errors in context 1 of 3:
==299487== Syscall param epoll_ctl(event) points to uninitialised byte(s)
==299487== at 0x515AACE: epoll_ctl (syscall-template.S:78)
==299487== by 0x10CE05: crawler_init (crawler.c:935)
==299487== by 0x10D89B: main (crawler.c:1155)
==299487== Address 0x1ffefe28ac is on thread 1's stack
==299487== in frame #1, created by crawler_init (crawler.c:904)
==299487==
==299487==
==299487== 59 errors in context 2 of 3:
==299487== Syscall param epoll_ctl(event) points to uninitialised byte(s)
==299487== at 0x515AACE: epoll_ctl (syscall-template.S:78)
==299487== by 0x10C3CF: setsock (crawler.c:717)
==299487== by 0x10CC42: sock_cb (crawler.c:871)
==299487== by 0x48B70B1: singlesocket (multi.c:2593)
==299487== by 0x48B7878: multi_socket (multi.c:2839)
==299487== by 0x48B8053: curl_multi_socket_action (multi.c:2956)
==299487== by 0x10C16D: event_cb (crawler.c:651)
==299487== by 0x10D5DB: crawler_init (crawler.c:1102)
==299487== by 0x10D89B: main (crawler.c:1155)
==299487== Address 0x1ffefe25a4 is on thread 1's stack
==299487== in frame #1, created by setsock (crawler.c:697)
==299487==
==299487==
==299487== 234 errors in context 3 of 3:
==299487== Syscall param epoll_ctl(event) points to uninitialised byte(s)
==299487== at 0x515AACE: epoll_ctl (syscall-template.S:78)
==299487== by 0x10C3CF: setsock (crawler.c:717)
==299487== by 0x10C46F: addsock (crawler.c:730)
==299487== by 0x10CC23: sock_cb (crawler.c:869)
==299487== by 0x48B70B1: singlesocket (multi.c:2593)
==299487== by 0x48B7878: multi_socket (multi.c:2839)
==299487== by 0x48B8053: curl_multi_socket_action (multi.c:2956)
==299487== by 0x10C29B: timer_cb (crawler.c:689)
==299487== by 0x10D57A: crawler_init (crawler.c:1100)
==299487== by 0x10D89B: main (crawler.c:1155)
==299487== Address 0x1ffefe2584 is on thread 1's stack
==299487== in frame #1, created by setsock (crawler.c:697)
==299487==
==299487== ERROR SUMMARY: 294 errors from 3 contexts (suppressed: 0 from 0)

If interested the current code for the crawler is at
https://github.com/JamesRead5737/webcrawler

Thanks for any help with understanding these errors.

James Read

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Received on 2020-06-05