This is using glibc 2.7 (the entry box needs to be fixed...) When I use getaddrinfo, valgrind detects a read of size 8 when 'nscd' is not running. When 'nscd' is running, it does not... (In 32-bit mode it is an invalid read of size 4 ... so I bet its a ptr or size_t...) Attached is a source file which demonstrates this problem. Also attached is the 2 valgrind outputs (32 and 64-bit versions). Details: I'm running Gentoo Linux w/ `uname -a`: Linux shiva 2.6.22-ck1 #6 SMP Tue Sep 25 04:53:20 EDT 2007 x86_64 AMD Athlon(tm) 64 X2 Dual Core Processor 6000+ AuthenticAMD GNU/Linux
Created attachment 2141 [details] 64-bit valgrind output
Created attachment 2142 [details] 32-bit valgrind output
Created attachment 2143 [details] src sample which demonstrates the problem
I cannot reproduce any problem, neither in the 2.7 in F8 nor the current mainline glibc. You'll have to debug this yourself. E.g., run with debug information for glibc installed.
No reply in 3 months. If you have the requested information attach it and reopen the bug.
I am also experiencing this with libc 2.7-10ubuntu4 and gcc version 4.2.4 (Ubuntu 4.2.4-1ubuntu3).
I can't reproduce this either. If you can, can you try to reproduce this on glibc-2.10 or the latest glibc mainline? If not, the best course of action I think is to file the bug with your distribution instead.
no further response
Created attachment 7034 [details] Sample code With this sample code valgrind shows errors: ==2394== Syscall param sendmsg(mmsg[0].msg_hdr) points to uninitialised byte(s) ==2394== at 0x41435B6: sendmmsg (in /lib/libc-2.17.so) ==2394== by 0x4625254: __libc_res_nsend (in /lib/libresolv-2.17.so) ==2394== by 0x462292B: __libc_res_nquery (in /lib/libresolv-2.17.so) ==2394== by 0x4622F4C: __libc_res_nquerydomain (in /lib/libresolv-2.17.so) ==2394== by 0x462357B: __libc_res_nsearch (in /lib/libresolv-2.17.so) ==2394== by 0x4617605: _nss_dns_gethostbyname4_r (in /lib/libnss_dns-2.17.so) ==2394== by 0x412631E: gaih_inet (in /lib/libc-2.17.so) ==2394== by 0x41292F2: getaddrinfo (in /lib/libc-2.17.so) ==2394== by 0x8048514: do_real_lookup (in /home/users/pld/C/a.out) ==2394== by 0x804853B: main (in /home/users/pld/C/a.out) I looked at the code and in resolv/res_send.c around line 1115 reqs[0].msg_hdr.msg_flags and reqs[1].msg_hdr.msg_flags are not initialised.
msg_hdr.msg_flags is not used by sendmmsg.