Description of problem: After upgrading from erlang-R16B-03.11 to erlang-R16B-03.13 epmd has started crashing at start up in some of our machines. Version-Release number of selected component (if applicable): erlang-R16B-03.13 How reproducible: Start epmd daemon in a machine without ipv6 address Steps to Reproduce: [root@myhost ~]# epmd -debug epmd: Wed Feb 17 08:27:23 2016: epmd running - daemon = 0 *** buffer overflow detected ***: epmd terminated ======= Backtrace: ========= /lib64/libc.so.6(__fortify_fail+0x37)[0x7f01fe269ac7] /lib64/libc.so.6(+0x10bc80)[0x7f01fe267c80] /lib64/libc.so.6(+0x10da37)[0x7f01fe269a37] epmd[0x403a96] epmd[0x401915] /lib64/libc.so.6(__libc_start_main+0xf5)[0x7f01fe17db15] epmd[0x401d0d] ======= Memory map: ======== 00400000-0040c000 r-xp 00000000 fd:00 34108967 /usr/lib64/erlang/erts-5.10.4/bin/epmd 0060b000-0060c000 r--p 0000b000 fd:00 34108967 /usr/lib64/erlang/erts-5.10.4/bin/epmd 0060c000-0060d000 rw-p 0000c000 fd:00 34108967 /usr/lib64/erlang/erts-5.10.4/bin/epmd 0149f000-014c0000 rw-p 00000000 00:00 0 [heap] 7f01fcc70000-7f01fcc85000 r-xp 00000000 fd:00 50663 /usr/lib64/libz.so.1.2.7 7f01fcc85000-7f01fce84000 ---p 00015000 fd:00 50663 /usr/lib64/libz.so.1.2.7 7f01fce84000-7f01fce85000 r--p 00014000 fd:00 50663 /usr/lib64/libz.so.1.2.7 7f01fce85000-7f01fce86000 rw-p 00015000 fd:00 50663 /usr/lib64/libz.so.1.2.7 7f01fce86000-7f01fce95000 r-xp 00000000 fd:00 66728 /usr/lib64/libbz2.so.1.0.6 7f01fce95000-7f01fd094000 ---p 0000f000 fd:00 66728 /usr/lib64/libbz2.so.1.0.6 7f01fd094000-7f01fd095000 r--p 0000e000 fd:00 66728 /usr/lib64/libbz2.so.1.0.6 7f01fd095000-7f01fd096000 rw-p 0000f000 fd:00 66728 /usr/lib64/libbz2.so.1.0.6 7f01fd096000-7f01fd0ba000 r-xp 00000000 fd:00 16885 /usr/lib64/liblzma.so.5.0.99 7f01fd0ba000-7f01fd2b9000 ---p 00024000 fd:00 16885 /usr/lib64/liblzma.so.5.0.99 7f01fd2b9000-7f01fd2ba000 r--p 00023000 fd:00 16885 /usr/lib64/liblzma.so.5.0.99 7f01fd2ba000-7f01fd2bb000 rw-p 00024000 fd:00 16885 /usr/lib64/liblzma.so.5.0.99 7f01fd2bb000-7f01fd2d0000 r-xp 00000000 fd:00 66743 /usr/lib64/libelf-0.163.so 7f01fd2d0000-7f01fd4cf000 ---p 00015000 fd:00 66743 /usr/lib64/libelf-0.163.so 7f01fd4cf000-7f01fd4d0000 r--p 00014000 fd:00 66743 /usr/lib64/libelf-0.163.so 7f01fd4d0000-7f01fd4d1000 rw-p 00015000 fd:00 66743 /usr/lib64/libelf-0.163.so 7f01fd4d1000-7f01fd4d5000 r-xp 00000000 fd:00 66753 /usr/lib64/libattr.so.1.1.0 7f01fd4d5000-7f01fd6d4000 ---p 00004000 fd:00 66753 /usr/lib64/libattr.so.1.1.0 7f01fd6d4000-7f01fd6d5000 r--p 00003000 fd:00 66753 /usr/lib64/libattr.so.1.1.0 7f01fd6d5000-7f01fd6d6000 rw-p 00004000 fd:00 66753 /usr/lib64/libattr.so.1.1.0 7f01fd6d6000-7f01fd6ec000 r-xp 00000000 fd:00 16866 /usr/lib64/libpthread-2.17.so 7f01fd6ec000-7f01fd8ec000 ---p 00016000 fd:00 16866 /usr/lib64/libpthread-2.17.so 7f01fd8ec000-7f01fd8ed000 r--p 00016000 fd:00 16866 /usr/lib64/libpthread-2.17.so 7f01fd8ed000-7f01fd8ee000 rw-p 00017000 fd:00 16866 /usr/lib64/libpthread-2.17.so 7f01fd8ee000-7f01fd8f2000 rw-p 00000000 00:00 0 7f01fd8f2000-7f01fd907000 r-xp 00000000 fd:00 142 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 7f01fd907000-7f01fdb06000 ---p 00015000 fd:00 142 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 7f01fdb06000-7f01fdb07000 r--p 00014000 fd:00 142 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 7f01fdb07000-7f01fdb08000 rw-p 00015000 fd:00 142 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 7f01fdb08000-7f01fdb4d000 r-xp 00000000 fd:00 82543 /usr/lib64/libdw-0.163.so 7f01fdb4d000-7f01fdd4c000 ---p 00045000 fd:00 82543 /usr/lib64/libdw-0.163.so 7f01fdd4c000-7f01fdd4e000 r--p 00044000 fd:00 82543 /usr/lib64/libdw-0.163.so 7f01fdd4e000-7f01fdd4f000 rw-p 00046000 fd:00 82543 /usr/lib64/libdw-0.163.so 7f01fdd4f000-7f01fdd53000 r-xp 00000000 fd:00 66757 /usr/lib64/libcap.so.2.22 7f01fdd53000-7f01fdf52000 ---p 00004000 fd:00 66757 /usr/lib64/libcap.so.2.22 7f01fdf52000-7f01fdf53000 r--p 00003000 fd:00 66757 /usr/lib64/libcap.so.2.22 7f01fdf53000-7f01fdf54000 rw-p 00004000 fd:00 66757 /usr/lib64/libcap.so.2.22 7f01fdf54000-7f01fdf5b000 r-xp 00000000 fd:00 16870 /usr/lib64/librt-2.17.so 7f01fdf5b000-7f01fe15a000 ---p 00007000 fd:00 16870 /usr/lib64/librt-2.17.so 7f01fe15a000-7f01fe15b000 r--p 00006000 fd:00 16870 /usr/lib64/librt-2.17.so 7f01fe15b000-7f01fe15c000 rw-p 00007000 fd:00 16870 /usr/lib64/librt-2.17.so 7f01fe15c000-7f01fe312000 r-xp 00000000 fd:00 16840 /usr/lib64/libc-2.17.so 7f01fe312000-7f01fe512000 ---p 001b6000 fd:00 16840 /usr/lib64/libc-2.17.so 7f01fe512000-7f01fe516000 r--p 001b6000 fd:00 16840 /usr/lib64/libc-2.17.so 7f01fe516000-7f01fe518000 rw-p 001ba000 fd:00 16840 /usr/lib64/libc-2.17.so 7f01fe518000-7f01fe51d000 rw-p 00000000 00:00 0 7f01fe51d000-7f01fe61e000 r-xp 00000000 fd:00 16848 /usr/lib64/libm-2.17.so 7f01fe61e000-7f01fe81d000 ---p 00101000 fd:00 16848 /usr/lib64/libm-2.17.so 7f01fe81d000-7f01fe81e000 r--p 00100000 fd:00 16848 /usr/lib64/libm-2.17.so 7f01fe81e000-7f01fe81f000 rw-p 00101000 fd:00 16848 /usr/lib64/libm-2.17.so 7f01fe81f000-7f01fe822000 r-xp 00000000 fd:00 16846 /usr/lib64/libdl-2.17.so 7f01fe822000-7f01fea21000 ---p 00003000 fd:00 16846 /usr/lib64/libdl-2.17.so 7f01fea21000-7f01fea22000 r--p 00002000 fd:00 16846 /usr/lib64/libdl-2.17.so 7f01fea22000-7f01fea23000 rw-p 00003000 fd:00 16846 /usr/lib64/libdl-2.17.so 7f01fea23000-7f01fea25000 r-xp 00000000 fd:00 16874 /usr/lib64/libutil-2.17.so 7f01fea25000-7f01fec24000 ---p 00002000 fd:00 16874 /usr/lib64/libutil-2.17.so 7f01fec24000-7f01fec25000 r--p 00001000 fd:00 16874 /usr/lib64/libutil-2.17.soAborted (core dumped) Actual results: epmd crashes Expected results: epmd daemon starts Additional info: strace shows that before the crash: bind(3, {sa_family=AF_INET, sin_port=htons(4369), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 listen(3, 128) = 0 socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = -1 EAFNOSUPPORT (Address family not supported by protocol) select(4, [3], NULL, NULL, {5, 0}) = 0 (Timeout) open("/dev/tty", O_RDWR|O_NOCTTY|O_NONBLOCK) = 4 writev(4, [{"*** ", 4}, {"buffer overflow detected", 24}, {" ***: ", 6}, {"epmd", 4}, {" terminated\n", 12}], 5*** buffer overflow detected ***: epmd terminated ) = 50 systemctl start epmd.0.0 works fine.
Can you attach the core dump? Merely starting epmd on a host with no IPv6 addresses doesn't seem to be enough to trigger the bug, I'm unable to reproduce: [root@centos7 ~]# rpm -q erlang-erts erlang-erts-R16B-03.13.el7.x86_64 [root@centos7 ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 52:54:00:87:2d:f5 brd ff:ff:ff:ff:ff:ff inet 192.168.122.147/24 brd 192.168.122.255 scope global dynamic eth0 valid_lft 2850sec preferred_lft 2850sec [root@centos7 ~]# epmd -debug epmd: Mon Feb 22 14:27:20 2016: epmd running - daemon = 0 (no crash for me)
Created attachment 1129626 [details] Core dump file
I have IPv6 support disabled: [root@myhost tmp]# cat /proc/net/if_inet6 cat: /proc/net/if_inet6: No such file or directory [root@myhost tmp]# modprobe -c| grep ipv6 options ipv6 disable=1
Ok, if I disable IPv6 completely in the kernel, then this reproduces 100% of the time for me as well. Digging more into it now.
erlang-R16B-03.16.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2016-a4b860700b
Raúl, please try this build - it should fix this issue.
erlang-R16B-03.16.el7 has been pushed to the Fedora EPEL 7 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2016-a4b860700b
(In reply to Peter Lemenkov from comment #6) > Raúl, please try this build - it should fix this issue. Thank you very much, issue is fixed in erlang-R16B-03.16.el7
*** Bug 1313927 has been marked as a duplicate of this bug. ***
erlang-R16B-03.16.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.