dhcpcd-discuss

Hi,

I'm using dhcpcd-7.0.0_rc1 and I found a line in my dmesg :

[49260.817999] dhcpcd[496]: segfault at 120 ip 000000000041e7e2 sp
00007ffe6991a880 error 4 in dhcpcd[400000+58000]

I activated dump. The backtrace is below.

In send_netlink, we can see that the context is corrupted.

Tell me if you need more information, I still have the dump.

Best regards,

Vincent

#0  0x000000000041e7e2 in send_netlink (ctx=0x40, ifp=0x0, protocol=0,
hdr=0x7ffe6991a970, callback=0x0) at if-linux.c:832
        priv = 0x44c0b4
        s = 1771153664
        r = 32766
        snl = {nl_family = 16, nl_pad = 0, nl_pid = 0, nl_groups = 0}
        iov = {{iov_base = 0x5800000002, iov_len = 140730669574512}}
        msg = {msg_name = 0x7ffe6991a9d0, msg_namelen = 4241125, msg_iov =
0x7ffe6991aa40, msg_iovlen = 4505780, msg_control = 0x3000000008,
          msg_controllen = 4319830, msg_flags = 1771153696}
#1  0x000000000041ff9a in if_address (cmd=21 '\025', addr=0x67f640) at
if-linux.c:1458
        nlm = {hdr = {nlmsg_len = 32, nlmsg_type = 21, nlmsg_flags = 1,
nlmsg_seq = 0, nlmsg_pid = 0}, ifa = {ifa_family = 2 '\002',
            ifa_prefixlen = 16 '\020', ifa_flags = 0 '\000', ifa_scope = 0
'\000', ifa_index = 6781312},
          buffer = "\b\000\002\000\251\376dž", '\000' <repeats 55 times>}
        retval = 0
#2  0x000000000042b9af in ipv4_deladdr (addr=0x67f640, keeparp=1) at
ipv4.c:467
        r = 0
        state = 0x677980
        ap = 0x600000000
        astate = 0x676a20
        __func__ = "ipv4_deladdr"
#3  0x000000000042f23c in ipv4ll_freedrop (ifp=0x677980, drop=1) at
ipv4ll.c:449
        istate = 0x677800
        state = 0x677880
        dropped = 0
#4  0x0000000000405286 in dhcpcd_drop (ifp=0x677980, stop=0) at dhcpcd.c:369
No locals.
#5  0x0000000000406085 in dhcpcd_handlecarrier (ctx=0x7ffe6991adb0,
carrier=-1, flags=4098, ifname=0x7ffe6991ab60 "enp6s0u2") at dhcpcd.c:724
        ifp = 0x677980
        __func__ = "dhcpcd_handlecarrier"
#6  0x000000000041e71d in link_netlink (ctx=0x7ffe6991adb0, ifp=0x677980,
nlm=0x674700) at if-linux.c:802
        r = 0
        len = 0
        rta = 0x674bec
        hwaddr = 0x6747cc
        ifi = 0x674710
        ifn = "enp6s0u2\000\256\221i\376\177\000", <incomplete sequence
\354>
#7  0x000000000041d8bf in get_netlink (ctx=0x7ffe6991adb0,
iov=0x7ffe6991aea8, ifp=0x0, fd=7, flags=64, callback=0x41e3a6
<link_netlink>) at if-linux.c:397
        msg = {msg_name = 0x7ffe6991abe0, msg_namelen = 12, msg_iov =
0x7ffe6991aea8, msg_iovlen = 1, msg_control = 0x0, msg_controllen = 0,
msg_flags = 0}
        nladdr = {nl_family = 16, nl_pad = 0, nl_pid = 0, nl_groups = 1}
        len = 1260
        nlm = 0x674700
        r = 0
        again = 0
#8  0x000000000041e778 in if_handlelink (ctx=0x7ffe6991adb0) at
if-linux.c:812
No locals.
#9  0x0000000000406a5c in dhcpcd_handlelink (arg=0x7ffe6991adb0) at
dhcpcd.c:972
        ctx = 0x7ffe6991adb0
        __func__ = "dhcpcd_handlelink"
#10 0x000000000040b0d3 in eloop_start (eloop=0x66cbe0,
signals=0x7ffe6991aeb8) at eloop.c:970
        n = 1
        e = 0x66cd20
        t = 0x67f740
        now = {tv_sec = 49250, tv_nsec = 140066081}
        ts = {tv_sec = 52, tv_nsec = 89210088}
        tsp = 0x7ffe6991acf0
        t0 = 0x40a49e <eloop_q_timeout_add_sec+88>
        epe = {events = 1, data = {ptr = 0x66cd20, fd = 6737184, u32 =
6737184, u64 = 6737184}}
        timeout = 52090
#11 0x0000000000409481 in main (argc=2, argv=0x7ffe6991b278) at
dhcpcd.c:1940
        ctx = {pidfile = "/run/dhcpcd.pid", '\000' <repeats 23 times>,
cffile = 0x44843f "/etc/dhcpcd.conf", options = 310326615011679241, logfile
= 0x0,
          argc = 2, argv = 0x7ffe6991b278, ifac = 0, ifav = 0x0, ifdc = 0,
ifdv = 0x0, ifc = 0, ifv = 0x7ffe6991b288, ifcc = 0, ifcv = 0x0,
          duid = 0x67ee40 "", duid_len = 14, ifaces = 0x6719f0, routes =
{tqh_first = 0x676b90, tqh_last = 0x674d10}, kroutes = {tqh_first =
0x676e00,
            tqh_last = 0x6770f0}, froutes = {tqh_first = 0x67f4e0, tqh_last
= 0x67f170}, pf_inet_fd = 9, priv = 0x66cd00, link_fd = 7, seq = 213, sseq
= 213,
          iov = {{iov_base = 0x674700, iov_len = 1536}}, sigset = {__val =
{0 <repeats 16 times>}}, eloop = 0x66cbe0, control_fd = 5,
control_unpriv_fd = 6,
          control_fds = {tqh_first = 0x0, tqh_last = 0x7ffe6991af48},
control_sock = "/run/dhcpcd.sock", '\000' <repeats 20 times>, control_group
= 0,
          vivso = 0x0, vivso_len = 0, randomstate = 0x7fba63f3f100
<randtbl> "\003", ppid = 453, pseq = 8, dhcp_opts = 0x66a730, dhcp_opts_len
= 124,
          udp_fd = 10, opt_buffer = 0x0, opt_buffer_len = 0,
          secret = 0x67f780
"@vE\337\273\023\a\315e8\363\255$ko\207\301\234\250\255q\311\306bd~K\237l\370\024\311#\003\036I8\305O)b?\215\255&q\341\060>\264\352UM\213\356(\277\030E%E\277\366d9:c6:62:64:7e:4b:9f:6c:f8:14:c9:23:03:1e:49:38:c5:4f:29:62:3f:8d:ad:26:71:e1:30:3e:b4:ea:55:4d:8b:ee:28:bf:18:45:25:45:bf:f6:64\n",
secret_len = 64, ctlbuf = '\000' <repeats 63 times>, from = {sin6_family =
0, sin6_port = 0, sin6_flowinfo = 0, sin6_addr = {__in6_u = {
                __u6_addr8 = '\000' <repeats 15 times>, __u6_addr16 = {0,
0, 0, 0, 0, 0, 0, 0}, __u6_addr32 = {0, 0, 0, 0}}}, sin6_scope_id = 0},
sndhdr = {
            msg_name = 0x7ffe6991ac50, msg_namelen = 28, msg_iov =
0x7ffe6991b078, msg_iovlen = 1, msg_control = 0x7ffe6991b088,
msg_controllen = 40,
            msg_flags = 0}, sndiov = {{iov_base = 0x676ab0, iov_len = 16}},
          sndbuf = "$\000\000\000\000\000\000\000)\000\000\000\062", '\000'
<repeats 19 times>, "\016\000\000\000\000\000\000", rcvhdr = {
            msg_name = 0x7ffe6991b020, msg_namelen = 28, msg_iov =
0x7ffe6991aea8, msg_iovlen = 1, msg_control = 0x7ffe6991afe0,
msg_controllen = 0,
            msg_flags = 0}, ntopbuf = '\000' <repeats 45 times>, sfrom =
0x0, nd_fd = 14, ra_routers = 0x67f060, dhcp6_fd = -1, nd_opts = 0x66ca20,
          nd_opts_len = 6, dhcp6_opts = 0x673300, dhcp6_opts_len = 71,
dev_load = 0x0, dev_fd = 11, dev = 0x66df60, dev_handle = 0x66cd60}
        ifo = 0x0
        ifp = 0x0
        family = 0
        opt = 0
        oi = 0
        i = 0
        logopts = 2136192
        t = 30
        len = 140438519751319
        pid = 0
        sig = 0
        siga = 0x0
        __func__ = "main"