dhcpcd-discuss

Hi

On 01/07/17 09:49, LE GARREC Vincent wrote:
> 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"

I can't replicate this on the head of the master branch?
Can you try that please?
If you still have the core dump and matching binary that made it, I'd 
like that too please!

Roy