Problem with key

[micah anderson]

Every 2 days or so, my entropy key seems to die, segfaults and dumps
core. I need to restart it to get it back. It seems to say something
similar to this each time:

ekeyd[3199]: segfault at 7f6874bf57e0 ip 00007f6d93b5ce46 sp 00007fff2e5d0480 error 6 in liblua5.1.so.0.0.0[7f6d93b55000+2a000]

I noticed other people were having this problem[0] as it has been
reported in a Debian bug log. To try and help I recompiled ekeyd with
debugging symbols, and got a backtrace and posted it to the bug log, but
have not heard anything from the maintainer. I'll include the gdb output
below.

I've tried a different key, and the same result. I wonder if perhaps the
key is overloaded? If so, it seems odd behavior to segfault in that
situation.

Here is the gdb backtrace:

(gdb) thread apply all bt

Thread 1 (process 12066):
#0  0xb7fc71e6 in luaV_gettable (L=0x8064040, t=0x8064088, key=0xbffff040, val=0x8e3d6ffc) at lvm.c:117
#1  0xb7fb8bbc in lua_getfield (L=0x8064040, idx=-10002, k=0x8057de9 "ENTROPY") at lapi.c:551
#2  0x0804a21d in lstate_foldback_entropy (
    eblock=0xbffff180 "\325\064\301\026H\035\362a\022\071\330v\303CTGk\020d\\\277\233\032`\277\003\346\270\b\003\302q\001", ecount=32) at lstate.c:496
#3  0x0804c351 in estream_write (state=0x8082ae8, buf=0xbffff180, count=32) at stream.c:145
#4  0x0804bead in entropy_pkt_handler (state=0x808b6b8, 
    buf=0xbffff180 "\325\064\301\026H\035\362a\022\071\330v\303CTGk\020d\\\277\233\032`\277\003\346\270\b\003\302q\001", count=32) at connection.c:407
#5  0x0804b7d9 in econ_run (con_state=0x808b6b8) at connection.c:605
#6  0x08049ed2 in ekey_fd_activity (fd=8, events=1, pw=0x808b6b8) at ekeyd.c:81
#7  0x0804d1ca in ekeyfd_poll (timeout=-1) at fds.c:99
#8  0x08049b14 in main (argc=1, argv=0xbffff354) at ekeyd.c:279
(gdb) bt full
#0  0xb7fc71e6 in luaV_gettable (L=0x8064040, t=0x8064088, key=0xbffff040, val=0x8e3d6ffc) at lvm.c:117
        res = 0x8081ad4
        tm = 0x8064488
        loop = 0
#1  0xb7fb8bbc in lua_getfield (L=0x8064040, idx=-10002, k=0x8057de9 "ENTROPY") at lapi.c:551
        t = 0x8064088
        key = {value = {gc = 0x8067888, p = 0x8067888, n = 6.6521887874227949e-316, b = 134641800}, tt = 4}
#2  0x0804a21d in lstate_foldback_entropy (
    eblock=0xbffff180 "\325\064\301\026H\035\362a\022\071\330v\303CTGk\020d\\\277\233\032`\277\003\346\270\b\003\302q\001", ecount=32) at lstate.c:496
        L = 0x8064040
#3  0x0804c351 in estream_write (state=0x8082ae8, buf=0xbffff180, count=32) at stream.c:145
        wr = <value optimized out>
#4  0x0804bead in entropy_pkt_handler (state=0x808b6b8, 
    buf=0xbffff180 "\325\064\301\026H\035\362a\022\071\330v\303CTGk\020d\\\277\233\032`\277\003\346\270\b\003\302q\001", count=32) at connection.c:407
        session_state = {h = {hashBitLen = 256, bCnt = 0, T = {8, 13763000461244235776}}, X = {17248407767138219025, 15353654178714778695, 
            14002893104654875124, 6618644036545962442}, b = '\000' <repeats 31 times>}
        seq_num = 2387
        randbuffer_encbytes = "1u`\234\322\f<\r\020\362z\220\037_\357Do>\234\307˵\324&1\220%ۧ\306.", <incomplete sequence \357>
        loop = <value optimized out>
#5  0x0804b7d9 in econ_run (con_state=0x808b6b8) at connection.c:605
        res = 32
        data = "\325\064\301\026H\035\362a\022\071\330v\303CTGk\020d\\\277\233\032`\277\003\346\270\b\003\302q\001\000\000\000\340J\006\b\377\377\377\377\004\213\375\267\360o=\216@@\006\b\330\361\377\277\062\307\373\267@@\006\b\316V\375\267\021\000\000\000\004\213\375\267@@\006\b\004\000\000\000\b\362\377\277\350\315\373\267@@\006\b\004\000\000\000\360o=\216h\264\b\bh\264\b\b\000\000\006\001\000\000\000\000\360o=\216"
#6  0x08049ed2 in ekey_fd_activity (fd=8, events=1, pw=0x808b6b8) at ekeyd.c:81
No locals.
#7  0x0804d1ca in ekeyfd_poll (timeout=-1) at fds.c:99
        rdy = 2
        fdcnt = 1
        fdloop = 2
#8  0x08049b14 in main (argc=1, argv=0xbffff354) at ekeyd.c:279
        res = 134751424
        opt = <value optimized out>
        configfile = 0x8064008 "/etc/entropykey/ekeyd.conf"
        pidfile = 0x8064028 "/var/run/ekeyd.pid"
(gdb) quit


Thanks for any ideas!
micah


-- 

0. http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=639014
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