#462 SV_Netchan_Transmit: unsent fragments, stacked

[nexus024]

Hey guys

I'm hoping someone here can help me figure out why I am getting the above error message. It seems to only happen at the beginning of a new map but doesn't happen all the time.

[^misantropia^]

You have debug logging on. It's a harmless message, the only thing it signals is that the server is trying to send more data than fits in one packet. The surplus will overflow into the next packet.

[nexus024]

The problem is that I see a whole stream of these messages at the end of the log file after a server crash. Are these messages a result of the server crash and not the cause?

[^misantropia^]

The cause? Unlikely. Where exactly does the crash happen? If unsure, tag on a debugger and post the backtrace here.

[nexus024]

Code: Select all

#0  0x0000003053630215 in raise () from /lib64/libc.so.6
#1  0x0000003053631cc0 in abort () from /lib64/libc.so.6
#2  0x0000003053629696 in __assert_fail () from /lib64/libc.so.6
#3  0x0000000000476810 in StringsMatch (pieces=0x2aaaaf9373e8,
    match=0x7fffffffca50) at code/botlib/be_ai_chat.c:1442
#4  0x0000000000476964 in BotFindMatch (
    str=0x7fffffffcd6c "\031(Lost in your eyes\031) (Blue Upper Entrances)\031: I do not have any skills, I just team stack and then spam to groups of people to get a high score and act cool.", match=0x7fffffffca50, context=262)
    at code/botlib/be_ai_chat.c:1475
#5  0x000000000040c70b in SV_GameSystemCalls (args=0x7fffffffc8b0)
    at code/server/sv_game.c:667
#6  0x0000000000449632 in VM_DllSyscall (arg=518) at code/qcommon/vm.c:349
#7  0x00002aaaafff52ac in trap_BotFindMatch (
    str=0x7fffffffcd6c "\031(Lost in your eyes\031) (Blue Upper Entrances)\031: I do not have any skills, I just team stack and then spam to groups of people to get a high score and act cool.", match=0x7fffffffca50, context=262)
    at code/game/g_syscalls.c:555
#8  0x00002aaaaff91301 in BotMatchMessage (bs=0x2aaab022b2e0,
    message=0x7fffffffcd6c "\031(Lost in your eyes\031) (Blue Upper Entrances)\031: I do not have any skills, I just team stack and then spam to groups of people to get a high score and act cool.") at code/game/ai_cmd.c:1808
#9  0x00002aaaaffa569c in BotCheckConsoleMessages (bs=0x2aaab022b2e0)
---Type <return> to continue, or q <return> to quit---
    at code/game/ai_dmq3.c:4636
#10 0x00002aaaaffa66cb in BotDeathmatchAI (bs=0x2aaab022b2e0,
    thinktime=0.100000001) at code/game/ai_dmq3.c:5256
#11 0x00002aaaaffa99e3 in BotAI (client=8, thinktime=0.100000001)
    at code/game/ai_main.c:1043
#12 0x00002aaaaffaaef4 in BotAIStartFrame (time=479498)
    at code/game/ai_main.c:1545
#13 0x00002aaaaff859ef in vmMain (command=10, arg0=479498, arg1=11065408,
    arg2=0, arg3=1572864, arg4=31, arg5=-1338077360, arg6=-8784, arg7=4264202,
    arg8=11054473, arg9=0, arg10=0, arg11=33) at code/game/g_main.c:261
#14 0x000000000044a2d3 in VM_Call (vm=0x896ae0, callnum=10)
    at code/qcommon/vm.c:756
#15 0x000000000040358e in SV_BotFrame (time=479498) at code/server/sv_bot.c:439
#16 0x000000000041110a in SV_Frame (msec=1) at code/server/sv_main.c:939
#17 0x000000000042baf2 in Com_Frame () at code/qcommon/common.c:2910
#18 0x0000000000498768 in main (argc=30, argv=0x7fffffffe338)
    at code/sys/sys_main.c:568

[^misantropia^]

Code: Select all

#3 0x0000000000476810 in StringsMatch (pieces=0x2aaaaf9373e8, match=0x7fffffffca50) at code/botlib/be_ai_chat.c:1442

That's the one. And it's this assert that is failing:

Code: Select all

assert( match->variables[lastvariable].offset >= 0 );

Not exactly sure why. Have you been hacking the bot code?

[nexus024]

Hmmm good question. There was one function I played with a while back. I will go back and change it to stock and see if that fixes it. Thanks ^misantropia^!

[nexus024]

Can you tell from that assert where in the code the problem might be? Is this in some particular function?

[nexus024]

Here is a new one...

Code: Select all

Item: 1 weapon_rocketlauncher
UnnamedPlayer: Delta request from out of date packet.
WARNING: msg overflowed for UnnamedPlayer
UnnamedPlayer: Delta request from out of date packet.
WARNING: msg overflowed for UnnamedPlayer
UnnamedPlayer: Delta request from out of date packet.
WARNING: msg overflowed for UnnamedPlayer
UnnamedPlayer: Delta request from out of date packet.
WARNING: msg overflowed for UnnamedPlayer
UnnamedPlayer: Delta request from out of date packet.
WARNING: msg overflowed for UnnamedPlayer
]
Program received signal SIGSEGV, Segmentation fault.
0x080599c7 in SV_SendClientMessages () at code/server/sv_snapshot.c:681
681                     if (!c->state) {

#0  0x080599c7 in SV_SendClientMessages () at code/server/sv_snapshot.c:681
#1  0x00000008 in ?? ()
#2  0x00004000 in ?? ()
#3  0x00001700 in ?? ()
#4  0xbe2a6c00 in ?? ()
#5  0xa07ff4f6 in ?? ()
#6  0xffcf5800 in ?? ()
#7  0x0583cbff in ?? ()
#8  0x28a98008 in ?? ()
#9  0x00000808 in ?? ()
#10 0x0f182000 in ?? ()
#11 0x00000000 in ?? ()

[^misantropia^]

I know that bit of code, it iterates over the svs.clients array. c = svs.clients and it looks like it doesn't point to a valid client_t structure (NULL or stray pointer).

[nexus024]

Can you give an example of what might be causing this? I haven't touched any of the code in sv_snapshot.c...

[^misantropia^]

Stray pointers? When management asks, I blame it on cosmic radiation corrupting memory bits. That'll teach 'em cheap-skates to not buy ECC memory.

But seriously, it's hard to say. Does this also happen in vanilla Q3? (Probably not, else I would've heard of it). If not, consider your code changes carefully - somewhere you introduced a bug. If all else fails, go back a few revisions until the problem goes away. You are using some form of source control like CVS or Subversion, right?