Date: Mon, 12 Sep 2016 14:57:01 -0500 From: Joe Love <joe@getsomewhere.net> To: freebsd-emulation@freebsd.org Subject: Re: linux-compat semctl operation - bad address Message-ID: <4AB10098-988D-4DB9-ADB3-8F0C26C86B73@getsomewhere.net> In-Reply-To: <276F4863-DE8C-49F7-BB60-F8614F88064C@getsomewhere.net> References: <276F4863-DE8C-49F7-BB60-F8614F88064C@getsomewhere.net>
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> On Sep 9, 2016, at 4:34 PM, Joe Love <joe@getsomewhere.net> wrote:
>
> Hi,
>
> I have a linux binary I’m trying to run on a 12-CURRENT machine with the linux_base-c7 (64-bit) port.
>
> When trying to run it, it starts up and then spits out this error:
> shm_semaphores_init: semctl init error: Bad address - trying again
>
> I’m guessing that it’s reaching the end of the switch statement in sys/compat/linux/linux_ipc.c’s linux_semctl(…) function and getting an EINVAL result. That’s a guess, however, as I don’t know enough about debugging at this level in order to tell what it’s actually doing.
>
> Can anyone tell me how to get the results of the linux_msg() call at the end of the function to find out what ipc type it’s trying to utilize, and with a little luck maybe get a patch created to support whatever operation it’s trying?
>
> Thanks,
> -Joe
>
A little further explanation (since I failed to give it earlier): I have two linux game servers that do this, “7 Days to Die” (7dtd) and “Unturned.” Based on the first dtrace probe I tried (entry), it seems that 7dtd might be easier to understand. Obviously I don’t have access to game sources.
I did a little digging with dtrace, though my knowledge of dtrace is all new as of this experience.
/* my dtrace probe file, semprobe.d */
fbt:linux:linux_semctl:entry,
fbt:linux64:linux_semctl:entry
{
/* args->cmd & ~LINUX_IPC_64 .. LINUX_IPC_64 = 0x0100 */
printf("%s (%d, %d, %d, %d)", probefunc, args[1]->cmd, args[1]->cmd & ~0x0100, args[1]->semid, args[1]->arg.val);
}
fbt:kernel:kern_semctl:entry
{
printf("%s (%d, %d, %d, %d)", probefunc, args[3], args[3], args[1], args[4]->val);
}
fbt:kernel:kern_semctl:return
{
printf("%s (%d, %d)", probefunc, args[1], errno);
}
fbt:linux:linux_semctl:return,
fbt:linux64:linux_semctl:return
{
printf("%s (%d, %d)\n", probefunc, args[1], errno);
}
I ran that with "dtrace -n semprobe.d”
When I ran the 7dtd server, dtrace proceeded to spit out this information (while 7dtd spat out it’s error in my first email):
dtrace: script 'semprobe.d' matched 6 probes
CPU ID FUNCTION:NAME
21 63000 linux_semctl:entry linux_semctl (0, 0, 952369158, 0)
21 37620 kern_semctl:entry kern_semctl (9, 9, 952369158, -11936)
21 37621 kern_semctl:return kern_semctl (14, 0)
21 63001 linux_semctl:return linux_semctl (14, 0)
21 63000 linux_semctl:entry linux_semctl (0, 0, 952369158, 0)
21 37620 kern_semctl:entry kern_semctl (0, 0, 952369158, 1876522240)
21 37621 kern_semctl:return kern_semctl (0, 14)
21 63001 linux_semctl:return linux_semctl (0, 14)
21 63000 linux_semctl:entry linux_semctl (0, 0, 952434694, 0)
21 37620 kern_semctl:entry kern_semctl (9, 9, 952434694, -11936)
21 37621 kern_semctl:return kern_semctl (14, 0)
21 63001 linux_semctl:return linux_semctl (14, 0)
21 63000 linux_semctl:entry linux_semctl (0, 0, 952434694, 0)
21 37620 kern_semctl:entry kern_semctl (0, 0, 952434694, 1876522240)
21 37621 kern_semctl:return kern_semctl (0, 14)
21 63001 linux_semctl:return linux_semctl (0, 14)
21 63000 linux_semctl:entry linux_semctl (0, 0, 952500230, 0)
21 37620 kern_semctl:entry kern_semctl (9, 9, 952500230, -11936)
21 37621 kern_semctl:return kern_semctl (14, 0)
21 63001 linux_semctl:return linux_semctl (14, 0)
21 63000 linux_semctl:entry linux_semctl (0, 0, 952500230, 0)
21 37620 kern_semctl:entry kern_semctl (0, 0, 952500230, 1876522240)
21 37621 kern_semctl:return kern_semctl (0, 14)
21 63001 linux_semctl:return linux_semctl (0, 14)
21 63000 linux_semctl:entry linux_semctl (0, 0, 952565766, 0)
21 37620 kern_semctl:entry kern_semctl (9, 9, 952565766, -11936)
21 37621 kern_semctl:return kern_semctl (14, 0)
21 63001 linux_semctl:return linux_semctl (14, 0)
21 63000 linux_semctl:entry linux_semctl (0, 0, 952565766, 0)
21 37620 kern_semctl:entry kern_semctl (0, 0, 952565766, 1876522240)
21 37621 kern_semctl:return kern_semctl (0, 0)
21 63001 linux_semctl:return linux_semctl (0, 0)
21 63000 linux_semctl:entry linux_semctl (0, 0, 952631302, 0)
21 37620 kern_semctl:entry kern_semctl (9, 9, 952631302, -11936)
21 37621 kern_semctl:return kern_semctl (14, 0)
21 63001 linux_semctl:return linux_semctl (14, 0)
21 63000 linux_semctl:entry linux_semctl (0, 0, 952631302, 0)
21 37620 kern_semctl:entry kern_semctl (0, 0, 952631302, 1876522240)
21 37621 kern_semctl:return kern_semctl (0, 0)
21 63001 linux_semctl:return linux_semctl (0, 0)
(and repeated the last 2 ’sets', with other semaphore ID’s, always incrementing)
I’m hoping someone can find fault with my assessment, because I don't understand why args->cmd seems to go from LINUX_IPC_RMID (0) to bsd’s SETALL (9).
Anyone have thoughts on what to check, or maybe what is going on?
Thanks,
-Joe
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