Re: [SPAM] Re: "Segfault/illegal instruction" - udevd - ntpd - glibc

[Markus Gothe <markus.gothe@27m.se>]

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Ralf Baechle wrote:
> On Fri, Jun 15, 2007 at 09:23:34PM +0530, Sadarul Firos wrote:
>
>> I am working with two MIPS based boards (one is MIPS and the other is
>> MIPSEL) running linux-2.6.18/glibc-2.3.5. I am performing a consecutive
>> reboot test on these boards. After some number of reboots (say 80) I  am
>> getting "segmentaion fault/illegal instruction" while running udevd and
>> ntpd during bootup. Upon observing the core dump, it is noted that the
>> segfault occured from the _init function of libnss_dns.so (in the case
>> of ntpd) and libnss_compat.so (in the case of udevd). I assume that
>> there might be a problem somewhere in the call_init function in
>> glibc-2.3.5/elf/dl-init.c. After I put some printf statements for
>> debugging in the call_init function, there is no segfault/illegal
>> instruction in the reboot testing. I have also used gdb to debug the
>> problem but the "segfault/illegal instruction" doesn't occur during the
>> reboot test. Could anyone please help me to sort out this problem. The
>> gdb output using coredump is attached.
>
> Normally the address space layout and most other variables during a
> program load should be identical each time so userspace should behave
> identical.   So I sense the scent of a TLB or more likely cache managment
> problem.
>
> What 2.6.18 variant exactly are you running, that is where & when did
> download it, what CPU?
>
>   Ralf
>
Seems to me like a timing issue if printf'ing helps. You should try
invoking udevd by gdb (without the printf's).

- --
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Mr Markus Gothe
Software Engineer

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