Re: PROBLEM - OOPS in print_context_stack when using --callgraph=2 in, 2.6.27 and later

[Maynard J. <may...@us...>]

John Lumby wrote:
> 
> On an SMP x86 with 2 SMT-enabled atom 330 cores  (4 logical CPUs)
> 
> 
> 
> Problem is reproducible every time in all kernel releases from 2.6.37.6
So what is the oops message?  Robert (on cc) is the oprofile kernel driver maintainer.  If you can give some details, maybe he can say whether the symptoms sound familiar.

-Maynard
> 
> up to 2.6.39-rc5,  but no problem in 2.6.36,  and no problem if I omit the --callgraph=2 option
> 
> 
> 
> My opcontrol command lines :
> 
> 
> 
> (First I set ksrcdir to my kernel build directory like so)
> 
> ksrcdir= symlink target of /lib/modules/`uname -r`/source
> 
> 
> 
> then
> 
> 
> 
> opcontrol --init;
> 
> opcontrol --setup --vmlinux=${ksrcdir}/vmlinux --separate=cpu --callgraph=2;
> 
> opcontrol --start-daemon --vmlinux=${ksrcdir}/vmlinux;
> 
> opcontrol --start --separate=cpu;
> 
> 
> 
> OOPS occurs soon after.    The OOPS offset is at the line reading
> 
>          addr = *stack;
> 
> and register EBX (which contains value of stack) is garbaged  -   0x0000000a
> 
> 
> 
> 
> 
> I see some other mentions of similar problems elsewhere,  but they are
> 
> all for much older kernels,  and in my case the above commands work fine
> 
> on 23.6.36
> 
> 
> 
> John Lumby
> 
> -------------------------
> 
> output of ver_linux
> 
> 
> 
> Linux lumbyont.localdomain 2.6.39-rc5 #5 SMP Tue May 3 11:04:57 EDT 2011
> 
> i686 GNU/Linux
> 
> 
> 
> Gnu C                  4.4.4
> 
> Gnu make               3.81
> 
> binutils               2.19.1
> 
> util-linux             2.13-pre7
> 
> mount                  support
> 
> module-init-tools      3.3-pre1
> 
> e2fsprogs              1.41.13
> 
> pcmciautils            014
> 
> quota-tools            3.13.
> 
> PPP                    2.4.4
> 
> isdn4k-utils           3.9
> 
> Linux C Library        2.11.1
> 
> Dynamic linker (ldd)   2.11.1
> 
> Procps                 3.2.7
> 
> Net-tools              1.60
> 
> Kbd                    1.12
> 
> oprofile               0.9.7git
> 
> Sh-utils               8.9
> 
> udev                   095
> 
> wireless-tools         29
> 
> Modules Loaded         xt_NFLOG nfnetlink_log nfnetlink ppp_synctty
> 
> ppp_async crc_ccitt ppp_generic slhc via_rhine snd_hda_intel
> 
> snd_hda_codec rtc_cmos rtc_core rtc_lib bridge stp llc i915
> 
> drm_kms_helper intel_agp intel_gtt tun xt_state ipt_MASQUERADE
> 
> iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 dm_mod
> 
> parport_pc lp parport 
>  		 	   		  
> 
> 
> 
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> 
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