Hi Maria,
For the "GPF: Dkbox.c:638 Double free” error, is a core file being created when
the server crashes ( note core size for user account should be set to be
unlimited with command “ulimit -c unlimited” first), as if so you can create a
debug unstripped Virtuoso binary, recreate the core with it and use gdb to
debug and obtain a back trace as follows:
1. Configure using the —with debug option:
./configure —with-debug
2. In the Makefile, check to ensure CFLAGS has the “-g” option set which
generates debug information:
CFLAGS = -g -O2
3. Then do "make clean all deinstall reinstall” to build a new debug
unstripped binary (virtuoso-t)
4. Start database with this new binary and force the crash condition again to
generate a new core file
5. Use gdb to load core file
gdb virtuoso-t core
6. At the prompt, type "bt" or “backtrace” to backtrace through stack and
provide the output when top of stack is reached.
Best Regards
Hugh Williams
Professional Services
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> On 9 Apr 2015, at 12:46, Maria Jackson <maria.jackson....@gmail.com> wrote:
>
> Sorry for another edit I am running Virtuoso on 64GB RAM machine.
>
> On Thu, Apr 9, 2015 at 5:16 PM, Maria Jackson <maria.jackson....@gmail.com>
> wrote:
> Also now I have reduced my memory requirement in virtuoso.ini (and restarted
> Virtuoso again):
> ;; Uncomment next two lines if there is 16 GB system memory free
> NumberOfBuffers = 1360000
> MaxDirtyBuffers = 1000000
>
>
> I am running Virtuoso on 64GB machine
>
> On Thu, Apr 9, 2015 at 5:10 PM, Maria Jackson <maria.jackson....@gmail.com>
> wrote:
> Additionally after continuously showing "Monitor: The mp_mmap_clocks over 10%
> of real time", the program stops with the following message:
>
> 15:58:04 ./virtuoso-t() [0x922db8]
> 15:58:04 ./virtuoso-t() [0x922e26]
> 15:58:04 ./virtuoso-t() [0x911c60]
> 15:58:04 ./virtuoso-t() [0x922add]
> 15:58:04 ./virtuoso-t(clrg_destroy+0x171) [0x87e9c1]
> 15:58:04 ./virtuoso-t(dk_free_tree+0x5c) [0x911f2c]
> 15:58:04 ./virtuoso-t() [0x614e57]
> 15:58:04 ./virtuoso-t() [0x614f61]
> 15:58:04 ./virtuoso-t() [0x61533f]
> 15:58:04 ./virtuoso-t() [0x618832]
> 15:58:04 ./virtuoso-t(aq_sql_func+0x272) [0x4593d2]
> 15:58:04 ./virtuoso-t(aq_thread_func+0x1bf) [0x45b9af]
> 15:58:04 ./virtuoso-t() [0x92d195]
> 15:58:04 /lib64/libpthread.so.0() [0x343e8079d1]
> 15:58:04 /lib64/libc.so.6(clone+0x6d) [0x343e0e88fd]
> 15:58:04 GPF: Dkbox.c:638 Double free
> GPF: Dkbox.c:638 Double free
> Segmentation fault
>
>
> Can someone please suggest as to where am I going wrong?
>
>
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