[erlang-patches] fix valgrind error in erts/emulator/drivers/unix/ttsl_drv.c

Sverker Eriksson <>
Mon Apr 22 10:53:03 CEST 2013


The other call to memcpy in the same function del_chars() seems to have 
the same problem.
Probably possible to trigger with ctrl-D.

/Sverker

Lukas Larsson wrote:
> Hello Steve!
>
> Thanks for the patch.
>
> I had to use ctrl-H in the middle of a term in the terminal to trigger 
> the report, was this the case for you as well?
>
> Lukas
>
> On 22/04/13 02:23, Steve Vinoski wrote:
>> On Linux I noticed the following complaint while doing some valgrind 
>> testing:
>>
>> ==18040== Thread 6:
>> ==18040== Source and destination overlap in memcpy(0xf3f3f04, 
>> 0xf3f3f08, 52)
>> ==18040==    at 0x4C2CFA0: memcpy@@GLIBC_2.14 (in 
>> /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
>> ==18040==    by 0x5CF527: del_chars (ttsl_drv.c:845)
>> ==18040==    by 0x5CED5E: ttysl_from_erlang (ttsl_drv.c:658)
>> ==18040==    by 0x4982E3: erts_write_to_port (io.c:1235)
>> ==18040==    by 0x49A2BD: erts_port_command (io.c:2223)
>> ==18040==    by 0x48C054: do_send (bif.c:1962)
>> ==18040==    by 0x48CB6E: erl_send (bif.c:2162)
>> ==18040==    by 0x566599: process_main (beam_emu.c:1665)
>> ==18040==    by 0x4B1A95: sched_thread_func (erl_process.c:4834)
>> ==18040==    by 0x6075E2: thr_wrapper (ethread.c:106)
>> ==18040==    by 0x5560E99: start_thread (pthread_create.c:308)
>>
>> This patch fixes the problem.
>>
>> git fetch git://github.com/vinoski/otp.git 
>> <http://github.com/vinoski/otp.git> sv-ttsl-valgrind
>>
>> https://github.com/vinoski/otp/compare/erlang:maint...sv-ttsl-valgrind
>> https://github.com/vinoski/otp/compare/erlang:maint...sv-ttsl-valgrind.patch 
>>
>>
>> --steve
>>
>>
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>> 
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>
>
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