Hi all,
I am porting an application written in HP-UX to Linux [pure C] for
unobvious reasons like Linux being wider and cheaper supported Unix
platform for cheap IBM/PC arch. Somehow the client my employer has put
in service of - seems to agree with me. So here I am - porting the
application to Linux. Luckily, except for datatype "long long", all the
basic datatypes are of the same width. Hence run-time errors shall be
less.
But here is one. Below is the output from gdb's command "where" - the
stack at the time of failure. I get a segmentation violation while
running - at the time of a malloc. There are printf statements both
before and after the malloc - as well as /proc/meminfo is examined
before and after malloc.
malloc - supposed to return null if the request is not complete - seems
to be crashing. Take a look and see if anyone can see something good
here? [wrapped lines are actually contiguous]
---------
piece of code
---------
--
struct RegistryItem *new_item2 = NULL;
--
printf("Malloc for %s, size = %d\n", name, sizeof(RegistryItem));
system("cat /proc/meminfo >
/home/rohit/Code/Mediator/refmt_base/port_test/asm/memory");
system("echo ABOUT TO MALLOC >>
/home/rohit/Code/Mediator/refmt_base/port_test/asm/memory");
new_item2 = malloc(sizeof(RegistryItem));
printf("Malloc returned ");
printf(" %p\n", new_item2);
system("cat /proc/meminfo >>
/home/rohit/Code/Mediator/refmt_base/port_test/asm/memory");
----
So as you see - I am trying to access all that I can. Program fails on
console with this message:
Malloc for 19_1_-1_0, size = 40
Malloc returned 0x8077d28
Malloc for 19_1_21_1, size = 40
mediator_cmd:F:*** Trapped signal 11: (Segmentation violation
----
Contents of memory file, rewritten to check status of memory available,
are:
rohit@force:~/Code/Mediator/refmt_base> cat port_test/asm/memory
total: used: free: shared: buffers: cached:
Mem: 129925120 125538304 4386816 0 8687616 40652800
Swap: 271425536 1200128 270225408
MemTotal: 126880 kB
MemFree: 4284 kB
MemShared: 0 kB
Buffers: 8484 kB
Cached: 38756 kB
SwapCached: 944 kB
Active: 43928 kB
Inactive: 60300 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 126880 kB
LowFree: 4284 kB
SwapTotal: 265064 kB
SwapFree: 263892 kB
ABOUT TO MALLOC
-- and then it fails.
>From gdb, I took a trace of stack using "where" and this followed:
Program received signal SIGSEGV, Segmentation fault.
0x400edd65 in chunk_free () from /lib/libc.so.6
(gdb) where
#0 0x400edd65 in chunk_free () from /lib/libc.so.6
#1 0x400eda3a in chunk_alloc () from /lib/libc.so.6
#2 0x400ed224 in malloc () from /lib/libc.so.6
#3 0x40043705 in register_item2 (which=4, name=0xbfffc590 "19_1_21_1",
location=0x8077b88, nelem=1,
stat_ind=0, clear_ind=0, is_dyn=0) at registry.c:909
#4 0x401a2ccb in process_aggregate_list (path=0x8051238
"ddt/aggregate_table.dat")
at aggregate_table.c:660
#5 0x401a223b in ddt_load_aggregate_table (name=0x8051200
"ddt_aggregate_table",
source=0x8051238 "ddt/aggregate_table.dat", location=0xbfffc874,
nelem=0xbfffc870, argument=0x0)
at aggregate_table.c:223
#6 0x4001eeab in call_load_functions ()
at
/home/rohit/Code/Mediator/refmt_base/programs/additionaldata.c:769
#7 0x400229c0 in load_or_display_file (disp_f=0)
at
/home/rohit/Code/Mediator/refmt_base/programs/load_or_display.c:739
#8 0x40022a1d in load_file () at
/home/rohit/Code/Mediator/refmt_base/programs/load_or_display.c:753
#9 0x080499f2 in main (argc=11, argv=0xbffff1f4) at
reformatter_cmd.c:361
#10 0x400969ed in __libc_start_main () from /lib/libc.so.6
(gdb)
This was quite a mail. Can anyone let me know what is familiar here? I
shall meanwhile try and see if there are any updated available for
libc.
Rohit
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