Carlos,
I had a gcc testsuite failure today on my c3k (2.6.22.14) that
suggests there is a random issue with execv. The test didn't
fail when I reran the test. xgcc was trying to execv collect2.
This is the backtrace from the core file:
(gdb) bt
#0 0x403cb2b8 in ?? () from /lib/ld.so.1
#1 0x403c2670 in ?? () from /lib/ld.so.1
#2 0x403bd368 in ?? () from /lib/ld.so.1
#3 0x403bd698 in ?? () from /lib/ld.so.1
#4 0x403c0ee4 in ?? () from /lib/ld.so.1
#5 0x403c7cc8 in ?? () from /lib/ld.so.1
#6 0x00027a3c in pex_unix_exec_child (obj=0x42f84, flags=275048,
executable=0x4afe8 "", argv=0x1, env=0xfb255c48, in=1083198820, out=0,
errdes=-81437888, toclose=580, errmsg=0xc, err=0x42784)
at ../../gcc/libiberty/pex-unix.c:433
#7 0x000272f8 in pex_run_in_environment (obj=0x4ecd0, flags=1,
executable=0x4ec80 "/home/dave/gnu/gcc-4.3/objdir/gcc/collect2",
argv=0x4bd40, env=0x42f84, orig_outname=0x0,
errname=0x2b000 ' ' <repeats 19 times>, "Time the execution of each subprocess\n", err=0x6) at ../../gcc/libiberty/pex-common.c:342
#8 0x000274d0 in pex_run (obj=0x10b07, flags=1, executable=0xfb255f08 "",
argv=0x10a74, orig_outname=0x42f84 "", errname=0xfb255a00 "@=$h",
err=0x4bd40) at ../../gcc/libiberty/pex-common.c:372
#9 0x00014be8 in execute () at ../../gcc/gcc/gcc.c:2982
#10 0x0001dc08 in main (argc=1077757630, argv=0x403d46d6)
at ../../gcc/gcc/gcc.c:6765
(gdb) disass 0x403cb2a8 0x403cb2c8
Dump of assembler code from 0x403cb2a8 to 0x403cb2c8:
0x403cb2a8: copy r26,ret0
0x403cb2ac: b,l 0x403cb200,r0
0x403cb2b0: copy ret0,r26
0x403cb2b4: ldb 0(r26),ret0
0x403cb2b8: ldb 0(r25),r20
0x403cb2bc: ldo 1(r26),r26
0x403cb2c0: cmpib,= 0,ret0,0x403cb2d8
0x403cb2c4: ldo 1(r25),r25
End of assembler dump.
(gdb) p $r25
$8 = 1
The segv was at 0x403cb2b8. Think the function starts at 0x403cb0dc.
This is debian libc6 2.7-4.
I looked at code and call in frame 6 as it seemed a little suspicious
that gdb printed 1 for argv. However, the assembly code and the argv
data all seemed ok.
Any thoughts on how r25 might have becom corrupted?
Dave
--
J. David Anglin dave.anglin@xxxxxxxxxxxxxx
National Research Council of Canada (613) 990-0752 (FAX: 952-6602)
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