On Tuesday 2009-12-15 08:38, David Miller wrote:
>> I added some dump_stack() to all the cp_* functions, leading
>> to this result:
>>
>> Call Trace:
>> [0000000000522990] cp_new_stat+0xdc/0x134
>> [0000000000522d9c] SyS_newfstat+0x24/0x38
>> [0000000000406294] linux_sparc_syscall+0x34/0x44
>>
>> Is glibc doing the right thing here? Calling sys_newfstat (instead of
>> sys_newfstat64) for fstat64()?
>
>That's completely bogus.
>
>And I can't reproduce your problem on debian unstable. What
>are you using, Fedora? Maybe something is fubared in their
>glibc build or the checkout they are using.
It seems like a glibc bug, but it is also happening on Debian now:
I have no name!@ares:/# gcc stat.c -o stat64 -m64 -Wall
I have no name!@ares:/# ./stat64
1262990222.527474569
1262990222.000000000
I have no name!@ares:/# dpkg-query -W | grep libc
libc-bin 2.10.2-4
libc-dev-bin 2.10.2-4
libc6 2.10.2-4
libc6-dev 2.10.2-4
libc6-dev-sparc64 2.10.2-4
libc6-sparc64 2.10.2-4
And I can see why that is:
$ ./strace/strace-4.5.19/strace ./stat64
execve("./stat64", ["./stat64"], [/* 67 vars */]) = 0
uname({sys="Linux", node="ares", ...}) = 0
brk(0) = 0x28e000
brk(0x28ef50) = 0x28ef50
brk(0x2b0f50) = 0x2b0f50
brk(0x2b2000) = 0x2b2000
open("foo", O_RDWR|O_CREAT, 0666) = 3
lstat64(0x16b288, 0x7feff880a78) = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 12), ...}) = 0
Compare with:
$ ./strace/strace-4.5.19/strace ./stat32
execve("./stat32", ["./stat32"], [/* 67 vars */]) = 0
uname({sys="Linux", node="ares", ...}) = 0
brk(0) = 0xb2000
brk(0xb2cd0) = 0xb2cd0
brk(0xd4cd0) = 0xd4cd0
brk(0xd6000) = 0xd6000
open("foo", O_RDWR|O_CREAT, 0666) = 3
lstat64(0x806d8, 0xffdc1030) = 0
fstat64(0x3, 0xffdc1030) = 0
fstat64(0x1, 0xffdc08b8) = 0
So glibc calls fstat instead of fstat64. That does not sound
right at all.
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