Garbage values in Logged System Call

[Bilal Mehdi]

Dear Sir,

We have been tracing system calls of several processes on openmoko. But we are getting garbage values for some system calls. We are not sure whether the garbage value is an incorrectly logged system call or may be a call that never existed (i.e the system tried to record the system call which was never called). Initially we were trying our own developed application for logging. Seeing this error, we tried 'strace' but it also showed same errors.

Please note that we are seeing this same problem in Freerunner Emulator as well as actual openmoko set.

The output of strace for "ls" follows:

execve("/bin/ls", ["/bin/ls"], [/* 12 vars */]) = 0
brk(0)                                  = 0x88000
uname({sys="Linux", node="om-gta02", ...}) = 0
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/var/run/ld.so.cache", O_RDONLY)  = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=12311, ...}) = 0
mmap2(NULL, 12311, PROT_READ, MAP_PRIVATE, 3, 0) = 0x4001c000
close(3)                                = 0
open("/lib/libm.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0p1\0\000"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=677656, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40020000
mmap2(NULL, 708760, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x40025000
mprotect(0x400ca000, 28672, PROT_NONE)  = 0
mmap2(0x400d1000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xa4) = 0x400d1000
close(3)                                = 0
open("/lib/libgcc_s.so.1", O_RDONLY)    = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0008!\0\000"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=41996, ...}) = 0
mmap2(NULL, 72204, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x400d3000
mprotect(0x400dd000, 28672, PROT_NONE)  = 0
mmap2(0x400e4000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x9) = 0x400e4000
close(3)                                = 0
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\334K\1\000"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1136108, ...}) = 0
mmap2(NULL, 1171904, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x400e5000
mprotect(0x401f6000, 32768, PROT_NONE)  = 0
mmap2(0x401fe000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x111) = 0x401fe000
mmap2(0x40201000, 8640, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40201000
close(3)                                = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40021000
syscall_983045(0x400210d0, 0x400210d0, 0x68c, 0x400217a8, 0x40024060, 0, 0x60, 0xf0005, 0xffff566c, 0x608, 0x40024000, 0xbeabcb6c, 0, 0xbeabc840, 0x40001fa8, 0x40001fc0, 0x20000010, 0x400210d0, 0xc050, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) = 0
mprotect(0x401fe000, 4096, PROT_READ)   = 0
mprotect(0x400d1000, 4096, PROT_READ)   = 0
munmap(0x4001c000, 12311)               = 0
getpid()                                = 1459
getuid32()                              = 0
gettimeofday({1211513753, 120132}, NULL) = 0
ioctl(0, TIOCGWINSZ, {ws_row=24, ws_col=80, ws_xpixel=0, ws_ypixel=0}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
stat64(".", {st_mode=S_IFDIR|S_ISGID|0755, st_size=0, ...}) = 0
brk(0)                                  = 0x88000
brk(0xa9000)                            = 0xa9000
open(".", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
fstat64(3, {st_mode=S_IFDIR|S_ISGID|0755, st_size=0, ...}) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
getdents64(3, /* 4 entries */, 4096)    = 104
lstat64("./text", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
lstat64("./test.txt", {st_mode=S_IFREG|0644, st_size=28, ...}) = 0
getdents64(3, /* 0 entries */, 4096)    = 0
close(3)                                = 0
open("/usr/share/zoneinfo/UTC", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=118, ...}) = 0
fstat64(3, {st_mode=S_IFREG|0644, st_size=118, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4001c000
read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\0\0\1\0\0"..., 4096) = 118
close(3)                                = 0
munmap(0x4001c000, 4096)                = 0
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4001c000
write(1, "test.txt  text\n", 15test.txt  text
)        = 15
io_submit(0, 0, 0xfbad2088 <unfinished ... exit status 0>
Process 1459 detached

To describe the kernel we are using, the output of uname on openmoko set is:
Linux om-gta02 2.6.24 #1 PREEMPT Thu Apr 24 08:23:36 CST 2008 armv4t

and on emulator is;
Linux fic-gta01 2.6.22.5-moko11 #1 PREEMPT Sat Dec 1 03:40:58 CET 2007 armv4tl

Kindly advise us how to tackle this problem.



      
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