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Fri Feb 13 14:42:47 CET 2009

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On Fri, Feb 13, 2009 at 5:00 AM, <support-request at lists.openmoko.org> wrote:

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> Today's Topics:
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>   1. Garbage values in Logged System Call (Bilal Mehdi)
>   2. Re: Garbage values in Logged System Call (Joachim Ott)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 12 Feb 2009 05:54:42 -0800 (PST)
> From: Bilal Mehdi <bilal.mehdi at yahoo.com>
> Subject: Garbage values in Logged System Call
> To: openmoko kernel <openmoko-kernel at lists.openmoko.org>,       openmoko
>        support <support at lists.openmoko.org>
> Message-ID: <936270.68940.qm at web110301.mail.gq1.yahoo.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> 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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> ------------------------------
>
> Message: 2
> Date: Thu, 12 Feb 2009 18:00:45 +0100
> From: Joachim Ott <jo.omsl at googlemail.com>
> Subject: Re: Garbage values in Logged System Call
> To: bilal.mehdi at yahoo.com,      Support for Openmoko Device Owners
>        <support at lists.openmoko.org>
> Cc: openmoko kernel <openmoko-kernel at lists.openmoko.org>
> Message-ID:
>        <d2be2e370902120900s7600ebd5td393fa4cf8f10b7e at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> 2009/2/12 Bilal Mehdi <bilal.mehdi at yahoo.com>:
> > ...
> > 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
>
> When you do "strace /bin/ls" n your desktop, you will notice the
> following syscall at that position:
>
> set_thread_area({entry_number:-1 -> 6, base_addr:0xb7d92700,
> limit:1048575, seg_32bit:1, contents:0, read_exec_only:0,
> limit_in_pages:1, seg_not_present:0, useable:1}) = 0
>
> Maybe the strace on the FR needs an update?
>
>
>
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> End of support Digest, Vol 8, Issue 24
> **************************************
>

-- 
Sashi
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