[Users] Segmentation Fault
Vidhya Nagarajan
vids85 at gmail.com
Wed Jul 8 14:55:54 EDT 2009
Steve,
Can you please tell me how a container can be granted access to real devices
like network interfaces
<http://en.wikipedia.org/wiki/Network_interface>, serial
ports <http://en.wikipedia.org/wiki/Serial_port>, disk
partitions<http://en.wikipedia.org/wiki/Disk_partition>,
etc ?
Thanks a lot for your time!
Vidhya
On Fri, Jun 26, 2009 at 1:45 PM, Vidhya Nagarajan <vids85 at gmail.com> wrote:
> Hello Steve,
>
> Thanks for you reply! Here is what I get when I do an strace.
>
> I guess the container need a dedicated disk device and since it doesn't
> have one at the momet, its seg faulting. How would I share a disk device
> with a container?
>
>
> [root at rajeshr-linux bin]# strace ./monitord -s localhost -p 8367 -d -v
> execve("./monitord", ["./monitord", "-s", "localhost", "-p", "8367", "-d",
> "-v"], [/* 17 vars */]) = 0
> brk(0) = 0x9c4f000
> uname({sys="Linux", node="rajeshr-linux", ...}) = 0
> access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or
> directory)
> open("/etc/ld.so.cache", O_RDONLY) = 3
> fstat64(3, {st_mode=S_IFREG|0644, st_size=9708, ...}) = 0
> mmap2(NULL, 9708, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7ffb000
> close(3) = 0
> open("/lib/libpthread.so.0", O_RDONLY) = 3
> read(3,
> "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\360G\0\0004\0\0\0"..., 512)
> = 512
> fstat64(3, {st_mode=S_IFREG|0755, st_size=127700, ...}) = 0
> mmap2(NULL, 94688, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
> 0x888000
> mmap2(0x89c000, 8192, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x13) = 0x89c000
> mmap2(0x89e000, 4576, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x89e000
> 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\3\0\1\0\0\0\320`\1\0004\0\0\0"..., 512)
> = 512
> fstat64(3, {st_mode=S_IFREG|0755, st_size=1670312, ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0xb7ffa000
> mmap2(NULL, 1390032, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0)
> = 0x2d1000
> mmap2(0x41f000, 12288, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14e) = 0x41f000
> mmap2(0x422000, 9680, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x422000
> close(3) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0xb7ff9000
> set_thread_area({entry_number:-1 -> 6, base_addr:0xb7ff96c0, limit:1048575,
> seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1,
> seg_not_present:0, useable:1}) = 0
> mprotect(0x41f000, 8192, PROT_READ) = 0
> mprotect(0x89c000, 4096, PROT_READ) = 0
> mprotect(0x856000, 4096, PROT_READ) = 0
> munmap(0xb7ffb000, 9708) = 0
> set_tid_address(0xb7ff9708) = 3761
> set_robust_list(0xb7ff9710, 0xc) = 0
> rt_sigaction(SIGRTMIN, {0x88c2e0, [], SA_RESTORER|SA_SIGINFO, 0x895290},
> NULL, 8) = 0
> rt_sigaction(SIGRT_1, {0x88c360, [], SA_RESTORER|SA_RESTART|SA_SIGINFO,
> 0x895290}, NULL, 8) = 0
> rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
> getrlimit(RLIMIT_STACK, {rlim_cur=10240*1024, rlim_max=RLIM_INFINITY}) = 0
> uname({sys="Linux", node="rajeshr-linux", ...}) = 0
> socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
> brk(0) = 0x9c4f000
> brk(0x9c70000) = 0x9c70000
> open("/etc/resolv.conf", O_RDONLY) = 4
> fstat64(4, {st_mode=S_IFREG|0644, st_size=20, ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0xb7ffd000
> read(4, "nameserver 10.0.2.1\n", 4096) = 20
> read(4, "", 4096) = 0
> close(4) = 0
> munmap(0xb7ffd000, 4096) = 0
> uname({sys="Linux", node="rajeshr-linux", ...}) = 0
> socket(PF_FILE, SOCK_STREAM, 0) = 4
> fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
> connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1
> ENOENT (No such file or directory)
> close(4) = 0
> socket(PF_FILE, SOCK_STREAM, 0) = 4
> fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
> connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1
> ENOENT (No such file or directory)
> close(4) = 0
> open("/etc/nsswitch.conf", O_RDONLY) = 4
> fstat64(4, {st_mode=S_IFREG|0644, st_size=1696, ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0xb7ffd000
> read(4, "#\n# /etc/nsswitch.conf\n#\n# An ex"..., 4096) = 1696
> read(4, "", 4096) = 0
> close(4) = 0
> munmap(0xb7ffd000, 4096) = 0
> open("/etc/ld.so.cache", O_RDONLY) = 4
> fstat64(4, {st_mode=S_IFREG|0644, st_size=9708, ...}) = 0
> mmap2(NULL, 9708, PROT_READ, MAP_PRIVATE, 4, 0) = 0xb7ffb000
> close(4) = 0
> open("/lib/libnss_files.so.2", O_RDONLY) = 4
> read(4,
> "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\340\30\0\0004\0\0\0"...,
> 512) = 512
> fstat64(4, {st_mode=S_IFREG|0755, st_size=50840, ...}) = 0
> mmap2(NULL, 45712, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) =
> 0x649000
> mmap2(0x653000, 8192, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x9) = 0x653000
> close(4) = 0
> mprotect(0x653000, 4096, PROT_READ) = 0
> munmap(0xb7ffb000, 9708) = 0
> open("/etc/host.conf", O_RDONLY) = 4
> fstat64(4, {st_mode=S_IFREG|0644, st_size=17, ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0xb7ffd000
> read(4, "order hosts,bind\n", 4096) = 17
> read(4, "", 4096) = 0
> close(4) = 0
> munmap(0xb7ffd000, 4096) = 0
> futex(0x4237e0, FUTEX_WAKE, 2147483647) = 0
> open("/etc/hosts", O_RDONLY) = 4
> fcntl64(4, F_GETFD) = 0
> fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
> fstat64(4, {st_mode=S_IFREG|0644, st_size=42, ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0xb7ffd000
> read(4, "127.0.0.1 localhost.localdomain "..., 4096) = 42
> close(4) = 0
> munmap(0xb7ffd000, 4096) = 0
> fstat64(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 0), ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0xb7ffd000
> write(1, "Just defined sockaddr->sin_addr."..., 50Just defined
> sockaddr->sin_addr.in_addr=(100007f)
> ) = 50
> open("/proc/stat", O_RDONLY) = 4
> fstat64(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0xb7ffc000
> read(4, "cpu 107 0 137 3102929 8 0 0 0\nc"..., 4096) = 159
> close(4) = 0
> munmap(0xb7ffc000, 4096) = 0
> open("/proc/diskstats", O_RDONLY) = -1 ENOENT (No such file or
> directory)
> --- SIGSEGV (Segmentation fault) @ 0 (0) ---
> +++ killed by SIGSEGV +++
>
> Thanks,
> Vidhya
>
>
> On Fri, Jun 26, 2009 at 12:06 PM, Steven Tardy <sjt5 at its.msstate.edu>wrote:
>
>> Vidhya Nagarajan wrote:
>>
>>> Hello everyone,
>>>
>>> I am new to OpenVZ and so far I have liked it a lot. The Quick
>>> installation
>>> guide is extremely useful. I am trying to run a thermal emulation model
>>> inside a container. I have installed all the necessary packages, However,
>>> When I run the thermal emulation software which basically collects the
>>> power
>>> consumed by the components(cpu,network,disk) of the machine, I get a
>>> segmentation fault. When I run the same in the host node, I don't get any
>>> error and the software runs smoothly.
>>>
>>> For the thermal emulation model I need to set the /dev/sda properly.
>>> However
>>> when I tried to run /dev from the container I could not get sda or hda
>>> but
>>> rather found "pts". what does that mean?
>>>
>>>
>>> From inside the container :
>>>>
>>>
>>> [root at rajeshr-linux bin]# ./monitord -p 8367 -s localhost -d -v
>>> Just defined sockaddr->sin_addr.in_addr=(100007f)
>>> Segmentation fault
>>>
>>> Is it because the container is not given access to the power modules in
>>> the
>>> host node? I have mounted three of the folders from the host node to the
>>> container using the command
>>>
>>
>> that software probably reads from something in /proc
>>
>> troubleshooting 101 (strace):
>> strace ./monitord -p 8367 -s localhost -d -v
>>
>> see what errors strace returns
>>
>> --
>> Steven Tardy
>> Systems Programmer
>> Information Technology Infrastructure
>> Information Technology Services
>> Mississippi State University
>> sjt5 at its.msstate.edu
>> _______________________________________________
>> Users mailing list
>> Users at openvz.org
>> https://openvz.org/mailman/listinfo/users
>>
>
>
>
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