Re: [Xen-devel] Segmentation fault of gdbserver-xen

[Kip Macy <kmacy@xxxxxxxxxxx>]

You will need to re-compile and re-install libxenctl with symbols (add
-g to the Makefile). With that done you'll be able to see where the
segmentation fault is occurring. There are frequently problems in the
domain VA mapping function.

                          -Kip

On Thu, 24 Aug 2006, Akio Takebe wrote:

> Hi,
>
> I tried to run gdbserver-xen with --file on xen-x86_64.
> But I have the following fault.
> Do anyone have the same error?
> Or do I have mistakes?
>
> # gdbserver-xen 127.0.0.1:9999 --file /var/xen/dump/vm1.1.core
> Attached; pid = 3
> Segmentation fault
>
> A part of the strace is below.
>
> mmap(NULL, 1264480, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
> 0) = 0x2b01270d9000
> mprotect(0x2b01270e5000, 1215328, PROT_NONE) = 0
> mmap(0x2b01271e4000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
> MAP_DENYWRITE, 3, 0xb000) = 0x2b01271e4000
> mmap(0x2b01271e5000, 166752, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED
> |MAP_ANONYMOUS, -1, 0) = 0x2b01271e5000
> close(3)                                = 0
> open("/lib64/tls/libc.so.6", O_RDONLY)  = -1 ENOENT (No such file or
> directory)
> open("/lib64/libc.so.6", O_RDONLY)      = 3
> read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\313"...,
> 640) = 640
> fstat(3, {st_mode=S_IFREG|0755, st_size=1485035, ...}) = 0
> mmap(0x386c200000, 2303368, PROT_READ|PROT_EXEC, MAP_PRIVATE|
> MAP_DENYWRITE, 3, 0) = 0x386c200000
> mprotect(0x386c329000, 1086856, PROT_NONE) = 0
> mmap(0x386c428000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
> MAP_DENYWRITE, 3, 0x128000) = 0x386c428000
> mmap(0x386c42e000, 17800, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
> MAP_ANONYMOUS, -1, 0) = 0x386c42e000
> close(3)                                = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0x2b012720e000
> mprotect(0x386c428000, 12288, PROT_READ) = 0
> munmap(0x2b01270b3000, 154694)          = 0
> open("2006-0823-1442.14-vm1.1.core", O_RDONLY) = 3
> open("/proc/xen/privcmd", O_RDWR)       = 4
> fcntl(4, F_GETFD)                       = 0
> fcntl(4, F_SETFD, FD_CLOEXEC)           = 0
> brk(0)                                  = 0x50d000
> brk(0x52e000)                           = 0x52e000
> rt_sigaction(SIGRT_1, {SIG_IGN}, {SIG_DFL}, 8) = 0
> write(2, "Attached; pid = 3\n", 18)     = 18
> read(3, "\355\353\17\360\1\0\0\0\355\371\0\0\30\0\0\0H\24\0\0\0"..., 24)
> = 24
> read(3, "\177\3\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\200"...,
> 5168) = 5168
> mmap(NULL, 512000, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0x2b012720f000
> read(3, "\2520\20\0\0\0\0\0:9\20\0\0\0\0\0\2764\20\0\0\0\0\0\333"...,
> 511848) = 511848
> mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0x2b012728c000
> --- SIGSEGV (Segmentation fault) @ 0 (0) ---
> +++ killed by SIGSEGV +++
>
> Best Regards,
>
> Akio Takebe
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>

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