Re: ctfmerge core dump

On 2012/5/6 5:08, b. f. wrote:
> On 5/5/12, Steve Wills<swills_at_freebsd.org>  wrote:
>> On 05/05/12 15:43, b. f. wrote:
>>> Steve Wills wrote:
>>>> After updating from -CURRENT as of April 5 to one built today, I now get
>>>> a core dump running ctfmerge on libc:
>>>>
>>>> ctfmerge -L VERSION -g -o libc.so.7 syscall.So fork.So......
>>>> Bus error (core dumped)
>>>> *** [libc.so.7] Error code 138
>>>>
>>>> Anyone else seeing this or have any idea how to avoid it?
>>> Yes, I'm also seeing such problems when attempting to build a r235052
>>> amd64 kernel on r235035 amd64. (This problem did not occur when
>>> building a r235035 amd64 world and kernel on r234854 amd64.)  ctfmerge
>>> succeeds for several kernel modules but fails with kgssapi.ko.debug,
>>> linux.ko.debug, or kernel.debug. I'm not yet sure which change has
>>> caused this, or how to avoid it.
>>>
>> Thanks for the info. I took a look at the dump and see this:
>>
>> % sudo gdb /usr/bin/ctfmerge ctfmerge.core
>> [GDB will not be able to debug user-mode threads: Undefined symbol
>> "td_thr_getxmmregs"]

Hmm, is the thread debugging broken on amd64 now ?  td_thr_getxmmregs 
resides
in libthread_db and /usr/src/gnu/usr.bin/gdb/libgdb is complaining about 
the missing
symbol.


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>> This GDB was configured as "amd64-marcel-freebsd"...
>> Core was generated by `ctfmerge'.
>> Program terminated with signal 10, Bus error.
>> Reading symbols from /lib/libctf.so.2...done.
>> Loaded symbols for /lib/libctf.so.2
>> Reading symbols from /usr/lib/libdwarf.so.3...done.
>> Loaded symbols for /usr/lib/libdwarf.so.3
>> Reading symbols from /usr/lib/libelf.so.1...done.
>> Loaded symbols for /usr/lib/libelf.so.1
>> Reading symbols from /lib/libz.so.6...done.
>> Loaded symbols for /lib/libz.so.6
>> Reading symbols from /lib/libthr.so.3...done.
>> Loaded symbols for /lib/libthr.so.3
>> Reading symbols from /lib/libc.so.7...done.
>> Loaded symbols for /lib/libc.so.7
>> Reading symbols from /libexec/ld-elf.so.1...done.
>> Loaded symbols for /libexec/ld-elf.so.1
>> #0  0x00000000004064b0 in fifo_len (f=0x801c29070) at
>> /usr/src/cddl/usr.bin/ctfmerge/../../../cddl/contrib/opensolaris/tools/ctf/cvt/fifo.c:128
>> 128             for (i = 0, fn = f->f_head; fn; fn = fn->fn_next, i++);
>> (gdb) bt
>> #0  0x00000000004064b0 in fifo_len (f=0x801c29070) at
>> /usr/src/cddl/usr.bin/ctfmerge/../../../cddl/contrib/opensolaris/tools/ctf/cvt/fifo.c:128
>> #1  0x000000000040622c in worker_thread (wq=0x610ee0) at
>> /usr/src/cddl/usr.bin/ctfmerge/../../../cddl/contrib/opensolaris/tools/ctf/cvt/ctfmerge.c:329
>> #2  0x0000000801078da9 in thread_start (curthread=0x801c0f800) at
>> /usr/src/lib/libthr/thread/thr_create.c:284
>> #3  0x0000000000000000 in ?? ()
>> Cannot access memory at address 0x7fffff5fb000
>> (gdb)
>>
> After reverting the recent libthr changes in r234947, I am no longer
> encountering this problem.
>
> b.
>