Re: ctfmerge core dump

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"]
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
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> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> 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.