[OpenAFS-devel] Re: afsd-fuse segfaults

[Derrick Brashear]

http://gerrit.openafs.org/8136
causes --enable-debug to be honored in the same way in libuafs as
other userspace code.

On Tue, Sep 18, 2012 at 10:45 AM, Derrick Brashear <shadow@gmail.com> wrote:
>> [New Thread 0x7ffff54d3700 (LWP 21044)]
>>
>> Program received signal SIGSEGV, Segmentation fault.
>> [Switching to Thread 0x7ffff697a700 (LWP 21033)]
>
> I assume that's the pthread scheduler thread and the library support
> built on the system does not
> include symbols for it. More interestingly I assume 21044 is the
> interesting thread, because it was
> running memcpy when we crashed. So...
>
>> 0x0000000000000000 in ?? ()
>> (gdb) bt
>> #0  0x0000000000000000 in ?? ()
>> #1  0x0000000000000000 in ?? ()
>> (gdb) thread
>> [Current thread is 2 (Thread 0x7ffff697a700 (LWP 21033))]
>> (gdb) help thread
>> Use this command to switch between threads.
>> The new thread ID must be currently known.
>>
>> List of thread subcommands:
>>
>> thread apply -- Apply a command to a list of threads
>> thread find -- Find threads that match a regular expression
>> thread name -- Set the current thread's name
>>
>> Type "help thread" followed by thread subcommand name for full documentation.
>> Type "apropos word" to search for commands related to "word".
>> Command name abbreviations are allowed if unambiguous.
>> (gdb) thread apply gdb
>> (gdb) thread apply bt
>> (gdb) thread apply bt all
>> (gdb) help thread apply
>> Apply a command to a list of threads.
>>
>> List of thread apply subcommands:
>>
>> thread apply all -- Apply a command to all threads
>>
>> Type "help thread apply" followed by thread apply subcommand name for full documentation.
>> Type "apropos word" to search for commands related to "word".
>> Command name abbreviations are allowed if unambiguous.
>> (gdb) thread apply all bt
>>
>> Thread 13 (Thread 0x7ffff54d3700 (LWP 21044)):
>> #0  __memcpy_ssse3 () at ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:385
>> #1  0x000000000040402f in uafs_InitThread ()
>> #2  0x0000000000404075 in get_user_struct ()
>> #3  0x0000000000405c4d in call_syscall ()
>> #4  0x000000000040e79d in afsd_call_syscall ()
>> #5  0x000000000040ba6c in call_syscall_thread ()
>> #6  0x00007ffff7797b50 in start_thread (arg=<optimized out>) at pthread_create.c:304
>> #7  0x00007ffff6a5390d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
>> #8  0x0000000000000000 in ?? ()
>
> Get a real line number for uafs_InitThread (you probably need to fix
> OPTF=-O2 in src/libuafs/Makefile or Makefile.common and remake
> libuafs;
> This is a bug I noticed last night and haven't fixed, namely, that
> --enable-debug doesn't override this.)
>
> My offhand guess would be an alignment issue.
>
> --
> Derrick



-- 
Derrick