[OpenAFS-devel] Re: afsd-fuse segfaults

[Derrick Brashear]

> [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