Re: Strange deadlocks in guile

[Neil Jerram]

Stanislav Ievlev <address@hidden> writes:

> Greetings!
>
> On my 2.6.18 kernel guile (latest snapshot from git, branch-release-1.8 head) 
> in some situations (unfortunately I can't made a testcase) stops forever. 
> Guile
> with 2.6.27 kernel works well.
>
> Strace:
> futex(0xc571890, FUTEX_WAIT, 2, NULL...
>
> Backtrace:
> --
> #0  0x00002b4ba31b4004 in __lll_lock_wait () from /lib64/libpthread.so.0
> #1  0x00002b4ba31af944 in _L_lock_55 () from /lib64/libpthread.so.0
> #2  0x00002b4ba31af341 in pthread_mutex_lock () from /lib64/libpthread.so.0
> #3  0x00002b4ba22f87dc in scm_i_thread_put_to_sleep () from /usr/lib64/
> libguile.so.17
> #4  0x00002b4ba22abfd9 in scm_i_gc () from /usr/lib64/libguile.so.17
> #5  0x00002b4ba22ac338 in scm_gc_for_newcell () from /usr/lib64/libguile.so.17
> #6  0x00002b4ba22cc86f in scm_cons () from /usr/lib64/libguile.so.17
> --
>
> How can I debug and solve this problem?

The backtrace above only has 7 frames, and there should be many more.
Can you get the full backtrace, and also backtraces of all the other
threads?

We've recently been working quite a bit on deadlocks, so I'd say
there's a good chance we'll be able to understand and fix this.

Thanks,
        Neil