sqlplus segfaults when receiving INT signal

[Roman Divacky]

On Mon, Sep 15, 2008 at 07:48:11PM +0400, Chagin Dmitry wrote:
> On Sun, Sep 14, 2008 at 08:49:33PM +0200, Roman Divacky wrote:
> > On Sun, Sep 14, 2008 at 01:25:19PM +0400, Chagin Dmitry wrote:
> > > > 
> > > > please provide ktrace/linux_kdump... the "unknown futex operation" problem is fixed
> > > > in this release so there must be something else
> > > 
> > >   1428 sqlplus  0.874520 CALL  munmap(0x28066000,0xc41d)
> > >   1428 sqlplus  0.874543 RET   munmap 0
> > >   1428 sqlplus  0.874553 CALL  linux_set_tid_address(0x292cf708)
> > >   1428 sqlplus  0.874563 RET   linux_set_tid_address 1428/0x594
> > >   1428 sqlplus  0.874572 CALL  linux_set_robust_list(0x292cf710,0xc)
> > >   1428 sqlplus  0.874580 RET   linux_set_robust_list -1 errno 22 (EINVAL) Invali
> > > d argument
> > >   1428 sqlplus  0.874596 CALL  linux_sys_futex(0xffffdbc4,FUTEX_WAKE|FUTEX_PRIVA
> > > TE_FLAG,0x1,0x292cf6c0,0x29154ff4,0xffffdbd8)
> > >   1428 sqlplus  0.874608 RET   linux_sys_futex 1
> > >   1428 sqlplus  0.874641 CALL  linux_rt_sigaction(SIG 32,0xffffd87c,0,0x8)
> > >   1428 sqlplus  0.874651 RET   linux_rt_sigaction 0
> > 
> > the robust futexes are also implemented in -CURRENT but I dont feel like
> > MFcing them.... the error is also harmless
> 
> it amd64, so, set_robust_list() here does not work. look at a patch bellow,
> I show it for example only because I don't understand how futexes work :)
> 
> 
> diff --git a/src/sys/compat/linux/linux_futex.c b/src/sys/compat/linux/linux_futex.c
> index 6588d23..73cf3a7 100644
> --- a/src/sys/compat/linux/linux_futex.c
> +++ b/src/sys/compat/linux/linux_futex.c
> @@ -551,7 +551,7 @@ linux_set_robust_list(struct thread *td, struct linux_set_robust_list_args *args
>  		return (EINVAL);
>  
>  	em = em_find(td->td_proc, EMUL_DOLOCK);
> -	em->robust_futexes = args->head;
> +	em->robust_futexes = PTRIN(args->head);
>  	EMUL_UNLOCK(&emul_lock);
>  
>  	return (0);	
> @@ -661,17 +661,17 @@ release_futexes(struct proc *p)
>  	if (head == NULL)
>  		return;
>  
> -	if (fetch_robust_entry(&entry, &head->list.next, &pi))
> +	if (fetch_robust_entry(&entry, PTRIN(&head->list.next), &pi))
>  		return;
>  
>  	if (copyin(&head->futex_offset, &futex_offset, sizeof(l_ulong)))
>  		return;
>  
> -	if (fetch_robust_entry(&pending, &head->pending_list, &pip))
> +	if (fetch_robust_entry(&pending, PTRIN(&head->pending_list), &pip))
>  		return;
>  
>  	while (entry != &head->list) {
> -		rc = fetch_robust_entry(&next_entry, &entry->next, &next_pi);
> +		rc = fetch_robust_entry(&next_entry, PTRIN(&entry->next), &next_pi);
>  
>  		if (entry != pending)
>  			if (handle_futex_death((char *)entry + futex_offset,
> diff --git a/src/sys/compat/linux/linux_futex.h b/src/sys/compat/linux/linux_futex.h
> index f6a2d4b..67b5115 100644
> --- a/src/sys/compat/linux/linux_futex.h
> +++ b/src/sys/compat/linux/linux_futex.h
> @@ -66,14 +66,22 @@
>  /* This is defined by Linux user-space */
>  
>  struct linux_robust_list {
> -	struct linux_robust_list	*next;
> -};
> +	l_uintptr_t	next;
> +}
> +#if defined(__amd64__) && defined(COMPAT_LINUX32)
> +__packed
> +#endif
> +;
>  
>  struct linux_robust_list_head {
>  	struct linux_robust_list	list;
>  	l_ulong				futex_offset;
> -	struct linux_robust_list	*pending_list;
> -};
> +	l_uintptr_t			pending_list;
> +}
> +#if defined(__amd64__) && defined(COMPAT_LINUX32)
> +__packed
> +#endif
> +;
>  
>  #define	FUTEX_WAITERS		0x80000000
>  #define	FUTEX_OWNER_DIED	0x40000000

this looks about right... I'll ask kostik to commit this,

dmitry, you should have commit bit :)