Re: [Linux-ia64] pthread failure ???

[David Mosberger <davidm@napali.hpl.hp.com>]

>>>>> On Wed, 12 Jun 2002 19:56:50 -0500 (CDT), Jack Steiner <steiner@sgi.com> said:

  Jack> We have a pthread'ed application that ran fine on IA64 2.4.17.

  Jack> When we upgraded the kernel to 2.4.18, the application started
  Jack> to fail. The failure occurs in glibc at: chunk_free
  Jack> __libc_free ...

  Jack> We verified that the app consistently fails with a 2.4.18
  Jack> kernel but works fine with a 2.4.17 kernel (same app &
  Jack> libraries).

  Jack> No other failures have been seen in other apps.

  Jack> Has anyone else seen this behavior or have any ideas??

I'm wondering if this is related to the fix for the "sp off by 16" bug
that was introduced in the 020410 ia64 patch.  The relevant bits are below.
Can you see if the problem occurs without these changes?

	--david

diff -urN linux-2.4.18/arch/ia64/ia32/ia32_entry.S lia64-2.4/arch/ia64/ia32/ia32_entry.S
--- linux-2.4.18/arch/ia64/ia32/ia32_entry.S	Mon Nov 26 11:18:19 2001
+++ lia64-2.4/arch/ia64/ia32/ia32_entry.S	Sat Feb  9 10:41:41 2002
@@ -37,7 +37,7 @@
 	mov loc1=r16				// save ar.pfs across do_fork
 	.body
 	zxt4 out1=in1				// newsp
-	mov out3=0				// stacksize
+	mov out3\x16				// stacksize (compensates for 16-byte scratch area)
 	adds out2=IA64_SWITCH_STACK_SIZE+16,sp	// out2 = &regs
 	zxt4 out0=in0				// out0 = clone_flags
 	br.call.sptk.many rp=do_fork
diff -urN linux-2.4.18/arch/ia64/kernel/entry.S lia64-2.4/arch/ia64/kernel/entry.S
--- linux-2.4.18/arch/ia64/kernel/entry.S	Mon Nov 26 11:18:20 2001
+++ lia64-2.4/arch/ia64/kernel/entry.S	Tue Apr  9 22:01:38 2002
@@ -115,7 +115,7 @@
 	mov loc1=r16				// save ar.pfs across do_fork
 	.body
 	mov out1=in1
-	mov out3=0
+	mov out3\x16				// stacksize (compensates for 16-byte scratch area)
 	adds out2=IA64_SWITCH_STACK_SIZE+16,sp	// out2 = &regs
 	mov out0=in0				// out0 = clone_flags
 	br.call.sptk.many rp=do_fork
diff -urN linux-2.4.18/arch/ia64/kernel/process.c lia64-2.4/arch/ia64/kernel/process.c
--- linux-2.4.18/arch/ia64/kernel/process.c	Mon Nov 26 11:18:21 2001
+++ lia64-2.4/arch/ia64/kernel/process.c	Tue Feb 26 14:53:42 2002
@@ -235,7 +273,7 @@
 
 	if (user_mode(child_ptregs)) {
 		if (user_stack_base) {
-			child_ptregs->r12 = user_stack_base + user_stack_size;
+			child_ptregs->r12 = user_stack_base + user_stack_size - 16;
 			child_ptregs->ar_bspstore = user_stack_base;
 			child_ptregs->ar_rnat = 0;
 			child_ptregs->loadrs = 0;