Bug 62982
| Summary: | clone2() call not allocating 16 byte scratch stack area | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | Jenna Hall <jenna.s.hall> |
| Component: | kernel | Assignee: | Jason Baron <jbaron> |
| Status: | CLOSED WONTFIX | QA Contact: | Brian Brock <bbrock> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.2 | CC: | knoel |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | ia64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2004-02-03 21:13:17 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
this is 7.2 ia64 bug which is EOL. Closing bug. |
Description of Problem: The clone2() call does not allocate a 16 byte scratch stack area when creating a new thread, as per IA-64 kernel calling convention. Patch (see below) is in 2.4.18 kernel, but Intel requests it be included in patch for upcoming ia64 distro. Version-Release number of selected component (if applicable): IA-64 RH 7.2 How Reproducible: Steps to Reproduce: 1. 2. 3. Actual Results: Stack size passed is 16 bytes less than expected, as per kernel calling convention. Expected Results: Stack size passed includes 16 byte scratch area. Additional Information: Patch: --- arch/ia64/kernel/entry.S~ Thu Jan 24 17:16:06 2002 +++ arch/ia64/kernel/entry.S Sat Feb 9 10:41:59 2002 @@ -115,7 +115,7 @@ mov loc1=r16 // save ar.pfs across do_fork .body mov out1=in1 - mov out3=0 + mov out3=16 // stacksize (compensates for 16-byte scratch area) adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = ®s mov out0=in0 // out0 = clone_flags br.call.sptk.many rp=do_fork --- arch/ia64/ia32/ia32_entry.S~ Mon Nov 19 20:04:55 2001 +++ 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=16 // stacksize (compensates for 16-byte scratch area) adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = ®s zxt4 out0=in0 // out0 = clone_flags br.call.sptk.many rp=do_fork --- arch/ia64/kernel/process.c~ Mon Feb 4 22:38:51 2002 +++ arch/ia64/kernel/process.c Wed Feb 6 21:05:25 2002 @@ -267,7 +267,7 @@ 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;