The patch titled
i386: fix one case of stuck dwarf2 unwinder
has been added to the -mm tree. Its filename is
i386-fix-one-case-of-stuck-dwarf2-unwinder.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: i386: fix one case of stuck dwarf2 unwinder
From: Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx>
When the dwarf2 unwinder does its thing, sometimes it ends up in kernel
startup code in head.S. Changing arch_unw_user_mode() to treat that case
as if it were user mode is the easy fix.
Signed-off-by: Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/asm-i386/unwind.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN include/asm-i386/unwind.h~i386-fix-one-case-of-stuck-dwarf2-unwinder include/asm-i386/unwind.h
--- a/include/asm-i386/unwind.h~i386-fix-one-case-of-stuck-dwarf2-unwinder
+++ a/include/asm-i386/unwind.h
@@ -71,13 +71,14 @@ extern asmlinkage int arch_unwind_init_r
void *arg),
void *arg);
+extern void stext(void); /* real start of kernel text */
static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
{
#if 0 /* This can only work when selector register and EFLAGS saves/restores
are properly annotated (and tracked in UNW_REGISTER_INFO). */
return user_mode_vm(&info->regs);
#else
- return info->regs.eip < PAGE_OFFSET
+ return info->regs.eip < (unsigned long)stext
|| (info->regs.eip >= __fix_to_virt(FIX_VDSO)
&& info->regs.eip < __fix_to_virt(FIX_VDSO) + PAGE_SIZE)
|| info->regs.esp < PAGE_OFFSET;
_
Patches currently in -mm which might be from 76306.1226@xxxxxxxxxxxxxx are
ptrace-make-pid-of-child-process-available-for.patch
i386-print-stack-size-in-oops-messages.patch
sleazy-fpu-feature-i386-support.patch
i386-early-fault-handler.patch
i386-fix-recursive-faults-during-oops-when-current.patch
i386-show_registers-try-harder-to-print-failing.patch
i386-entryserror_code-is-not-safe-for-kprobes.patch
i386-fix-one-case-of-stuck-dwarf2-unwinder.patch
spinlock_debug-dont-recompute-jiffies_per_loop.patch
-
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