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SubjectRe: [PATCH 1/2] x86/stacktrace: do not fail when regs on stack for ORC
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On 05/10/2018, 02:49 PM, Josh Poimboeuf wrote:
> On Thu, May 10, 2018 at 02:33:03PM +0200, Jiri Slaby wrote:
>> On 04/19/2018, 03:42 PM, Josh Poimboeuf wrote:
>>> On Mon, Apr 16, 2018 at 05:16:53PM -0500, Josh Poimboeuf wrote:
>>>> On Wed, Dec 20, 2017 at 08:07:17PM +0100, Jiri Slaby wrote:
>>>>> On 12/20/2017, 06:45 PM, Josh Poimboeuf wrote:
>>>>>> It might not be until 2018 though. But in the meantime you can go ahead
>>>>>> and update your patches accordingly and then we can combine them for
>>>>>> testing next year.
>>>>>
>>>>> I already did ;). So when you have that ready, I will send it on top
>>>>> right after.
>>>>
>>>> Sorry for the delay... Here's a (lightly tested) patch. Can you test
>>>> it with the latest version of your patches?
>>>
>>> This one actually compiles:
>>>
>>> From: Josh Poimboeuf <jpoimboe@redhat.com>
>>> Subject: [PATCH] x86/unwind/orc: Detect the end of the stack
>>
>> With this patch applied, livepatching never completes. Kthreads are in
>> the unpatched state forever. I have no details yet.
>
> Hm, I thought I had tested that, but now I'm not sure. Let me try it
> again.

We need to propagate end from hints to orcs. This works for me™:

commit ad05e939b5809db104528731ed0147ad59466db5
Author: Jiri Slaby <jslaby@suse.cz>
Date: Fri May 11 09:00:12 2018 +0200

objtool: take end hint into account

Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 5409f6f..fef15ce 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1109,6 +1109,7 @@ static int read_unwind_hints(struct objtool_file
*file)

cfa->offset = hint->sp_offset;
insn->state.type = hint->type;
+ insn->state.end = hint->end;
}

return 0;
diff --git a/tools/objtool/check.h b/tools/objtool/check.h
index c6b68fc..000ecf3 100644
--- a/tools/objtool/check.h
+++ b/tools/objtool/check.h
@@ -30,6 +30,7 @@ struct insn_state {
struct cfi_reg regs[CFI_NUM_REGS];
int stack_size;
unsigned char type;
+ unsigned char end;
bool bp_scratch;
bool drap;
int drap_reg, drap_offset;
diff --git a/tools/objtool/orc_dump.c b/tools/objtool/orc_dump.c
index c334382..a9bf1861 100644
--- a/tools/objtool/orc_dump.c
+++ b/tools/objtool/orc_dump.c
@@ -203,7 +203,9 @@ int orc_dump(const char *_objname)

print_reg(orc[i].bp_reg, orc[i].bp_offset);

- printf(" type:%s\n", orc_type_name(orc[i].type));
+ printf(" type:%s", orc_type_name(orc[i].type));
+
+ printf(" end:%u\n", orc[i].end);
}

elf_end(elf);
diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c
index 18384d9..f413cc2 100644
--- a/tools/objtool/orc_gen.c
+++ b/tools/objtool/orc_gen.c
@@ -31,6 +31,9 @@ int create_orc(struct objtool_file *file)
struct cfi_reg *cfa = &insn->state.cfa;
struct cfi_reg *bp = &insn->state.regs[CFI_BP];

+ //if (insn->hint)
+ orc->end = insn->state.end;
+
if (cfa->base == CFI_UNDEFINED) {
orc->sp_reg = ORC_REG_UNDEFINED;
continue;
thanks,
--
js
suse labs

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