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--- Comment #1 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 284933
--> https://bugzilla.kernel.org/attachment.cgi?id=284933&action=edit
kernel .config (5.3-rc8, PowerMac G4 DP)
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Christophe Leroy (christophe.leroy@c-s.fr) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |christophe.leroy@c-s.fr
--- Comment #2 from Christophe Leroy (christophe.leroy@c-s.fr) ---
Could you please provide the content of /sys/kernel/debug/kernel_page_tables
together with the dmesg, and also an 'objdump -h' of the failing modules ?
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Erhard F. (erhard_f@mailbox.org) changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #284931|0 |1
is obsolete| |
--- Comment #3 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 284949
--> https://bugzilla.kernel.org/attachment.cgi?id=284949&action=edit
dmesg (5.3-rc8, PowerMac G4 DP)
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--- Comment #4 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 284951
--> https://bugzilla.kernel.org/attachment.cgi?id=284951&action=edit
kernel_page_tables (5.3-rc8, PowerMac G4 DP)
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--- Comment #5 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 284953
--> https://bugzilla.kernel.org/attachment.cgi?id=284953&action=edit
objdump sungem (5.3-rc8, PowerMac G4 DP)
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--- Comment #6 from Christophe Leroy (christophe.leroy@c-s.fr) ---
Aaarrgghhh ! kernel_page_tables addresses are wrong. Ok, I'll manage.
For next time, please apply
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/arch/powerpc/mm/ptdump?h=next-20190904&id=7c7a532ba3fc51bf9527d191fb410786c1fdc73c
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--- Comment #7 from Christophe Leroy (christophe.leroy@c-s.fr) ---
Created attachment 284961
--> https://bugzilla.kernel.org/attachment.cgi?id=284961&action=edit
Manually fixed kernel_page_tables
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--- Comment #8 from Christophe Leroy (christophe.leroy@c-s.fr) ---
You get:
Sep 13 17:43:49 T600 kernel: BUG: Unable to handle kernel data access at
0xfe205150
However this area is properly mapped RW:
0xfe205000-0xfe205fff 0x297d6000 4K rw present
dirty accessed
There must be something wrong with hash table update.
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--- Comment #9 from Erhard F. (erhard_f@mailbox.org) ---
I can apply the patch but how do I apply the manually fixed kernel_page_tables?
Not quite sure how to proceed.
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--- Comment #10 from Christophe Leroy (christophe.leroy@c-s.fr) ---
No no, what I mean by 'manually fixed kernel_page_tables' is that I fixed the
file you attached so that it has the same values as what it would have had with
the patch applied. Don't worry.
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--- Comment #11 from Christophe Leroy (christophe.leroy@c-s.fr) ---
I have carefully reviewed the flushing calls and have not been able to identify
any issue.
Maybe a SMP issue ? Does this problem also happen without CONFIG_SMP ?
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--- Comment #12 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 284991
--> https://bugzilla.kernel.org/attachment.cgi?id=284991&action=edit
dmesg v2 (5.3-rc8 + ptdump patch)
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--- Comment #13 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 284993
--> https://bugzilla.kernel.org/attachment.cgi?id=284993&action=edit
kernel_page_tables v2 (5.3-rc8 + ptdump patch)
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--- Comment #14 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 284995
--> https://bugzilla.kernel.org/attachment.cgi?id=284995&action=edit
objdump firewire-ohci v2 (5.3-rc8 + ptdump patch)
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--- Comment #15 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 284997
--> https://bugzilla.kernel.org/attachment.cgi?id=284997&action=edit
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--- Comment #16 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 284999
--> https://bugzilla.kernel.org/attachment.cgi?id=284999&action=edit
dmesg v3 (5.3-rc8 + ptdump patch, NO SMP)
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--- Comment #17 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 285001
--> https://bugzilla.kernel.org/attachment.cgi?id=285001&action=edit
kernel_page_tables v3 (5.3-rc8 + ptdump patch, NO SMP)
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--- Comment #18 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 285003
--> https://bugzilla.kernel.org/attachment.cgi?id=285003&action=edit
objdump usbcore v3 (5.3-rc8 + ptdump patch, NO SMP)
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--- Comment #19 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 285005
--> https://bugzilla.kernel.org/attachment.cgi?id=285005&action=edit
objdump ohci-hcd v3 (5.3-rc8 + ptdump patch, NO SMP)
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--- Comment #20 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 285007
--> https://bugzilla.kernel.org/attachment.cgi?id=285007&action=edit
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--- Comment #21 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 285009
--> https://bugzilla.kernel.org/attachment.cgi?id=285009&action=edit
objdump ehci-pci v3 (5.3-rc8 + ptdump patch, NO SMP)
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From: bugzilla-daemon @ 2019-09-16 11:20 UTC (permalink / raw)
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--- Comment #22 from Erhard F. (erhard_f@mailbox.org) ---
(In reply to Christophe Leroy from comment #11)
> I have carefully reviewed the flushing calls and have not been able to
> identify any issue.
>
> Maybe a SMP issue ? Does this problem also happen without CONFIG_SMP ?
For my 1st (v2) retest I applied the "powerpc/ptdump: Fix addresses display on
PPC32" patch you linked on top of -rc8.
For my 2nd (v3) retest I applied the patch and disabled SMP in the .config.
As you can see the issue still persists without SMP. Also different
'problematic' modules popup even without SMP.
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From: bugzilla-daemon @ 2019-09-16 11:32 UTC (permalink / raw)
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--- Comment #23 from Christophe Leroy (christophe.leroy@c-s.fr) ---
Thanks. The third one is interesting, as it shows :
Sep 16 12:57:39 T600 kernel: BUG: Unable to handle kernel data access at
0xfe295404
0xfe295000-0xfe295fff 0x00d05000 4K user r present
accessed
So unlike the other cases, this one shows that the area is still read-only and
pointing to the zero shadow area.
Wondering whether for the other ones the area is not allocated to a further
module loader after the failing one.
Are you able to dump kernel_page_tables just after each module load failure
before loading any additional module ?
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From: bugzilla-daemon @ 2019-09-16 12:28 UTC (permalink / raw)
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--- Comment #24 from Christophe Leroy (christophe.leroy@c-s.fr) ---
Do you confirm that the two patches done in the scope of bug #204479 are
included in your config, especially the first one:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/arch/powerpc/mm/kasan/kasan_init_32.c?id=663c0c9496a69f80011205ba3194049bcafd681d
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/arch/powerpc/mm/kasan/kasan_init_32.c?id=45ff3c55958542c3b76075d59741297b8cb31cbb
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Erhard F. (erhard_f@mailbox.org) changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #25 from Erhard F. (erhard_f@mailbox.org) ---
(In reply to Christophe Leroy from comment #24)
> Do you confirm that the two patches done in the scope of bug #204479 are
> included in your config, especially the first one:
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/
> arch/powerpc/mm/kasan/kasan_init_32.
> c?id=663c0c9496a69f80011205ba3194049bcafd681d
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/
> arch/powerpc/mm/kasan/kasan_init_32.
> c?id=45ff3c55958542c3b76075d59741297b8cb31cbb
Ahh, now we are getting closer...
No, I did the testing with a vanilla 5.3-rc8 kernel assuming that
powerpc/kasan: Fix shadow area set up for modules
powerpc/kasan: Fix parallel loading of modules
were already in 5.3-rc8. Now I realize I was wrong.
In -rc8 the latest one (2019-07-31) is:
powerpc/kasan: fix early boot failure on PPC32
The other two patches are dated 2019-08-20 and not in 5.3-rc8 or the newly
released 5.3.
Sorry for the noise! I will close the bug for now and retest as soon as the 2
patches are in 5.4-rcx or 5.3.x. If it still seems valid that time I will
re-open.
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* [Bug 204819] KASAN still got problems loading some modules at boot
2019-09-11 22:47 [Bug 204819] New: KASAN still got problems loading some modules at boot bugzilla-daemon
` (24 preceding siblings ...)
2019-09-16 13:39 ` bugzilla-daemon
@ 2019-09-18 5:54 ` bugzilla-daemon
25 siblings, 0 replies; 27+ messages in thread
From: bugzilla-daemon @ 2019-09-18 5:54 UTC (permalink / raw)
To: linuxppc-dev
https://bugzilla.kernel.org/show_bug.cgi?id=204819
Michael Ellerman (michael@ellerman.id.au) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |michael@ellerman.id.au
--- Comment #26 from Michael Ellerman (michael@ellerman.id.au) ---
If you want to test things that are not quite in mainline you can always try
the "merge" branch of the powerpc tree. That is a merge of master, next and
fixes, so should have any fixes that are in the pipeline.
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