https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #41 from Christophe Leroy (christophe.le...@csgroup.eu) ---
I'm out of office until 06 Nov.
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Erhard F. (erhar...@mailbox.org) changed:
What|Removed |Added
Attachment #300354|0 |1
is obsolete|
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #39 from Erhard F. (erhar...@mailbox.org) ---
No change with 6.4-rc4, only additional data "page_type: 0x()" is
shown:
[...]
pagealloc: memory corruption
06fe3258: 00 00 00 00
CPU: 1
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #38 from Erhard F. (erhar...@mailbox.org) ---
Created attachment 304309
--> https://bugzilla.kernel.org/attachment.cgi?id=304309=edit
kernel .config (6.3.3, PowerMac G4 DP)
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--- Comment #37 from Erhard F. (erhar...@mailbox.org) ---
Created attachment 304308
--> https://bugzilla.kernel.org/attachment.cgi?id=304308=edit
dmesg (6.3.3, KCSAN, PowerMac G4 DP)
Thanks for taking another look into this Christophe!
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #36 from Christophe Leroy (christophe.le...@csgroup.eu) ---
Would be nice to give it a new try with KCSAN enabled.
To get KCSAN on powerpc/32, apply following series:
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #35 from Erhard F. (erhar...@mailbox.org) ---
Created attachment 301640
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kernel .config (6.0-rc2, PowerMac G4 DP)
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Erhard F. (erhar...@mailbox.org) changed:
What|Removed |Added
Attachment #301302|0 |1
is obsolete|
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #33 from Erhard F. (erhar...@mailbox.org) ---
Created attachment 301337
--> https://bugzilla.kernel.org/attachment.cgi?id=301337=edit
dmesg (5.19-rc5, outline KASAN, PowerMac G4 DP)
Re-tested on 5.19-rc5 +
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #32 from Erhard F. (erhar...@mailbox.org) ---
(In reply to Michael Ellerman from comment #30)
> It's a bit of a stab in the dark, but can you try turning preempt off?
>
> ie. CONFIG_PREEMPT_NONE=y
Looks like your intuition was not
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #31 from Erhard F. (erhar...@mailbox.org) ---
(In reply to Michael Ellerman from comment #30)
> It's a bit of a stab in the dark, but can you try turning preempt off?
>
> ie. CONFIG_PREEMPT_NONE=y
Just tested that. Backtrace looks a
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--- Comment #30 from Michael Ellerman (mich...@ellerman.id.au) ---
It's a bit of a stab in the dark, but can you try turning preempt off?
ie. CONFIG_PREEMPT_NONE=y
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Erhard F. (erhar...@mailbox.org) changed:
What|Removed |Added
Attachment #300115|0 |1
is obsolete|
https://bugzilla.kernel.org/show_bug.cgi?id=215389
Erhard F. (erhar...@mailbox.org) changed:
What|Removed |Added
Attachment #300113|0 |1
is obsolete|
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #27 from Erhard F. (erhar...@mailbox.org) ---
I opened a new bug for the stack issue which contains a bit more data.
Hopefully the output is of some help (see bug #216041).
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--- Comment #26 from Christophe Leroy (christophe.le...@csgroup.eu) ---
Note that THREAD_SHIFT is set to 14 when using KASAN:
config THREAD_SHIFT
int "Thread shift" if EXPERT
range 13 15
default "15" if PPC_256K_PAGES
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #25 from Christophe Leroy (christophe.le...@csgroup.eu) ---
The Kernel stack overflow looks odd.
Value of R1 is wrong and LR is NULL. Don't know how we ended up here, but
probably not by a real stack overflow.
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--- Comment #24 from Christophe Leroy (christophe.le...@csgroup.eu) ---
Seems like with Inline KASAN your kernel is far too big compared to what we
support at the time being:
c2468000 T __end_rodata
c280 T __init_begin
c280 T _sinittext
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #23 from Erhard F. (erhar...@mailbox.org) ---
Created attachment 300978
--> https://bugzilla.kernel.org/attachment.cgi?id=300978=edit
kernel .config (5.18-rc6, CONFIG_LOWMEM_SIZE=0x2800, outline KASAN,
PowerMac G4 DP)
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--- Comment #22 from Erhard F. (erhar...@mailbox.org) ---
Created attachment 300977
--> https://bugzilla.kernel.org/attachment.cgi?id=300977=edit
dmesg (5.18-rc6, CONFIG_LOWMEM_SIZE=0x2800, outline KASAN, PowerMac G4 DP)
I increased
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Michael Ellerman (mich...@ellerman.id.au) changed:
What|Removed |Added
Status|NEW |ASSIGNED
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #20 from Erhard F. (erhar...@mailbox.org) ---
DEBUG_STACKOVERFLOW and KFENCE have been enabled already in the builds I did
here (see kernel attached kernel .config here).
However if I enable (inline) KASAN the kernel won't boot at
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #19 from Christophe Leroy (christophe.le...@csgroup.eu) ---
Yes KASAN can bring some additional inputs.
Maybe start with CONFIG_KFENCE, it is lighter than KASAN.
For the above problem, maybe CONFIG_DEBUG_STACKOVERFLOW can help.
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--- Comment #18 from Erhard F. (erhar...@mailbox.org) ---
Ok, and another problem during building via distcc on the G4, still
LOWMEM_SIZE=0x2800 (kernel v5.17.6).
[...]
Oops: Kernel stack overflow, sig: 11 [#1]
BE PAGE_SIZE=4K MMU=Hash SMP
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Erhard F. (erhar...@mailbox.org) changed:
What|Removed |Added
Attachment #300775|0 |1
is obsolete|
https://bugzilla.kernel.org/show_bug.cgi?id=215389
Erhard F. (erhar...@mailbox.org) changed:
What|Removed |Added
Attachment #300774|0 |1
is obsolete|
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #15 from Erhard F. (erhar...@mailbox.org) ---
It definitively still happens with the default values. Can test with the
reduced CONFIG_LOWMEM_SIZE next week and report back.
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--- Comment #14 from Christophe Leroy (christophe.le...@csgroup.eu) ---
Do you mean it still happens with the default values, or it also happens with
the reduced CONFIG_LOWMEM_SIZE ?
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--- Comment #13 from Erhard F. (erhar...@mailbox.org) ---
Created attachment 300775
--> https://bugzilla.kernel.org/attachment.cgi?id=300775=edit
kernel .config (5.18-rc3, PowerMac G4 DP)
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--- Comment #12 from Erhard F. (erhar...@mailbox.org) ---
Created attachment 300774
--> https://bugzilla.kernel.org/attachment.cgi?id=300774=edit
dmesg (5.18-rc3, PowerMac G4 DP)
Another try with running glibc-2.34 testsuite on kernel
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #11 from Erhard F. (erhar...@mailbox.org) ---
(In reply to Christophe Leroy from comment #10)
> I'm wondering whether you could be running out of vmalloc space. I initially
> thought you were using KASAN, but it seems not according to
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #10 from Christophe Leroy (christophe.le...@csgroup.eu) ---
Thanks for the tests.
I'm not surprised that the system doesn't poweroff or reboot without ADB_PMU
because the PMU manages power.
The "neverending build" is maybe because
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #9 from Erhard F. (erhar...@mailbox.org) ---
Created attachment 300354
--> https://bugzilla.kernel.org/attachment.cgi?id=300354=edit
dmesg (5.10-rc2 with ADB_PMU disabled, PowerMac G4 DP)
Took a little time but I double checked the
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #8 from Christophe Leroy (christophe.le...@csgroup.eu) ---
Looking closer, in fact that might be a false positive.
The huge difference with that bad commit is that:
- Before the commit, the kernel is built _without_ CONFIG_VMAP_STACK
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #7 from Christophe Leroy (christophe.le...@csgroup.eu) ---
Interesting ... Though confusing.
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--- Comment #6 from Erhard F. (erhar...@mailbox.org) ---
Created attachment 300318
--> https://bugzilla.kernel.org/attachment.cgi?id=300318=edit
bisect.log
Ok, finally got it. Interesting find:
# git bisect bad
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--- Comment #5 from Erhard F. (erhar...@mailbox.org) ---
Ok, with zswap lzo/zbud I also get this memory corruption on 5.15.13. So most
probably it's not lzo/z3pool but something else. I'll start a bisect then...
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--- Comment #4 from Erhard F. (erhar...@mailbox.org) ---
I was able to easily reproduce this on 5.15.13, however not on 5.16-rc8.
But on 5.16-rc8 I got this the 3rd time I ran the glibc testsuite:
[...]
watchdog: BUG: soft lockup - CPU#1 stuck
https://bugzilla.kernel.org/show_bug.cgi?id=215389
--- Comment #3 from Erhard F. (erhar...@mailbox.org) ---
Bisecting will take some time. I'll report back as soon as I have any findings.
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Christophe Leroy (christophe.le...@csgroup.eu) changed:
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CC|
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--- Comment #1 from Erhard F. (erhar...@mailbox.org) ---
Created attachment 300115
--> https://bugzilla.kernel.org/attachment.cgi?id=300115=edit
kernel .config (5.15.10, PowerMac G4 DP)
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