[Bug 108464] System fails to reboot after Ctrl-Alt-Del

[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

            Bug ID: 108464
           Summary: System fails to reboot after Ctrl-Alt-Del
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: duncan_roe@optusnet.com.au

Created attachment 142062
  --> https://bugs.freedesktop.org/attachment.cgi?id=142062&action=edit
kernel config

System shuts down after reboot command or Ctrl-Alt_Del but fails to actually
reboot. The last line output to the Virtual Console is "Rebooting". The screen
then turns off as normal, but fails to turn on again with the boot menu.
Bisection finds this problem is introduced by commit
0a1d56599b9bb58464a8bf1243191eb32b36b694 which patches
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
Hardware: as documented in Bug 108139

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |harry.wentland@amd.com,
                   |                            |sunpeng.li@amd.com

--- Comment #1 from Alex Deucher <alexdeucher@gmail.com> ---
Are you sure the bisect is correct?  This commit just changes debugfs which
shouldn't be triggered unless you actually write to the file in question. 
Please attach your xorg log (is using X) and dmesg output.

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #2 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Yes I thought that was weird (debug fs). But adjacent commit
30cdbfaa6aa469347db7fcda5949f1ccf7559ecf does not show the problem

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #3 from Duncan Roe <duncan_roe@optusnet.com.au> ---
halt is fine btw, it's only reboot that breaks.
Do you want extra debug turned on for dmesg?

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #4 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 142063
  --> https://bugs.freedesktop.org/attachment.cgi?id=142063&action=edit
dmesg o/p as requested

No Xorg involvement - boot up to command line only

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #5 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Still present at 4.19.0-rc8. Is there any other info I can provide?

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #6 from Duncan Roe <duncan_roe@optusnet.com.au> ---
(In reply to Duncan Roe from comment #3)
> halt is fine btw, it's only reboot that breaks.
> Do you want extra debug turned on for dmesg?

At Linux 19.0-rc8, power button / halt command also fails. The backlight goes
off but the power stays on.

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 548 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #7 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Duncan Roe from comment #6)
> (In reply to Duncan Roe from comment #3)
> > halt is fine btw, it's only reboot that breaks.
> > Do you want extra debug turned on for dmesg?
> 
> At Linux 19.0-rc8, power button / halt command also fails. The backlight
> goes off but the power stays on.

Can you bisect that?  Is it the same commit?

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #8 from Duncan Roe <duncan_roe@optusnet.com.au> ---
(In reply to Alex Deucher from comment #1)
> Are you sure the bisect is correct?  This commit just changes debugfs which
> shouldn't be triggered unless you actually write to the file in question. 
> Please attach your xorg log (is using X) and dmesg output.

No longer sure about that. I had been bisecting in
anongit.freedesktop.org/drm/drm. When I switched to
git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git, both 0a1d565 and
30cdbfa show the problem. So I can now try to bisect further.

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #9 from Duncan Roe <duncan_roe@optusnet.com.au> ---
(In reply to Alex Deucher from comment #7)
> (In reply to Duncan Roe from comment #6)
> > (In reply to Duncan Roe from comment #3)
> > > halt is fine btw, it's only reboot that breaks.
> > > Do you want extra debug turned on for dmesg?
> > 
> > At Linux 19.0-rc8, power button / halt command also fails. The backlight
> > goes off but the power stays on.
> 
> Can you bisect that?  Is it the same commit?

It is the same commit i.e. 0a1d565 built from the stable tree consistently
fails to power off. 30cdbfa *sometimes* fails to power off - I think I have
seen 2 fails in6 reboots (my spreadsheet isn't set up to count results (yet)).

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #10 from Duncan Roe <duncan_roe@optusnet.com.au> ---
(In reply to Alex Deucher from comment #1)
> Are you sure the bisect is correct?  This commit just changes debugfs which
> shouldn't be triggered unless you actually write to the file in question. 
> Please attach your xorg log (is using X) and dmesg output.

A fresh bisect in the stable tree has given a new pair of commits.
e1cb3e4801e6896ba93d63222b1052199d2a8c9b has the problem and
899e2aaddbfa0ff96fbaf31f0d9e91427e87dd88 does not have it. (In the stable tree,
30cdbfaa6aa469347db7fcda5949f1ccf7559ecf also has the problem, unlike in the
drm tree that I bisected previously).
A diff of the new commit pair shows 14 patched files. These are TODO, Makefile
and a mixture of .c and .h sources. I am unsure how to proceed with bisecting
these diffs: advice welcome.

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 394 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #11 from Duncan Roe <duncan_roe@optusnet.com.au> ---
There is a kernel Oops associated with this problem. I only just discovered it
started on the same commit as reboot failure did. You can see the BUG line in
attachment 142063 at time 5.075194

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 506 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #12 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 142354
  --> https://bugs.freedesktop.org/attachment.cgi?id=142354&action=edit
Patch for Linux-19.0 to revert e1cb3e4

Revert commit e1cb3e4801e6896ba93d63222b1052199d2a8c9b (drm/amd/display:
Convert remaining loggers off dc_logger).
Reboot works again and the BUG / Oops is gone.

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 514 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #13 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 143007
  --> https://bugs.freedesktop.org/attachment.cgi?id=143007&action=edit
Diagnostic patches to determine which pointer is null

These patches are against Linux 4.19.12, commit
2a7cb228d29c3882c1414c10a44c5f3f59bfa44d in
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 733 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #14 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 143008
  --> https://bugs.freedesktop.org/attachment.cgi?id=143008&action=edit
dmesg o/p with attachment 143007

The exception occurs in dc_link_aux_transfer, which is called by
dm_dp_aux_transfer which is the top displayed function on the stack after the
BUG line in attachment 142063. There is no BUG entry with the patch, instead
there is a line
Cowardly refusing to call through null pointer
after which the patch makes dc_link_aux_transfer return -1.
Code somewhere up the stack attempts 2 retries.

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 865 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #15 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Further to attachment 143008: there are lots of calls to dm_dp_aux_transfer
with aux=00000000f0bfdb41, but the first call with aux=0000000074cc4227 fails
(because the aux_engine pointer is NULL). Then a few more calls with
00000000f0bfdb41, 2 more with 0000000074cc4227 and lastly a few with
00000000f0bfdb41 again. Does that pattern jog anyone's memory?
Is anyone else reproducing this bug?
https://bugs.freedesktop.org/show_bug.cgi?id=108139#c5 mentions the name
"Stoney" (chipset(?)) in case that is any help.
If no-one else is reproducing this, what would be the most helpful thing I
could try next? I don't see this behviour in a VM, so can't gdb it.

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 398 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #16 from Harry Wentland <harry.wentland@amd.com> ---
Created attachment 143011
  --> https://bugs.freedesktop.org/attachment.cgi?id=143011&action=edit
[PATCH] drm/amd/display: Limit number of links to num_ddc

Can you see if this patch helps you?

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 407 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #17 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 143055
  --> https://bugs.freedesktop.org/attachment.cgi?id=143055&action=edit
dmesg o/p with diags after applying attachment 143011

The line before the BUG line shows a null pointer

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 965 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #18 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Mixed results on applying this patch.
IN BRIEF: If you could eliminate this second Oops then we can see what works
and what doesn't.
In the meantime with the patch applied to v4.20 in the stable repository:
reboot *sometimes* works. Ctl-Alt-Del w/out logging in seems not to. Log in as
root and issue reboot cmd: no. Well it did work for me a couple of times but I
can't seem to be able to do it again.
Another thing: I boot to command level. If I let the VC time out (backlight
goes off) then I can never wake it again no matter what keys I press. Caps Lock
light goes on and off, so keyboard is still active.
Hopefully this all gets better once there is no Oops.
Attachment 143055 pinpoints the immediate NULL pointer. Again this is a new
aux_engine.

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 548 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #19 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Comment on attachment 143011
  --> https://bugs.freedesktop.org/attachment.cgi?id=143011
[PATCH] drm/amd/display: Limit number of links to num_ddc

Review of attachment 143011:
-----------------------------------------------------------------

Diagnostics show that this patch has no effect because the compared quantities
are always equal

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 357 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #20 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 143344
  --> https://bugs.freedesktop.org/attachment.cgi?id=143344&action=edit
Display connectors_num & res_cap->num_ddc before compare

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 365 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #21 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Restarting investigations at Linux 5.0.0-rc5. Modified attachment 143055 to
check whether the patch would trigger. It never would. New patch is attachment
143344.

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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[-- Attachment #1.1: Type: text/plain, Size: 522 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #22 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Created attachment 143346
  --> https://bugs.freedesktop.org/attachment.cgi?id=143346&action=edit
dmesg o/p showing output from Attachment 143344

This is a typical BUG occurrence. Stack trace looks similar to attachment
143055.
Would it help to add diagnostics as in 143055? Which variables would you want
to see?

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #23 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Here are some notes for anyone trying to reproduce this problem.
By "this problem" I mean failure to reboot after "reboot" command issued.

1. On my system (Slackware, no systemd) I am triggering a reboot by Ctl-Alt-Del
   and this line in /etc/inittab:
   ca::ctrlaltdel:/sbin/shutdown -t5 -r now

2. I am only booting up to the command line (no X).

3. The occurrence of BUG is intermittent. I am seeing it on about 2 reboots in
3.

4. If there is no BUG, the next reboot will be OK.

5. If a user logs in before Ctl-Alt-Del, reboot with BUG still works maybe 90%
   of the time.

6. With BUG present, Ctl-Alt-Del at the login prompt succeeds about 50% of the
   time (measured over 25 reboots). (I put a dmesg command in rc.local to do
this
   test).

With e1cb3e4801 reverted, reboot always works and BUG never shows. Were it not
for that, I would be suspecting a local hardware problem by now

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

--- Comment #24 from Duncan Roe <duncan_roe@optusnet.com.au> ---
(In reply to Duncan Roe from comment #23)
> Here are some notes for anyone trying to reproduce this problem.
> By "this problem" I mean failure to reboot after "reboot" command issued.
> 
> 1. On my system (Slackware, no systemd) I am triggering a reboot by
> Ctl-Alt-Del
>    and this line in /etc/inittab:
>    ca::ctrlaltdel:/sbin/shutdown -t5 -r now
> 
> 2. I am only booting up to the command line (no X).
> 
> 3. The occurrence of BUG is intermittent. I am seeing it on about 2 reboots
> in 3.
> 
> 4. If there is no BUG, the next reboot will be OK.
> 
> 5. If a user logs in before Ctl-Alt-Del, reboot with BUG still works maybe
> 90%
>    of the time.
> 
> 6. With BUG present, Ctl-Alt-Del at the login prompt succeeds about 50% of
> the
>    time (measured over 25 reboots). (I put a dmesg command in rc.local to do
> this
>    test).
> 
> With e1cb3e4 reverted, reboot always works and BUG never shows. Were it
> not for that, I would be suspecting a local hardware problem by now

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[Bug 108464] System fails to reboot after Ctrl-Alt-Del

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=108464

Duncan Roe <duncan_roe@optusnet.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #25 from Duncan Roe <duncan_roe@optusnet.com.au> ---
Since Linux 5.1, I do not see this bug any more.
So I guess it is "fixed".

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