Re: kern/57833: kernel panic on xorg exit

To: gnats-bugs%netbsd.org@localhost, kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/57833: kernel panic on xorg exit
From: Ramiro Aceves <ea1abz%gmail.com@localhost>
Date: Sat, 13 Jan 2024 22:41:49 +0100



El 13/1/24 a las 1:40, David H. Gutteridge escribió:

The following reply was made to PR kern/57833; it has been noted by GNATS.

From: "David H. Gutteridge" <david%gutteridge.ca@localhost>
To: Gnats Bugs <gnats-bugs%netbsd.org@localhost>
Cc: Taylor R Campbell <riastradh%netbsd.org@localhost>
Subject: Re: kern/57833: kernel panic on xorg exit
Date: Fri, 12 Jan 2024 19:37:16 -0500

  On 2024-01-12 17:52, Ramiro Aceves wrote:
  > El 12/1/24 a las 0:05, David H. Gutteridge escribió:
  >
  >> The following reply was made to PR kern/57833; it has been noted by
  >> GNATS.
  >>
  >> From: "David H. Gutteridge" <david%gutteridge.ca@localhost>
  >> To: Taylor R Campbell <riastradh%netbsd.org@localhost>
  >> Cc: gnats-bugs%netbsd.org@localhost
  >> Subject: Re: kern/57833: kernel panic on xorg exit
  >> Date: Thu, 11 Jan 2024 18:04:44 -0500
  >>
  >> --=_79cd473ca3d4e19fbe52c232ee5dd792
  >> Content-Transfer-Encoding: 7bit
  >> Content-Type: text/plain; charset=US-ASCII;
  >> format=flowed
  >> On 2024-01-10 23:37, Taylor R Campbell wrote:
  >>> Can you also try the attached patch, instead of the other one, to see
  >>> what happens?
  >>>
  >>> (This might break things more spectacularly -- I haven't thought
  >>> about
  >>> whether it makes a lot of sense -- but it should at least prevent the
  >>> particular crash you observed, if we ever get that far with it.)
  >> I've supplied a debug log. (It can be found at:
  >> https://www.netbsd.org/~gutteridge/pr57833_debug.log .)
  >> Applying the first (small) patch did not prevent the panics. But the
  >> larger patch did fix the problem for me. There was a slight coding
  >> error with the second patch (wrong label for a goto statement), so it
  >> didn't compile as-is. I've attached a revised patch that fixes that
  >> one
  >> line, should anyone else want to test this.
  >> Thanks,
  >> Dave
  >
  > Hello Dave, thanks for feedback. Here I had the same problem, I applied
  > the patch and could not compile the kernel  because en error in 555
  > line when compiling i915_gem_stolen.c file. I changed
  >
  > goto err;
  >
  > to
  >
  > goto out;
  >
  > (not sure if that is the right fix)

Yes, it is.> File compiled ok. Rebuilt the kernel and I had the same panic the first

  > time abandoned Xorg session.

There must be something different about your hardware than mine here,

  then. (Mine is Intel 945GME.) The patch did work for me, but I guess
  there's more to it.

Do you have a build that includes a netbsd.gdb file? If not, you can

  generate one (e.g., for your patched kernel) by un-commenting the
  line

makeoptions DEBUG="-g"in your kernel config file (I assume GENERIC?) and re-building. The

  extra file should appear.

Then we would have the means to get the other details Taylor is looking

  for here (see the email from Thu, 11 Jan 2024 03:45UTC).

DavePS Sorry I was not able to send you a patch again earlier. GMail is not

  accepting email from my domain, so my email bounced. Evidently my emails
  do make it when funnelled through GNATS.


Hello,

This is the last recorded crash after Taylor's patch and compiling thekernel with debugging symbols ad David suggested:


netbsd-compal# dmesg -M /var/crash/netbsd.7.core -N /var/crash/netbsd.7

...
...
     4.324510] uhid1 at uhidev1 reportid 3: input=2, output=0, feature=0
[    16.564698] wsdisplay0: screen 1 added (default, vt100 emulation)
[    16.564698] wsdisplay0: screen 2 added (default, vt100 emulation)
[    16.564698] wsdisplay0: screen 3 added (default, vt100 emulation)
[    16.564698] wsdisplay0: screen 4 added (default, vt100 emulation)
[   234.752732] uvm_fault(0xc151c400, 0xdd4e8000, 1) -> 0xe
[   234.752732] fatal page fault in supervisor mode

[ 234.752732] trap type 6 code 0 eip 0xc0b02ece cs 0x8 eflags 0x13287cr2 0xdd4e8000 ilevel 0x8 esp 0x4bb1a000

[   234.752732] curlwp 0xc4341600 pid 0 lid 63 lowest kstack 0xdc7e02c0
[   234.752732] panic: trap
[   234.752732] cpu0: Begin traceback...

[ 234.752732]vpanic(c1186d04,dc7e1d7c,dc7e1e38,c012fed8,c1186d04,dc7e1e44,dc7e1e44,3f,dc7e02c0,13287)at netbsd:vpanic+0x196[ 234.752732]panic(c1186d04,dc7e1e44,dc7e1e44,3f,dc7e02c0,13287,dd4e8000,8,4bb1a000,c157e960)at netbsd:panic+0x18

[   234.752732] trap() at netbsd:trap+0xd51
[   234.752732] --- trap (number 6) ---

[ 234.752732]drm_clflush_virt_range(dd4e8000,1000,0,1000,0,0,c147c8c0,dd4e8000,db6ff000,c5c423c0)at netbsd:drm_clflush_virt_range+0x3f[ 234.752732]i915_gem_object_put_pages_phys(c5c15900,c5c222c4,c5c15900,c5c15900,4,dc7e1f48,c06cd688,c5c15900,54,0)at netbsd:i915_gem_object_put_pages_phys+0x15a[ 234.752732]__i915_gem_object_put_pages(c5c15900,54,0,c0c5dd4f,0,0,c3dff878,0,c5c159b0,c5c159ac)at netbsd:__i915_gem_object_put_pages+0x70[ 234.752732]__i915_gem_free_objects(c3dfea1c,c42a2f00,0,0,120,c4341600,c42a2f1c,dc7e1f78,c42a2f04,c42a2f1c)at netbsd:__i915_gem_free_objects+0x104[ 234.752732]linux_workqueue_thread(c42a2f00,1848000,1853000,0,c01005a8,0,0,0,0,0) atnetbsd:linux_workqueue_thread+0xe6

[   234.752732] cpu0: End traceback...

[   234.752732] dumping to dev 0,1 offset 1023
[   234.752732] dump
netbsd-compal#


netbsd-compal# gdb /usr/src/sys/arch/i386/compile/MYKERNEL/netbsd.gdb
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Reading symbols from /usr/src/sys/arch/i386/compile/MYKERNEL/netbsd.gdb...
(gdb) target kvm /var/crash/netbsd.7.core

0xc012d6ed in maybe_dump (howto=260) at../../../../arch/i386/i386/machdep.c:725

725			dumpsys();
(gdb) frame 0

#0 0xc012d6ed in maybe_dump (howto=260) at../../../../arch/i386/i386/machdep.c:725

725			dumpsys();
(gdb) frame 1

#1 cpu_reboot (howto=howto@entry=260, bootstr=bootstr@entry=0x0) at../../../../arch/i386/i386/machdep.c:746

746		maybe_dump(howto);
(gdb) frame 2

#2 0xc0c85e17 in kern_reboot (howto=howto@entry=260,bootstr=bootstr@entry=0x0) at ../../../../kern/kern_reboot.c:73

73		cpu_reboot(howto, bootstr);
(gdb) frame 3

#3 0xc0cbc9d8 in vpanic (fmt=fmt@entry=0xc1186d04 "trap", ap=0xdc7e1d7c"D\036~\334D\036~\334?")

    at ../../../../kern/subr_prf.c:291
291		kern_reboot(bootopt, NULL);
(gdb) frame 4

#4 0xc0cbca91 in panic (fmt=fmt@entry=0xc1186d04 "trap") at../../../../kern/subr_prf.c:208

208		vpanic(fmt, ap);
(gdb) frame 5

#5 0xc012fed8 in trap (frame=0xdc7e1e44) at../../../../arch/i386/i386/trap.c:358

358			panic("trap");
(gdb) frame 6
#6  0xc012529b in alltraps ()
(gdb) frame 7
#7  0xdc7e1e44 in ?? ()
(gdb) frame 8

#8 0xc06cf74c in i915_gem_object_put_pages_phys (obj=<optimized out>,pages=<optimized out>)

    at ../../../../external/bsd/drm2/dist/drm/i915/gem/i915_gem_phys.c:206
206				drm_clflush_virt_range(src, PAGE_SIZE);
(gdb)

#8 0xc06cf74c in i915_gem_object_put_pages_phys (obj=<optimized out>,pages=<optimized out>)

    at ../../../../external/bsd/drm2/dist/drm/i915/gem/i915_gem_phys.c:206
206				drm_clflush_virt_range(src, PAGE_SIZE);
(gdb) info locals
page = 0x40
dst = 0xdb6ff000 "\377\377\377\377\377\377\377\377"
mapping = <optimized out>
src = 0xdd4e8000
i = <optimized out>
dmat = <optimized out>
vaddr = <optimized out>
(gdb) frame 9
#9  0xc06cf1b2 in __i915_gem_object_put_pages (obj=obj@entry=0xc5c15900)
    at ../../../../external/bsd/drm2/dist/drm/i915/gem/i915_gem_pages.c:246
246			obj->ops->put_pages(obj, pages);
(gdb) info locals
pages = <optimized out>
err = <optimized out>
(gdb) frame 10

#10 0xc06cd688 in __i915_gem_free_objects (i915=0xc3dfd004,freed=<optimized out>)at../../../../external/bsd/drm2/dist/drm/i915/gem/i915_gem_object.c:257

257			__i915_gem_object_put_pages(obj);
(gdb) info locals
mmo = <optimized out>
mn = <optimized out>
obj = 0xc5c15900
on = 0x0
wakeref = <optimized out>
(gdb) frame 11

#11 0xc0aef695 in linux_workqueue_thread (cookie=0xc42a2f00) at../../../../external/bsd/common/linux/linux_work.c:455

455					(*func)(work);
(gdb) info locals
func = 0xc06cd7f2 <__i915_gem_free_work>
wq = 0xc42a2f00
q = {0x0, 0xc42a2f24}

marker = {work_owner = 3291047360, work_entry = {tqe_next = 0x0,tqe_prev = 0xc42a2f1c}, func = 0xc42a2f00}

work = 0xc3dfea1c
i = <optimized out>
(gdb) frame 12
#12 0xc0102011 in lwp_trampoline ()
(gdb) info locals
No symbol table info available.
(gdb) frame 13
No frame at level 13.
(gdb)

Ramiro.

References:
- Re: kern/57833: kernel panic on xorg exit
  - From: David H. Gutteridge

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