[Bug 204407] New: Bad page state in process Xorg

[Petr Vandrovec]

Andrew Morton wrote on 8/2/2019 1:23 PM:
> (switched to email.  Please respond via emailed reply-to-all, not via the
> bugzilla web interface).
> 
> On Thu, 01 Aug 2019 22:34:16 +0000 bugzilla-daemon at bugzilla.kernel.org wrote:
> 
>> [259701.549382] Code: 10 e9 67 ff ff ff 0f 1f 44 00 00 48 8b 15 b1 6c 0c 00 f7
>> d8 64 89 02 48 c7 c0 ff ff ff ff e9 6b ff ff ff b8 0b 00 00 00 0f 05 <48> 3d 01
>> f0 ff ff 73 01 c3 48 8b 0d 89 6c 0c 00 f7 d8 64 89 01 48
>> [259701.549382] RSP: 002b:00007ffe529db138 EFLAGS: 00000206 ORIG_RAX:
>> 000000000000000b
>> [259701.549382] RAX: ffffffffffffffda RBX: 0000564a5eabce70 RCX:
>> 00007f504d0ec1d7
>> [259701.549382] RDX: 00007ffe529db140 RSI: 0000000000400000 RDI:
>> 00007f5044b65000
>> [259701.549382] RBP: 0000564a5eafe460 R08: 000000000000000b R09:
>> 000000010283e000
>> [259701.549382] R10: 0000000000000001 R11: 0000000000000206 R12:
>> 0000564a5e475b08
>> [259701.549382] R13: 0000564a5e475c80 R14: 00007ffe529db190 R15:
>> 0000000000000c80
>> [259701.707238] Disabling lock debugging due to kernel taint
> 
> I assume the above is misbehaviour in the DRM code?

Most probably.

When I switched back to 5.2, crashes were gone, but log was filled with 
11 millions of messages complaining about alloc_contig_range problems:

[22042.108043] alloc_contig_range: [106f118, 106f119) PFNs busy
[22042.114400] alloc_contig_range: [106f11c, 106f11d) PFNs busy
[22042.120787] alloc_contig_range: [106f11d, 106f11e) PFNs busy
[22047.093057] alloc_contig_range: 47963 callbacks suppressed
[22047.093058] alloc_contig_range: [106f117, 106f118) PFNs busy
[22047.105576] alloc_contig_range: [106f118, 106f119) PFNs busy
[22047.111937] alloc_contig_range: [106f11c, 106f11d) PFNs busy
[22047.118329] alloc_contig_range: [106f11d, 106f11e) PFNs busy

In total there is 9735 messages logged individually, and 11 million 
suppressed:

petr-dev3:~$ dmesg | grep alloc_contig.*PFNs | wc -l
9735
petr-dev3:~$ expr `echo \`dmesg | grep alloc_contig.*callbacks | cut -d' 
' -f3\` | sed -e 's/ / + /'g`
11333722

So it could be my problems are caused by new Xorg driver.

After I disabled CMA system is stable on 5.2.  I did not try 5.3-rc2 yet.

Petr