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SubjectRe: [LKP] [lkp-robot] [confidence: ] 7757d607c6 [ 56.996267] BUG: Bad page map in process trinity-c2 pte:0d755065 pmd:0d55b067
Hi,

On 07/27, Joerg Roedel wrote:
>Hey,
>
>thanks for the report! It did a lot of testing and the issue is fixed
>now with this patch:
>
> https://lore.kernel.org/lkml/1532533683-5988-4-git-send-email-joro@8bytes.org/
>
>I did 2150 runs of your reproducer with the reproducer attached to this
>report, and the issue triggered three times.
>
>With the patch above the issue did not trigger anymore in (up to now)
>2170 runs of the reproducer.
>
>On Sat, Jul 21, 2018 at 10:23:25AM +0800, kernel test robot wrote:
>> git bisect start 8c934e01a7ce685d98e970880f5941d79272c654 37b5dca2898d1471729194f45e281c2443eb9d6c --
>> git bisect good 8372d66865deb45ee3ec21401a9c80f231b728c8 # 23:36 G 304 0 4 4 x86/pgtable: Move pgdp kernel/user conversion functions to pgtable.h
>> git bisect good b976690f5db26fbc7c2be413bfa0fbd270547a94 # 00:10 G 305 0 5 5 x86/mm/pti: Introduce pti_finalize()
>> git bisect good 9bae3197e15dd5e03ce8e237db6fe4486b08a775 # 00:49 G 308 0 3 4 x86/ldt: Split out sanity check in map_ldt_struct()
>> git bisect bad 5e8105950a8b3e03e805299b4d05020ee4eda31a # 01:12 B 131 1 4 4 x86/mm/pti: Add Warning when booting on a PCID capable CPU
>> git bisect good 6df934b92a549cb3badb6d576f71aeb133e2f110 # 01:47 G 310 0 7 10 x86/ldt: Enable LDT user-mapping for PAE
>> git bisect bad 7757d607c6b31867777de42e1fb0210b9c5d8b70 # 02:08 B 134 1 2 2 x86/pti: Allow CONFIG_PAGE_TABLE_ISOLATION for x86_32
>> # first bad commit: [7757d607c6b31867777de42e1fb0210b9c5d8b70] x86/pti: Allow CONFIG_PAGE_TABLE_ISOLATION for x86_32
>> git bisect good 6df934b92a549cb3badb6d576f71aeb133e2f110 # 03:14 G 900 0 9 19 x86/ldt: Enable LDT user-mapping for PAE
>> # extra tests on HEAD of tip/x86/pti
>> git bisect bad 8c934e01a7ce685d98e970880f5941d79272c654 # 03:15 B 279 2 0 6 x86/pti: Check the return value of pti_user_pagetable_walk_pmd()
>> # extra tests on tree/branch tip/x86/pti
>> git bisect bad 8c934e01a7ce685d98e970880f5941d79272c654 # 03:20 B 279 2 0 6 x86/pti: Check the return value of pti_user_pagetable_walk_pmd()
>> # extra tests with first bad commit reverted
>> git bisect good 90d0ce801fac8115d424e40a4a258aeed0e409dd # 03:58 G 302 0 7 7 Revert "x86/pti: Allow CONFIG_PAGE_TABLE_ISOLATION for x86_32"
>> # extra tests on tree/branch tip/master
>> git bisect bad 4edd5aa38cec47346e0d0a85fa43964828b982d0 # 04:37 B 257 1 5 6 Merge branch 'linus'
>
>May I ask how this was bisected? I found it very hard to reproduce, it
>triggered less then two times a day with the attached reproducer. Given
>that the report came pretty fast after the patches landed in
>tip/x86/pti, I guess it triggered a lot faster in your testing.
>

There is higher reproduce rate (2/310) in 0day environment, and we got dozens
of qemu running simultaneously for bisection thus can get bisect result promptly.

Thanks,
Xiaolong

>Regards,
>
> Joerg
>
>_______________________________________________
>LKP mailing list
>LKP@lists.01.org
>https://lists.01.org/mailman/listinfo/lkp

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