Re: [LKP] [lkp] [parallel lookups machinery, part 2] 96352435af: kernel BUG at mm/slab.c:2599!

Huang, Ying
2016-04-18T07:12:51Z

Al Viro <viro@ZenIV.linux.org.uk> writes:

Hi, Viro,

> On Mon, Apr 18, 2016 at 10:08:37AM +0800, Huang, Ying wrote:
>
>> Could you provide a debug branch in your tree for that?
>
> Done - vfs.git#T1 and vfs.git#T2 resp.

The compare result between T1 and T2 is as follow:

=========================================================================================
compiler/kconfig/rootfs/sleep/tbox_group/testcase:
gcc-5/x86_64-allyesdebian/quantal-core-x86_64.cgz/1/vm-vp-quantal-x86_64/boot

commit:
3ab6378a68555a90a11360e2f2d63c9adb4e7101 (T1)
e570d87b645a0bfd80e36df9753faf3598c9fce0 (T2)

3ab6378a68555a90 e570d87b645a0bfd80e36df975
---------------- --------------------------
fail:runs %reproduction fail:runs
| | |
47:47 -100% :3 dmesg.Kernel_panic-not_syncing:Fatal_exception_in_interrupt
47:47 -100% :3 dmesg.RIP:kfree_debugcheck
47:47 -100% :3 dmesg.invalid_opcode:#[##]SMP
47:47 -100% :3 dmesg.kernel_BUG_at_mm/slab.c
7:47 -15% :3 kmsg.APIC_calibration_not_consistent_with_PM-Timer:#ms_instead_of#ms
1:47 -2% :3 kmsg.kfree_debugcheck:out_of_range_ptr#a8h
7:47 -15% :3 kmsg.kfree_debugcheck:out_of_range_ptr#aah
21:47 -45% :3 kmsg.kfree_debugcheck:out_of_range_ptr#ach
1:47 -2% :3 kmsg.kfree_debugcheck:out_of_range_ptr#bah
2:47 -4% :3 kmsg.kfree_debugcheck:out_of_range_ptr#ch
4:47 -9% :3 kmsg.kfree_debugcheck:out_of_range_ptr#eh
11:47 -23% :3 kmsg.kfree_debugcheck:out_of_range_ptr#h

That is, there is same issue for T1, but no such issue for T2.

> How reproducible it is and how certain you are that it's not there on
> the parent commit?

The result is quite stable for tens tests for parents and the first bad
commit.

Best Regards,
Huang, Ying