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SubjectRe: [LKP] [ext4] e2ae766c1b: BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/rwsem.c
Date
Jan Kara <jack@suse.cz> writes:

> On Tue 13-12-16 09:27:51, Huang, Ying wrote:
>> Jan Kara <jack@suse.cz> writes:
>>
>> > On Mon 12-12-16 18:13:21, kernel test robot wrote:
>> >> FYI, we noticed the following commit:
>> >>
>> >> commit: e2ae766c1b030271b5099b25674e2131d1d1e8c1 ("ext4: convert DAX faults to iomap infrastructure")
>> >> https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
>> >>
>> >> in testcase: nvml
>> >> with following parameters:
>> >>
>> >> group: vmem
>> >> test: pmem
>> >> nr_pmem: 1
>> >> fs: ext4
>> >> mount_option: dax
>> >>
>> >>
>> >>
>> >> on test machine: 64 threads Intel(R) Xeon(R) CPU E5-4650 0 @ 2.70GHz with 64G memory
>> >>
>> >> caused below changes:
>> >>
>> >>
>> >> +------------------------------------------------+------------+------------+
>> >> | | 96f8ba3dd6 | e2ae766c1b |
>> >> +------------------------------------------------+------------+------------+
>> >> | boot_successes | 2 | 2 |
>> >> | boot_failures | 2 | 2 |
>> >> | BUG:kernel_hang_in_test_stage | 2 | |
>> >> | WARNING:at_fs/sysfs/dir.c:#sysfs_warn_dup | 0 | 2 |
>> >> | calltrace:parport_pc_init | 0 | 2 |
>> >> | calltrace:SyS_finit_module | 0 | 2 |
>> >> | WARNING:at_lib/kobject.c:#kobject_add_internal | 0 | 2 |
>> >> +------------------------------------------------+------------+------------+
>> >>
>> >>
>> >>
>> >> user :notice: [ 325.592182] vmem_aligned_alloc/TEST1: SETUP (check/pmem/debug)
>> >>
>> >> user :notice: [ 325.603973] vmem_aligned_alloc/TEST1: START: vmem_aligned_alloc
>> >> kern :err : [ 325.608906] BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:51
>> >> kern :err : [ 325.608908] in_atomic(): 1, irqs_disabled(): 0, pid: 24813, name: vmem_aligned_al
>> >> kern :warn : [ 325.608914] CPU: 44 PID: 24813 Comm: vmem_aligned_al Tainted: G O 4.9.0-rc4-00045-ge2ae766 #1
>> >> kern :warn : [ 325.608916] Hardware name: Intel Corporation LH Pass/S4600LH...., BIOS SE5C600.86B.99.02.1047.032320122259 03/23/2012
>> >> kern :warn : [ 325.608922] ffffc9002c1f7be0
>> >> kern :warn : [ 325.608923] ffffffff81466af9
>> >> kern :warn : [ 325.608924] ffff880fea2425c0
>> >
>> > I think this is actually a bug introduced by Ross' PMD support. Attached
>> > patch should fix it. Ross, can you check it please?
>>
>> Hi, Jan
>>
>> Could you provide a git tree commit for me to test it? If you want it
>> to be tested by 0day.
>
> Thanks for the offer! I've pushed out the latest version of my DAX patches
> including the above fix to
>
> git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git dax

The test result of the head and its parent is as follow,

=========================================================================================
compiler/fs/group/kconfig/mount_option/nr_pmem/rootfs/tbox_group/test/testcase:
gcc-6/ext4/vmem/x86_64-rhel-7.2/dax/1/debian-x86_64-2016-08-31.cgz/lkp-sbx04/pmem/nvml

commit:
c6207e9b753f466bc2e41455dc7611869d439d4e
4393b9bdd5043e550f1bcaf7f4e9c413d0088425

c6207e9b753f466b 4393b9bdd5043e550f1bcaf7f4
---------------- --------------------------
fail:runs %reproduction fail:runs
| | |
3:3 -100% :3 dmesg.BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/rwsem.c
3:3 -100% :3 kmsg.in_atomic():#,irqs_disabled():#,pid:#,name:vmem_aligned_al
3:3 -100% :3 kmsg.in_atomic():#,irqs_disabled():#,pid:#,name:vmem_multiple_p

The bug has been fixed. Feel free to add,

Tested-by: "Huang, Ying" <ying.huang@intel.com>

Best Regards,
Huang, Ying

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