linux-kernel - Re: [LKP] [ext4] e2ae766c1b: BUG:sleeping_function_called_from_invalid_context_at

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Date:   Wed, 14 Dec 2016 11:11:09 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     Jan Kara <jack@...e.cz>
Cc:     "Huang\, Ying" <ying.huang@...el.com>,
        kernel test robot <xiaolong.ye@...el.com>,
        Theodore Ts'o <tytso@....edu>, <linux-nvdimm@...ts.01.org>,
        Dave Chinner <david@...morbit.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        <linux-ext4@...r.kernel.org>, <lkp@...org>
Subject: Re: [LKP] [ext4] e2ae766c1b: BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/rwsem.c

Jan Kara <jack@...e.cz> writes:

> On Tue 13-12-16 09:27:51, Huang, Ying wrote:
>> Jan Kara <jack@...e.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@...el.com>

Best Regards,
Huang, Ying