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SubjectRe: [ext4] e2ae766c1b: BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/rwsem.c
On Mon, Dec 12, 2016 at 05:35:18PM +0100, Jan Kara wrote:
> 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?

Yep, that patch looks good. You can add:

Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>

And I turned on CONFIG_DEBUG_ATOMIC_SLEEP in my test config. :)

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