Re: Fwd: [powerpc/Baremetal]Kernel OOPS while executing memory hotplug on Power8 baremetal

Jens Axboe
2018-06-07T15:40:47Z

On 6/7/18 8:45 AM, Jens Axboe wrote:
> On 6/7/18 4:37 AM, vrbagal1 wrote:
>> On 2018-06-07 13:12, Bart Van Assche wrote:
>>> On Thu, 2018-06-07 at 12:56 +0530, Venkat Rao B wrote:
>>>> On Thursday 07 June 2018 12:46 PM, Bart Van Assche wrote:
>>>>> On Thu, 2018-06-07 at 12:38 +0530, vrbagal1 wrote:
>>>>>> Observing Kernel oops and machine reboots while executing memory hotplug
>>>>>> test case, on Power8 Baremetal machine.
>>>>>>
>>>>>> I see this is introduced some where between rc6 and 4.17.
>>>>>
>>>>> Please provide the exact versions (git commit IDs) of the kernel versions
>>>>> you have tested.
>>>>
>>>> Commit Id ---> 5037be168f
>>>
>>> The reason I was asking for the commit ID is because I saw that
>>> clone_endio()
>>> occurs in the oops which means that the dm driver is involved. An
>>> important fix
>>> for the dm driver went upstream recently, namely d37753540568 ("dm: Use
>>> kzalloc
>>> for all structs with embedded biosets/mempools"). Can you double check
>>> whether
>>> that commit it present in your tree? If it is not present, please
>>> update to the
>>> latest master and retest. If it is present, please report how to
>>> reproduce
>>> this oops to Kent Overstreet, Jens Axboe, linux-block and Mike Snitzer.
>>>
>>> Thanks,
>>>
>>> Bart.
>>
>>
>> Yes, the fix is present in the tree, which I have tested.
>>
>> Steps to reproduce:
>>
>> Step1: Clone and Install avocado git clone
>> https://github.com/avocado-framework/avocado.git
>> Step2: Clone
>> https://github.com/avocado-framework-tests/avocado-misc-tests.git
>> Test case is
>> https://github.com/avocado-framework-tests/avocado-misc-tests/blob/master/memory/memhotplug.py
>> Step3: Command to run the test is avocado run
>> avocado-misc-tests/memory/memhotplug.py
>
> Can you try with the below? Not a fully formed fix since I'd prefer
> if the dm bioset copy stuff was changed instead, but worth a shot.

This is closer to an actual fix, please try that instead.

diff --git a/block/bio.c b/block/bio.c
index 595663e0281a..0616d86b15c6 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1967,6 +1967,21 @@ int bioset_init(struct bio_set *bs,
}
EXPORT_SYMBOL(bioset_init);

+int bioset_init_from_src(struct bio_set *new, struct bio_set *src)
+{
+ unsigned int pool_size = src->bio_pool.min_nr;
+ int flags;
+
+ flags = 0;
+ if (src->bvec_pool.min_nr)
+ flags |= BIOSET_NEED_BVECS;
+ if (src->rescue_workqueue)
+ flags |= BIOSET_NEED_RESCUER;
+
+ return bioset_init(new, pool_size, src->front_pad, flags);
+}
+EXPORT_SYMBOL(bioset_init_from_src);
+
#ifdef CONFIG_BLK_CGROUP

/**
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 98dff36b89a3..20a8d63754bf 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1953,9 +1953,10 @@ static void free_dev(struct mapped_device *md)
kvfree(md);
}

-static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
+static int __bind_mempools(struct mapped_device *md, struct dm_table *t)
{
struct dm_md_mempools *p = dm_table_get_md_mempools(t);
+ int ret = 0;

if (dm_table_bio_based(t)) {
/*
@@ -1982,13 +1983,16 @@ static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
bioset_initialized(&md->bs) ||
bioset_initialized(&md->io_bs));

- md->bs = p->bs;
- memset(&p->bs, 0, sizeof(p->bs));
- md->io_bs = p->io_bs;
- memset(&p->io_bs, 0, sizeof(p->io_bs));
+ ret = bioset_init_from_src(&md->bs, &p->bs);
+ if (ret)
+ goto out;
+ ret = bioset_init_from_src(&md->io_bs, &p->io_bs);
+ if (ret)
+ bioset_exit(&md->bs);
out:
/* mempool bind completed, no longer need any mempools in the table */
dm_table_free_md_mempools(t);
+ return ret;
}

/*
@@ -2033,6 +2037,7 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
struct request_queue *q = md->queue;
bool request_based = dm_table_request_based(t);
sector_t size;
+ int ret;

lockdep_assert_held(&md->suspend_lock);

@@ -2068,7 +2073,11 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
md->immutable_target = dm_table_get_immutable_target(t);
}

- __bind_mempools(md, t);
+ ret = __bind_mempools(md, t);
+ if (ret) {
+ old_map = ERR_PTR(ret);
+ goto out;
+ }

old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));
rcu_assign_pointer(md->map, (void *)t);
@@ -2078,6 +2087,7 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
if (old_map)
dm_sync_table(md);

+out:
return old_map;
}

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 810a8bee8f85..307682ac2f31 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -417,6 +417,7 @@ enum {
extern int bioset_init(struct bio_set *, unsigned int, unsigned int, int flags);
extern void bioset_exit(struct bio_set *);
extern int biovec_init_pool(mempool_t *pool, int pool_entries);
+extern int bioset_init_from_src(struct bio_set *new, struct bio_set *src);

extern struct bio *bio_alloc_bioset(gfp_t, unsigned int, struct bio_set *);
extern void bio_put(struct bio *);

--
Jens Axboe