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linux-stable/drivers/dax
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Tong Zhang b786abe7c6 dax: make sure inodes are flushed before destroy cache 
[ Upstream commit a7e8de822e ]

A bug can be triggered by following command

$ modprobe nd_pmem && modprobe -r nd_pmem

[   10.060014] BUG dax_cache (Not tainted): Objects remaining in dax_cache on __kmem_cache_shutdown()
[   10.060938] Slab 0x0000000085b729ac objects=9 used=1 fp=0x000000004f5ae469 flags=0x200000000010200(slab|head|node)
[   10.062433] Call Trace:
[   10.062673]  dump_stack_lvl+0x34/0x44
[   10.062865]  slab_err+0x90/0xd0
[   10.063619]  __kmem_cache_shutdown+0x13b/0x2f0
[   10.063848]  kmem_cache_destroy+0x4a/0x110
[   10.064058]  __x64_sys_delete_module+0x265/0x300

This is caused by dax_fs_exit() not flushing inodes before destroy cache.
To fix this issue, call rcu_barrier() before destroy cache.

Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220212071111.148575-1-ztong0001@gmail.com
Fixes: 7b6be8444e ("dax: refactor dax-fs into a generic provider of 'struct dax_device' instances")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-04-08 13:58:07 +02:00
..
hmem dax/hmem: introduce dax_hmem.region_idle parameter 2020-10-13 18:38:28 -07:00
pmem dax: Kill DEV_DAX_PMEM_COMPAT 2021-11-24 19:21:35 -08:00
bus.c Merge branch 'akpm' (patches from Andrew) 2022-01-15 20:37:06 +02:00
bus.h Merge branch 'akpm' (patches from Andrew) 2022-01-15 20:37:06 +02:00
dax-private.h device-dax: add an 'align' attribute 2020-10-13 18:38:28 -07:00
device.c Merge branch 'akpm' (patches from Andrew) 2022-01-15 20:37:06 +02:00
Kconfig dax: remove CONFIG_DAX_DRIVER 2021-12-04 08:58:51 -08:00
kmem.c dax/kmem: use a single static memory group for a single probed unit 2021-09-08 11:50:23 -07:00
Makefile dax: Kill DEV_DAX_PMEM_COMPAT 2021-11-24 19:21:35 -08:00
pmem.c dax: Kill DEV_DAX_PMEM_COMPAT 2021-11-24 19:21:35 -08:00
super.c dax: make sure inodes are flushed before destroy cache 2022-04-08 13:58:07 +02:00