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
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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
Kconfig	dax: remove CONFIG_DAX_DRIVER	2021-12-04 08:58:51 -08:00
Makefile	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
kmem.c	dax/kmem: use a single static memory group for a single probed unit	2021-09-08 11:50:23 -07:00
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