Tong Zhang 770d42fff1 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>		2022-04-15 14:18:12 +02:00
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pmem	memremap: move dev_pagemap callbacks into a separate structure	2019-07-02 14:32:44 -03:00
Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Makefile	device-dax: "Hotplug" persistent memory for use like normal RAM	2019-02-28 10:41:23 -08:00
bus.c	dax: Fix alloc_dax_region() compile warning	2020-10-01 13:17:15 +02:00
bus.h	dax: Fix alloc_dax_region() compile warning	2020-10-01 13:17:15 +02:00
dax-private.h	dax: Fix alloc_dax_region() compile warning	2020-10-01 13:17:15 +02:00
device.c	device-dax: use the dev_pagemap internal refcount	2019-07-02 14:32:44 -03:00
kmem.c	device-dax: don't leak kernel memory to user space after unloading kmem	2020-05-27 17:46:48 +02:00
super.c	dax: make sure inodes are flushed before destroy cache	2022-04-15 14:18:12 +02:00