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authorTong Zhang <ztong0001@gmail.com>2022-02-12 10:11:11 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-04-08 15:40:16 +0300
commitec376f5c11c88c0215d173599db8449cd4196759 (patch)
treef3886095dfd04e7daf70aea843138515126e01b9 /drivers/dax
parent5e6b030ac345033bd9259f7a591c424213247000 (diff)
downloadlinux-ec376f5c11c88c0215d173599db8449cd4196759.tar.xz
dax: make sure inodes are flushed before destroy cache
[ Upstream commit a7e8de822e0b1979f08767c751f6c8a9c1d4ad86 ] 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: 7b6be8444e0f ("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>
Diffstat (limited to 'drivers/dax')
-rw-r--r--drivers/dax/super.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index cadbd0a1a1ef..260a247c60d2 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -723,6 +723,7 @@ static int dax_fs_init(void)
static void dax_fs_exit(void)
{
kern_unmount(dax_mnt);
+ rcu_barrier();
kmem_cache_destroy(dax_cache);
}