[PATCH 5.15 460/913] dax: make sure inodes are flushed before destroy cache

From: Greg Kroah-Hartman
Date: Tue Apr 05 2022 - 16:23:49 EST


From: Tong Zhang <ztong0001@xxxxxxxxx>

[ 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@xxxxxxxxx>
Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Link: https://lore.kernel.org/r/20220212071111.148575-1-ztong0001@xxxxxxxxx
Fixes: 7b6be8444e0f ("dax: refactor dax-fs into a generic provider of 'struct dax_device' instances")
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/dax/super.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index fc89e91beea7..7610e4a9ac4e 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -678,6 +678,7 @@ static int dax_fs_init(void)
static void dax_fs_exit(void)
{
kern_unmount(dax_mnt);
+ rcu_barrier();
kmem_cache_destroy(dax_cache);
}

--
2.34.1