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| author | Tong Zhang <ztong0001@gmail.com> | 2022-02-11 23:11:11 -0800 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-02-17 16:57:27 -0800 |
| commit | a7e8de822e0b1979f08767c751f6c8a9c1d4ad86 (patch) | |
| tree | 1a088c761e584d0ce2a2307c5588f69326f0af72 /drivers/dax | |
| parent | c2e8021a535d3e7cc4f5f1418c4acf97589f8eb5 (diff) | |
| download | lwn-a7e8de822e0b1979f08767c751f6c8a9c1d4ad86.tar.gz lwn-a7e8de822e0b1979f08767c751f6c8a9c1d4ad86.zip | |
dax: make sure inodes are flushed before destroy cache
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>
Diffstat (limited to 'drivers/dax')
| -rw-r--r-- | drivers/dax/super.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/dax/super.c b/drivers/dax/super.c index e3029389d809..6bd565fe2e63 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -476,6 +476,7 @@ static int dax_fs_init(void) static void dax_fs_exit(void) { kern_unmount(dax_mnt); + rcu_barrier(); kmem_cache_destroy(dax_cache); } |