This is a note to let you know that I've just added the patch titled btrfs: fix memory leak of fs_info in block group cache to the 4.5-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: btrfs-fix-memory-leak-of-fs_info-in-block-group-cache.patch and it can be found in the queue-4.5 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From aa66b0bb08869d93492bd817d2eae694ca743a3d Mon Sep 17 00:00:00 2001 From: Kinglong Mee <kinglongmee@xxxxxxxxx> Date: Fri, 29 Jan 2016 21:36:00 +0800 Subject: btrfs: fix memory leak of fs_info in block group cache From: Kinglong Mee <kinglongmee@xxxxxxxxx> commit aa66b0bb08869d93492bd817d2eae694ca743a3d upstream. When starting up linux with btrfs filesystem, I got many memory leak messages by kmemleak as, unreferenced object 0xffff880066882000 (size 4096): comm "modprobe", pid 730, jiffies 4294690024 (age 196.599s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8174d52e>] kmemleak_alloc+0x4e/0xb0 [<ffffffff811d09aa>] kmem_cache_alloc_trace+0xea/0x1e0 [<ffffffffa03620fb>] btrfs_alloc_dummy_fs_info+0x6b/0x2a0 [btrfs] [<ffffffffa03624fc>] btrfs_alloc_dummy_block_group+0x5c/0x120 [btrfs] [<ffffffffa0360aa9>] btrfs_test_free_space_cache+0x39/0xed0 [btrfs] [<ffffffffa03b5a74>] trace_raw_output_xfs_attr_class+0x54/0xe0 [xfs] [<ffffffff81002122>] do_one_initcall+0xb2/0x1f0 [<ffffffff811765aa>] do_init_module+0x5e/0x1e9 [<ffffffff810fec09>] load_module+0x20a9/0x2690 [<ffffffff810ff439>] SyS_finit_module+0xb9/0xf0 [<ffffffff81757daf>] entry_SYSCALL_64_fastpath+0x12/0x76 [<ffffffffffffffff>] 0xffffffffffffffff unreferenced object 0xffff8800573f8000 (size 10256): comm "modprobe", pid 730, jiffies 4294690185 (age 196.460s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8174d52e>] kmemleak_alloc+0x4e/0xb0 [<ffffffff8119ca6e>] kmalloc_order+0x5e/0x70 [<ffffffff8119caa4>] kmalloc_order_trace+0x24/0x90 [<ffffffffa03620b3>] btrfs_alloc_dummy_fs_info+0x23/0x2a0 [btrfs] [<ffffffffa03624fc>] btrfs_alloc_dummy_block_group+0x5c/0x120 [btrfs] [<ffffffffa036603d>] run_test+0xfd/0x320 [btrfs] [<ffffffffa0366f34>] btrfs_test_free_space_tree+0x94/0xee [btrfs] [<ffffffffa03b5aab>] trace_raw_output_xfs_attr_class+0x8b/0xe0 [xfs] [<ffffffff81002122>] do_one_initcall+0xb2/0x1f0 [<ffffffff811765aa>] do_init_module+0x5e/0x1e9 [<ffffffff810fec09>] load_module+0x20a9/0x2690 [<ffffffff810ff439>] SyS_finit_module+0xb9/0xf0 [<ffffffff81757daf>] entry_SYSCALL_64_fastpath+0x12/0x76 [<ffffffffffffffff>] 0xffffffffffffffff This patch lets btrfs using fs_info stored in btrfs_root for block group cache directly without allocating a new one. Fixes: d0bd456074 ("Btrfs: add fragment=* debug mount option") Signed-off-by: Kinglong Mee <kinglongmee@xxxxxxxxx> Signed-off-by: David Sterba <dsterba@xxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/btrfs/tests/btrfs-tests.c | 6 ------ fs/btrfs/tests/free-space-tree-tests.c | 1 + 2 files changed, 1 insertion(+), 6 deletions(-) --- a/fs/btrfs/tests/btrfs-tests.c +++ b/fs/btrfs/tests/btrfs-tests.c @@ -189,12 +189,6 @@ btrfs_alloc_dummy_block_group(unsigned l kfree(cache); return NULL; } - cache->fs_info = btrfs_alloc_dummy_fs_info(); - if (!cache->fs_info) { - kfree(cache->free_space_ctl); - kfree(cache); - return NULL; - } cache->key.objectid = 0; cache->key.offset = length; --- a/fs/btrfs/tests/free-space-tree-tests.c +++ b/fs/btrfs/tests/free-space-tree-tests.c @@ -485,6 +485,7 @@ static int run_test(test_func_t test_fun cache->bitmap_low_thresh = 0; cache->bitmap_high_thresh = (u32)-1; cache->needs_free_space = 1; + cache->fs_info = root->fs_info; btrfs_init_dummy_trans(&trans); Patches currently in stable-queue which might be from kinglongmee@xxxxxxxxx are queue-4.5/btrfs-fix-memory-leak-of-fs_info-in-block-group-cache.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html