PAX: size overflow detected in function try_merge_map fs/btrfs/extent_map.c:238 cicus.101_102 max, count: 13, decl: block_len; num: 0; context: extent_map;
CPU: 0 PID: 684 Comm: firefox Not tainted 4.2.6.201511211841-1-grsec #1
Hardware name: MSI MS-7887/Z87I GAMING AC (MS-7887), BIOS V1.3 05/30/2014
 ffffffffa1a04847 15f11840297c4c4f 0000000000000000 ffffffffc0617195
 ffffc9000222b658 ffffffffa15d49e8 000000000000009b ffffffffc06171ab
 ffffc9000222b688 ffffffffa11a6e54 ffff880203c3bda8 ffff880203c3bd10
Call Trace:
 [<ffffffffc0617195>] ? exit_btrfs_fs+0x1cb79/0x342e4 [btrfs]
 [<ffffffffa15d49e8>] dump_stack+0x4c/0x7f
 [<ffffffffc06171ab>] ? exit_btrfs_fs+0x1cb8f/0x342e4 [btrfs]
 [<ffffffffa11a6e54>] report_size_overflow+0x34/0x40
 [<ffffffffc05894d7>] try_merge_map+0x207/0x320 [btrfs]
 [<ffffffffc058982f>] add_extent_mapping+0x11f/0x1a0 [btrfs]
 [<ffffffffc056ff25>] btrfs_get_extent+0x3d5/0xdd0 [btrfs]
 [<ffffffffc058fbca>] ? free_extent_state+0x3a/0x60 [btrfs]
 [<ffffffffc0590aa1>] ? clear_extent_bit+0x351/0x4f0 [btrfs]
 [<ffffffffc0594ed0>] __do_readpage+0x280/0xd20 [btrfs]
 [<ffffffffc056fb50>] ? btrfs_direct_IO+0x3a0/0x3a0 [btrfs]
 [<ffffffffc0595e6c>] __extent_readpages.constprop.25+0x2dc/0x320 [btrfs]
 [<ffffffffa111e41a>] ? __add_to_page_cache_locked+0x1ea/0x250
 [<ffffffffc056fb50>] ? btrfs_direct_IO+0x3a0/0x3a0 [btrfs]
 [<ffffffffc059681d>] extent_readpages+0x19d/0x1f0 [btrfs]
 [<ffffffffc056fb50>] ? btrfs_direct_IO+0x3a0/0x3a0 [btrfs]
 [<ffffffffc056dd35>] btrfs_readpages+0x35/0x50 [btrfs]
 [<ffffffffa112e2eb>] __do_page_cache_readahead+0x1fb/0x290
 [<ffffffffa112201d>] filemap_fault+0x39d/0x410
 [<ffffffffa114c5da>] __do_fault+0x7a/0x110
 [<ffffffffa1151c3a>] handle_mm_fault+0xdba/0x1ad0
 [<ffffffffa10539c6>] __do_page_fault+0x1f6/0x5a0
 [<ffffffffa1053d92>] do_page_fault+0x22/0x30
 [<ffffffffa15dc6f8>] page_fault+0x28/0x30