On Sun, Oct 09, 2016 at 03:24:27PM +0800, Wenwei Tao wrote: > Hi, > > I open the Transparent huge page and run the system and hit the bug > in huge_memory.c: > > static void __split_huge_page_refcount(struct page *page) > . > . > . > > /* tail_page->_mapcount cannot change */ > BUG_ON(page_mapcount(page_tail) < 0); > . > . > > In my understanding, the THP's tail page's mapcount is initialized to > -1, page_mapcout(page_tail) should be 0. > Did anyone meet the same issue? > > Thanks. > > 2016-09-28 02:12:08 [810422.485203] ------------[ cut here ]------------ > 2016-09-28 02:12:08 [810422.489974] kernel BUG at mm/huge_memory.c:1187! > 2016-09-28 02:12:08 [810422.494742] invalid opcode: 0000 [#1] SMP > 2016-09-28 02:12:08 [810422.499034] last sysfs file: > /sys/devices/system/cpu/online > 2016-09-28 02:12:08 [810422.504757] CPU 31 > 2016-09-28 02:12:08 [810422.506775] Modules linked in: 8021q garp > bridge stp llc dell_rbu ipmi_devintf ipmi_si ipmi_msghandler bonding > ipv6 microcode dca power_meter ext4 mbcache jbd2 ahci wmi dm_mirror > dm_region_hash dm_log dm_mod > 2016-09-28 02:12:08 [810422.571439] > 2016-09-28 02:12:08 [810422.573088] Pid: 10729, comm: observer > Tainted: G W ---------------- 2.6.32-220.23.2.el6.x86_64 The kernel is already tianted with warning. And that is way to old kernel -- from RHEL 6.2, almost 5 years old. Contact your OS vendor. -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>