* [PATCH v2] mm/migrate: Fix ref-count handling when !hugepage_migration_supported()
@ 2017-05-25 13:51 Punit Agrawal
0 siblings, 0 replies; only message in thread
From: Punit Agrawal @ 2017-05-25 13:51 UTC (permalink / raw)
To: Andrew Morton
Cc: Punit Agrawal, will.deacon, catalin.marinas, manoj.iyer,
linux-kernel, linux-arm-kernel, linux-mm, tbaicar, timur,
n-horiguchi, Joonsoo Kim, Wanpeng Li, Christoph Lameter,
# v3 . 14+
On failing to migrate a page, soft_offline_huge_page() performs the
necessary update to the hugepage ref-count. When
!hugepage_migration_supported() , unmap_and_move_hugepage() also
decrements the page ref-count for the hugepage. The combined behaviour
leaves the ref-count in an inconsistent state.
This leads to soft lockups when running the overcommitted hugepage test
from mce-tests suite.
Soft offlining pfn 0x83ed600 at process virtual address 0x400000000000
soft offline: 0x83ed600: migration failed 1, type
1fffc00000008008 (uptodate|head)
INFO: rcu_preempt detected stalls on CPUs/tasks:
Tasks blocked on level-0 rcu_node (CPUs 0-7): P2715
(detected by 7, t=5254 jiffies, g=963, c=962, q=321)
thugetlb_overco R running task 0 2715 2685 0x00000008
Call trace:
[<ffff000008089f90>] dump_backtrace+0x0/0x268
[<ffff00000808a2d4>] show_stack+0x24/0x30
[<ffff000008100d34>] sched_show_task+0x134/0x180
[<ffff0000081c90fc>] rcu_print_detail_task_stall_rnp+0x54/0x7c
[<ffff00000813cfd4>] rcu_check_callbacks+0xa74/0xb08
[<ffff000008143a3c>] update_process_times+0x34/0x60
[<ffff0000081550e8>] tick_sched_handle.isra.7+0x38/0x70
[<ffff00000815516c>] tick_sched_timer+0x4c/0x98
[<ffff0000081442e0>] __hrtimer_run_queues+0xc0/0x300
[<ffff000008144fa4>] hrtimer_interrupt+0xac/0x228
[<ffff0000089a56d4>] arch_timer_handler_phys+0x3c/0x50
[<ffff00000812f1bc>] handle_percpu_devid_irq+0x8c/0x290
[<ffff0000081297fc>] generic_handle_irq+0x34/0x50
[<ffff000008129f00>] __handle_domain_irq+0x68/0xc0
[<ffff0000080816b4>] gic_handle_irq+0x5c/0xb0
Address this by changing the putback_active_hugepage() in
soft_offline_huge_page() to putback_movable_pages().
Reported-by: Manoj Iyer <manoj.iyer@canonical.com>
Suggested-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: <stable@kernel.org> # v3.14+
--
Changes since v1:
* Added stable tag
* Updated patch to use putback_movable_pages() in
soft_offline_huge_page() in place of dropping
putback_active_hugepage() when hugepage migration is not enabled.
This patch was tested on v4.12-rc2 with the series to enable memory
corruption handling[0].
[0] https://www.spinics.net/lists/arm-kernel/msg581657.html
---
mm/memory-failure.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 44a6a33af219..89f9924777fa 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1603,7 +1603,8 @@ static int soft_offline_huge_page(struct page *page, int flags)
* only one hugepage pointed to by hpage, so we need not
* run through the pagelist here.
*/
- putback_active_hugepage(hpage);
+ if (!list_empty(&pagelist))
+ putback_movable_pages(&pagelist);
if (ret > 0)
ret = -EIO;
} else {
--
2.11.0
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