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Date: Tue, 18 Jun 2024 10:09:26 +0800
From: "zhaoyang.huang" <zhaoyang.huang@...soc.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Matthew Wilcox
<willy@...radead.org>, <linux-mm@...ck.org>,
<linux-kernel@...r.kernel.org>,
Zhaoyang Huang <huangzhaoyang@...il.com>, <steve.kang@...soc.com>
Subject: [PATCH] mm: fix hard lockup in __split_huge_page
From: Zhaoyang Huang <zhaoyang.huang@...soc.com>
Hard lockup[2] is reported which should be caused by recursive
lock contention of lruvec->lru_lock[1] within __split_huge_page.
[1]
static void __split_huge_page(struct page *page, struct list_head *list,
pgoff_t end, unsigned int new_order)
{
/* lock lru list/PageCompound, ref frozen by page_ref_freeze */
//1st lock here
lruvec = folio_lruvec_lock(folio);
for (i = nr - new_nr; i >= new_nr; i -= new_nr) {
__split_huge_page_tail(folio, i, lruvec, list, new_order);
/* Some pages can be beyond EOF: drop them from page cache */
if (head[i].index >= end) {
folio_put(tail);
__page_cache_release
//2nd lock here
folio_lruvec_relock_irqsave
[2]
[26887.389623] watchdog: Watchdog detected hard LOCKUP on cpu 21
[26887.389682] CPU: 21 PID: 264 Comm: kswapd0 Kdump: loaded Tainted: G
W 6.6.31.el9 #3
[26887.389685] Hardware name: FUJITSU PRIMERGY RX2540 M4/D3384-A1, BIOS
V5.0.0.12 R1.22.0 for D3384-A1x 06/04/2018
[26887.389687] RIP: 0010:native_queued_spin_lock_slowpath+0x6e/0x2c0
[26887.389696] Code: 08 0f 92 c2 8b 45 00 0f b6 d2 c1 e2 08 30 e4 09 d0
a9 00 01 ff ff 0f 85 ea 01 00 00 85 c0 74 12 0f b6 45 00 84 c0 74 0a f3
90 <0f> b6 45 00 84 c0 75 f6 b8 01 00 00 00 66 89 45 00 5b 5d 41 5c 41
[26887.389698] RSP: 0018:ffffb3e587a87a20 EFLAGS: 00000002
[26887.389700] RAX: 0000000000000001 RBX: ffff9ad6c6f67050 RCX:
0000000000000000
[26887.389701] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
ffff9ad6c6f67050
[26887.389703] RBP: ffff9ad6c6f67050 R08: 0000000000000000 R09:
0000000000000067
[26887.389704] R10: 0000000000000000 R11: 0000000000000000 R12:
0000000000000046
[26887.389705] R13: 0000000000000200 R14: 0000000000000000 R15:
ffffe1138aa98000
[26887.389707] FS: 0000000000000000(0000) GS:ffff9ade20340000(0000)
knlGS:0000000000000000
[26887.389708] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[26887.389710] CR2: 000000002912809b CR3: 000000064401e003 CR4:
00000000007706e0
[26887.389711] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[26887.389712] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[26887.389713] PKRU: 55555554
[26887.389714] Call Trace:
[26887.389717] <NMI>
[26887.389720] ? watchdog_hardlockup_check+0xac/0x150
[26887.389725] ? __perf_event_overflow+0x102/0x1d0
[26887.389729] ? handle_pmi_common+0x189/0x3e0
[26887.389735] ? set_pte_vaddr_p4d+0x4a/0x60
[26887.389738] ? flush_tlb_one_kernel+0xa/0x20
[26887.389742] ? native_set_fixmap+0x65/0x80
[26887.389745] ? ghes_copy_tofrom_phys+0x75/0x110
[26887.389751] ? __ghes_peek_estatus.isra.0+0x49/0xb0
[26887.389755] ? intel_pmu_handle_irq+0x10b/0x230
[26887.389756] ? perf_event_nmi_handler+0x28/0x50
[26887.389759] ? nmi_handle+0x58/0x150
[26887.389764] ? native_queued_spin_lock_slowpath+0x6e/0x2c0
[26887.389768] ? default_do_nmi+0x6b/0x170
[26887.389770] ? exc_nmi+0x12c/0x1a0
[26887.389772] ? end_repeat_nmi+0x16/0x1f
[26887.389777] ? native_queued_spin_lock_slowpath+0x6e/0x2c0
[26887.389780] ? native_queued_spin_lock_slowpath+0x6e/0x2c0
[26887.389784] ? native_queued_spin_lock_slowpath+0x6e/0x2c0
[26887.389787] </NMI>
[26887.389788] <TASK>
[26887.389789] __raw_spin_lock_irqsave+0x3d/0x50
[26887.389793] folio_lruvec_lock_irqsave+0x5e/0x90
[26887.389798] __page_cache_release+0x68/0x230
[26887.389801] ? remove_migration_ptes+0x5c/0x80
[26887.389807] __folio_put+0x24/0x60
[26887.389808] __split_huge_page+0x368/0x520
[26887.389812] split_huge_page_to_list+0x4b3/0x570
[26887.389816] deferred_split_scan+0x1c8/0x290
[26887.389819] do_shrink_slab+0x12f/0x2d0
[26887.389824] shrink_slab_memcg+0x133/0x1d0
[26887.389829] shrink_node_memcgs+0x18e/0x1d0
[26887.389832] shrink_node+0xa7/0x370
[26887.389836] balance_pgdat+0x332/0x6f0
[26887.389842] kswapd+0xf0/0x190
[26887.389845] ? balance_pgdat+0x6f0/0x6f0
[26887.389848] kthread+0xee/0x120
[26887.389851] ? kthread_complete_and_exit+0x20/0x20
[26887.389853] ret_from_fork+0x2d/0x50
[26887.389857] ? kthread_complete_and_exit+0x20/0x20
[26887.389859] ret_from_fork_asm+0x11/0x20
[26887.389864] </TASK>
[26887.389865] Kernel panic - not syncing: Hard LOCKUP
[26887.389867] CPU: 21 PID: 264 Comm: kswapd0 Kdump: loaded Tainted: G
W 6.6.31.el9 #3
[26887.389869] Hardware name: FUJITSU PRIMERGY RX2540 M4/D3384-A1, BIOS
V5.0.0.12 R1.22.0 for D3384-A1x 06/04/2018
[26887.389870] Call Trace:
[26887.389871] <NMI>
[26887.389872] dump_stack_lvl+0x44/0x60
[26887.389877] panic+0x241/0x330
[26887.389881] nmi_panic+0x2f/0x40
[26887.389883] watchdog_hardlockup_check+0x119/0x150
[26887.389886] __perf_event_overflow+0x102/0x1d0
[26887.389889] handle_pmi_common+0x189/0x3e0
[26887.389893] ? set_pte_vaddr_p4d+0x4a/0x60
[26887.389896] ? flush_tlb_one_kernel+0xa/0x20
[26887.389899] ? native_set_fixmap+0x65/0x80
[26887.389902] ? ghes_copy_tofrom_phys+0x75/0x110
[26887.389906] ? __ghes_peek_estatus.isra.0+0x49/0xb0
[26887.389909] intel_pmu_handle_irq+0x10b/0x230
[26887.389911] perf_event_nmi_handler+0x28/0x50
[26887.389913] nmi_handle+0x58/0x150
[26887.389916] ? native_queued_spin_lock_slowpath+0x6e/0x2c0
[26887.389920] default_do_nmi+0x6b/0x170
[26887.389922] exc_nmi+0x12c/0x1a0
[26887.389923] end_repeat_nmi+0x16/0x1f
[26887.389926] RIP: 0010:native_queued_spin_lock_slowpath+0x6e/0x2c0
[26887.389930] Code: 08 0f 92 c2 8b 45 00 0f b6 d2 c1 e2 08 30 e4 09 d0
a9 00 01 ff ff 0f 85 ea 01 00 00 85 c0 74 12 0f b6 45 00 84 c0 74 0a f3
90 <0f> b6 45 00 84 c0 75 f6 b8 01 00 00 00 66 89 45 00 5b 5d 41 5c 41
[26887.389931] RSP: 0018:ffffb3e587a87a20 EFLAGS: 00000002
[26887.389933] RAX: 0000000000000001 RBX: ffff9ad6c6f67050 RCX:
0000000000000000
[26887.389934] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
ffff9ad6c6f67050
[26887.389935] RBP: ffff9ad6c6f67050 R08: 0000000000000000 R09:
0000000000000067
[26887.389936] R10: 0000000000000000 R11: 0000000000000000 R12:
0000000000000046
[26887.389937] R13: 0000000000000200 R14: 0000000000000000 R15:
ffffe1138aa98000
[26887.389940] ? native_queued_spin_lock_slowpath+0x6e/0x2c0
[26887.389943] ? native_queued_spin_lock_slowpath+0x6e/0x2c0
[26887.389946] </NMI>
[26887.389947] <TASK>
[26887.389947] __raw_spin_lock_irqsave+0x3d/0x50
[26887.389950] folio_lruvec_lock_irqsave+0x5e/0x90
[26887.389953] __page_cache_release+0x68/0x230
[26887.389955] ? remove_migration_ptes+0x5c/0x80
[26887.389958] __folio_put+0x24/0x60
[26887.389960] __split_huge_page+0x368/0x520
[26887.389963] split_huge_page_to_list+0x4b3/0x570
[26887.389967] deferred_split_scan+0x1c8/0x290
[26887.389971] do_shrink_slab+0x12f/0x2d0
[26887.389974] shrink_slab_memcg+0x133/0x1d0
[26887.389978] shrink_node_memcgs+0x18e/0x1d0
[26887.389982] shrink_node+0xa7/0x370
[26887.389985] balance_pgdat+0x332/0x6f0
[26887.389991] kswapd+0xf0/0x190
[26887.389994] ? balance_pgdat+0x6f0/0x6f0
[26887.389997] kthread+0xee/0x120
[26887.389998] ? kthread_complete_and_exit+0x20/0x20
[26887.390000] ret_from_fork+0x2d/0x50
[26887.390003] ? kthread_complete_and_exit+0x20/0x20
[26887.390004] ret_from_fork_asm+0x11/0x20
[26887.390009] </TASK>
Signed-off-by: Zhaoyang Huang <zhaoyang.huang@...soc.com>
---
mm/huge_memory.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 9859aa4f7553..ea504df46d3b 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2925,7 +2925,9 @@ static void __split_huge_page(struct page *page, struct list_head *list,
folio_account_cleaned(tail,
inode_to_wb(folio->mapping->host));
__filemap_remove_folio(tail, NULL);
+ unlock_page_lruvec(lruvec);
folio_put(tail);
+ folio_lruvec_lock(folio);
} else if (!PageAnon(page)) {
__xa_store(&folio->mapping->i_pages, head[i].index,
head + i, 0);
--
2.25.1
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