From: Sasha Levin <sashal@kernel.org>
To: stable@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Christophe Leroy <christophe.leroy@c-s.fr>,
Michael Ellerman <mpe@ellerman.id.au>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.18 21/45] powerpc/mm: Don't report hugepage tables as memory leaks when using kmemleak
Date: Sun, 4 Nov 2018 08:52:16 -0500 [thread overview]
Message-ID: <20181104135240.88431-21-sashal@kernel.org> (raw)
In-Reply-To: <20181104135240.88431-1-sashal@kernel.org>
From: Christophe Leroy <christophe.leroy@c-s.fr>
[ Upstream commit 803d690e68f0c5230183f1a42c7d50a41d16e380 ]
When a process allocates a hugepage, the following leak is
reported by kmemleak. This is a false positive which is
due to the pointer to the table being stored in the PGD
as physical memory address and not virtual memory pointer.
unreferenced object 0xc30f8200 (size 512):
comm "mmap", pid 374, jiffies 4872494 (age 627.630s)
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:
[<e32b68da>] huge_pte_alloc+0xdc/0x1f8
[<9e0df1e1>] hugetlb_fault+0x560/0x8f8
[<7938ec6c>] follow_hugetlb_page+0x14c/0x44c
[<afbdb405>] __get_user_pages+0x1c4/0x3dc
[<b8fd7cd9>] __mm_populate+0xac/0x140
[<3215421e>] vm_mmap_pgoff+0xb4/0xb8
[<c148db69>] ksys_mmap_pgoff+0xcc/0x1fc
[<4fcd760f>] ret_from_syscall+0x0/0x38
See commit a984506c542e2 ("powerpc/mm: Don't report PUDs as
memory leaks when using kmemleak") for detailed explanation.
To fix that, this patch tells kmemleak to ignore the allocated
hugepage table.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/mm/hugetlbpage.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 8a9a49c13865..a84c410e5090 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -19,6 +19,7 @@
#include <linux/moduleparam.h>
#include <linux/swap.h>
#include <linux/swapops.h>
+#include <linux/kmemleak.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>
@@ -112,6 +113,8 @@ static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp,
for (i = i - 1 ; i >= 0; i--, hpdp--)
*hpdp = __hugepd(0);
kmem_cache_free(cachep, new);
+ } else {
+ kmemleak_ignore(new);
}
spin_unlock(ptl);
return 0;
--
2.17.1
next prev parent reply other threads:[~2018-11-04 14:03 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-04 13:51 [PATCH AUTOSEL 4.18 01/45] mm: thp: fix MADV_DONTNEED vs migrate_misplaced_transhuge_page race condition Sasha Levin
2018-11-04 13:51 ` [PATCH AUTOSEL 4.18 02/45] mm: thp: fix mmu_notifier in migrate_misplaced_transhuge_page() Sasha Levin
2018-11-04 13:51 ` [PATCH AUTOSEL 4.18 03/45] mm: calculate deferred pages after skipping mirrored memory Sasha Levin
2018-11-04 13:51 ` [PATCH AUTOSEL 4.18 04/45] mm/vmstat.c: assert that vmstat_text is in sync with stat_items_size Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 05/45] userfaultfd: allow get_mempolicy(MPOL_F_NODE|MPOL_F_ADDR) to trigger userfaults Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 06/45] mm: don't miss the last page because of round-off error Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 07/45] mm: don't warn about large allocations for slab Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 08/45] powerpc/traps: restore recoverability of machine_check interrupts Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 09/45] powerpc/64/module: REL32 relocation range check Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 10/45] powerpc/mm: Fix page table dump to work on Radix Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 11/45] powerpc/mm: fix always true/false warning in slice.c Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 12/45] drm/amd/display: fix bug of accessing invalid memory Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 13/45] Input: wm97xx-ts - fix exit path Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 14/45] powerpc/Makefile: Fix PPC_BOOK3S_64 ASFLAGS Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 15/45] powerpc/eeh: Fix possible null deref in eeh_dump_dev_log() Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 16/45] tty: check name length in tty_find_polling_driver() Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 17/45] tracing/kprobes: Check the probe on unloaded module correctly Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 18/45] drm/amdgpu/powerplay: fix missing break in switch statements Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 19/45] ARM: imx_v6_v7_defconfig: Select CONFIG_TMPFS_POSIX_ACL Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 20/45] powerpc/nohash: fix undefined behaviour when testing page size support Sasha Levin
2018-11-04 13:52 ` Sasha Levin [this message]
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 22/45] watchdog: lantiq: update register names to better match spec Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 23/45] drm/omap: fix memory barrier bug in DMM driver Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 24/45] iio: adc: at91: fix wrong channel number in triggered buffer mode Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 25/45] iio: adc: at91: fix acking DRDY irq on simple conversions Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 26/45] drm/amd/display: fix gamma not being applied Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 27/45] drm/hisilicon: hibmc: Do not carry error code in HiBMC framebuffer pointer Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 28/45] media: pci: cx23885: handle adding to list failure Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 29/45] media: coda: don't overwrite h.264 profile_idc on decoder instance Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 30/45] iio: adc: imx25-gcq: Fix leak of device_node in mx25_gcq_setup_cfgs() Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 31/45] MIPS: kexec: Mark CPU offline before disabling local IRQ Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 32/45] powerpc/boot: Ensure _zimage_start is a weak symbol Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 33/45] powerpc/memtrace: Remove memory in chunks Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 34/45] MIPS/PCI: Call pcie_bus_configure_settings() to set MPS/MRRS Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 35/45] sc16is7xx: Fix for multi-channel stall Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 36/45] media: tvp5150: fix width alignment during set_selection() Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 37/45] powerpc/selftests: Wait all threads to join Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 38/45] staging:iio:ad7606: fix voltage scales Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 39/45] drm: rcar-du: Update Gen3 output limitations Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 40/45] drm/amdgpu: Fix SDMA TO after GPU reset v3 Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 41/45] staging: most: video: fix registration of an empty comp core_component Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 42/45] 9p locks: fix glock.client_id leak in do_lock Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 43/45] udf: Prevent write-unsupported filesystem to be remounted read-write Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 44/45] ARM: dts: imx6ull: keep IMX6UL_ prefix for signals on both i.MX6UL and i.MX6ULL Sasha Levin
2018-11-04 13:52 ` [PATCH AUTOSEL 4.18 45/45] 9p: clear dangling pointers in p9stat_free Sasha Levin
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