Fix "kmem -n|-p" options display wrong values
Release crash-7.3.0-3 Resolves: rhbz#1975621 Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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Lianbo Jiang
parent
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From 0b5435e10161345cf713ed447a155a611a1b408b Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio-ab@nec.com>
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Date: Wed, 26 May 2021 17:33:13 +0900
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Subject: [PATCH 1/2] memory: Add support for SECTION_TAINT_ZONE_DEVICE flag
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Fix for "kmem -n|-p" options on Linux 5.12-rc1 and later kernels
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that contain commit 1f90a3477df3f ("mm: teach pfn_to_online_page()
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about ZONE_DEVICE section collisions"). Without the patch, the
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"kmem -n" option incorrectly shows mem_map addresses containing the
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flag in bit 5 as part of the virtual address, and also the "kmem -p"
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option shows page structures at wrong position. With the patch,
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the "kmem -n" option displays the new "D" state flag.
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Without the patch:
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crash> kmem -n
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...
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NR SECTION CODED_MEM_MAP MEM_MAP STATE PFN
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1040 ffff9edf3ffd4100 ffffe2bcc0000010 ffffe2bd42000010 PMOE 34078720
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^ ^
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crash> kmem -p
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PAGE PHYSICAL MAPPING INDEX CNT FLAGS
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ffffe2bd42000010 2080000000 400040 1ffffffff 9961471 dead000000000122 referenced,active,error
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ffffe2bd42000050 2080001000 800080 1ffffffff 9961471 dead000000000122 referenced,active,error
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ffffe2bd42000090 2080002000 0 1ffffffff 9961471 dead000000000122 referenced,active,error
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^^
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With the patch:
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crash> kmem -n
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...
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NR SECTION CODED_MEM_MAP MEM_MAP STATE PFN
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1040 ffff9edf3ffd4100 ffffe2bcc0000000 ffffe2bd42000000 PMOED 34078720
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crash> kmem -p
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PAGE PHYSICAL MAPPING INDEX CNT FLAGS
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ffffe2bd42000000 2080000000 ffff9ebfc0044100 0 1 97ffffc0000200 slab
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ffffe2bd42000040 2080001000 ffff9ebfc0044400 0 1 97ffffc0000200 slab
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ffffe2bd42000080 2080002000 0 0 1 97ffffc0000000
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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---
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help.c | 11 +++++++----
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memory.c | 15 +++++++++------
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2 files changed, 16 insertions(+), 10 deletions(-)
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diff --git a/help.c b/help.c
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index e0c84087add3..9649cc81fa36 100644
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--- a/help.c
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+++ b/help.c
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@@ -6584,10 +6584,13 @@ char *help_kmem[] = {
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" kernels, the vm_zone_stat, vm_node_stat and vm_numa_stat tables,",
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" the cumulative page_states counter values if they exist, and/or ",
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" the cumulative, vm_event_states counter values if they exist.",
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-" -n display memory node, memory section, and memory block data",
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-" and state; the state of each memory section state is encoded",
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-" as \"P\", \"M\", \"O\" and/or \"E\", meaning SECTION_MARKED_PRESENT,",
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-" SECTION_HAS_MEM_MAP, SECTION_IS_ONLINE and SECTION_IS_EARLY.",
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+" -n display memory node, memory section, memory block data and state;",
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+" the state of each memory section is shown as the following flags:",
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+" \"P\": SECTION_MARKED_PRESENT",
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+" \"M\": SECTION_HAS_MEM_MAP",
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+" \"O\": SECTION_IS_ONLINE",
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+" \"E\": SECTION_IS_EARLY",
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+" \"D\": SECTION_TAINT_ZONE_DEVICE",
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" -z displays per-zone memory statistics.",
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" -o displays each cpu's offset value that is added to per-cpu symbol",
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" values to translate them into kernel virtual addresses.",
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diff --git a/memory.c b/memory.c
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index a3cf8a86728d..2c4f9790f498 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -17270,12 +17270,13 @@ nr_to_section(ulong nr)
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* which results in PFN_SECTION_SHIFT equal 6.
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* To sum it up, at least 6 bits are available.
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*/
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-#define SECTION_MARKED_PRESENT (1UL<<0)
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-#define SECTION_HAS_MEM_MAP (1UL<<1)
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-#define SECTION_IS_ONLINE (1UL<<2)
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-#define SECTION_IS_EARLY (1UL<<3)
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-#define SECTION_MAP_LAST_BIT (1UL<<4)
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-#define SECTION_MAP_MASK (~(SECTION_MAP_LAST_BIT-1))
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+#define SECTION_MARKED_PRESENT (1UL<<0)
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+#define SECTION_HAS_MEM_MAP (1UL<<1)
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+#define SECTION_IS_ONLINE (1UL<<2)
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+#define SECTION_IS_EARLY (1UL<<3)
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+#define SECTION_TAINT_ZONE_DEVICE (1UL<<4)
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+#define SECTION_MAP_LAST_BIT (1UL<<5)
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+#define SECTION_MAP_MASK (~(SECTION_MAP_LAST_BIT-1))
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int
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@@ -17373,6 +17374,8 @@ fill_mem_section_state(ulong state, char *buf)
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bufidx += sprintf(buf + bufidx, "%s", "O");
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if (state & SECTION_IS_EARLY)
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bufidx += sprintf(buf + bufidx, "%s", "E");
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+ if (state & SECTION_TAINT_ZONE_DEVICE)
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+ bufidx += sprintf(buf + bufidx, "%s", "D");
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}
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void
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--
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2.30.2
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@ -0,0 +1,48 @@
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From ec44b902d3467e7b86ee39e2d7d472b9cb202148 Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio-ab@nec.com>
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Date: Mon, 31 May 2021 14:08:28 +0900
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Subject: [PATCH 2/2] memory: Fix for "kmem -n" option to display NID correctly
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The nid member of struct memory_block is a 4-byte integer, but read
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and printed as a 8-byte integer on 64-bit machines. Without the
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patch, the option displays wrong NIDs.
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crash> kmem -n
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...
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MEM_BLOCK NAME PHYSICAL RANGE NODE STATE START_SECTION_NO
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ffff9edeff2b9400 memory0 0 - 7fffffff 14195095130662240256 ONLINE 0
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ffff9edeff2bb400 memory2 100000000 - 17fffffff 14195094718345379840 ONLINE 32
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The issue seems to appear on Linux 5.12 and later kernels that contain
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commit e9a2e48e8704c ("drivers/base/memory: don't store phys_device
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in memory blocks"), which changed the arrangement of the members of
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struct memory_block.
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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---
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memory.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/memory.c b/memory.c
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index 2c4f9790f498..cbe90eebe748 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -17568,13 +17568,13 @@ print_memory_block(ulong memory_block)
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if (MEMBER_EXISTS("memory_block", "nid")) {
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readmem(memory_block + OFFSET(memory_block_nid), KVADDR, &nid,
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- sizeof(void *), "memory_block nid", FAULT_ON_ERROR);
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+ sizeof(int), "memory_block nid", FAULT_ON_ERROR);
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fprintf(fp, " %s %s %s %s %s %s\n",
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mkstring(buf1, VADDR_PRLEN, LJUST|LONG_HEX,
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MKSTR(memory_block)),
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mkstring(buf2, 12, CENTER, name),
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parangebuf,
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- mkstring(buf5, strlen("NODE"), CENTER|LONG_DEC,
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+ mkstring(buf5, strlen("NODE"), CENTER|INT_DEC,
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MKSTR(nid)),
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mkstring(buf6, strlen("OFFLINE"), LJUST,
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statebuf),
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--
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2.30.2
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@ -4,7 +4,7 @@
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Summary: Kernel analysis utility for live systems, netdump, diskdump, kdump, LKCD or mcore dumpfiles
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Name: crash
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Version: 7.3.0
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Release: 2%{?dist}
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Release: 3%{?dist}
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License: GPLv3
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Source0: https://github.com/crash-utility/crash/archive/crash-%{version}.tar.gz
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Source1: http://ftp.gnu.org/gnu/gdb/gdb-7.6.tar.gz
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@ -19,6 +19,8 @@ Provides: bundled(libiberty)
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Provides: bundled(gdb) = 7.6
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Patch0: lzo_snappy.patch
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Patch1: 0001-Fix-for-kmem-s-S-option-on-Linux-5.7-and-later-kerne.patch
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Patch2: 0001-memory-Add-support-for-SECTION_TAINT_ZONE_DEVICE-fla.patch
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Patch3: 0002-memory-Fix-for-kmem-n-option-to-display-NID-correctl.patch
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%description
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The core analysis suite is a self-contained tool that can be used to
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@ -40,6 +42,8 @@ offered by Mission Critical Linux, or the LKCD kernel patch.
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%setup -n %{name}-%{version} -q
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%patch0 -p1 -b lzo_snappy.patch
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%patch1 -p1
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%patch2 -p1
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%patch3 -p1
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%build
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# This package has an internal copy of GDB which has broken configure code for
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@ -71,6 +75,9 @@ cp -p defs.h %{buildroot}%{_includedir}/crash
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%{_includedir}/*
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%changelog
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* Mon Jul 05 2021 Lianbo Jiang <lijiang@redhat.com> - 7.3.0-3
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- Fix "kmem -n|-p" options display wrong values.
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* Fri Jun 11 2021 Lianbo Jiang <lijiang@redhat.com> - 7.3.0-2
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- Fix for "kmem -s|-S" option on Linux 5.7 and later kernels
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