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From dd3886b82ed56c18d9d6d0e7228a2b31eed0ec5a Mon Sep 17 00:00:00 2001
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Message-Id: <dd3886b82ed56c18d9d6d0e7228a2b31eed0ec5a.1489676829.git.panand@redhat.com>
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In-Reply-To: <f85183096d31d865c97565614535d84943b12908.1489676829.git.panand@redhat.com>
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References: <f85183096d31d865c97565614535d84943b12908.1489676829.git.panand@redhat.com>
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From: AKASHI Takahiro <takahiro.akashi@linaro.org>
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Date: Wed, 15 Mar 2017 18:38:20 +0900
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Subject: [PATCH 06/10] arm64: kdump: add elf core header segment
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Elf core header contains the information necessary for the coredump of
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the 1st kernel, including its physcal memory layout as well as cpu register
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states at the panic.
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The segment is allocated inside the reserved memory of crash dump kernel.
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Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
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---
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kexec/arch/arm64/crashdump-arm64.c | 96 ++++++++++++++++++++++++++++++++++++++
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kexec/arch/arm64/crashdump-arm64.h | 3 ++
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kexec/arch/arm64/iomem.h | 2 +
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kexec/arch/arm64/kexec-elf-arm64.c | 10 ++++
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4 files changed, 111 insertions(+)
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diff --git a/kexec/arch/arm64/crashdump-arm64.c b/kexec/arch/arm64/crashdump-arm64.c
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index dcaca434af62..83461312d412 100644
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--- a/kexec/arch/arm64/crashdump-arm64.c
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+++ b/kexec/arch/arm64/crashdump-arm64.c
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@@ -39,6 +39,39 @@ struct memory_ranges usablemem_rgns = {
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.ranges = &crash_reserved_mem,
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};
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+struct memory_range elfcorehdr_mem;
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+
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+static struct crash_elf_info elf_info = {
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+ .class = ELFCLASS64,
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+#if (__BYTE_ORDER == __LITTLE_ENDIAN)
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+ .data = ELFDATA2LSB,
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+#else
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+ .data = ELFDATA2MSB,
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+#endif
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+ .machine = EM_AARCH64,
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+};
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+
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+/*
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+ * Note: The returned value is correct only if !CONFIG_RANDOMIZE_BASE.
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+ */
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+static uint64_t get_kernel_page_offset(void)
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+{
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+ int i;
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+
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+ if (elf_info.kern_vaddr_start == UINT64_MAX)
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+ return UINT64_MAX;
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+
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+ /* Current max virtual memory range is 48-bits. */
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+ for (i = 48; i > 0; i--)
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+ if (!(elf_info.kern_vaddr_start & (1UL << i)))
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+ break;
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+
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+ if (i <= 0)
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+ return UINT64_MAX;
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+ else
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+ return UINT64_MAX << i;
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+}
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+
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/*
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* iomem_range_callback() - callback called for each iomem region
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* @data: not used
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@@ -62,6 +95,10 @@ static int iomem_range_callback(void *UNUSED(data), int UNUSED(nr),
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else if (strncmp(str, SYSTEM_RAM, strlen(SYSTEM_RAM)) == 0)
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return mem_regions_add(&crash_memory_rgns,
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base, length, RANGE_RAM);
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+ else if (strncmp(str, KERNEL_CODE, strlen(KERNEL_CODE)) == 0)
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+ elf_info.kern_paddr_start = base;
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+ else if (strncmp(str, KERNEL_DATA, strlen(KERNEL_DATA)) == 0)
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+ elf_info.kern_size = base + length - elf_info.kern_paddr_start;
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return 0;
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}
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@@ -115,5 +152,64 @@ static int crash_get_memory_ranges(void)
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dbgprint_mem_range("Coredump memory ranges",
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crash_memory_rgns.ranges, crash_memory_rgns.size);
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+ /*
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+ * For additional kernel code/data segment.
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+ * kern_paddr_start/kern_size are determined in iomem_range_callback
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+ */
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+ elf_info.kern_vaddr_start = get_kernel_sym("_text");
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+ if (!elf_info.kern_vaddr_start)
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+ elf_info.kern_vaddr_start = UINT64_MAX;
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+
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+ return 0;
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+}
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+
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+/*
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+ * load_crashdump_segments() - load the elf core header
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+ * @info: kexec info structure
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+ *
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+ * This function creates and loads an additional segment of elf core header
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+ : which is used to construct /proc/vmcore on crash dump kernel.
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+ *
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+ * Return 0 in case of success and -1 in case of error.
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+ */
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+
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+int load_crashdump_segments(struct kexec_info *info)
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+{
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+ unsigned long elfcorehdr;
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+ unsigned long bufsz;
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+ void *buf;
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+ int err;
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+
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+ /*
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+ * First fetch all the memory (RAM) ranges that we are going to
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+ * pass to the crash dump kernel during panic.
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+ */
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+
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+ err = crash_get_memory_ranges();
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+
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+ if (err)
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+ return err;
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+
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+ elf_info.page_offset = get_kernel_page_offset();
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+ dbgprintf("%s: page_offset: %016llx\n", __func__,
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+ elf_info.page_offset);
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+
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+ err = crash_create_elf64_headers(info, &elf_info,
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+ crash_memory_rgns.ranges, crash_memory_rgns.size,
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+ &buf, &bufsz, ELF_CORE_HEADER_ALIGN);
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+
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+ if (err)
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+ return err;
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+
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+ elfcorehdr = add_buffer_phys_virt(info, buf, bufsz, bufsz, 0,
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+ crash_reserved_mem.start, crash_reserved_mem.end,
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+ -1, 0);
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+
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+ elfcorehdr_mem.start = elfcorehdr;
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+ elfcorehdr_mem.end = elfcorehdr + bufsz - 1;
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+
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+ dbgprintf("%s: elfcorehdr 0x%llx-0x%llx\n", __func__,
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+ elfcorehdr_mem.start, elfcorehdr_mem.end);
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+
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return 0;
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}
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diff --git a/kexec/arch/arm64/crashdump-arm64.h b/kexec/arch/arm64/crashdump-arm64.h
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index 07a0ed0bc344..da75a2d0c5f1 100644
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--- a/kexec/arch/arm64/crashdump-arm64.h
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+++ b/kexec/arch/arm64/crashdump-arm64.h
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@@ -18,5 +18,8 @@
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extern struct memory_ranges usablemem_rgns;
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extern struct memory_range crash_reserved_mem;
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+extern struct memory_range elfcorehdr_mem;
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+
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+extern int load_crashdump_segments(struct kexec_info *info);
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#endif /* CRASHDUMP_ARM64_H */
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diff --git a/kexec/arch/arm64/iomem.h b/kexec/arch/arm64/iomem.h
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index 20cda87dbd02..d4864bb44922 100644
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--- a/kexec/arch/arm64/iomem.h
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+++ b/kexec/arch/arm64/iomem.h
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@@ -2,6 +2,8 @@
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#define IOMEM_H
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#define SYSTEM_RAM "System RAM\n"
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+#define KERNEL_CODE "Kernel code\n"
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+#define KERNEL_DATA "Kernel data\n"
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#define CRASH_KERNEL "Crash kernel\n"
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#define IOMEM_RESERVED "reserved\n"
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diff --git a/kexec/arch/arm64/kexec-elf-arm64.c b/kexec/arch/arm64/kexec-elf-arm64.c
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index daf8bf0df9c4..c70a37ae7732 100644
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--- a/kexec/arch/arm64/kexec-elf-arm64.c
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+++ b/kexec/arch/arm64/kexec-elf-arm64.c
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@@ -119,6 +119,16 @@ int elf_arm64_load(int argc, char **argv, const char *kernel_buf,
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dbgprintf("%s: PE format: %s\n", __func__,
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(arm64_header_check_pe_sig(header) ? "yes" : "no"));
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+ if (info->kexec_flags & KEXEC_ON_CRASH) {
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+ /* create and initialize elf core header segment */
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+ result = load_crashdump_segments(info);
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+ if (result) {
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+ dbgprintf("%s: Creating eflcorehdr failed.\n",
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+ __func__);
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+ goto exit;
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+ }
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+ }
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+
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/* load the kernel */
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result = elf_exec_load(&ehdr, info);
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--
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2.9.3
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