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[209.132.180.67]) by mx.google.com with ESMTP id l16si6618543otp.260.2020.03.09.18.32.33; Mon, 09 Mar 2020 18:32:47 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726382AbgCJBay (ORCPT + 99 others); Mon, 9 Mar 2020 21:30:54 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:11611 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726121AbgCJBax (ORCPT ); Mon, 9 Mar 2020 21:30:53 -0400 Received: from DGGEMS405-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id A251B7E4828CF1C25233; Tue, 10 Mar 2020 09:30:27 +0800 (CST) Received: from [127.0.0.1] (10.173.223.253) by DGGEMS405-HUB.china.huawei.com (10.3.19.205) with Microsoft SMTP Server id 14.3.487.0; Tue, 10 Mar 2020 09:30:19 +0800 Subject: Re: [PATCH v7 2/4] arm64: kdump: reserve crashkenel above 4G for crash dump kernel To: Prabhakar Kushwaha References: <20191223152349.180172-1-chenzhou10@huawei.com> <20191223152349.180172-3-chenzhou10@huawei.com> <0c00f14a-15ca-44db-7f82-00f15ddd3c88@huawei.com> CC: Thomas Gleixner , , Catalin Marinas , Will Deacon , James Morse , , Bhupesh Sharma , , Linux Doc Mailing List , kexec mailing list , Linux Kernel Mailing List , , linux-arm-kernel , Ganapatrao Prabhakerrao Kulkarni From: chenzhou Message-ID: Date: Tue, 10 Mar 2020 09:30:18 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.173.223.253] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 2020/3/9 23:51, Prabhakar Kushwaha wrote: > On 3/9/2020 10:18 AM, Prabhakar Kushwaha wrote: >> Hi Chen, >> >> On Sat, Mar 7, 2020 at 4:36 PM Chen Zhou wrote: >>> >>> >>> >>> On 2020/3/5 18:13, Prabhakar Kushwaha wrote: >>>> On Mon, Dec 23, 2019 at 8:57 PM Chen Zhou wrote: >>>>> >>>>> Crashkernel=X tries to reserve memory for the crash dump kernel under >>>>> 4G. If crashkernel=X,low is specified simultaneously, reserve spcified >>>>> size low memory for crash kdump kernel devices firstly and then reserve >>>>> memory above 4G. >>>>> >>>>> Signed-off-by: Chen Zhou >>>>> --- >>>>> arch/arm64/kernel/setup.c | 8 +++++++- >>>>> arch/arm64/mm/init.c | 31 +++++++++++++++++++++++++++++-- >>>>> 2 files changed, 36 insertions(+), 3 deletions(-) >>>>> >>>>> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c >>>>> index 56f6645..04d1c87 100644 >>>>> --- a/arch/arm64/kernel/setup.c >>>>> +++ b/arch/arm64/kernel/setup.c >>>>> @@ -238,7 +238,13 @@ static void __init request_standard_resources(void) >>>>> kernel_data.end <= res->end) >>>>> request_resource(res, &kernel_data); >>>>> #ifdef CONFIG_KEXEC_CORE >>>>> - /* Userspace will find "Crash kernel" region in /proc/iomem. */ >>>>> + /* >>>>> + * Userspace will find "Crash kernel" region in /proc/iomem. >>>>> + * Note: the low region is renamed as Crash kernel (low). >>>>> + */ >>>>> + if (crashk_low_res.end && crashk_low_res.start >= res->start && >>>>> + crashk_low_res.end <= res->end) >>>>> + request_resource(res, &crashk_low_res); >>>>> if (crashk_res.end && crashk_res.start >= res->start && >>>>> crashk_res.end <= res->end) >>>>> request_resource(res, &crashk_res); >>>>> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c >>>>> index b65dffd..0d7afd5 100644 >>>>> --- a/arch/arm64/mm/init.c >>>>> +++ b/arch/arm64/mm/init.c >>>>> @@ -80,6 +80,7 @@ static void __init reserve_crashkernel(void) >>>>> { >>>>> unsigned long long crash_base, crash_size; >>>>> int ret; >>>>> + phys_addr_t crash_max = arm64_dma32_phys_limit; >>>>> >>>>> ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), >>>>> &crash_size, &crash_base); >>>>> @@ -87,12 +88,38 @@ static void __init reserve_crashkernel(void) >>>>> if (ret || !crash_size) >>>>> return; >>>>> >>>>> + ret = reserve_crashkernel_low(); >>>>> + if (!ret && crashk_low_res.end) { >>>>> + /* >>>>> + * If crashkernel=X,low specified, there may be two regions, >>>>> + * we need to make some changes as follows: >>>>> + * >>>>> + * 1. rename the low region as "Crash kernel (low)" >>>>> + * In order to distinct from the high region and make no effect >>>>> + * to the use of existing kexec-tools, rename the low region as >>>>> + * "Crash kernel (low)". >>>>> + * >>>>> + * 2. change the upper bound for crash memory >>>>> + * Set MEMBLOCK_ALLOC_ACCESSIBLE upper bound for crash memory. >>>>> + * >>>>> + * 3. mark the low region as "nomap" >>>>> + * The low region is intended to be used for crash dump kernel >>>>> + * devices, just mark the low region as "nomap" simply. >>>>> + */ >>>>> + const char *rename = "Crash kernel (low)"; >>>>> + >>>>> + crashk_low_res.name = rename; >>>>> + crash_max = MEMBLOCK_ALLOC_ACCESSIBLE; >>>>> + memblock_mark_nomap(crashk_low_res.start, >>>>> + resource_size(&crashk_low_res)); >>>>> + } >>>>> + >>>>> crash_size = PAGE_ALIGN(crash_size); >>>>> >>>>> if (crash_base == 0) { >>>>> /* Current arm64 boot protocol requires 2MB alignment */ >>>>> - crash_base = memblock_find_in_range(0, arm64_dma32_phys_limit, >>>>> - crash_size, SZ_2M); >>>>> + crash_base = memblock_find_in_range(0, crash_max, crash_size, >>>>> + SZ_2M); >>>>> if (crash_base == 0) { >>>>> pr_warn("cannot allocate crashkernel (size:0x%llx)\n", >>>>> crash_size); >>>>> -- >>>> >>>> I tested this patch series on ARM64-ThunderX2 with no issue with >>>> bootargs crashkenel=X@Y crashkernel=250M,low >>>> >>>> $ dmesg | grep crash >>>> [ 0.000000] crashkernel reserved: 0x0000000b81200000 - >>>> 0x0000000c81200000 (4096 MB) >>>> [ 0.000000] Kernel command line: >>>> BOOT_IMAGE=/boot/vmlinuz-5.6.0-rc4+ >>>> root=UUID=866b8df3-14f4-4e11-95a1-74a90ee9b694 ro >>>> crashkernel=4G@0xb81200000 crashkernel=250M,low nowatchdog earlycon >>>> [ 29.310209] crashkernel=250M,low >>>> >>>> $ kexec -p -i /boot/vmlinuz-`uname -r` >>>> --initrd=/boot/initrd.img-`uname -r` --reuse-cmdline >>>> $ echo 1 > /proc/sys/kernel/sysrq ; echo c > /proc/sysrq-trigger >>>> >>>> But when i tried with crashkernel=4G crashkernel=250M,low as bootargs. >>>> Kernel is not able to allocate memory. >>>> [ 0.000000] cannot allocate crashkernel (size:0x100000000) >>>> [ 0.000000] Kernel command line: >>>> BOOT_IMAGE=/boot/vmlinuz-5.6.0-rc4+ >>>> root=UUID=866b8df3-14f4-4e11-95a1-74a90ee9b694 ro crashkernel=4G >>>> crashkernel=250M,low nowatchdog >>>> [ 29.332081] crashkernel=250M,low >>>> >>>> does crashkernel=X@Y mandatory to get allocated beyond 4G? >>>> am I missing something? >>> >>> I can't reproduce the problem in my environment, can you test with other size, >>> such as "crashkernel=1G crashkernel=250M,low", see if there is the same issue. >>> >> I tried 1G also. Same error, please find the logs >> >> $ dmesg | grep crash >> [ 0.000000] cannot allocate crashkernel (size:0x40000000) >> [ 0.000000] Kernel command line: >> BOOT_IMAGE=/boot/vmlinuz-5.6.0-rc4+ >> root=UUID=866b8df3-14f4-4e11-95a1-74a90ee9b694 ro nowatchdog earlycon >> crashkernel=1G crashkernel=250M,low >> [ 29.326916] crashkernel=250M,low >> >> >>> Besides, crashkernel=X@Y isn't mandatory to get allocated beyond 4G, >> >> this was my understanding also. >> >>> can you show the whole file /proc/iomem. >>> >> >> $ cat /proc/iomem >> 00000000-00000000 : PCI ECAM >> 00000000-00000000 : PCI ECAM >> 00000000-00000000 : PCI Bus 0000:00 >> 00000000-00000000 : PCI Bus 0000:0f >> 00000000-00000000 : PCI Bus 0000:10 >> 00000000-00000000 : 0000:10:00.0 >> 00000000-00000000 : 0000:10:00.0 >> 00000000-00000000 : PCI Bus 0000:01 >> 00000000-00000000 : 0000:01:00.0 >> 00000000-00000000 : 0000:01:00.1 >> 00000000-00000000 : PCI Bus 0000:05 >> 00000000-00000000 : 0000:05:00.0 >> 00000000-00000000 : 0000:05:00.1 >> 00000000-00000000 : PCI Bus 0000:09 >> 00000000-00000000 : 0000:09:00.0 >> 00000000-00000000 : 0000:09:00.1 >> 00000000-00000000 : 0000:00:10.0 >> 00000000-00000000 : ahci >> 00000000-00000000 : 0000:00:10.1 >> 00000000-00000000 : ahci >> 00000000-00000000 : PCI Bus 0000:80 >> 00000000-00000000 : PCI Bus 0000:83 >> 00000000-00000000 : 0000:83:00.0 >> 00000000-00000000 : 0000:83:00.0 >> 00000000-00000000 : nvme >> 00000000-00000000 : PCI Bus 0000:89 >> 00000000-00000000 : 0000:89:00.0 >> 00000000-00000000 : e1000e >> 00000000-00000000 : 0000:89:00.0 >> 00000000-00000000 : 0000:89:00.0 >> 00000000-00000000 : e1000e >> 00000000-00000000 : 0000:89:00.0 >> 00000000-00000000 : e1000e >> 00000000-00000000 : PCI Bus 0000:8d >> 00000000-00000000 : 0000:8d:00.0 >> 00000000-00000000 : 0000:8d:00.0 >> 00000000-00000000 : mpt3sas >> 00000000-00000000 : reserved >> 00000000-00000000 : System RAM >> 00000000-00000000 : Kernel code >> 00000000-00000000 : reserved >> 00000000-00000000 : Kernel data >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : System RAM >> 00000000-00000000 : reserved >> 00000000-00000000 : System RAM >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : System RAM >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : System RAM >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : System RAM >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : System RAM >> 00000000-00000000 : reserved >> 00000000-00000000 : CAV901C:00 >> 00000000-00000000 : CAV901D:00 >> 00000000-00000000 : CAV901C:00 >> 00000000-00000000 : CAV901E:00 >> 00000000-00000000 : CAV901C:00 >> 00000000-00000000 : CAV901F:00 >> 00000000-00000000 : CAV901C:00 >> 00000000-00000000 : CAV9006:00 >> 00000000-00000000 : CAV9006:00 >> 00000000-00000000 : ARMH0011:00 >> 00000000-00000000 : ARMH0011:00 >> 00000000-00000000 : arm-smmu-v3.0.auto >> 00000000-00000000 : arm-smmu-v3.0.auto >> 00000000-00000000 : arm-smmu-v3.1.auto >> 00000000-00000000 : arm-smmu-v3.1.auto >> 00000000-00000000 : arm-smmu-v3.2.auto >> 00000000-00000000 : arm-smmu-v3.2.auto >> 00000000-00000000 : CAV901C:01 >> 00000000-00000000 : CAV901D:01 >> 00000000-00000000 : CAV901C:01 >> 00000000-00000000 : CAV901E:01 >> 00000000-00000000 : CAV901C:01 >> 00000000-00000000 : CAV901F:01 >> 00000000-00000000 : CAV901C:01 >> 00000000-00000000 : CAV9007:06 >> 00000000-00000000 : CAV9007:06 >> 00000000-00000000 : arm-smmu-v3.3.auto >> 00000000-00000000 : arm-smmu-v3.3.auto >> 00000000-00000000 : arm-smmu-v3.4.auto >> 00000000-00000000 : arm-smmu-v3.4.auto >> 00000000-00000000 : arm-smmu-v3.5.auto >> 00000000-00000000 : arm-smmu-v3.5.auto >> 00000000-00000000 : System RAM >> 00000000-00000000 : System RAM >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : System RAM >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : reserved >> 00000000-00000000 : PCI Bus 0000:00 >> 00000000-00000000 : PCI Bus 0000:01 >> 00000000-00000000 : 0000:01:00.0 >> 00000000-00000000 : 0000:01:00.1 >> 00000000-00000000 : 0000:01:00.0 >> 00000000-00000000 : 0000:01:00.1 >> 00000000-00000000 : 0000:01:00.0 >> 00000000-00000000 : 0000:01:00.1 >> 00000000-00000000 : PCI Bus 0000:05 >> 00000000-00000000 : 0000:05:00.0 >> 00000000-00000000 : bnx2x >> 00000000-00000000 : 0000:05:00.1 >> 00000000-00000000 : bnx2x >> 00000000-00000000 : 0000:05:00.0 >> 00000000-00000000 : bnx2x >> 00000000-00000000 : 0000:05:00.0 >> 00000000-00000000 : bnx2x >> 00000000-00000000 : 0000:05:00.1 >> 00000000-00000000 : bnx2x >> 00000000-00000000 : 0000:05:00.1 >> 00000000-00000000 : bnx2x >> 00000000-00000000 : PCI Bus 0000:09 >> 00000000-00000000 : 0000:09:00.0 >> 00000000-00000000 : i40e >> 00000000-00000000 : 0000:09:00.1 >> 00000000-00000000 : i40e >> 00000000-00000000 : 0000:09:00.0 >> 00000000-00000000 : 0000:09:00.1 >> 00000000-00000000 : 0000:09:00.0 >> 00000000-00000000 : i40e >> 00000000-00000000 : 0000:09:00.1 >> 00000000-00000000 : i40e >> 00000000-00000000 : 0000:09:00.0 >> 00000000-00000000 : 0000:09:00.1 >> 00000000-00000000 : 0000:00:0f.0 >> 00000000-00000000 : xhci-hcd >> 00000000-00000000 : 0000:00:0f.0 >> 00000000-00000000 : 0000:00:0f.1 >> 00000000-00000000 : xhci-hcd >> 00000000-00000000 : 0000:00:0f.1 >> 00000000-00000000 : 0000:00:10.0 >> 00000000-00000000 : ahci >> 00000000-00000000 : 0000:00:10.1 >> 00000000-00000000 : ahci >> 00000000-00000000 : PCI Bus 0000:80 >> > > resending with correct logs (after login as root) > > $ cat /proc/iomem > 30000000-37ffffff : PCI ECAM > 38000000-3fffffff : PCI ECAM > 40000000-5fffffff : PCI Bus 0000:00 > 40000000-417fffff : PCI Bus 0000:0f > 40000000-417fffff : PCI Bus 0000:10 > 40000000-40ffffff : 0000:10:00.0 > 41000000-4101ffff : 0000:10:00.0 > 41800000-418fffff : PCI Bus 0000:01 > 41800000-4183ffff : 0000:01:00.0 > 41840000-4187ffff : 0000:01:00.1 > 41900000-419fffff : PCI Bus 0000:05 > 41900000-4197ffff : 0000:05:00.0 > 41980000-419fffff : 0000:05:00.1 > 41a00000-41afffff : PCI Bus 0000:09 > 41a00000-41a7ffff : 0000:09:00.0 > 41a80000-41afffff : 0000:09:00.1 > 41b00000-41b0ffff : 0000:00:10.0 > 41b00000-41b0ffff : ahci > 41b10000-41b1ffff : 0000:00:10.1 > 41b10000-41b1ffff : ahci > 60000000-7fffffff : PCI Bus 0000:80 > 60000000-600fffff : PCI Bus 0000:83 > 60000000-6001ffff : 0000:83:00.0 > 60020000-60023fff : 0000:83:00.0 > 60020000-60023fff : nvme > 60100000-601fffff : PCI Bus 0000:89 > 60100000-6017ffff : 0000:89:00.0 > 60100000-6017ffff : e1000e > 60180000-601bffff : 0000:89:00.0 > 601c0000-601dffff : 0000:89:00.0 > 601c0000-601dffff : e1000e > 601e0000-601e3fff : 0000:89:00.0 > 601e0000-601e3fff : e1000e > 60200000-603fffff : PCI Bus 0000:8d > 60200000-602fffff : 0000:8d:00.0 > 60300000-6030ffff : 0000:8d:00.0 > 60300000-6030ffff : mpt3sas > 802f0000-8030ffff : reserved > e6247000-e6247fff : reserved > e6720000-e690ffff : reserved > e6a90000-e6a9ffff : reserved > e6ab0000-e721ffff : reserved > e7240000-e7240fff : reserved > fac00000-fafdffff : reserved > 400040400-40004041f : CAV901C:00 > 400040480-400040567 : CAV901D:00 > 400040480-400040567 : CAV901C:00 > 400040600-40004073b : CAV901E:00 > 400040600-40004073b : CAV901C:00 > 400041400-40004177f : CAV901F:00 > 400041400-40004177f : CAV901C:00 > 402000100-402000fff : CAV9006:00 > 402000100-402000fff : CAV9006:00 > 402020000-40202ffff : ARMH0011:00 > 402020000-40202ffff : ARMH0011:00 > 402300000-40230ffff : arm-smmu-v3.0.auto > 402300000-40230ffff : arm-smmu-v3.0.auto > 402320000-40232ffff : arm-smmu-v3.1.auto > 402320000-40232ffff : arm-smmu-v3.1.auto > 402340000-40234ffff : arm-smmu-v3.2.auto > 402340000-40234ffff : arm-smmu-v3.2.auto > 440040400-44004041f : CAV901C:01 > 440040480-440040567 : CAV901D:01 > 440040480-440040567 : CAV901C:01 > 440040600-44004073b : CAV901E:01 > 440040600-44004073b : CAV901C:01 > 440041400-44004177f : CAV901F:01 > 440041400-44004177f : CAV901C:01 > 4421a0000-4421affff : CAV9007:06 > 4421a0000-4421affff : CAV9007:06 > 442300000-44230ffff : arm-smmu-v3.3.auto > 442300000-44230ffff : arm-smmu-v3.3.auto > 442320000-44232ffff : arm-smmu-v3.4.auto > 442320000-44232ffff : arm-smmu-v3.4.auto > 442340000-44234ffff : arm-smmu-v3.5.auto > 442340000-44234ffff : arm-smmu-v3.5.auto > b81200000-c811fffff : System RAM > b81280000-b8270ffff : Kernel code > b82710000-b82dfffff : reserved > b82e00000-b83168fff : Kernel data > b83169000-baccd7fff : reserved > c78a00000-c7fffffff : reserved > c80129000-c801a9fff : reserved > c801aa000-c809e9fff : reserved > c809ec000-c809eefff : reserved > c809ef000-c811fffff : reserved > 10000000000-13fffffffff : PCI Bus 0000:00 > 10000000000-100013fffff : PCI Bus 0000:01 > 10000000000-100007fffff : 0000:01:00.0 > 10000800000-10000ffffff : 0000:01:00.1 > 10001000000-1000101ffff : 0000:01:00.0 > 10001020000-1000103ffff : 0000:01:00.1 > 10001040000-1000104ffff : 0000:01:00.0 > 10001050000-1000105ffff : 0000:01:00.1 > 10001400000-100037fffff : PCI Bus 0000:05 > 10001400000-1000140ffff : 0000:05:00.0 > 10001400000-1000140ffff : bnx2x > 10001410000-1000141ffff : 0000:05:00.1 > 10001410000-1000141ffff : bnx2x > 10001800000-10001ffffff : 0000:05:00.0 > 10001800000-10001ffffff : bnx2x > 10002000000-100027fffff : 0000:05:00.0 > 10002000000-100027fffff : bnx2x > 10002800000-10002ffffff : 0000:05:00.1 > 10002800000-10002ffffff : bnx2x > 10003000000-100037fffff : 0000:05:00.1 > 10003000000-100037fffff : bnx2x > 10003800000-100053fffff : PCI Bus 0000:09 > 10003800000-10003ffffff : 0000:09:00.0 > 10003800000-10003ffffff : i40e > 10004000000-100047fffff : 0000:09:00.1 > 10004000000-100047fffff : i40e > 10004800000-10004bfffff : 0000:09:00.0 > 10004c00000-10004ffffff : 0000:09:00.1 > 10005000000-10005007fff : 0000:09:00.0 > 10005000000-10005007fff : i40e > 10005008000-1000500ffff : 0000:09:00.1 > 10005008000-1000500ffff : i40e > 10005010000-1000510ffff : 0000:09:00.0 > 10005110000-1000520ffff : 0000:09:00.1 > 10005400000-1000540ffff : 0000:00:0f.0 > 10005400000-1000540ffff : xhci-hcd > 10005410000-1000541ffff : 0000:00:0f.0 > 10005420000-1000542ffff : 0000:00:0f.1 > 10005420000-1000542ffff : xhci-hcd > 10005430000-1000543ffff : 0000:00:0f.1 > 10005440000-1000544ffff : 0000:00:10.0 > 10005440000-1000544ffff : ahci > 10005450000-1000545ffff : 0000:00:10.1 > 10005450000-1000545ffff : ahci > 14000000000-17fffffffff : PCI Bus 0000:80 > > > failure with crashkernel=1G > > :~$ dmesg | grep crash > [ 0.000000] cannot allocate crashkernel (size:0x40000000) > [ 0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.6.0-rc4+ > root=UUID=866b8df3-14f4-4e11-95a1-74a90ee9b694 ro nowatchdog earlycon > crashkernel=1G crashkernel=250M,low > [ 29.326916] crashkernel=250M,low > I read these clearly, found that your all testcases failed including "crashkernel=4G@0xb81200000 crashkernel=250M,low". There is no "Crash kernel (low)" in all your tests, that is there is no enough low memory, in these cases, parameters equal to 4G@0xb81200000, crashkernel=4G and crashkernel=1G. crashkernel=4G and crashkernel=1G all failed because there is no low memory. Thanks, Chen Zhou > --pk > > . >