Crash-utility October 2014

devel@lists.crash-utility.osci.io

15 participants
26 discussions

[ANNOUNCE] crash gcore command, version 1.3.0-rc is released

by "Hatayama, Daisuke/畑山大輔"

This is the release of crash gcore command, version 1.3.0-rc. The version 1.3.0 is going to newly add ARM64 support, and the purpose of this rc version release is for verification by other architecture maintainers. Please give me a verfication result as a reply to this mail. The remaining changes are all bugfixes. ChangeLog: - Add ARM64 support. In addition to native ARM64 build, like crash utility, we can build x86_64 executable of crash gcore command for ARM64 crash dump by make target=ARM64, just like crash utility. (anderson(a)redhat.com) - Fix a bug that registers in NT_PRSTATUS note information is broken. This had been since v1.2.2 when O(1) note informaiton collection was added. Without this fix, we can never get reliable register values for failure analysis. (weishu(a)marvell.com) - Fix a bug that NT_386_IOPERM note information is not collected. So far, ioperm_get() had always returned 1. As a result, NT_386_IOPERM note information had never been not included in a generated core file even if it is available for a given task on a given crash dump. (d.hatayama(a)jp.fujitsu.com) - Add new member offset initialization for struct nsproxy::pid_ns_for_children. In upstream, the following patch renamed struct nsproxy::pid_ns into struct nsproxy::pid_ns_for_children. $ git log -1 c2b1df2e commit c2b1df2eb42978073ec27c99cc199d20ae48b849 Author: Andy Lutomirski <luto(a)amacapital.net> Date: Thu Aug 22 11:39:16 2013 -0700 Rename nsproxy.pid_ns to nsproxy.pid_ns_for_children nsproxy.pid_ns is *not* the task's pid namespace. The name should clarify that. This makes it more obvious that setns on a pid namespace is weird -- it won't change the pid namespace shown in procfs. Signed-off-by: Andy Lutomirski <luto(a)amacapital.net> Reviewed-by: "Eric W. Biederman" <ebiederm(a)xmission.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Without this fix, gcore exited abnormally at its initialization part and so core file is never generated. (d.hatayama(a)jp.fujitsu.com) - Fix a bug that a wrong way of checking return value of fopen(). fopen() returns NULL in case of error, but gcore had seen it as returning a minus integer. As a result, gcore continues execution after the check even in case of error and then exits abnormally at the first call of fwrite() with the broken file pointer gcore failed to open. From users' viewpoint, we face this bug when trying to overwrite an existing corefile with more priviledged permission and resulting in EPERM failure. (d.hatayama(a)jp.fujitsu.com) MD5 CheckSum: $ md5sum ./crash-gcore-command-1.3.0-rc.tar.gz 0b841985c084e790966800edfd1b5d43 ./crash-gcore-command-1.3.0-rc.tar.gz -- Thanks. HATAYAMA, Daisuke

9 years, 9 months

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(no subject)

by Karlsson, Jan

Hi I have seen a problem when it comes to the number of cpus for ARM (32-bits). static int arm_get_smp_cpus(void) { return MAX(get_cpus_active(), get_cpus_online()); } In one of my example, "help -k" gives me: cpu_possible_map: 0 1 2 3 cpu_present_map: 0 1 2 3 cpu_online_map: 0 3 cpu_active_map: 3 So the number of cpus will become 2. However there are code in a number of places that will then only accept cpu 0 and 1 as cpus to handle. When I changed to code to be the same as for ARM64 things worked as expected: static int arm_get_smp_cpus(void) { return MAX(get_cpus_online(), get_highest_cpu_online()+1); } Jan Jan Karlsson Senior Software Engineer System Assurance Sony Mobile Communications Tel: +46 703 062 174 jan.karlsson(a)sonymobile.com<mailto:Firstname.Lastname@sonymobile.com> sonymobile.com<http://sonymobile.com/> [cid:image001.gif@01CFE865.529F8280]

9 years, 9 months

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HEADS UP: crash will fail to initialize with upstream CONFIG_SLAB kernels

by Dave Anderson

Just a heads-up to those who may be running with bleeding-edge upstream kernels that have this commit: commit bf0dea23a9c094ae869a88bb694fbe966671bf6d Author: Joonsoo Kim <iamjoonsoo.kim(a)lge.com> Date: Thu Oct 9 15:26:27 2014 -0700 mm/slab: use percpu allocator for cpu cache This change will cause the crash session to fail during initialization if the target kernel is configured with CONFIG_SLAB. I haven't tried it, but it looks like it would fail with an invalid structure member offset message w/respect to "kmem_cache_s_array". To work around it, you could try using the --no_kmem_cache command line option. Since RHEL and Fedora use CONFIG_SLUB, it wouldn't be an issue with those distributions. Dave

9 years, 9 months

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[PATCH] Endian-mismatch: crash shows a contrary error message

by HuKeping

When the vmcore or vmlinux is not the same endian with the host, crash will give out a error message to show that mismatching, but the message itself is not correct. This patch fix that logical bug. Signed-off-by: Hu Keping <hukeping(a)huawei.com> --- tools.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools.c b/tools.c index 4ff3fd5..cb684b1 100644 --- a/tools.c +++ b/tools.c @@ -5515,12 +5515,12 @@ endian_mismatch(char *file, char dumpfile_endian, ulong query) case ELFDATA2LSB: if (__BYTE_ORDER == __LITTLE_ENDIAN) return FALSE; - endian = "big-endian"; + endian = "little-endian"; break; case ELFDATA2MSB: if (__BYTE_ORDER == __BIG_ENDIAN) return FALSE; - endian = "little-endian"; + endian = "big-endian"; break; default: endian = "unknown"; -- 1.8.5.5

9 years, 9 months

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[PATCH v3 00/21] support hiding data of offline cpu

by qiaonuohan

For those who don't care about the removed cpu, data of offline cpu is bothering. This patchset is trying to hide data of offline cpu. Please check each patch to see what is hiden. The last version is here: https://www.redhat.com/archives/crash-utility/2014-September/msg00078.html Changelog: v2->v3: 1. change "<OFFLINE>" to "[OFFLINE]" to indicate data of offline cpu 2. delete the following patches: x86_64: modify help -m/-M to hide offline cpus' data modify help -k to hide offline cpus' number modify irq -a to hide offline cpus' data modify print_task_header() to indicate idle task on offline cpu 3. change the following patches to remain the original data and append an "[OFFLINE]" to indicate the data is related to the offline cpu: x86_64: modify mach to hide offline cpus' data modify ptov offset:cpuspec to hide offline cpus' data modify kmem -o to hide offline cpus' data 4. change output of "modify display_sys_stats() to hide cpus' number" 5. change ps to indicate swapper task on offline cpu with "-" v1->v2: 1. patch 1: add environment variable and its argument to hide/show data of offline cpu. 2. add description of environment variable to crash.8 3. remove the restrict of x86_64 4. add "<OFFLINE>" to indicate those hiden data. 5. patch 22/23: addd "<OFFLINE>" to indicate idle task on offline Qiao Nuohan (21): add a flag to display/hide data of offline cpus add an API to check whether to hide a cpus' data x86_64: modify bt -E to hide offline cpus' data x86_64: modify mach to indicate offline cpus' data x86_64: modify mach -c to hide offline cpus' data modify help -r to hide offline cpus' registers modify bt -c to hide offline cpus' data modify display_sys_stats() to indicate offline cpus modify set -c to hide offline cpu modify irq -s to hide offline cpus' data modify timer -r to hide offline cpus' data modify timer to hide offline cpus' data modify ptov offset:cpuspec to indicate offline cpus' data fix max_cpudata_limit() when offlined cpu exists modify kmem -o to indicate offline cpus' data modify kmem -S(SLUB) to hide offline cpus' data modify struct/union/* [:cpuspec] to hide offline cpus' data modify command p to hide offline cpus' data modify ps -l/-m -C cpu to hide offline cpus' data modify runq to hide offline cpus' data modify ps to indicate swapper task on offline cpu crash.8 | 4 ++++ defs.h | 3 +++ diskdump.c | 6 ++++- help.c | 10 +++++++- kernel.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-- main.c | 15 +++++++++++- memory.c | 30 ++++++++++++++++++++---- netdump.c | 25 ++++++++++++++++++-- symbols.c | 15 +++++++++++- task.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++--------- tools.c | 15 ++++++++++++ x86_64.c | 46 ++++++++++++++++++++++++++++++------ 12 files changed, 290 insertions(+), 30 deletions(-) -- 1.8.5.3

9 years, 9 months

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[PATCH v2 00/25] support hiding data of offline cpu

by Qiao Nuohan

For those who don't care about the removed cpu, data of offline cpu is bothering. This patchset is trying to hide data of offline cpu. Please check each patch to see what is hiden. The last version is here: https://www.redhat.com/archives/crash-utility/2014-September/msg00000.html Changelog: v1->v2: 1. patch 1: add environment variable and its argument to hide/show data of offline cpu. 2. add description of environment variable to crash.8 3. remove the restrict of x86_64 4. add "<OFFLINE>" to indicate those hiden data. 5. patch 22/23: addd "<OFFLINE>" to indicate idle task on offline cpu Qiao Nuohan (25): add a flag to display/hide data of offline cpus add an API to check whether to hide a cpus' data x86_64: modify help -m/-M to hide offline cpus' data x86_64: modify bt -E to hide offline cpus' data x86_64: modify mach to hide offline cpus' data x86_64: modify mach -c to hide offline cpus' data modify help -r to hide offline cpus' registers modify bt -c to hide offline cpus' data modify display_sys_stats() to hide cpus' number modify help -k to hide offline cpus' number modify set -c to hide offline cpu modify irq -s to hide offline cpus' data modify irq -a to hide offline cpus' data modify timer -r to hide offline cpus' data modify timer to hide offline cpus' data modify ptov offset:cpuspec to hide offline cpus' data fix max_cpudata_limit() when offlined cpu exists modify kmem -o to hide offline cpus' data modify kmem -S(SLUB) to hide offline cpus' data modify struct/union/* [:cpuspec] to hide offline cpus' data modify command p to hide offline cpus' data modify ps to indicate idle task on offline cpu modify print_task_header() to indicate idle task on offline cpu modify ps -l/-m -C cpu to hide offline cpus' data modify runq to hide offline cpus' data crash.8 | 4 +++ defs.h | 3 ++ diskdump.c | 6 +++- help.c | 6 ++++ kernel.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++---- main.c | 15 +++++++++- memory.c | 30 +++++++++++++++---- netdump.c | 25 ++++++++++++++-- symbols.c | 15 +++++++++- task.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++---------- tools.c | 15 ++++++++++ x86_64.c | 74 +++++++++++++++++++++++++++++++++++++++-------- 12 files changed, 331 insertions(+), 42 deletions(-) -- 1.8.5.3

9 years, 10 months

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Crash-utility October 2014