and contain percpu array_cache structures that were allocated with
vmalloc(). Without the patch, during session initialization there
will be error messages of the form: "crash: kmem_cache: <vaddr>:
invalid array_cache pointer: <vaddr>", and during runtime, the
"kmem -[sS]" commands will show kmem_cache lines that marked as
"[INVALID/CORRUPTED]".
(anderson@redhat.com)
which have offline cpus, and therefore will not contain associated
NT_PRSTATUS notes in the dumpfile header. Without the patch, if
there are any offline cpus, a segmentation violation is generated
during session initialization.
(anderson@redhat.com)
and compressed kdump clones. The patch utilizes the NT_PRSTATUS
notes in the dumpfile headers instead of reading them from the
kernel's "crash_notes", which are not initialized when QEMU generates
a dumpfile. Without the patch, these warning messages are displayed
during session initialization:
WARNING: invalid note (n_type != NT_PRSTATUS)
WARNING: cannot retrieve registers for active tasks
and running "bt" on an active task causes a segmentation violation.
(drjones@redhat.com)
Without the patch, if certain patterns of cpus are offline, the count
may be too small, causing cpu-dependent commands to not recognize
online cpus.
(Jan.Karlsson@sonymobile.com, anderson@redhat.com)
was not configured with CONFIG_IKCONFIG. Without the patch, the
initial system banner and the "sys" command show "UPTIME: (cannot
calculate: unknown HZ value)", the "ps -t" option shows "RUN TIME:
(cannot calculate: unknown HZ value)", and the "timer -r" option
kills the crash session with a floating point exception.
(hukeping@huawei.com)
an LPAE enabled kernel by first checking whether CONFIG_ARM_LPAE
exists in the vmcoreinfo data, and if it does not, by then checking
whether the next higher symbol above "swapper_pg_dir" is 0x5000 bytes
higher in value.
(sdu.liu@huawei.com)
the active tasks in the kernel's per-cpu crash_notes, there is an
initialization-time warning message indicating "could not retrieve
crash_notes". It has been changed to a more meaningful warning
message indicating "cannot retrieve registers for active tasks".
(anderson@redhat.com)
CONFIG_ARM_LPAE. The patch implements the virtual-to-physical
address translation of 64-bit PTEs used by ARM LPAE kernels.
(sdu.liu@huawei.com, weijitao@huawei.com)
cpus offline themselves during a kdump procedure. This causes an
invalid cpu count determination during crash session initialization
from an ARM vmcore. The patch utilizes the cpu count found in the
cpu_active_map if it is greater than the count in the cpu_online_map.
In addition, the maximum NR_CPUS value for the ARM architecture has
been raised from 4 to 32.
(sdu.liu@huawei.com)
