2:09 p.m.
Download from: http://people.redhat.com/anderson
or
https://github.com/crash-utility/crash/releases
The github master branch serves as a development branch that will contain
all patches that are queued for the next release:
$ git clone git://github.com/crash-utility/crash.git
Changelog:
- Resurrection of the the "dev -p" option for displaying PCI device
data on Linux 2.6.26 and later kernels. The option was deprecated
as of Linux 2.6.26, and without the patch, the option would indicate
"dev: -p option not supported or applicable on this architecture
or kernel" when running against the newer kernel versions. PCI Bus
information will also be displayed with this patch.
(m.mizuma(a)jp.fujitsu.com)
- With Linux 4.19-rc1 commit 7d4340bb92a9df78e6e28152f3dd89d9bd82146b,
titled "powerpc/mm: Increase MAX_PHYSMEM_BITS to 128TB with
SPARSEMEM_VMEMMAP config", the PPC64 MAX_PHYSMEM_BITS value has
been bumped up to 47. The appropriate update has been made in
this patch.
(hbathini(a)linux.ibm.com)
- Fix to allow piping command output to a shell script beginning with
a shebang (#!) character sequence if the script pathname is specified
with a preceding "./" or "/". Without the patch, the piped command
fails with the message "crash: pipe operation failed".
(k-hagio(a)ab.jp.nec.com)
- Fix for the PPC64 "bt" command to recognize when a thread is running
in OPAL firmware. Without the patch, the "bt" command indicates
<task-address>: Invalid Stack Pointer <OPAL-firmware-address>"
(hbathini(a)linux.ibm.com)
- As an addendum to the "dev -p" patch above, add the new structure
member offsets for display by the "help -o" option.
(anderson(a)redhat.com)
- Enhancement to the "kmem -n" option to dump memory block information
if the kernel supports it. In addition, the memory section data
block has a new "STATE" column added to it.
(m.mizuma(a)jp.fujitsu.com)
- Addendum to the previous "kmem -n" patch to fix a FTBFS issue.
Without the patch, certain architectures fail to compile with the
error "memory.c:17315:16: error: ‘PAGE_SHIFT’ undeclared (first
use in this function)"
(m.mizuma(a)jp.fujitsu.com)
- Fix the calculation of the vmalloc memory region size to account for
Linux 4.17 commit a7412546d8cb5ad578805060b4006f2a021b5868, titled
"x86/mm: Adjust vmalloc base and size at boot-time", which increases
the region's size from 32TB to 1280TB when 5-level pagetables are
enabled. Also presume that virtual addresses above the end of the
vmalloc space up to the beginning of vmemmap space are translatable
via 5-level page tables. Without the patch, mapped virtual addresses
may fail translation in whatever command accesses them, with errors
indicating "seek error: kernel virtual address: <mapped-address>
type: <type-string>"
(anderson(a)redhat.com)
- Address several Coverity Scan "RESOURCE_LEAK" issues in the following
top-level source files: cmdline.c, kvmdump.c, lkcd_v8.c, xendump.c,
symbols.c, unwind_x86_32_64.c, va_server.c and va_server_v1.c.
(anderson(a)redhat.com)
- Modify the x86_64 "bt" behavior when a legitimate exception RIP value
cannot be referenced symbolically, such as when the exception occurs
while running in seccomp BPF filter code. Without the patch, the
exception frame register dump is preceded by "[exception RIP: unknown
or invalid address]", and then followed by "bt: WARNING: possibly
bogus exception frame". With the patch applied, the translation of
the exception RIP will show "[exception RIP: no symbolic reference]",
and there will be no warning message.
(anderson(a)redhat.com)
- Account for the /proc/kcore VMCOREINFO PT_NOTE in Linux 4.19 and
later kernels having commit 23c85094fe1895caefdd19ef624ee687ec5f4507,
titled "proc/kcore: add vmcoreinfo note to /proc/kcore". The PT_NOTE
information is stored during session initialization for later display
by "help -[n|D]"; a subsequent commit will make it available for use
by the crash utility's internal pc->read_vmcoreinfo() function.
(anderson(a)redhat.com)
- Second phase of support for the VMCOREINFO PT_NOTE added to the ELF
header of /proc/kcore in Linux 4.19 and later kernels. This patch
introduces support for live session /proc/kcore VMCOREINFO access by
the crash utility's internal pc->read_vmcoreinfo() function. New
usage include the initialization of the x86_64 phys_base value, and
the arm64 phys_offset, page size, and VA bits count.
(anderson(a)redhat.com)
- Fix for Linux 4.20-rc1 and later kernels that contain kernel commit
5c83511bdb9832c86be20fb86b783356e2f58062, titled "x86/paravirt: Use
a single ops structure". Without the patch, the kernel may be
misidentified as an ARCH_XEN kernel, with the most noticable result
being the inability to read vmemmap'd page structures.
(anderson(a)redhat.com)
- Implemented the functionality for a new MEMBER_TYPE_NAME() macro,
which will return a pointer to the type name string of a structure
member. It is being put in place for the support of Linux 4.20
radix tree to xarray replacements, where structure member types may
be changed from radix_tree_root structures to xarray structures.
(anderson(a)redhat.com)
- First phase of support for the XArray facility. The added support is
similar to that of radix trees, but introduces completely separate
functions, structures and #defines. None of the applicable radix
tree users in the crash utility have been switched over, so this
phase does not introduce any functional changes.
(asmadeus(a)codewreck.org, anderson(a)redhat.com)
- Second phase of support for the XArray facility, which handles the
switch-over of PID handling from a radix tree to an XArray in Linux
4.20 and later kernels. Without the patch, the crash session fails
during session initialization with the message "crash: radix trees
do not exist or have changed their format".
(asmadeus(a)codewreck.org, anderson(a)redhat.com)
- Third phase of support for the XArray facility, which consolidates
the radix_tree_pair and xarray_pair structures into a unified
list_pair structure that is used by both facilities, and fixes the
"bpf" command. Without the patch, the command fails on Linux 4.20
or later kernels with the error message "bpf: radix trees do not
exist or have changed their format".
(anderson(a)redhat.com)
- Added support for usage of the XArray facility by the "files -p"
option. Without the patch, the command fails on Linux 4.20 and later
kernels with the error message "files: radix trees do not exist or
have changed their format".
(anderson(a)redhat.com)
- Added support for usage of the XArray facility by the "irq" command.
Without the patch, the command fails on Linux 4.20 and later kernels
with the error message "irq: radix trees do not exist or have changed
their format".
(anderson(a)redhat.com)
- Added support for usage of the XArray facility by the "ipcs" command.
Without the patch, the command may fail on Linux 4.20 and later
kernels with the error message "irq: radix trees do not exist or have
changed their format".
(anderson(a)redhat.com)
- Added a new "tree -t xarray" option to display of the contents of
an XArray in Linux 4.20 and later kernels. The implementation is
similar to that of radix tree displays, but in addition, the "-p"
option will also display the index value of each entry in a radix
tree or XArray.
(anderson(a)redhat.com)
- Fix for the "files -p <inode>" option on a file with a large
number of pages. Without the patch, the command attempts to read
radix tree node slot entries that are RADIX_TREE_EXCEPTIONAL_ENTRY
types instead of page pointers, and as a result may fail with a
dump of the internal buffer allocation stats followed by the message
"files: cannot allocate any more memory!".
(anderson(a)redhat.com)
- Fix for the "ps -s" option on ARM64 if the number of tasks exceeds
2000. Without the patch, the command ultimately fails with a
dump of the internal buffer allocation stats, followed by the
message "ps: cannot allocate any more memory!".
(anderson(a)redhat.com)
- With Linux 4.20-rc1 commit 4ffe713b7587b14695c9bec26a000fc88ef54895,
titled "powerpc/mm: Increase the max addressable memory to 2PB",
the PPC64 MAX_PHYSMEM_BITS value has been bumped up to 51 for
CONFIG_SPARSEMEM_VMEMMAP and CONFIG_SPARSEMEM_EXTREME. The
appropriate update has been made in this patch.
(hbathini(a)linux.ibm.com)
- Implemented a new plugin function for the readline library's tab
completion feature. Without the patch, the use of the default plugin
from the embedded gdb module has been seen to cause segmentation
violations or other fatal malloc/free/corruption assertions. The new
plugin takes gdb out of the picture entirely, and also restricts the
matching options to just symbol names, so as not to clutter the
results with irrelevant filenames.
(anderson(a)redhat.com)
- The RHEL8 kernel will contain a backport of the Linux 4.19 kernel
commit 7d4340bb92a9df78e6e28152f3dd89d9bd82146b, titled "powerpc/mm:
Increase MAX_PHYSMEM_BITS to 128TB with SPARSEMEM_VMEMMAP config".
As a result, the use of the THIS_KERNEL_VERSION() macro by the
crash utility does not suffice for determining the MAX_PHYSMEM_BITS
value for PPC64. The appropriate update has been made in this patch.
(anderson(a)redhat.com)
- Fix for an initialization-time session failure when all three of the
following conditions exist:
(1) invoking the session with "crash -d2" or larger debug number
(2) running against a Linux 3.3 or later kernel
(3) using a post-7.2.4 crash utility that has the new "kmem -n"
support above for the display of memory blocks
Without the patch, the crash session fails with the error message
"crash: invalid structure member offset: device_kobj".
(anderson(a)redhat.com)
- Fix for an initialization-time segmentation violation when invoking
crash-7.2.4 or later with "crash -d2" or larger debug number.
(anderson(a)redhat.com)
- Add a write operation handler to the sample /dev/crash memory driver
that enables writing to kernel memory via the "wr" command.
(serapheim(a)delphix.com)
- Prevent a SIGSEGV if a user attempts to input a command line that
exceeds the maximum length of 1500 bytes. The patch displays an
error message and ignores the command line.
(anderson(a)redhat.com)
- Fix for the "dev -[dD]" options in kernels containing Linux 5.0-rc1
commit 7ff4f8035695984c513598e2d49c8277d5d234ca, titled "block:
remove dead queue members", in which the number of I/Os issued to
a disk driver are no longer stored in the request_queue structure.
Without the patch, the options indicate "dev: -d option not supported
or applicable on this architecture or kernel". With the patch, the
"DRV" column is not shown.
(m.mizuma(a)jp.fujitsu.com)
- A crash-7.1.1 commit added support for Linux version 5.x. To prevent
surprise failures due to unexpected kernel version bumps in the
future, support has been added for version 6, keeping it one step
ahead.
(anderson(a)redhat.com)
- Fix for a gcc-9 compilation error that occurs if an inline asm
statement clobbers the stack pointer. Without the patch, x86 and
x86_64 builds will fail to compile gdb-7.6/gdb/common/linux-ptrace.c,
generating an error that indicates "error: Stack Pointer register
clobbered by '%rsp' in 'asm'".
(anderson(a)redhat.com)