Accepted crash 7.2.8-1 (source amd64) into unstable
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Hash: SHA256
Format: 1.8
Date: Tue, 11 Feb 2020 19:19:46 -0700
Source: crash
Binary: crash crash-dbgsym
Architecture: source amd64
Version: 7.2.8-1
Distribution: unstable
Urgency: medium
Maintainer: Troy Heber <troyh@debian.org>
Changed-By: Troy Heber <troyh@debian.org>
Description:
crash - kernel debugging utility, allowing gdb like syntax
Closes: 950544
Changes:
crash (7.2.8-1) unstable; urgency=medium
.
* New upstream (Closes: #950544)
.
* Fix for Linux 5.4-rc1 and later kernels that contain commit
688fcbfc06e4fdfbb7e1d5a942a1460fe6379d2d, titled "mm/vmalloc: modify
struct vmap_area to reduce its size". Without the patch "kmem -v" will
display nothing; other architectures that utilize the vmap_area_list to
determine the base of mapped/vmalloc address space will fail.
.
* Fix for Linux 5.4-rc1 and later kernels that contain commit/merge
e0703556644a531e50b5dc61b9f6ea83af5f6604, titled "Merge tag 'modules-
for-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux
which introduces symbol namespaces. Without the patch, and depending upon
the architecture:
(1) the kernel module symbol list will contain garbage entries
(2) the session fails during session initialization with a dump of
the internal buffer allocation stats followed by the message
"crash: cannot allocate any more memory!"
(3) the session fails during session initialization with a
segmentation violation.
.
* Fix for the "timer -r" option on Linux 5.4-rc1 and later kernels that
contain commit 511885d7061eda3eb1faf3f57dcc936ff75863f1, titled
"lib/timerqueue: Rely on rbtree semantics for next timer". Without the
patch, the option fails with the following error "timer: invalid structure
member offset: timerqueue_head_next".
.
* Fix for a "[-Wstringop-truncation]" compiler warning emitted when
symbols.c is built in a Fedora Rawhide environment with gcc-9.0.1 or
later.
.
* Fix for the "kmem -n" option on Linux-5.4-rc1 and later kernels that
contain commit b6c88d3b9d38f9448e0fcf44847a075ea81d5ca2, titled
"drivers/base/memory.c: don't store end_section_nr in memory blocks".
Without the patch, the command option fails with the error message "kmem:
invalid structure member offset: memory_block_end_section_nr".
.
* Fix for Linux 4.19.5 and later 4.19-based x86_64 kernels which are NOT
configured with CONFIG_RANDOMIZE_BASE and have backported kernel commit
d52888aa2753e3063a9d3a0c9f72f94aa9809c15, titled "x86/mm: Move LDT remap
out of KASLR region on 5-level paging", which modified the 4-level and
5-level paging PAGE_OFFSET values. Without this patch, the crash session
fails during initialization with the error message "crash: seek error:
kernel virtual address: <address> type: "tss_struct ist array".
.
* Additional fix for the "kmem -n" option on Linux-5.4-rc1 and later kernels
that contain commit b6c88d3b9d38f9448e0fcf44847a075ea81d5ca2, titled
"drivers/base/memory.c: don't store end_section_nr in memory blocks". The
initial fix only addressed the x86_64 architecture; this incremental patch
addresses the other architectures.
.
* In the unlikely event that the panic task in a dumpfile cannot be
determined by the normal means, scan the kernel log buffer for panic
keywords, and if found, generate the panic task from the CPU number that
is specified following the panic message.
.
* Adjust a crash-7.1.8 patch for support of /proc/kcore as the live memory
source in Linux 4.8 and later x86_64 kernels configured with
CONFIG_RANDOMIZE_BASE, which randomizes the unity-mapping PAGE_OFFSET
value. Since the problem only arises before the determination of the
randomized PAGE_OFFSET value, restrict the patch such that it only takes
effect during session initialization.
.
* Add support for extended numbering support in ELF dumpfiles to handle more
than PN_XNUM (0xffff) program headers. If the real number of program
header table entries is equal to or greater than PN_XNUM, the e_phnum
field of the ELF header is set to PN_XNUM, and the actual number is set in
the sh_info field of the section header at index 0.
.
* Fix for a "warning: large integer implicitly truncated to unsigned type
[-Woverflow]" compiler message generated on 32-bit architectures as a
result of the "Additional fix for the kmem -n option" patch above.
.
* Add support for handling openSUSE vmlinux files which will be shipped in
.xz compressed format. Without the patch, only gzip and bzip2 formats are
supported.
.
* Fix for the determination of the ARM64 page size on Linux 4.4 and earlier
kernels that do not have vmcoreinfo data. Without the patch, the crash
session fails during initialization with the error message "crash: "cannot
determine page size".
.
* Determine the ARM64 kernel's "vabits_actual" value by reading the new
TCR_EL1.T1SZ vmcoreinfo entry.
.
* Fix to determine the ARM64 kernel's "vabits_actual" value from the ELF
header of a dumpfile created with the "snap.so" extension module.
.
* Fix two typos in the examples section of the "help bt" display, which
mistakenly show "bf -f" and "bf -FF" instead of "bt -f" and "bt -FF".
.
* Similar to ARM64, the X86_64, PPC64 and S390x architectures will use the
exported value of MAX_PHYSMEM_BITS from the vmcoreinfo data as the
preferred method if it is available.
.
* If an S390X kernel crashes before vmcoreinfo initialization, there is no
way to extract the KASLR offset for such early dumps. In a new S390X
kernel patch, the KASLR offset will be stored in the lowcore memory during
early boot and then overwritten after vmcoreinfo is initialized. This
patch allows crash to identify the KASLR offset that is stored in the
lowcore memory.
.
* Fix for a crash-7.2.7 regression that determined the value of the ARM64
kernel SECTION_SIZE_BITS by reading the in-kernel configuration data if
there is no VMCOREINFO data available. In that case, without the patch, a
double-free exception may occur.
.
* Fix for segmentation violation if the gdb_readmem_callback() function gets
called from other than a crash command, such as from an epython command
from the mypkdump.so extension module.
.
* Fix for the "dis -s" option when running against kernels that have been
configured with CONFIG_RANDOMIZE_BASE=y (KASLR). Without the patch, the
command option indicates that the FILE and LINE numbers are "(unknown)",
and that "source code is not available".
.
* Fix for newer Xen hypervisors, which fail during initialization with the
error message "crash: cannot resolve init_tss". This is caused by a
change in the Xen hypervisor with commit 78884406256, from
4.12.0-rc5-763-g7888440625. In that patch the tss_struct structure was
renamed to tss64 and the tss_page structure was introduced, which contains
a single tss64. Now tss information is accessible via the symbol
"per_cpu__tss_page".
.
* When accessing the ARM64 kernel's "crash_notes" array, continue to read
the per-cpu NT_PRSTATUS note contents if an invalid note is encountered.
Without the patch, if an invalid note is found, all other notes were
ignored, and subsequent "bt" attempts on the active tasks would fail.
.
* When accessing the 32-bit ARM kernel's "crash_notes" array, continue to
read the per-cpu NT_PRSTATUS note contents if an invalid note is
encountered. Without the patch, if an invalid note is found, all other
notes were ignored, and subsequent "bt" attempts on the active tasks would
fail.
.
* Fix for the "log -a" option. The kernel's sk_buff.len field is a 32-bit
unsigned int, but crash was reading its 32-bit value into a 64-bit
unsigned long stack variable. All extra bits that pre-existed in the
upper 32-bits of the stack variable were passed along as part of a buffer
size request; if the upper 32-bit bits were non-zero, then the command
would fail with a dump of the internal buffer allocation stats followed by
the message "log: cannot allocate any more memory!".
.
* When determining the ARM64 kernel's "vabits_actual" value by reading the
new TCR_EL1.T1SZ vmcoreinfo entry, display its value during session
initialization only when invoking crash with "-d1" or larger -d debug
value.
.
* Update copyright to 2020 in crash version output.
.
* Fix for ARM64 when running against Linux 5.5-rc1 and later kernels that
contain commit b6e43c0e3129ffe87e65c85f20fcbdf0eb86fba0, titled "arm64:
remove __exception annotations". Without the patch, the ARM64 crash
session fails during initialization with the error message "crash: cannot
resolve __exception_text_start".
.
* Fix for support of ELF format kdump vmcores from S390X KASLR kernels.
Without the patch, the crash session fails during initialization with the
error message "crash: vmlinux and vmcore do not match!".
.
* Fix for support of S390X standalone dumpfiles and LKCD dumpfiles that were
taken from S390X KASLR kernels.
.
* Rework the previous patch for support of S390X standalone dumpfiles and
LKCD dumpfiles that were taken from S390X KASLR kernels to avoid calling
an s390x-specific function from generic code.
.
* Fix for a gcc-10 compilation error. Without the patch, the build of the
crash library fails with a stream of error messages indicating "multiple
definition of 'diskdump_flags'"
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