Accepted crash 7.2.9-1 (source amd64) into unstable
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Hash: SHA256
Format: 1.8
Date: Thu, 03 Dec 2020 09:53:49 -0700
Source: crash
Binary: crash crash-dbgsym
Architecture: source amd64
Version: 7.2.9-1
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: 976195
Changes:
crash (7.2.9-1) unstable; urgency=medium
.
* Patch from Sebastian Andrzej Siewior <sebastian@breakpoint.cc>: The crash
project moved recently to github. The attached patch updates the
information within the package. It also adds a watch file which points to
the latest release (closes: #976195)
.
* Fix for an ARM64 gcc-10 compilation error. Without the patch, the build
of the embedded gdb module fails with an error message that indicates
"multiple definition of 'tdesc_aarch64'".
.
* Fix for the "log" command. Without the patch, the command's output may be
truncated, ending with the error message "log: invalid log_buf entry
encountered".
.
* Fix to allow the translation of ARM64 FIXMAP addresses located in the
virtual memory region between the end of the vmalloc region and the
beginning of the vmemmap region. Without the patch, reads of virtual
addresses within that region are not recognized properly and will fail.
.
* Introduction of a new "extend -s" option, which shows all available shared
object extension modules that are located in the directories that are part
of the normal search path that is used when a shared object is loaded
without a fully-qualified pathname.
.
* Fix for the "bpf -m|-M" options on Linux 5.3 and later kernels that
contain commit 3539b96e041c06e4317082816d90ec09160aeb11, titled "bpf:
group memory related fields in struct bpf_map_memory". Without the patch,
the options prints "(unknown)" for MEMLOCK and UID.
.
* Enhancement to the "bpf -p|-P" options to display the eBPF program name
string.
.
* Fix for reading compressed kdump dumpfiles from systems with physical
memory located at extraordinarily high addresses. In a system with a
physical address range from 0x602770ecf000 to 0x6027ffffffff, the crash
utility fails during session initialization due to an integer overflow,
ending with the error message "crash: vmlinux and vmcore do not match!".
.
* Enhancement of the "struct -r" option to support the raw memory display of
a single data structure member. Without the patch, the option only
supported the raw display of a complete data structure.
.
* Modify the display behavior of the "struct -r" option so as to scale the
minimum display size from the size of a per-architecture long (32-bits or
64-bits) down to 8-bits, 16-bits or 32-bits when the requested size is
equal to one of the smaller sizes.
.
* Introduce a new ARM64 "--machdep vabits_actual=<value>" command line
option for Linux 5.4 and later dumpfiles, which require the kernel's
dynamically-determined "vabits_actual" value for virtual address
translation. Without the patch, the crash session fails during
initialization with the error message "crash: cannot determine
VA_BITS_ACTUAL". This option will become unnecessary when the proposed
TCR_EL1.T1SZ vmcoreinfo entry is incorporated into the kernel.
.
* Fix for "kmem -[sS]" options on Linux 4.14 and later kernels built with
CONFIG_SLAB_FREELIST_HARDENED enabled. Without the patch, there will error
messages of the type "kmem: <cache name> slab: <address> invalid
freepointer: <obfuscated address>" for caches created during SLUB
bootstrap, as they are likely to have s->random == 0.
.
* If readmem() receives a user-space address in a page that has been swapped
to the zswap compressed swap cache, an attempt will be made to find and
decompress the page.
.
* Fix for the "mount -n [pid|task]" option when running on a live system.
Without the patch, if the [pid|task] has been created since the last
internal task table refresh, the command fails with the error message
"mount: invalid task or pid value: <value>".
.
* Introduction of the "log -T" option, which translates the leading
timestamp value of each message into human readable format.
.
* When kernels are built with LLVM, the names of many symbols may be
appended with an ".llvm.<number>" string. As a result, commands such as
"irq" fail with the error message irq: neither irq_desc, _irq_desc,
irq_desc_ptrs or irq_desc_tree symbols exist". This patch adds the
LLVM-generated string to the other strings that are stripped from symbols
before they are stored.
.
* Prepare for the introduction of ARM64 8.3 Pointer Authentication as
in-kernel feature. The value of CONFIG_ARM64_KERNELPACMASK will be
exported as a vmcoreinfo entry, and will be used with text return
addresses on the kernel stack.
.
* Several fixes for ARM64 kernels:
(1) Linux kernel patch "arm64: mm: Introduce vabits_actual"
introduced "physvirt_offset", which is not equal to
(PHYS_OFFSET - PAGE_OFFSET) when KASLR is enabled.
physvirt_offset is caculated in arch/arm64/mm/init.c
before memstart_addr (PHYS_OFFSET) is randomized. Let
arm64_VTOP() and arm64_PTOV() use physvirt_offset instead,
whose default value is set to (phys_offset - page_offset)
(2) For ARM64 RAM dumps without any vmcoreinfo and KASLRpassed as
argument, " _stext_vmlinux" is not set. This causes incorrect
calculation of vmalloc_start with VA_BITS_ACTUAL.
(3) For ARM64 RAM dumps For ramdumps without vmcoreinfo, get
CONFIG_ARM64_VA_BITS from in-kernel config. Without this,
vmemmap size is calculated incorrectly.
(4) Fix the vmemmap_start to match with what the kernel uses.
.
* Replace people.redhat.com references with github equivalents.
.
* Implement support for user-space zram reads on x86_64 for recent
Fedora kernel version 5.6.7-200.fc31. The patch adds the following:
(1) Redefine _PFN_BITS() macro to use MAX_POSSIBLE_PHYSMEM_BITS.
(2) Fix to determine whether address_space.i_pages is a radix tree
or an xarray.
(3) Fix to not mistakenly select the "lzo" compressor when the
kernel has used the default "lzo-rle" compressor.
(4) Since zram may be provided as a kernel module, it would be
necessary to load its debuginfo during the crash session;
therefore perform the zram structure-size/member-offset
initializations when first required instead of during
session initialization.
(5) Handle the zram_table_entry structure member name change
from "value" to "flags".
.
* Add support for 1GB huge pages to "vtop" command on x86_64. Without this
patch, the command with a user virtual address corresponding to a 1GB huge
page fails with the error message "vtop: seek error: physical address:
<address> type: "page table".
.
* Fix six spelling typos in help.c.
.
* Change tcr_el1_t1sz vmcoreinfo entry name to TCR_EL1_T1SZ according to
kernel commit bbdbc11804ff ("arm64/crash_core: Export TCR_EL1.T1SZ in
vmcoreinfo").
.
* Fix for a failure of calculating kaslr_offset due to an sadump format
restriction. Without the patch set, calculating kaslr_offset fails
because it is based on the assumption that unused part of register values
in the sadump format are always zero cleared.
.
* Support for huge holes in vmem of VMware VMSS dumpfiles. Without the
patch, if the hole is big enough, the multiplication by page size will
truncate as it's operating on a uint32_t.
.
* Beautify and extend debug log for VMware VMSS dumpfiles. Without the
patch, the parser's debug log is missing a few line breaks as well as some
crucial information, like control register dumps.
.
* Support core files with unusual layout that the ELF program headers do not
directly follow the ELF header, such as vmcores generated with 'vmss2core'
tool.
.
* Fix for the "log -T" option when crash is started with "--minimal" option.
Without the patch, crash will spin at 100% and continuously crash at a
divide by zero. Disallow the option in minimal mode.
.
* Remove raw-view from s390bpf. With kernel commit ecb1ff6833c4
("s390/debug: remove raw view"), the raw-view is no longer supported by
s390 debug feature. Since there has never been a single user of the
raw-view, remove it from crash as well.
.
* Support s390 debug feature version 3, which was introduced by kernel
commit 0990d836cecb ("s390/debug: debug feature version 3").
.
* Basic support for PaX's split module layout. PaX and grsecurity kernels
split module memory into dedicated r/x and r/w mappings using '*_rw' and
'*_rx' named member variables in 'struct module'. To add basic support
for such kernels, detect the split layout by testing for the corresponding
structure members and use these instead.
.
* Fix for the "kmem -i" option on Linux 5.9-rc1 and later kernels that
contain commit 1008fe6dc36d ("block: remove the all_bdevs list"). Without
the patch, the option fails halfway with the error message 'kmem: cannot
resolve: "all_bdevs"'.
.
* Fix for the "irq -a" option on Linux 4.3 or later kernels that contain
commit 9df872faa7e1 ("genirq: Move field 'affinity' from irq_data into
irq_common_data"). Without the patch, the option cannot work with the
message "irq: -a option not supported or applicable on this architecture
or kernel".
.
* Append time zone explicitly to each output of date and time like "DATE:
Thu Nov 29 06:44:02 JST 2018".
.
* Fixes for the "trace.so" extension module on Linux 5.6 and later kernels
that contain commit: (1) 1c5eb4481e01 ("tracing: Rename trace_buffer to
array_buffer") (2) 13292494379f ("tracing: Make struct ring_buffer less
ambiguous") With the patch set, rename trace_buffer to array_buffer and
ring_buffer to trace_buffer respectively.
.
* Fix for the "help -D" option listing uninteresting register entries for
SADUMP dumpfiles.
.
* Fix for an initialization-time failure due to offset change of the name
member of struct uts_namespace that might be introduced by linux-next
commit 9a56493f6942 ("uts: Use generic ns_common::count").
.
* Add support for VMware guestdump (debug.guest) and vmem (debug.vmem)
files. To use, the companion debug.vmem file must be present in the same
directory as the debug.guest file.
.
* Fix for the "extend" command on a PPC64 targeted x86_64 crash binary.
Without the patch, the command on an x86_64 crash binary that can be used
to analyze ppc64le dumpfiles fails with the error message "extend: <path
to extension>: not an ELF format object".
.
* Fix for a failure to match arm/aarch64 ELF format of xendump file.
.
* Fix for the x86_64 "bt" command in cases where the pt_regs is not present
in the stack. Without the patch, the command can be incomplete with the
error message 'bt: seek error: kernel virtual address: <address> type:
"pt_regs"'.
.
* Fix for the crash.ko memory driver build with Linux 5.8 and later kernels
that contain commit fe557319aa06 ("maccess: rename
probe_kernel_{read,write} to copy_{from,to}_kernel_nofault").
Additionally, due to commit 0493cb086353 ("maccess: unexport
probe_kernel_write()"), writing kernel memory is no longer possible from a
module. Without this patch, build with the kernels fails with the error
message "error: implicit declaration of function 'probe_kernel_write'".
.
* Fix for the memory_driver/Makefile for Linux 5.4 and later kernels that
contain commit 7e35b42591c0 ("kbuild: remove SUBDIRS support"). Without
the patch, the "make" command in the memory_driver directory doesn't build
crash memory driver module as expected.
.
* Improvements of KASLR offset detection for QEMU, VMware VMSS and SADUMP
dumpfiles: (1) Try all CPUs to provide CR3 and IDTR, because these
registers on CPU0 can be not initialized or clobbered. (2) Support
5-level page table by using LA57 bit in CR4. (3) Get KASLR offset by
walking page tree.
.
* Fix for an initialization-time failure with QEMU dumpfiles with Linux
5.8 and later x86_64 kernels that contain commit 9d06c4027f21 ("x86/entry:
Convert Divide Error to IDTENTRY"), renamed divide_error handler to
asm_exc_divide_error.
.
* Fix for several compiler warnings on 32-bit architectures when building
with "make warn". Without the patch, gcc generates the message "warning:
format '%ld' expects argument of type 'long int', but argument 4 has type
'uint64_t' [-Wformat=]" and similar ones as a result of crash commit
3fedbee9bfbb ("vmware_guestdump: new input format").
.
* Speed up session initialization by avoiding unnecessary processing in the
stkptr_to_task() function when sp is 0 on some architectures. Without the
patch, as it runs through each task's stack to find whether the given
address is in its range, on a system with about
1500 CPUs and 165k running tasks, it takes about a day to finish session
initialization. With the patch applied, it only takes about 5-10 minutes.
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