Dracut has "--hostonly-cmdline" which can generate cmdlines(if any)
regarding the dump target, it's an existing way for us to use to
simplify the code. E.g. We already removed generate_lvm_cmdlines(),
to use "--hostonly-cmdline".
But "--hostonly-cmdline" has other issues(e.g. BZ1451717), it adds
needless devices for kdump like root device.
Now dracut supports "--no-hostonly-default-device" which enables
us to only add the kdump target, which can avoid needless devices
being recognized under kdump. Thus "--hostonly-cmdline" side effects
can be avoided with the help of "--no-hostonly-default-device".
This patch applies dracut's "--hostonly-cmdline" together with
"--no-hostonly-default-device" to achieve above-mentioned purpose.
Signed-off-by: Xunlei Pang <xlpang@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Added patch from panand which was accepted by upstream but not merged in upstream yet.
kexec-tools-2.0.15-makedumpfile-fix-SECTION_MAP_MASK-for-kernel-bigger-than-4.13.patch
https://bugzilla.redhat.com/show_bug.cgi?id=1474706
Makedumpfile failed with below error messages, which is caused by kernel changes 65ade2f872b474fa8a04c2d397783350326634e6:
Buffer size for the cyclic mode: 95992
vtop4_x86_64: Can't get the symbol of init_level4_pgt.
readmem: Can't convert a virtual address(ffffffff8fe18284) to physical address.
readmem: type_addr: 0, addr:ffffffff8fe18284, size:390
check_release: Can't get the address of system_utsname.
Pull in Pratyush's fix in upstream makedumpfile (not merged yet but acked by
maintainer)
Signed-off-by: Dave Young <dyoung@redhat.com>
This patch fixes the whitespace errors reported by
'rpmlint' or 'fedpkg lint' when they are run on kexec-tools srpm:
kexec-tools.spec:242: W: mixed-use-of-spaces-and-tabs (spaces: line 107,
tab: line 242)
Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
We met a problem that the kdump emergency service failed to
start when the target dump timeout(we passed "rd.timeout=30"
to kdump), it reported "Transaction is destructive" messages:
[ TIME ] Timed out waiting for device dev-mapper-fedora\x2droot.device.
[DEPEND] Dependency failed for Initrd Root Device.
[ SKIP ] Ordering cycle found, skipping System Initialization
[DEPEND] Dependency failed for /sysroot.
[DEPEND] Dependency failed for Initrd Root File System.
[DEPEND] Dependency failed for Reload Configuration from the Real Root.
[ SKIP ] Ordering cycle found, skipping System Initialization
[ SKIP ] Ordering cycle found, skipping Initrd Default Target
[DEPEND] Dependency failed for File System Check on /dev/mapper/fedora-root.
[ OK ] Reached target Initrd File Systems.
[ OK ] Stopped dracut pre-udev hook.
[ OK ] Stopped dracut cmdline hook.
Starting Setup Virtual Console...
Starting Kdump Emergency...
[ OK ] Reached target Initrd Default Target.
[ OK ] Stopped dracut initqueue hook.
Failed to start kdump-error-handler.service: Transaction is destructive.
See system logs and 'systemctl status kdump-error-handler.service' for details.
[FAILED] Failed to start Kdump Emergency.
See 'systemctl status emergency.service' for details.
[DEPEND] Dependency failed for Emergency Mode.
This is because in case of root failure, initrd-root-fs.target
will trigger systemd emergency target which requires the systemd
emergency service actually is kdump-emergency.service, then our
kdump-emergency.service starts kdump-error-handler.service with
"systemctl isolate"(see 99kdumpbase/kdump-emergency.service, we
replace systemd's with this one under kdump).
This will lead to systemd two contradictable jobs queued as an
atomic transaction:
job 1) the emergency service gets started by initrd-root-fs.target
job 2) the emergency service gets stopped due to "systemctl isolate"
thereby throwing "Transaction is destructive".
In order to solve it, we can utilize "IgnoreOnIsolate=yes" for both
kdump-emergency.service and kdump-emergency.target. Unit with attribute
"IgnoreOnIsolate=yes" won't be stopped when isolating another unit,
they can keep going as expected in case be triggered by any failure.
We add kdump-emergency.target dedicated to kdump the similar way
as did for kdump-emergency.service(i.e. will replace systemd's
emergency.target with kdump-emergency.target under kdump), and
adds "IgnoreOnIsolate=yes" into both of them.
Signed-off-by: Xunlei Pang <xlpang@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Acked-by: Pratyush Anand <panand@redhat.com>
[bhe: improve the patch log about IgnoreOnIsolate="]
Patches have been taken from kexec-tools and makedumpfile to fix issue
with `makedumpfile --mem-usage /proc/kcore`.
Two of the patches is from kexec-tools and rest are from makedumpfile.
All the patches have been acked upstream and applies without conflict.
Kexec-tools patches:
(kexec-tools-2.0.14-x86-x86_64-Fix-format-warning-with-die.patch), which
fixes koji build issue.
kexec-tools-2.0.14-build_mem_phdrs-check-if-p_paddr-is-invalid.patch fixes
the regresssion caused by kernel /proc/kcore fix to use -1 as default value
of p_paddr for pt_loads. Without his patch kexec -p will fail with latest
kernel.
Other makedumpfile patches are backported to support --mem-usage while
kernel kaslr being enabled. Details please see the patch log of the individual
patches.
All the patches are backport of upstream commits.
Patches has been tested with kernel 4.11.0-0.rc1.git0.1.fc26.x86_64.
# makedumpfile --mem-usage /proc/kcore -f
The kernel version is not supported.
The makedumpfile operation may be incomplete.
TYPE PAGES EXCLUDABLE DESCRIPTION
----------------------------------------------------------------------
ZERO 1960 yes Pages filled
with zero
NON_PRI_CACHE 22850 yes Cache pages
without private flag
PRI_CACHE 1517 yes Cache pages with
private flag
USER 32522 yes User process
pages
FREE 1898981 yes Free pages
KERN_DATA 78721 no Dumpable kernel
data
page size: 4096
Total pages on system: 2036551
Total size on system: 8341712896 Byte
We won't need to pass -f once fedora kernel is rebased with v4.12.
Signed-off-by: Pratyush Anand <panand@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Resolves: bz1399436
Since currently crashkernel= will be handled in kdump anaconda addon
we can safely remove rhcrashkernel-param callback.
Signed-off-by: Tong Li <tonli@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Backport upstream kexec-tools commit for correct kaslr page_offset value
commit 9f62cbddddfc93d78d9aafbddf3e1208cb242f7b
Author: Thomas Garnier <thgarnie@google.com>
Date: Tue Sep 13 15:10:05 2016 +0800
kexec/arch/i386: Add support for KASLR memory randomization
Multiple changes were made on KASLR (right now in linux-next). One of
them is randomizing the virtual address of the physical mapping, vmalloc
and vmemmap memory sections. It breaks kdump ability to read physical
memory.
This change identifies if KASLR memories randomization is used by
checking if the page_offset_base variable exists. It search for the
correct PAGE_OFFSET value by looking at the loaded memory section and
find the lowest aligned on PUD (the randomization level).
Related commits on linux-next:
- 0483e1fa6e09d4948272680f691dccb1edb9677f: Base for randomization
- 021182e52fe01c1f7b126f97fd6ba048dc4234fd: Enable for PAGE_OFFSET
Signed-off-by: Thomas Garnier <thgarnie@google.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Dave Young <dyoung@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
This is a short document about how to setup kdump on live images. All
steps were tested on Fedora 25 Alpha LiveCD and saved vmcore captured
by kdump to a USB stick successfully.
Signed-off-by: Tong Li <tonli@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
