Oleg Nesterov
b03023ecbd
coredump: add %i/%I in core_pattern to report the tid of the crashed thread ...
format_corename() can only pass the leader's pid to the core handler,
but there is no simple way to figure out which thread originated the
coredump.
As Jan explains, this also means that there is no simple way to create
the backtrace of the crashed process:
As programs are mostly compiled with implicit gcc -fomit-frame-pointer
one needs program's .eh_frame section (equivalently PT_GNU_EH_FRAME
segment) or .debug_frame section. .debug_frame usually is present only
in separate debug info files usually not even installed on the system.
While .eh_frame is a part of the executable/library (and it is even
always mapped for C++ exceptions unwinding) it no longer has to be
present anywhere on the disk as the program could be upgraded in the
meantime and the running instance has its executable file already
unlinked from disk.
One possibility is to echo 0x3f >/proc/*/coredump_filter and dump all
the file-backed memory including the executable's .eh_frame section.
But that can create huge core files, for example even due to mmapped
data files.
Other possibility would be to read .eh_frame from /proc/PID/mem at the
core_pattern handler time of the core dump. For the backtrace one needs
to read the register state first which can be done from core_pattern
handler:
ptrace(PTRACE_SEIZE, tid, 0, PTRACE_O_TRACEEXIT)
close(0); // close pipe fd to resume the sleeping dumper
waitpid(); // should report EXIT
PTRACE_GETREGS or other requests
The remaining problem is how to get the 'tid' value of the crashed
thread. It could be read from the first NT_PRSTATUS note of the core
file but that makes the core_pattern handler complicated.
Unfortunately %t is already used so this patch uses %i/%I.
Automatic Bug Reporting Tool (https://github.com/abrt/abrt/wiki/overview )
is experimenting with this. It is using the elfutils
(https://fedorahosted.org/elfutils/ ) unwinder for generating the
backtraces. Apart from not needing matching executables as mentioned
above, another advantage is that we can get the backtrace without saving
the core (which might be quite large) to disk.
[mmilata@redhat.com: final paragraph of changelog]
Signed-off-by: Jan Kratochvil <jan.kratochvil@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Jan Kratochvil <jan.kratochvil@redhat.com>
Cc: Mark Wielaard <mjw@redhat.com>
Cc: Martin Milata <mmilata@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-10-14 02:18:21 +02:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux
2014-10-11 20:34:00 -04:00
Documentation: use subdir-y to avoid unnecessary built-in.o files
2014-09-26 11:02:55 +02:00
ACPI / documentation: Remove reference to acpi_platform_device_ids from enumeration.txt
2014-07-12 00:07:05 +02:00
ARM: SoC DT updates for 3.18
2014-10-08 17:22:23 -04:00
KVM/ARM New features for 3.17 include:
2014-08-05 09:47:45 +02:00
Documentation: use subdir-y to avoid unnecessary built-in.o files
2014-09-26 11:02:55 +02:00
backlight: lp855x_bl: support new LP8555 device
2013-11-13 12:09:14 +09:00
Documentation: add makefiles for more targets
2014-09-26 11:02:56 +02:00
doc: queue-sysfs: minor fixes
2014-08-28 14:47:22 +02:00
zram: report maximum used memory
2014-10-09 22:26:02 -04:00
cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags
2014-09-24 22:16:06 -04:00
w1: optional bundling of netlink kernel replies
2014-05-27 13:56:21 -07:00
intel_pstate: Update documentation of {max,min}_perf_pct sysfs files
2014-07-07 01:22:19 +02:00
dm switch: efficiently support repetitive patterns
2014-08-01 12:30:37 -04:00
rtc: bq32000: add trickle charger device tree binding
2014-10-14 02:18:18 +02:00
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-10-13 15:51:40 +02:00
PCI changes for the v3.18 merge window:
2014-10-09 15:03:49 -04:00
[media] get_dvb_firmware: Update firmware of ITEtech IT9135
2014-09-21 17:03:04 -03:00
drm: Add 800x600 (SVGA) screen resolution to the built-in EDIDs
2014-05-26 12:53:40 +10:00
extcon: fix switch class porting guide (Documentation)
2014-01-07 11:54:28 +09:00
doc: spelling error changes
2014-05-05 15:32:05 +02:00
autofs: the documentation I wanted to read
2014-10-14 02:18:17 +02:00
doc: fix minor typos in firmware_class README
2014-07-17 18:43:40 -07:00
FMC: make eeprom attribute writable
2014-02-28 15:12:08 -08:00
This is the bulk of GPIO changes for the v3.18 development
2014-10-09 14:58:15 -04:00
HID: uhid: update documentation
2014-08-25 03:28:09 -05:00
Immutable branch between MFD, HWMON, LEDs and Watchdog for v3.18
2014-09-24 09:25:06 -07:00
Documentation: i2c: rename variable "register" to "reg"
2014-09-07 15:21:13 -07:00
Documentation: use subdir-y to avoid unnecessary built-in.o files
2014-09-26 11:02:55 +02:00
Documentation/: update 00-INDEX files
2014-02-10 16:01:40 -08:00
IB/mad: add new ioctl to ABI to support new registration options
2014-08-10 20:36:00 -07:00
Merge branch 'next' into for-linus
2014-08-06 23:36:12 -07:00
cxl: Add documentation for userspace APIs
2014-10-08 20:16:19 +11:00
Documentation: Update stable address in Chinese and Japanese translations
2014-04-16 14:13:27 -07:00
Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
2014-08-14 11:14:29 -06:00
Documentation/kdump/kdump.txt: add ARM description
2014-08-29 16:28:17 -07:00
Documentation: HOWTO: Updates on subsystem trees, patchwork, -next (vs. -mm) in ko_KR
2014-01-08 15:32:51 -08:00
Documentation: update .gitignore files
2014-09-26 11:02:59 +02:00
Documentation/: update 00-INDEX files
2014-02-10 16:01:40 -08:00
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-10-13 15:51:40 +02:00
Documentation/: update 00-INDEX files
2014-02-10 16:01:40 -08:00
Documentation: update include path for mpssd
2014-10-03 15:48:20 +02:00
Documentation: au1xxx-ide.c has moved
2014-08-26 09:35:53 +02:00
Documentation: use subdir-y to avoid unnecessary built-in.o files
2014-09-26 11:02:55 +02:00
MTD updates for 3.16:
2014-06-11 08:35:34 -07:00
Documentation: replace __sk_run_filter with __bpf_prog_run
2014-10-10 15:10:50 -04:00
doc: replace "practise" with "practice" in Documentation
2014-06-19 15:28:56 +02:00
Documentation: use subdir-y to avoid unnecessary built-in.o files
2014-09-26 11:02:55 +02:00
phy: Add new Exynos USB 2.0 PHY driver
2014-03-08 12:39:44 +05:30
Documentation: Add list of laptop models supported by the Compal driver
2014-06-10 19:11:06 -04:00
Merge branch 'pm-genirq'
2014-10-07 01:17:21 +02:00
cxl: Add documentation for userspace APIs
2014-10-08 20:16:19 +11:00
Documentation: update .gitignore files
2014-09-26 11:02:59 +02:00
Documentation: update .gitignore files
2014-09-26 11:02:59 +02:00
rapidio/tsi721_dma: rework scatter-gather list handling
2014-08-08 15:57:24 -07:00
documentation: Add verbiage on RCU-tasks stall warning messages
2014-09-07 16:27:28 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial into next
2014-06-04 08:50:34 -07:00
Documentation/scheduler/sched-deadline.txt: Add minimal main() appendix
2014-09-16 10:23:45 +02:00
megaraid_sas: Version and Changelog update
2014-09-16 09:09:54 -07:00
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
2014-10-12 10:13:55 -04:00
TTY/Serial driver patches for 3.18-rc1
2014-10-08 06:52:11 -04:00
ALSA: virtuoso: add Xonar Essence STX II support
2014-08-04 15:20:48 +02:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/doc
2014-10-07 21:14:57 -04:00
coredump: add %i/%I in core_pattern to report the tid of the crashed thread
2014-10-14 02:18:21 +02:00
drm/nouveau/doc: update the thermal documentation
2014-06-17 14:50:17 +10:00
Documentation: update .gitignore files
2014-09-26 11:02:59 +02:00
mm: trace-vmscan-postprocess.pl: report the number of file/anon pages respectively
2014-08-06 18:01:20 -07:00
usb: hub: rename khubd to hub_wq in documentation and comments
2014-09-23 22:33:19 -07:00
Documentation: disable vdso_test to avoid breakage with old glibc
2014-09-26 11:03:00 +02:00
media updates for v3.18-rc1
2014-10-10 22:04:49 -04:00
Changes for KVM for arm/arm64 for 3.18
2014-09-27 11:03:33 +02:00
mm: mark remap_file_pages() syscall as deprecated
2014-06-06 16:08:17 -07:00
w1: new w1_ds2406 driver
2014-06-19 17:45:14 -07:00
Documentation: use subdir-y to avoid unnecessary built-in.o files
2014-09-26 11:02:55 +02:00
x86/doc: Fix the 'tlb_single_page_flush_ceiling' sysconfig path
2014-08-10 09:09:26 +02:00
xtensa: remap io area defined in device tree
2014-01-15 00:25:14 +04:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2014-08-06 21:03:53 -07:00
locking/Documentation: Move locking related docs into Documentation/locking/
2014-08-13 10:32:03 +02:00
Documentation: change "&" to "and" in Documentation/applying-patches.txt
2014-09-26 11:10:11 +02:00
KEYS: Fix multiple key add into associative array
2013-12-02 11:24:18 +00:00
arch,doc: Convert smp_mb__*()
2014-04-18 14:20:48 +02:00
binfmt_misc: touch up documentation a bit
2014-10-14 02:18:16 +02:00
Documentation: remove obsolete pcmcia-cs from Changes
2014-09-09 10:35:58 +02:00
documentation: Update circular buffer for load-acquire/store-release
2013-12-03 10:08:57 -08:00
clk: Improve clk_ops documentation
2014-05-12 17:08:33 -07:00
CodingStyle: fix a minor typo
2014-08-26 09:35:54 +02:00
Doc/cpu-hotplug: Specify race-free way to register CPU hotplug callbacks
2014-03-20 13:43:40 +01:00
firewire: revert to 4 GB RDMA, fix protocols using Memory Space
2014-05-29 15:50:30 +02:00
Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
2014-04-04 09:50:07 -07:00
Documentation: correct parameter error for dma_mapping_error
2014-09-26 11:22:29 +02:00
DMA-API: Capitalize "CPU" consistently
2014-05-26 17:28:27 -06:00
doc: spelling error changes
2014-05-05 15:32:05 +02:00
Documentation/dma-buf-sharing.txt: update API descriptions
2014-08-28 11:57:24 +05:30
DMA-API: Clarify physical/bus address distinction
2014-05-20 16:54:21 -06:00
dmaengine: Clarify device parameter for dma_sync_*_for_*()
2014-07-25 14:21:23 +05:30
dmatest: add a 'wait' parameter
2013-11-14 11:04:40 -08:00
Documentation: LLVMLinux: Update Documentation/dontdiff
2014-04-09 13:44:34 -07:00
doc: spelling error changes
2014-05-05 15:32:05 +02:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial into next
2014-06-04 08:50:34 -07:00
doc: arm64: add description of EFI stub support
2014-04-30 19:57:05 +01:00
Documentation: add section about git to email-clients.txt
2014-06-29 13:38:33 -07:00
doc: fix double words
2014-03-21 13:16:58 +01:00
gcov: compile specific gcov implementation based on gcc version
2013-11-13 12:09:34 +09:00
Documentation: HOWTO: Update broken links to tpp
2013-12-10 23:09:08 -08:00
Documentation: HSI: Add some general description for the HSI subsystem
2014-05-04 09:49:46 +02:00
doc: fix some typos
2013-12-02 14:48:28 +01:00
genirq: Improve documentation to match current implementation
2014-05-27 10:16:44 +02:00
asm/system.h: clean asm/system.h from docs
2014-04-07 16:36:11 -07:00
Documentation: update java sample wrapper for java 7
2014-05-25 12:39:00 -07:00
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-10-13 15:44:12 +02:00
Documentation/kernel-per-CPU-kthreads.txt: Workqueue affinity
2014-02-17 14:56:08 -08:00
doc: fix double words
2014-03-21 13:16:58 +01:00
Documentation: kmemleak: correct spelling mistake
2014-08-26 09:35:53 +02:00
kobject: remove kset from sysfs immediately in kset_unregister()
2013-12-07 21:20:11 -08:00
kprobes: Introduce NOKPROBE_SYMBOL() macro to maintain kprobes blacklist
2014-04-24 10:02:56 +02:00
lockup-watchdogs: Fix a typo
2014-08-26 09:35:52 +02:00
Documentation: lzo: document part of the encoding
2014-09-28 11:08:00 +02:00
Documentation/serial: Delete obsolete driver documentation
2014-04-16 14:20:34 -07:00
Documentation: add makefiles for more targets
2014-09-26 11:02:56 +02:00
doc: fix some typos in documentations
2013-12-02 14:45:19 +01:00
memory-barriers: Fix description of 2-legged-if-based control dependencies
2014-09-07 16:15:53 -07:00
memory-hotplug: add sysfs valid_zones attribute
2014-10-09 22:25:52 -04:00
Nothing major: the stricter permissions checking for sysfs broke
2014-04-06 09:38:07 -07:00
panic: add TAINT_SOFTLOCKUP
2014-08-08 15:57:24 -07:00
phy: core: Let node ptr of PHY point to PHY and not of PHY provider
2014-07-22 12:46:11 +05:30
pinctrl: clean up after enable refactoring
2014-09-04 10:05:07 +02:00
doc: printk-formats: do not mention casts for u64/s64
2014-05-05 15:32:42 +02:00
pwm: modify PWM_LOOKUP to initialize all struct pwm_lookup members
2014-05-21 11:19:36 +02:00
doc: spelling error changes
2014-05-05 15:32:05 +02:00
doc: spelling error changes
2014-05-05 15:32:05 +02:00
Documentation/robust-futex-API: Count properly to 4
2013-11-30 14:08:28 +01:00
doc: spelling error changes
2014-05-05 15:32:05 +02:00
stable_kernel_rules: Add pointer to netdev-FAQ for network patches
2014-07-09 15:54:27 -07:00
doc: fix some typos in documentations
2013-12-02 14:45:19 +01:00
doc: SubmittingPatches: remove dead link, kerneltrap.org no longer works
2014-06-19 15:15:27 +02:00
Documentation: new page link in SubmittingPatches
2014-09-07 15:21:13 -07:00
Documentation/sysfs-rules.txt: Add device attribute error code documentation
2014-09-19 14:44:51 -07:00
Docs: this_cpu_ops: remove redundant add forms
2014-09-26 11:03:00 +02:00
ether_addr_equal: Optimize implementation, remove unused compare_ether_addr
2013-12-06 16:37:43 -05:00
drivers/vfio: EEH support for VFIO PCI device
2014-08-05 15:28:48 +10:00
VME: Rename vme_slot_get to avoid confusion with reference counting
2013-12-03 11:15:58 -08:00
xillybus: Move out of staging
2014-09-23 23:44:16 -07:00
zorro/UAPI: Disintegrate include/linux/zorro*.h
2013-11-26 11:09:08 +01:00
b03023ecbd
