[Bug 1248289] Re: Missing libunwind support in perf

[Mark Sonnabaum]

I also just ran into this using hwe on xenial 16.04.2.

perf in the stock 16.04.2 is linked to libdw, libunwind, libbfd, and
libbz2, all of which are missing after switching to hwe with the 4.8
kernel.

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[Bug 1248289] Re: Missing libunwind support in perf

[Jon Gjengset]

For what it's worth, recompiling `perf` from source fixes the problem.

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[Bug 1248289] Re: Missing libunwind support in perf

[Jon Gjengset]

In fact, on Yakkety with 4.8.0-34, the results of running perf --call-
graph are even more bizarre:

$ perf record --call-graph dwarf sleep 1
Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event 
(cycles).
/bin/dmesg may provide additional information.
No CONFIG_PERF_EVENTS=y kernel support configured?
$ grep -i config_perf_events /boot/config-$(uname -r)
CONFIG_PERF_EVENTS=y
CONFIG_PERF_EVENTS_INTEL_UNCORE=y
CONFIG_PERF_EVENTS_INTEL_RAPL=m
CONFIG_PERF_EVENTS_INTEL_CSTATE=m
# CONFIG_PERF_EVENTS_AMD_POWER is not set

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[Bug 1248289] Re: Missing libunwind support in perf

[Reimar Döffinger]

This either was never fixed or broke again, perf links neither against 
libunwind or libdw:
$ ldd /usr/lib/linux-tools/4.8.0-37-generic/perf 
linux-vdso.so.1 =>  (0x7ffee7766000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 
(0x7efec8bb9000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x7efec89b1000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x7efec86a8000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x7efec84a4000)
libelf.so.1 => /usr/lib/x86_64-linux-gnu/libelf.so.1 
(0x7efec828c000)
libaudit.so.1 => /lib/x86_64-linux-gnu/libaudit.so.1 
(0x7efec8062000)
libslang.so.2 => /lib/x86_64-linux-gnu/libslang.so.2 
(0x7efec7cd7000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x7efec7abd000)
liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x7efec789a000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x7efec74d3000)
/lib64/ld-linux-x86-64.so.2 (0x564e0db72000)
libcap-ng.so.0 => /lib/x86_64-linux-gnu/libcap-ng.so.0 
(0x7efec72ce000)

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[Bug 1248289] Re: Missing libunwind support in perf

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.4.0-24.43

---
linux (4.4.0-24.43) xenial; urgency=low

  [ Kamal Mostafa ]

  * CVE-2016-1583 (LP: #1588871)
- ecryptfs: fix handling of directory opening
- SAUCE: proc: prevent stacking filesystems on top
- SAUCE: ecryptfs: forbid opening files without mmap handler
- SAUCE: sched: panic on corrupted stack end

  * arm64: statically link rtc-efi (LP: #1583738)
- [Config] Link rtc-efi statically on arm64

 -- Kamal Mostafa   Fri, 03 Jun 2016 10:02:16 -0700

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[Bug 1248289] Re: Missing libunwind support in perf

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.4.0-24.43

---
linux (4.4.0-24.43) xenial; urgency=low

  [ Kamal Mostafa ]

  * CVE-2016-1583 (LP: #1588871)
- ecryptfs: fix handling of directory opening
- SAUCE: proc: prevent stacking filesystems on top
- SAUCE: ecryptfs: forbid opening files without mmap handler
- SAUCE: sched: panic on corrupted stack end

  * arm64: statically link rtc-efi (LP: #1583738)
- [Config] Link rtc-efi statically on arm64

 -- Kamal Mostafa   Fri, 03 Jun 2016 10:02:16 -0700

** Changed in: linux (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1583

** Changed in: linux (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

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[Bug 1248289] Re: Missing libunwind support in perf

[Shikhar Bhardwaj]

Hi,

When will this bugfix be released for Xenial?

Thanks

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  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.4.0-23.41

---
linux (4.4.0-23.41) xenial; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
- LP: #1582431

  * zfs: disable module checks for zfs when cross-compiling (LP: #1581127)
- [Packaging] disable zfs module checks when cross-compiling

  * Xenial update to v4.4.10 stable release (LP: #1580754)
- Revert "UBUNTU: SAUCE: (no-up) ACPICA: Dispatcher: Update thread ID for
  recursive method calls"
- Revert "UBUNTU: SAUCE: nbd: ratelimit error msgs after socket close"
- Revert: "powerpc/tm: Check for already reclaimed tasks"
- RDMA/iw_cxgb4: Fix bar2 virt addr calculation for T4 chips
- ipvs: handle ip_vs_fill_iph_skb_off failure
- ipvs: correct initial offset of Call-ID header search in SIP persistence
  engine
- ipvs: drop first packet to redirect conntrack
- mfd: intel-lpss: Remove clock tree on error path
- nbd: ratelimit error msgs after socket close
- ata: ahci_xgene: dereferencing uninitialized pointer in probe
- mwifiex: fix corner case association failure
- CNS3xxx: Fix PCI cns3xxx_write_config()
- clk-divider: make sure read-only dividers do not write to their register
- soc: rockchip: power-domain: fix err handle while probing
- clk: rockchip: free memory in error cases when registering clock branches
- clk: meson: Fix meson_clk_register_clks() signature type mismatch
- clk: qcom: msm8960: fix ce3_core clk enable register
- clk: versatile: sp810: support reentrance
- clk: qcom: msm8960: Fix ce3_src register offset
- lpfc: fix misleading indentation
- ath9k: ar5008_hw_cmn_spur_mitigate: add missing mask_m & mask_p
  initialisation
- mac80211: fix statistics leak if dev_alloc_name() fails
- tracing: Don't display trigger file for events that can't be enabled
- MD: make bio mergeable
- Minimal fix-up of bad hashing behavior of hash_64()
- mm, cma: prevent nr_isolated_* counters from going negative
- mm/zswap: provide unique zpool name
- ARM: EXYNOS: Properly skip unitialized parent clock in power domain on
- ARM: SoCFPGA: Fix secondary CPU startup in thumb2 kernel
- xen: Fix page <-> pfn conversion on 32 bit systems
- xen/balloon: Fix crash when ballooning on x86 32 bit PAE
- xen/evtchn: fix ring resize when binding new events
- HID: wacom: Add support for DTK-1651
- HID: Fix boot delay for Creative SB Omni Surround 5.1 with quirk
- Input: zforce_ts - fix dual touch recognition
- proc: prevent accessing /proc//environ until it's ready
- mm: update min_free_kbytes from khugepaged after core initialization
- batman-adv: fix DAT candidate selection (must use vid)
- batman-adv: Check skb size before using encapsulated ETH+VLAN header
- batman-adv: Fix broadcast/ogm queue limit on a removed interface
- batman-adv: Reduce refcnt of removed router when updating route
- writeback: Fix performance regression in wb_over_bg_thresh()
- MAINTAINERS: Remove asterisk from EFI directory names
- x86/tsc: Read all ratio bits from MSR_PLATFORM_INFO
- ARM: cpuidle: Pass on arm_cpuidle_suspend()'s return value
- ARC: Add missing io barriers to io{read,write}{16,32}be()
- x86/sysfb_efi: Fix valid BAR address range check
- ACPICA: Dispatcher: Update thread ID for recursive method calls
- powerpc: Fix bad inline asm constraint in create_zero_mask()
- libahci: save port map for forced port map
- ata: ahci-platform: Add ports-implemented DT bindings.
- USB: serial: cp210x: add ID for Link ECU
- USB: serial: cp210x: add Straizona Focusers device ids
- nvmem: mxs-ocotp: fix buffer overflow in read
- gpu: ipu-v3: Fix imx-ipuv3-crtc module autoloading
- drm/amdgpu: make sure vertical front porch is at least 1
- drm/amdgpu: set metadata pointer to NULL after freeing.
- iio: ak8975: Fix NULL pointer exception on early interrupt
- iio: ak8975: fix maybe-uninitialized warning
- drm/radeon: make sure vertical front porch is at least 1
- drm/i915/ddi: Fix eDP VDD handling during booting and suspend/resume
- drm/i915: Fix eDP low vswing for Broadwell
- drm/i915: Make RPS EI/thresholds multiple of 25 on SNB-BDW
- drm/i915: Fake HDMI live status
- lib/test-string_helpers.c: fix and improve string_get_size() tests
- drm/i915/skl: Fix DMC load on Skylake J0 and K0
- Linux 4.4.10

  * HDMI audio playback noise  observed on AMD Polaris 10/11 GPU (LP: #1577288)
- ALSA: hda: add AMD Polaris-10/11 AZ PCI IDs with proper driver caps

  * [i915_bpo] Update i915 backport driver (LP: #1580114)
- SAUCE: i915_bpo: Drop is_preliminary from BXT/KBL.
- SAUCE: i915_bpo: Sync with v4.6-rc7

  * CVE-2016-4486 (LP: #1578497)
- net: fix infoleak in rtnetlink

  * CVE-2016-4485 (LP: #1578496)
- net: fix infoleak in llc

  * drm.ko < kernel version 4.5 has a dead lock bug (LP: #1579610)
   

[Bug 1248289] Re: Missing libunwind support in perf

[Kamal Mostafa]

** Changed in: linux (Ubuntu Xenial)
   Status: Triaged => Fix Committed

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[Bug 1248289] Re: Missing libunwind support in perf

[Andy Whitcroft]

I have spun a new patch for the additional Build-Depends: and will
submit it once testing is complete.

>From an SRU testing standpoint the application of this patch is benign
so if we do not have a respin (when we should consider including this
additional patch) we can consider this "verification-done" for the
purposes of letting this bit of the fix out.  We can then reopen the bug
for the next piece.

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  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[Andy Whitcroft]

For clarity the patch applied to Xenial was the moral equivalent to that
in comment#17.  This does enable libunwind in the perf build, but we
also need the libbfd support for it to be useful.

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  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[Julian Taylor]

if you check the buildlog you see its not fixed, its still missing
libbfd-dev, have you applied the posted patch?

** Changed in: linux (Ubuntu Xenial)
   Status: Fix Committed => Triaged

** Changed in: linux (Ubuntu Yakkety)
   Status: Fix Committed => Triaged

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[Bug 1248289] Re: Missing libunwind support in perf

[Kamal Mostafa]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-xenial

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[Bug 1248289] Re: Missing libunwind support in perf

[Tim Gardner]

** Also affects: linux (Ubuntu Yakkety)
   Importance: Medium
 Assignee: Tim Gardner (timg-tpi)
   Status: Confirmed

** Changed in: linux (Ubuntu Yakkety)
   Status: Confirmed => Fix Committed

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[Bug 1248289] Re: Missing libunwind support in perf

[Kamal Mostafa]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
   Status: New

** Changed in: linux (Ubuntu Xenial)
   Status: New => Fix Committed

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[Bug 1248289] Re: Missing libunwind support in perf

[Dmitry Rekman]

Does this problem not affect Canonical developers working on, say, Mir
(which is written in C++)?  It is way more painful to profile
applications on stock Ubuntu.

This can mean that Mir developers are not interested in performance of
their server, which I hope is a wrong conclusion to draw.

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  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[Benjamin.M]

This problem affects me too (on Xenial):

> uname -a
Linux Nyx 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 
x86_64 x86_64 GNU/Linux

> perf --version 
perf version 4.4.6

Adding --call-graph dwarf doesn't change that the symbols aren't
demangled.

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[Bug 1248289] Re: Missing libunwind support in perf

[Jerry Quinn]

Bug 1396654 c++ demangle support missing reported as a duplicate of this
one.

Is anyone working on it?  I'm having difficulty profiling c++ on ubuntu.

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[Bug 1248289] Re: Missing libunwind support in perf

[Julian Taylor]

with current linux git master you also need this so libunwind is
detected on trusty (probably due to the --as-needed linker setting):

--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -29,7 +29,7 @@ ifeq ($(ARCH),x86)
   ifeq (${IS_64_BIT}, 1)
 CFLAGS += -DHAVE_ARCH_X86_64_SUPPORT
 ARCH_INCLUDE = ../../arch/x86/lib/memcpy_64.S 
../../arch/x86/lib/memset_64.S
-LIBUNWIND_LIBS = -lunwind -lunwind-x86_64
+LIBUNWIND_LIBS = -lunwind -lunwind-x86_64 -llzma
 $(call detected,CONFIG_X86_64)
   else
 LIBUNWIND_LIBS = -lunwind-x86 -llzma -lunwind

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[Bug 1248289] Re: Missing libunwind support in perf

[Tim Gardner]

Alex  - please send patches to kernel-t...@lists.ubuntu.com. I'm pretty
sure nobody is looking at this particular problem right now.

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[Bug 1248289] Re: Missing libunwind support in perf

[Alex Cornejo]

This seems like a packaging problem, since in the debian world (not
ubuntu) perf happily supports dwarf symbols.

What is the current status? I would be happy to contribute a patch to
fix it, but don't want to redo anyone's work.

Also, is there a reason that the fix could not get backported to older
distros? It doesn't require changing the kernel, just the user space
perf binaries with an update.

Anyone that doesn't have perf tools installed won't notice the change.
And everyone that has perf tools installed (and therefore uses it) will
be very happy; I honestly can't see a reason NOT to do it. perf tools is
an essential component for performance tuning server applications.

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[Bug 1248289] Re: Missing libunwind support in perf

[Julian Taylor]

just tested the 4.2 kernel, the issue has not been fixed
it can also be seen in the buildlogs

 52311 config/Makefile:527: No bfd.h/libbfd found, please install 
binutils-dev[el]/zlib-static/libiberty-dev to gain sym   bol demangling
 52312 config/Makefile:556: No liblzma found, disables xz kernel module 
decompression, please install xz-devel/liblzma-d   ev


** Changed in: linux (Ubuntu)
   Status: Fix Released => Confirmed

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[Bug 1248289] Re: Missing libunwind support in perf

[Tim Gardner]

The Wily kernel will be released as an LTS HWE kernel in 14.04.4

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[Bug 1248289] Re: Missing libunwind support in perf

[Julian Taylor]

can the fix be applied at least to 14.04 lts kernels as well?
It should just be adding a build depends as I can build a correct perf just 
fine on a stock 14.04 with the right dependencies (libbfd-dev I think is the 
missing one)

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[Bug 1248289] Re: Missing libunwind support in perf

[Tim Gardner]

** Changed in: linux (Ubuntu)
 Assignee: Tim Gardner (timg-tpi) => (unassigned)

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[Bug 1248289] Re: Missing libunwind support in perf

[Tim Gardner]

This appears to be fixed in Wily linux 4.2-7.7

** Changed in: linux (Ubuntu)
   Status: In Progress => Fix Released

** Changed in: linux (Ubuntu)
 Assignee: (unassigned) => Tim Gardner (timg-tpi)

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Title:
  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[mbel]

looks like this issue is rather tricky. adding libunwind to build
dependecies actually gives nothing, there is still no dwarf support.
Digging deeper I found that following test, which detects libunwind
support for perf is not passed:

gcc -o test-libunwind test-libunwind.c -lunwind -lunwind-x86 -lelf fails with 
/usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/libunwind-x86.so: 
undefined reference to `lzma_stream_buffer_decode'
/usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/libunwind-x86.so: 
undefined reference to `lzma_index_uncompressed_size'
/usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/libunwind-x86.so: 
undefined reference to `lzma_index_end'
/usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/libunwind-x86.so: 
undefined reference to `lzma_index_buffer_decode'
/usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/libunwind-x86.so: 
undefined reference to `lzma_stream_footer_decode'
/usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/libunwind-x86.so: 
undefined reference to `lzma_index_size'
collect2: error: ld returned 1 exit status

adding -llzma to the test above doesn't solve the problem. During
further investigation I found that there are problem with libunwind8-dev
- its libraries lacks dependant libs. I filed bug on libunwind and
proposed solution for x86 platform. Link to the bug is
https://bugs.launchpad.net/ubuntu/+source/libunwind/+bug/1336912

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Title:
  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[tacy]

Hi Julian

Below is my test.

tacy@tacy:~$ sudo perf record --call-graph dwarf -a
callchain: Unknown --call-graph option value: dwarf

 usage: perf record [options] [command]
or: perf record [options] -- command [options]

--call-graph mode[,dump_size]
  setup and enables call-graph (stack chain/backtrace) 
recording: fp
tacy@tacy:~$ uname -a
Linux tacy 3.13.0-27-generic #50~precise1-Ubuntu SMP Fri May 16 20:47:56 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux

tacy@tacy:~$ cd -
/home/tacy/linux-lts-trusty-3.13.0/tools/perf
tacy@tacy:~/linux-lts-trusty-3.13.0/tools/perf$ sudo ./perf record --call-graph 
dwarf -a
^C[ perf record: Woken up 63 times to write data ]
[ perf record: Captured and wrote 17.352 MB perf.data (~758127 samples) ]

tacy@tacy:~/linux-lts-trusty-3.13.0/tools/perf$ ./perf --version
perf version 3.13.11
tacy@tacy:~/linux-lts-trusty-3.13.0/tools/perf$ perf --version
perf version 3.13.11

Yes,  After manually compiling can support, but default perf don't
support.

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  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[tacy]

Presics + trusty lts kernel (3.13.0-27)

~$ sudo perf record -g dwarf -a
dwarf: No such file or directory

strace output:

11268 10647 execve(/usr/local/sbin/dwarf, [dwarf, -a], [/* 28 vars */]) = 
-1 ENOENT (No such file or directory)
11269 10647 execve(/usr/local/bin/dwarf, [dwarf, -a], [/* 28 vars */]) = 
-1 ENOENT (No such file or directory)
11270 10647 execve(/usr/sbin/dwarf, [dwarf, -a], [/* 28 vars */]) = -1 
ENOENT (No such file or directory)
11271 10647 execve(/usr/bin/dwarf, [dwarf, -a], [/* 28 vars */]) = -1 
ENOENT (No such file or directory)
11272 10647 execve(/sbin/dwarf, [dwarf, -a], [/* 28 vars */]) = -1 ENOENT 
(No such file or directory)
11273 10647 execve(/bin/dwarf, [dwarf, -a], [/* 28 vars */]) = -1 ENOENT 
(No such file or directory)
11274 10647 dup(2)= 4

can't find dwarf ?

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  Missing libunwind support in perf

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Re: [Bug 1248289] Re: Missing libunwind support in perf

[Julian Taylor]

in trusty the command line is: perf record --call-graph dwarf
compared to saucy dwarf support seems to work fine in trusty so this
issue can be closed.

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  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[Mark Nelson]

Hi Tim,

Sorry to respond so late to this, hadn't seen your question earlier and
have been bogged down with holidays.  I've not seen -g dwarf work yet in
a stock ubuntu kernel, but have seen it work in custom kernel compiles.
Unfortunately I don't have any raring machines handy at the moment to
verify jtaylor's observation that it worked in the stock distribution
there.

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  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[Tim Gardner]

Mark - as far as I can tell, libunwind _is_ used during the compilation
of perf. I assume what you are doing worked prior to Saucy ?

** Changed in: linux (Ubuntu)
   Status: Triaged = In Progress

** Changed in: linux (Ubuntu)
 Assignee: (unassigned) = Tim Gardner (timg-tpi)

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  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[Julian Taylor]

yes in raring perf -g dwarf worked. It stopped working for me in saucy.

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Title:
  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[Brad Figg]

** Changed in: linux (Ubuntu)
   Status: New = Triaged

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  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[Julian Taylor]

oh '-g fp' is without unwind support
right having dwarf back would be nice.

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  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[Julian Taylor]

kernel 3.11 is a saucy kernel not raring
are you on saucy or using a backported kernel?

on saucy perf its '-g fp' instead of '-g dwarf'

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  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[Mark Nelson]

jtaylor:

Yep, this is saucy.  Just upgraded  in fact for the newer stock kernel
and hoping that dwarf support would be there. :)

I work on Ceph at Inktank and there are times when we are debugging
customer clusters with stock kernels where having unwind support in perf
would be very useful.  It would be especially nice if we could get it
working before 14.04 lands as I expect a lot of people will be
standardizing on that in the future.

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  Missing libunwind support in perf

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[Bug 1248289] Re: Missing libunwind support in perf

[Joseph Salisbury]

** Changed in: linux (Ubuntu)
   Importance: Undecided = Medium

** Tags added: saucy trusty

** Tags added: kernel-da-key

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  Missing libunwind support in perf

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