On Fri, Jun 27, 2014 at 3:14 PM, Djalal Harouni <tix...@opendz.org> wrote:
> On Fri, Jun 27, 2014 at 02:28:56PM -0700, Greg KH wrote:
>> On Fri, Jun 27, 2014 at 10:19:03PM +0100, Djalal Harouni wrote:
>> > On Fri, Jun 27, 2014 at 12:23:05PM +0100, Djalal Harouni wrote:
>> > > On Fri, Jun 27, 2014 at 01:04:00PM +0200, Daniel Mack wrote:
>> > > > On 06/27/2014 12:51 PM, Djalal Harouni wrote:
>> > > > > Just to let you know that I did notice a regression by ~70% when
>> > > > > running
>> > > > > test-kdbus-benchmark on a kvm guest (that's what I've under hands
>> > > > > now)
>> > > > >
>> > > > > I know sorry, but still a kdbus on kvm is a valid case, I don't know
>> > > > > if
>> > > > > this affects real machine or only kvm guests will be able to confirm
>> > > > > it
>> > > > > next week unless someone do!
>> > > > >
>> > > > > If you are able to test it in a real machine and confirm that it
>> > > > > affects
>> > > > > them too, thank you!
>> > > > > I've managed to bisect this to:
>> > > > > 3.15.0-rc1 good
>> > > > > 3.15.0-rc5 bad
>> > > > >
>> > > > > I Will continue later this day!
>> > > >
>> > > > Please do. I'm not currently aware of such a regression. What about
>> > > > 3.16-rc2?
>> > A bit late, sorry!
>> >
>> > I was wrong on the 3.15.0-rc5 sorry that was a fedora rawhide kernel got
>> > confused by the naming and 'rc5'... but yes fedora rawhide affected! so
>> > something backported perhaps...
>> >
>> >
>> > Anyway for upstream tests:
>> >
>> > 3.15.0-rc5 and 3.15.0-rc7 are good
>> >
>> > 3.16-rc1 and 3.16-rc2 are bad
>> >
>> > So I confirm there is a regression somewhere.
>>
>> Can you run 'git bisect' on the kernel tree to try to track down the
>> problem commit?
> Yes of course! I'm planning to do so
>
> Thanks!
>
Was going to try to repro this perf regression as well, but instead got
kdbus to oops (via test-kdbus-benchmark):
$ test/test-kdbus-benchmark
-- opening /dev/kdbus/control
-- creating bus '1000-testbus'
-- opening bus connection /dev/kdbus/1000-testbus/bus
-- Our peer ID for /dev/kdbus/1000-testbus/bus: 1 -- bus uuid:
'b65bfdd23d3e4696aae2992a0857aa33'
-- opening bus connection /dev/kdbus/1000-testbus/bus
-- Our peer ID for /dev/kdbus/1000-testbus/bus: 2 -- bus uuid:
'b65bfdd23d3e4696aae2992a0857aa33'
name_acquire(): flags after call: 0x0
Killed
$
[ 32.853967] kdbus: initialized
[ 33.557785] BUG: unable to handle kernel NULL pointer dereference at
(null)
[ 33.557819] IP: [< (null)>] (null)
[ 33.557837] PGD c58a5067 PUD c81cd067 PMD 0
[ 33.557856] Oops: 0010 [#1] SMP
[ 33.557870] Modules linked in: kdbus(O) snd_hda_codec_hdmi tun hid_generic
snd_hda_codec_realtek snd_hda_codec_generic usbhid hid kvm_amd kvm
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw
gf128mul glue_helper ablk_helper cryptd snd_hda_intel snd_hda_controller radeon
microcode snd_hda_codec snd_hwdep broadcom snd_pcm snd_timer serio_raw tg3
fam15h_power snd ttm soundcore libphy edac_core i2c_piix4 edac_mce_amd k10temp
tpm_tis tpm acpi_cpufreq wmi evdev processor usbip_host(C) usbip_core(C) ext4
crc16 jbd2 mbcache sd_mod ata_generic pata_acpi crc_t10dif crct10dif_common
ahci pata_jmicron libahci pata_atiixp crc32c_intel ehci_pci ehci_hcd xhci_hcd
libata firewire_ohci usbcore scsi_mod usb_common firewire_core crc_itu_t i915
video intel_gtt i2c_algo_bit drm_kms_helper
[ 33.558231] drm i2c_core e1000e ptp pps_core ipmi_poweroff ipmi_msghandler
button
[ 33.558267] CPU: 1 PID: 1393 Comm: test-kdbus-benc Tainted: G C O
3.16.0-rc2-ec2-00222-g3493860 #1
[ 33.558335] task: ffff8803e7811d80 ti: ffff8800c82cc000 task.ti:
ffff8800c82cc000
[ 33.558364] RIP: 0010:[<0000000000000000>] [< (null)>]
(null)
[ 33.558398] RSP: 0018:ffff8800c82cfe40 EFLAGS: 00010246
[ 33.558419] RAX: ffffffff81636400 RBX: ffff880406dcfe40 RCX: 0000000000000000
[ 33.558447] RDX: 0000000000000001 RSI: ffff8800c82cfe88 RDI: ffff8800c82cfe98
[ 33.558475] RBP: ffff8800c82cfe78 R08: 00007fff80d23810 R09: ffff8803f9d5cc00
[ 33.558503] R10: ffff8803e7811d80 R11: 0000000000000246 R12: ffff8800c82cfe98
[ 33.558532] R13: ffff880406dcfe48 R14: ffff8800c82cfe88 R15: 0000000000000001
[ 33.558566] FS: 00007f97e69bf700(0000) GS:ffff88042dc40000(0000)
knlGS:0000000000000000
[ 33.558595] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 33.558616] CR2: 0000000000000000 CR3: 0000000036e20000 CR4: 00000000000407e0
[ 33.558642] Stack:
[ 33.558650] ffffffffa11f45d6 0000000000000000 ffff8800c82cff50
0000000000000010
[ 33.558681] 00007fff80d23800 ffff8800c82cff50 0000000000000000
ffff8800c82cfef8
[ 33.558712] ffffffff811d386a 00007fff80d23800 0000000000000010
ffff8803f9d5d400
[ 33.558743] Call Trace:
[ 33.558757] [<ffffffffa11f45d6>] ? kdbus_memfd_writev+0x66/0xa0 [kdbus]
[ 33.558785] [<ffffffff811d386a>] do_sync_write+0x5a/0x90
[ 33.558806] [<ffffffff811d4071>] vfs_write+0x151/0x200
[ 33.558827] [<ffffffff811d4bb6>] SyS_write+0x46/0xc0
[ 33.558847] [<ffffffff81105eb6>] ? __audit_syscall_exit+0x236/0x2e0
[ 33.558872] [<ffffffff8152faed>] system_call_fastpath+0x1a/0x1f
[ 33.558894] Code: Bad RIP value.
[ 33.558910] RIP [< (null)>] (null)
[ 33.558930] RSP <ffff8800c82cfe40>
[ 33.558943] CR2: 0000000000000000
[ 33.569387] ---[ end trace e8d6c50c5ef168aa ]---
Any ideas?
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