Message-ID: <1477154414.6423.34.camel@linux.intel.com>
Date:   Sat, 22 Oct 2016 19:40:14 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     kernel test robot <fengguang.wu@...el.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     LKP <lkp@...org>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        wfg@...ux.intel.com
Subject: Re: [serial: 8250_lpss] a13e19cf3d: BUG: kernel hang in boot stage

On Mon, 2016-09-05 at 18:15 +0300, Andy Shevchenko wrote:
> +Heikki
> 
> On Sat, 2016-09-03 at 16:25 +0800, kernel test robot wrote:
> > Greetings,
> > 
> > 0day kernel testing robot got the below dmesg and the first bad
> > commit
> > is
> 
> Briefly tested I have hang issues *with* or *without* the mentioned
> commit if under hang you meant no getty available on serial console.
> Otherwise I see output from kernel till 
> 
> [   61.625900] raid6test: complete (2429 tests, 0 failures)
> [   61.671165] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
> [   61.678004] EDD information not available.
> [   61.714036] ALSA device list:
> [   61.717459]   #0: Dummy 1
> [   61.720480]   #1: MTPAV on parallel port at 0x378
> 
> Attached defconfigs per commit I have tested (also diff between mine
> and
> yours when I did make savedefconfig).
> 
> So, may I ask what exact hardware you are using to test this one?

May I ask beloved LKP team what the status of the issue is? Shall we
close it or there is more information coming?

> 
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-
> > next
> > 
> > commit a13e19cf3dc1080cf8a3a174cefd9199610faed7
> > Author:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > AuthorDate: Wed Aug 17 19:20:27 2016 +0300
> > Commit:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > CommitDate: Wed Aug 31 16:13:30 2016 +0200
> > 
> >     serial: 8250_lpss: split LPSS driver to separate module
> >     
> >     The SoCs, such as Intel Braswell, have DesignWare UART IP. Split
> > out the
> >     support of such chips to a separate module which also will be
> > used
> > for Intel
> >     Quark later.
> >     
> >     The rationale to have the separate driver to be existing:
> >     - Do not contaminate 8250_pci.c anymore with LPSS related quirks
> >     - All of them are using same DMA engine and they are Designware
> > IP
> > which means
> >       that in the future we might share the code between 8250_dw.c
> > and
> > 8250_lpss.c
> >     - It reduces the kernel memory footprint on non-X86 machines
> > where
> > 8250_pci.c
> >       is in use
> >     
> >     Besides the split the driver also has been refactored, in
> > particular a) the DMA
> >     and port setup are separate functions, b) the two new structures
> > lpss8250 and
> >     lpss8250_board are introduced to keep necessary data instead of
> >     pciserial_board, c) DMA parameters are passed to the DMA setup
> > via
> > mentioned
> >     custom structure. Most of the changes are done due to the future
> > support of
> >     UART DMA on Intel Quark.
> >     
> >     The Intel Quark UART DMA support is based on bits taking from
> > BSP
> > code
> >     published by Intel earlier.
> >     
> >     The driver does not use any specific power management. PCI core
> > takes care of
> >     the default behaviour during suspend and resume.
> >     
> >     Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.co
> > m>
> >     Tested-by: Bryan O'Donoghue <pure.logic@...us-software.ie>
> >     Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > 
> > +-------------------------------+------------+------------+---------
> > --
> > -+
> > > 
> > >                               | 68af490b03 | a13e19cf3d |
> > > 6fe4da5401
> > > > 
> > 
> > +-------------------------------+------------+------------+---------
> > --
> > -+
> > > 
> > > boot_successes                | 63         | 0          |
> > > 0          |
> > > boot_failures                 | 0          | 26         |
> > > 27         |
> > > BUG:kernel_hang_in_boot_stage | 0          | 26         |
> > > 27         |
> > 
> > +-------------------------------+------------+------------+---------
> > --
> > -+
> > 
> > Booting the kernel.
> > 
> > Elapsed time: 500
> > BUG: kernel hang in boot stage
> > Linux version 4.8.0-rc2-00028-ga13e19c #1
> > Command line:  root=/dev/ram0 hung_task_panic=1 debug apic=debug
> > sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100
> > net.ifnames=0
> > printk.devkmsg=on panic=-1 softlockup_panic=1 nmi_watchdog=panic
> > oops=panic load_ramdisk=2 prompt_ramdisk=0 systemd.log_level=err
> > ignore_loglevel earlyprintk=ttyS0,115200 console=ttyS0,115200
> > console=tty0 vga=normal rw link=/kbuild-tests/run-queue/kvm/x86_64-
> > randconfig-r0-09031101/linux-devel:devel-spot-
> > 201609030826:a13e19cf3dc1080cf8a3a174cefd9199610faed7:bisect-linux-
> > 0/.vmlinuz-a13e19cf3dc1080cf8a3a174cefd9199610faed7-20160903152912-
> > 8-
> > vp branch=linux-devel/devel-spot-201609030826
> > BOOT_IMAGE=/pkg/linux/x86_64-randconfig-r0-09031101/gcc-
> > 6/a13e19cf3dc1080cf8a3a174cefd9199610faed7/vmlinuz-4.8.0-rc2-00028-
> > ga13e19c drbd.minor_count=8
> > 
> > 
> > git bisect start 6fe4da54019254083959652e61fab5d7b6d8b16b
> > 3eab887a55424fc2c27553b7bfe32330df83f7b8 --
> > git bisect good 86374892625f368ff0a7d0045bbd10f5005f5095  #
> > 13:00     20+      0  Merge 'linux-review/Paul-Burton/Partial-MIPS-
> > Malta-DT-conversion/20160903-000153' into devel-spot-201609030826
> > git bisect  bad 28b0a3136795a9a1d1abb0331790bbae75e71e03  #
> > 13:14      0-     11  Merge 'renesas/topic/sdr104-v6' into devel-
> > spot-
> > 201609030826
> > git bisect good 2e5ad9bf16a597bcf52ffee14dc5a3dc80e60ae9  #
> > 13:24     22+      0  Merge 'linux-review/Wang-Nan/perf-report-
> > Recognize-hugetlb-mapping-as-anon-mapping/20160902-220432' into
> > devel-
> > spot-201609030826
> > git bisect  bad bedfbf8942db947f2a9be3e3a4e01d8ddf3bdf4e  #
> > 13:40      0-      8  Merge 'linux-review/Luca-Ceresoli/rtl8723au-
> > remove-declaration-of-unimplemented-functions/20160902-211231' into
> > devel-spot-201609030826
> > git bisect  bad 687a5fb1c4382d1e37d444fdc24f9a0ecb4034a0  #
> > 14:02      0-     10  Merge 'tty/tty-testing' into devel-spot-
> > 201609030826
> > git bisect good 259bbca0cd7b626ab0fc5eb63dfc24b1408e29b4  #
> > 14:13     21+      0  Merge 'linux-review/Toke-H-iland-J-
> > rgensen/mac80211-Move-reorder-sensitive-TX-handlers-to-after-TXQ-
> > dequeue/20160902-215155' into devel-spot-201609030826
> > git bisect good bf7a791d2c931375ae966adfb0a93eae426c6d7e  #
> > 14:26     22+      0  Merge 'linux-review/Hariprasad-Shenai/cxgb4-
> > Add-
> > support-for-ndo_get_vf_config/20160902-214923' into devel-spot-
> > 201609030826
> > git bisect good 5887ad43ee02a00f17a6132b7fb256dc6865474c  #
> > 14:41     22+      0  tty: serial: fsl_lpuart: Use cyclic DMA for Rx
> > git bisect good 9217a5bf66061c392e461255c5d9d41aac136e58  #
> > 14:50     22+      0  dmaengine: dw: keep copy of custom slave
> > config
> > in dwc
> > git bisect good 8d17047207d52182ccd55b9529e1c8cc062c07c2  #
> > 15:06     22+      0  serial: 8250_dma: switch to new
> > dmaengine_terminate_* API
> > git bisect good 68af490b03b40cc31b2cd47899661d87ab9f127d  #
> > 15:22     22+      0  serial: 8250: enable AFE on ports where FIFO
> > is
> > 16 bytes
> > git bisect  bad a13e19cf3dc1080cf8a3a174cefd9199610faed7  #
> > 15:36      0-      4  serial: 8250_lpss: split LPSS driver to
> > separate
> > module
> > # first bad commit: [a13e19cf3dc1080cf8a3a174cefd9199610faed7]
> > serial:
> > 8250_lpss: split LPSS driver to separate module
> > git bisect good 68af490b03b40cc31b2cd47899661d87ab9f127d  #
> > 15:40     63+      0  serial: 8250: enable AFE on ports where FIFO
> > is
> > 16 bytes
> > # extra tests on HEAD of linux-devel/devel-spot-201609030826
> > git bisect  bad 6fe4da54019254083959652e61fab5d7b6d8b16b  #
> > 15:40      0-     27  0day head guard for 'devel-spot-201609030826'
> > # extra tests on tree/branch tty/tty-next
> > git bisect  bad d2f5a7311bcaed681a41cb3419b8fe92a7b68bf5  #
> > 16:00      0-     17  dmaengine: hsu: refactor hsu_dma_do_irq() to
> > return int
> > # extra tests on tree/branch linus/master
> > git bisect good 0141af184adc7f6ea9bd2f9631a15704d0806f8b  #
> > 16:10     66+      1  Merge branch 'for-linus' of
> > git://git.kernel.dk/linux-block
> > # extra tests on tree/branch linux-next/master
> > git bisect good 0f98f121e1670eaa2a2fbb675e07d6ba7f0e146f  #
> > 16:24     65+      1  Add linux-next specific files for 20160825
> > 
> > 
> > ---
> > 0-DAY kernel test infrastructure                Open Source
> > Technology
> > Center
> > https://lists.01.org/pipermail/lkp                          Intel
> > Corporation
> 
> 

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy

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