linux-kernel - Re: PROBLEM: 3.0-rc kernels unbootable since -rc3

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Date:	Thu, 7 Jul 2011 12:31:15 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	julie Sullivan <kernelmail.jms@...il.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, patches@...aro.org,
	torvalds@...ux-foundation.org
Subject: Re: PROBLEM: 3.0-rc kernels unbootable since -rc3

On Wed, Jul 06, 2011 at 02:23:48PM -0700, Paul E. McKenney wrote:
> On Wed, Jul 06, 2011 at 10:10:16PM +0100, julie Sullivan wrote:
> > None of my kernels after 3.0-rc3 will boot on my Dell XPS-M1730
> > (x86-64 2-core) test box running
> > Ubuntu (Kubuntu) 11.04 (i.e. the first unbootable one was -rc4).
> > The machine freezes immediately after selecting the kernel from the
> > bootloader menu, leaving
> > me with a blank blue screen so I can't give you any log messages.
> > 
> > It bisects to the following commit:
> > 
> > commit a46e0899eec7a3069bcadd45dfba7bf67c6ed016
> > Author: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > Date:   Wed Jun 15 15:47:09 2011 -0700
> > 
> >     rcu: use softirq instead of kthreads except when RCU_BOOST=y
> > 
> >     This patch #ifdefs RCU kthreads out of the kernel unless RCU_BOOST=y,
> >     thus eliminating context-switch overhead if RCU priority boosting has
> >     not been configured.
> > 
> >     Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > 
> > I've tried cherry-picking onto good/reverting from bad but I don't
> > know what to do with the merge
> > conflicts, somebody who knows the code/design needs to look really.
> > There are more changes than a
> > couple of simple #ifdefs.
> 
> Hello, Julie,
> 
> One approach would be to cherry-pick the following commits:
> 
> f8b7fc6b514f34a51875dd48dff70d4d17a54f38 rcu: Move RCU_BOOST #ifdefs to header f
> a46e0899eec7a3069bcadd45dfba7bf67c6ed016 rcu: use softirq instead of kthreads ex
> 09223371deac67d08ca0b70bd18787920284c967 rcu: Use softirq to address performance
> 9a432736904d386cda28b987b38ba14dae960ecc rcu: Simplify curing of load woes
> 
> Another approach would be to move ahead to v3.0-rc4 or later.

Ah, OK, I see that you are having this problem with the later -rc
releases as well.  I have looked at the commit you bisected to, and
don't yet see how it is causing the problem, but will continue looking.

And I have to ask...  Any chance of a serial console or something similar
on your system?  It would be very good to see any early printf()s.

							Thanx, Paul

> > Let me know if you need any further info.
> > 
> > The config of the bad kernel will follow in next email, while you're
> > waiting here's some nice
> > environment info from a good kernel bisected nearest to the offending
> > commit for you to enjoy
> > looking at :-)
> > 
> > ----------
> > ver_linux:
> > Linux julie-MXG071 3.0.0-rc2-bisect-8+ #11 SMP Tue Jul 5 20:50:02 BST
> > 2011 x86_64 x86_64 x86_64 GNU/Linux
> > 
> > Gnu C                  4.5.2
> > Gnu make               3.81
> > binutils               2.21.0.20110327
> > util-linux             2.17.2
> > mount                  support
> > module-init-tools      3.12
> > e2fsprogs              1.41.14
> > pcmciautils            015
> > Linux C Library        2.13
> > Dynamic linker (ldd)   2.13
> > Procps                 3.2.8
> > Net-tools              1.60
> > Kbd                    1.15
> > Sh-utils               8.5
> > wireless-tools         30
> > Modules Loaded         nouveau uvcvideo r852 sm_common videodev
> > iwl4965 nand nand_ids dell_wmi sdhci_pci sdhci nand_ecc firewire_ohci
> > mtd dell_laptop v4l2_compat_ioctl32 mmc_core firewire_core ttm
> > iwl_legacy drm_kms_helper mxm_wmi intel_agp intel_gtt
> > 
> > ------------------
> > cat /proc/cpuinfo:
> > processor       : 0
> > vendor_id       : GenuineIntel
> > cpu family      : 6
> > model           : 23
> > model name      : Intel(R) Core(TM)2 Duo CPU     T8300  @ 2.40GHz
> > stepping        : 6
> > cpu MHz         : 2401.000
> > cache size      : 3072 KB
> > physical id     : 0
> > siblings        : 2
> > core id         : 0
> > cpu cores       : 2
> > apicid          : 0
> > initial apicid  : 0
> > fpu             : yes
> > fpu_exception   : yes
> > cpuid level     : 10
> > wp              : yes
> > flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
> > syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl
> > aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm
> > sse4_1 lahf_lm ida dts tpr_shadow vnmi flexpriority
> > bogomips        : 4787.29
> > clflush size    : 64
> > cache_alignment : 64
> > address sizes   : 36 bits physical, 48 bits virtual
> > power management:
> > 
> > processor       : 1
> > vendor_id       : GenuineIntel
> > cpu family      : 6
> > model           : 23
> > model name      : Intel(R) Core(TM)2 Duo CPU     T8300  @ 2.40GHz
> > stepping        : 6
> > cpu MHz         : 800.000
> > cache size      : 3072 KB
> > physical id     : 0
> > siblings        : 2
> > core id         : 1
> > cpu cores       : 2
> > apicid          : 1
> > initial apicid  : 1
> > fpu             : yes
> > fpu_exception   : yes
> > cpuid level     : 10
> > wp              : yes
> > flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
> > syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl
> > aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm
> > sse4_1 lahf_lm ida dts tpr_shadow vnmi flexpriority
> > bogomips        : 4787.46
> > clflush size    : 64
> > cache_alignment : 64
> > address sizes   : 36 bits physical, 48 bits virtual
> > power management:
> > 
> > ------------------
> > cat /proc/modules:
> > nouveau 555654 2 - Live 0xffffffffa0124000
> > uvcvideo 56906 0 - Live 0xffffffffa0115000
> > r852 10128 0 - Live 0xffffffffa0058000
> > sm_common 7684 1 r852, Live 0xffffffffa002e000
> > videodev 73451 1 uvcvideo, Live 0xffffffffa0102000
> > iwl4965 155443 0 - Live 0xffffffffa00db000
> > nand 41249 2 r852,sm_common, Live 0xffffffffa006d000
> > nand_ids 5858 1 nand, Live 0xffffffffa0017000
> > dell_wmi 1625 0 - Live 0xffffffffa0010000
> > sdhci_pci 8832 0 - Live 0xffffffffa002a000
> > sdhci 22896 1 sdhci_pci, Live 0xffffffffa0023000
> > nand_ecc 3888 1 nand, Live 0xffffffffa0009000
> > firewire_ohci 26259 0 - Live 0xffffffffa00d3000
> > mtd 28256 2 sm_common,nand, Live 0xffffffffa00c7000
> > dell_laptop 8899 0 - Live 0xffffffffa00c0000
> > v4l2_compat_ioctl32 7213 1 videodev, Live 0xffffffffa00bb000
> > mmc_core 76861 1 sdhci, Live 0xffffffffa009f000
> > firewire_core 51699 1 firewire_ohci, Live 0xffffffffa008b000
> > ttm 58297 1 nouveau, Live 0xffffffffa005d000
> > iwl_legacy 122602 1 iwl4965, Live 0xffffffffa0033000
> > drm_kms_helper 26926 1 nouveau, Live 0xffffffffa001b000
> > mxm_wmi 1695 1 nouveau, Live 0xffffffffa0013000
> > intel_agp 11475 0 - Live 0xffffffffa000c000
> > intel_gtt 14036 1 intel_agp, Live 0xffffffffa0004000
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