From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============6999529833418294417==" MIME-Version: 1.0 From: Boris Brezillon To: lkp@lists.01.org Subject: Re: [nand] BUG: unable to handle kernel NULL pointer dereference at 000005f4 Date: Mon, 14 Dec 2015 14:36:13 +0100 Message-ID: <20151214143613.68b08833@bbrezillon> In-Reply-To: <20151214131247.GA32694@wfg-t540p.sh.intel.com> List-Id: --===============6999529833418294417== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable On Mon, 14 Dec 2015 21:12:47 +0800 Fengguang Wu wrote: > On Mon, Dec 14, 2015 at 02:04:33PM +0100, Boris Brezillon wrote: > > On Mon, 14 Dec 2015 13:58:09 +0100 > > Boris Brezillon wrote: > > = > > > On Mon, 14 Dec 2015 20:47:19 +0800 > > > Fengguang Wu wrote: > > > = > > > > On Mon, Dec 14, 2015 at 11:42:44AM +0100, Boris Brezillon wrote: > > > > > Hi Fengguang, > > > > > = > > > > > On Mon, 14 Dec 2015 14:45:37 +0800 > > > > > Fengguang Wu wrote: > > > > > = > > > > > > Hi Boris, > > > > > > = > > > > > > On Sun, Dec 13, 2015 at 09:50:43PM +0100, Boris Brezillon wrote: > > > > > > > Hi Fengguang, > > > > > > > = > > > > > > > On Sun, 13 Dec 2015 09:49:17 +0800 > > > > > > > Fengguang Wu wrote: > > > > > > > = > > > > > > > > Hi Boris, > > > > > > > > = > > > > > > > > FYI, this happened when merging your branch, which indicate= s possible > > > > > > > > conflicts with other developer's patches or the new RC rele= ase. > > > > > > > = > > > > > > > Is this boot test also run on my bbrezillon-0day/nand/layerin= g-rework > > > > > > > branch (before merging it into devel-spot), and if it is, do = you see the > > > > > > > same error? > > > > > > = > > > > > > The bisect tests bbrezillon-0day/nand/layering-rework, however = it's > > > > > > fine there. > > > > > > = > > > > > > > Is the devel-spot-201512102358 tag publicly accessible? If it= 's not, > > > > > > = > > > > > > Nope. > > > > > > = > > > > > > > could you push it somewhere (or give me a way to generate it = by > > > > > > > pulling the relevant branches), so that I can investigate on = this bug? = > > > > > > = > > > > > > Or it may be more convenient to check linux-next first? > > > > > > = > > > > > > FYI, the merged branches in devel-spot-201512102358 are: > > > > > > = > > > > > > af8fc33 Merge 'bbrezillon-0day/nand/layering-rework' into devel= -spot-201512102358 > > > > > > acfc1de Merge 'linux-review/Maury-Markowitz/renaming-NTSC-file-= because-it-doesnt-actually-use-8VSV-updating-channel-listings-add-channel-n= umbers/20151210-210449' into devel-spot-201512102358 > > > > > > fb9daac Merge 'fdmanana/integration-4.4' into devel-spot-201512= 102358 > > > > > > 1b30725 Merge 'fdmanana/for-chris-4.4' into devel-spot-20151210= 2358 > > > > > > 83f2246 Merge 'arm-integrator/realview-defconfig' into devel-sp= ot-201512102358 > > > > > > 03df745 Merge 'arm-integrator/realview-multiplatform-base' into= devel-spot-201512102358 > > > > > > d2aea29 Merge 'linux-review/Arnd-Bergmann/i2c-allow-building-em= ev2-without-slave-mode-again/20151210-211642' into devel-spot-201512102358 > > > > > > e2f041d Merge 'arm-integrator/realview-base-armsoc' into devel-= spot-201512102358 > > > > > > 5c46550 Merge 'linux-review/Bert-Kenward/sfc-only-use-RSS-filte= rs-if-we-re-using-RSS/20151210-213247' into devel-spot-201512102358 > > > > > > d07f80f Merge 'sound/test/hdmi-jack' into devel-spot-2015121023= 58 > > > > > > 540f8b7 Merge 'sound/topic/hdmi-jack' into devel-spot-201512102= 358 > > > > > > 9111fa0 Merge 'linux-review/matrandg-cisco-com/tc358743-Use-loc= al-array-with-fixed-size-in-i2c-write/20151210-214154' into devel-spot-2015= 12102358 > > > > > > 3d81ef9 Merge 'linux-review/matrandg-cisco-com/tc358743-Print-t= imings-only-when-debug-level-is-set/20151210-220321' into devel-spot-201512= 102358 > > > > > > 122e43c Merge 'bbrezillon-0day/nand/ecclayout-squashed' into de= vel-spot-201512102358 > > > > > > e0572f8 Merge 'wireless-drivers-next/pending' into devel-spot-2= 01512102358 > > > > > > dc5d9c9 Merge 'linux-review/Geliang-Tang/list-introduce-list_is= _first/20151210-222552' into devel-spot-201512102358 > > > > > > 289e2a8 Merge 'linux-review/Arnd-Bergmann/staging-davinci_vfpe-= allow-modular-build/20151210-223348' into devel-spot-201512102358 > > > > > > d74c50d Merge 'linux-review/Damien-Horsley/Add-driver-for-Pista= chio-internal-DAC/20151210-224304' into devel-spot-201512102358 > > > > > > ee3c58b Merge 'cryptodev/master' into devel-spot-201512102358 > > > > > > d390f7d Merge 'linux-review/John-Garry/hisi_sas-use-platform_ge= t_irq/20151210-224851' into devel-spot-201512102358 > > > > > > de31f5d Merge 'linux-review/Mike-Marciniszyn/staging-rdma-hfi1-= add-definitions-for-OPA-traps/20151210-230158' into devel-spot-201512102358 > > > > > > 5618568 Merge 'linux-review/Andrei-Emeltchenko/Bluetooth-h5-Do-= not-initialize-Configuration-field/20151210-230440' into devel-spot-2015121= 02358 > > > > > > 759aa32 Merge 'linux-review/Moritz-K-nig/staging-COMEDI-checkpa= tch-pl-cleanups-in-comedi-h/20151210-230707' into devel-spot-201512102358 > > > > > > 2edcbb4 Merge 'linux-review/Andy-Shevchenko/net-hns-annotate-IO= -address-space-properly/20151210-232510' into devel-spot-201512102358 > > > > > > 0f51fdd Merge 'integrity/next-kexec' into devel-spot-2015121023= 58 > > > > > > b32bcbc Merge 'dm/dm-4.5' into devel-spot-201512102358 > > > > > > ea297f5 Merge 'linux-review/Mathieu-Desnoyers/thread_local_abi-= system-call-caching-current-CPU-number-x86/20151210-234242' into devel-spot= -201512102358 > > > > > > 52bc163 Merge 'linux-review/yegorslists-googlemail-com/USB-seri= al-option-add-support-for-Quectel-UC20/20151210-234659' into devel-spot-201= 512102358 > > > > > > 797cc7c Merge 'linux-review/Andy-Shevchenko/staging-rtl8188eu-p= rovide-an-absolute-path-to-include-folder/20151210-234752' into devel-spot-= 201512102358 > > > > > > 23d8b49 Merge 'omap-dss2/for-next' into devel-spot-201512102358 > > > > > > 88a768f 0day base guard for 'devel-spot-201512102358' > > > > > > 527e931 Linux 4.4-rc4 > > > > > > = > > > > > > > > = > > > > > > > > linux-next/master also has the problem. > > > > > > > = > > > > > > > Okay. You mean linux-next/master alone, or after merging my b= ranch into > > > > > > > linux-next/master? > > > > > > = > > > > > > It's stand alone linux-next/master as indicated by the bisect l= og. > > > > > > Does it include any of your patches? > > > > > = > > > > > I tried to boot the next-20151214 build, before [1] and after [2] > > > > > merging my nand/layering-rework branch merged into it, and both a= re > > > > > booting fine. > > > > = > > > > Are you using the emailed kconfig? I'd not recommend try the below > > > > step if cannot even reproduce the issue in linux-next. > > > = > > > Yes, I did use the config you attached in your email + the script your > > > pasted to boot the kernel with qemu, and linux-next/master boots > > > correctly. > > > As answered in the other email I just sent, I managed to reproduce the > > > bug you're pointing after merging both > > > bbrezillon-0day/nand/ecclayout-squashed and > > > bbrezillon-0day/nand/layering-rework into linus' 4.4-rc4. > > > = > > > = > > = > > FYI, below is the patch I used to fix the bug, but I'd be interested in > > reproducing the problem you've seen on linux-next/master. Did you, by > > any chance, keep the branch/tag you used to trigger this bug on > > linux-next? > = > Yes. Bisect log shows that these 2 commits both have the bug: > = > # extra tests on tree/branch linus/master > git bisect bad a80c47daa818ead2644917d72ff2a934dd64fd16 # 03:36 0-= 1 Merge tag 'sound-4.4-rc5' of git://git.kernel.org/pub/scm/linux/ke= rnel/git/tiwai/sound I just tested this commit, and it works fine on my side... Could you test it again? > # extra tests on tree/branch linux-next/master > git bisect bad 8225f4e85cb03daea14661380745886ce01fd83a # 03:42 0-= 3 Add linux-next specific files for 20151210 Hm, unfortunately I can't checkout this commit (it comes from linux-next and it's been rebased/regenerated since then). -- = Boris Brezillon, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com --===============6999529833418294417==--