FYI a (rephrased ;-) note from Antti Palosaari on linux- me...@vger.kernel.org:
It might be that the patches above are not the correct solution. If I understood correctly, the root cause might be more complicated: Seems that si2157_sleep (containing the single original cancel_delayed_work_sync) was not called as it should have been. BR, Martin -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1532412 Title: kernel panic after "rmmod cx23885" by upstream commit 2f1ea29f / "[media] si2157: implement signal strength stats" Status in linux package in Ubuntu: Triaged Bug description: [Reported also on linux-me...@vger.kernel.org] * relevance / use-case: HTPC going into sleep (currently requires rmmod as isolated here) when not being used. * base system: - Ubuntu 15.10 (arch: amd64) - PCIe DVB-C card DVBSky T982 (2 DVB-C/T tuners) - starting point: Ubuntu kernel 4.2.x / x86_64 * reliably trigger kernel panic (analyzed with kdb / gdb): - run tvheadend 4.x using the DVB-C tuners (from git/master in my case, but actual release should not be that relevant) ... likely any other DVB-C application would be sufficient. - stop tvheadend - rmmod cx23885 Please note: It seems to be relevant that the DVB-C tuners were in use (and released) before the call to rmmod. During testing, I had situations where I could successfully do the rmmod if tvheadend was not yet started after a fresh boot. The kernel panic happens after the rmmod with a little delay (less than a second) - in some completely unrelated parts of the kernel, but reproducible locations, e.g. a stack frame like: call_timer_fn+0x35/0xf0 __run_timers (inlined) run_timer_softirq+0x221/0x2d0 __do_softirq+0x0f6/0250 (unable to handle paging request, aka invalid pointer) or call_timer_fn+0x35/0xf0 __run_timers (inlined) run_timer_softirq+0x162/0x2d0 __do_softirq+0x0f6/0250 (null pointer dereference) The faulting line is a call to NULL or invalid function pointer, namely line 1178 in media_tree/kernel/time/timer.c 1177 trace_timer_expire_entry(timer); 1178 fn(data); 1179 trace_timer_expire_exit(timer); fn is a null pointer if called within the "if (irqsafe)" block or an invalid pointer if called from the respective else branch (ll. 1284 in media_tree/kernel/time/timer.c) * Affected: - v4.2.x - v4.3.x - v4.4-rcX * Not affected: v4.1.x * Bisect result on git://github.com/torvalds/linux.git/master between v4.1 and v4.2 2f1ea29fca781b8e6600f3ece1f2dd98ae276294 is the first bad commit commit 2f1ea29fca781b8e6600f3ece1f2dd98ae276294 Author: Antti Palosaari <crope <at> iki.fi> Date: Sun Sep 7 11:20:34 2014 -0300 [media] si2157: implement signal strength stats Implement DVBv5 signal strength stats. Returns dBm. Signed-off-by: Antti Palosaari <crope <at> iki.fi> Tested-by: Adam Baker <linux <at> baker-net.org.uk> Signed-off-by: Mauro Carvalho Chehab <mchehab <at> osg.samsung.com> :040000 040000 1fc70a3d18532f91289e8b581081ee59feefc321 5130e9b011e9c4ba683cd4db3eae8dca67c3ef0e M drivers * Workaround: Reverting this patch on my tested kernels (incl. 4.4.rc8) prevents the kernel panic. BR, Martin P.S.: Bisect log: user <at> host:/a/b/c$ git bisect log # bad: [64291f7db5bd8150a74ad2036f1037e6a0428df2] Linux 4.2 # good: [b953c0d234bc72e8489d3bf51a276c5c4ec85345] Linux 4.1 git bisect start 'v4.2' 'v4.1' # bad: [c11d716218910c3aa2bac1bb641e6086ad649555] Merge tag 'armsoc-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc git bisect bad c11d716218910c3aa2bac1bb641e6086ad649555 # good: [8a8c35fadfaf55629a37ef1a8ead1b8fb32581d2] mm: kmemleak_alloc_percpu() should follow the gfp from per_alloc() git bisect good 8a8c35fadfaf55629a37ef1a8ead1b8fb32581d2 # good: [14738e03312ff1137109d68bcbf103c738af0f4a] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input git bisect good 14738e03312ff1137109d68bcbf103c738af0f4a # good: [4570a37169d4b44d316f40b2ccc681dc93fedc7b] Merge tag 'sound-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound git bisect good 4570a37169d4b44d316f40b2ccc681dc93fedc7b # bad: [78aad7f81aa6dfccdb2804ac35db6fc371d265cf] [media] vivid-tpg: precalculate colorspace/xfer_func combinations git bisect bad 78aad7f81aa6dfccdb2804ac35db6fc371d265cf # good: [356484cabe44984d2dc66a90bd5e3465ba1f64fb] [media] dw2102: resync fifo when demod locks git bisect good 356484cabe44984d2dc66a90bd5e3465ba1f64fb # good: [e4aa18d33c3a05f9ac51a8c8c7863318c807650f] [media] DocBook: Improve the description of the properties API git bisect good e4aa18d33c3a05f9ac51a8c8c7863318c807650f # good: [e01dfc01914ab9a078ca8d08287c19c6663b5438] [media] videodev2.h: add COLORSPACE_DEFAULT git bisect good e01dfc01914ab9a078ca8d08287c19c6663b5438 # good: [dc9ef7d11207a04514ca195f0c9f4d2ac56696e1] [media] DocBook media: rewrite frontend open/close git bisect good dc9ef7d11207a04514ca195f0c9f4d2ac56696e1 # bad: [5ac417efe66ddd7cd70a98f7f4e32a14ae40a651] [media] sh_vou: avoid going past arrays git bisect bad 5ac417efe66ddd7cd70a98f7f4e32a14ae40a651 # bad: [171fe6d1270d535eae798e4b5acc9f5d25e6e17e] [media] media: davinci_vpfe: set minimum required buffers to three git bisect bad 171fe6d1270d535eae798e4b5acc9f5d25e6e17e # good: [d2b72f6482b9a3c57f036c11786a2489dcc81176] [media] si2168: Implement own I2C adapter locking git bisect good d2b72f6482b9a3c57f036c11786a2489dcc81176 # bad: [694f9963edd831e4ed6fdbcb7134525cf5715a79] [media] media: davinci_vpfe: clear the output_specs git bisect bad 694f9963edd831e4ed6fdbcb7134525cf5715a79 # bad: [2f1ea29fca781b8e6600f3ece1f2dd98ae276294] [media] si2157: implement signal strength stats git bisect bad 2f1ea29fca781b8e6600f3ece1f2dd98ae276294 # first bad commit: [2f1ea29fca781b8e6600f3ece1f2dd98ae276294] [media] si2157: implement signal strength stats ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: linux-image-4.2.0-23-generic 4.2.0-23.28 ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6 Uname: Linux 4.2.0-23-generic x86_64 ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D2c', '/dev/snd/pcmC1D3p', '/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', '/dev/snd/controlC1', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D3p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Date: Sat Jan 9 10:53:16 2016 HibernationDevice: RESUME=UUID=9b9f7b19-cb13-45bc-8d5f-acd5610a93dd InstallationDate: Installed on 2014-07-09 (548 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) IwConfig: eth0 no wireless extensions. lo no wireless extensions. MachineType: ASUS All Series ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-23-generic.efi.signed root=UUID=9613d690-85bf-4888-aa33-e0df9be775e7 ro PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.2.0-23-generic N/A linux-backports-modules-4.2.0-23-generic N/A linux-firmware 1.149.3 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/15/2015 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 2404 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: H97M-E dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev X.0x dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2404:bd05/15/2015:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH97M-E:rvrRevX.0x:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: All Series dmi.product.version: System Version dmi.sys.vendor: ASUS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1532412/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
