Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936188Ab3DIU0n (ORCPT ); Tue, 9 Apr 2013 16:26:43 -0400 Received: from mail-wi0-f181.google.com ([209.85.212.181]:42558 "EHLO mail-wi0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935949Ab3DIU0k (ORCPT ); Tue, 9 Apr 2013 16:26:40 -0400 MIME-Version: 1.0 Reply-To: sedat.dilek@gmail.com In-Reply-To: References: <31778276.CDMUtaAAnc@vostro.rjw.lan>

Date: Tue, 9 Apr 2013 22:26:38 +0200 Message-ID: Subject: Re: linux-next: Tree for Apr 9 [cpufreq: NULL pointer deref] From: Sedat Dilek To: Viresh Kumar Cc: "Rafael J. Wysocki" , Stephen Rothwell , linux-next@vger.kernel.org, linux-kernel@vger.kernel.org, cpufreq@vger.kernel.org, Linux PM list , Thorsten Glaser Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6036 Lines: 132 On Tue, Apr 9, 2013 at 8:39 PM, Sedat Dilek wrote: > On Tue, Apr 9, 2013 at 8:29 PM, Sedat Dilek wrote: >> On Tue, Apr 9, 2013 at 8:26 PM, Sedat Dilek wrote: >>> On Tue, Apr 9, 2013 at 6:51 PM, Viresh Kumar wrote: >>>> On 9 April 2013 21:38, Sedat Dilek wrote: >>>>> With x=3 the system gets in an unuseable state. >>>>> >>>>> root# echo 0 > /sys/devices/system/cpu/cpu3/online >>>>> >>>>> I could not write my reply and had to do a hard/cold reboot. >>>>> The dmesg log I saw looked similiar to my digicam-shot. >>>> >>>> Few things i need from you. First is output of cpufreq-info. Then >>>> all the steps you did to reproduce above? Removed any other cpus? >>>> >>>> I am not able to find next-20130326 tag in my repo, only have 23 and 28. >>>> Can you debug it a bit to find exact line of code causing this issue using >>>> objdump? >>>> >>>> HINT: Documentation/BUG-HUNTING.. >>>> >>>> Give me line numbers of both of these functions: __cpufreq_governor() and >>>> __cpufreq_remove_dev(). >>> >>> I have recompiled next-20130326 and the REGRESSION is still reproducible. >>> >>> Attached are my dmesg, kernel-config, tarball of my drivers/cpufreq >>> build-dir, objdump of cpufreq_governor.o and the list of my current >>> amd64-toolchain. >>> >>> Hope this helps you! >>> >>> Regards, >>> - Sedat - >> >> $ cd linux-next/ >> >> $ objdump --disassemble-all drivers/cpufreq/cpufreq.o > >> /tmp/cpufreq_o--disassemble-all.txt >> >> ...attached. >> >> - Sedat - > > Hmm, I remembered Thorsten Glaser told be to pass also "-Mintel" > parameter ("-D" shortform for "--disassemble-all"): > > $ objdump -D -Mintel drivers/cpufreq/cpufreq.o > /tmp/cpufreq_o-D-Mintel.txt > > File attached. > > Hope this helps you. > > - Sedat - The issue was also seen with a vfs-next-fixed Linux-Next (next-20130409). - Sedat - [ 2454.415601] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030 [ 2454.421017] IP: [] __cpufreq_governor+0x1a/0x100 [ 2454.423777] PGD c6219067 PUD c620d067 PMD 0 [ 2454.426360] Oops: 0000 [#1] SMP [ 2454.428850] Modules linked in: btrfs xor zlib_deflate raid6_pq xfs libcrc32c snd_hda_codec_hdmi snd_hda_codec_realtek coretemp kvm_intel kvm snd_hda_intel snd_hda_codec arc4 iwldvm snd_hwdep joydev i915 snd_pcm ghash_clmulni_intel mac80211 aesni_intel parport_pc snd_page_alloc xts rfcomm snd_seq_midi aes_x86_64 bnep ppdev snd_seq_midi_event lrw snd_rawmidi gf128mul snd_seq i2c_algo_bit ablk_helper uvcvideo iwlwifi cryptd drm_kms_helper snd_timer drm videobuf2_vmalloc snd_seq_device psmouse btusb videobuf2_memops snd videobuf2_core microcode bluetooth cfg80211 soundcore videodev samsung_laptop serio_raw wmi lp mac_hid video lpc_ich parport hid_generic r8169 usbhid hid [ 2454.440355] CPU 3 [ 2454.440386] Pid: 5409, comm: bash Not tainted 3.9.0-rc6-next20130409-4-iniza-small #1 SAMSUNG ELECTRONICS CO., LTD. 530U3BI/530U4BI/530U4BH/530U3BI/530U4BI/530U4BH [ 2454.446497] RIP: 0010:[] [] __cpufreq_governor+0x1a/0x100 [ 2454.449734] RSP: 0018:ffff8800c624bca8 EFLAGS: 00010282 [ 2454.452977] RAX: ffffffff81cc16c0 RBX: ffff880118038200 RCX: 00000001820001fa [ 2454.456260] RDX: 00000001820001fb RSI: 0000000000000000 RDI: ffff880118038200 [ 2454.459567] RBP: ffff8800c624bcc8 R08: 0000000000000000 R09: ffffea000461fc80 [ 2454.462797] R10: ffffffff81346139 R11: 0000000000000246 R12: 0000000000000005 [ 2454.465940] R13: ffff88011facc348 R14: 0000000000010b40 R15: 0000000000000003 [ 2454.468999] FS: 00007f4e705f7700(0000) GS:ffff88011fac0000(0000) knlGS:0000000000000000 [ 2454.472097] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2454.475132] CR2: 0000000000000030 CR3: 00000000c621e000 CR4: 00000000000407e0 [ 2454.478206] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 2454.481288] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 2454.484362] Process bash (pid: 5409, threadinfo ffff8800c624a000, task ffff88005f969740) [ 2454.487463] Stack: [ 2454.490545] 0000000000010b40 0000000000000003 ffff880118038200 0000000000000003 [ 2454.493713] ffff8800c624bd38 ffffffff81570bdd ffffffff81cda920 ffff8800c624be04 [ 2454.496899] ffffffff816abb28 ffffffff00000001 0000000000000003 0000000000010b48 [ 2454.500101] Call Trace: [ 2454.503265] [] __cpufreq_remove_dev.isra.12+0x25d/0x390 [ 2454.506402] [] ? powernowk8_cpu_init_on_cpu+0xa9/0xa9 [ 2454.509527] [] cpufreq_cpu_callback+0x47/0x5c [ 2454.512636] [] notifier_call_chain+0x4d/0x70 [ 2454.515716] [] __raw_notifier_call_chain+0xe/0x10 [ 2454.518781] [] __cpu_notify+0x20/0x40 [ 2454.521823] [] _cpu_down+0x81/0x280 [ 2454.524858] [] cpu_down+0x35/0x50 [ 2454.527900] [] store_online+0x63/0xc0 [ 2454.530958] [] dev_attr_store+0x18/0x30 [ 2454.534039] [] sysfs_write_file+0xef/0x170 [ 2454.537127] [] vfs_write+0xce/0x1e0 [ 2454.540223] [] SyS_write+0x52/0xa0 [ 2454.543315] [] ? __close_fd+0x90/0xc0 [ 2454.546406] [] system_call_fastpath+0x1a/0x1f [ 2454.549495] Code: c3 49 c7 c6 ea ff ff ff eb e2 0f 1f 80 00 00 00 00 66 66 66 66 90 55 48 89 e5 41 54 41 89 f4 53 48 89 fb 48 83 ec 10 48 8b 77 68 <8b> 46 30 85 c0 74 09 3b 47 54 0f 82 a0 00 00 00 48 8b 7e 48 e8 [ 2454.556603] RIP [] __cpufreq_governor+0x1a/0x100 [ 2454.560102] RSP [ 2454.563569] CR2: 0000000000000030 [ 2454.581144] ---[ end trace 62364c4fbb57b30b ]--- - EOT - -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/