From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============8272160997820145737==" MIME-Version: 1.0 From: Chris Metcalf To: lkp@lists.01.org Subject: Re: [watchdog] 8fcf2cc768a: BUG: unable to handle kernel NULL pointer dereference at (null) Date: Wed, 06 May 2015 11:15:21 -0400 Message-ID: <554A3009.8060005@ezchip.com> In-Reply-To: <1430882046.5148.2.camel@intel.com> List-Id: --===============8272160997820145737== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Thank you. Andrew has a fix that he will pick up for his tree. On 5/5/2015 11:14 PM, Huang Ying wrote: > FYI, we noticed the below changes on > > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > commit 8fcf2cc768acd845c1fed837bf9cfe2d7106336d ("watchdog: add watchdog_= cpumask sysctl to assist nohz") > > > +------------------------------------------+------------+------------+ > | | ac2a46075f | 8fcf2cc768 | > +------------------------------------------+------------+------------+ > | boot_successes | 32 | 0 | > | early-boot-hang | 1 | | > | boot_failures | 0 | 30 | > | BUG:unable_to_handle_kernel | 0 | 30 | > | Oops | 0 | 30 | > | RIP:find_first_bit | 0 | 30 | > | Kernel_panic-not_syncing:Fatal_exception | 0 | 30 | > | backtrace:lockup_detector_init | 0 | 30 | > | backtrace:kernel_init_freeable | 0 | 30 | > +------------------------------------------+------------+------------+ > > > [ 0.066023] TSC deadline timer enabled > [ 0.066995] smpboot: CPU0: Intel Core Processor (Haswell) (fam: 06, mo= del: 3c, stepping: 01) > [ 0.068023] Performance Events: unsupported p6 CPU model 60 no PMU dri= ver, software events only. > [ 0.069756] BUG: unable to handle kernel NULL pointer dereference at = (null) > [ 0.070000] IP: [] find_first_bit+0x9/0x60 > [ 0.070000] PGD 0 > [ 0.070000] Oops: 0000 [#1] SMP > [ 0.070000] Modules linked in: > [ 0.070000] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.1.0-rc1-next-2= 0150501-01653-gf4f4e07 #7 > [ 0.070000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIO= S 1.7.5-20140531_083030-gandalf 04/01/2014 > [ 0.070000] task: ffff880036f08000 ti: ffff880036f04000 task.ti: ffff8= 80036f04000 > [ 0.070000] RIP: 0010:[] [] find_= first_bit+0x9/0x60 > [ 0.070000] RSP: 0000:ffff880036f07e68 EFLAGS: 00010202 > [ 0.070000] RAX: 00000000ee6b2800 RBX: 0000000000000002 RCX: 000000000= 000001b > [ 0.070000] RDX: ffffffff82200280 RSI: 0000000000000002 RDI: 000000000= 0000000 > [ 0.070000] RBP: ffff880036f07e68 R08: 0000000000000010 R09: 000000000= 000001f > [ 0.070000] R10: 00000000a13c5bac R11: 000000000000001a R12: 000000000= 0000000 > [ 0.070000] R13: 0000000000002780 R14: 0000000000000000 R15: 000000000= 0000000 > [ 0.070000] FS: 0000000000000000(0000) GS:ffff880037200000(0000) knlG= S:0000000000000000 > [ 0.070000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 0.070000] CR2: 0000000000000000 CR3: 0000000001cb7000 CR4: 000000000= 00406f0 > [ 0.070000] Stack: > [ 0.070000] ffff880036f07e88 ffffffff81eb8e33 ffffffff82200280 ffffff= ff820214f8 > [ 0.070000] ffff880036f07f38 ffffffff81e920b8 0000000000000001 000000= 0000000000 > [ 0.070000] 0000000000000000 0000000000000000 0000000000000000 000000= 0000000000 > [ 0.070000] Call Trace: > [ 0.070000] [] lockup_detector_init+0x33/0x79 > [ 0.070000] [] kernel_init_freeable+0x128/0x248 > [ 0.070000] [] ? rest_init+0x90/0x90 > [ 0.070000] [] kernel_init+0xe/0xf0 > [ 0.070000] [] ret_from_fork+0x42/0x70 > [ 0.070000] [] ? rest_init+0x90/0x90 > [ 0.070000] Code: 66 90 48 83 c4 28 48 89 d8 5b 41 5c 41 5d 41 5e 41 5= f 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 85 f6 48 89 e5 74 4= b <48> 8b 0f 48 83 c7 08 ba 40 00 00 00 48 85 c9 74 19 eb 21 0f 1f > [ 0.070000] RIP [] find_first_bit+0x9/0x60 > [ 0.070000] RSP > [ 0.070000] CR2: 0000000000000000 > [ 0.070000] ---[ end trace 94e3b40ec52f43d8 ]--- > [ 0.070000] Kernel panic - not syncing: Fatal exception > > > > Thanks, > Ying Huang > > > > _______________________________________________ > LKP mailing list > LKP(a)linux.intel.com -- = Chris Metcalf, EZChip Semiconductor http://www.ezchip.com --===============8272160997820145737== Content-Type: text/html MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="attachment.html" PGh0bWw+CiAgPGhlYWQ+CiAgICA8bWV0YSBjb250ZW50PSJ0ZXh0L2h0bWw7IGNoYXJzZXQ9d2lu ZG93cy0xMjUyIgogICAgICBodHRwLWVxdWl2PSJDb250ZW50LVR5cGUiPgogIDwvaGVhZD4KICA8 Ym9keSBiZ2NvbG9yPSIjRkZGRkZGIiB0ZXh0PSIjMDAwMDAwIj4KICAgIFRoYW5rIHlvdS6gIEFu 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