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Message-ID: <alpine.LSU.2.00.1209261241190.2175@eggly.anvils>
Date:	Wed, 26 Sep 2012 12:51:30 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Sedat Dilek <sedat.dilek@...il.com>
cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	durgadoss.r@...el.com, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Dave Airlie <airlied@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	linux-pci@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
	DRI <dri-devel@...ts.freedesktop.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: inux-next: Tree for Sept 26 (not bootable on AMD64:
 thermal|acpi|drm/i915|pci related?)

On Wed, 26 Sep 2012, Sedat Dilek wrote:
> 
> on my Ubuntu/precise AMD64 today's Linux-Next runs into the following
> call-trace (machine freezes):
> 
>  Sep 26 19:22:58 fambox kernel: [   11.124739] BUG: unable to handle
> kernel NULL pointer dereference at 0000000000000018
> Sep 26 19:22:58 fambox kernel: [   11.124806] IP: [<ffffffff814bb058>]
> thermal_cooling_device_register+0x2c8/0x3d0
> Sep 26 19:22:58 fambox kernel: [   11.124869] PGD 0
> Sep 26 19:22:58 fambox kernel: [   11.124895] Oops: 0000 [#1] SMP
> Sep 26 19:22:58 fambox kernel: [   11.124919] Modules linked in:
> coretemp kvm_intel kvm snd_hda_intel(+) arc4 snd_hda_codec iwldvm
> snd_hwdep ghash_clmulni_intel snd_pcm aesni_intel uvcvideo mac80211
> aes_x86_64 snd_page_alloc ablk_helper i915(+) snd_seq_midi cryptd
> videobuf2_vmalloc snd_seq_midi_event xts videobuf2_memops lrw
> snd_rawmidi videobuf2_core joydev gf128mul videodev snd_seq
> snd_seq_device hid_generic snd_timer drm_kms_helper iwlwifi drm snd
> psmouse i2c_algo_bit soundcore btusb microcode serio_raw
> samsung_laptop wmi cfg80211 bluetooth mei mac_hid video lpc_ich lp
> parport ext4 jbd2 usbhid hid r8169
> Sep 26 19:22:58 fambox kernel: [   11.125319] CPU 2
> Sep 26 19:22:58 fambox kernel: [   11.125332] Pid: 579, comm: modprobe
> Not tainted 3.6.0-rc7-next20120926-2-iniza-generic #1 SAMSUNG
> ELECTRONICS CO., LTD. 530U3BI/530U4BI/530U4BH/530U3BI/530U4BI/530U4BH
> Sep 26 19:22:58 fambox kernel: [   11.125401] RIP:
> 0010:[<ffffffff814bb058>]  [<ffffffff814bb058>]
> thermal_cooling_device_register+0x2c8/0x3d0
> Sep 26 19:22:58 fambox kernel: [   11.125450] RSP:
> 0018:ffff88010f23d838  EFLAGS: 00010246
> Sep 26 19:22:58 fambox kernel: [   11.125475] RAX: 0000000000000000
> RBX: ffff88010bfd4c00 RCX: 0000000000000001
> Sep 26 19:22:58 fambox kernel: [   11.125507] RDX: 0000000000000000
> RSI: 0000000000000282 RDI: 0000000000000282
> Sep 26 19:22:58 fambox kernel: [   11.125539] RBP: ffff88010f23d878
> R08: 0000000000000000 R09: 0000000000000001
> Sep 26 19:22:58 fambox kernel: [   11.125570] R10: ffff8801054fc460
> R11: 0000000000000000 R12: ffff88010bfd4c04
> Sep 26 19:22:58 fambox kernel: [   11.125602] R13: ffff88011a73e000
> R14: 0000000000000000 R15: 0000000000000000
> Sep 26 19:22:58 fambox kernel: [   11.125634] FS:
> 00007f6b8da29700(0000) GS:ffff88011fa80000(0000)
> knlGS:0000000000000000
> Sep 26 19:22:58 fambox kernel: [   11.125670] CS:  0010 DS: 0000 ES:
> 0000 CR0: 0000000080050033
> Sep 26 19:22:58 fambox kernel: [   11.125697] CR2: 0000000000000018
> CR3: 0000000110185000 CR4: 00000000000407e0
> Sep 26 19:22:58 fambox kernel: [   11.125729] DR0: 0000000000000000
> DR1: 0000000000000000 DR2: 0000000000000000
> Sep 26 19:22:58 fambox kernel: [   11.125761] DR3: 0000000000000000
> DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Sep 26 19:22:58 fambox kernel: [   11.125793] Process modprobe (pid:
> 579, threadinfo ffff88010f23c000, task ffff880116648000)
> Sep 26 19:22:58 fambox kernel: [   11.127133] Stack:
> Sep 26 19:22:58 fambox kernel: [   11.128461]  ffff88011a5d9098
> ffff88010d74c300 ffff88010f23d878 ffff880110b06480
> Sep 26 19:22:58 fambox kernel: [   11.129755]  ffff88010bfd1000
> ffff88011a5d9098 ffff88010d74c300 ffff88011a625000
> Sep 26 19:22:58 fambox kernel: [   11.130943]  ffff88010f23d958
> ffffffffa00e5868 0000000000000000 ffffffff811fa033
> Sep 26 19:22:58 fambox kernel: [   11.132749] Call Trace:
> Sep 26 19:22:58 fambox kernel: [   11.133939]  [<ffffffffa00e5868>]
> acpi_video_bus_add+0x9ba/0xce6 [video]
> Sep 26 19:22:58 fambox kernel: [   11.135130]  [<ffffffff811fa033>] ?
> sysfs_addrm_finish+0x33/0xc0
> Sep 26 19:22:58 fambox kernel: [   11.136313]  [<ffffffff813454cc>]
> acpi_device_probe+0x4e/0x11c
> Sep 26 19:22:58 fambox kernel: [   11.137482]  [<ffffffff813d472b>]
> driver_probe_device+0x7b/0x240
> Sep 26 19:22:58 fambox kernel: [   11.138642]  [<ffffffff813d499b>]
> __driver_attach+0xab/0xb0
> Sep 26 19:22:58 fambox kernel: [   11.139798]  [<ffffffff813d48f0>] ?
> driver_probe_device+0x240/0x240
> Sep 26 19:22:58 fambox kernel: [   11.140981]  [<ffffffff813d2b46>]
> bus_for_each_dev+0x56/0x90
> Sep 26 19:22:58 fambox kernel: [   11.142129]  [<ffffffff813d425e>]
> driver_attach+0x1e/0x20
> Sep 26 19:22:58 fambox kernel: [   11.143264]  [<ffffffff813d3dd0>]
> bus_add_driver+0x190/0x290
> Sep 26 19:22:58 fambox kernel: [   11.144443]  [<ffffffff813d4efa>]
> driver_register+0x7a/0x160
> Sep 26 19:22:58 fambox kernel: [   11.145583]  [<ffffffff81345ccf>]
> acpi_bus_register_driver+0x43/0x45
> Sep 26 19:22:58 fambox kernel: [   11.146871]  [<ffffffffa00e4dac>]
> acpi_video_register+0x20/0x39 [video]
> Sep 26 19:22:58 fambox kernel: [   11.148167]  [<ffffffffa02f4bad>]
> i915_driver_load+0x83d/0xea0 [i915]
> Sep 26 19:22:58 fambox kernel: [   11.149451]  [<ffffffffa020ebc1>]
> drm_get_pci_dev+0x191/0x2b0 [drm]
> Sep 26 19:22:58 fambox kernel: [   11.150739]  [<ffffffffa0345e2b>]
> i915_pci_probe+0x4f/0x57 [i915]
> Sep 26 19:22:58 fambox kernel: [   11.152015]  [<ffffffff81309af9>]
> local_pci_probe+0x79/0x100
> Sep 26 19:22:58 fambox kernel: [   11.153287]  [<ffffffff8130b1f9>]
> pci_device_probe+0x109/0x130
> Sep 26 19:22:58 fambox kernel: [   11.154546]  [<ffffffff813d472b>]
> driver_probe_device+0x7b/0x240
> Sep 26 19:22:58 fambox kernel: [   11.155796]  [<ffffffff813d499b>]
> __driver_attach+0xab/0xb0
> Sep 26 19:22:58 fambox kernel: [   11.157048]  [<ffffffff813d48f0>] ?
> driver_probe_device+0x240/0x240
> Sep 26 19:22:58 fambox kernel: [   11.158280]  [<ffffffff813d2b46>]
> bus_for_each_dev+0x56/0x90
> Sep 26 19:22:58 fambox kernel: [   11.159496]  [<ffffffff813d425e>]
> driver_attach+0x1e/0x20
> Sep 26 19:22:58 fambox kernel: [   11.160708]  [<ffffffff813d3dd0>]
> bus_add_driver+0x190/0x290
> Sep 26 19:22:58 fambox kernel: [   11.161909]  [<ffffffff813d4efa>]
> driver_register+0x7a/0x160
> Sep 26 19:22:58 fambox kernel: [   11.163121]  [<ffffffff8130a159>]
> __pci_register_driver+0x49/0x50
> Sep 26 19:22:58 fambox kernel: [   11.164227]  [<ffffffffa020edfa>]
> drm_pci_init+0x11a/0x130 [drm]
> Sep 26 19:22:58 fambox kernel: [   11.165295]  [<ffffffffa037c000>] ?
> 0xffffffffa037bfff
> Sep 26 19:22:58 fambox kernel: [   11.166351]  [<ffffffffa037c066>]
> i915_init+0x66/0x68 [i915]
> Sep 26 19:22:58 fambox kernel: [   11.167360]  [<ffffffff8100203f>]
> do_one_initcall+0x3f/0x170
> Sep 26 19:22:58 fambox kernel: [   11.168332]  [<ffffffff810bc9be>]
> sys_init_module+0xbe/0x220
> Sep 26 19:22:58 fambox kernel: [   11.169276]  [<ffffffff8164a0bd>]
> system_call_fastpath+0x1a/0x1f
> Sep 26 19:22:58 fambox kernel: [   11.170200] Code: 1b 7e 00 48 3d c0
> cb c9 81 4c 8d a8 b0 fc ff ff 0f 84 bf 00 00 00 0f 1f 44 00 00 4d 8b
> bd f0 02 00 00 4d 85 ff 0f 84 c0 00 00 00 <49> 8b 77 18 48 85 f6 0f 84
> d3 fe ff ff 41 8b 47 14 85 c0 7e 7b
> Sep 26 19:22:58 fambox kernel: [   11.172467] RIP
> [<ffffffff814bb058>] thermal_cooling_device_register+0x2c8/0x3d0
> Sep 26 19:22:58 fambox kernel: [   11.173542]  RSP <ffff88010f23d838>
> Sep 26 19:22:58 fambox kernel: [   11.174603] CR2: 0000000000000018
> Sep 26 19:22:58 fambox kernel: [   11.175675] ---[ end trace
> 0f2bc437662fc097 ]---
> 
> I have CCed some maintainers, hope they might have a look at it
> (sorry, didnt check any MLs).
> 
> My kern.log and kernel-config are attached.

I get oops in bind_cdev() called from thermal_cooling_device_register()
on mmotm, I expect yours is the same (but bind_cdev inlined so it doesn't
appear in the backtrace).  This patch gets me booting (note it also fixes
return to break to unlock the mutex), does it help you?  Whether the root
problem is elsewhere or not, I've no idea; but I see Dan already spotted
other errors hereabouts - probably needs more thorough review.

Hugh

--- mmotm/drivers/thermal/thermal_sys.c	2012-09-26 10:15:28.652071362 -0700
+++ linux/drivers/thermal/thermal_sys.c	2012-09-26 11:41:01.549684983 -0700
@@ -252,8 +252,8 @@ static void bind_cdev(struct thermal_coo
 		}
 
 		tzp = pos->tzp;
-		if (!tzp->tbp)
-			return;
+		if (!tzp || !tzp->tbp)
+			break;
 
 		for (i = 0; i < tzp->num_tbps; i++) {
 			if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
--
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