Re: [Intel-gfx] v3.5 Oops in i2c_algo_bit.c:bit_xfer+0x23/0x870: i915 or i2c?
On Mon, 13 Aug 2012, Daniel Vetter dan...@ffwll.ch wrote: On Sun, Aug 12, 2012 at 11:49:22PM -0400, George Spelvin wrote: (Bringing this back to the mailing lists after a bit of uninteresting private conversation.) Honestly, I think we need a way to force disable gmbus with a module parameter or something anyway. It's not the first time gmbus has been implicated with an issue. Maybe it even exists already, but I couldn't find this. So if you confirm that fixes the problem for you on the ml, at least maybe such a patch will be the result. If you feel it's a software bug (which I agree it seems likely), a bisect is always much appreciated. Personally, I'll usually step back major releases until something works, or I hit 3.2ish. Even knowing it never worked through 3.2 is helpful. It's a friend's machine, which I normally only have remote access to, so it's a bit pf a pain, but I can manage. I just thought a basic i3 motherboard was so common I couldn't possibly be the only one with this problem. Here's the 3.2 dmesg showing the fallback working, but this is an Ubuntu-patched kernel (linux-image-3.2.0-29-generic) that may be a fair distance from stock: One thing of interest would be the exact .config you use to build the kernel and the output of lsmod (after the kernel crashed). I guess the issue is with the combination of drivers you have (i2c_detect in the calltrace calls back into other registered i2c drivers ...). Hi all, this smells a bit like [1], don't you think? George, can you check the patch I just sent to (hopefully) fix that issue? Thanks. BR, Jani. [1] http://thread.gmane.org/gmane.linux.kernel/1339794 ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
Re: [Intel-gfx] v3.5 Oops in i2c_algo_bit.c:bit_xfer+0x23/0x870: i915 or i2c?
On 2012-08-08 21:50, George Spelvin wrote: I'm trying to run a v3.5 kernel (plus some -stable patches from Ted Ts'o) on an Ubuntu system. Things are generally working except for the following Oops on each boot, which prevents the graphics system from loading. [ 36.187972] [drm] Initialized drm 1.1.0 20060810 [ 36.230306] kvm: VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL does not work properly. Using workaround [ 36.487606] i915 :00:02.0: setting latency timer to 64 [ 36.555464] [drm] GMBUS [i915 gmbus ssc] timed out, falling back to bit banging on pin 0 [ 36.555490] BUG: unable to handle kernel NULL pointer dereference at 0028 [ 36.555626] IP: [a01807b3] bit_xfer+0x23/0x870 [i2c_algo_bit] [ 36.555701] PGD 212cb0067 PUD 212caf067 PMD 0 [ 36.555803] Oops: [#1] SMP [ 36.555885] CPU 3 [ 36.555907] Modules linked in: snd_seq_midi joydev i915(+) snd_rawmidi snd_seq_midi_event snd_seq drm_kms_helper snd_timer snd_seq_device kvm_intel drm kvm snd serio_raw soundcore i2c_algo_bit snd_page_alloc lpc_ich video mei microcode mac_hid eeprom it87 hwmon_vid coretemp lp parport raid10 raid456 async_pq async_xor firewire_ohci firewire_core xor async_memcpy async_raid6_recov hid_microsoft floppy crc_itu_t r8169 pata_jmicron usbhid hid mptsas mptscsih mptbase scsi_transport_sas raid6_pq async_tx raid1 raid0 multipath linear [ 36.557232] [ 36.557271] Pid: 623, comm: modprobe Not tainted 3.5.0 #3 Gigabyte Technology Co., Ltd. H57M-USB3/H57M-USB3 [ 36.557398] RIP: 0010:[a01807b3] [a01807b3] bit_xfer+0x23/0x870 [i2c_algo_bit] [ 36.557493] RSP: :880212c6d648 EFLAGS: 00010296 [ 36.557544] RAX: 88021222c030 RBX: 880212c6d7e8 RCX: [ 36.557599] RDX: 0001 RSI: 880212c6d7e8 RDI: 88021222c030 [ 36.557655] RBP: 880212c6d6c8 R08: 0402 R09: [ 36.557710] R10: R11: 0006 R12: 0001 [ 36.557766] R13: 880212c6dfd8 R14: 0001 R15: 88021222c030 [ 36.557822] FS: 7f5a7b85b700() GS:88021fcc() knlGS: [ 36.557899] CS: 0010 DS: ES: CR0: 8005003b [ 36.557950] CR2: 0028 CR3: 000212cad000 CR4: 07e0 [ 36.558006] DR0: DR1: DR2: [ 36.558062] DR3: DR6: 0ff0 DR7: 0400 [ 36.558119] Process modprobe (pid: 623, threadinfo 880212c6c000, task 88020fdf5b80) [ 36.558197] Stack: [ 36.558239] 0001 880212c6dfd8 0001 00011222c000 [ 36.558380] 880212c6d6c8 8166341e 88020ff6ca72 000c510c0018 [ 36.558523] 880212c6d6d8 880212c6d698 0082 880212c6d7e8 [ 36.558671] Call Trace: [ 36.558719] [8166341e] ? printk+0x61/0x63 [ 36.558790] [a02e5a0b] gmbus_xfer+0x56b/0x6f0 [i915] [ 36.558847] [814ee7dc] i2c_transfer+0x9c/0xe0 [ 36.558899] [811be91b] ? ep_poll_callback+0x10b/0x150 [ 36.558953] [814ee976] i2c_smbus_xfer_emulated+0x156/0x5d0 [ 36.559010] [81321d25] ? idr_get_empty_slot+0x115/0x320 [ 36.559064] [814eefb3] i2c_smbus_xfer+0x113/0x130 [ 36.559118] [8166e51e] ? _raw_spin_lock+0xe/0x20 [ 36.559173] [81642fd9] ? klist_next+0x89/0x110 [ 36.559225] [814ef61b] i2c_default_probe+0xeb/0x130 [ 36.559279] [814ee18b] ? i2c_check_addr_busy+0x3b/0x60 [ 36.559332] [814f077b] i2c_do_add_adapter+0x1bb/0x290 [ 36.559382] [811ed1cb] ? sysfs_do_create_link+0xeb/0x200 [ 36.559433] [81411897] ? put_device+0x17/0x20 [ 36.559482] [814f0880] ? __process_new_driver+0x30/0x30 [ 36.559535] [814f0892] __process_new_adapter+0x12/0x20 [ 36.559590] [814140ee] bus_for_each_drv+0x4e/0xa0 [ 36.559642] [814f029d] i2c_register_adapter+0x16d/0x270 [ 36.559696] [814f0443] i2c_add_adapter+0xa3/0xb0 [ 36.559759] [a02e5cfc] intel_setup_gmbus+0xcc/0x1f0 [i915] [ 36.559821] [a02a938c] i915_driver_load+0x2ac/0xb90 [i915] [ 36.559882] [a03f1b41] ? drm_get_minor+0x261/0x300 [drm] [ 36.559940] [a03f4236] drm_get_pci_dev+0x186/0x2d0 [drm] [ 36.559995] [8103c3e9] ? default_spin_lock_flags+0x9/0x10 [ 36.560060] [a02f2142] i915_pci_probe+0x16/0x20 [i915] [ 36.560115] [813522ac] local_pci_probe+0x5c/0xd0 [ 36.560168] [81352431] pci_device_probe+0x111/0x120 [ 36.560221] [81415ede] driver_probe_device+0x7e/0x220 [ 36.560274] [8141612b] __driver_attach+0xab/0xb0 [ 36.560327] [81416080] ? driver_probe_device+0x220/0x220 [ 36.560375] [81414195] bus_for_each_dev+0x55/0x90 [ 36.560421] [a0323000] ? 0xa0322fff [ 36.560470] [814158de]
