Mark Lord wrote: > This happened on our Mythtv box at startup this morning: > The Oops happened once only, at system startup, on initial device probe. > Not reproduceable, so probably a rare race of some kind. > The xc5000 module was loaded with "init_fw=1" to force f/w load on modprobe. > > 2.6.28 kernel, SMP, x86_64, two CPUs (Core2duo 1.86GHz), 2GB RAM. > > Oops text typed in by hand from screen photos > ( original photos: http://rtr.ca/xc5000_lockup ) > ... > xc5000: firmware read 12332 bytes. > xc5000: firmware upload > BUG kernel NULL pointer dereference at 000000000000000c > IP: [<ffffffff8038fbcf>] acpi_ds_exec_end_op+0x1b/0x3c4 > PGD 7c8cd067 PUD 7d411067 PMD 0 > Oops: 0000 [#1] PREEMPT SMP > last sysfs file: /sys/class/firmware/i2c-2/loading > CPU 0 > ... > Modules linked in: xc5000 au8522 tea5767 tda9887 tda8290 tea5761 fuse au0828(+) > dvd_core usbhid tuner_simple tuner_types snd_hda_intel msp3400 ... nvidia(P) ... > ... > Pid: 2383, comm: modprobe Tainted: P A 2.6.28 #9 > RIP: 0010:[<ffffffff8038fbcf>] [<ffffffff8038fbcf>] acpi_ds_exec_end_op+0x1b/0x3c4 > RSP: 0018:ffff88007a095ad8 EFLAGS: 00010296 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88007f8588f0 > R10: ffff88007f8a4d40 R11: ffff8800000bf9e0 R12: 0000000000000000 > R13: ffff88007e43bc10 R14: ffff88007a0ac000 R15: ffff88007e43bc10 > FS: 00007f844d5666e0(0000) GS:ffffffff8060f540(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > ... > Process modprobe (pid: 2383, threadinfo ffff88007a094000, task ffff88007fa043d0) > Stack: > ffff88007a085380 0000000000000000 ffff88007a085380 ffffffffa09cfb28 > ffff88007e43bc10 ffffffffa09f263f ffff88007a095b18 ffff88007a085380 > ffffc200109e6000 ffff88007a085380 000000000000f9f9 00000000000094d7 > Call Trace: > xc_load_fw_and_init_tuner+0x14b/0x29c [xc5000] > i2c_transfer+0x8a/0x94 > xc5000_init+0x3d/0x6f [xc5000] > xc5000_attach+0x22c/0x256 [xc5000] > __symbol_get+0x2c/0xd3 > au0828+dvb_register+0x2ec/x5cb [au0828] > au0828_usb_probe+0x10c/0x140 [au0828] > usb_match_id+0x32/0x58 [usbcore] > usb_probe_interface+0xfb/0x132 [usbcore] > driver_probe_device+0xb5/0x159 > __driver_attach+0x59/0x80 > __driver_attach+0x0/0x80 > bus_for_each_dev+0x44/0x78 > bus_add_driver+0xac/0x1f2 > driver_register+0xa2/0x11f > usb_register_driver+0x7e/0xe0 [usbcore] > au0828_init+0x0/0xbb [au0828] > au0828_init+0xa1/0xbb [au0828] > _stext+0x56/0x14f > vma_link+0x90/0xa2 > update_curr+0x49/0xf0 > enqueue_task_fair+0x14c/0x161 > check_preempt_wakeup+0xf4/0x124 > try_to_wake_up+0x16a/0x17c > sys_init_module+0xa0/0x1a9 > system_call_fastpath+0x16/0x1b > Code: 00 66 c7 40 0c c0 00 89 d8 48 83 c4 18 5b 5d c3 41 55 41 54 55 48 89 > 48 83 ec 08 48 8b 87 08 03 00 00 4c 8b a7 00 03 00 00 <8a> 50 0c 8a 40 0? > c8 83 f9 0a 75 25 41 0f b7 4c 24 0a 48 > RIP [<ffffffff8038fbcf>] acpi_ds_exec_end_op+0x1b/0x3c4 > RSP <ffff88007a095ad8> > CR2: 000000000000000c > ---[ end trace c23df576c022eb7e ]--- > > Could someone perhaps explain how acpi_ds_exec_end_op even enters the > picture here? I'm confused by that. > > The driver was doing/completing an i2c firmware transfer at the time of > the oops. We removed the "init_fw" module option from the xc5000 module. It is no longer necessary, and prevents us from taking advantage of power saving capabilities. So, the OOPS itself is moot. How did acpi_ds_exec_end_op enter the picture??? That I have no idea. Can you try to reproduce that will a clean (not tainted) kernel? Regards, Mike _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
