Hi! After update from 3.5 kernel to newer version I got kernel oops when I connect my Hercules Blog Webcam. The full error stacktrace is at the end of this e-mail.
Commit bisect revealed the regression at: ------------------------- 1bd7d6adc691993206cf7dd69f1aaf8dccb06677 is the first bad commit commit 1bd7d6adc691993206cf7dd69f1aaf8dccb06677 Author: Antonio Ospite <ospite@xxxxxxxxxxxx> Date: Wed May 16 18:42:46 2012 -0300 [media] gspca_ov534: Convert to the control framework Signed-off-by: Antonio Ospite <ospite@xxxxxxxxxxxx> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxxxx> Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxx> :040000 040000 81bb6d86a59d2fca15fea4d43a8abe34354cf69e 6b7c2077ae5d8bdea32864841b5cd14149c6a44a M drivers ------------------------- I also try to change the gspca_ov534 module source (ov534.c) from the 3.8 kernel and added some additional null checks in sd_start function and add the extensive logging to it. With those changes my webcam is working OK. As far as I can see, sd_start function is called couple of times, but when it is called the first time (when a usb cable was inserted), sd struct is almost empty and without null check this leads to kernel oops. Here is the part of test version log when sd_start was called first time: sd_start: NO sd->hue! sd_start: NO sd->saturation! sd_start: NO sd->autogain! sd_start: NO sd->autowhitebalance! sd_start: NO sd->autoexposure! sd_start: NO sd->gain! sd_start: NO sd->exposure! sd_start: NO sd->brightness! sd_start: NO sd->contrast! sd_start: NO sd->sharpness! sd_start: NO sd->hflip and sd->vflip! sd_start: NO sd->plfreq! Additional info can be found here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1173723/ Here is the error stacktrace: kernel: [ 52.679705] usb 3-2: new high-speed USB device number 2 using xhci_hcd kernel: [ 52.697906] usb 3-2: New USB device found, idVendor=06f8, idProduct=3002 kernel: [ 52.697910] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 kernel: [ 52.697912] usb 3-2: Product: Hercules Blog Microphone kernel: [ 52.697914] usb 3-2: Manufacturer: Hercules Blog Webcam kernel: [ 52.708983] Linux video capture interface: v2.00 kernel: [ 52.710778] gspca_main: v2.14.0 registered kernel: [ 52.712210] gspca_main: ov534-2.14.0 probing 06f8:3002 kernel: [ 55.506311] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050 kernel: [ 55.506367] IP: [<ffffffffa03c1b01>] v4l2_ctrl_g_ctrl+0x11/0x60 [videodev] kernel: [ 55.506414] PGD 0 kernel: [ 55.506429] Oops: 0000 [#1] SMP kernel: [ 55.506453] Modules linked in: gspca_ov534(+) gspca_main videodev rfcomm bnep ppdev bluetooth binfmt_misc snd_hda_codec_hdmi snd_hda_codec_realtek stir4200 irda crc_ccitt usblp snd_hda_intel snd_hda_codec snd_hwdep snd_pcm hid_generic snd_page_alloc snd_seq_midi snd_seq_midi_event usbhid snd_rawmidi snd_seq snd_seq_device snd_timer hid i915 snd psmouse drm_kms_helper serio_raw mei_me drm mei soundcore video i2c_algo_bit lpc_ich mac_hid coretemp lp parport firewire_ohci firewire_core crc_itu_t ahci libahci alx mdio r8169 mii [last unloaded: parport_pc] kernel: [ 55.506819] CPU: 3 PID: 4352 Comm: modprobe Not tainted 3.11.0-031100rc2-generic #201307211535 kernel: [ 55.506864] Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./Z77-DS3H, BIOS F9 09/19/2012 kernel: [ 55.506913] task: ffff8801c20f9770 ti: ffff8801ceaa0000 task.ti: ffff8801ceaa0000 kernel: [ 55.506952] RIP: 0010:[<ffffffffa03c1b01>] [<ffffffffa03c1b01>] v4l2_ctrl_g_ctrl+0x11/0x60 [videodev] kernel: [ 55.507005] RSP: 0018:ffff8801ceaa1af8 EFLAGS: 00010292 kernel: [ 55.507033] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 000000000001988b kernel: [ 55.507069] RDX: 000000000001988a RSI: ffffffffa032745a RDI: 0000000000000000 kernel: [ 55.507106] RBP: ffff8801ceaa1b28 R08: 0000000000017380 R09: ffffea0008419d80 kernel: [ 55.507142] R10: ffffffff81538f5a R11: 0000000000000002 R12: ffffffffa03273dc kernel: [ 55.507178] R13: ffffffffa03273dc R14: 0000000000000000 R15: ffffffffa03270a0 kernel: [ 55.507215] FS: 00007f72d564a740(0000) GS:ffff88021f380000(0000) knlGS:0000000000000000 kernel: [ 55.507256] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kernel: [ 55.507286] CR2: 0000000000000050 CR3: 00000001bd1f0000 CR4: 00000000001407e0 kernel: [ 55.507323] Stack: kernel: [ 55.507335] ffff8801ceaa1b28 ffffffffa0325cff ffff8801000001f4 ffff8801ceb44000 kernel: [ 55.507380] ffffffffa03273dc ffff8801ceb44000 ffff8801ceaa1b58 ffffffffa032688e kernel: [ 55.507426] ffff8801ceb44000 ffffffffa03274f0 ffffffffa03274f0 ffff8801ceb44380 kernel: [ 55.507471] Call Trace: kernel: [ 55.507490] [<ffffffffa0325cff>] ? sccb_w_array+0x3f/0x80 [gspca_ov534] kernel: [ 55.507527] [<ffffffffa032688e>] sd_start+0xce/0x2b0 [gspca_ov534] kernel: [ 55.507561] [<ffffffffa0326bf9>] sd_init+0x189/0x1e8 [gspca_ov534] kernel: [ 55.507596] [<ffffffffa02a0c95>] gspca_dev_probe2+0x285/0x410 [gspca_main] kernel: [ 55.507634] [<ffffffffa02a0e58>] gspca_dev_probe+0x38/0x60 [gspca_main] kernel: [ 55.507670] [<ffffffffa0325081>] sd_probe+0x21/0x30 [gspca_ov534] kernel: [ 55.507706] [<ffffffff8153c960>] usb_probe_interface+0x1c0/0x2f0 kernel: [ 55.507740] [<ffffffff8148758c>] really_probe+0x6c/0x330 kernel: [ 55.507771] [<ffffffff814879d7>] driver_probe_device+0x47/0xa0 kernel: [ 55.507803] [<ffffffff81487adb>] __driver_attach+0xab/0xb0 kernel: [ 55.507834] [<ffffffff81487a30>] ? driver_probe_device+0xa0/0xa0 kernel: [ 55.507867] [<ffffffff814857be>] bus_for_each_dev+0x5e/0x90 kernel: [ 55.507899] [<ffffffff8148714e>] driver_attach+0x1e/0x20 kernel: [ 55.507929] [<ffffffff81486bdc>] bus_add_driver+0x10c/0x290 kernel: [ 55.507961] [<ffffffff8148805d>] driver_register+0x7d/0x160 kernel: [ 55.507993] [<ffffffff8153b590>] usb_register_driver+0xa0/0x160 kernel: [ 55.508027] [<ffffffffa0067000>] ? 0xffffffffa0066fff kernel: [ 55.508056] [<ffffffffa006701e>] sd_driver_init+0x1e/0x1000 [gspca_ov534] kernel: [ 55.508094] [<ffffffff8100212a>] do_one_initcall+0xfa/0x1b0 kernel: [ 55.508126] [<ffffffff810578c3>] ? set_memory_nx+0x43/0x50 kernel: [ 55.508160] [<ffffffff81712e8d>] do_init_module+0x80/0x1d1 kernel: [ 55.508193] [<ffffffff810d2079>] load_module+0x4c9/0x5f0 kernel: [ 55.508223] [<ffffffff810cf7b0>] ? add_kallsyms+0x210/0x210 kernel: [ 55.508254] [<ffffffff810d2254>] SyS_init_module+0xb4/0x100 kernel: [ 55.508286] [<ffffffff817333ef>] tracesys+0xe1/0xe6 kernel: [ 55.508312] Code: a0 09 00 00 48 c7 c7 30 c3 3c a0 e8 7a 38 ca e0 eb cf 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb 48 83 ec 28 <8b> 47 50 83 e8 05 83 f8 02 77 09 80 b8 20 8c 3c a0 00 74 1d 48 kernel: [ 55.508559] RIP [<ffffffffa03c1b01>] v4l2_ctrl_g_ctrl+0x11/0x60 [videodev] kernel: [ 55.510605] RSP <ffff8801ceaa1af8> kernel: [ 55.512641] CR2: 0000000000000050 kernel: [ 55.525424] ---[ end trace 6786f15abfd2ac90 ]--- -- Regards, Yaroslav -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1173723 Title: 06f8:3002 BUG: unable to handle kernel NULL pointer dereference at 0000000000000050; RIP: 0010:[<ffffffffa046ada1>] [<ffffffffa046ada1>] v4l2_ctrl_g_ctrl+0x11/0x60 [videodev] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1173723/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs