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Date: Fri, 2 Sep 2011 12:59:05 +0800 From: Dave Young <hidave.darkstar@...il.com> To: Sitsofe Wheeler <sitsofe@...oo.com> Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, Guennadi Liakhovetski <g.liakhovetski@....de>, Mauro Carvalho Chehab <mchehab@...radead.org> Subject: Re: BUG: unable to handle kernel paging request at 6b6b6bcb (v4l2_device_disconnect+0x11/0x30) On Fri, Sep 2, 2011 at 3:10 AM, Sitsofe Wheeler <sitsofe@...oo.com> wrote: > On Thu, Sep 01, 2011 at 05:02:51PM +0800, Dave Young wrote: >> On Tue, Aug 30, 2011 at 4:48 AM, Sitsofe Wheeler <sitsofe@...oo.com> wrote: >> > >> > I managed to produce an oops in 3.1.0-rc3-00270-g7a54f5e by unplugging a >> > USB webcam. See below: >> >> Could you try the attached patch? > > This patch fixed the oops but extending the sequence (enable camera, > start cheese, disable camera, watch cheese pause, enable camera, quit > cheese, start cheese) causes the following "poison overwritten" warning > to appear: It seems another bug, I can reproduce this as well. uvc_device is freed in uvc_delete, struct v4l2_device vdev is the member of struct uvc_device, so vdev is also freed. Later v4l2_device operations on vdev will overwrite the poison memory area. > > > [ 191.240695] uvcvideo: Found UVC 1.00 device CNF7129 (04f2:b071) > [ 191.277965] input: CNF7129 as /devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8:1.0/input/input9 > [ 220.287366] ============================================================================= > [ 220.287379] BUG kmalloc-512: Poison overwritten > [ 220.287384] ----------------------------------------------------------------------------- > [ 220.287387] > [ 220.287394] INFO: 0xec90f150-0xec90f150. First byte 0x6a instead of 0x6b > [ 220.287410] INFO: Allocated in uvc_probe+0x54/0xd50 age=210617 cpu=0 pid=16 > [ 220.287421] T.974+0x29d/0x5e0 > [ 220.287427] kmem_cache_alloc+0x167/0x180 > [ 220.287433] uvc_probe+0x54/0xd50 > [ 220.287441] usb_probe_interface+0xd5/0x1d0 > [ 220.287448] driver_probe_device+0x80/0x1a0 > [ 220.287455] __device_attach+0x41/0x50 > [ 220.287460] bus_for_each_drv+0x53/0x80 > [ 220.287466] device_attach+0x89/0xa0 > [ 220.287472] bus_probe_device+0x25/0x40 > [ 220.287478] device_add+0x5a9/0x660 > [ 220.287484] usb_set_configuration+0x562/0x670 > [ 220.287491] generic_probe+0x36/0x90 > [ 220.287497] usb_probe_device+0x24/0x50 > [ 220.287503] driver_probe_device+0x80/0x1a0 > [ 220.287509] __device_attach+0x41/0x50 > [ 220.287515] bus_for_each_drv+0x53/0x80 > [ 220.287522] INFO: Freed in uvc_delete+0xfe/0x110 age=22 cpu=0 pid=1645 > [ 220.287530] __slab_free+0x1f8/0x300 > [ 220.287536] kfree+0x100/0x140 > [ 220.287541] uvc_delete+0xfe/0x110 > [ 220.287547] uvc_release+0x25/0x30 > [ 220.287555] v4l2_device_release+0x9d/0xc0 > [ 220.287560] device_release+0x19/0x90 > [ 220.287567] kobject_release+0x3c/0x90 > [ 220.287573] kref_put+0x2c/0x60 > [ 220.287578] kobject_put+0x1d/0x50 > [ 220.287587] put_device+0xf/0x20 > [ 220.287593] v4l2_release+0x56/0x60 > [ 220.287599] fput+0xcc/0x220 > [ 220.287605] filp_close+0x44/0x70 > [ 220.287613] put_files_struct+0x158/0x180 > [ 220.287619] exit_files+0x40/0x50 > [ 220.287626] do_exit+0xec/0x660 > [ 220.287632] INFO: Slab 0xef722180 objects=23 used=23 fp=0x (null) flags=0x4080 > [ 220.287639] INFO: Object 0xec90f060 @offset=12384 fp=0xec90cac0 > [ 220.287642] > [ 220.287647] Bytes b4 0xec90f050: 6d 06 00 00 88 c8 fe ff 5a 5a 5a 5a 5a 5a 5a 5a m....ÈþÿZZZZZZZZ > [ 220.287681] Object 0xec90f060: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.287713] Object 0xec90f070: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.287746] Object 0xec90f080: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.287778] Object 0xec90f090: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.287811] Object 0xec90f0a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.287843] Object 0xec90f0b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.287876] Object 0xec90f0c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.287908] Object 0xec90f0d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.287941] Object 0xec90f0e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.287973] Object 0xec90f0f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288006] Object 0xec90f100: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f110: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f120: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f130: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f140: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f150: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b jkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f160: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f170: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f180: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f190: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f1a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f1b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f1c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f1d0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f1e0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f1f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f200: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f210: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f220: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f230: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f240: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 220.288012] Object 0xec90f250: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk¥ > [ 220.288012] Redzone 0xec90f260: bb bb bb bb »»»» > [ 220.288012] Padding 0xec90f308: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ > [ 220.288012] Pid: 1450, comm: metacity Not tainted 3.1.0-rc4-00131-g9e79e3e-dirty #488 > [ 220.288012] Call Trace: > [ 220.288012] [<b0192c3e>] print_trailer+0xee/0x140 > [ 220.288012] [<b0193157>] check_bytes_and_report+0xd7/0x160 > [ 220.288012] [<b0194a98>] check_object+0x1d8/0x220 > [ 220.288012] [<b0192fe3>] ? check_slab+0x63/0x100 > [ 220.288012] [<b0194f67>] alloc_debug_processing+0xb7/0x130 > [ 220.288012] [<b019602d>] T.974+0x29d/0x5e0 > [ 220.288012] [<b044c466>] ? sock_alloc_send_pskb+0x176/0x290 > [ 220.288012] [<b044c466>] ? sock_alloc_send_pskb+0x176/0x290 > [ 220.288012] [<b0198551>] ? create_object+0x191/0x240 > [ 220.288012] [<b01979f5>] __kmalloc_track_caller+0x1d5/0x1f0 > [ 220.288012] [<b044c466>] ? sock_alloc_send_pskb+0x176/0x290 > [ 220.288012] [<b044ff2d>] __alloc_skb+0x4d/0x140 > [ 220.288012] [<b044c466>] sock_alloc_send_pskb+0x176/0x290 > [ 220.288012] [<b055d98a>] ? __mutex_unlock_slowpath+0x9a/0x110 > [ 220.288012] [<b044c598>] sock_alloc_send_skb+0x18/0x20 > [ 220.288012] [<b04b7957>] unix_stream_sendmsg+0x2b7/0x3d0 > [ 220.288012] [<b0448913>] sock_aio_write+0x133/0x170 > [ 220.288012] [<b019b285>] do_sync_readv_writev+0x95/0xc0 > [ 220.288012] [<b0274328>] ? _copy_from_user+0x38/0x180 > [ 220.288012] [<b019b133>] ? rw_copy_check_uvector+0x73/0xf0 > [ 220.288012] [<b019bf1b>] do_readv_writev+0x9b/0x180 > [ 220.288012] [<b04487e0>] ? sock_destroy_inode+0x30/0x30 > [ 220.288012] [<b019c562>] ? fget_light+0xb2/0x130 > [ 220.288012] [<b019c576>] ? fget_light+0xc6/0x130 > [ 220.288012] [<b019c045>] vfs_writev+0x45/0x60 > [ 220.288012] [<b019c131>] sys_writev+0x41/0x80 > [ 220.288012] [<b055ff57>] sysenter_do_call+0x12/0x36 > [ 220.288012] [<b0550000>] ? rfkill_alloc+0xe0/0x110 > [ 220.288012] FIX kmalloc-512: Restoring 0xec90f150-0xec90f150=0x6b > [ 220.288012] > [ 220.288012] FIX kmalloc-512: Marking all objects used > > -- > Sitsofe | http://sucs.org/~sits/ > -- Regards Yang RuiRui -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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