Re: [Libusb-devel] Kernel bug message and missing data on libusb_interrupt_transfer

[Oncaphillis]

On 04/04/2011 03:31 PM, Oncaphillis wrote:
>    Thanks for the reply.
>
> I'm in an environment where we are
> reluctant to switch between versions. I had a hard time to
> argue for 0.1.x to 1.0.x transition. We saw the same bug (or at least
> kernel freezes in 0.1.x) I'll give 1.0.8 a try and report back.
>    Using a git pull isn't an option for us for political reasons.
>
> Thanks
>
> O.
>
>
> On 04/04/2011 03:06 PM, Xiaofan Chen wrote:
> > On Mon, Apr 4, 2011 at 8:14 PM, Oncaphillis<oncaphillis@xxxxxxxx>   wrote:
> > > Hi,
> > >
> > >    We are experiencing sporadic kernel bug messages and total
> > > kernel freezes on usb communication via libusb-1.0.6.
> > First thing first, why not try the latest release version which
> > is libusb-1.08?
> >
> > Or better yet, try the latest git from libusb-stuge branch
> > which has quite some fixes post 1.08.
> > http://git.libusb.org/?p=libusb-stuge.git;a=summary;js=1
Ok -- tried libusb 1.0.8.

Now I get

<snip>
------------[ cut here ]------------
kernel BUG at mm/slub.c:2808!
invalid opcode: 0000 [#2] SMP
last sysfs file: 
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-3/bConfigurationValue
CPU 1
Modules linked in:
Pid: 14293, comm: E25Stress Tainted: G      D    2.6.30.10 #2 To Be 
Filled By O.E.M.
RIP: 0010:[<ffffffff8028d2f8>]  [<ffffffff8028d2f8>] kfree+0x7c/0xdb
RSP: 0000:ffff88007847fb98  EFLAGS: 00010246
RAX: 4000000000000000 RBX: ffff880077c4a772 RCX: 0000000009f110a0
RDX: ffffe20000000000 RSI: ffffe20001a33030 RDI: ffff880077c4a772
RBP: ffff88007847fbb8 R08: ffff8800650dda40 R09: 00000000ffe1caa8
R10: ffff88007847e000 R11: 0000000000000000 R12: ffff88007b43fe40
R13: ffffffff80523871 R14: 0000000009f11080 R15: 00000000ffe1ca90
FS:  0000000000000000(0000) GS:ffff880001029000(0063) knlGS:00000000558356d0
CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b
CR2: 0000000055577000 CR3: 000000007842c000 CR4: 00000000000406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process E25Stress (pid: 14293, threadinfo ffff88007847e000, task 
ffff88007b46cec0)
Stack:
 ffffffff8029ee80 ffff88007b389e40 ffff88007b43fe40 ffff88007b389e40
 ffff88007847fbd8 ffffffff80523871 0000000000000000 ffff87fffffffffd
 ffff88007847fc18 ffffffff80523eee 0000000000200200 00000000ffffffff
Call Trace:
 [<ffffffff8029ee80>] ? __pollwait+0x0/0xbf
 [<ffffffff80523871>] free_async+0x22/0x47
 [<ffffffff80523eee>] processcompl_compat+0xe3/0x108
 [<ffffffff8052611f>] usbdev_ioctl+0x114f/0x157d
 [<ffffffff8029a046>] ? __link_path_walk+0x130/0xc32
 [<ffffffff802299e6>] ? dequeue_task_fair+0x13e/0x14d
 [<ffffffff80209b30>] ? __switch_to+0x13d/0x269
 [<ffffffff8029ce8e>] vfs_ioctl+0x6a/0x82
 [<ffffffff8029d2be>] do_vfs_ioctl+0x418/0x459
 [<ffffffff80246a12>] ? hrtimer_try_to_cancel+0x67/0x72
 [<ffffffff8029d341>] sys_ioctl+0x42/0x65
 [<ffffffff802c2cfd>] do_ioctl32_pointer+0xb/0xd
 [<ffffffff802c4790>] compat_sys_ioctl+0x2fa/0x34a
 [<ffffffff8029ddac>] ? poll_select_set_timeout+0x61/0x7c
 [<ffffffff80225602>] ia32_sysret+0x0/0xa
Code: ba 00 00 00 00 00 e2 ff ff 48 c1 e8 0c 48 6b f0 38 48 01 d6 66 83 
3e 00 79 04 48 8b 76 10 48 8b 06 84 c0 78 14 66 a9 00 c0 75 04 <0f> 0b 
eb fe 48 89 f7 e8 35 13 fe ff eb 48 48 8b 4d 08 48 8b 7e
RIP  [<ffffffff8028d2f8>] kfree+0x7c/0xdb
 RSP <ffff88007847fb98>
---[ end trace 840ffcb16d410ea4 ]---
</snip>

Suprisingly now the kernel is reported as tainted although there isn't 
any module inserted the
The timing seems to be the same as can be seen under 
http://oncaphillis.net/usb.pdf
but now we actually read data, but it's not the #72A7 sequence we are 
expecting.

Thanks
O.


> > >    We are currently under kernel 2.6.30.10 but have seen
> > > it also under older and newer kernel (I think the newest was
> > > a 2.6.36.x).
>
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