On Fri, 1 Jun 2007, Andrew Morton wrote:
> > I'm using vanilla kernel 2.6.22-rc3 (and I try'ed with 2.6.21-fc7 fedora
> > kernel) with a huawei e220 3g, and when I open amule after sometime kernel
> > panics:
> > _
> > list_add corruption. prev->next should be next (f7d28794), but was f0df8ed4
> > (prev=f0df8ed4)
> > Kernel Bug at lib/list_debug.c:33
> > CPU: 0
> > EIP: 0060:[<c04ddda5>] Not tainted VLI
> > EFLAGS: 00010092 (2.6.22_rc3 #1)
> > EIP is at __list_add+0x48/0x5c
> > eax: 00000061___ebx: f0df8ed4___ecx: c06ced10___edx:00000086
> > esi: f0df8ed4___edi: 00000246___ebp: f7d28788___esp: c0750e68
> > ds: 007b________es: 007b________fs: 00d8________gs: 0033________ss: 0068
> > Process Amule (pid: 9719, ti=c0750000 task=d1da38b0 task.ti=c7899000)
> > Satck:
> > _co69461e________f7d28794________f0df8ed4________f0df8ed4________f0df8ec0________ffffffff________c0558f09________
> > 00000040
> > ________00000021________f9316564________c180a120________00000000________d4884800________00000020________f7ece200________000000fc
> > ________f7a45000________db1c8000________00000001________00000040________f90b8da0________f7a45000________d3740000________c409e470
> > Call Trace:
> > ________[<c0558f09>] usb_hcd_sumit_urb+0x9a/0x778
> > ________[<f9316564>] ppp_async_push+0x38c/0x398 [ppp_async]
> Could be a ppp bug, more likely a USB bug, but that's a well-tested code
> path.
>
> Greg? Anyone? ANy idea where to start looking?
Maybe the serial device driver is submitting an URB that is already in
use. This patch might catch the error.
Alan Stern
Index: usb-2.6/drivers/usb/core/urb.c
===================================================================
--- usb-2.6.orig/drivers/usb/core/urb.c
+++ usb-2.6/drivers/usb/core/urb.c
@@ -233,6 +233,12 @@ int usb_submit_urb(struct urb *urb, gfp_
|| dev->state == USB_STATE_SUSPENDED)
return -EHOSTUNREACH;
+ /* Not a precise test, but useful for debugging */
+ if (urb->status == -EINPROGRESS) {
+ WARN_ON(1);
+ return -EBUSY;
+ }
+
urb->status = -EINPROGRESS;
urb->actual_length = 0;
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