Messages in this thread | | | Date | Fri, 20 Oct 2006 13:44:09 +0200 | From | Helge Hafting <> | Subject | Re: [linux-usb-devel] 2.6.19-rc1-mm1 - locks when using "dd bs=1M" from card reader |
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Alan Stern wrote: [...] > After looking at the debugging output, no. That "invalid opcode" is a red > herring. What you encountered this time was a BUG() in the source code of > start_unlink_async() in drivers/usb/host/ehci-q.c: > > #ifdef DEBUG > assert_spin_locked(&ehci->lock); > if (ehci->reclaim > || (qh->qh_state != QH_STATE_LINKED > && qh->qh_state != QH_STATE_UNLINK_WAIT) > ) > BUG (); > #endif > > You could try putting a printk() just before the BUG() to display the > values of ehci->reclaim and qh->qh_state. Maybe also change the BUG() to > ehci->reclaim=0 qh->qh_state=5 > WARN(), which might help prevent your system from crashing so badly. > WARN didn't help much. I then got the warning twice, followed by another BUG: process klogd ehci_irq usb_hcd_irq handle_IRQ_event handle_fasteio_irq do_IRQ
So I set it back to BUG. Crashing hard isn't so bad when I know what is coming - I simply remount everything synchronously before trying.
I hope these printk's help. I can add more of them too, if needed. Big transfers seems to bring out the worst - I always get the crash on the first megabyte now.
During boot I get lots of those "Hardware error, end-of-data detected" messages, but I've never seen it crash during bootup.
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