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SubjectRe: USB SMP race in 2.4.11
On Wed, Oct 10, 2001, Oleg Drokin <green@linuxhacker.ru> wrote:
> I have caught kernel oops that is related to SMP race on usb modules
> deregistering.
> 2.4.10 was fine with the same setup.
> USB core is compiled-in, hub driver is uhci (as module).
> Here is the decoded oops:
>
> Unable to handle kernel paging request at virtual address d890c138
> c018f709
> *pde = 01662067
> Oops: 0000
> CPU: 1
> EIP: 0010:[<c018f709>] Not tainted
> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00010286
> eax: d890c12c ebx: c1664800 ecx: c1661ef4 edx: d71cff60
> esi: 00000064 edi: c1661ef0 ebp: c1660000 esp: c1661ee0
> ds: 0018 es: 0018 ss: 0018
> Process khubd (pid: 10, stackpage=c1661000)
> Stack: d71cff60 c018f7fb d71cff60 c1661f00 00000001 c1661f08 c1661f08 00000000
> 00000000 c1660000 c1661ef4 c1661ef4 c1664800 80000180 c160e720 c1661fbc
> c018f96f d71cff60 00000064 c1661f30 c1660000 c1661fbc c160e720 00000064
> Call Trace: [<c018f7fb>] [<c018f96f>] [<c018fa04>] [<c0191dbc>] [<c0192b7b>]
> [<c0192d95>] [<c0105000>] [<c0105656>] [<c0192d50>]
> Code: ff 50 0c 5a c3 89 f6 b8 ed ff ff ff c3 8d 76 00 8d bc 27 00
>
> >>EIP; c018f709 <usb_submit_urb+19/30> <=====
> Trace; c018f7fb <usb_start_wait_urb+8b/1a0>
> Trace; c018f96f <usb_internal_control_msg+5f/70>
> Trace; c018fa04 <usb_control_msg+84/a0>
> Trace; c0191dbc <usb_get_port_status+3c/40>
> Trace; c0192b7b <usb_hub_events+eb/2c0>
> Trace; c0192d95 <usb_hub_thread+45/a0>
> Trace; c0105000 <_stext+0/0>
> Trace; c0105656 <kernel_thread+26/30>
> Trace; c0192d50 <usb_hub_thread+0/a0>
> Code; c018f709 <usb_submit_urb+19/30>
> 00000000 <_EIP>:
> Code; c018f709 <usb_submit_urb+19/30> <=====
> 0: ff 50 0c call *0xc(%eax) <=====
> Code; c018f70c <usb_submit_urb+1c/30>
> 3: 5a pop %edx
> Code; c018f70d <usb_submit_urb+1d/30>
> 4: c3 ret
> Code; c018f70e <usb_submit_urb+1e/30>
> 5: 89 f6 mov %esi,%esi
> Code; c018f710 <usb_submit_urb+20/30>
> 7: b8 ed ff ff ff mov $0xffffffed,%eax
> Code; c018f715 <usb_submit_urb+25/30>
> c: c3 ret
> Code; c018f716 <usb_submit_urb+26/30>
> d: 8d 76 00 lea 0x0(%esi),%esi
> Code; c018f719 <usb_submit_urb+29/30>
> 10: 8d bc 27 00 00 00 00 lea 0x0(%edi,1),%edi
>
> It seems to die while dereferencing urb->dev->bus->op->submit_urb(urb),
> and urb->dev->bus->op pointer is bogus.
> Looking at the kernel messages, I have found that it dies at usb bus
> deregistering (when RedHat initscripts unload usb host controller driver
> for some reason).
> Here are the messages:
>
> uhci.c: USB Universal Host Controller Interface driver v1.1
> uhci.c: USB UHCI at I/O 0xc400, IRQ 19
> usb.c: new USB bus registered, assigned bus number 1
> usb: raced timeout, pipe 0x80000000 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000100 status 0 time left 0
> hub.c: USB hub found
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> hub.c: 2 ports detected
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000100 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000100 status 0 time left 0
> uhci.c: USB UHCI at I/O 0xc800, IRQ 19
> usb.c: new USB bus registered, assigned bus number 2
> usb: raced timeout, pipe 0x80000100 status 0 time left 0
> usb: raced timeout, pipe 0x80000100 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000000 status 0 time left 0
> usb: raced timeout, pipe 0x80000100 status 0 time left 0
> hub.c: USB new device connect on bus1/1, assigned device number 2
> usb.c: USB device 2 (vend/prod 0x49f/0x505a) is not claimed by any active driver.
> usb.c: registered new driver usbnet
> usb0: register usbnet 001/002, Linux Device
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000100 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000100 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000100 status 0 time left 0
> hub.c: USB hub found
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> hub.c: 2 ports detected
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000100 status 0 time left 0
> usb: raced timeout, pipe 0x80000180 status 0 time left 0
> usb: raced timeout, pipe 0x80000100 status 0 time left 0
> usb.c: USB disconnect on device 1
> usb.c: USB disconnect on device 2
> usb0: unregister usbnet 001/002, Linux Device
> usb.c: USB bus 1 deregistered
> usb.c: USB disconnect on device 1
> usb.c: USB bus 2 deregistered
> usb: raced timeout, pipe 0x80000100 status 0 time left 0
> Unable to handle kernel paging request at virtual address d890c138
> ...

Did you remove the uhci module?

This patch will fix the raced timeout messages, but you may have found a
reference counting bug as well.

JE

diff --minimal -Nru a/drivers/usb/uhci.c b/drivers/usb/uhci.c
--- a/drivers/usb/uhci.c Wed Oct 10 07:32:38 2001
+++ b/drivers/usb/uhci.c Wed Oct 10 07:32:38 2001
@@ -1594,9 +1594,7 @@
}

uhci_unlink_generic(uhci, urb);
- uhci_destroy_urb_priv(urb);
-
- usb_dec_dev_use(urb->dev);
+ uhci_call_completion(urb);

return ret;
}
-
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