[linux-dvb] kernel panic when removing module while IR is active

[Markus Wiesner <list-dvb@subscription.wiesner-net.de>]

Hi!

I hope this is new, at least I could not find something related via
Google ... (a search in the linuxtv.org archive always returned "No
matches" no matter what I was looking for?!)

I'm using the onboard IR-receiver (J2) of a technotrend premium 1.6
dvb-s with the vanilla kernel 2.6.6 dvb-driver.

When the dvb_ttpci module is removed while the ir-receiver is receiving
data i always get following kernel oops (manually copied from screen,
may contain typos ...):

--- snip ---
Unable to handle kernel paging request at virtual address e0b69124
*pde = 1fe68067
*pte = 00000000
Oops: 0002 [#1]
PREEMPT
CPU:    0
EIP:    0060:[<c011fafc>]    Not tainted
EFLAGS: 00010012   (2.6.6)
EIP is at run_timer_softirq+0x7c/0x1ae
eax: c036ff40   ebx: c039e278   ecx: e0b69120   edx: e0b69120
esi: c036e000   edi: c039e270   ebp: c036ff40   esp: c036ff30
ds: 007b   es: 007b   ss: 0068
Process swapper (pid: 0, threadinfo=c036e000 task=c02fda40)
Stack: c011f8d8 00000001 c011fd17 c036ff40 c036ff40 c036ff40 c036ffa0 00000001
       c039dc28 0000000a c0366a00 c011bebe c039dc28 00000046 00000000 c0300224
       c011bee6 c036e000 c01063a2 00000000 c0366a00 00000001 c0300224 c036e000
Call Trace:
 [<c011f8d8>] update_wall_time+0xd/0x36
 [<c011fd17>] do_timer+0xdf/0xe4
 [<c011bebe>] __do_softirq+0x7e/0x80
 [<c011bee6>] do_softirq+0x26/0x28
 [<c01063a2>] do_IRQ+0x103/0x136
 [<c01048a0>] common_interrupt+0x18/0x20
 [<c02b007b>] xfrm6_update_pmtu+0x4/0x2e
 [<c0102041>] default_idle+0x23/0x26
 [<c010209f>] cpu_idle+0x2c/0x35
 [<c03706e4>] start_kernel+0x15d/0x17a
 [<c037044b>] unknown_bootoption+0x0/0x110

Code: 89 41 04 89 4c 24 10 8b 44 24 0c 89 02 89 50 04 89 5f 08 89
 <0>Kernel panic: Fatal exception in interrupt
In interrupt handler - not syncing
--- snip ---

There is no process reading from the event device. Only the kernel gets
the usual keyboard events.

Markus Wiesner


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