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List:       freebsd-multimedia
Subject:    Re: webcamd-4.12.0.1 segfault when using WinTV-HV-950Q
From:       Lucas Young <youngluc () gmail ! com>
Date:       2017-12-17 13:33:35
Message-ID: CAP0m9o3zYO3D6qxmnx9QWaTE=Zh1HuNwfjDO4e3UV+fSGkw52g () mail ! gmail ! com
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On Sun, Dec 17, 2017 at 3:40 AM, Hans Petter Selasky <hps@selasky.org> wrote:
> On 12/17/17 04:03, Lucas Young wrote:
>>
>> #0  0x0000000000415262 in timer_exec (arg=0x0) at kernel/linux_timer.c:142
>> 142                                     TAILQ_REMOVE(&timer_head, t,
>> entry);
>> (gdb) bt
>> #0  0x0000000000415262 in timer_exec (arg=0x0) at kernel/linux_timer.c:142
>> #1  0x00000008014cfbc5 in pthread_create () from /lib/libthr.so.3
>> #2  0x0000000000000000 in ?? ()
>> Current language:  auto; currently minimal
>> (gdb) p &timer_head
>> $1 = (struct timer_head *) 0xc32bf8
>> (gdb) p t
>> $2 = (struct timer_list *) 0x802843130
>
>
> Instead of dumping &timer_head, can you dump "timer_head" and the tree of
> elements that follow?
>
> p timer_head
>
> p *t
>
> --HPS


I sure can. Here is the output:
#0  0x0000000000415262 in timer_exec (arg=0x0) at kernel/linux_timer.c:142
142                                     TAILQ_REMOVE(&timer_head, t, entry);
(gdb) set print pretty on
Current language:  auto; currently minimal
(gdb) bt
#0  0x0000000000415262 in timer_exec (arg=0x0) at kernel/linux_timer.c:142
#1  0x00000008014cfbc5 in pthread_create () from /lib/libthr.so.3
#2  0x0000000000000000 in ?? ()
(gdb) p &timer_head
$1 = (struct timer_head *) 0xc32bf8
(gdb) p timer_head
$2 = {
  tqh_first = 0x802843078,
  tqh_last = 0x802843130
}
(gdb) p t
$3 = (struct timer_list *) 0x802843130
(gdb) p *t
$4 = {
  entry = {
    tqe_next = 0x802843130,
    tqe_prev = 0x0
  },
  function = 0x413260 <delayed_work_timer_fn>,
  expires = 4494,
  data = 34401956120
}
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