Re: crash while switching vts between x and console
rob wrote:
> Matthew Dillon wrote:
>
>>
>> : dumped core - see /var/crash/vmcore.0
>> :
>> :Sun Oct 31 00:39:05 PDT 2010
>> :
>> :Version String: DragonFly v2.9.0.89.gcd3c6-DEVELOPMENT #2: Sat Oct 30
>> :14:14:38 PDT 2010 root@:/usr/obj/usr/src/sys/EAGLE
>> :
>> :panic: assertion: gd->gd_spinlocks_wr == 0 in bsd4_schedulerclock
>> :...
>> :exchange_scr(c05674a0,fffffffd,20007604,cec3f880,d22b8b80) at
>> :exchange_scr+0x138
>> :finish_vt_rel(d22b8c18,7,c064a7a0,c286ca98,c02bc049) at
>> :finish_vt_rel+0x55 scioctl(d22b8b8c,c05619a8,cecf3110,20007604,d22b8c18)
>> :at scioctl+0xae5 dev_dioctl(cecf3110,20007604,d22b8c18,7,cc850620) at
>> :dev_dioctl+0xb0
>> :devfs_fo_ioctl(cc8737f0,20007604,d22b8c18,cc850620,d22b8cf0) at
>>
>> Try removing the crit_exit/crit_enter in do_switch_scr().
>>
>> /usr/src/sys/dev/misc/syscons/syscons.c line ~2540
>>
>> static void
>> do_switch_scr(sc_softc_t *sc)
>> {
>> lwkt_gettoken(&tty_token);
>> vt_proc_alive(sc->new_scp);
>>
>> crit_exit(); <--- remove
>> exchange_scr(sc); (keep)
>> crit_enter(); <--- remove
>> /* sc->cur_scp == sc->new_scp
>>
>> -Matt
> this appears to help in 32bit mode.. I will try it in 64 bit mode which
> currently crashes everytime I change from X to a vty
>
> RG
I can confirm that this fixes the issue as well as apperantly a spurious
issue that I was having with pressing the scoll lock key during dmesg
causing a panic that did not result in dropping core or going to the
debugger.
In short:
386 up works now
386 SMP works now
X86_64 up works now
X86_64 SMP works now
before when switching back and forth between vts and X you would get a panic
frequently but not always under 386 up/ and smp
with X86_64 up and xmp it was always.. i.e. every time you tried it would
panic.
It does this no longer .
RG
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