Re: kernel fault -current of 23/24 Apr 2015

[Paul Goyette <paul%vps1.whooppee.com@localhost>]

On Fri, 24 Apr 2015, bch wrote:

> Fyi, running "bt" in the debugger yields (transcribed BY HAND):
>
> db{0}> bt
> breakpoint() at netbsd:breakpoint+0x5
> vpanic() at netbsd:vpanic+0x13c
> snprintf() at netbsd:snprintf
> lockdebug_abort() at netbsd:locdebug_abort+0x63
> mutex_vector_enter() at netbsd:mutex_vector_enter+0x531
> sysmon_evnsys_register() at netbsd:sysmon_evnsys_register+0x41
> acpiacad_attach() at netbsd:acpiacad_attach+0xcd
> config_attach_loc() at netbsd:config_attach_loc+0x17a
> acpi_rescan() at netbsd:acpi_rescan+0x20d
> acpi_attach() at netbsd:acpi_attach+0x2f1
> config_attach_loc() at netbsd:config_attach_loc+0x17a
> mainbus_attach() at netbsd:mainbus_attach+0x2a6
> config_attach_loc() at netbsd:config_attach_loc+0x17a
> cpu_configure() atnetbsd:cpu_configure+0x26
> main() at netbsd:main+0x29e

Very odd....

For some reason, the sme_global_mtx seems to already be locked when 
sysmon_envsys_register tries to get it.  Code examination shows that 
there is one error path where the mutex is not released, and I just 
committed a fix for that.  It is unlikely, though, that this is why you 
two are having problems, as this code path would not (or, at least, 
should not) have changed from the modularization changes.

Brad, do you have the dmesg output leading up to the panic?  Wiz already 
provided his.

> On 4/24/15, bch <brad.harder%gmail.com@localhost> wrote:
> > Transcribed boot msgs:
> >
> > Mutex error: mutex_vector_enter: locking against myself
> >
> > lock address : 0xffffffff811bc040
> > current cpu   :                           0
> > current lwp   : 0xffffffff810cebc0
> > owner field   : 0xffffffff810cebc0 wait/spin:    0/0
> >
> > panic: lock error: Mutex: mutex_vector_enter: locking against myself:
> > lock 0xffffffff811bc040 cpu 0 lwp 0xffffffff810cebc0
> > fatal breakpoint trap in supervisor mode
> > trap type 1 code 0 rip ffffffff80289eed cs 8 rflags 246 cr2 0 ilevel 8
> > rsp ffffffff8137fab0
> > curlwp 0xffffffff810cebc0 pid 0.1 lowest kstack 0xffffffff8137c2c0
> > Stopped in pid 0.1 (system) at netbsd:breakpoint+0x5: leave

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