Re: CURRENT [r308668] autofs kernel panic

Hello Edward,

Thank you for the quick reply!
I was able to reproduce this panic on default GENERIC kernel (my test
system and laptop):

# kgdb /boot/kernel/kernel /var/crash/vmcore.2
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Unread portion of the kernel message buffer:
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
cpuid = 3; apic id = 06
fault virtual address = 0xe0
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff809fe487
stack pointer        = 0x28:0xfffffe085f5d4560
frame pointer        = 0x28:0xfffffe085f5d45b0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = resume, IOPL = 0
current process = 0 (pkg)

kgdb: kvm_read: invalid address (0xffff)
Reading symbols from /boot/kernel/zfs.ko...Reading symbols from
/usr/lib/debug//boot/kernel/zfs.ko.debug...done.
done.
Loaded symbols for /boot/kernel/zfs.ko
Reading symbols from /boot/kernel/opensolaris.ko...Reading symbols
from /usr/lib/debug//boot/kernel/opensolaris.ko.debug...done.
done.
Loaded symbols for /boot/kernel/opensolaris.ko
Reading symbols from /boot/kernel/ums.ko...Reading symbols from
/usr/lib/debug//boot/kernel/ums.ko.debug...done.
done.
Loaded symbols for /boot/kernel/ums.ko
Reading symbols from /boot/kernel/autofs.ko...Reading symbols from
/usr/lib/debug//boot/kernel/autofs.ko.debug...done.
done.
Loaded symbols for /boot/kernel/autofs.ko
#0  0x0000000000000000 in ?? ()
(kgdb)


(kgdb) bt
#0  0x0000000000000000 in ?? ()
Cannot access memory at address 0x0
(kgdb)

Please take a look attached file. Let me know how I can assist further.

Thank you!

2016-11-15 19:31 GMT+03:00 Edward Tomasz Napierała <trasz_at_freebsd.org>:
> On 1115T1016, Alex Deiter wrote:
>> Hello,
>>
>> FreeBSD 12.0-CURRENT-r308668 amd64 crashed on "pkg install” command:
>>
>> # cat /usr/local/etc/pkg/repos/local.conf
>> local: {
>> url: "file:///net/nostromo/var/devel/pkg",
>> enabled: yes
>> }
>>
>> Path /net/nostromo/var/devel/pkg accessible via autofs/automountd:
>>
>> # ls /net/nostromo/var/devel/pkg
>> All Latest digests.txz meta.txz packagesite.txz
>>
>> # mount -t nfs
>> nostromo:/var/devel/pkg on /net/nostromo/var/devel/pkg (nfs, nosuid,
>> automounted)
>>
>> # kgdb /usr/lib/debug/boot/kernel/kernel.debug /var/crash/vmcore.0
>> ...
>> Unread portion of the kernel message buffer:
>> kernel trap 12 with interrupts disabled
>>
>>
>> Fatal trap 12: page fault while in kernel mode
>> cpuid = 0; apic id = 00
>> fault virtual address = 0x100df
>> fault code = supervisor read data, page not present
>> instruction pointer = 0x20:0xffffffff8063c88d
>> stack pointer         = 0x28:0xfffffe085f966520
>> frame pointer         = 0x28:0xfffffe085f966570
>> code segment = base 0x0, limit 0xfffff, type 0x1b
>> = DPL 0, pres 1, long 1, def32 0, gran 1
>> processor eflags = resume, IOPL = 0
>> current process = -134214453 (pkg)
>>
>> kgdb: kvm_read: invalid address (0x6c6576656c6572)
>> kgdb: kvm_read: invalid address (0xf8000ce021d8ffff)
>> #0  0x0000000000000000 in ?? ()
>> (kgdb) list *0xffffffff8063c88d
>> 0xffffffff8063c88d is in hardclock_cnt (/usr/src/sys/kern/kern_clock.c:568).
>
> [..]
>
> It looks a bit weird - the "kvm_read" errors, and also the one-function
> traceback that contains only one function, that seems unrelated to autofs.
> Are you sure you're using the right kernel?  Could you try the usual
>
> kgdb /boot/kernel/kernel /var/crash/vmcore.0
>
> instead?  Thanks!
>



-- 
Alex Deiter