Re: Random server crashes every few weeks (smp_invltlb: endless loop […] retrysmp_invltlb: ipi sent)

[Matthew Dillon]

A fix for at least one indefinite wait buffer bug has gone into
master.(commit 10c39de26c1356d0).  It has not been put into the release
branch yet as it needs testing.  It's possible that this is related to the
bug you reported because the bug can occur when the system is paging
to/from swap while also reading and writing to the filesystem.  So, e.g.
any swap activity or paging during a buildworld or something like that.

-Matt

On Mon, Aug 8, 2016 at 7:32 PM, Matthew Dillon <dillon at backplane.com> wrote:

> Its likely another virtio bug.  We just haven't been able to test it very
> well.  I'll take a pass on it and see if I can find anything obvious.
>
> -Matt
>
> On Mon, Aug 8, 2016 at 12:02 PM, Stefan Unterweger <
> 232.20711 at chiffre.aleturo.com> wrote:
>
>>
>> * Matthew Dillon on Mon, Aug 08, 2016 at 11:08:40AM -0700:
>> > And (2) What is the device attachment for the swap drive (in the dmesg
>> > output).
>>
>> The swap drive is vbd1s0b, with the following attachment:
>> | virtio_pci2: <VirtIO PCI Block adapter> port 0xc040-0xc07f mem
>> 0xfebf1000-0xfebf1fff irq 10 at device 6.0 on pci0
>> | vtblk1: <VirtIO Block Adapter> on virtio_pci2
>> | virtio_pci2: host features: 0x710006d4 <EventIdx,RingIndirect,NotifyO
>> nEmpty,Topology,WriteCache,SCSICmds,BlockSize,DiskGeometry,MaxNumSegs>
>> | virtio_pci2: negotiated features: 0x10000254
>> <RingIndirect,WriteCache,BlockSize,DiskGeometry,MaxNumSegs>
>>
>> I have attached the full dmesg for reference.
>>
>> > Indefinite wait buffer typically means the disk driver locked up while
>> the
>> > system was trying to swap to/from it.  Two questions:  (1) Is the swap
>> > encrypted ?
>>
>> It is indeed encrypted.  We don’t want to trust the data center
>> operator, hence everything with the exception of /boot is encrypted.
>>
>> From fstab:
>> | /dev/part-by-uuid/3c563c78-c204-11e5-aff0-010000000000 none swap
>> sw,crypt 0 0
>>
>>
>>     Stefan
>>
>>
>> > On Mon, Aug 8, 2016 at 5:18 AM, Stefan Unterweger <
>> 232.20711 at chiffre.aleturo.com> wrote:
>> > > Another crash with 09b0c4f76, but this one looks different.  The
>> console
>> > > was scrolling endless streams of lines like this one:
>>
>> > > | swap_pager: indefinite wait buffer:  bp 0xffffffe00e57bea8 offset:
>> 4133535744, size: 4096
>>
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>
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