FreeBSD 10.1 crashing under load

[Christian Kujau]

On Thu, 12 Feb 2015 at 00:41, Christian Kujau wrote:
> Hi,
> 
> I have a Lenovo Ideapad S10 netbook running FreeBSD 10.1-p5 and 
> ever since I switched from Linux Fedora to FreeBSD the system crashes 
> regularly when the system is under a bit of load :-\
> 
> This netbook is operated in a headless mode, so I'm not using Wifi, 
> Bluetooth or other fancy hardware features this netbook might have, only 
> the system's disk and ethernet.
> 
> I've put a few more details below, but what I wanted to ask is: are there 
> any flags to set in FreeBSD so that it's more chatty when it crashes? 
> Right now the system just reboots but leaves nothing in the system log as 
> to _why_ it crashed. I've configured a crash dump device as per [0] but no 
> crash dump is ever taken. I'm running with encrypted swap (via GELI), 
> maybe crashdumping doesn't work with encrypted swap?
> 
> I tried to set ddb_enable=YES in rc.conf but the standard kernel doesn't 
> appear to have debugging enabled:
> 
> # /etc/rc.d/ddb start
> /etc/rc.d/ddb: WARNING: failed precmd routine for ddb
> 
> # sysctl debug.ddb.scripting.scripts
> sysctl: unknown oid 'debug.ddb.scripting.scripts': No such file or directory
> 
> I don't have a serial console for this machine.
> 
> Does anybody have any hints to to debug this thing? I haven't touched any 
> boot parameters yet, anybody got a hint which knob to turn there?

...anyone?


> 
> Thanks,
> Christian.
> 
> [0] https://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug.html
> 
> $ kldstat 
> Id Refs Address    Size     Name
>  1   28 0xc0400000 13a367c  kernel
>  2    1 0xc606c000 12000    geom_eli.ko
>  3    1 0xc607f000 22000    crypto.ko
>  4    1 0xc5f7b000 4000     fdescfs.ko
>  5    1 0xc628a000 8000     linprocfs.ko
>  6    2 0xc629e000 4a000    linux.ko
>  7    1 0xc6298000 3000     linsysfs.ko
>  8    1 0xc61b9000 2000     blank_saver.ko
>  9    1 0xc68c4000 5000     nullfs.ko
> 
> The only "exotic" part here is the enabled Linux compatibility: I'm 
> running a (headless) sysutils/linux-crashplan installation on this system 
> but for some reason it's not running with a native FreeBSD JRE but needs 
> java/linux-sun-jre17 to work.
> 
> When running, this spawns some ~40 java processes that can be quite
> active on both CPU and network & disk I/O. It uses a lot of memory too
> and the machine does only have 1GB of physical memory (+1GB swap) but even
> if the application would use too much memory I'd expect the application to
> crash, not the whole system. The following is from "top -b" right before
> the machine crashed:
> 
> ===================================================================
> 97 processes:  1 running, 96 sleeping
> Mem: 57M Active, 630M Inact, 281M Wired, 3104K Cache, 176M Buf, 6808K Free
> Swap: 1024M Total, 92M Used, 932M Free, 8% Inuse
> 
>   PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME    WCPU 
> COMMAND
> 91068 crashplan     1  52   19  1179M 69228K biord   0   0:21  36.18% java
> 24505 crashplan     1  40   19  1179M 69228K futex   1  11:13   0.78% java
> 24509 crashplan     1  40   19  1179M 69228K futex   0   0:10   0.49% java
> 40623 crashplan     1  39   19  1179M 69228K futex   1 179:40   0.00% java
>  5750 chrisk        1  20    0 15144K  2744K select  0  39:18   0.00% screen
>  5764 root          1  52    0 11048K  1276K wait    0  35:42   0.00% bash
> ===================================================================
> 
> 
> 
> -- 
> BOFH excuse #236:
> 
> Fanout dropping voltage too much, try cutting some of those little traces
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> 

-- 
BOFH excuse #11:

magnetic interference from money/credit cards