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Date:      Thu, 7 Nov 2019 12:55:56 -0800
From:      Steve Kargl <sgk@troutmask.apl.washington.edu>
To:        Mark Johnston <markj@freebsd.org>
Cc:        freebsd-current@freebsd.org
Subject:   Re: unkillable process consuming 100% cpu
Message-ID:  <20191107205556.GA922@troutmask.apl.washington.edu>
In-Reply-To: <20191107203223.GF16978@raichu>
References:  <20191107202919.GA4565@troutmask.apl.washington.edu> <20191107203223.GF16978@raichu>

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On Thu, Nov 07, 2019 at 03:32:23PM -0500, Mark Johnston wrote:
> On Thu, Nov 07, 2019 at 12:29:19PM -0800, Steve Kargl wrote:
> > I haven't seen anyone post about an unkillable process
> > (even by root), which consumes 100% cpu.
> > 
> > last pid:  4592;  load averages:  1.24,  1.08,  0.74   up 13+20:21:20  12:26:29
> > 68 processes:  2 running, 66 sleeping
> > CPU:  0.1% user,  0.0% nice, 12.6% system,  0.0% interrupt, 87.2% idle
> > Mem: 428M Active, 11G Inact, 138M Laundry, 2497M Wired, 1525M Buf, 2377M Free
> > Swap: 16G Total, 24M Used, 16G Free
> > 
> >   PID USERNAME    THR PRI NICE   SIZE    RES STATE    C   TIME    WCPU COMMAND
> > 69092 kargl         2  45    0   342M   148M CPU2     2  12:51 100.07% chrome
> > 
> > 
> > Neither of these have an effect.
> > 
> > kill -1 69092
> > kill -9 69069
> > 
> > Attempts to attach gdb831 to -p 69092 leads to hung xterm.
> 
> Could you please show us the output of "procstat -kk 69092"?

Unfortunately, no.  I just rebooted the system to kill 69092.
During 'shutdown -r now', a message appeared on the console
warning that some processes would not die.  Then 'shutdown
-r now' hung the console. :(

Before rebooting I did try a number of ps and procstat commands, 69092 was

chrome: --type=gpu-process --field-trial-handle=long-string-of-number
        --gpu-preferences=long-string-with-IAs

So, it seems that drm-current-kmod may not be happy.

For the record, uname gives FreeBSD 13.0-CURRENT r353571



-- 
Steve



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