Re: kern/53005: apache httpd can hang the system

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Mon, Feb 12, 2018 at 03:40:38PM +0900, clare%csel.org@localhost wrote:
> >  When it hangs, can you enter ddb and get a backtrace of the apache process ?
> 
> db{0}> bt
> breakpoint() at netbsd:breakpoint+0x5
> wskbd_translate() at netbsd:wskbd_translate+0xbb4
> wskbd_input() at netbsd:wskbd_input+0x5b
> pckbd_input() at netbsd:pckbd_input+0x6b
> pckbcintr() at netbsd:pckbcintr+0x8d
> intr_bloglock_wrapper() at netbsd:intr_biglock_wrapper+0x1d
> Xintr_ioapic_edge4() at netbsd:Xintr_ioapic_edge4+0xf1
> --- interrupt ---
> exit_lwps() at netbsd:exit_lwps+0x58
> exit1() at netbsd:exit1+0x68
> sys_exit() at netbsd:sys_eit+0x3d
> syscall() at netbsd:syscall+0x1d8
> --- syscall (number 1) ---
> 
> db{0}> trace/t 50
> trace: pid 80 lid 40 at 0xffff80002a503db0
> ?() at ffffe4001fa3b5c0
> lwp_exit_switchaway() at netbsd:lwp_exit_switchaway+0x1ac
> Bad frame pointer: 0xffffe4001a1c8300

Do you want to backtrace pid 50 (decimal) or 80 (decimal) ?
if you want to trace pid 50, you have to use:
trace/t 0t50
(numbers are interpreted as hex by default).

Also it would be interesting to see which pid was interupted by entering ddb.
I wonder if it's stuck looping in exit_lwps()

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--