Re: kern/45718 (processes sometimes get stuck and spin in vm_map)

[rudolf <netbsd%eq.cz@localhost>]

The following reply was made to PR kern/45718; it has been noted by GNATS.

From: rudolf <netbsd%eq.cz@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/45718 (processes sometimes get stuck and spin in vm_map)
Date: Fri, 24 Feb 2012 15:48:22 +0100

 I've recently observerd the same phenomenon.
 
 "ps /l" in DDB revealed 4 lwps stuck in vm_map: xulrunner-bin, ksh, 
 login, cron.
 
 "bt /a <lwp>" for xulrunner-bin:
 sleepq_block
 cv_timedwait
 uvm_map_prepare
 uvm_map
 uvm_km_alloc
 uarea_poolpage_alloc
 pool_allocator_alloc
 pool_grow
 poop_get
 poop_cache_get_slow
 pool_cache_get_paddr
 uvm_uarea_alloc
 sys__lwp_create
 sy_call
 syscall
 
 "bt /a <lwp>" for the other three lwps looked the same, with "fork1, 
 sys_fork" instead of the "sys_lwp_create". Unfortunately, I've not 
 collected the "show uvm", maybe next time.
 
 My environment: i386 with netbsd-5 userland and netbsd-6 MONOLITHIC 
 kernel updated 2012/02/22, with PAE, 8 GB RAM.
 
 r.