Re: PR/46153 CVS commit: src/sys/kern

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

The following reply was made to PR kern/46153; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: martin%NetBSD.org@localhost, gnats-admin%NetBSD.org@localhost, 
netbsd-bugs%NetBSD.org@localhost
Subject: Re: PR/46153 CVS commit: src/sys/kern
Date: Sat, 10 Mar 2012 14:39:27 +0100

 On Sat, Mar 10, 2012 at 08:50:04AM +0000, Martin Husemann wrote:
 > The following reply was made to PR kern/46153; it has been noted by GNATS.
 > 
 > From: "Martin Husemann" <martin%netbsd.org@localhost>
 > To: gnats-bugs%gnats.NetBSD.org@localhost
 > Cc: 
 > Subject: PR/46153 CVS commit: src/sys/kern
 > Date: Sat, 10 Mar 2012 08:46:46 +0000
 > 
 >  Module Name:        src
 >  Committed By:       martin
 >  Date:               Sat Mar 10 08:46:46 UTC 2012
 >  
 >  Modified Files:
 >      src/sys/kern: kern_exec.c
 >  
 >  Log Message:
 >  Make sure the child of a posix_spawn operation is not preempted during
 >  the times when it does not have any vm_space.
 >  Should fix PR kern/46153.
 
 Unfortunably, with an up to date kernel:
      $NetBSD: kern_exec.c,v 1.345 2012/03/10 08:46:45 martin Exp $
 I'm still seeing the problem:
 Stopped in pid 25188.1 (t_fileactions) at       netbsd:pmap_deactivate+0x93:   
 movq     0(%rax),%rbx
 db{2}> sh reg
 ds          2400
 es          811e
 fs          7ab0
 gs          811e
 rdi         fffffe8185b02800
 rsi         0
 rbp         fffffe810cc17b00
 rbx         fffffe8185b02800
 rdx         0
 rcx         c
 rax         0
 r8          ffff80000e1965c0
 r9          1
 r10         2
 r11         0
 r12         ffff80000e1965c0
 r13         fffffe81bdc82400
 r14         0
 r15         7
 rip         ffffffff80610c3e    pmap_deactivate+0x93
 cs          8
 rflags      10246
 rsp         fffffe810cc17ae0
 ss          10
 netbsd:pmap_deactivate+0x93:    movq    0(%rax),%rbx
 db{2}> tr
 pmap_deactivate() at netbsd:pmap_deactivate+0x93
 mi_switch() at netbsd:mi_switch+0x2c5
 kpreempt() at netbsd:kpreempt+0xe2
 Xpreemptrecurse() at netbsd:Xpreemptrecurse+0x15
 spawn_return() at netbsd:spawn_return+0x1eb
 
 db{2}> ps          
 PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
 25188    1 2   2         0   fffffe8185b02800      t_fileactions
 26444>   1 7   2         0   fffffe81bdc82400      t_fileactions
 (other CPUs are idle)
 db{2}> ps /a
 PID     COMMAND      STRUCT PROC *            UAREA *     VMSPACE/VM_MAP
 25188t_fileacti   fffffe81822942e0   fffffe810cc17d80                  0
 26444t_fileacti   fffffe8192b07540   fffffe810c7c1d80   fffffe81b0cc32e8
 
 -- 
 Manuel Bouyer <bouyer%antioche.eu.org@localhost>
      NetBSD: 26 ans d'experience feront toujours la difference
 --