Re: kern/38246: another simple_lock deadlock in netbsd-4, possibly scheduler related (sa_switch(2073.2): no upcall data.)

["Greg A. Woods" <woods%planix.com@localhost>]

The following reply was made to PR kern/38246; it has been noted by GNATS.

From: "Greg A. Woods" <woods%planix.com@localhost>
To: NetBSD GNATS <gnats-bugs%NetBSD.org@localhost>
Cc: NetBSD Kernel Bug People <kern-bug-people%netbsd.org@localhost>,
        NetBSD GNATS Administrator <gnats-admin%netbsd.org@localhost>,
        Nick Hudson <nick.hudson%dsl.pipex.com@localhost>
Subject: Re: kern/38246: another simple_lock deadlock in netbsd-4, possibly 
scheduler related (sa_switch(2073.2): no upcall data.)
Date: Fri, 21 Mar 2008 19:14:37 -0400

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 At Fri, 21 Mar 2008 19:20:02 +0000 (UTC), Me-planix.com wrote:
 Subject: Re: kern/38246: another simple_lock deadlock in netbsd-4, possibly=
  scheduler related (sa_switch(2073.2): no upcall data.)
 >
 >  At Thu, 20 Mar 2008 18:40:56 +0000, Nick Hudson wrote:
 >  Subject: Re: kern/38246: another simple_lock deadlock in netbsd-4, possi=
 bly>   scheduler related (sa_switch(2073.2): no upcall data.)
 >  >=20
 >  > Can you try the wrstuden-fixsa branch?
 >  >=20
 >
 >  It dies during boot (with "options LOCKDEBUG" anyway):
 >
 >  ....
 >  apm0 at acpi0: Power Management spec V1.2
 >
 >  simple_lock: uninitialized lock
 >  lock: 0xc0a6e1c0, currently at: /rest/work/woods/m-NetBSD-wrstuden-fixsa=
 /sys/kern/kern_lock.c:568
 >  on CPU 0
 >  uvm_fault(0xc0a83d40, 0, 1) -> 0xe
 >  kernel: supervisor trap page fault, code=3D0
 >  Stopped in pid 0.1 (swapper) at netbsd:db_read_bytes+0x30:      movl    =
 0(%>  esi),
 >  %eax
 >  db{0}>=20
 >  db{0}> trace
 >  db_read_bytes(2,4,c0b6d6c0,c0424526,c0b6d6c4) at netbsd:db_read_bytes+0x=
 30
 >  db_get_value(2,4,0,55504320,a3020) at netbsd:db_get_value+0x20
 >  db_stack_trace_print(c0b6d79c,1,ffff,c0966106,c04237e0) at netbsd:db_sta=
 ck_trace
 >  _print+0x4ba
 >  _simple_lock(c0a6e1c0,c0995d74,238,c38a1158,0) at netbsd:_simple_lock+0x=
 153
 >  _lockmgr(c0a6e1c0,2,0,c09703b0,b6) at netbsd:_lockmgr+0x53
 >  sysmonioctl_envsys(0,c0204502,c0b6d8bc,0,0) at netbsd:sysmonioctl_envsys=
 +0x154
 >  acpiapm_get_powstat(c3d03800,0,c0b6d918,c37d6d90,5) at netbsd:acpiapm_ge=
 t_powstat+0xf0
 >  apm_attach(c3d46400,c3d46400,0,0,0) at netbsd:apm_attach+0x127
 
 
 The following change needs to be pulled up to both the netbsd-4 branch
 as well as the wrstuden-fixsa branch:
 
 ----------------------------
 revision 1.9
 date: 2007/03/11 01:24:12;  author: christos;  state: Exp;  lines: +5 -2
 branches:  1.9.2;
 open and close envsys; from Cherry.
 ----------------------------
 
 I'll now reboot my Dell PE2650 with the working kernel and see if it
 lasts the night without problems or not.....
 
 --=20
                                                Greg A. Woods
                                                Planix, Inc.
 
 <woods%planix.com@localhost>     +1 416 489-5852 x122     
http://www.planix.com/
 
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