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

["Greg A. Woods; Planix, Inc." <woods%planix.ca@localhost>]

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

From: "Greg A. Woods; Planix, Inc." <woods%planix.ca@localhost>
To: yamt%mwd.biglobe.ne.jp@localhost (YAMAMOTO Takashi)
Cc: gnats-bugs%NetBSD.org@localhost,
 kern-bug-people%netbsd.org@localhost
Subject: Re: kern/38246: another simple_lock deadlock in netbsd-4, possibly 
scheduler related (sa_switch(2073.2): no upcall data.)
Date: Mon, 17 Mar 2008 12:01:49 -0400

 On 16-Mar-08, at 6:59 PM, YAMAMOTO Takashi wrote:
 
 >> [Sun Mar 16 11:39:33 2008]db{0}> trace
 >> [Sun Mar 16 11:39:36 2008]cpu_Debugger 
 >> (d95456f4,1,ffff,c095b5c7,c041cfe0) at netbsd:cpu_Debugger+0x4
 >> [Sun Mar 16 11:39:36 2008]_simple_lock_assert_unlocked 
 >> (c09de194,c093178f,c0989310,2fc,596) at  
 >> netbsd:_simple_lock_assert_unlocked+0x135
 >> [Sun Mar 16 11:39:36 2008]wakeup(c5e9ce6c,c09875cc,4eb,d9545780,0)  
 >> at netbsd:wakeup+0x32
 >> [Sun Mar 16 11:39:36 2008]knote_enqueue 
 >> (c5e9de58,0,d95457cc,c03c87d9,c) at netbsd:knote_enqueue+0x1ae
 >> [Sun Mar 16 11:39:36 2008]knote(c0a6dfd0,0,32373032,c,d9668018) at  
 >> netbsd:knote+0x42
 >> [Sun Mar 16 11:39:36 2008]logwakeup(c0988f88,5,0,0,d95457d0) at  
 >> netbsd:logwakeup+0x34
 >> [Sun Mar 16 11:39:36 2008]printf(c0988f88,819,2,3a7,c0a564d0) at  
 >> netbsd:printf+0xc5
 >> [Sun Mar 16 11:39:36 2008]sa_switch(d93f6208,0,2,238,d967aa84) at  
 >> netbsd:sa_switch+0x3eb
 >
 > see PR/20536.
 
 Hmmmm....  "suspended"????  and without any hint as to what the fix  
 is, yet it continues on through three more major releases!
 
 -- 
                                        Greg A. Woods; Planix, Inc.
                                        <woods%planix.ca@localhost>