Re: kern/38273 panic: LOCKDEBUG, "lockdebug_barrier: spin lock held", from ld_ataraid_start_raid0()

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

The following reply was made to PR kern/38273; it has been noted by GNATS.

From: "Greg A. Woods" <woods%planix.com@localhost>
To: NetBSD GNATS <gnats-bugs%NetBSD.org@localhost>
Cc: Juan RP <xtraeme%gmail.com@localhost>
Subject: Re: kern/38273 panic: LOCKDEBUG, "lockdebug_barrier: spin lock held", 
from ld_ataraid_start_raid0()
Date: Thu, 18 Sep 2008 15:57:39 -0400

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 FYI, with yesterday's kernel the reboot from DDB hung, and after sending
 a BREAK I got the following backtrace.
 
 db{0}> reboot
 syncing disks... [-- break #1 sent -- `\z' -- Thu Sep 18 14:53:48 2008]
 fatal breakpoint trap in supervisor mode
 trap type 1 code 0 eip c05ae36c cs 8 eflags 202 cr2 d1c19000 ilevel 8
 Stopped in pid 0.9 (system) at  netbsd:breakpoint+0x4:  popl    %ebp
 db{0}> trace
 breakpoint(0,3f8,5,0,c0bd1e60,d0e80bcc,d0d0cf6c,c32c4000,c32c5000,800) at n=
 etbsd:breakpoint+0x4
 comintr(d0e80ac0,d098dc20,2f0fe20f,70ff10b,ef00f8f,2f0e0d8f,f0fb20f,50ff20f=
 ,ff00f0d,f0e850f) at netbsd:comintr+0x575
 DDB lost frame for netbsd:Xintr_ioapic_edge10+0xa9, trying 0xd0d0cf74
 Xintr_ioapic_edge10() at netbsd:Xintr_ioapic_edge10+0xa9
 --- interrupt ---
 --- switch to interrupt stack ---
 lockdebug_unlocked(d0879940,c051e57e,0,c051e510,c0b37940,c0a,d098dcbc,c051e=
 57e,d0879940,64) at netbsd:lockdebug_unlocked+0x1e
 mutex_vector_exit(d0879940,64,d098dd0c,c051e9a6,9c3000,0,64,0,0,3) at netbs=
 d:mutex_vector_exit+0x1fa
 cache_unlock_cpus(9c3000,0,64,0,0,3,19800,0,8,246) at netbsd:cache_unlock_c=
 pus+0x2e
 cache_reclaim(0,0,64,cc4c4e40,c051ef10,0,0,c01002e1,cc4ca9a0,0) at netbsd:c=
 ache_reclaim+0x276
 cache_thread(cc4ca9a0,0,c01002cd,0,c01002cd,0,0,0,0,0) at netbsd:cache_thre=
 ad+0x25
 db{0}> reboot
 rebooting...
 
 
 Today's kernel, with your KERNEL_LOCK() change, simply hangs, presumably
 with NMIs blocked entirely as the BREAK is being ignored even after
 several minutes:
 
 db{1}> reboot
 syncing disks... [halt sent]
 [halt sent]
 [halt sent]
 [halt sent]
 
 guess I'll have to give it a hard reset on the front panel....
 
 --=20
                                                Greg A. Woods
                                                Planix, Inc.
 
 <woods%planix.com@localhost>     +1 416 489-5852 x122     
http://www.planix.com/
 
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