Subject: -current amd64 panic, _kernel_unlock: assertion failed: olocks == 1
To: NetBSD current <>
From: Nicolas Joly <>
List: current-users
Date: 02/20/2007 15:39:30

Since a few days, i'm experiencing kernel hard lockup. The problem
arise when the Symantec (was Veritas) NetBackup server tries to backup
my up-to-date -current NetBSD/amd64 workstation using linux 32-bits
binaries (which worked perfectly during the last 5 monthes).

When stuck, the machine does not respond to anything ... I can't even
access the kernel debugger using the special key sequence. This is for

This morning, i made some experiments with all the options to isolate
the problem and got the most useful results while removing the

Kernel lock error: _kernel_unlock: assertion failed: olocks == 1

lock address : 0xffffffff80ce4ea0 type     :               spin
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                183
current cpu  :                  1 last held:                  1
current lwp  : 0xffff80004c93a900 last held: 0xffff80004c93a900
last locked  : 0xffffffff807d6801 unlocked : 0xffffffff807d682d
curcpu holds :                  2 wanted by: 000000000000000000

Stopped in pid 360.1 (bpcd) at  netbsd:breakpoint+0x5:  leave
db{1}> mach cpu 0
using CPU 0
db{1}> bt
splclock() at netbsd:splclock
_kernel_lock() at netbsd:_kernel_lock+0x1a3
intr_biglock_wrapper() at netbsd:intr_biglock_wrapper+0x23
Xintr_ioapic_level11() at netbsd:Xintr_ioapic_level11+0xdb
--- interrupt ---
Xspllower() at netbsd:Xspllower+0xe
x86_softintlock() at netbsd:x86_softintlock+0x13
DDB lost frame for netbsd:Xsoftclock+0x1a, trying 0xffff80004b4eff20
Xsoftclock() at netbsd:Xsoftclock+0x1a
--- interrupt ---
db{1}> mach cpu 1
using CPU 1
db{1}>  bt
breakpoint() at netbsd:breakpoint+0x5
cpu_Debugger() at netbsd:cpu_Debugger+0x9
panic() at netbsd:panic+0x1bd
lockdebug_lock_print() at netbsd:lockdebug_lock_print
lockdebug_abort() at netbsd:lockdebug_abort+0x47
_kernel_unlock() at netbsd:_kernel_unlock+0x126
trap() at netbsd:trap+0x9f6
--- trap (number -2134027712) ---

Thanks in advance,

Nicolas Joly

Biological Software and Databanks.
Institut Pasteur, Paris.