kern/159345: [if_lagg] [panic] kernel with if_lagg compiled in panices at start if if_lagg.ko is loaded

Eugene Grosbein egrosbein at
Mon Aug 1 06:40:04 UTC 2011

>Number:         159345
>Category:       kern
>Synopsis:       [if_lagg] [panic] kernel with if_lagg compiled in panices at start if if_lagg.ko is loaded
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Aug 01 06:40:04 UTC 2011
>Originator:     Eugene Grosbein
>Release:        FreeBSD 8.2-STABLE amd64
FreeBSD 8.2-STABLE amd64

	If kernel has both 'device lagg' compiled in and
	if_lagg_load="YES" in /boot/loader.conf, it panices before
	crashdump device configured:

atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]
coretemp0: <CPU On-Die Thermal Sensors> on cpu0
est0: <Enhanced SpeedStep Frequency Control> on cpu0
p4tcc0: <CPU Frequency Thermal Control> on cpu0
coretemp1: <CPU On-Die Thermal Sensors> on cpu1
est1: <Enhanced SpeedStep Frequency Control> on cpu1
p4tcc1: <CPU Frequency Thermal Control> on cpu1
coretemp2: <CPU On-Die Thermal Sensors> on cpu2
est2: <Enhanced SpeedStep Frequency Control> on cpu2
p4tcc2: <CPU Frequency Thermal Control> on cpu2
coretemp3: <CPU On-Die Thermal Sensors> on cpu3
est3: <Enhanced SpeedStep Frequency Control> on cpu3
p4tcc3: <CPU Frequency Thermal Control> on cpu3
Timecounters tick every 1.000 msec
panic: lock "if_lagg list" 0xffffffff808d6e00 already initialized
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at 0xffffffff801a91da = db_trace_self_wrapper+0x2a
kdb_backtrace() at 0xffffffff8031e117 = kdb_backtrace+0x37
panic() at 0xffffffff802ec48e = panic+0x27e
lock_init() at 0xffffffff8031e99d = lock_init+0x5d
lagg_modevent() at 0xffffffff808d225f = lagg_modevent+0x1f
module_register_init() at 0xffffffff802dcb8d = module_register_init+0x7d
mi_startup() at 0xffffffff802a7fc7 = mi_startup+0x77
btext() at 0xffffffff801631fc = btext+0x2c
Uptime: 1s
Cannot dump. Device not defined or unavailable.
Automatic reboot in 15 seconds - press a key on the console to abort

	Boot kernel with device lagg compiled in and have
	if_lagg_load="YES" in /boot/loader.conf


	Unknown. Other modules do now behave so and instead of panic
	they just issue a warning.


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