Hi *,
I've got a system running -current that keeps crashing on me every couple of
days.
Output of ddb:
Connected to /dev/cuaU0 (speed 115200)
ddb{0}> show panic
the kernel did not panic
ddb{0}> show uvm
Current UVM status:
pagesize=4096 (0x1000), pagemask=0xfff, pageshift=12
482451 VM pages: 43158 active, 132795 inactive, 35 wired, 192336 free (24054 z
ero)
min 10% (25) anon, 10% (25) vnode, 5% (12) vtext
freemin=16081, free-target=21441, inactive-target=0, wired-max=160817
faults=2487210, traps=2404140, intrs=211883, ctxswitch=1960560 fpuswitch=0
softint=3499069, syscalls=2015497, kmapent=9
fault counts:
noram=0, noanon=0, noamap=0, pgwait=0, pgrele=0
ok relocks(total)=192470(193514), anget(retries)=603205(0), amapcopy=177151
neighbor anon/obj pg=82033/639788, gets(lock/unlock)=415897/193548
cases: anon=570367, anoncow=32838, obj=347149, prcopy=67670, przero=1469152
daemon and swap counts:
woke=0, revs=0, scans=0, obscans=0, anscans=0
busy=0, freed=0, reactivate=0, deactivate=0
pageouts=0, pending=0, nswget=0
nswapdev=1
swpages=526020, swpginuse=0, swpgonly=0 paging=0
kernel pointers:
objs(kern)=0xffffffff8238a038
ddb{0}> show trace
No such command
ddb{0}> trace
icmp_mtudisc_timeout(fffffd807a50b070,0) at icmp_mtudisc_timeout+0x77
rt_timer_timer(ffffffff8235d668) at rt_timer_timer+0x1cc
softclock_thread(ffff8000fffff260) at softclock_thread+0x13b
end trace frame: 0x0, count: -3
ddb{0}>
Output of a second crash:
ddb{0}> show panic
the kernel did not panic
ddb{0}> trace
icmp_mtudisc_timeout(fffffd8069f9f700,0) at icmp_mtudisc_timeout+0x77
rt_timer_timer(ffffffff8231bfc8) at rt_timer_timer+0x1cc
softclock_thread(ffff8000fffff500) at softclock_thread+0x13b
end trace frame: 0x0, count: -3
ddb{0}> show uvm
Current UVM status:
pagesize=4096 (0x1000), pagemask=0xfff, pageshift=12
482457 VM pages: 29240 active, 133535 inactive, 35 wired, 205028 free (25630 z
ero)
min 10% (25) anon, 10% (25) vnode, 5% (12) vtext
freemin=16081, free-target=21441, inactive-target=0, wired-max=160819
faults=687274, traps=693441, intrs=75204, ctxswitch=381252 fpuswitch=0
softint=615411, syscalls=607703, kmapent=9
fault counts:
noram=0, noanon=0, noamap=0, pgwait=0, pgrele=0
ok relocks(total)=185433(186477), anget(retries)=141598(0), amapcopy=75047
neighbor anon/obj pg=69895/201703, gets(lock/unlock)=256502/186509
cases: anon=114948, anoncow=26650, obj=237702, prcopy=17724, przero=290216
daemon and swap counts:
woke=0, revs=0, scans=0, obscans=0, anscans=0
busy=0, freed=0, reactivate=0, deactivate=0
pageouts=0, pending=0, nswget=0
nswapdev=1
swpages=526020, swpginuse=0, swpgonly=0 paging=0
kernel pointers:
objs(kern)=0xffffffff82317458
ddb{0}> show bcstats
Current Buffer Cache status:
numbufs 24114 busymapped 0, delwri 5
kvaslots 6030 avail kva slots 6030
bufpages 96426, dmapages 96426, dirtypages 20
pendingreads 0, pendingwrites 0
highflips 0, highflops 0, dmaflips 0
ddb{0}> mount
No such command
ddb{0}> trace
icmp_mtudisc_timeout(fffffd8069f9f700,0) at icmp_mtudisc_timeout+0x77
rt_timer_timer(ffffffff8231bfc8) at rt_timer_timer+0x1cc
softclock_thread(ffff8000fffff500) at softclock_thread+0x13b
end trace frame: 0x0, count: -3
Especially the line stating "the kernel did not panic" surprises me, as I am
greeted by the kernel debugger. Not sure how to interpret that.
While looking for the reason behind these "crashes", I noticed that cron is
constantly running at 99% cpu.
As a first measure I commented out all cronjobs in place (except for daily
weekly monthly as I figured these shouldnt
pose a problem). But that did not remedy the problem. Right after startup cron
starts eating away at the cpu. Does
anybody have an idea how to further analyze the issue (apart from giving it a
go by recompiling cron and using gdb) ?
Best regards,
Stephan
