kern/123160: Panic and reboot at sysctl kern.polling.enable=0

[tempo]

>Number:         123160
>Category:       kern
>Synopsis:       Panic and reboot at sysctl kern.polling.enable=0
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Apr 28 04:20:01 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     tempo
>Release:        7.0-STABLE
>Organization:
tempo
>Environment:
FreeBSD pppoe 7.0-STABLE FreeBSD 7.0-STABLE #4: Thu Feb 28 17:36:09 KRAT 2008     tempo at pppoe1:/usr/obj/usr/src/sys/PPPoE  i386

>Description:
Is available pppoe a server, on it is the order of 700 clients, loading on a network 500 mbit. is one em0 and 300 vlans. At change kern.polling.enable=0 or kern.polling.enable=1, the system panics. The panic can happens also itself, after several business hours. In rules ipfw 92 lines, from them 34 pipe. A panic have begun after addition pipe on a server, before uptime there were 80 days. The panic can happen and itself, after several business hours.




(kgdb) bt
#0  doadump () at pcpu.h:195
#1  0xc0566ba7 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xc0566e69 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xc079bd5c in trap_fatal (frame=0xd4b22a90, eva=12) at /usr/src/sys/i386/i386/trap.c:899
#4  0xc079bfc0 in trap_pfault (frame=0xd4b22a90, usermode=0, eva=12) at /usr/src/sys/i386/i386/trap.c:812
#5  0xc079c942 in trap (frame=0xd4b22a90) at /usr/src/sys/i386/i386/trap.c:490
#6  0xc07832cb in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7  0xc05b1e56 in m_copym (m=0x0, off0=2992, len=1496, wait=1) at /usr/src/sys/kern/uipc_mbuf.c:539
#8  0xc062a615 in ip_fragment (ip=0xc3b8c002, m_frag=0xd4b22bac, mtu=1500, if_hwassist_flags=38, sw_csum=1)
    at /usr/src/sys/netinet/ip_output.c:726
#9  0xc061ea6a in ip_fastforward (m=0xc608b400) at /usr/src/sys/netinet/ip_fastfwd.c:568
#10 0xc05fc795 in ether_demux (ifp=0xc2a59000, m=0xc608b400) at /usr/src/sys/net/if_ethersubr.c:770
#11 0xc05fcbc3 in ether_input (ifp=0xc2a59000, m=0xc608b400) at /usr/src/sys/net/if_ethersubr.c:692
#12 0xc04901b3 in em_rxeof (adapter=0xc2a18000, count=1) at /usr/src/sys/dev/em/if_em.c:4542
#13 0xc0490bda in em_poll (ifp=0xc2a59000, cmd=POLL_ONLY, count=5) at /usr/src/sys/dev/em/if_em.c:1433
#14 0xc055babb in netisr_poll () at /usr/src/sys/kern/kern_poll.c:432
#15 0xc0605762 in swi_net (dummy=0x0) at /usr/src/sys/net/netisr.c:254
#16 0xc0548d1b in ithread_loop (arg=0xc2983260) at /usr/src/sys/kern/kern_intr.c:1036
#17 0xc0545b19 in fork_exit (callout=0xc0548b70 <ithread_loop>, arg=0xc2983260, frame=0xd4b22d38) at /usr/src/sys/kern/kern_fork.c:781
#18 0xc0783340 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:205





>How-To-Repeat:
To establish mpd5 on freebsd 7., to connect 700 clients to it and to include pipes/
>Fix:
I do not know

>Release-Note:
>Audit-Trail:
>Unformatted: