[Bug 197997] [panic] ng_pppoe sometimes panics with trap 12 when server drops session

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Tue Feb 24 18:15:15 UTC 2015


            Bug ID: 197997
           Summary: [panic] ng_pppoe sometimes panics with trap 12 when
                    server drops session
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: lev at FreeBSD.org

ng_pppoe client (used via net/mpd5) sometimes panics with Trap 12 when server
drops session.

It looks like this:

ng_pppoe[f]: no matching session
ng_pppoe[f]: no matching session
ng_pppoe[f]: no matching session
ng_pppoe[f]: no matching session
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x800625008
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff805fb6c0
stack pointer           = 0x28:0xfffffe00f7b175e0
frame pointer           = 0x28:0xfffffe00f7b17620
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 11 (irq259: em1:rx 0)
trap number             = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00f7b17200
panic() at panic+0x1c1/frame 0xfffffe00f7b172c0
trap_fatal() at trap_fatal+0x379/frame 0xfffffe00f7b17320
trap_pfault() at trap_pfault+0x284/frame 0xfffffe00f7b173c0
trap() at trap+0x425/frame 0xfffffe00f7b17520
calltrap() at calltrap+0x8/frame 0xfffffe00f7b17520
--- trap 0xc, rip = 0xffffffff805fb6c0, rsp = 0xfffffe00f7b175e0, rbp =
0xfffffe00f7b17620 ---
pppoe_findsession() at pppoe_findsession+0x80/frame 0xfffffe00f7b17620
ng_pppoe_rcvdata_ether() at ng_pppoe_rcvdata_ether+0x2a3/frame
ng_apply_item() at ng_apply_item+0x22e/frame 0xfffffe00f7b17750
ng_snd_item() at ng_snd_item+0x1a3/frame 0xfffffe00f7b17790
ether_demux() at ether_demux+0x204/frame 0xfffffe00f7b177c0
ether_nh_input() at ether_nh_input+0x36c/frame 0xfffffe00f7b17820
netisr_dispatch_src() at netisr_dispatch_src+0x62/frame 0xfffffe00f7b17890
ether_input() at ether_input+0x26/frame 0xfffffe00f7b178b0
vlan_input() at vlan_input+0x14a/frame 0xfffffe00f7b17930
ether_demux() at ether_demux+0x94/frame 0xfffffe00f7b17960
ether_nh_input() at ether_nh_input+0x36c/frame 0xfffffe00f7b179c0
netisr_dispatch_src() at netisr_dispatch_src+0x62/frame 0xfffffe00f7b17a30
ether_input() at ether_input+0x26/frame 0xfffffe00f7b17a50
if_input() at if_input+0xa/frame 0xfffffe00f7b17a60
em_rxeof() at em_rxeof+0x248/frame 0xfffffe00f7b17af0
em_msix_rx() at em_msix_rx+0x33/frame 0xfffffe00f7b17b20
intr_event_execute_handlers() at intr_event_execute_handlers+0xf9/frame
ithread_loop() at ithread_loop+0x9c/frame 0xfffffe00f7b17bb0
fork_exit() at fork_exit+0x75/frame 0xfffffe00f7b17bf0

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