Sporadic 9.0-RC2 boot-time panic

[Ronald Klop]

On Mon, 28 Nov 2011 23:37:27 +0100, Mike Andrews <mandrews at bit0.com> wrote:

> *Sometimes* when booting 9.0-RC2 on *some* of my machines, I'll get one  
> of the following two panics during multiuser startup, usually while  
> running the /usr/local/etc/rc.d scripts.  (The instruction pointer is  
> always exactly one of these two, and they look fairly related.)  If  
> after two or three reboots it manages to not panic, the system will run  
> perfectly stable.
>
> For some probably-unrelated reason, the dump never finishes in either  
> case.
>
> First panic (note em0 warning before it):
> -----
> em0: discard frame w/o packet header
>
>
> Fatal trap 9: general protection fault while in kernel mode
> cpuid = 0; apic id = 00
> instruction pointer     = 0x20:0xffffffff805e4fc5
> stack pointer           = 0x28:0xffffff80003299e0
> frame pointer           = 0x28:0xffffff8000329a00
> 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         = 12 (irq256: em0:rx 0)
> trap number             = 9
> panic: general protection fault
> cpuid = 0
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
> kdb_backtrace() at kdb_backtrace+0x37
> panic() at panic+0x187
> trap_fatal() at trap_fatal+0x290
> trap() at trap+0x10a
> calltrap() at calltrap+0x8
> --- trap 0x9, rip = 0xffffffff805e4fc5, rsp = 0xffffff80003299e0, rbp =  
> 0xffffff8000329a00 ---
> m_freem() at m_freem+0x25
> ether_nh_input() at ether_nh_input+0x82
> netisr_dispatch_src() at netisr_dispatch_src+0x20b
> em_rxeof() at em_rxeof+0x1ca
> em_msix_rx() at em_msix_rx+0x24
> intr_event_execute_handlers() at intr_event_execute_handlers+0x104
> ithread_loop() at ithread_loop+0xa4
> fork_exit() at fork_exit+0x11f
> fork_trampoline() at fork_trampoline+0xe
> --- trap 0, rip = 0, rsp = 0xffffff8000329d00, rbp = 0 ---
> Uptime: 49s
> Dumping 679 out of 12263 MB:
>
> -----
>
> Second panic (no em0 discard warning this time):
>
> -----
>
> Fatal trap 9: general protection fault while in kernel mode
> cpuid = 0; apic id = 00
> instruction pointer     = 0x20:0xffffffff8063c0e4
> stack pointer           = 0x28:0xffffff8000329a00
> frame pointer           = 0x28:0xffffff8000329a40
> 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         = 12 (irq256: em0:rx 0)
> trap number             = 9
> panic: general protection fault
> cpuid = 0
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
> kdb_backtrace() at kdb_backtrace+0x37
> panic() at panic+0x187
> trap_fatal() at trap_fatal+0x290
> trap() at trap+0x10a
> calltrap() at calltrap+0x8
> --- trap 0x9, rip = 0xffffffff8063c0e4, rsp = 0xffffff8000329a00, rbp =  
> 0xffffff8000329a40 ---
> ether_nh_input() at ether_nh_input+0x94
> netisr_dispatch_src() at netisr_dispatch_src+0x20b
> em_rxeof() at em_rxeof+0x1ca
> em_msix_rx() at em_msix_rx+0x24
> intr_event_execute_handlers() at intr_event_execute_handlers+0x104
> ithread_loop() at ithread_loop+0xa4
> fork_exit() at fork_exit+0x11f
> fork_trampoline() at fork_trampoline+0xe
> --- trap 0, rip = 0, rsp = 0xffffff8000329d00, rbp = 0 ---
> Uptime: 46s
> Dumping 657 out of 12263 MB:..3%
>
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Does it help if you disable msix on your em0?
Google for 'sysctl em msix'. Or run 'sysctl -a | grep msix'.

NB: I know nothing about the details of em of msix, so hopefully somebody  
with more clue responds also.

Ronald.