Sporadic 9.0-RC2 boot-time panic

[Jeremy Chadwick]

On Mon, Nov 28, 2011 at 05:37:27PM -0500, Mike Andrews 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%

We need the following things:

* uname -a output
* dmesg output (only details specific to emX NICs please)
* pciconf -lvcb output (only details specific to emX NICs please)

CC'ing Jack Vogel (driver author) who can hopefully shed some light on
this.

-- 
| Jeremy Chadwick                                jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                   Mountain View, CA, US |
| Making life hard for others since 1977.               PGP 4BD6C0CB |