kernel crash in kdb_enter
Johan Karlsson
johan at freebsd.org
Mon Jul 26 06:34:11 PDT 2004
Hi
I got the following in my /var/log/messsage:
Jul 26 14:04:41 numeri kernel: Fatal trap 3: breakpoint instruction fault while in kernel mode
Jul 26 14:04:41 numeri kernel: instruction pointer = 0x8:0xc04de1c4
Jul 26 14:04:41 numeri kernel: stack pointer = 0x10:0xde3c9304
Jul 26 14:04:41 numeri kernel: frame pointer = 0x10:0xde3c9304
Jul 26 14:04:41 numeri kernel: code segment = base 0x0, limit 0xfffff, type 0x1b
Jul 26 14:04:41 numeri kernel: = DPL 0, pres 1, def32 1, gran 1
Jul 26 14:04:41 numeri kernel: processor eflags = IOPL = 0
Jul 26 14:04:41 numeri kernel: current process = 676 (mozilla-bin)
Jul 26 14:04:41 numeri kernel: trap number = 3
Jul 26 14:04:41 numeri kernel: panic: breakpoint instruction fault
Jul 26 14:04:41 numeri kernel: KDB: enter: panic
I got a gassilion of them with different stack/frame pointers but all with the
same instruction pointer. According to nm this instruction pointer is in
kdb_enter:
k at numeri ~ >nm -n /boot/kernel/kernel | grep c04de1
c04de114 T kdb_backtrace
c04de144 T kdb_dbbe_select
c04de198 T kdb_enter
c04de1c8 T kdb_init
It seems likt the trap was repeated until it finally rebooted itself.
Unfortunatly I did not get a kernel dump since it just reboot without
trying to dump.
This is with a kernel built from source from 20040719. I'm rebuilding with
current source from now and hopefully its fixed.
The kernel includes the following options:
options KDB # Enable kernel debugger support.
options KDB_TRACE
options DDB # Support DDB.
options DDB_NUMSYM
options GDB # Support remote GDB.
options INVARIANTS # Enable calls of extra sanity checking
options INVARIANT_SUPPORT # Extra sanity checks of internal structures, required by INVARIANTS
options WITNESS # Enable checks to detect deadlocks and cycles
options WITNESS_SKIPSPIN # Don't run witness on spinlocks for speed
options ACPI_DEBUG
but I do not have it set up for remote debugging at the moment.
Also of interest, this is with ULE as scheduler and I did NOT comment out
PREEMPTION since I was hoping to get a dump if it crashed and analys it
after the fact :-(
I do not know if there is any more info I can provide but feel free to ask.
/Johan K
--
Johan Karlsson mailto:johan at FreeBSD.org
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