I've been having trouble getting gdb -k on alpha to give me sensible backtraces. For example, here is the backtrace of a softupdates panic that I dumped by calling doadump in ddb:
(kgdb) bt
#0 0xfffffc0000421828 in doadump ()
at /a/asami/portbuild/alpha/src-client/sys/kern/kern_shutdown.c:238
#1 0xfffffc0000355060 in db_fncall (dummy1=0, dummy2=0, dummy3=0, dummy4=0x0)
at /a/asami/portbuild/alpha/src-client/sys/ddb/db_command.c:546
#2 0xfffffc0000354cb4 in db_command (last_cmdp=0xfffffc00006673b8, cmd_table=0x0,
aux_cmd_tablep=0xfffffc0000616728, aux_cmd_tablep_end=0xfffffc0000616748)
at /a/asami/portbuild/alpha/src-client/sys/ddb/db_command.c:346
#3 0xfffffc0000354e34 in db_command_loop ()
at /a/asami/portbuild/alpha/src-client/sys/ddb/db_command.c:470
#4 0xfffffc0000359244 in db_trap (type=0, code=0)
at /a/asami/portbuild/alpha/src-client/sys/ddb/db_trap.c:72
#5 0xfffffc000057ee70 in kdb_trap (a0=1, a1=0, a2=0, entry=3, regs=0xfffffe0006c59818)
at /a/asami/portbuild/alpha/src-client/sys/alpha/alpha/db_interface.c:211
#6 0xfffffc000058fe48 in trap (a0=1, a1=1, a2=18446739675669307791, entry=3,
framep=0xfffffe0006c59818) at
/a/asami/portbuild/alpha/src-client/sys/alpha/alpha/trap.c:382
#7 0xfffffc0000580928 in XentIF () at machine/asm.h:62
#8 0xfffffc000057eff0 in Debugger (msg=---Can't read userspace from dump, or kernel
process---
)
at /a/asami/portbuild/alpha/src-client/sys/alpha/alpha/db_interface.c:278
warning: Hit beginning of text section without finding
warning: enclosing function for address 0x6
This warning occurs if you are debugging a function without any symbols
(for example, in a stripped executable). In that case, you may wish to
increase the size of the search with the `set heuristic-fence-post' command.
Otherwise, you told GDB there was a function where there isn't one, or
(more likely) you have encountered a bug in GDB.
(kgdb)
Can someone please look into this?
Kris
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