Re: Regression with gdb scripts for Linux kernel

Sorry for the late reply, got lost under a pile of other stuff. Just now I reproduced the issue with current git master.

On 2014-09-01 14:28, Jan Kratochvil wrote:
> On Wed, 27 Aug 2014 08:34:58 +0200, Jan Kiszka wrote:
>> loading @0xffffffffa05da000: /data/linux/build-dbg/net/netfilter/xt_tcpudp.ko
>> ../../gdb/gdbtypes.c:1779: internal-error: resolve_dynamic_struct: Assertion `TYPE_NFIELDS (type) > 0' failed.
>>
>> Any ideas? Do you need a core file?
> 
> The file /data/linux/build-dbg/net/netfilter/xt_tcpudp.ko would be useful if
> it crashes with: gdb -readnow /data/linux/build-dbg/net/netfilter/xt_tcpudp.ko

This doesn't trigger here.

> 
> backtrace of the GDB crash would be also good.

#0  0x00007ffff64f24c9 in raise () from /lib64/libc.so.6
#1  0x00007ffff64f3958 in abort () from /lib64/libc.so.6
#2  0x00000000006874b6 in dump_core () at ../../gdb/utils.c:577
#3  0x00000000006897cc in internal_vproblem (problem=problem@entry=0xbeccc0 <internal_error_problem>, file=<optimized out>, line=<optimized out>, fmt=<optimized out>, ap=ap@entry=0x7fffffffcb68) at ../../gdb/utils.c:785
#4  0x00000000006898a9 in internal_verror (file=<optimized out>, line=<optimized out>, fmt=<optimized out>, ap=ap@entry=0x7fffffffcb68) at ../../gdb/utils.c:811
#5  0x00000000006b90c2 in internal_error (file=file@entry=0x7fc9c5 "../../gdb/gdbtypes.c", line=line@entry=1804, fmt=<optimized out>) at ../../gdb/common/errors.c:55
#6  0x00000000005d9e46 in resolve_dynamic_struct (addr=18446612133224297472, type=0x1dd4df0) at ../../gdb/gdbtypes.c:1804
#7  resolve_dynamic_type_internal (type=0x1dd4df0, addr=18446612133224297472, top_level=1) at ../../gdb/gdbtypes.c:1904
#8  0x000000000056b378 in value_from_contents_and_address (type=type@entry=0x1dd4df0, valaddr=valaddr@entry=0x0, address=address@entry=18446612133224297472) at ../../gdb/value.c:3482
#9  0x00000000005737f7 in get_value_at (type=0x1dd4df0, addr=18446612133224297472, lazy=1) at ../../gdb/valops.c:916
#10 0x0000000000575ff6 in value_at_lazy (addr=<optimized out>, type=0x1dd4df0) at ../../gdb/valops.c:953
#11 value_ind (arg1=0x1f2caf0) at ../../gdb/valops.c:1571
#12 0x0000000000519577 in valpy_dereference (self=0xe8f870, args=<optimized out>) at ../../gdb/python/py-value.c:183
#13 0x00007ffff6b5bf31 in PyEval_EvalFrameEx () from /usr/lib64/libpython2.7.so.1.0
#14 0x00007ffff6b62ae6 in PyEval_EvalCodeEx () from /usr/lib64/libpython2.7.so.1.0
#15 0x00007ffff6b5c5d3 in PyEval_EvalFrameEx () from /usr/lib64/libpython2.7.so.1.0
#16 0x00007ffff6b5e32c in PyEval_EvalFrameEx () from /usr/lib64/libpython2.7.so.1.0
#17 0x00007ffff6b5e32c in PyEval_EvalFrameEx () from /usr/lib64/libpython2.7.so.1.0
#18 0x00007ffff6b62811 in PyEval_EvalCodeEx () from /usr/lib64/libpython2.7.so.1.0
#19 0x00007ffff6b46a7f in ?? () from /usr/lib64/libpython2.7.so.1.0
#20 0x00007ffff6b41f16 in PyObject_Call () from /usr/lib64/libpython2.7.so.1.0
#21 0x00007ffff6b42dfa in ?? () from /usr/lib64/libpython2.7.so.1.0
#22 0x00007ffff6b41f16 in PyObject_Call () from /usr/lib64/libpython2.7.so.1.0
#23 0x00007ffff6adaed6 in PyObject_CallMethodObjArgs () from /usr/lib64/libpython2.7.so.1.0
#24 0x000000000050893b in cmdpy_function (command=<optimized out>, args=<optimized out>, from_tty=1) at ../../gdb/python/py-cmd.c:151
#25 0x00000000006852ad in execute_command (p=<optimized out>, p@entry=0xc1ab50 "lx-symbols", from_tty=1) at ../../gdb/top.c:476
#26 0x00000000005c5b21 in command_handler (command=0xc1ab50 "lx-symbols") at ../../gdb/event-top.c:432
#27 0x00000000005c5fcc in command_line_handler (rl=<optimized out>) at ../../gdb/event-top.c:629
#28 0x00000000006ceb60 in rl_callback_read_char () at ../../readline/callback.c:220
#29 0x00000000005c5b89 in rl_callback_read_char_wrapper (client_data=<optimized out>) at ../../gdb/event-top.c:166
#30 0x00000000005c4863 in process_event () at ../../gdb/event-loop.c:339
#31 0x00000000005c4bb7 in gdb_do_one_event () at ../../gdb/event-loop.c:403
#32 0x00000000005c4dd7 in start_event_loop () at ../../gdb/event-loop.c:428
#33 0x00000000005be4d3 in captured_command_loop (data=data@entry=0x0) at ../../gdb/main.c:321
#34 0x00000000005bbbe5 in catch_errors (func=func@entry=0x5be4c0 <captured_command_loop>, func_args=func_args@entry=0x0, errstring=errstring@entry=0x793a2c "", mask=mask@entry=RETURN_MASK_ALL) at ../../gdb/exceptions.c:237
#35 0x00000000005bf42e in captured_main (data=data@entry=0x7fffffffdc70) at ../../gdb/main.c:1149
#36 0x00000000005bbbe5 in catch_errors (func=func@entry=0x5be9e0 <captured_main>, func_args=func_args@entry=0x7fffffffdc70, errstring=errstring@entry=0x793a2c "", mask=mask@entry=RETURN_MASK_ALL) at ../../gdb/exceptions.c:237
#37 0x00000000005bf8db in gdb_main (args=args@entry=0x7fffffffdc70) at ../../gdb/main.c:1157
#38 0x000000000046a425 in main (argc=<optimized out>, argv=<optimized out>) at ../../gdb/gdb.c:32


HTH - otherwise let me know what I could do.

Jan

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