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Re: [patch/rfc] Add a sentinel frame


Andrew Cagney wrote:
Michal Ludvig wrote:

Hi Andrew,
I'm getting lots of internal errors due to the fact that this function is called while running x86-64 testsuite on mainline.

+static void
+sentinel_frame_pop (struct frame_info *frame,
+ void **cache,
+ struct regcache *regcache)
+{
+ internal_error (__FILE__, __LINE__, "Function sentinal_frame_pop called");
+}

How can I avoid these errors?
Can you please post a stack backtrace and a transcript illustrating the problem? The above assertion is correct - for some reason GDB is trying to pop the wrong frame :-(
Hi again,
I got back to the mainline/"sentinel" problem and have found that it happens when a program's function is called from a gdb prompt.

To reproduce create a very simple program:
int func(int arg) { return 2*arg; }
int main(int argc) { return func(argc); }

Then run mainline GDB on x86-64:
(gdb) break main
(gdb) run
(gdb) print func(1)
../../gdb-head/gdb/sentinel-frame.c:102: internal-error: Function sentinal_frame_pop called
A problem internal to GDB has been detected. Further
debugging may prove unreliable.
Quit this debugging session? (y or n)

Attached is a backtrace of this failing GDB.
Any ideas?

Michal Ludvig
--
* SuSE CR, s.r.o * mludvig@suse.cz
* (+420) 296.545.373 * http://www.suse.cz
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This GDB was configured as "x86_64-unknown-linux-gnu"...
Core was generated by `./gdb b'.
Program terminated with signal 6, Aborted.
Reading symbols from /lib64/libncurses.so.5...done.
Loaded symbols for /lib64/libncurses.so.5
Reading symbols from /lib64/libm.so.6...done.
Loaded symbols for /lib64/libm.so.6
Reading symbols from /lib64/libdl.so.2...done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /lib64/libc.so.6...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib64/libthread_db.so.1...done.
Loaded symbols for /lib64/libthread_db.so.1
#0  0x0000002a95a84b39 in kill () from /lib64/libc.so.6
Setting up the environment for debugging gdb.
Breakpoint 1 at 0x4e28de: file ../../gdb-head/gdb/utils.c, line 800.
Breakpoint 2 at 0x43e907: file ../../gdb-head/gdb/cli/cli-cmds.c, line 202.
(top-gdb) bt
#0  0x0000002a95a84b39 in kill () from /lib64/libc.so.6
#1  0x0000002a95a84861 in raise () from /lib64/libc.so.6
#2  0x0000002a95a85e90 in abort () from /lib64/libc.so.6
#3  0x00000000004e27ea in internal_vproblem (problem=0x7a8d40, 
    file=0x66e740 "../../gdb-head/gdb/sentinel-frame.c", line=102, 
    fmt=0x66e780 "Function sentinal_frame_pop called", ap=0x7fbfffe430)
    at ../../gdb-head/gdb/utils.c:769
#4  0x00000000004e2847 in internal_verror (
    file=0x66e740 "../../gdb-head/gdb/sentinel-frame.c", line=102, 
    fmt=0x66e780 "Function sentinal_frame_pop called", ap=0x7fbfffe430)
    at ../../gdb-head/gdb/utils.c:792
#5  0x00000000004e292b in internal_error (
    file=0x66e740 "../../gdb-head/gdb/sentinel-frame.c", line=102, 
    string=0x66e780 "Function sentinal_frame_pop called")
    at ../../gdb-head/gdb/utils.c:801
#6  0x00000000005446d1 in sentinel_frame_pop (frame=0x82c100, cache=0x82c130, 
    regcache=0x850610) at ../../gdb-head/gdb/sentinel-frame.c:102
#7  0x00000000004e6692 in frame_pop (frame=0x82c100)
    at ../../gdb-head/gdb/frame.c:164
#8  0x000000000048a3c4 in normal_stop () at ../../gdb-head/gdb/infrun.c:3113
#9  0x000000000048727c in proceed (addr=4195336, siggnal=TARGET_SIGNAL_0, step=0)
    at ../../gdb-head/gdb/infrun.c:805
#10 0x0000000000484d62 in run_stack_dummy (addr=4195336, buffer=0x9b9ae0)
    at ../../gdb-head/gdb/infcmd.c:1041
#11 0x0000000000465c78 in hand_function_call (function=0x9b99e0, nargs=1, 
    args=0x7fbfffe8e8) at ../../gdb-head/gdb/valops.c:1684
#12 0x0000000000465dcd in call_function_by_hand (function=0x9b99e0, nargs=1, 
    args=0x7fbfffe8e8) at ../../gdb-head/gdb/valops.c:1808
#13 0x0000000000460566 in evaluate_subexp_standard (expect_type=0x0, exp=0x9b9900, 
    pos=0x7fbfffec04, noside=EVAL_NORMAL) at ../../gdb-head/gdb/eval.c:940
#14 0x000000000045e1df in evaluate_subexp (expect_type=0x0, exp=0x6, pos=0xd, 
    noside=EVAL_NORMAL) at ../../gdb-head/gdb/eval.c:70
#15 0x000000000045e3ba in evaluate_expression (exp=0x9b9900)
    at ../../gdb-head/gdb/eval.c:159
#16 0x0000000000470051 in print_command_1 (exp=0x800cd2 "func(1)", inspect=0, 
    voidprint=1) at ../../gdb-head/gdb/printcmd.c:907
#17 0x0000000000470198 in print_command (exp=0x800cd2 "func(1)", from_tty=1)
    at ../../gdb-head/gdb/printcmd.c:951
#18 0x000000000043a2e4 in do_cfunc (c=0x811960, args=0x800cd2 "func(1)", 
    from_tty=1) at ../../gdb-head/gdb/cli/cli-decode.c:53
#19 0x000000000043c921 in cmd_func (cmd=0x811960, args=0x800cd2 "func(1)", 
    from_tty=1) at ../../gdb-head/gdb/cli/cli-decode.c:1523
#20 0x00000000004dfb5c in execute_command (p=0x800cd8 ")", from_tty=1)
    at ../../gdb-head/gdb/top.c:711
#21 0x00000000004dfd34 in command_loop () at ../../gdb-head/gdb/top.c:792
#22 0x0000000000492824 in current_interp_command_loop ()
    at ../../gdb-head/gdb/interps.c:279
#23 0x0000000000437dcd in captured_command_loop (data=0x0)
    at ../../gdb-head/gdb/main.c:100
#24 0x00000000004df74f in do_catch_errors (uiout=0x82efb0, data=0x7fbfffefd0)
    at ../../gdb-head/gdb/top.c:492
#25 0x00000000004df5ae in catcher (func=0x4df726 <do_catch_errors>, 
    func_uiout=0x82efb0, func_args=0x7fbfffefd0, func_val=0x7fbfffeff0, 
    func_caught=0x7fbfffefec, errstring=0x60e62d "", mask=6)
    at ../../gdb-head/gdb/top.c:424
#26 0x00000000004df7a0 in catch_errors (func=0x437dbc <captured_command_loop>, 
    func_args=0x0, errstring=0x60e62d "", mask=6) at ../../gdb-head/gdb/top.c:504
#27 0x0000000000438b20 in captured_main (data=0x7fbffff490)
    at ../../gdb-head/gdb/main.c:797
#28 0x00000000004df74f in do_catch_errors (uiout=0x7a3860, data=0x7fbffff420)
    at ../../gdb-head/gdb/top.c:492
#29 0x00000000004df5ae in catcher (func=0x4df726 <do_catch_errors>, 
    func_uiout=0x7a3860, func_args=0x7fbffff420, func_val=0x7fbffff440, 
    func_caught=0x7fbffff43c, errstring=0x60e62d "", mask=6)
    at ../../gdb-head/gdb/top.c:424
#30 0x00000000004df7a0 in catch_errors (func=0x437dfc <captured_main>, 
    func_args=0x7fbffff490, errstring=0x60e62d "", mask=6)
    at ../../gdb-head/gdb/top.c:504
#31 0x0000000000438b53 in gdb_main (args=0x7fbffff490)
    at ../../gdb-head/gdb/main.c:806
#32 0x0000000000437db8 in main (argc=2, argv=0x7fbffff528)
    at ../../gdb-head/gdb/gdb.c:33
#33 0x0000002a95a74035 in __libc_start_main () from /lib64/libc.so.6
#34 0x0000000000437cda in _start ()
(top-gdb) 

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