| Summary: | GDB crashes when a lot of output is printed in post_event | ||
|---|---|---|---|
| Product: | gdb | Reporter: | Christian Biesinger <cbiesinger> |
| Component: | python | Assignee: | Not yet assigned to anyone <unassigned> |
| Status: | UNCONFIRMED --- | ||
| Severity: | normal | ||
| Priority: | P2 | ||
| Version: | HEAD | ||
| Target Milestone: | --- | ||
| Host: | Target: | ||
| Build: | Last reconfirmed: | ||
The readline callback handler got removed here:
#0 gdb_rl_callback_handler_remove () at ../../gdb/event-top.c:301
#1 0x00005568afc0679d in gdb_readline_wrapper_line (line=...)
at ../../gdb/top.c:977
#2 0x00005568af946435 in gdb_rl_callback_handler (rl=0x5568b2542310 "c")
at ../../gdb/event-top.c:217
#3 0x00007f1263958d9e in rl_callback_read_char () at ./callback.c:283
#4 0x00005568af9462a4 in gdb_rl_callback_read_char_wrapper_noexcept ()
at ../../gdb/event-top.c:175
#5 0x00005568af94632b in gdb_rl_callback_read_char_wrapper (
client_data=0x5568b1e219b0) at ../../gdb/event-top.c:192
#6 0x00005568af946b57 in stdin_event_handler (error=0,
client_data=0x5568b1e219b0) at ../../gdb/event-top.c:520
#7 0x00005568af944ae1 in handle_file_event (file_ptr=0x5568b2560c10,
ready_mask=1) at ../../gdb/event-loop.c:731
#8 0x00005568af94509b in gdb_wait_for_event (block=1)
at ../../gdb/event-loop.c:857
#9 0x00005568af943ed3 in gdb_do_one_event () at ../../gdb/event-loop.c:346
#10 0x00005568afc0684e in gdb_readline_wrapper (
prompt=0x7ffecb003850 "--Type <RET> for more, q to quit, c to continue without paging--") at ../../gdb/top.c:1059
#11 0x00005568afc68a4e in prompt_for_continue () at ../../gdb/utils.c:1500
#12 0x00005568afc690be in fputs_maybe_filtered (
linebuffer=0x7ffecb003a00 "Line", stream=0x5568b25760c0, filter=1)
at ../../gdb/utils.c:1737
#13 0x00005568afc69a2d in vfprintf_maybe_filtered(ui_file *, const char *, typedef __va_list_tag __va_list_tag *, int) (stream=0x5568b25760c0,
format=0x5568aff13d20 "%s", args=0x7ffecb003a78, filter=1)
at ../../gdb/utils.c:2047
#14 0x00005568afc69a89 in vfprintf_filtered (stream=0x5568b25760c0,
format=0x5568aff13d20 "%s", args=0x7ffecb003a78) at ../../gdb/utils.c:2054
#15 0x00005568afc69dae in fprintf_filtered (stream=0x5568b25760c0,
format=0x5568aff13d20 "%s") at ../../gdb/utils.c:2102
#16 0x00005568afb0de31 in gdbpy_write (self=0x0, args=0x7f1256cd6c90,
kw=0x7f1256c88168) at ../../gdb/python/python.c:1150
#17 0x00007f126277bdc3 in PyEval_EvalFrameEx ()
from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#18 0x00007f12628b9dd8 in PyEval_EvalCodeEx ()
from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#19 0x00007f1262854ae9 in ?? () from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#20 0x00007f126284ede3 in PyObject_Call ()
from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#21 0x00007f126287c39c in ?? () from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#22 0x00007f126284ede3 in PyObject_Call ()
from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#23 0x00007f12628b9307 in PyEval_CallObjectWithKeywords ()
from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#24 0x00007f126285b8ae in PyFile_WriteObject ()
from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#25 0x00007f126277b483 in PyEval_EvalFrameEx ()
from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#26 0x00007f12628b9dd8 in PyEval_EvalCodeEx ()
from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#27 0x00007f1262854ae9 in ?? () from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#28 0x00007f126284ede3 in PyObject_Call ()
from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#29 0x00007f12628b9307 in PyEval_CallObjectWithKeywords ()
from /lib/x86_64-linux-gnu/libpython2.7.so.1.0
#30 0x00005568afb0d79c in gdbpy_run_events (error=0, client_data=0x0)
at ../../gdb/python/python.c:979
#31 0x00005568af944ae1 in handle_file_event (file_ptr=0x5568b1f020d0,
ready_mask=1) at ../../gdb/event-loop.c:731
#32 0x00005568af94509b in gdb_wait_for_event (block=0)
at ../../gdb/event-loop.c:857
#33 0x00005568af943e5b in gdb_do_one_event () at ../../gdb/event-loop.c:321
#34 0x00005568af943efd in start_event_loop () at ../../gdb/event-loop.c:370
#35 0x00005568afa4e71a in captured_command_loop () at ../../gdb/main.c:331
#36 0x00005568afa4fbdb in captured_main (data=0x7ffecb0045f0)
at ../../gdb/main.c:1171
#37 0x00005568afa4fc41 in gdb_main (args=0x7ffecb0045f0)
Stack trace for the abort:
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x00007f1260bcd8ad in __GI_abort () at abort.c:79
#2 0x00007f1263958c73 in rl_callback_read_char () at ./callback.c:138
#3 0x00005568af9462a4 in gdb_rl_callback_read_char_wrapper_noexcept ()
at ../../gdb/event-top.c:175
#4 0x00005568af94632b in gdb_rl_callback_read_char_wrapper (
client_data=0x5568b1e219b0) at ../../gdb/event-top.c:192
#5 0x00005568af946b57 in stdin_event_handler (error=0,
client_data=0x5568b1e219b0) at ../../gdb/event-top.c:520
#6 0x00005568af944ae1 in handle_file_event (file_ptr=0x5568b2560c10,
ready_mask=1) at ../../gdb/event-loop.c:731
#7 0x00005568af94509b in gdb_wait_for_event (block=1)
at ../../gdb/event-loop.c:857
#8 0x00005568af943ed3 in gdb_do_one_event () at ../../gdb/event-loop.c:346
#9 0x00005568af943efd in start_event_loop () at ../../gdb/event-loop.c:370
#10 0x00005568afa4e71a in captured_command_loop () at ../../gdb/main.c:331
#11 0x00005568afa4fbdb in captured_main (data=0x7ffecb0045f0)
at ../../gdb/main.c:1171
#12 0x00005568afa4fc41 in gdb_main (args=0x7ffecb0045f0)
at ../../gdb/main.c:1186
#13 0x00005568af721394 in main (argc=1, argv=0x7ffecb0046f8)
at ../../gdb/gdb.c:32
(gdb)
So I think the issue is that gdb_readline_wrapper is on the stack here twice? |
Create a python module with this content: ``` import gdb def Event(): for x in range(0, 100): print("Line") gdb.post_event(Event) ``` Import it in GDB. When the pager asks you to continue, press "c" and enter, then press enter again. Result: readline: readline_callback_read_char() called with no handler! Aborted