Package: gdb
Version: 7.3-1+b1
Severity: normal
I've got a program, that (for the sake of testing) does fork() in a loop; I
want to follow the child.
To work around the bug in
https://lkml.org/lkml/2011/8/16/121
I've tried to set breakpoints at the end of main() and on exit() that use
"commands" to detach from the binary.
But now I get a segfault in gdb.
Sadly there's no gdb-dbg package, so I can only give the raw stack dump:
(gdb) bt
#0 0x0000000000784dba in xstrdup ()
#1 0x00000000004e3634 in ?? ()
#2 0x00000000004e2cd6 in execute_control_command ()
#3 0x000000000052bdde in ?? ()
#4 0x000000000052be70 in bpstat_do_actions ()
#5 0x00000000005afadb in ?? ()
#6 0x00000000005b0181 in ?? ()
#7 0x00007f7c51a5cfe8 in rl_callback_read_char () from /lib/x86_64-linux-
gnu/libreadline.so.6
#8 0x00000000005aef85 in ?? ()
#9 0x00000000005af9c5 in stdin_event_handler ()
#10 0x00000000005adf28 in ?? ()
#11 0x00000000005ad400 in ?? ()
#12 0x00000000005ad4cb in gdb_do_one_event ()
#13 0x00000000005a770e in catch_errors ()
#14 0x00000000004f8ca7 in ?? ()
#15 0x00000000005a7e95 in current_interp_command_loop ()
#16 0x000000000045173b in ?? ()
#17 0x00000000005a770e in catch_errors ()
#18 0x00000000004527e1 in ?? ()
#19 0x00000000005a770e in catch_errors ()
#20 0x0000000000452817 in gdb_main ()
#21 0x000000000045143f in main ()
For reference, here's the file I "source" in gdb:
set follow-fork-mode child
set detach-on-fork off
b exit
commands
detach
inferior 1
end
b *((long)main+232)
commands
detach
inferior 1
end
# and some more breakpoints on "interesting" locations
-- System Information:
Debian Release: wheezy/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable'), (1,
'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 3.0.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_AT.UTF-8, LC_CTYPE=de_AT.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages gdb depends on:
ii gdbserver 7.3-1+b1
ii libc6 2.13-21
ii libexpat1 2.0.1-7
ii libncurses5 5.9-1
ii libpython2.7 2.7.2-5
ii libreadline6 6.2-4
ii zlib1g 1:1.2.3.4.dfsg-3
gdb recommends no packages.
Versions of packages gdb suggests:
ii gdb-doc 7.3-1
-- no debconf information
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