Package: gdb
Version: 6.8-3
Severity: normal
On one terminal:
$ gdbserver localhost:1234 /bin/bash
On another:
$ gdb
GNU gdb 6.8
This GDB was configured as "i686-pc-linux-gnu".
(gdb) target remote localhost:1234
Remote debugging using localhost:1234
[New Thread 12496]
warning: Could not load vsyscall page because no executable was
specified
try using the "file" command first.
0xb7fa2812 in ?? ()
(gdb) watch *(int *)0xb7fa2812
Hardware watchpoint 1: *(int *) 3086624786
(gdb) c
Continuing.
Segmentation fault
Here's what gdb was doing when it crashed:
Program terminated with signal 11, Segmentation fault.
[New process 12763]
#0 i386_linux_dr_set_addr (regnum=0, addr=3086624786) at
i386-linux-nat.c:650
650 ALL_LWPS (lp, ptid)
(gdb) bt
#0 i386_linux_dr_set_addr (regnum=0, addr=3086624786) at
i386-linux-nat.c:650
#1 0x080a5a42 in i386_insert_aligned_watchpoint (addr=3086624786,
len_rw_bits=327680) at i386-nat.c:383
#2 0x080a5b59 in i386_handle_nonaligned_watchpoint (what=WP_INSERT,
addr=3086624786, len=4, type=hw_write) at i386-nat.c:471
#3 0x080a5c93 in i386_insert_watchpoint (addr=3086624786, len=4,
type=0)
at i386-nat.c:509
#4 0x080f4413 in insert_bp_location (bpt=0x8f33b10,
tmp_error_stream=0x8f38540, disabled_breaks=0xbfa48388,
process_warning=0xbfa48380, hw_breakpoint_error=0xbfa48384)
at breakpoint.c:1187
#5 0x080f47c0 in insert_breakpoints () at breakpoint.c:1253
#6 0x08132b25 in proceed (addr=4294967295,
siggnal=TARGET_SIGNAL_DEFAULT,
step=0) at infrun.c:796
#7 0x0812ca8c in continue_command (proc_count_exp=0x0, from_tty=1)
at infcmd.c:653
#8 0x08091009 in execute_command (p=0x8ef8129 "", from_tty=1) at
top.c:449
#9 0x0813e52f in command_handler (command=0x8ef8128 "c") at
event-top.c:518
#10 0x0813f432 in command_line_handler (rl=0x8f31010 "p\203�\b`\203�\b")
at event-top.c:804
#11 0x081f18ed in rl_callback_read_char () at callback.c:205
#12 0x0813e81b in rl_callback_read_char_wrapper (client_data=0x0)
at event-top.c:177
#13 0x0813e134 in handle_file_event (event_file_desc=0) at
event-loop.c:728
#14 0x0813d4c2 in process_event () at event-loop.c:341
#15 0x0813dde0 in gdb_do_one_event (data=0x0) at event-loop.c:378
#16 0x0813a8db in catch_errors (func=0x813dc10 <gdb_do_one_event>,
func_args=0x0, errstring=0x828eba0 "", mask=6) at exceptions.c:513
#17 0x080dd2aa in tui_command_loop (data=0x0) at
..././gdb/tui/tui-interp.c:153
#18 0x0813af24 in current_interp_command_loop () at interps.c:276
#19 0x08089c3b in captured_command_loop (data=0x0) at .././gdb/main.c:99
#20 0x0813a8db in catch_errors (func=0x8089c30 <captured_command_loop>,
func_args=0x0, errstring=0x828eba0 "", mask=6) at exceptions.c:513
#21 0x080896dc in captured_main (data=0xbfa48824) at .././gdb/main.c:882
#22 0x0813a8db in catch_errors (func=0x8088a40 <captured_main>,
func_args=0xbfa48824, errstring=0x828eba0 "", mask=6) at
exceptions.c:513
#23 0x08088a31 in gdb_main (args=0xbfa48824) at .././gdb/main.c:891
#24 0x080889f5 in main (argc=Cannot access memory at address 0x10
) at gdb.c:33
(gdb)
It crashed in ALL_LWPS:
(gdb) list
645 ptid_t ptid;
646
647 gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR -
DR_FIRSTADDR);
648
649 i386_linux_dr[DR_FIRSTADDR + regnum] = addr;
650 ALL_LWPS (lp, ptid)
651 i386_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr);
652 }
653
654 void
ALL_LWPS is:
#define ALL_LWPS(LP, PTID) \
for ((LP) = lwp_list, (PTID) = (LP)->ptid; \
(LP) != NULL; \
(LP) = (LP)->next, (PTID) = (LP) ? (LP)->ptid : (PTID))
And:
(gdb) p lwp_list
$1 = (struct lwp_info *) 0x0
Interesting.
-- System Information:
Debian Release: lenny/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.26-1-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages gdb depends on:
ii libc6 2.7-13 GNU C Library: Shared libraries
ii libexpat1 2.0.1-4 XML parsing C library - runtime li
ii libncurses5 5.6+20080830-1 shared libraries for terminal hand
ii libreadline5 5.2-3 GNU readline and history libraries
gdb recommends no packages.
Versions of packages gdb suggests:
pn gdb-doc <none> (no description available)
-- no debconf information
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