Re: pthread_create does not return when remote debugging

Jon Ringle
2003-06-28T15:30:42Z

Arghhh... I placed my <ctrl-c> comment in the wrong spot in the last
message... Corrected below.

My apologies :)

Jon

On Saturday 28 June 2003 03:16 am, Jon Ringle wrote:
> Updated output below to have 'set debug remote 1' just before the hang...
> Seems like it would be useful information.
>
> Jon
>
> On Saturday 28 June 2003 01:28 am, Jon Ringle wrote:
> > Hi,
> >
> > I am having an issue when remote debugging a multi-threaded app, a call
> > to pthread_create hangs inside __pthread_wait_for_restart_signal on the
> > host gdb.
> >
> > Thanks in advance.
> >
> > Jon
> >
> > I've built a gdb-5.3 cross debugging environment i686 host/arm target
> > with the following:
> >
> > $ tar xzf gdb-5.3.tar.gz
> > $ mkdir gdb-native
> > $ cd gdb-native
> > $ ../gdb-5.3/configure --host=i686-pc-linux-gnu \
> > --target=arm-linux \
> > --build=i686-pc-linux-gnu
> > $ make
> > $ cd ..
> > $ mkdir gdb-cross
> > $ cd gdb-cross
> > $ HOSTCC=gcc CC='arm-linux-gcc -msoft-float' \
> > ../gdb-5.3/configure --host=arm-linux \
> > --target=arm-linux \
> > --build=i686-pc-linux-gnu
> > $ make
> > $ cd ..
> >
> > I copy gdb-cross/gdb/gdbserver/gdbserver to the target arm.
> > On the target, I execute:
> > # ./gdbserver :5555 test-thread
> > Process test-thread created; pid = 380
> >
> >
> > On the host I run:
> > $ gdb-native/gdb/gdb test-thread
>
> GNU gdb 5.3
> Copyright 2002 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you
> are welcome to change it and/or distribute copies of it under certain
> conditions. Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB. Type "show warranty" for details.
> This GDB was configured as "--host=i686-pc-linux-gnu --target=arm-linux"...
> (gdb) set solib-absolute-prefix /dev/null
> (gdb) set solib-search-path /usr/arm-linux/lib
> (gdb) target extended-remote 10.10.10.101:5555
> Remote debugging using 10.10.10.101:5555
> 0x400025c0 in ?? ()
> (gdb) b pthread_create
> Breakpoint 1 at 0x20019e0
> (gdb) c
> Continuing.
> [New Thread 1024]
> [Switching to Thread 1024]
>
> Breakpoint 1, 0x020019e0 in pthread_create ()
> (gdb) set debug remote 1
> (gdb) finish
> Sending packet: $m20019e0,4#5e...Ack
> Packet received: 04c09fe5
> Sending packet: $m204b424,4#5f...Ack
> Packet received: 0030a0e1
> Sending packet: $m204b230,4#5a...Ack
> Packet received: 0dc0a0e1
> Sending packet: $m204b234,4#5e...Ack
> Packet received: 00d82de9
> Sending packet: $m204b238,4#62...Ack
> Packet received: 04b04ce2
> Sending packet: $m204b23c,4#8d...Ack
> Packet received: 30d04de2
> Sending packet: $m204b240,4#5b...Ack
> Packet received: 10000be5
> Sending packet: $m204b244,4#5f...Ack
> Packet received: 14100be5
> Sending packet: $m204b248,4#63...Ack
> Packet received: 18200be5
> Sending packet: $m204b24c,4#8e...Ack
> Packet received: 0030a0e3
> Sending packet: $m204b250,4#5c...Ack
> Packet received: 20300be5
> Sending packet: $m204b254,4#60...Ack
> Packet received: ab0300eb
> Sending packet: $m204b258,4#64...Ack
> Packet received: 0030a0e1
> Sending packet: $m204b25c,4#8f...Ack
> Packet received: 030053e3
> Sending packet: $m204b260,4#5d...Ack
> Packet received: 020000da
> Sending packet: $m204b424,4#5f...Ack
> Packet received: 0030a0e1
> Run till exit from #0 0x020019e0 in pthread_create ()
> Sending packet: $m20019e0,4#5e...Ack
> Packet received: 04c09fe5
> Sending packet: $m20019e4,4#62...Ack
> Packet received: 0cc08fe0
> Sending packet: $M20019e4,4:01009fef#a7...Ack
> Packet received: OK
> Sending packet: $Hc400#3f...Ack
> Packet received: OK
> Sending packet: $c#63...Ack
> Packet received: T050b:54fdffbf;0d:18fdffbf;0f:e4190002;
> Sending packet: $M20019e4,4:0cc08fe0#d5...Ack
> Packet received: OK
> Sending packet: $m20019e4,4#62...Ack
> Packet received: 0cc08fe0
> Sending packet: $m4000cbd0,4#ea...Ack
> Packet received: 0dc0a0e1
> Sending packet: $M4000cbd0,4:01009fef#2f...Ack
> Packet received: OK
> Sending packet: $m20019e0,4#5e...Ack
> Packet received: 04c09fe5
> Sending packet: $M20019e0,4:01009fef#a3...Ack
> Packet received: OK
> Sending packet: $m204b424,4#5f...Ack
> Packet received: 0030a0e1
> Sending packet: $M204b424,4:01009fef#a4...Ack
> Packet received: OK
> Sending packet: $Hc0#db...Ack
> Packet received: OK
> Sending packet: $c#63...Ack

<<<<< Hang occurs here! Pressing ctrl-c to abort. >>>>>>>>>

> remote_interrupt called
> remote_stop called
> Packet received: T020b:b0fbffbf;0d:90fbffbf;0f:c4eb1440;
> Program received signal SIGINT, Interrupt.
> Sending packet: $g#67...Ack
> Packet received:
> fcffffff08000000641a11406c010000841a1140b4fbffbf16000000301a214088fdffbfdcf
>80602c0c32040b0fbffbf90fbffbf90fbffbfb4eb1440c4eb144000000000000000000000000
>0000000000000000000000000000000000000000000000000000000000000000000000000000
>0000000000000000000000000000000000000000000000000000000000000000000000000000
>000000000000000000000000010000020 Sending packet: $m4014ebc4,4#f4...Ack
> Packet received: 0040a0e1
> Sending packet: $m4014ebc4,4#f4...Ack
> Packet received: 0040a0e1
> Sending packet: $m4014eb84,4#c9...Ack
> Packet received: 0dc0a0e1
> Sending packet: $m4014eb88,4#cd...Ack
> Packet received: f0dc2de9
> Sending packet: $m4014eb8c,4#f8...Ack
> Packet received: b0a09fe5
> Sending packet: $m4014eb90,4#c6...Ack
> Packet received: b0209fe5
> Sending packet: $m4014eb94,4#ca...Ack
> Packet received: 0aa08fe0
> Sending packet: $m4014eb98,4#ce...Ack
> Packet received: 02709ae7
> Sending packet: $m4014eb9c,4#f9...Ack
> Packet received: 04b04ce2
> Sending packet: $m4014eba0,4#ee...Ack
> Packet received: 003097e5
> Sending packet: $m4014eba4,4#f2...Ack
> Packet received: 0050a0e1
> Sending packet: $m4014eba8,4#f6...Ack
> Packet received: 000053e3
> Sending packet: $m4014ebac,4#21...Ack
> Packet received: 1700001a
> Sending packet: $M4000cbd0,4:0dc0a0e1#52...Ack
> Packet received: OK
> Sending packet: $M20019e0,4:04c09fe5#a8...Ack
> Packet received: OK
> Sending packet: $M204b424,4:0030a0e1#63...Ack
> Packet received: OK
> 0x4014ebc4 in __sigsuspend (set=0xbffffbb4) at
> ../sysdeps/unix/sysv/linux/sigsuspend.c:48
> 48 ../sysdeps/unix/sysv/linux/sigsuspend.c: No such file or directory.
> in ../sysdeps/unix/sysv/linux/sigsuspend.c
> (gdb) set debug remote 0
> (gdb) bt
> #0 0x4014ebc4 in __sigsuspend (set=0xbffffbb4) at
> ../sysdeps/unix/sysv/linux/sigsuspend.c:48
> #1 0x40101b34 in __pthread_wait_for_restart_signal (self=0x401116e0) at
> pthread.c:786
> #2 0x40101138 in __pthread_create_2_1 (thread=0x206f8dc, attr=0xbffffc58,
> start_routine=0x20043ac <console>, arg=0xbffffd88) at restart.h:26
> #3 0x0204b424 in createThread (func=0x20043ac <console>, arg=0xbffffd88,
> threadname=0x204f4f0 "console") at thread.c:84
> #4 0x020022b8 in main (argc=1, argv=0xbffffdd4) at main.c:168
> #5 0x401484a0 in __libc_start_main (main=0x2002054 , argc=1,
> argv=0xbffffdd4, init=0x2001848 <_init>, fini=0x204f334 <_fini>,
> rtld_fini=0x4000ca60 <_dl_fini>,
> stack_end=0xbffffeba) at ../sysdeps/generic/libc-start.c:92