RE: [uml-user] "Program received signal SIGTRAP, Trace/breakpoint trap"

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If I changed to the following configuration.

Host System
2.6.12-skas3-v9-pre7, fedora 4.

Host/Guest Kernel 
http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.12.5.tar.bz2

Uml Patch
http://www.user-mode-linux.org/~blaisorblade/patches/skas3-2.6/skas-2.6.12-v
9-pre7/skas-2.6.12-v9-pre7.patch.bz2

With Disable TT mode 
Will get the following message

[root@localhost linux-2.6.12.5]# gdb linux
GNU gdb Red Hat Linux (6.3.0.0-1.21rh)
Copyright 2004 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 "i386-redhat-linux-gnu"...Using host libthread_db
library "/lib/libthread_db.so.1".

(gdb) r
Starting program: /opt2/test/linux-2.6.12.5/linux
Reading symbols from shared object read from target memory...done.
Loaded system supplied DSO at 0xffffe000
Checking for /proc/mm...found
Detaching after fork from child process 22165.
Checking for the skas3 patch in the host...found
Checking PROT_EXEC mmap in /tmp...OK
Detaching after fork from child process 22166.

Program received signal SIGUSR1, User defined signal 1.
0xffffe410 in __kernel_vsyscall ()
(gdb) c
Continuing.
Detaching after fork from child process 22173.
Detaching after fork from child process 22174.
Detaching after fork from child process 22175.

Program received signal SIGUSR1, User defined signal 1.
0xffffe410 in __kernel_vsyscall ()
(gdb) c
Continuing.

Program received signal SIGUSR1, User defined signal 1.
0xffffe410 in __kernel_vsyscall ()
(gdb) c
Continuing.
Detaching after fork from child process 22177.

Program received signal SIGUSR1, User defined signal 1.
0xffffe410 in __kernel_vsyscall ()
(gdb) c
Continuing.

Program received signal SIGUSR1, User defined signal 1.
0xffffe410 in __kernel_vsyscall ()
(gdb) c
Continuing.
c

Program received signal SIGSEGV, Segmentation fault.
0x081c7aca in ipt_register_table (table=0x8229500, repl=0x820cc60)
    at include/asm/arch/string.h:207
207     __asm__ __volatile__(
(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x081c7aca in ipt_register_table (table=0x82295c0, repl=0x820cf40)
    at include/asm/arch/string.h:207
207     __asm__ __volatile__(
(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x081c7aca in ipt_register_table (table=0x8229760, repl=0x820d340)
    at include/asm/arch/string.h:207
207     __asm__ __volatile__(
(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x08058869 in ip_nat_init () at net/ipv4/netfilter/ip_nat_core.c:521
521                     INIT_LIST_HEAD(&bysource[i]);
(gdb) c
Continuing.
Linux version 2.6.12.5 (root@localhost.localdomain) (gcc version 4.0.0
20050519 (Red Hat 4.0.0-8)) #3 Fri Aug 26 12:09:17 PDT 2005
Built 1 zonelists
Kernel command line: root=98:0
PID hash table entries: 256 (order: 8, 4096 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 29488k available
Mount-cache hash table entries: 512
Checking for host processor cmov support...Yes
Checking for host processor xmm support...No
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
Checking for /dev/anon on the host...Not available (open failed with errno
2)
NET: Registered protocol family 16
mconsole (version 2) initialized on /root/.uml/yOrYVG/mconsole
UML Audio Relay (host dsp = /dev/sound/dsp, host mixer = /dev/sound/mixer)
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
devfs: 2004-01-31 Richard Gooch (rg...@at...)
devfs: boot_options: 0x0
Initializing Cryptographic API
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: loaded (max 8 devices)
nbd: registered device at major 43
PPP generic driver version 2.4.2
SLIP: version 0.8.4-NET3.019-NEWTTY (dynamic channels, max=256).
tun: Universal TUN/TAP device driver, 1.6
tun: (C) 1999-2004 Max Krasnyansky <ma...@qu...>
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
ip_conntrack version 2.1 (230 buckets, 1840 max) - 216 bytes per conntrack
ip_tables: (C) 2000-2002 Netfilter core team
Initializing IPsec netlink socket
NET: Registered protocol family 1
NET: Registered protocol family 17
NET: Registered protocol family 15
Initialized stdio console driver
Console initialized on /dev/tty0
Initializing software serial port version 1
Failed to open 'root_fs', errno = 2
VFS: Cannot open root device "98:0" or unknown-block(98,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(98,0)

EIP: 0073:[<ffffe410>] CPU: 0 Not tainted ESP: 007b:b7e35f8c EFLAGS:
00000246
    Not tainted
EAX: 00000000 EBX: 00005695 ECX: 00000013 EDX: 00005695
ESI: 00005687 EDI: 00000011 EBP: b7e35fb8 DS: 007b ES: 007b
088a3ad0:  [<08072d5d>] show_regs+0xd1/0xd8
088a3af0:  [<08061dbf>] panic_exit+0x27/0x48
088a3b20:  [<08086112>] notifier_call_chain+0x1e/0x40
088a3b50:  [<08079225>] panic+0x59/0x110
088a3b80:  [<080499ea>] mount_block_root+0x9a/0x104
088a3bd0:  [<08049b5a>] mount_root+0x2e/0x34
088a3bf0:  [<08049ba0>] prepare_namespace+0x40/0x144
088a3c00:  [<0805ae09>] init+0xe5/0x104
088a3c20:  [<0805dc1b>] run_kernel_thread+0x2f/0x3c
088a3ce0:  [<08063338>] new_thread_handler+0x8c/0xbc
088a3d20:  [<ffffe420>] 0xffffe420

Program exited with code 01.
(gdb) c
The program is not being run.
(gdb)

-----Original Message-----
From: Blaisorblade [mailto:bla...@ya...] 
Sent: Friday, August 26, 2005 8:38 AM
To: use...@li...; cli...@ya...
Subject: Re: [uml-user] "Program received signal SIGTRAP, Trace/breakpoint
trap"

On Friday 26 August 2005 15:07, Clifford Ton wrote:
> I continued to receive "Program received signal SIGTRAP, Trace/breakpoint
> trap". How can I fix it?
Disable TT mode in the guest kernel config and things should work again. If 
that doesn't work, I'll post some patches I'm using for that which work very

well (I'm attaching them too but they're against 2.6.13-rc, so you might get

some fuzz against 2.6.12).

Also, please, next time don't post an HTML message (you can see why in the 
following quoting:).
> My host system is 2.6.12-skas3-v9-pre7, fedora 4.

> Host/Guest Kernel
>
> http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.12.5.tar.bz2
>
> Uml Patch
>
>
http://www.user-mode-linux.org/~blaisorblade/patches/skas3-2.6/skas-2.6.12-
>v 9-pre7/skas-2.6.12-v9-pre7.patch.bz2
>
>
>
>
>
> Guest config file is in the following after the gdb message.
>
>
>
> [root@localhost linux-2.6.12.5]# gdb linux
>
> GNU gdb Red Hat Linux (6.3.0.0-1.21rh)
>
> Copyright 2004 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 "i386-redhat-linux-gnu"...Using host
> libthread_db library "/lib/libthread_db.so.1".
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade