On 03/15/2015 03:36 PM, Richard Weinberger wrote:
> BTW: Just ran a x86 UML with CONFIG_MCORE2=y. Works perfectly fine.
The picture isn't clear.
After twiddling with the kernel config I got a working .config with CORE2=y.
This runs fine if compiled with vanilla gcc 4.8.3.
Compiled with the default (hardened) gcc it hangs as expected. After waiting a
long time I do get :
$> /home/tfoerste/devel/linux/linux earlyprintk
ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap
eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=2000M con0=fd:0,fd:1 con=pts
umid=uml_trinity rootfstype=ext4 softlockup_all_cpu_backtrace=1
Locating the bottom of the address space ... 0x1000
Locating the top of the address space ... 0xffffd000
Core dump limits :
soft - 0
hard - NONE
...
device-mapper: ioctl: 4.30.0-ioctl (2014-12-22) initialised: dm-de...@redhat.com
TCP: cubic registered
NET: Registered protocol family 17
Key type dns_resolver registered
Initialized stdio console driver
Console initialized on /dev/tty0
console [tty0] enabled
console [tty0] enabled
bootconsole [earlycon0] disabled
bootconsole [earlycon0] disabled
Initializing software serial port version 1
console [mc-1] enabled
Netdevice 0 (72:ef:3d:9f:c3:5a) :
TUN/TAP backend -
Btrfs loaded
winch_thread : TIOCSCTTY failed on fd 1 err = 1
EXT4-fs (ubda): mounted filesystem with ordered data mode. Opts: (null)
VFS: Mounted root (ext4 filesystem) readonly on device 98:0.
devtmpfs: mounted
Stub registers -
0 - 0
1 - 101b7c
2 - 101afc
3 - 0
4 - 0
5 - 101ae8
6 - b
7 - 2b
8 - 2b
9 - 0
10 - 0
11 - ffffffff
12 - 1000d9
13 - 23
14 - 10206
15 - 100ad8
16 - 2b
wait_stub_done : failed to wait for SIGTRAP, pid = 1420, n = 1420, errno = 0,
status = 0xb7f
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
CPU: 0 PID: 1 Comm: init Not tainted 4.0.0-rc3-00222-g7cd9beb3 #3
Stack:
0854eca5 0854eca5 085ae547 00000000 84c9fe24 84eb1c38 84c8bad0 084c9933
00000000 84c8baa8 84c8baf8 084c61c0 0855b150 0868f580 0855b2ec 84c8bb08
0810329a 84c9fe24 84eb1c38 84c98000 84c8bb38 08111881 0855b2ec 0000000b
Call Trace:
[<080ef8c6>] show_stack+0xd6/0x1a0
[<084c9933>] dump_stack+0x26/0x28
[<084c61c0>] panic+0x7a/0x194
[<0810329a>] ? unblock_signals+0x1a/0xa0
[<08111881>] do_exit+0x9d1/0x9e0
[<08117ee5>] ? recalc_sigpending+0x15/0x50
[<08111907>] do_group_exit+0x37/0xc0
[<0811a46b>] get_signal+0x18b/0x570
[<08103599>] ? set_signals+0x19/0x60
[<080ef466>] kern_do_signal+0x46/0x300
[<0812ab00>] ? wake_up_state+0x10/0x20
[<08118782>] ? signal_wake_up_state+0x22/0x30
[<08118dcd>] ? __send_signal.constprop.29+0xfd/0x2b0
[<081387f5>] ? vprintk_emit+0x205/0x450
[<0810329a>] ? unblock_signals+0x1a/0xa0
[<081035c8>] ? set_signals+0x48/0x60
[<081197a5>] ? force_sig_info+0x95/0xb0
[<080ef73a>] do_signal+0x1a/0x20
[<080f0b85>] fatal_sigsegv+0x25/0x30
[<0810678b>] wait_stub_done+0xeb/0x130
[<0810683d>] get_skas_faultinfo.part.1+0x6d/0x100
[<08106935>] get_skas_faultinfo+0x65/0x90
[<0810c20d>] ? get_fp_registers+0x4d/0x60
[<081070ca>] userspace+0x55a/0x650
[<08199c54>] ? do_execve+0x24/0x30
[<080ed01b>] ? run_init_process+0x2b/0x30
[<080ed02f>] ? try_to_run_init_process+0xf/0x40
[<08128652>] ? async_synchronize_full+0x22/0x30
[<084c5d32>] ? kernel_init+0x92/0xd0
[<080ee512>] new_thread_handler+0x82/0x90
/home/tfoerste/workspace/bin/start_uml.sh: line 104: 1351 Aborted
$STRACE $LINUX earlyprintk ubda=$ROOTFS ubdb=$SWAP eth0=$NET mem=$MEM $TTY
umid=uml_$NAME rootfstype=ext4 "$ARGS"
FWIW Gentoo give us the choice :
$ gcc-config -l
[1] x86_64-pc-linux-gnu-4.8.3 *
[2] x86_64-pc-linux-gnu-4.8.3-hardenednopie
[3] x86_64-pc-linux-gnu-4.8.3-hardenednopiessp
[4] x86_64-pc-linux-gnu-4.8.3-hardenednossp
[5] x86_64-pc-linux-gnu-4.8.3-vanilla
--
Toralf
pgp key: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 0076 E94E
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