Re: s390 user_enable_single_step() (Was: odd utrace testing results on s390x)
On Tue, Jan 05, 2010 at 08:58:18PM +0100, Oleg Nesterov wrote: I decided to re-test this all with vanilla 2.6.33-rc2. It is really amazing how long it takes to recompile/install the kernel! Then either you have a lot of steal time or an old machine (pre z10)? You could also try to define more cpus if you have a virtual machine: #cp define cpu from-to ...that is if your admin gave you permissions to do that. I spent the rest of this day fighting with this rhts machine. Result - it doesn't boot: 00: zIPL v1.8.2-5.el6 interactive boot menu 00: 00: 0. default (2.6.33-rc2) 00: 00: 1. 2.6.33-rc2 00: 2. 2.6.32.2-14.s390x.el6.s390x 00: 3. 2.6.32.2-14.el6.s390x 00: 4. linux 00: 00: Note: VM users please use '#cp vi vmsg input' 00: 00: Please choose (default will boot in 15 seconds): 00: Booting default (2.6.33-rc2)... Ý0011c4fc¨ sysc_return+0x0/0x8 Ý003cc0c6¨ selinux_sb_copy_data+0x17e/0x238 (Ý003cbf94¨ selinux_sb_copy_data+0x4c/0x238) Ý003b62a6¨ security_sb_copy_data+0x4e/0x60 Ý00280338¨ vfs_kern_mount+0x19c/0x1f4 Ý002803de¨ kern_mount_data+0x4e/0x5c Ý00ae1908¨ devtmpfs_init+0x60/0xbc Ý00ae1818¨ driver_init+0x28/0x6c Ý00abe582¨ kernel_init+0x32a/0x3d8 Ý0010b8c2¨ kernel_thread_starter+0x6/0xc Ý0010b8bc¨ kernel_thread_starter+0x0/0xc INFO: lockdep is turned off. 00: HCPGIR450W CP entered; disabled wait PSW 00020001 8000 00114BD4 Cai, any chance you can help? Using /usr/bin/console I can't choose another kernel at the 00: Please choose (default will boot in 15 seconds): stage, how can I do this??? You did enter something like #cp vi vmsg 2 and not just '2'?
Re: s390: stepping PT_PTRACED (Was: utrace failed to compile for s390x)
On Wed, Dec 09, 2009 at 08:54:28PM +0100, Oleg Nesterov wrote: (add cc's) On 12/03, Roland McGrath wrote: Not sure what should we do right now, s390 needs more attention. Also, it uses PT_PTRACED bit, I am afraid this is not what we wan with utrace. This looks simple. Its one use can just be tracehook_consider_fatal_signal(SIGTRAP) instead. I expect you can just send that change to the s390 maintainers and they will take it. Done. But... I tried to understand these check and failed. Why do we need them? They look unneeded to me, but of course I know nothing about s390. Could be. I tried to figure out when and why this was added. But looks like this is 10 year old code.
