On 01/05, Oleg Nesterov wrote: > > On 01/05, Oleg Nesterov wrote: > > > > I'll add clear_bit(TIF_SINGLE_STEP) into do_fork() path and re-test. > > Hmm. This patch > > --- kernel/fork.c~ 2009-12-22 10:41:53.188084961 -0500 > +++ kernel/fork.c 2010-01-05 11:42:58.370636323 -0500 > @@ -1206,6 +1206,8 @@ static struct task_struct *copy_process( > * of CLONE_PTRACE. > */ > clear_tsk_thread_flag(p, TIF_SYSCALL_TRACE); > + clear_tsk_thread_flag(p, TIF_SINGLE_STEP); > + user_disable_single_step(p); > #ifdef TIF_SYSCALL_EMU > clear_tsk_thread_flag(p, TIF_SYSCALL_EMU); > #endif > > doesn't help, I still see the same XXX's in dmesg...
Oh, now I am totally confused. I reverted your fix from https://www.redhat.com/archives/utrace-devel/2010-January/msg00006.html and now there is nothing in dmesg. 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! 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)... Ý<000000000011c4fc>¨ sysc_return+0x0/0x8 Ý<00000000003cc0c6>¨ selinux_sb_copy_data+0x17e/0x238 (Ý<00000000003cbf94>¨ selinux_sb_copy_data+0x4c/0x238) Ý<00000000003b62a6>¨ security_sb_copy_data+0x4e/0x60 Ý<0000000000280338>¨ vfs_kern_mount+0x19c/0x1f4 Ý<00000000002803de>¨ kern_mount_data+0x4e/0x5c Ý<0000000000ae1908>¨ devtmpfs_init+0x60/0xbc Ý<0000000000ae1818>¨ driver_init+0x28/0x6c Ý<0000000000abe582>¨ kernel_init+0x32a/0x3d8 Ý<000000000010b8c2>¨ kernel_thread_starter+0x6/0xc Ý<000000000010b8bc>¨ kernel_thread_starter+0x0/0xc INFO: lockdep is turned off. 00: HCPGIR450W CP entered; disabled wait PSW 00020001 80000000 00000000 00114BD4 00: 00: 00: 00: 00: 00: 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??? Oleg.
