> Hmm, I published a 2.6.18 -bs patchset time ago with some bugfixes, and some > other were merged into -stable, so you may want to try these. CKRM will still > work with them (98 % sure).
I tried both of the following patches on vanilla 2.6.18 kernel. (Without CKRM patch) http://www.user-mode-linux.org/~blaisorblade/patches/guest/uml-2.6.18.1-bb2/uml-2.6.18.1-bb2.patch.bz2 and http://www.user-mode-linux.org/~blaisorblade/patches/guest/uml-2.6.18-bb1/uml-2.6.18-bb1.patch.bz2 But still it UML didnt worked. I used GDB to locate the point where it is failing, so i got following. {{{ (gdb) bt #0 __const_udelay (usecs=4295000) at arch/um/sys-i386/delay.c:36 #1 0x0806c878 in panic (fmt=0x804e79c "\203�\024h;�\035\b��\226") at kernel/panic.c:137 #2 0x0804e79c in check_ptrace () #3 0x0806384b in os_early_checks () at include/linux/timer.h:41 #4 0x0805c1c3 in linux_main (argc=1, argv=0xafdc3e24) at arch/um/kernel/um_arch.c:352 #5 0x08061fb2 in main () at include/linux/timer.h:41 (gdb) }}} So, what I concluded from this that, panic is getting called from "check_ptrace" function. To find out why exactly panic is getting called, I added few printf statements in "check_ptrace" function in "arch/um/os-Linux/start_up.c". I managed to find out that panic is getting called from {{{ if(!WIFSTOPPED(status) || (WSTOPSIG(status) != (SIGTRAP|0x80))) panic("check_ptrace : expected (SIGTRAP|0x80), " "got status = %d", status); }}} It was not calling panic in first iteration but it was calling in second iteration inside while loop, with panic statement as {{{ check_ptrace : expected (SIGTRAP|0x80), got status = 256 }}} At first iteration, the value of status was "34175". I suppose that it should have passed the condition in following "if statement" and should have taken a break in first iteration only. ///////////////////////////////////////////////////////////////////////////// syscall = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET,0); if(syscall == __NR_getpid){ n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, __NR_getppid); if(n < 0) panic("check_ptrace : failed to modify system " "call, errno = %d", errno); break ; } ///////////////////////////////////////////////////////////////////////////// But the value of syscall in first iteration was 252 but it was expected to be 20 (i.e. __NR_getpid ). Value 252 represented "__NR_exit_group" I am not able to proceed further from this point in debugging this problem. > nothing of interest. Have you double-checked your compile-time options? > > > Looked at what's happening with strace? on using strace on uml i got following. But I am not able to make any sense out of it :-( {{{ [EMAIL PROTECTED]:~/projects/selinux/ckrm/linux-2.6.18$ strace -f ./linux execve("./linux", ["./linux"], [/* 31 vars */]) = 0 uname({sys="Linux", node="microcosm", ...}) = 0 brk(0) = 0x8275000 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xa7efe000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/lib/tls/i686/sse2/cmov/libutil.so.1", O_RDONLY) = -1 ENOENT (No such file or directory) stat64("/lib/tls/i686/sse2/cmov", 0xafd0d548) = -1 ENOENT (No such file or directory) open("/lib/tls/i686/sse2/libutil.so.1", O_RDONLY) = -1 ENOENT (No such file or directory) stat64("/lib/tls/i686/sse2", 0xafd0d548) = -1 ENOENT (No such file or directory) open("/lib/tls/i686/cmov/libutil.so.1", O_RDONLY) = 3 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\260\f\0"..., 512) = 512 fstat64(3, {st_mode=S_IFREG|0644, st_size=9656, ...}) = 0 mmap2(NULL, 12432, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xa7efa000 mmap2(0xa7efc000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1) = 0xa7efc000 close(3) = 0 open("/lib/tls/i686/cmov/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240O\1"..., 512) = 512 fstat64(3, {st_mode=S_IFREG|0644, st_size=1241580, ...}) = 0 mmap2(NULL, 1247388, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xa7dc9000 mmap2(0xa7ef0000, 28672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x127) = 0xa7ef0000 mmap2(0xa7ef7000, 10396, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xa7ef7000 close(3) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xa7dc8000 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xa7dc7000 mprotect(0xa7ef0000, 20480, PROT_READ) = 0 set_thread_area({entry_number:-1 -> 6, base_addr:0xa7dc76c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0 getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0 brk(0) = 0x8275000 brk(0x8296000) = 0x8296000 rt_sigaction(SIGINT, {0x806364c, [], SA_NOMASK|SA_ONESHOT}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [INT], NULL, 8) = 0 rt_sigaction(SIGTERM, {0x806364c, [], SA_NOMASK|SA_ONESHOT}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [TERM], NULL, 8) = 0 rt_sigaction(SIGHUP, {0x806364c, [], SA_NOMASK|SA_ONESHOT}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [HUP], NULL, 8) = 0 fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xa7dc6000 mmap2(NULL, 4096, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xa7dc5000 clone(Process 18247 attached child_stack=0xa7dc5fd4, flags=|SIGCHLD) = 18247 [pid 18246] waitpid(18247, Process 18246 suspended <unfinished ...> [pid 18247] getpid() = 18247 [pid 18247] getppid() = 18246 [pid 18247] rt_sigprocmask(SIG_BLOCK, [WINCH], [], 8) = 0 [pid 18247] ptrace(PTRACE_TRACEME, 0, 0, 0) = -1 EPERM (Operation not permitted) [pid 18247] dup(2) = 3 [pid 18247] fcntl64(3, F_GETFL) = 0x2 (flags O_RDWR) [pid 18247] fstat64(3, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0 [pid 18247] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xa7dc4000 [pid 18247] _llseek(3, 0, 0xa7dc5a50, SEEK_CUR) = -1 ESPIPE (Illegal seek) [pid 18247] write(3, "ptrace: Operation not permitted\n", 32ptrace: Operation not permitted ) = 32 [pid 18247] close(3) = 0 [pid 18247] munmap(0xa7dc4000, 4096) = 0 [pid 18247] kill(18247, SIGKILL) = 0 [pid 18247] +++ killed by SIGKILL +++ Process 18246 resumed Process 18247 detached <... waitpid resumed> [{WIFSIGNALED(s) && WTERMSIG(s) == SIGKILL}], WSTOPPED) = 18247 --- SIGCHLD (Child exited) @ 0 (0) --- }}} Thanx -- Pravin Shinde ------------------------------------------------------------------------- Take Surveys. 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