On Monday 21 November 2005 08:58, Jeff Dike wrote:
> On Sat, Nov 19, 2005 at 02:11:50PM +0100, Joel Palmius wrote:
> > * SKAS0 mode, crash:
...
> > Kernel panic - not syncing: copy_context_skas0 : failed to wait for
> > SIGUSR1/SIGTRAP, pid = 11008, n = 11008, errno = 0, status = 0xb7f
>
> Can you send a disassembly of stub_clone_handler?
>
> Jeff
I'll see this crash and raise you. I just tried vanilla 2.6.15-rc2, and
although it booted to a shell it crashed with the first command I ran. (This
is my x86 laptop, built under ubuntu with gcc 3.3.5). Dump and
dissassemblies follow.
[EMAIL PROTECTED]:~/linux-2.6.15-rc2$ ./linux rootfstype=hostfs rw
init=/bin/sh
Checking PROT_EXEC mmap in /tmp...OK
Checking for the skas3 patch in the host:
- /proc/mm...not found
- PTRACE_FAULTINFO...not found
- PTRACE_LDT...not found
UML running in SKAS0 mode
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...missing
Linux version 2.6.15-rc2 ([EMAIL PROTECTED]) (gcc version 3.3.5 (Debian
1:3.3.5-8ubuntu2)) #1 Mon Nov 21 10:31:26 CST 2005
Built 1 zonelists
Kernel command line: rootfstype=hostfs rw init=/bin/sh 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: 30592k available
Mount-cache hash table entries: 512
Checking for host processor cmov support...Yes
Checking for host processor xmm support...No
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)
Linux NoNET1.0 for Linux 2.6
Using 2.6 host AIO
io scheduler noop registered
loop: loaded (max 8 devices)
Initialized stdio console driver
Console initialized on /dev/tty0
Failed to open 'root_fs', errno = 2
VFS: Mounted root (hostfs filesystem).
idr_remove called for id=5 which is not allocated.
088a7998: [<080fa62f>] sub_remove+0xef/0x100
088a79d8: [<080fa66f>] idr_remove+0x2f/0xc0
088a79f0: [<081030b2>] release_dev+0x5e2/0x700
088a7a60: [<08102585>] init_dev+0x1b5/0x590
088a7aac: [<0810333c>] tty_open+0x16c/0x3a0
088a7ac0: [<080bbe50>] vfs_permission+0x20/0x30
088a7ad0: [<080fad7a>] kobject_get+0x1a/0x30
088a7adc: [<080b749f>] cdev_get+0xf/0x20
088a7ae4: [<080b768f>] exact_lock+0xf/0x20
088a7b08: [<081031d0>] tty_open+0x0/0x3a0
088a7b10: [<080b756e>] chrdev_open+0x9e/0x140
088a7b30: [<080b74d0>] chrdev_open+0x0/0x140
088a7b34: [<080accd0>] __dentry_open+0x90/0x190
088a7b50: [<080acf18>] nameidata_to_filp+0x38/0x50
088a7b6c: [<080ace24>] filp_open+0x54/0x60
088a7b90: [<08060b00>] strncpy_chunk_from_user+0x0/0x80
088a7bb0: [<080ad00c>] get_unused_fd+0x6c/0xc0
088a7bd8: [<080ad149>] do_sys_open+0x49/0x90
088a7bf4: [<080601dc>] handle_syscall+0xec/0x100
088a7bf8: [<080ec008>] ext2_put_super+0x78/0xb0
088a7c14: [<080ec008>] ext2_put_super+0x78/0xb0
088a7c34: [<080ec008>] ext2_put_super+0x78/0xb0
088a7c64: [<0805eaa8>] handle_trap+0x28/0x130
088a7c8c: [<0805f114>] userspace+0x1c4/0x220
088a7cd8: [<08055f50>] init+0x0/0x170
088a7ce4: [<0805fbf2>] new_thread_handler+0xf2/0x130
sh-3.00# ls -l
Stub registers -
0 - bffff000
1 - 1000
2 - 3
3 - 11
4 - bffff000
5 - 0
6 - bffff000
7 - 7b
8 - 7b
9 - 0
10 - 33
11 - ffffffff
12 - bfffe08d
13 - 73
14 - 210246
15 - bffff7fc
16 - 7b
Kernel panic - not syncing: copy_context_skas0 : failed to wait for
SIGUSR1/SIGTRAP, pid = 16739, n = 16739, errno = 0, status = 0xb7f
EIP: 0073:[<ffffe410>] CPU: 0 Not tainted ESP: 007b:bfad8780 EFLAGS: 00200206
Not tainted
EAX: ffffffda EBX: 01200011 ECX: 00000000 EDX: 00000000
ESI: 00000000 EDI: 401922e8 EBP: bfad87d8 DS: 007b ES: 007b
088a787c: [<08080b7d>] notifier_call_chain+0x2d/0x50
088a7898: [<08071411>] panic+0x71/0x110
088a78b0: [<0805e8f0>] wait_stub_done+0x100/0x190
088a791c: [<0806bc25>] ptrace_setregs+0x25/0x40
088a7930: [<0805f320>] copy_context_skas0+0x1b0/0x270
088a7a0c: [<0805e68a>] init_new_context_skas+0x11a/0x1a0
088a7a3c: [<0806f872>] copy_mm+0xd2/0x380
088a7a80: [<08070455>] copy_process+0x415/0xda0
088a7aa0: [<0805dcb3>] setjmp_wrapper+0x83/0x90
088a7ac4: [<0805dc67>] setjmp_wrapper+0x37/0x90
088a7ae4: [<0805a745>] change_signals+0x65/0x90
088a7b60: [<08070e4f>] do_fork+0x6f/0x1cc
088a7b80: [<0807f5b4>] kernel_sigprocmask+0x64/0x140
088a7b90: [<08060ae6>] copy_to_user_skas+0x86/0xa0
088a7ba0: [<08060a20>] copy_chunk_to_user+0x0/0x40
088a7bc8: [<0806ce89>] sys_clone+0x79/0xa0
088a7bf4: [<080601dc>] handle_syscall+0xec/0x100
088a7c64: [<0805eaa8>] handle_trap+0x28/0x130
088a7c8c: [<0805f114>] userspace+0x1c4/0x220
088a7cd8: [<08055f50>] init+0x0/0x170
088a7ce4: [<0805fbf2>] new_thread_handler+0xf2/0x130
08113000 <stub_clone_handler>:
8113000: 83 ec 14 sub $0x14,%esp
8113003: ba 78 00 00 00 mov $0x78,%edx
8113008: b9 fc f7 ff bf mov $0xbffff7fc,%ecx
811300d: 89 5c 24 04 mov %ebx,0x4(%esp)
8113011: 89 d0 mov %edx,%eax
8113013: bb 11 84 00 00 mov $0x8411,%ebx
8113018: 89 6c 24 10 mov %ebp,0x10(%esp)
811301c: bd 00 f0 ff bf mov $0xbffff000,%ebp
8113021: 89 74 24 08 mov %esi,0x8(%esp)
8113025: 89 7c 24 0c mov %edi,0xc(%esp)
8113029: cd 80 int $0x80
811302b: 85 c0 test %eax,%eax
811302d: 89 c7 mov %eax,%edi
811302f: 75 5c jne 811308d
<stub_clone_handler+0x8d>
8113031: b8 1a 00 00 00 mov $0x1a,%eax
8113036: 89 fb mov %edi,%ebx
8113038: 89 f9 mov %edi,%ecx
811303a: 89 fa mov %edi,%edx
811303c: 89 fe mov %edi,%esi
811303e: cd 80 int $0x80
8113040: 85 c0 test %eax,%eax
8113042: 89 c7 mov %eax,%edi
8113044: 75 47 jne 811308d
<stub_clone_handler+0x8d>
8113046: be 68 00 00 00 mov $0x68,%esi
811304b: bb 01 00 00 00 mov $0x1,%ebx
8113050: b9 08 f0 ff bf mov $0xbffff008,%ecx
8113055: 89 f0 mov %esi,%eax
8113057: 89 fa mov %edi,%edx
8113059: cd 80 int $0x80
811305b: 85 c0 test %eax,%eax
811305d: 89 c7 mov %eax,%edi
811305f: 75 2c jne 811308d
<stub_clone_handler+0x8d>
8113061: 8b 1d 00 f0 ff bf mov 0xbffff000,%ebx
8113067: b9 00 10 00 00 mov $0x1000,%ecx
811306c: ba 03 00 00 00 mov $0x3,%edx
8113071: be 11 00 00 00 mov $0x11,%esi
8113076: 8b 3d 04 f0 ff bf mov 0xbffff004,%edi
811307c: 89 d8 mov %ebx,%eax
811307e: 89 eb mov %ebp,%ebx
8113080: 55 push %ebp
8113081: 89 c5 mov %eax,%ebp
8113083: b8 c0 00 00 00 mov $0xc0,%eax
8113088: cd 80 int $0x80
811308a: 5d pop %ebp
811308b: 89 c7 mov %eax,%edi
811308d: 89 7d 18 mov %edi,0x18(%ebp)
8113090: cc int3
8113091: 8b 5c 24 04 mov 0x4(%esp),%ebx
8113095: 8b 74 24 08 mov 0x8(%esp),%esi
8113099: 8b 7c 24 0c mov 0xc(%esp),%edi
811309d: 8b 6c 24 10 mov 0x10(%esp),%ebp
81130a1: 83 c4 14 add $0x14,%esp
81130a4: c3 ret
81130a5: 90 nop
81130a6: 90 nop
81130a7: 90 nop
81130a8: 90 nop
81130a9: 90 nop
81130aa: 90 nop
81130ab: 90 nop
81130ac: 90 nop
81130ad: 90 nop
81130ae: 90 nop
81130af: 90 nop
081130b0 <stub_segv_handler>:
81130b0: 8b 44 24 5c mov 0x5c(%esp),%eax
81130b4: 8d 54 24 08 lea 0x8(%esp),%edx
81130b8: a3 04 f0 ff bf mov %eax,0xbffff004
81130bd: 8b 44 24 3c mov 0x3c(%esp),%eax
81130c1: a3 00 f0 ff bf mov %eax,0xbffff000
81130c6: 8b 44 24 38 mov 0x38(%esp),%eax
81130ca: a3 08 f0 ff bf mov %eax,0xbffff008
81130cf: b8 14 00 00 00 mov $0x14,%eax
81130d4: cd 80 int $0x80
81130d6: 89 c3 mov %eax,%ebx
81130d8: b8 25 00 00 00 mov $0x25,%eax
81130dd: b9 0a 00 00 00 mov $0xa,%ecx
81130e2: cd 80 int $0x80
81130e4: 89 d0 mov %edx,%eax
81130e6: 89 c4 mov %eax,%esp
81130e8: b8 77 00 00 00 mov $0x77,%eax
81130ed: cd 80 int $0x80
81130ef: c3 ret
Rob
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