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SubjectRe: Oops+Panic report - quite long
hi,

I added the patch (manually, since patch failed).
But I get a core dump when I do insmod.
I am listing the gdb output of insmod.

[root@linpqs /home/rajukv/driver]# insmod driver.o
Segmentation fault
[root@linpqs /home/rajukv/driver]# gdb insmod
GNU gdb 4.17.0.4 with Linux/x86 hardware watchpoint and FPU support
Copyright 1998 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux"...
(gdb) r driver.o
Starting program: /sbin/insmod driver.o

Program received signal SIGSEGV, Segmentation fault.
0x804dac9 in obj_add_symbol (f=0x805d068, name=0x80522f3 "__this_module",
symidx=4294967295, info=1, secidx=12, value=0, size=76) at obj_common.c:171
171 f->local_symtab[symidx] = sym;
(gdb) b obj_add_symbol
Breakpoint 1 at 0x804d94d: file obj_common.c, line 94.
(gdb) r
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /sbin/insmod driver.o

Breakpoint 1, obj_add_symbol (f=0x805d068, name=0x80522f3 "__this_module",
symidx=4294967295, info=1, secidx=12, value=0, size=76) at obj_common.c:94
94 unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS;
(gdb) n
95 int n_type = ELFW(ST_TYPE)(info);
(gdb)
96 int n_binding = ELFW(ST_BIND)(info);
(gdb)
98 for (sym = f->symtab[hash]; sym; sym = sym->next)
(gdb)
165 sym = arch_new_symbol();
(gdb)
166 sym->next = f->symtab[hash];
(gdb)
167 f->symtab[hash] = sym;
(gdb)
168 sym->ksymidx = -1;
(gdb)
170 if (ELFW(ST_BIND)(info) == STB_LOCAL)
(gdb)
171 f->local_symtab[symidx] = sym;
(gdb)
Program received signal SIGSEGV, Segmentation fault.
0x804dac9 in obj_add_symbol (f=0x805d068, name=0x80522f3 "__this_module",
symidx=4294967295, info=1, secidx=12, value=0, size=76) at obj_common.c:171
171 f->local_symtab[symidx] = sym;
(gdb) q
The program is running. Exit anyway? (y or n) y

insmod -V
insmod version 2.2.2-pre6
Usage:
insmod [-fkmopsvVxXyY] [-o name] [-P prefix] module [[sym=value]...]

module Filename of a loadable kernel module (*.o)
-f, --force Force loading under wrong kernel version
-k, --autoclean Make module autoclean-able
-m, --map Generate load map (so crashes can be traced)
-n, --noload Don't load, just show
-o NAME, --name=NAME Set internal module name to NAME
-p, --poll Poll mode; check if the module matches the
kernel
-s, --syslog Report errors via syslog
-v, --verbose Verbose output
-L, --lock Prevent simultaneous loads of the same module
-V, --version Show version
-x Do not export externs
-X Do export externs (default)
-y Do not add ksymoops symbols
-Y Do add ksymoops symbols (default)
-P PREFIX
--prefix=PREFIX Prefix for kernel or module symbols

Thanks in advance,
Raju

On Sat, Nov 27, 1999 at 04:36:19AM +1100, Keith Owens [kaos@ocs.com.au] wrote:
> On Fri, 26 Nov 1999 17:57:35 +0530,
> Raju K V <rajukv@wipinfo.soft.net> wrote:
> >While loading my SCSI HBA driver with
> >insmod driver.o
> >I get the foll never ending Oops+panic. Here is the ksymoops o/p:
> >No modules in ksyms, skipping objects
> >EIP: 0010:[<c281832d>]
> >>>EIP; c281832d <END_OF_CODE+25e7629/????> <=====
>
> When modules fail during initialization they are left in limbo. The
> module is loaded, symbols are stored, dependencies are logged but the
> kernel refuses to let programs query the module because it is not
> marked as running yet. Apply this patch against 2.2.10 and you will be
> able to get symbols for modules that fail during initialization.
> Reproduce the problem, feed the new log through ksymoops and you should
> get symbols this time.
>
> Index: 10.1/kernel/module.c
> --- 10.1/kernel/module.c Fri, 05 Feb 1999 09:47:48 +1100 keith (linux-2.2/h/18_module.c 1.1 644)
> +++ 10.1(w)/kernel/module.c Sat, 27 Nov 1999 04:29:01 +1100 keith (linux-2.2/h/18_module.c 1.1 644)
> @@ -13,6 +13,7 @@
> * 0.99.14 version by Jon Tombs <jon@gtex02.us.es>,
> * Heavily modified by Bjorn Ekwall <bj0rn@blox.se> May 1994 (C)
> * Rewritten by Richard Henderson <rth@tamu.edu> Dec 1996
> + * Add MOD_INITIALIZING Keith Owens <kaos@ocs.com.au> Nov 1999
> *
> * This source is covered by the GNU GPL, the same as all kernel sources.
> */
> @@ -329,16 +330,18 @@
> put_mod_name(name);
>
> /* Initialize the module. */
> + mod->flags |= MOD_INITIALIZING;
> atomic_set(&mod->uc.usecount,1);
> if (mod->init && mod->init() != 0) {
> atomic_set(&mod->uc.usecount,0);
> + mod->flags &= ~MOD_INITIALIZING;
> error = -EBUSY;
> goto err0;
> }
> atomic_dec(&mod->uc.usecount);
>
> /* And set it running. */
> - mod->flags |= MOD_RUNNING;
> + mod->flags = (mod->flags | MOD_RUNNING) & ~MOD_INITIALIZING;
> error = 0;
> goto err0;
>
> @@ -462,7 +465,7 @@
>
> if (mod == &kernel_module)
> return -EINVAL;
> - if ((mod->flags & (MOD_RUNNING | MOD_DELETED)) != MOD_RUNNING)
> + if (!MOD_CAN_QUERY(mod))
> if (put_user(0, ret))
> return -EFAULT;
> else
> @@ -506,7 +509,7 @@
>
> if (mod == &kernel_module)
> return -EINVAL;
> - if ((mod->flags & (MOD_RUNNING | MOD_DELETED)) != MOD_RUNNING)
> + if (!MOD_CAN_QUERY(mod))
> if (put_user(0, ret))
> return -EFAULT;
> else
> @@ -550,7 +553,7 @@
> char *strings;
> unsigned long *vals;
>
> - if ((mod->flags & (MOD_RUNNING | MOD_DELETED)) != MOD_RUNNING)
> + if (!MOD_CAN_QUERY(mod))
> if (put_user(0, ret))
> return -EFAULT;
> else
> @@ -716,7 +719,7 @@
> struct module_symbol *msym;
> unsigned int j;
>
> - if ((mod->flags & (MOD_RUNNING|MOD_DELETED)) != MOD_RUNNING)
> + if (!MOD_CAN_QUERY(mod))
> continue;
>
> /* magic: write module info as a pseudo symbol */
> @@ -865,7 +868,10 @@
> safe_copy_cstr(" (autoclean)");
> if (!(mod->flags & MOD_USED_ONCE))
> safe_copy_cstr(" (unused)");
> - } else
> + }
> + else if (mod->flags & MOD_INITIALIZING)
> + safe_copy_cstr(" (initializing)");
> + else
> safe_copy_cstr(" (uninitialized)");
>
> if ((ref = mod->refs) != NULL) {
> @@ -909,7 +915,7 @@
> unsigned i;
> struct module_symbol *sym;
>
> - if (!(mod->flags & MOD_RUNNING) || (mod->flags & MOD_DELETED))
> + if (!MOD_CAN_QUERY(mod))
> continue;
>
> for (i = mod->nsyms, sym = mod->syms; i > 0; --i, ++sym) {
> @@ -957,7 +963,7 @@
>
> for (mp = module_list; mp; mp = mp->next) {
> if (((modname == NULL) || (strcmp(mp->name, modname) == 0)) &&
> - (mp->flags & (MOD_RUNNING | MOD_DELETED)) == MOD_RUNNING &&
> + MOD_CAN_QUERY(mp) &&
> (mp->nsyms > 0)) {
> for (i = mp->nsyms, sym = mp->syms;
> i > 0; --i, ++sym) {
> Index: 10.1/include/linux/module.h
> --- 10.1/include/linux/module.h Fri, 05 Feb 1999 09:47:48 +1100 keith (linux-2.2/F/51_module.h 1.1 644)
> +++ 10.1(w)/include/linux/module.h Sat, 27 Nov 1999 04:29:01 +1100 keith (linux-2.2/F/51_module.h 1.1 644)
> @@ -101,6 +101,7 @@
> #define MOD_VISITED 8
> #define MOD_USED_ONCE 16
> #define MOD_JUST_FREED 32
> +#define MOD_INITIALIZING 64
>
> /* Values for query_module's which. */
>
> @@ -109,6 +110,9 @@
> #define QM_REFS 3
> #define QM_SYMBOLS 4
> #define QM_INFO 5
> +
> +/* Can the module be queried? */
> +#define MOD_CAN_QUERY(mod) (((mod)->flags & (MOD_RUNNING | MOD_INITIALIZING)) && !((mod)->flags & MOD_DELETED))
>
> /* When struct module is extended, we must test whether the new member
> is present in the header received from insmod before we can use it.
> Index: 10.1/arch/sparc64/kernel/sys_sparc32.c
> --- 10.1/arch/sparc64/kernel/sys_sparc32.c Mon, 14 Jun 1999 17:28:27 +1000 keith (linux-2.2/r/b/30_sys_sparc3 1.3 644)
> +++ 10.1(w)/arch/sparc64/kernel/sys_sparc32.c Sat, 27 Nov 1999 04:29:01 +1100 keith (linux-2.2/r/b/30_sys_sparc3 1.3 644)
> @@ -3034,7 +3034,7 @@
>
> if (mod->next == NULL)
> return -EINVAL;
> - if ((mod->flags & (MOD_RUNNING | MOD_DELETED)) != MOD_RUNNING)
> + if (!MOD_CAN_QUERY(mod))
> if (put_user(0, ret))
> return -EFAULT;
> else
> @@ -3078,7 +3078,7 @@
>
> if (mod->next == NULL)
> return -EINVAL;
> - if ((mod->flags & (MOD_RUNNING | MOD_DELETED)) != MOD_RUNNING)
> + if (!MOD_CAN_QUERY(mod))
> if (put_user(0, ret))
> return -EFAULT;
> else
> @@ -3122,7 +3122,7 @@
> char *strings;
> unsigned *vals;
>
> - if ((mod->flags & (MOD_RUNNING | MOD_DELETED)) != MOD_RUNNING)
> + if (!MOD_CAN_QUERY(mod))
> if (put_user(0, ret))
> return -EFAULT;
> else

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