4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2013, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * libcfs/libcfs/linux/linux-debug.c
34 * Author: Phil Schwan <phil@clusterfs.com>
37 #include <linux/module.h>
38 #include <linux/kmod.h>
39 #include <linux/notifier.h>
40 #include <linux/kernel.h>
42 #include <linux/string.h>
43 #include <linux/stat.h>
44 #include <linux/errno.h>
45 #ifdef HAVE_KERNEL_LOCKED
46 #include <linux/smp_lock.h>
48 #include <linux/unistd.h>
49 #include <linux/interrupt.h>
50 #include <asm/uaccess.h>
51 #include <linux/completion.h>
54 #include <linux/stat.h>
55 #include <asm/uaccess.h>
56 #include <linux/miscdevice.h>
57 #include <linux/version.h>
59 # define DEBUG_SUBSYSTEM S_LNET
61 #include <libcfs/libcfs.h>
63 #include "tracefile.h"
65 #include <linux/kallsyms.h>
67 char lnet_upcall[1024] = "/usr/lib/lustre/lnet_upcall";
68 char lnet_debug_log_upcall[1024] = "/usr/lib/lustre/lnet_debug_log_upcall";
71 * Upcall function once a Lustre log has been dumped.
73 * \param file path of the dumped log
75 void libcfs_run_debug_log_upcall(char *file)
81 "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
85 argv[0] = lnet_debug_log_upcall;
87 LASSERTF(file != NULL, "called on a null filename\n");
88 argv[1] = file; //only need to pass the path of the file
92 rc = call_usermodehelper(argv[0], argv, envp, 1);
93 if (rc < 0 && rc != -ENOENT) {
94 CERROR("Error %d invoking LNET debug log upcall %s %s; "
95 "check /proc/sys/lnet/debug_log_upcall\n",
96 rc, argv[0], argv[1]);
98 CDEBUG(D_HA, "Invoked LNET debug log upcall %s %s\n",
105 void libcfs_run_upcall(char **argv)
111 "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
115 argv[0] = lnet_upcall;
117 while (argv[argc] != NULL)
122 rc = call_usermodehelper(argv[0], argv, envp, 1);
123 if (rc < 0 && rc != -ENOENT) {
124 CERROR("Error %d invoking LNET upcall %s %s%s%s%s%s%s%s%s; "
125 "check /proc/sys/lnet/upcall\n",
126 rc, argv[0], argv[1],
127 argc < 3 ? "" : ",", argc < 3 ? "" : argv[2],
128 argc < 4 ? "" : ",", argc < 4 ? "" : argv[3],
129 argc < 5 ? "" : ",", argc < 5 ? "" : argv[4],
130 argc < 6 ? "" : ",...");
132 CDEBUG(D_HA, "Invoked LNET upcall %s %s%s%s%s%s%s%s%s\n",
134 argc < 3 ? "" : ",", argc < 3 ? "" : argv[2],
135 argc < 4 ? "" : ",", argc < 4 ? "" : argv[3],
136 argc < 5 ? "" : ",", argc < 5 ? "" : argv[4],
137 argc < 6 ? "" : ",...");
141 void libcfs_run_lbug_upcall(struct libcfs_debug_msg_data *msgdata)
147 snprintf (buf, sizeof buf, "%d", msgdata->msg_line);
150 argv[2] = (char *)msgdata->msg_file;
151 argv[3] = (char *)msgdata->msg_fn;
155 libcfs_run_upcall (argv);
157 EXPORT_SYMBOL(libcfs_run_lbug_upcall);
159 /* coverity[+kill] */
160 void lbug_with_loc(struct libcfs_debug_msg_data *msgdata)
162 libcfs_catastrophe = 1;
163 libcfs_debug_msg(msgdata, "LBUG\n");
165 if (in_interrupt()) {
166 panic("LBUG in interrupt.\n");
170 libcfs_debug_dumpstack(NULL);
171 if (!libcfs_panic_on_lbug)
172 libcfs_debug_dumplog();
173 libcfs_run_lbug_upcall(msgdata);
174 if (libcfs_panic_on_lbug)
176 set_task_state(current, TASK_UNINTERRUPTIBLE);
180 EXPORT_SYMBOL(lbug_with_loc);
183 #include <linux/nmi.h>
184 #include <asm/stacktrace.h>
186 #ifdef HAVE_STACKTRACE_WARNING
188 print_trace_warning_symbol(void *data, char *msg, unsigned long symbol)
190 printk("%s", (char *)data);
191 print_symbol(msg, symbol);
195 static void print_trace_warning(void *data, char *msg)
197 printk("%s%s\n", (char *)data, msg);
201 static int print_trace_stack(void *data, char *name)
203 printk(" <%s> ", name);
207 #ifdef STACKTRACE_OPS_ADDRESS_RETURN_INT
212 print_trace_address(void *data, unsigned long addr, int reliable)
216 touch_nmi_watchdog();
217 sprintf(fmt, " [<%016lx>] %s%%s\n", addr, reliable ? "": "? ");
218 __print_symbol(fmt, addr);
219 #ifdef STACKTRACE_OPS_ADDRESS_RETURN_INT
224 static const struct stacktrace_ops print_trace_ops = {
225 #ifdef HAVE_STACKTRACE_WARNING
226 .warning = print_trace_warning,
227 .warning_symbol = print_trace_warning_symbol,
229 .stack = print_trace_stack,
230 .address = print_trace_address,
231 #ifdef STACKTRACE_OPS_HAVE_WALK_STACK
232 .walk_stack = print_context_stack,
236 static void libcfs_call_trace(struct task_struct *tsk)
238 dump_trace(tsk, NULL, NULL,
239 #ifdef HAVE_DUMP_TRACE_ADDRESS
241 #endif /* HAVE_DUMP_TRACE_ADDRESS */
242 &print_trace_ops, NULL);
246 #else /* !CONFIG_X86 */
248 static void libcfs_call_trace(struct task_struct *tsk)
250 if ((tsk == NULL) || (tsk == current))
253 CWARN("can't show stack: kernel doesn't export show_task\n");
256 #endif /* CONFIG_X86 */
258 void libcfs_debug_dumpstack(struct task_struct *tsk)
264 printk("Pid: %d, comm: %.20s\n", tsk->pid, tsk->comm);
265 /* show_trace_log_lvl() */
266 printk("\nCall Trace:\n");
267 libcfs_call_trace(tsk);
269 EXPORT_SYMBOL(libcfs_debug_dumpstack);
271 struct task_struct *libcfs_current(void)
273 CWARN("current task struct is %p\n", current);
277 static int panic_notifier(struct notifier_block *self, unsigned long unused1,
280 if (libcfs_panic_in_progress)
283 libcfs_panic_in_progress = 1;
286 #ifdef LNET_DUMP_ON_PANIC
287 /* This is currently disabled because it spews far too much to the
288 * console on the rare cases it is ever triggered. */
290 if (in_interrupt()) {
291 cfs_trace_debug_print();
293 #ifdef HAVE_KERNEL_LOCKED
294 while (kernel_locked())
297 libcfs_debug_dumplog_internal((void *)(long)current_pid());
303 static struct notifier_block libcfs_panic_notifier = {
304 notifier_call : panic_notifier,
309 void libcfs_register_panic_notifier(void)
311 atomic_notifier_chain_register(&panic_notifier_list, &libcfs_panic_notifier);
314 void libcfs_unregister_panic_notifier(void)
316 atomic_notifier_chain_unregister(&panic_notifier_list, &libcfs_panic_notifier);