-/*
- * GPL HEADER START
- *
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License version 2 for more details (a copy is included
- * in the LICENSE file that accompanied this code).
- *
- * You should have received a copy of the GNU General Public License
- * version 2 along with this program; If not, see
- * http://www.gnu.org/licenses/gpl-2.0.html
- *
- * GPL HEADER END
- */
-/*
- * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
- * Use is subject to license terms.
- *
- * Copyright (c) 2012, 2017, Intel Corporation.
- */
-/*
- * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
- *
- * libcfs/libcfs/linux/linux-debug.c
- *
- * Author: Phil Schwan <phil@clusterfs.com>
- */
-
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/kallsyms.h>
-#include <linux/kmod.h>
-#include <linux/module.h>
-#include <linux/notifier.h>
-#include <linux/string.h>
-#include <linux/unistd.h>
-#include <linux/stacktrace.h>
-#include <linux/utsname.h>
-
-# define DEBUG_SUBSYSTEM S_LNET
-
-#include <libcfs/libcfs.h>
-
-#include "tracefile.h"
-
-char lnet_debug_log_upcall[1024] = "/usr/lib/lustre/lnet_debug_log_upcall";
-
-/**
- * Upcall function once a Lustre log has been dumped.
- *
- * \param file path of the dumped log
- */
-void libcfs_run_debug_log_upcall(char *file)
-{
- char *argv[3];
- int rc;
- char *envp[] = {
- "HOME=/",
- "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
- NULL};
- ENTRY;
-
- argv[0] = lnet_debug_log_upcall;
-
- LASSERTF(file != NULL, "called on a null filename\n");
- argv[1] = file; //only need to pass the path of the file
-
- argv[2] = NULL;
-
- rc = call_usermodehelper(argv[0], argv, envp, 1);
- if (rc < 0 && rc != -ENOENT) {
- CERROR("Error %d invoking LNET debug log upcall %s %s; "
- "check /proc/sys/lnet/debug_log_upcall\n",
- rc, argv[0], argv[1]);
- } else {
- CDEBUG(D_HA, "Invoked LNET debug log upcall %s %s\n",
- argv[0], argv[1]);
- }
-
- EXIT;
-}
-
-/* coverity[+kill] */
-void lbug_with_loc(struct libcfs_debug_msg_data *msgdata)
-{
- libcfs_catastrophe = 1;
- libcfs_debug_msg(msgdata, "LBUG\n");
-
- if (in_interrupt()) {
- panic("LBUG in interrupt.\n");
- /* not reached */
- }
-
- libcfs_debug_dumpstack(NULL);
- if (libcfs_panic_on_lbug)
- panic("LBUG");
- else
- libcfs_debug_dumplog();
- set_current_state(TASK_UNINTERRUPTIBLE);
- while (1)
- schedule();
-}
-EXPORT_SYMBOL(lbug_with_loc);
-
-#ifdef CONFIG_STACKTRACE
-
-#ifndef HAVE_SAVE_STACK_TRACE_TSK
-#define save_stack_trace_tsk(tsk, trace) \
-do { \
- if (tsk == current) \
- save_stack_trace(trace); \
- else \
- pr_info("No stack, save_stack_trace_tsk() not exported\n"); \
-} while (0)
-#endif
-
-#define MAX_ST_ENTRIES 100
-static DEFINE_SPINLOCK(st_lock);
-
-/*
- * Linux v5.1-rc5 214d8ca6ee ("stacktrace: Provide common infrastructure")
- * CONFIG_ARCH_STACKWALK indicates that save_stack_trace_tsk symbol is not
- * exported. Use symbol_get() to find if save_stack_trace_tsk is available.
- */
-#ifdef CONFIG_ARCH_STACKWALK
-typedef unsigned int (stack_trace_save_tsk_t)(struct task_struct *task,
- unsigned long *store, unsigned int size,
- unsigned int skipnr);
-static stack_trace_save_tsk_t *task_dump_stack;
-#endif
-
-static void libcfs_call_trace(struct task_struct *tsk)
-{
-#ifdef CONFIG_ARCH_STACKWALK
- static unsigned long entries[MAX_ST_ENTRIES];
- unsigned int i, nr_entries;
-
- if (!task_dump_stack)
- task_dump_stack = (stack_trace_save_tsk_t *)
- symbol_get("stack_trace_save_tsk");
-
- spin_lock(&st_lock);
- pr_info("Pid: %d, comm: %.20s %s %s\n", tsk->pid, tsk->comm,
- init_utsname()->release, init_utsname()->version);
- pr_info("Call Trace TBD:\n");
- if (task_dump_stack) {
- nr_entries = task_dump_stack(tsk, entries, MAX_ST_ENTRIES, 0);
- for (i = 0; i < nr_entries; i++)
- pr_info("[<0>] %pB\n", (void *)entries[i]);
- }
- spin_unlock(&st_lock);
-#else
- struct stack_trace trace;
- static unsigned long entries[MAX_ST_ENTRIES];
-
- trace.nr_entries = 0;
- trace.max_entries = MAX_ST_ENTRIES;
- trace.entries = entries;
- trace.skip = 0;
-
- spin_lock(&st_lock);
- pr_info("Pid: %d, comm: %.20s %s %s\n", tsk->pid, tsk->comm,
- init_utsname()->release, init_utsname()->version);
- pr_info("Call Trace:\n");
- save_stack_trace_tsk(tsk, &trace);
- print_stack_trace(&trace, 0);
- spin_unlock(&st_lock);
-#endif
-}
-
-#else /* !CONFIG_STACKTRACE */
-
-#ifdef CONFIG_X86
-#include <linux/nmi.h>
-#include <asm/stacktrace.h>
-
-#ifdef HAVE_STACKTRACE_OPS
-static int print_trace_stack(void *data, char *name)
-{
- printk(" <%s> ", name);
- return 0;
-}
-
-#ifdef STACKTRACE_OPS_ADDRESS_RETURN_INT
-static int
-#else
-static void
-#endif
-print_trace_address(void *data, unsigned long addr, int reliable)
-{
- char fmt[32];
-
- touch_nmi_watchdog();
- sprintf(fmt, " [<%016lx>] %s%%s\n", addr, reliable ? "": "? ");
- __print_symbol(fmt, addr);
-#ifdef STACKTRACE_OPS_ADDRESS_RETURN_INT
- return 0;
-#endif
-}
-
-static const struct stacktrace_ops print_trace_ops = {
- .stack = print_trace_stack,
- .address = print_trace_address,
- .walk_stack = print_context_stack,
-};
-#endif /* HAVE_STACKTRACE_OPS */
-
-static void libcfs_call_trace(struct task_struct *tsk)
-{
-#ifdef HAVE_STACKTRACE_OPS
- printk("Pid: %d, comm: %.20s\n", tsk->pid, tsk->comm);
- printk("\nCall Trace:\n");
- dump_trace(tsk, NULL, NULL, 0, &print_trace_ops, NULL);
- printk("\n");
-#else /* !HAVE_STACKTRACE_OPS */
- if (tsk == current)
- dump_stack();
- else
- CWARN("can't show stack: kernel doesn't export show_task\n");
-#endif /* HAVE_STACKTRACE_OPS */
-}
-
-#else /* !CONFIG_X86 */
-
-static void libcfs_call_trace(struct task_struct *tsk)
-{
- if (tsk == current)
- dump_stack();
- else
- CWARN("can't show stack: kernel doesn't export show_task\n");
-}
-
-#endif /* CONFIG_X86 */
-
-#endif /* CONFIG_STACKTRACE */
-
-void libcfs_debug_dumpstack(struct task_struct *tsk)
-{
- libcfs_call_trace(tsk ?: current);
-}
-EXPORT_SYMBOL(libcfs_debug_dumpstack);
-
-static int panic_notifier(struct notifier_block *self, unsigned long unused1,
- void *unused2)
-{
- if (libcfs_panic_in_progress)
- return 0;
-
- libcfs_panic_in_progress = 1;
- mb();
-
-#ifdef LNET_DUMP_ON_PANIC
- /* This is currently disabled because it spews far too much to the
- * console on the rare cases it is ever triggered. */
-
- if (in_interrupt()) {
- cfs_trace_debug_print();
- } else {
- libcfs_debug_dumplog_internal((void *)(long)current->pid);
- }
-#endif
- return 0;
-}
-
-static struct notifier_block libcfs_panic_notifier = {
- .notifier_call = panic_notifier,
- .next = NULL,
- .priority = 10000
-};
-
-void libcfs_register_panic_notifier(void)
-{
- atomic_notifier_chain_register(&panic_notifier_list, &libcfs_panic_notifier);
-}
-
-void libcfs_unregister_panic_notifier(void)
-{
- atomic_notifier_chain_unregister(&panic_notifier_list, &libcfs_panic_notifier);
-}
git://git.whamcloud.com / fs / lustre-release.git / commitdiff