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/*
Copyright (C) 2010 ABRT team
Copyright (C) 2010 RedHat Inc
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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 for more details.
Authors:
Anton Arapov <anton@redhat.com>
Arjan van de Ven <arjan@linux.intel.com>
*/
#include "abrtlib.h"
#include "Kerneloops.h"
#include "DebugDump.h"
#include "ABRTException.h"
#include "CommLayerInner.h"
static unsigned hash_oops_str(const char *oops_ptr)
{
unsigned char old_c;
unsigned char c = 0;
unsigned hash = 0;
/* Special-case: if the first line is of form:
* WARNING: at net/wireless/core.c:614 wdev_cleanup_work+0xe9/0x120 [cfg80211]() (Not tainted)
* then hash only "file:line func+ofs/len" part.
*/
if (strncmp(oops_ptr, "WARNING: at ", sizeof("WARNING: at ")-1) == 0) {
const char *p = oops_ptr + sizeof("WARNING: at ")-1;
p = strchr(p, ' '); /* skip filename:NNN */
if (p) {
p = strchrnul(p + 1, ' '); /* skip function_name+0xNN/0xNNN */
oops_ptr += sizeof("WARNING: at ")-1;
while (oops_ptr < p) {
c = *oops_ptr++;
hash = ((hash << 5) ^ (hash >> 27)) ^ c;
}
return hash;
}
}
while (1) {
old_c = c;
c = *oops_ptr++;
if (!c)
break;
if (c == '\n') {
// Exclude some lines which have process name - in some oops classes
// process name is irrelevant and changes with every oops.
// Lines we filter out:
// Pid: 8003, comm: Xorg Not tainted (2.6.27.9-159.fc10.i686 #1)
// Process Xorg (pid: 8003, ti=f0a0c000 task=f2380000 task.ti=f0a0c000)
if (strncmp(oops_ptr, "Pid: ", 5) == 0
|| strncmp(oops_ptr, "Process ", 8) == 0
) {
while (*oops_ptr && *oops_ptr != '\n')
oops_ptr++;
continue;
}
}
if (!isalnum(old_c)) {
if (c >= '0' && c <= '9') {
// Convert all (possibly hex) numbers to just one '0'
if (c == '0' && *oops_ptr == 'x') // "0xSOMETHING"
oops_ptr++;
while (isxdigit(*oops_ptr))
oops_ptr++;
c = '0';
} else
if ((c|0x20) >= 'a' && (c|0x20) <= 'f') {
// This *may be* a hex number without 0x prefix: "f0a0c000"
// Check that it indeed is, and replace with '0'
const char *oops_ptr2 = oops_ptr;
while (isxdigit(*oops_ptr2))
oops_ptr2++;
// Does it end in a letter which is not a hex digit?
// (Example: "abcw" is not a hex number, "abc " is)
if (!isalpha(*oops_ptr2)) {
// It's "abc " case. Skip the "abc" string
oops_ptr = oops_ptr2;
c = '0';
}
// else: hash the string as-is
}
}
// TODO: Drop call trace tail - in interrupt-driven oopses,
// everything before interrupt is irrelevant.
// Example of call trace part of oops:
// Call Trace:
// [<f88e11c7>] ? radeon_cp_resume+0x7d/0xbc [radeon]
// [<f88745f8>] ? drm_ioctl+0x1b0/0x225 [drm]
// [<f88e114a>] ? radeon_cp_resume+0x0/0xbc [radeon]
// [<c049b1c0>] ? vfs_ioctl+0x50/0x69
// [<c049b414>] ? do_vfs_ioctl+0x23b/0x247
// [<c0460a56>] ? audit_syscall_entry+0xf9/0x123
// [<c049b460>] ? sys_ioctl+0x40/0x5c
// [<c0403c76>] ? syscall_call+0x7/0xb
/* An algorithm proposed by Donald E. Knuth in The Art Of Computer
* Programming Volume 3, under the topic of sorting and search
* chapter 6.4.
*/
hash = ((hash << 5) ^ (hash >> 27)) ^ c;
}
return hash;
}
std::string CAnalyzerKerneloops::GetLocalUUID(const char *pDebugDumpDir)
{
VERB3 log("Getting local universal unique identification");
std::string oops;
{
CDebugDump dd;
dd.Open(pDebugDumpDir);
dd.LoadText(FILENAME_BACKTRACE, oops);
}
unsigned hash = hash_oops_str(oops.c_str());
hash &= 0x7FFFFFFF;
return to_string(hash);
}
std::string CAnalyzerKerneloops::GetGlobalUUID(const char *pDebugDumpDir)
{
return GetLocalUUID(pDebugDumpDir);
}
PLUGIN_INFO(ANALYZER,
CAnalyzerKerneloops,
"Kerneloops",
"0.0.2",
"Analyzes kernel oopses",
"anton@redhat.com",
"https://people.redhat.com/aarapov",
"");
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