Revision 85bd839983778fcd0c1c043327b14a046e979b39 authored by Gu Zheng on 10 June 2015, 18:14:43 UTC, committed by Linus Torvalds on 10 June 2015, 23:43:43 UTC
Izumi found the following oops when hot re-adding a node: BUG: unable to handle kernel paging request at ffffc90008963690 IP: __wake_up_bit+0x20/0x70 Oops: 0000 [#1] SMP CPU: 68 PID: 1237 Comm: rs:main Q:Reg Not tainted 4.1.0-rc5 #80 Hardware name: FUJITSU PRIMEQUEST2800E/SB, BIOS PRIMEQUEST 2000 Series BIOS Version 1.87 04/28/2015 task: ffff880838df8000 ti: ffff880017b94000 task.ti: ffff880017b94000 RIP: 0010:[<ffffffff810dff80>] [<ffffffff810dff80>] __wake_up_bit+0x20/0x70 RSP: 0018:ffff880017b97be8 EFLAGS: 00010246 RAX: ffffc90008963690 RBX: 00000000003c0000 RCX: 000000000000a4c9 RDX: 0000000000000000 RSI: ffffea101bffd500 RDI: ffffc90008963648 RBP: ffff880017b97c08 R08: 0000000002000020 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8a0797c73800 R13: ffffea101bffd500 R14: 0000000000000001 R15: 00000000003c0000 FS: 00007fcc7ffff700(0000) GS:ffff880874800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90008963690 CR3: 0000000836761000 CR4: 00000000001407e0 Call Trace: unlock_page+0x6d/0x70 generic_write_end+0x53/0xb0 xfs_vm_write_end+0x29/0x80 [xfs] generic_perform_write+0x10a/0x1e0 xfs_file_buffered_aio_write+0x14d/0x3e0 [xfs] xfs_file_write_iter+0x79/0x120 [xfs] __vfs_write+0xd4/0x110 vfs_write+0xac/0x1c0 SyS_write+0x58/0xd0 system_call_fastpath+0x12/0x76 Code: 5d c3 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 48 83 ec 20 65 48 8b 04 25 28 00 00 00 48 89 45 f8 31 c0 48 8d 47 48 <48> 39 47 48 48 c7 45 e8 00 00 00 00 48 c7 45 f0 00 00 00 00 48 RIP [<ffffffff810dff80>] __wake_up_bit+0x20/0x70 RSP <ffff880017b97be8> CR2: ffffc90008963690 Reproduce method (re-add a node):: Hot-add nodeA --> remove nodeA --> hot-add nodeA (panic) This seems an use-after-free problem, and the root cause is zone->wait_table was not set to *NULL* after free it in try_offline_node. When hot re-add a node, we will reuse the pgdat of it, so does the zone struct, and when add pages to the target zone, it will init the zone first (including the wait_table) if the zone is not initialized. The judgement of zone initialized is based on zone->wait_table: static inline bool zone_is_initialized(struct zone *zone) { return !!zone->wait_table; } so if we do not set the zone->wait_table to *NULL* after free it, the memory hotplug routine will skip the init of new zone when hot re-add the node, and the wait_table still points to the freed memory, then we will access the invalid address when trying to wake up the waiting people after the i/o operation with the page is done, such as mentioned above. Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Reported-by: Taku Izumi <izumi.taku@jp.fujitsu.com> Reviewed by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Tang Chen <tangchen@cn.fujitsu.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 5879ae5
thermal_hwmon.c
/*
* thermal_hwmon.c - Generic Thermal Management hwmon support.
*
* Code based on Intel thermal_core.c. Copyrights of the original code:
* Copyright (C) 2008 Intel Corp
* Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
*
* Copyright (C) 2013 Texas Instruments
* Copyright (C) 2013 Eduardo Valentin <eduardo.valentin@ti.com>
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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; version 2 of the License.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/hwmon.h>
#include <linux/thermal.h>
#include <linux/slab.h>
#include <linux/err.h>
#include "thermal_hwmon.h"
/* hwmon sys I/F */
/* thermal zone devices with the same type share one hwmon device */
struct thermal_hwmon_device {
char type[THERMAL_NAME_LENGTH];
struct device *device;
int count;
struct list_head tz_list;
struct list_head node;
};
struct thermal_hwmon_attr {
struct device_attribute attr;
char name[16];
};
/* one temperature input for each thermal zone */
struct thermal_hwmon_temp {
struct list_head hwmon_node;
struct thermal_zone_device *tz;
struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
};
static LIST_HEAD(thermal_hwmon_list);
static DEFINE_MUTEX(thermal_hwmon_list_lock);
static ssize_t
name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", hwmon->type);
}
static DEVICE_ATTR(name, 0444, name_show, NULL);
static ssize_t
temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
{
long temperature;
int ret;
struct thermal_hwmon_attr *hwmon_attr
= container_of(attr, struct thermal_hwmon_attr, attr);
struct thermal_hwmon_temp *temp
= container_of(hwmon_attr, struct thermal_hwmon_temp,
temp_input);
struct thermal_zone_device *tz = temp->tz;
ret = thermal_zone_get_temp(tz, &temperature);
if (ret)
return ret;
return sprintf(buf, "%ld\n", temperature);
}
static ssize_t
temp_crit_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_hwmon_attr *hwmon_attr
= container_of(attr, struct thermal_hwmon_attr, attr);
struct thermal_hwmon_temp *temp
= container_of(hwmon_attr, struct thermal_hwmon_temp,
temp_crit);
struct thermal_zone_device *tz = temp->tz;
long temperature;
int ret;
ret = tz->ops->get_trip_temp(tz, 0, &temperature);
if (ret)
return ret;
return sprintf(buf, "%ld\n", temperature);
}
static struct thermal_hwmon_device *
thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
{
struct thermal_hwmon_device *hwmon;
mutex_lock(&thermal_hwmon_list_lock);
list_for_each_entry(hwmon, &thermal_hwmon_list, node)
if (!strcmp(hwmon->type, tz->type)) {
mutex_unlock(&thermal_hwmon_list_lock);
return hwmon;
}
mutex_unlock(&thermal_hwmon_list_lock);
return NULL;
}
/* Find the temperature input matching a given thermal zone */
static struct thermal_hwmon_temp *
thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
const struct thermal_zone_device *tz)
{
struct thermal_hwmon_temp *temp;
mutex_lock(&thermal_hwmon_list_lock);
list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
if (temp->tz == tz) {
mutex_unlock(&thermal_hwmon_list_lock);
return temp;
}
mutex_unlock(&thermal_hwmon_list_lock);
return NULL;
}
static bool thermal_zone_crit_temp_valid(struct thermal_zone_device *tz)
{
unsigned long temp;
return tz->ops->get_crit_temp && !tz->ops->get_crit_temp(tz, &temp);
}
int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
{
struct thermal_hwmon_device *hwmon;
struct thermal_hwmon_temp *temp;
int new_hwmon_device = 1;
int result;
hwmon = thermal_hwmon_lookup_by_type(tz);
if (hwmon) {
new_hwmon_device = 0;
goto register_sys_interface;
}
hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL);
if (!hwmon)
return -ENOMEM;
INIT_LIST_HEAD(&hwmon->tz_list);
strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
hwmon->device = hwmon_device_register(NULL);
if (IS_ERR(hwmon->device)) {
result = PTR_ERR(hwmon->device);
goto free_mem;
}
dev_set_drvdata(hwmon->device, hwmon);
result = device_create_file(hwmon->device, &dev_attr_name);
if (result)
goto free_mem;
register_sys_interface:
temp = kzalloc(sizeof(*temp), GFP_KERNEL);
if (!temp) {
result = -ENOMEM;
goto unregister_name;
}
temp->tz = tz;
hwmon->count++;
snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
"temp%d_input", hwmon->count);
temp->temp_input.attr.attr.name = temp->temp_input.name;
temp->temp_input.attr.attr.mode = 0444;
temp->temp_input.attr.show = temp_input_show;
sysfs_attr_init(&temp->temp_input.attr.attr);
result = device_create_file(hwmon->device, &temp->temp_input.attr);
if (result)
goto free_temp_mem;
if (thermal_zone_crit_temp_valid(tz)) {
snprintf(temp->temp_crit.name,
sizeof(temp->temp_crit.name),
"temp%d_crit", hwmon->count);
temp->temp_crit.attr.attr.name = temp->temp_crit.name;
temp->temp_crit.attr.attr.mode = 0444;
temp->temp_crit.attr.show = temp_crit_show;
sysfs_attr_init(&temp->temp_crit.attr.attr);
result = device_create_file(hwmon->device,
&temp->temp_crit.attr);
if (result)
goto unregister_input;
}
mutex_lock(&thermal_hwmon_list_lock);
if (new_hwmon_device)
list_add_tail(&hwmon->node, &thermal_hwmon_list);
list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
mutex_unlock(&thermal_hwmon_list_lock);
return 0;
unregister_input:
device_remove_file(hwmon->device, &temp->temp_input.attr);
free_temp_mem:
kfree(temp);
unregister_name:
if (new_hwmon_device) {
device_remove_file(hwmon->device, &dev_attr_name);
hwmon_device_unregister(hwmon->device);
}
free_mem:
if (new_hwmon_device)
kfree(hwmon);
return result;
}
void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
{
struct thermal_hwmon_device *hwmon;
struct thermal_hwmon_temp *temp;
hwmon = thermal_hwmon_lookup_by_type(tz);
if (unlikely(!hwmon)) {
/* Should never happen... */
dev_dbg(&tz->device, "hwmon device lookup failed!\n");
return;
}
temp = thermal_hwmon_lookup_temp(hwmon, tz);
if (unlikely(!temp)) {
/* Should never happen... */
dev_dbg(&tz->device, "temperature input lookup failed!\n");
return;
}
device_remove_file(hwmon->device, &temp->temp_input.attr);
if (thermal_zone_crit_temp_valid(tz))
device_remove_file(hwmon->device, &temp->temp_crit.attr);
mutex_lock(&thermal_hwmon_list_lock);
list_del(&temp->hwmon_node);
kfree(temp);
if (!list_empty(&hwmon->tz_list)) {
mutex_unlock(&thermal_hwmon_list_lock);
return;
}
list_del(&hwmon->node);
mutex_unlock(&thermal_hwmon_list_lock);
device_remove_file(hwmon->device, &dev_attr_name);
hwmon_device_unregister(hwmon->device);
kfree(hwmon);
}
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...