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>
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wacom_wac.h
/*
* drivers/input/tablet/wacom_wac.h
*
* 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.
*/
#ifndef WACOM_WAC_H
#define WACOM_WAC_H
#include <linux/types.h>
#include <linux/hid.h>
/* maximum packet length for USB devices */
#define WACOM_PKGLEN_MAX 192
#define WACOM_NAME_MAX 64
/* packet length for individual models */
#define WACOM_PKGLEN_PENPRTN 7
#define WACOM_PKGLEN_GRAPHIRE 8
#define WACOM_PKGLEN_BBFUN 9
#define WACOM_PKGLEN_INTUOS 10
#define WACOM_PKGLEN_TPC1FG 5
#define WACOM_PKGLEN_TPC1FG_B 10
#define WACOM_PKGLEN_TPC2FG 14
#define WACOM_PKGLEN_BBTOUCH 20
#define WACOM_PKGLEN_BBTOUCH3 64
#define WACOM_PKGLEN_BBPEN 10
#define WACOM_PKGLEN_WIRELESS 32
#define WACOM_PKGLEN_MTOUCH 62
#define WACOM_PKGLEN_MTTPC 40
#define WACOM_PKGLEN_DTUS 68
#define WACOM_PKGLEN_PENABLED 8
#define WACOM_PKGLEN_BPAD_TOUCH 32
#define WACOM_PKGLEN_BPAD_TOUCH_USB 64
/* wacom data size per MT contact */
#define WACOM_BYTES_PER_MT_PACKET 11
#define WACOM_BYTES_PER_24HDT_PACKET 14
#define WACOM_BYTES_PER_QHDTHID_PACKET 6
/* device IDs */
#define STYLUS_DEVICE_ID 0x02
#define TOUCH_DEVICE_ID 0x03
#define CURSOR_DEVICE_ID 0x06
#define ERASER_DEVICE_ID 0x0A
#define PAD_DEVICE_ID 0x0F
/* wacom data packet report IDs */
#define WACOM_REPORT_PENABLED 2
#define WACOM_REPORT_PENABLED_BT 3
#define WACOM_REPORT_INTUOSREAD 5
#define WACOM_REPORT_INTUOSWRITE 6
#define WACOM_REPORT_INTUOSPAD 12
#define WACOM_REPORT_INTUOS5PAD 3
#define WACOM_REPORT_DTUSPAD 21
#define WACOM_REPORT_TPC1FG 6
#define WACOM_REPORT_TPC2FG 13
#define WACOM_REPORT_TPCMT 13
#define WACOM_REPORT_TPCMT2 3
#define WACOM_REPORT_TPCHID 15
#define WACOM_REPORT_CINTIQ 16
#define WACOM_REPORT_CINTIQPAD 17
#define WACOM_REPORT_TPCST 16
#define WACOM_REPORT_DTUS 17
#define WACOM_REPORT_TPC1FGE 18
#define WACOM_REPORT_24HDT 1
#define WACOM_REPORT_WL 128
#define WACOM_REPORT_USB 192
#define WACOM_REPORT_BPAD_PEN 3
#define WACOM_REPORT_BPAD_TOUCH 16
/* device quirks */
#define WACOM_QUIRK_BBTOUCH_LOWRES 0x0001
#define WACOM_QUIRK_NO_INPUT 0x0002
#define WACOM_QUIRK_MONITOR 0x0004
#define WACOM_QUIRK_BATTERY 0x0008
#define WACOM_PEN_FIELD(f) (((f)->logical == HID_DG_STYLUS) || \
((f)->physical == HID_DG_STYLUS) || \
((f)->physical == HID_DG_PEN) || \
((f)->application == HID_DG_PEN))
#define WACOM_FINGER_FIELD(f) (((f)->logical == HID_DG_FINGER) || \
((f)->physical == HID_DG_FINGER) || \
((f)->application == HID_DG_TOUCHSCREEN))
enum {
PENPARTNER = 0,
GRAPHIRE,
GRAPHIRE_BT,
WACOM_G4,
PTU,
PL,
DTU,
DTUS,
DTUSX,
INTUOS,
INTUOS3S,
INTUOS3,
INTUOS3L,
INTUOS4S,
INTUOS4,
INTUOS4WL,
INTUOS4L,
INTUOS5S,
INTUOS5,
INTUOS5L,
INTUOSPS,
INTUOSPM,
INTUOSPL,
INTUOSHT,
WACOM_21UX2,
WACOM_22HD,
DTK,
WACOM_24HD,
WACOM_27QHD,
CINTIQ_HYBRID,
CINTIQ,
WACOM_BEE,
WACOM_13HD,
WACOM_MO,
WIRELESS,
BAMBOO_PT,
WACOM_24HDT,
WACOM_27QHDT,
BAMBOO_PAD,
TABLETPC, /* add new TPC below */
TABLETPCE,
TABLETPC2FG,
MTSCREEN,
MTTPC,
MTTPC_B,
HID_GENERIC,
MAX_TYPE
};
struct wacom_features {
const char *name;
int x_max;
int y_max;
int pressure_max;
int distance_max;
int type;
int x_resolution;
int y_resolution;
int x_min;
int y_min;
int device_type;
int x_phy;
int y_phy;
unsigned unit;
int unitExpo;
int x_fuzz;
int y_fuzz;
int pressure_fuzz;
int distance_fuzz;
unsigned quirks;
unsigned touch_max;
int oVid;
int oPid;
int pktlen;
bool check_for_hid_type;
int hid_type;
int last_slot_field;
};
struct wacom_shared {
bool stylus_in_proximity;
bool touch_down;
/* for wireless device to access USB interfaces */
unsigned touch_max;
int type;
struct input_dev *touch_input;
struct hid_device *pen;
struct hid_device *touch;
};
struct hid_data {
__s16 inputmode; /* InputMode HID feature, -1 if non-existent */
__s16 inputmode_index; /* InputMode HID feature index in the report */
bool inrange_state;
bool invert_state;
bool tipswitch;
int x;
int y;
int pressure;
int width;
int height;
int id;
};
struct wacom_wac {
char name[WACOM_NAME_MAX];
char pad_name[WACOM_NAME_MAX];
char bat_name[WACOM_NAME_MAX];
char ac_name[WACOM_NAME_MAX];
unsigned char data[WACOM_PKGLEN_MAX];
int tool[2];
int id[2];
__u32 serial[2];
bool reporting_data;
struct wacom_features features;
struct wacom_shared *shared;
struct input_dev *input;
struct input_dev *pad_input;
bool input_registered;
bool pad_registered;
int pid;
int battery_capacity;
int num_contacts_left;
int bat_charging;
int bat_connected;
int ps_connected;
u8 bt_features;
u8 bt_high_speed;
struct hid_data hid_data;
};
#endif
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