[BUG] Kernel panic when using Hibernation on kernel 6.1.25

[BUG] Kernel panic when using Hibernation on kernel 6.1.25

[Jia-hao Bai (白家豪)]

Hi,

I encountered a kernel panic when using the Hibernation on kernel version 6.1.25. Below are the details of the issue:

**Description:**
When I enable CONFIG_HIBERNATION and assign a specific partition for hibernation resuming and perform a specific operation, the system crashes with a kernel panic.

CONFIG_HIBERNATION=y
CONFIG_PM_STD_PARTITION="/dev/mmcblk0p16"

**Steps to Reproduce:**
1.	Set printk to level 8: ` echo 8 > /proc/sys/kernel/printk`
2.	Set up the swap partition: ` mkswap /dev/mmcblk0p16`
3.	Enable the swap partition: ` swapon -p -3 /dev/mmcblk0p16`
4.	Configure hibernation resuming settings: ` echo "/dev/mmcblk0p16" > /sys/power/resume`
5.	Configure hibernation mode:` echo reboot > /sys/power/disk`
6.	Perform the operation: ` echo disk > /sys/power/state`
7.	Observe the kernel panic


**Expected Behavior:**
The operation should complete successfully without causing a kernel panic.

**Actual Behavior:**
The system crashes with a kernel panic.

**Environment:**
- Kernel version: 6.1.25
- Distribution: Yocto 4.0 32bit/Kernel 6.1.25 32bit
- Hardware: Arm Cortex A55, 1GB RAM

**Logs:**
```
[   82.075123] PM: hibernation: Creating image:
[   82.075123] PM: hibernation: Need to copy 59239 pages
[   82.075123] 8<--- cut here ---
[   82.075123] Unable to handle kernel paging request at virtual address c2fc0000
[   82.075123] [c2fc0000] *pgd=42dff801, *pte=00000000, *ppte=00000000
[   82.075123] Internal error: Oops: 7 [#1] PREEMPT SMP ARM
[   82.075123] num_die-1, last_step-0
[   82.075123] 
[   82.075123] Kernel Offset: disabled
[   82.075123] PC is at safe_copy_page+0x20/0x34
[   82.075123] LR is at safe_copy_page+0x18/0x34
[   82.075123] pc : [<c0c97e58>]    lr : [<c0c97e50>]    psr: 800001d3
[   82.075123] sp : c1b63f90  ip : 00000002  fp : ed76b700
[   82.075123] r10: 00181668  r9 : c13ae5f4  r8 : c13ae620
[   82.075123] r7 : 0000e767  r6 : c13dc840  r5 : ed881668  r4 : cab4a000
[   82.075123] r3 : cab49ffc  r2 : c2fc1000  r1 : 38e38e39  r0 : c2fc0000
[   82.075123] CPU: 0 PID: 811 Comm: sh Tainted: G           O       6.1.25-mainline #1
[   82.075123] Hardware name: Generic DT based system
[   82.075123]  unwind_backtrace from show_stack+0x18/0x1c
[   82.075123]  show_stack from dump_stack_lvl+0x40/0x4c
[   82.075123]  dump_stack_lvl from mrdump_common_die+0x334/0x370
[   82.075123]  mrdump_common_die from notify_die+0x8c/0xc4
[   82.075123]  notify_die from die+0x108/0x4c0
[   82.075123]  die from die_kernel_fault+0x6c/0x7c
[   82.075123]  die_kernel_fault from do_page_fault+0x0/0x328```

Please let me know if you need any additional information or if there are any patches I can test.

Thanks,
Jia-hao Bai

Re: [BUG] Kernel panic when using Hibernation on kernel 6.1.25

[Pavel Machek]

[-- Attachment #1: Type: text/plain, Size: 1397 bytes --]

Hi!

> I encountered a kernel panic when using the Hibernation on kernel version 6.1.25. Below are the details of the issue:
> 
> **Description:**
> When I enable CONFIG_HIBERNATION and assign a specific partition for hibernation resuming and perform a specific operation, the system crashes with a kernel panic.
> 
> CONFIG_HIBERNATION=y
> CONFIG_PM_STD_PARTITION="/dev/mmcblk0p16"
> 
> **Steps to Reproduce:**
> 1.	Set printk to level 8: ` echo 8 > /proc/sys/kernel/printk`
> 2.	Set up the swap partition: ` mkswap /dev/mmcblk0p16`
> 3.	Enable the swap partition: ` swapon -p -3 /dev/mmcblk0p16`
> 4.	Configure hibernation resuming settings: ` echo "/dev/mmcblk0p16" > /sys/power/resume`
> 5.	Configure hibernation mode:` echo reboot > /sys/power/disk`
> 6.	Perform the operation: ` echo disk > /sys/power/state`
> 7.	Observe the kernel panic
> 
> 
> **Expected Behavior:**
> The operation should complete successfully without causing a kernel panic.
> 
> **Actual Behavior:**
> The system crashes with a kernel panic.
> 
> **Environment:**
> - Kernel version: 6.1.25
> - Distribution: Yocto 4.0 32bit/Kernel 6.1.25 32bit
> - Hardware: Arm Cortex A55, 1GB RAM

We'd need to know way more about the hardware. Also testing with
latest mainline would be useful.

Best regards,
							Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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RE: [BUG] Kernel panic when using Hibernation on kernel 6.1.25

[Jia-hao Bai (白家豪)]

Hi Pavel,

Hardware: Arm Cortex A55, 1GB RAM, eMMC 8G.

Error log：
[ 1362.985700] sh:  notify_die from die+0x144/0x5f0
[ 1362.985700] sh:  die from die_kernel_fault+0x138/0x148
[ 1362.985700] sh:  die_kernel_fault from __do_kernel_fault.part.0+0x5c/0xac
[ 1362.985700] sh:  __do_kernel_fault.part.0 from do_translation_fault+0xbc/0xe0
[ 1362.985700] sh:  do_translation_fault from do_DataAbort+0x44/0x1d0
[ 1362.985700] sh:  do_DataAbort from __dabt_svc+0x4c/0x80
[ 1362.985700] sh: Exception stack(0xc1e8df38 to 0xc1e8df80)
[ 1362.985700] sh: df20:                                                       c3000000 00000000
[ 1362.985700] sh: df40: c3001000 ea157ffc ea158000 c17639a8 c17bd548 edceb060 c184b540 c17bd5a0
[ 1362.985700] sh: df60: 00007fd7 ed76c000 00000000 c1e8df88 c0ebe4dc c0ebe4e4 800001d3 ffffffff
[ 1362.985700] sh:  __dabt_svc from safe_copy_page+0x20/0x4c
[ 1362.985700] sh:  safe_copy_page from swsusp_save+0x580/0x5ac
[ 1362.985700] sh:  swsusp_save from arch_save_image+0x8/0x74
[ 1362.985700] sh:  arch_save_image from cpu_suspend_abort+0x0/0x18

We compared between K5.4 and K6.1.25 and found that Hibernation does not save the reserve area on K5.4 because it is blocked by pfn_valid.

Therefore, we have added the following workaround to skip some reserved memory sections.

The skip region is obtained from "cat /proc/iomem".
40000000-42fbffff : System RAM
  40008000-410fffff : Kernel code
  41200000-4144a25f : Kernel data
43100000-4402ffff : System RAM
45140000-593fffff : System RAM
59401000-5940ffff : System RAM
5941f000-594effff : System RAM
59501180-595fffff : System RAM
59640000-7fffffff : System RAM

static unsigned int pfn_is_reserved(unsigned long pfn){
	phys_addr_t phys = __pfn_to_phy
	if(phys >= 0x42fc0000 && phys< 0x43100000){
		return true;
	}
	if(phys >= 0x44030000 && phys< 0x45140000){
		return true;
	}
	if(phys >= 0x59400000 && phys< 0x59401000){
		return true;
	}
	if(phys >= 0x59410000 && phys< 0x5941f000){
		return true;
	}
	if(phys >= 0x594f0000 && phys< 0x59501180){
		return true;
	}
        if(phys >= 0x59600000 && phys< 0x59640000){
                return true;
        }
	return false;

}

static struct page *saveable_page(struct zone *zone, unsigned long pfn)
{
	struct page *page;

	if (!pfn_valid(pfn)){
		return NULL;
	}
	
	if(pfn_is_reserved(pfn))
		 return NULL;
........


Do you know of any patches that can fix this problem?

thanks

-----Original Message-----
From: Pavel Machek <pavel@ucw.cz> 
Sent: Thursday, June 13, 2024 6:52 PM
To: Jia-hao Bai (白家豪) <Jia-hao.Bai@mediatek.com>
Cc: linux-kernel@vger.kernel.org; rafael@kernel.org; Iverlin Wang (王苳霖) <Iverlin.Wang@mediatek.com>; Boy Wu (吳勃誼) <Boy.Wu@mediatek.com>; Seiya Wang (王迺君) <seiya.wang@mediatek.com>; Dengjun Su (苏邓军) <Dengjun.Su@mediatek.com>; Win Yeh (葉昌倫) <Win.Yeh@mediatek.com>; Sowell Peng (彭首偉) <Sowell.Peng@mediatek.com>; Richard-CC Yang (楊職銓) <Richard-CC.Yang@mediatek.com>
Subject: Re: [BUG] Kernel panic when using Hibernation on kernel 6.1.25

Hi!

> I encountered a kernel panic when using the Hibernation on kernel version 6.1.25. Below are the details of the issue:
> 
> **Description:**
> When I enable CONFIG_HIBERNATION and assign a specific partition for hibernation resuming and perform a specific operation, the system crashes with a kernel panic.
> 
> CONFIG_HIBERNATION=y
> CONFIG_PM_STD_PARTITION="/dev/mmcblk0p16"
> 
> **Steps to Reproduce:**
> 1.	Set printk to level 8: ` echo 8 > /proc/sys/kernel/printk`
> 2.	Set up the swap partition: ` mkswap /dev/mmcblk0p16`
> 3.	Enable the swap partition: ` swapon -p -3 /dev/mmcblk0p16`
> 4.	Configure hibernation resuming settings: ` echo "/dev/mmcblk0p16" > /sys/power/resume`
> 5.	Configure hibernation mode:` echo reboot > /sys/power/disk`
> 6.	Perform the operation: ` echo disk > /sys/power/state`
> 7.	Observe the kernel panic
> 
> 
> **Expected Behavior:**
> The operation should complete successfully without causing a kernel panic.
> 
> **Actual Behavior:**
> The system crashes with a kernel panic.
> 
> **Environment:**
> - Kernel version: 6.1.25
> - Distribution: Yocto 4.0 32bit/Kernel 6.1.25 32bit
> - Hardware: Arm Cortex A55, 1GB RAM

We'd need to know way more about the hardware. Also testing with latest mainline would be useful.

Best regards,
							Pavel
--
People of Russia, stop Putin before his war on Ukraine escalates.

RE: [BUG] Kernel panic when using Hibernation on kernel 6.1.25

[Jia-hao Bai (白家豪)]

Hi Pavel,

We have CONFIG_KFENCE enabled, and KFENCE detects use-after-free, invalid reads, and out-of-bounds reads in safe_copy_page(kernel/power/snapshot.c).

Do you know why hibernation encounters these problems when entering suspend?

My environment：
1.Kernel 6.1.25 arm 32bit.
2.DRAM 1GB
3. Memory related configuration:
CONFIG_CROSS_MEMORY_ATTACH=y
CONFIG_MEMCG=y
CONFIG_MEMCG_KMEM=y
CONFIG_SHMEM=y
CONFIG_MEMBARRIER=y
CONFIG_ARCH_HAS_MEMBARRIER_SYNC_CORE=y
CONFIG_FIX_EARLYCON_MEM=y
CONFIG_ARM_DMA_MEM_BUFFERABLE=y
CONFIG_ARCH_SELECT_MEMORY_MODEL=y
CONFIG_ARCH_FLATMEM_ENABLE=y
CONFIG_ARCH_SPARSEMEM_ENABLE=y
CONFIG_HIGHMEM=y
CONFIG_ARCH_HAS_SET_MEMORY=y
CONFIG_SELECT_MEMORY_MODEL=y
CONFIG_FLATMEM_MANUAL=y
CONFIG_FLATMEM=y
CONFIG_ARCH_KEEP_MEMBLOCK=y
CONFIG_MEMORY_ISOLATION=y
CONFIG_OF_RESERVED_MEM=y
CONFIG_INPUT_FF_MEMLESS=y
CONFIG_V4L2_MEM2MEM_DEV=y
CONFIG_V4L_MEM2MEM_DRIVERS=y
CONFIG_VIDEOBUF2_MEMOPS=y
CONFIG_DRM_GEM_SHMEM_HELPER=m
CONFIG_ASHMEM=y
CONFIG_MEMORY=y
CONFIG_NVMEM=y
CONFIG_NVMEM_SYSFS=y
CONFIG_MEMFD_CREATE=y
CONFIG_HAS_IOMEM=y
CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED=y
CONFIG_HAVE_DEBUG_KMEMLEAK=y
CONFIG_DEBUG_HIGHMEM=y
CONFIG_ARCH_USE_MEMTEST=y


[   33.001597] BUG: KFENCE: use-after-free read in safe_copy_page+0x74/0x88
[   33.001597] 
[   33.001597] Use-after-free read at 0xefcd9000 pfn:6fcd9 (in kfence-#5):
[   33.001597]  safe_copy_page+0x74/0x88
[   33.001597]  swsusp_save+0x400/0x460
[   33.001597]  arch_save_image+0x8/0x4c
[   33.001597]  cpu_suspend_abort+0x0/0x18
[   33.001597] 
[   33.001597] kfence-#5: 0xefcd9000-0xefc_fork+0x14/0x2c
[   33.001597] 
[   33.001597] freed by task 1 on cpu 0 at 0.527036s:
[   33.001597]  tp_initcall_finish_cb+0x17c/0x1a8
[   33.001597]  do_one_initcall+0x13c/0x250
[   33.001597]  kernel_init_freeable+0x23c/0x2a0
[   33.001597]  kernel_init+0x20/0x138
[   33.001597]  ret_from_fork+0x14/0x2c
[   33.001597] 
[   33.001597] CPU: 0 PID: 776 Comm: sh Tainted: G    B   W          6.1.25-mainline #1
[   33.001597] Hardware name: Generic DT based system
[   33.001597] PC is at safe_copy_page+0x74/0x88
[   33.001597] LR is at safe_copy_page+0x70/0x88
[   33.001597] pc : [<c0c9cb3c>]    lr : [<c0c9cb38>]    psr: 800700d3
[   33.001597] sp : c1aecf90  ip : c0007081  fp : c139f880
[   33.001597] r10: ed9394b4  r9 : 002394b4  r8 : c13ae600
[   33.001597] r7 : eddb8e84  r6 : 0000b6d9  r5 : eddb8e84  r4 : cfd04ffc
[   33.001597] r3 : efcda000  r2 : 001ae3a1  r1 : 38e38e39  r0 : efcd9000
[   33.001597] Flags: Nzcv  IRQs off  FIQs off  Mode SVC_32  ISA ARM  Segment none
[   33.001597] ==================================================================
[   33.001597] BUG: KFENCE: invalid read in safe_copy_page+0x74/0x88
[   33.001597] 
[   33.001597] Invalid read at 0xefce4000 pfn:6fce4:
[   33.001597]  safe_copy_page+0x74/0x88
[   33.001597]  swsusp_save+0x400/0x460
[   33.001597]  arch_save_image+0x8/0x4c
[   33.001597]  cpu_suspend_abort+0x0/0x18
[   33.001597] 
[   33.001597] CPU: 0 PID: 776 Comm: sh Tainted: G    B   W          6.1.25-mainline #1
[   33.001597] Hardware name: Generic DT based system
[   33.001597] PC is at safe_copy_page+0x74/0x88
[   33.001597] LR is at safe_copy_page+0x70/0x88
[   33.00159 FIQs off  Mode SVC_32  ISA ARM  Segment none
[   33.001597] Control: 10c5383d  Table: 46c1c06a  DAC: 00000051
[   33.001597]  safe_copy_page from swsusp_save+0x400/0x460
[   33.001597]  swsusp_save from arch_save_image+0x8/0x4c
[   33.001597]  arch_save_image from cpu_suspend_abort+0x0/0x18
[   33.001597] ==================================================================
[   33.001597] ==================================================================
[   33.001597] BUG: KFENCE: out-of-bounds read in safe_copy_page+0x74/0x88
[   33.001597] 
[   33.001597] Out-of-bounds read at 0xefcd8000 pfn:6fcd8 (4096B right of kfence-#4):
[   33.001597]  safe_copy_page+0x74/0x88
[   33.001597]  swsusp_reate_link+0x48/0xb0
[   33.001597]  sysfs_do_create_link_sd+0x6c/0xe8
[   33.001597]  devlink_add_symlinks+0x124/0x25c
[   33.001597]  device_add+0x444/0x784
[   33.001597]  device_link_add+0x1cc/0x5b4
[   33.001597]  fw_devlink_create_devlink+0x94/0x240
[   33.001597]  __fw_devlink_link_to_suppliers+0x58/0xe0
[   33.001597]  device_add+0x6a8/0x784
[   33.001597]  of_platform_device_create_pdata+0x9c/0xcc
[   33.001597]  of_platform_bus_create+0x1a8/0x230
[   33.001597]  of_platform_bus_create+0x1f4/0x230
[   33.001597]  of_platform_populate+0x68/0xc0
[   33.001597]  of_platform_default_populate_init+0xd4/0xec
[   33.001597]  do_one_initcall+0x48/0x250
[   33.001597]  kernel_init_freeable+0x23c/0x2a0
[   33.001597]  kernel_init+0x20/0x138
[   33.001597]  ret_from_fork+0x14/0x2c
[   33.001597] 
[   33.001597] CPU: 0 PID: 776 Comm: sh Tainted: G    B   W          6.1.25-mainline #1
[   33.001597] Hardware name: Generic DT based system
[   33.001597] PC is at safe_copy_page+0x74/0xr2 : 001ae398  r1 : 38e38e39  r0 : efcd8000
[   33.001597] Flags: Nzcv  IRQs off  FIQs off  Mode SVC_32  ISA ARM  Segment none
[   33.001597] Control: 10c5383d  Table: 46c1c06a  DAC: 00000051
[   33.001597]  safe_copy_page from swsusp_save+0x400/0x460
[   33.001597]  swsusp_save from arch_save_image+0x8/0x4c
[   33.001597]  arch_save_image from cpu_suspend_abort+0x0/0x18


thanks

-----Original Message-----
From: Jia-hao Bai (白家豪) 
Sent: Friday, June 14, 2024 10:32 AM
To: Pavel Machek <pavel@ucw.cz>
Cc: linux-kernel@vger.kernel.org; rafael@kernel.org; Iverlin Wang (王苳霖) <Iverlin.Wang@mediatek.com>; Boy Wu (吳勃誼) <Boy.Wu@mediatek.com>; Seiya Wang (王迺君) <seiya.wang@mediatek.com>; Dengjun Su (苏邓军) <Dengjun.Su@mediatek.com>; Win Yeh (葉昌倫) <Win.Yeh@mediatek.com>; Sowell Peng (彭首偉) <Sowell.Peng@mediatek.com>; Richard-CC Yang (楊職銓) <Richard-CC.Yang@mediatek.com>
Subject: RE: [BUG] Kernel panic when using Hibernation on kernel 6.1.25

Hi Pavel,

Hardware: Arm Cortex A55, 1GB RAM, eMMC 8G.

Error log：
[ 1362.985700] sh:  notify_die from die+0x144/0x5f0 [ 1362.985700] sh:  die from die_kernel_fault+0x138/0x148 [ 1362.985700] sh:  die_kernel_fault from __do_kernel_fault.part.0+0x5c/0xac
[ 1362.985700] sh:  __do_kernel_fault.part.0 from do_translation_fault+0xbc/0xe0 [ 1362.985700] sh:  do_translation_fault from do_DataAbort+0x44/0x1d0 [ 1362.985700] sh:  do_DataAbort from __dabt_svc+0x4c/0x80 [ 1362.985700] sh: Exception stack(0xc1e8df38 to 0xc1e8df80)
[ 1362.985700] sh: df20:                                                       c3000000 00000000
[ 1362.985700] sh: df40: c3001000 ea157ffc ea158000 c17639a8 c17bd548 edceb060 c184b540 c17bd5a0 [ 1362.985700] sh: df60: 00007fd7 ed76c000 00000000 c1e8df88 c0ebe4dc c0ebe4e4 800001d3 ffffffff [ 1362.985700] sh:  __dabt_svc from safe_copy_page+0x20/0x4c [ 1362.985700] sh:  safe_copy_page from swsusp_save+0x580/0x5ac [ 1362.985700] sh:  swsusp_save from arch_save_image+0x8/0x74 [ 1362.985700] sh:  arch_save_image from cpu_suspend_abort+0x0/0x18

We compared between K5.4 and K6.1.25 and found that Hibernation does not save the reserve area on K5.4 because it is blocked by pfn_valid.

Therefore, we have added the following workaround to skip some reserved memory sections.

The skip region is obtained from "cat /proc/iomem".
40000000-42fbffff : System RAM
  40008000-410fffff : Kernel code
  41200000-4144a25f : Kernel data
43100000-4402ffff : System RAM
45140000-593fffff : System RAM
59401000-5940ffff : System RAM
5941f000-594effff : System RAM
59501180-595fffff : System RAM
59640000-7fffffff : System RAM

static unsigned int pfn_is_reserved(unsigned long pfn){
	phys_addr_t phys = __pfn_to_phy
	if(phys >= 0x42fc0000 && phys< 0x43100000){
		return true;
	}
	if(phys >= 0x44030000 && phys< 0x45140000){
		return true;
	}
	if(phys >= 0x59400000 && phys< 0x59401000){
		return true;
	}
	if(phys >= 0x59410000 && phys< 0x5941f000){
		return true;
	}
	if(phys >= 0x594f0000 && phys< 0x59501180){
		return true;
	}
        if(phys >= 0x59600000 && phys< 0x59640000){
                return true;
        }
	return false;

}

static struct page *saveable_page(struct zone *zone, unsigned long pfn) {
	struct page *page;

	if (!pfn_valid(pfn)){
		return NULL;
	}
	
	if(pfn_is_reserved(pfn))
		 return NULL;
........


Do you know of any patches that can fix this problem?

thanks

-----Original Message-----
From: Pavel Machek <pavel@ucw.cz>
Sent: Thursday, June 13, 2024 6:52 PM
To: Jia-hao Bai (白家豪) <Jia-hao.Bai@mediatek.com>
Cc: linux-kernel@vger.kernel.org; rafael@kernel.org; Iverlin Wang (王苳霖) <Iverlin.Wang@mediatek.com>; Boy Wu (吳勃誼) <Boy.Wu@mediatek.com>; Seiya Wang (王迺君) <seiya.wang@mediatek.com>; Dengjun Su (苏邓军) <Dengjun.Su@mediatek.com>; Win Yeh (葉昌倫) <Win.Yeh@mediatek.com>; Sowell Peng (彭首偉) <Sowell.Peng@mediatek.com>; Richard-CC Yang (楊職銓) <Richard-CC.Yang@mediatek.com>
Subject: Re: [BUG] Kernel panic when using Hibernation on kernel 6.1.25

Hi!

> I encountered a kernel panic when using the Hibernation on kernel version 6.1.25. Below are the details of the issue:
> 
> **Description:**
> When I enable CONFIG_HIBERNATION and assign a specific partition for hibernation resuming and perform a specific operation, the system crashes with a kernel panic.
> 
> CONFIG_HIBERNATION=y
> CONFIG_PM_STD_PARTITION="/dev/mmcblk0p16"
> 
> **Steps to Reproduce:**
> 1.	Set printk to level 8: ` echo 8 > /proc/sys/kernel/printk`
> 2.	Set up the swap partition: ` mkswap /dev/mmcblk0p16`
> 3.	Enable the swap partition: ` swapon -p -3 /dev/mmcblk0p16`
> 4.	Configure hibernation resuming settings: ` echo "/dev/mmcblk0p16" > /sys/power/resume`
> 5.	Configure hibernation mode:` echo reboot > /sys/power/disk`
> 6.	Perform the operation: ` echo disk > /sys/power/state`
> 7.	Observe the kernel panic
> 
> 
> **Expected Behavior:**
> The operation should complete successfully without causing a kernel panic.
> 
> **Actual Behavior:**
> The system crashes with a kernel panic.
> 
> **Environment:**
> - Kernel version: 6.1.25
> - Distribution: Yocto 4.0 32bit/Kernel 6.1.25 32bit
> - Hardware: Arm Cortex A55, 1GB RAM

We'd need to know way more about the hardware. Also testing with latest mainline would be useful.

Best regards,
							Pavel
--
People of Russia, stop Putin before his war on Ukraine escalates.

Re: [BUG] Kernel panic when using Hibernation on kernel 6.1.25

[Pavel Machek]

[-- Attachment #1: Type: text/plain, Size: 510 bytes --]

Hi!

> 
> We have CONFIG_KFENCE enabled, and KFENCE detects use-after-free, invalid reads, and out-of-bounds reads in safe_copy_page(kernel/power/snapshot.c).
> 
> Do you know why hibernation encounters these problems when entering
> suspend?

Hibernation will be hard to make cooperating with KFENCE. Just disable
one of them :-).

Alternatively, go to latest mainline and start fixing stuff.

Best regards,
								Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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