[BUG] Kernel panic when using Hibernation on kernel 6.1.25

From: Jia-hao Bai (白家豪)
Date: Tue May 28 2024 - 04:00:24 EST


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