I have an Alienware Aurora R7, running Arch Linux. On shutdown, the kernel panics, with something like this in the panic message (omitting timestamps):
BUG: Unable to handle kernel NULL pointer dereference at (null) IP: i2c_dw_isr+0x3ef/0x6d0 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI
From various sources (1, 2), this seems to be related to the
i2c-designware-core module, and the workaround is blacklisting it. However, with recent kernels (seems to be 4.10 and above), this doesn't seem to be built as a module:
# uname -srv Linux 4.15.2-2-ARCH #1 SMP PREEMPT Thu Feb 8 18:54:52 UTC 2018 # zgrep DESIGNWARE /proc/config.gz CONFIG_I2C_DESIGNWARE_CORE=y CONFIG_I2C_DESIGNWARE_PLATFORM=y CONFIG_I2C_DESIGNWARE_SLAVE=y CONFIG_I2C_DESIGNWARE_PCI=m CONFIG_I2C_DESIGNWARE_BAYTRAIL=y CONFIG_SPI_DESIGNWARE=m CONFIG_SND_DESIGNWARE_I2S=m CONFIG_SND_DESIGNWARE_PCM=y
So I have resorted to making the kernel reboot on panic:
# cat /proc/cmdline root=UUID=e5018f7e-5838-4a47-b146-fc1614673356 rw initrd=/intel-ucode.img initrd=/initramfs-linux.img panic=10 sysrq_always_enabled=1 printk.devkmsg=on
(The odd paths in the
/proc/cmdline are because I boot directly from UEFI, with entries created using
efibootmgr. The paths are rooted at
/boot, where my ESP is mounted.)
This seems to be something for touchpads, but I don't have a touchpad and won't get one. What can I do to disable this thing? Do I have to build a custom kernel?
linux-lts is also newer than 4.10, (4.14, currently), there doesn't seem to be an easy way to install an older kernel either, where blacklisting might presumably work.
nolapic as a kernel parameter solves the shutdown panic problem, but it causes the system to freeze a few minutes after boot, so I can't use it.