Comment 15 for bug 1938013

Same thing since I upgraded to 4.15.0-151-generic on my laptop. Previously had 150+ days of uptime, now it crashes every few days, and up to 3 times a day.

Very similar behaviour than what Martin reported just above: when logging in to XFCE, it can crash easily, or when simply using the Desktop. When it happens, this is a hard freeze, the watchdog doesn't trigger (I waited for 1 hour), and even the sysrq keys no longer work (yes, these are enabled).

Hardware: DELL Latitude 5300.

To add some datapoints, here are my 2 last crash reports:

==> /var/crash/linux-image-4.15.0-151-generic.31533.crash <==
ProblemType: KernelOops
Annotation: Your system might become unstable now and might need to be restarted.
Date: Fri Jul 23 15:41:43 2021
Failure: oops
OopsText:
 BUG: Bad page map in process Renderer pte:8000009fb753c258 pmd:3993e9067
 addr:00000000b8067c8b vm_flags:080000f9 anon_vma: (null) mapping:0000000073ae2b58 index:648
 file:memfd:mozilla-ipc fault:shmem_fault mmap:shmem_mmap readpage: (null)
 CPU: 0 PID: 5797 Comm: Renderer Not tainted 4.15.0-151-generic #157-Ubuntu
 Hardware name: Dell Inc. Latitude 5300/0932VT, BIOS 1.8.1 12/16/2019
 Call Trace:

Package: linux-image-4.15.0-151-generic 4.15.0-151.157
SourcePackage: linux
Tags: kernel-oops
Uname: Linux 4.15.0-151-generic x86_64

==> /var/crash/linux-image-4.15.0-151-generic.45463.crash <==
ProblemType: KernelOops
Annotation: Your system might become unstable now and might need to be restarted.
Date: Fri Jul 23 15:41:42 2021
Failure: oops
OopsText:
 BUG: Bad page cache in process Renderer pfn:2d5fe5
 page:ffffed164b57f940 count:3 mapcount:1 mapping:ffff8fdc5041b488 index:0x648
 flags: 0x17ffffc004002d(locked|referenced|uptodate|lru|swapbacked)
 raw: 0017ffffc004002d ffff8fdc5041b488 0000000000000648 0000000300000000
 raw: ffffed164d96dbe0 ffffed1650092820 0000000000000000 ffff8fdda9018000
 page dumped because: still mapped when deleted
 page->mem_cgroup:ffff8fdda9018000
 CPU: 0 PID: 5797 Comm: Renderer Tainted: G B 4.15.0-151-generic #157-Ubuntu
 Hardware name: Dell Inc. Latitude 5300/0932VT, BIOS 1.8.1 12/16/2019
 Call Trace:

Package: linux-image-4.15.0-151-generic 4.15.0-151.157
SourcePackage: linux
Tags: kernel-oops
Uname: Linux 4.15.0-151-generic x86_64