https://bugzilla.kernel.org/show_bug.cgi?id=78421
Bug ID: 78421
Summary: Kernel oops in acpi_ex_insert_into_field+0xc7 on hp
EliteBook 6390p
Product: ACPI
Version: 2.5
Kernel Version: 3.12.20
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: blocking
Priority: P1
Component: Config-Tables
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Hi folks,
booting an HP EliteBook 6930p with a 3.12.20 kernel seems to result in a kernel
oops once in a time. Unfortunately, the kernel oops does not show up in
/var/log/messages, I can thus only report the problem from writing down the
oops manually.
Apparently, the problem is a double divide-by-zero error generated from within
acpi_ex_insert_into_field + 0xc7,called from acpi_ex_write_data_to_field.
>From the kernel sources, I suspect that this division by zero is due to the
ACPI_ROUND_UP_TO() macro, line 919ff in exfldio.c. It seems that
access_bit_width is zero when this happens.
Unfortunately, there is no kernel log at this time. I'm attaching a log from a
successful boot (nothing changed, it sometimes works and sometimes crashes!).
Greetings,
Thomas
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