[Bug 220096] [acpi] sys/dev/acpica/acpi_thermal.c: a sleep-under-mutex bug in acpi_tz_thread

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220096

            Bug ID: 220096
           Summary: [acpi] sys/dev/acpica/acpi_thermal.c: a
                    sleep-under-mutex bug in acpi_tz_thread
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: baijiaju1990 at 163.com

The driver may sleep under a mutex, and the code path in file
"sys/dev/acpica/acpi_thermal.c" in FreeBSD 11.0 release is:
acpi_tz_thread [line 992: acquire the mutex]
acpi_tz_thread [line 993]
acpi_tz_thread [line 1003]
acpi_tz_thread [line 1004] (msleep is excuted)
acpi_tz_thread [line 1008]
acpi_tz_thread [line 970]
acpi_tz_thread [line 971]
acpi_tz_thread [line 975]
  malloc(M_WAITOK) [line 976]

The possible fix of this bug is to replace "M_WAITOK" in malloc with
"M_NOWAIT".

This bug is found by a static analysis tool written by myself, and it is
checked by my review of the FreeBSD code.

Thanks,
Jia-Ju Bai

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