[Bug 219988] [kernel] sys/kern/kern_sysctl.c:a sleep-under-rmlock bug in sysctl_add_oid

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219988

            Bug ID: 219988
           Summary: [kernel] sys/kern/kern_sysctl.c:a sleep-under-rmlock
                    bug in sysctl_add_oid
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: baijiaju1990 at 163.com

The kernel may sleep under a rmlock, and the function call path in file
"sys/kern/kern_sysctl.c" in FreeBSD 11.0 is:
sysctl_add_oid [line 706: acquire the rmlock]
  malloc(M_WAITOK) [line 722] --> may sleep

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

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

Jia-Ju Bai

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