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Richard Weinberger saw an unwinder warning when running bcc's opensnoop: WARNING: kernel stack frame pointer at ffff99ef4076bea0 in opensnoop:2008 has bad value 0000000000000008 unwind stack type:0 next_sp: (null) mask:0x2 graph_idx:0 ... ffff99ef4076be88: ffff99ef4076bea0 (0xffff99ef4076bea0) ffff99ef4076be90: ffffffffac442721 (optimized_callback +0x81/0x90) ... A lockdep stack trace was initiated from inside a kprobe handler, when the unwinder noticed a bad frame pointer on the stack. The bad frame pointer is related to the fact that the kprobe optprobe trampoline doesn't save the frame pointer before calling into optimized_callback(). Reported-and-tested-by: Richard Weinberger <richard@sigma-star.at> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: David S . Miller <davem@davemloft.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/7aef2f8ecd75c2f505ef9b80490412262cf4a44c.1507038547.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.