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    Subject[PATCH 4.15 40/64] arm64: Disable unhandled signal log messages by default
    Date
    4.15-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Michael Weiser <michael.weiser@gmx.de>

    commit 5ee39a71fd89ab7240c5339d04161c44a8e03269 upstream.

    aarch64 unhandled signal kernel messages are very verbose, suggesting
    them to be more of a debugging aid:

    sigsegv[33]: unhandled level 2 translation fault (11) at 0x00000000, esr
    0x92000046, in sigsegv[400000+71000]
    CPU: 1 PID: 33 Comm: sigsegv Tainted: G W 4.15.0-rc3+ #3
    Hardware name: linux,dummy-virt (DT)
    pstate: 60000000 (nZCv daif -PAN -UAO)
    pc : 0x4003f4
    lr : 0x4006bc
    sp : 0000fffffe94a060
    x29: 0000fffffe94a070 x28: 0000000000000000
    x27: 0000000000000000 x26: 0000000000000000
    x25: 0000000000000000 x24: 00000000004001b0
    x23: 0000000000486ac8 x22: 00000000004001c8
    x21: 0000000000000000 x20: 0000000000400be8
    x19: 0000000000400b30 x18: 0000000000484728
    x17: 000000000865ffc8 x16: 000000000000270f
    x15: 00000000000000b0 x14: 0000000000000002
    x13: 0000000000000001 x12: 0000000000000000
    x11: 0000000000000000 x10: 0008000020008008
    x9 : 000000000000000f x8 : ffffffffffffffff
    x7 : 0004000000000000 x6 : ffffffffffffffff
    x5 : 0000000000000000 x4 : 0000000000000000
    x3 : 00000000004003e4 x2 : 0000fffffe94a1e8
    x1 : 000000000000000a x0 : 0000000000000000

    Disable them by default, so they can be enabled using
    /proc/sys/debug/exception-trace.

    Cc: <stable@vger.kernel.org>
    Signed-off-by: Michael Weiser <michael.weiser@gmx.de>
    Signed-off-by: Will Deacon <will.deacon@arm.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/arm64/kernel/traps.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/arm64/kernel/traps.c
    +++ b/arch/arm64/kernel/traps.c
    @@ -57,7 +57,7 @@ static const char *handler[]= {
    "Error"
    };

    -int show_unhandled_signals = 1;
    +int show_unhandled_signals = 0;

    static void dump_backtrace_entry(unsigned long where)
    {

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