On Mon, Dec 21, 2015 at 08:56:03PM +0800, Wangnan (F) wrote: > System hung can be reproduced on qemu and real hardware using: > > # perf test -v signal > > If qemu is started with '-smp 1', system hung. In real hardware and in > qemu with smp > 1, the result is:
That sounds like a qemu issue... > # /perf test -v signal > 17: Test breakpoint overflow signal handler : > --- start --- > test child forked, pid 792 > count1 11, count2 11, overflow 11 > failed: RF EFLAG recursion issue detected > failed: wrong overflow hit > failed: wrong count for bp2 > test child finished with -1 > ---- end ---- > Test breakpoint overflow signal handler: FAILED! ... and this sounds like the perf tool expecting to single-step over signal handlers, whereas (on arm64) we deliberately single-step into them, so you can run into a loop for this case. Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
