Messages in this thread | | | Date | Mon, 21 Dec 2015 14:01:04 +0000 | From | Will Deacon <> | Subject | Re: [BUG REPORT]: ARM64: perf: System hung in perf test |
| |
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
| |