On Sun, Oct 05, 2014 at 06:13:24AM +0100, Vince Weaver wrote: > On Thu, 25 Sep 2014, Mark Rutland wrote: > > > Log 1, x86_64 lockup > > [ 223.007005] [<ffffffff81168910>] ? > > poll_select_copy_remaining+0x130/0x130 > > [ 223.007005] [<ffffffff811600ea>] ? getname_flags+0x4a/0x1a0 > > [ 223.007005] [<ffffffff8116007d>] ? final_putname+0x1d/0x40 > > [ 223.007005] [<ffffffff811602f4>] ? putname+0x24/0x40 > > [ 223.007005] [<ffffffff8116581a>] ? user_path_at_empty+0x5a/0x90 > > [ 223.007005] [<ffffffff810701c0>] ? wake_up_state+0x10/0x10 > > [ 223.007005] [<ffffffff81198078>] ? eventfd_read+0x38/0x60 > > [ 223.007005] [<ffffffff810a1e75>] ? ktime_get_ts64+0x45/0xf0 > > [ 223.007005] [<ffffffff81169f00>] SyS_poll+0x60/0xf0 > > I have seen issues similar to this before, where the problem appeared > to be in poll/hrtimer. Never managed to track down anything useful about > the bug.
Ok. > > Log 2, x86_64 stack overflow > > > [ 346.641345] divide error: 0000 [#1] SMP > > [ 346.642010] Modules linked in: > > [ 346.642010] CPU: 0 PID: 4076 Comm: perf_fuzzer Not tainted > > 3.17.0-rc6hark-perf-lockup+ #1 > > [ 346.642010] Hardware name: LENOVO 7484A3G/LENOVO, BIOS 5CKT54AUS > > 09/07/2009 > > [ 346.642010] task: ffff8801ac449a70 ti: ffff8801ac574000 task.ti: > > ffff8801ac574000 > > [ 346.642010] RIP: 0010:[<ffffffff81078bce>] [<ffffffff81078bce>] > > find_busiest_group+0x28e/0x8a0 > > [ 346.642010] RSP: 0018:ffff8801ac577760 EFLAGS: 00010006 > > [ 346.642010] RAX: 00000000000003ff RBX: 0000000000000000 RCX: > > 00000000ffff8801 > > [ 346.642010] RDX: 0000000000000000 RSI: 0000000000000001 RDI: > > 0000000000000001 > > [ 346.642010] RBP: ffff8801ac577890 R08: 0000000000000000 R09: > > 0000000000000000 > > [ 346.704010] ------------[ cut here ]------------ > > [ 346.704017] WARNING: CPU: 2 PID: 5 at arch/x86/kernel/irq_64.c:70 > > handle_irq+0x141/0x150() > > [ 346.704019] do_IRQ(): has overflown the kernel stack > > (cur:1,sp:ffff8801b653fe88,irq stk > > top-bottom:ffff8801bed00080-ffff8801bed03fc0,exception stk > > top-bottom:ffff8801bed04080-ffff8801bed0a000) > > weird, have not seen this before. Though I was hitting a reboot issue > that would give really strange crash messages that was possibly fixed by > a patch that went into 3.17-rc7. Interesting. I'll retry with v3.17. > > Log 3, arm64 lockup > > ---->8---- > > > Seeding random number generator with 1411488270 > > /proc/sys/kernel/perf_event_max_sample_rate currently: 285518974/s > > /proc/sys/kernel/perf_event_paranoid currently: 1142898651 > > Those last two lines are suspect. Is my fuzzer broken on arm64 somehow? Good point. I'd mainly paid attention to the stack dump and hadn't noticed. I'll take a look shortly and see what's going on. > Sorry that I don't have good answers for these bugs, but I will stick them > in my perf_fuzzer outstanding bugs list. Cheers anyhow. I'll see if I can figure out anything further. Mark. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
