Messages in this thread | | | From | Vince Weaver <> | Date | Thu, 2 Jul 2015 23:31:15 -0400 (EDT) | Subject | Re: perf: fuzzer triggered CPU lockup |
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On Thu, 2 Jul 2015, Vince Weaver wrote:
> The fuzzer just turned this up. This is the first part; a huge amount of > CPU lockup messages, rcu stalls, and spinlock lockup suspected messages > followed beyond what I've posted here but eventually the machine recovered (?)
> [20602.134103] [<ffffffff8102f676>] ? intel_pmu_drain_pebs_nhm+0x176/0x2e0
after a reboot I am still getting these, in addition to the other intel_pmu_drain_pebs_nhm related warning. Do I need to try to bisect this down?
[18356.573650] ------------[ cut here ]------------ [18356.578896] WARNING: CPU: 1 PID: 27699 at kernel/watchdog.c:311 watchdog_overflow_callback+0x84/0xa0() [18356.590213] Watchdog detected hard LOCKUP on cpu 1 [18356.706920] CPU: 1 PID: 27699 Comm: perf_fuzzer Tainted: G W 4.1.0+ #162 [18356.716672] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014 [18356.725951] ffffffff81a27b92 ffff88011ea45af0 ffffffff8169e763 0000000000000000 [18356.738175] ffff88011ea45b40 ffff88011ea45b30 ffffffff8106ecba ffff88011ea45c40 [18356.750305] ffff8801197c7800 0000000000000001 ffff88011ea45c40 ffff88011ea45ef8 [18356.761131] Call Trace: [18356.765163] <NMI> [<ffffffff8169e763>] dump_stack+0x45/0x57 [18356.772761] [<ffffffff8106ecba>] warn_slowpath_common+0x8a/0xc0 [18356.780580] [<ffffffff8106ed36>] warn_slowpath_fmt+0x46/0x50 [18356.788080] [<ffffffff8102f676>] ? intel_pmu_drain_pebs_nhm+0x176/0x2e0 [18356.796685] [<ffffffff8111b694>] watchdog_overflow_callback+0x84/0xa0 [18356.805063] [<ffffffff8115ae7c>] __perf_event_overflow+0x8c/0x1b0 [18356.813081] [<ffffffff8115b9d4>] perf_event_overflow+0x14/0x20 [18356.820813] [<ffffffff81032194>] intel_pmu_handle_irq+0x1d4/0x440 [18356.828795] [<ffffffff81028e76>] perf_event_nmi_handler+0x26/0x40 [18356.836761] [<ffffffff810181ad>] nmi_handle+0x9d/0x140 [18356.843764] [<ffffffff81018115>] ? nmi_handle+0x5/0x140 [18356.850868] [<ffffffff810184b9>] default_do_nmi+0xc9/0x120 [18356.858228] [<ffffffff8101859d>] do_nmi+0x8d/0xc0 [18356.864793] [<ffffffff816a86df>] end_repeat_nmi+0x1e/0x2e [18356.872062] <<EOE>> <UNK> [18356.875986] ---[ end trace 1b52d9dc94e8716a ]---
Followed by a lot of these:
[18359.393390] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 6, t=5253 jiffies, g=2341684, c=2341683, q=71) [18359.405806] Task dump for CPU 1: [18359.409688] perf_fuzzer R running task 0 27699 2386 0x00000008 [18359.417712] ffff8800cfb7c680 00007f889f330fff 0000000000000096 0000000000000002 [18359.426147] ffff8800cfb7c680 ffffffff82a107e0 0000000000000001 ffff8800c4413c28 [18359.434553] 0000000000000096 ffffffff814090e0 00007f8800000000 000000019f400000 [18359.443023] Call Trace: [18359.446107] [<ffffffff814090e0>] ? debug_check_no_obj_freed+0x90/0x200 [18359.453610] [<ffffffff81409162>] ? debug_check_no_obj_freed+0x112/0x200 [18359.461226] [<ffffffff81409162>] ? debug_check_no_obj_freed+0x112/0x200 [18359.468840] [<ffffffff811bc096>] ? kfree_debugcheck+0x16/0x40 [18359.475521] [<ffffffff8119e14e>] ? mmap_region+0x49e/0x5d0 [18359.481915] [<ffffffff8118468b>] ? vm_mmap_pgoff+0x9b/0xc0 [18359.488362] [<ffffffff810b5023>] ? up_write+0x23/0x50 [18359.494362] [<ffffffff8118468b>] ? vm_mmap_pgoff+0x9b/0xc0 [18359.500807] [<ffffffff811fbec5>] ? __fget+0x5/0xd0 [18359.506498] [<ffffffff8119c978>] ? SyS_mmap_pgoff+0xe8/0x270 [18359.513100] [<ffffffff81003012>] ? lockdep_sys_exit_thunk+0x12/0x14 [18359.520351] [<ffffffff816a64bc>] ? entry_SYSCALL_64_fastpath+0x20/0x7a
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