Hi. We are seeing kernel watchdog warnings on Linux 3.4.78 on several different machines. The warning occurs occasionally when there are multiple instances of perf stat with an event list each tracing a different process. This isn't a recent regression as we saw this happen with earlier versions of 3.4.y too.
Here is the typical stack trace. ------------[ cut here ]------------ WARNING: at kernel/watchdog.c:241 watchdog_overflow_callback+0x9b/0xa6() Watchdog detected hard LOCKUP on cpu 4 Modules linked in: netconsole configfs ipv6 dm_multipath video sbs sbshc acpi_pad acpi_memhotplug acpi_ipmi parport_pc lp parport tcp_diag inet_diag ipmi_si ipmi_d andler igb dcdbas hed sb_edac i2c_i801 ioatdma i2c_core iTCO_wdt shpchp iTCO_vendor_support edac_core wmi dca microcode Pid: 20128, comm: java Not tainted 3.4.78 #1 Call Trace: <NMI> [<ffffffff8103c20c>] warn_slowpath_common+0x85/0x9d [<ffffffff8103c2c7>] warn_slowpath_fmt+0x46/0x48 [<ffffffff810689db>] ? sched_clock_cpu+0x44/0xce [<ffffffff810ad7c4>] watchdog_overflow_callback+0x9b/0xa6 [<ffffffff810dbae7>] __perf_event_overflow+0x137/0x1c1 [<ffffffff8100fa36>] ? x86_perf_event_set_period+0x107/0x113 [<ffffffff810dbeeb>] perf_event_overflow+0x14/0x16 [<ffffffff81014406>] intel_pmu_handle_irq+0x263/0x2e0 [<ffffffff814bcc8f>] perf_event_nmi_handler+0x19/0x1b [<ffffffff814bc663>] default_do_nmi+0x66/0x1d4 [<ffffffff814bc841>] do_nmi+0x70/0xbb [<ffffffff814bbd0c>] end_repeat_nmi+0x1a/0x1e <<EOE>> ---[ end trace 6a76b814d8600490 ]--- Cheers, Vinson -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
