On Mon, Mar 10, 2014 at 01:53:19PM +0100, Jiri Olsa wrote: > On Sat, Mar 08, 2014 at 02:51:53PM +0800, Fengguang Wu wrote: > > > > Hi all, > > > > This is a very old WARNING, too old to be bisectable. The below 3 different > > back traces show that it's always triggered by trinity at system reboot > > time. > > Any ideas to quiet it? Thank you! > > hi, > is there cpu hotplug involved? like writing to: > /sys/devices/system/cpu/cpu*/online >
I think there's race with hotplug code, I can reproduce this with: $ ./perf record -e faults ./perf bench sched pipe and put one of the cpus offline: [root@krava cpu]# pwd /sys/devices/system/cpu [root@krava cpu]# echo 0 > cpu1/online working on fix ;-) thanks, jirka --- [ 133.726229] ------------[ cut here ]------------ [ 133.726236] WARNING: CPU: 1 PID: 1194 at kernel/events/core.c:5640 perf_swevent_add+0x112/0x120() [ 133.726237] Modules linked in: ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat xt_CHECKSUM iptable_mangle tun bridge stp llc ccm nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack snd_hda_codec_hdmi snd_hda_codec_conexant uvcvideo x86_pkg_temp_thermal coretemp snd_hda_intel kvm_intel arc4 iwldvm videobuf2_vmalloc kvm snd_hda_codec videobuf2_memops snd_hwdep videobuf2_core mac80211 videodev sdhci_pci iTCO_wdt iTCO_vendor_support sdhci lpc_ich microcode iwlwifi media snd_seq snd_seq_device snd_pcm i2c_i801 serio_raw cfg80211 mfd_core mmc_core btusb mei_me shpchp snd_page_alloc bluetooth snd_timer nfsd e1000e mei ptp auth_rpcgss pps_core thinkpad_acpi nfs_acl lockd snd soundcore rfkill sunrpc wmi binfmt_misc dm_crypt i915 crct10dif_pclmul crc32_pclmul [ 133.726266] i2c_algo_bit drm_kms_helper crc32c_intel drm i2c_core ghash_clmulni_intel video [ 133.726270] CPU: 1 PID: 1194 Comm: sched-pipe Not tainted 3.13.5-103.fc19.x86_64 #1 [ 133.726271] Hardware name: LENOVO 4291EJ3/4291EJ3, BIOS 8DET56WW (1.26 ) 12/01/2011 [ 133.726272] 0000000000000009 ffff8802091c5b18 ffffffff81680604 0000000000000000 [ 133.726274] ffff8802091c5b50 ffffffff8106d35d ffff880209084c00 ffff8800d015ec00 [ 133.726276] ffff88021e257748 ffff88021e25774c 00000000227a1324 ffff8802091c5b60 [ 133.726277] Call Trace: [ 133.726282] [<ffffffff81680604>] dump_stack+0x45/0x56 [ 133.726285] [<ffffffff8106d35d>] warn_slowpath_common+0x7d/0xa0 [ 133.726287] [<ffffffff8106d43a>] warn_slowpath_null+0x1a/0x20 [ 133.726289] [<ffffffff8113a9b2>] perf_swevent_add+0x112/0x120 [ 133.726291] [<ffffffff8113ea70>] event_sched_in.isra.78+0x90/0x1d0 [ 133.726293] [<ffffffff8113ec1a>] group_sched_in+0x6a/0x1e0 [ 133.726296] [<ffffffff8101b1c3>] ? native_sched_clock+0x13/0x80 [ 133.726297] [<ffffffff8101b239>] ? sched_clock+0x9/0x10 [ 133.726299] [<ffffffff8113ee9e>] ctx_sched_in+0x10e/0x1d0 [ 133.726300] [<ffffffff8113efc0>] perf_event_sched_in+0x60/0x90 [ 133.726302] [<ffffffff8113f468>] perf_event_context_sched_in+0x78/0xc0 [ 133.726303] [<ffffffff8113fb62>] __perf_event_task_sched_in+0x182/0x1a0 [ 133.726306] [<ffffffff8109a238>] finish_task_switch+0xa8/0xf0 [ 133.726308] [<ffffffff81683b52>] __schedule+0x2e2/0x740 [ 133.726310] [<ffffffff81683fd9>] schedule+0x29/0x70 [ 133.726313] [<ffffffff811c0301>] pipe_wait+0x61/0xa0 [ 133.726315] [<ffffffff810ae8a0>] ? abort_exclusive_wait+0xb0/0xb0 [ 133.726316] [<ffffffff811c0bbd>] pipe_read+0x2fd/0x4f0 [ 133.726319] [<ffffffff811b781a>] do_sync_read+0x5a/0x90 [ 133.726321] [<ffffffff811b7e85>] vfs_read+0x95/0x160 [ 133.726322] [<ffffffff811b8999>] SyS_read+0x49/0xa0 [ 133.726325] [<ffffffff8168f5e9>] system_call_fastpath+0x16/0x1b [ 133.726326] ---[ end trace 75f3a06e52d51e52 ]--- [ 133.731360] kvm: disabling virtualization on CPU1 [ 133.731367] smpboot: CPU 1 is now offline -- 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/
