FYI, we noticed the following commit: https://github.com/0day-ci/linux David-Carrillo-Cisneros/remove-unnecessary-IPI-reading-uncore-events/20160818-045857 commit 412929295ff670aa6890e346e2fc05f58d93cd96 ("perf/core: check return value of perf_event_read IPI") in testcase: postmark with following parameters: disk: 1HDD fs: ext4 fs1: nfsv4 number: 20000n trans: 100000s subdirs: 100d on test machine: 4 threads Intel(R) Atom(TM) CPU S1240 @ 1.60GHz with 8G memory caused below changes: +------------------------------------------------------------------+------------+------------+ | | e48c178814 | 412929295f | +------------------------------------------------------------------+------------+------------+ | boot_successes | 0 | 4 | | boot_failures | 4 | 9 | | invoked_oom-killer:gfp_mask=0x | 4 | 3 | | Mem-Info | 4 | 2 | | Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 2 | 2 | | WARNING:at_kernel/events/core.c:#perf_event_read | 0 | 5 | | calltrace:SyS_read | 0 | 5 | | BUG:kernel_reboot-without-warning_in_test_stage | 0 | 2 | +------------------------------------------------------------------+------------+------------+ [ 97.852491] ipmi device interface [ 97.994091] BMC ARP Control : ARP Responses Enabled, Gratuitous ARP Disabled [ 407.987666] ------------[ cut here ]------------ [ 408.001711] WARNING: CPU: 2 PID: 600 at kernel/events/core.c:3530 perf_event_read+0x17d/0x190 [ 408.017980] Modules linked in: ipmi_devintf nfsd dm_mod rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sg sd_mod ast ttm drm_kms_helper syscopyarea sysfillrect ie6xx_wdt sysimgblt fb_sys_fops i2c_isch intel_powerclamp coretemp ahci drm libahci libata kvm_intel snd_pcm kvm snd_timer irqbypass snd soundcore pcspkr ipmi_si i2c_ismt ipmi_msghandler lpc_sch shpchp acpi_cpufreq [ 408.071520] CPU: 2 PID: 600 Comm: perf Not tainted 4.8.0-rc1-00041-g4129292 #1 [ 408.085106] Hardware name: To be filled by O.E.M. To be filled by O.E.M./Double Cove , BIOS BWDEXT.86B.000.012.D127 10/08/2012 [ 408.109181] 0000000000000000 ffff88023916fcf0 ffffffff8144bd99 0000000000000000 [ 408.123022] 0000000000000000 ffff88023916fd30 ffffffff8107e6cb 00000dca0000000d [ 408.136695] ffff8801f9bc9800 0000000000000000 0000000000000003 ffff8801f9bc9800 [ 408.149723] Call Trace: [ 408.157564] [<ffffffff8144bd99>] dump_stack+0x63/0x8a [ 408.168028] [<ffffffff8107e6cb>] __warn+0xcb/0xf0 [ 408.178003] [<ffffffff8107e7bd>] warn_slowpath_null+0x1d/0x20 [ 408.188919] [<ffffffff81168f8d>] perf_event_read+0x17d/0x190 [ 408.199648] [<ffffffff81168fe5>] perf_event_read_value+0x45/0x130 [ 408.210680] [<ffffffff8116d3ab>] perf_read+0x17b/0x2b0 [ 408.220656] [<ffffffff8120c528>] __vfs_read+0x28/0x110 [ 408.230485] [<ffffffff813d8590>] ? security_file_permission+0xa0/0xc0 [ 408.241569] [<ffffffff8120c9be>] ? rw_verify_area+0x4e/0xb0 [ 408.251709] [<ffffffff8120cab6>] vfs_read+0x96/0x130 [ 408.261173] [<ffffffff8120dea6>] SyS_read+0x46/0xa0 [ 408.270426] [<ffffffff8192e9b2>] entry_SYSCALL_64_fastpath+0x1a/0xa4 [ 408.281217] ---[ end trace ebd31c6575c28d79 ]--- -- To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Xiaolong