Greeting, FYI, we noticed the following commit (built with gcc-9): commit: e906550aca3882139a60277aa00ce2979de80a42 ("[PATCH] sched/pelt: check that *_avg are null when *_sum are") url: https://github.com/0day-ci/linux/commits/Vincent-Guittot/sched-pelt-check... base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git 475ea6c60279e9f2ddf7e4cf2648cd8ae0608361 in testcase: ltp version: ltp-x86_64-14c1f76-1_20210522 with following parameters: disk: 1HDD fs: btrfs test: io ucode: 0x21 test-description: The LTP testsuite contains a collection of tools for testing the Linux kernel and related features. test-url: http://linux-test-project.github.io/ on test machine: 4 threads 1 sockets Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz with 8G memory caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): If you fix the issue, kindly add following tag Reported-by: kernel test robot <oliver.sang(a)intel.com&gt; kern :warn : [ 40.989618] WARNING: CPU: 2 PID: 253 at kernel/sched/fair.c:8029 update_blocked_averages (kbuild/src/consumer/kernel/sched/fair.c:8029 kbuild/src/consumer/kernel/sched/fair.c:8065 kbuild/src/consumer/kernel/sched/fair.c:8152) kern :warn : [ 40.989920] Modules linked in: btrfs blake2b_generic xor zstd_compress raid6_pq libcrc32c sd_mod t10_pi sg intel_rapl_msr intel_rapl_common i915 vfio_mdev vfio_iommu_type1 vfio x86_pkg_temp_thermal intel_powerclamp coretemp mdev crct10dif_pclmul intel_gtt crc32_pclmul crc32c_intel drm_kms_helper ghash_clmulni_intel rapl ahci libahci intel_cstate syscopyarea sysfillrect sysimgblt fb_sys_fops mei_me mei ipmi_devintf usb_storage ipmi_msghandler libata drm intel_uncore video ip_tables kern :warn : [ 40.990633] CPU: 2 PID: 253 Comm: systemd-logind Not tainted 5.13.0-rc1-00127-ge906550aca38 #1 kern :warn : [ 40.990772] Hardware name: Hewlett-Packard p6-1451cx/2ADA, BIOS 8.15 02/05/2013 kern :warn : [ 40.990890] RIP: 0010:update_blocked_averages (kbuild/src/consumer/kernel/sched/fair.c:8029 kbuild/src/consumer/kernel/sched/fair.c:8065 kbuild/src/consumer/kernel/sched/fair.c:8152) kern :warn : [ 40.990981] Code: a0 a0 55 82 c6 05 eb 90 c6 01 01 e8 ae 0a b5 00 0f 0b e9 e6 f9 ff ff 48 c7 c7 30 a5 55 82 c6 05 c9 90 c6 01 01 e8 94 0a b5 00 <0f> 0b e9 1b fc ff ff 80 3d bf 90 c6 01 00 0f 85 5b ff ff ff 48 c7 All code ======== 0: a0 a0 55 82 c6 05 eb movabs 0xc690eb05c68255a0,%al 7: 90 c6 9: 01 01 add %eax,(%rcx) b: e8 ae 0a b5 00 callq 0xb50abe 10: 0f 0b ud2 12: e9 e6 f9 ff ff jmpq 0xfffffffffffff9fd 17: 48 c7 c7 30 a5 55 82 mov $0xffffffff8255a530,%rdi 1e: c6 05 c9 90 c6 01 01 movb $0x1,0x1c690c9(%rip) # 0x1c690ee 25: e8 94 0a b5 00 callq 0xb50abe 2a:* 0f 0b ud2 <-- trapping instruction 2c: e9 1b fc ff ff jmpq 0xfffffffffffffc4c 31: 80 3d bf 90 c6 01 00 cmpb $0x0,0x1c690bf(%rip) # 0x1c690f7 38: 0f 85 5b ff ff ff jne 0xffffffffffffff99 3e: 48 rex.W 3f: c7 .byte 0xc7 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: e9 1b fc ff ff jmpq 0xfffffffffffffc22 7: 80 3d bf 90 c6 01 00 cmpb $0x0,0x1c690bf(%rip) # 0x1c690cd e: 0f 85 5b ff ff ff jne 0xffffffffffffff6f 14: 48 rex.W 15: c7 .byte 0xc7 kern :warn : [ 40.991275] RSP: 0018:ffffc900005c7b90 EFLAGS: 00010086 kern :warn : [ 40.991361] RAX: 0000000000000000 RBX: ffff8881b2ace000 RCX: 0000000000000027 kern :warn : [ 40.991475] RDX: 0000000000000027 RSI: 00000000ffff7fff RDI: ffff88821fb17bf8 kern :warn : [ 40.991589] RBP: ffff88821fb2b680 R08: ffff88821fb17bf0 R09: ffffc900005c79b0 kern :warn : [ 40.991704] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88821b4ee600 kern :warn : [ 40.991818] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881b2ace140 kern :warn : [ 40.991932] FS: 00007fce7e462980(0000) GS:ffff88821fb00000(0000) knlGS:0000000000000000 kern :warn : [ 40.992062] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kern :warn : [ 40.992155] CR2: 0000555c466762f8 CR3: 000000021a9d8005 CR4: 00000000001706e0 kern :warn : [ 40.992269] Call Trace: kern :warn : [ 40.992314] newidle_balance (kbuild/src/consumer/arch/x86/include/asm/preempt.h:80 kbuild/src/consumer/include/linux/rcupdate.h:68 kbuild/src/consumer/include/linux/rcupdate.h:655 kbuild/src/consumer/kernel/sched/fair.c:10667) kern :warn : [ 40.992382] pick_next_task_fair (kbuild/src/consumer/kernel/sched/fair.c:7219) kern :warn : [ 40.992453] pick_next_task (kbuild/src/consumer/kernel/sched/core.c:5322 kbuild/src/consumer/kernel/sched/core.c:5429) kern :warn : [ 40.992518] ? dequeue_task_fair (kbuild/src/consumer/kernel/sched/fair.c:5589) kern :warn : [ 40.992588] __schedule (kbuild/src/consumer/kernel/sched/core.c:5921) kern :warn : [ 40.992649] schedule (kbuild/src/consumer/arch/x86/include/asm/preempt.h:85 (discriminator 1) kbuild/src/consumer/kernel/sched/core.c:6037 (discriminator 1)) kern :warn : [ 40.992705] schedule_hrtimeout_range_clock (kbuild/src/consumer/kernel/time/hrtimer.c:2074 (discriminator 1)) kern :warn : [ 40.992791] ? ep_done_scan (kbuild/src/consumer/include/linux/list.h:282 kbuild/src/consumer/fs/eventpoll.c:661) kern :warn : [ 40.992856] ep_poll (kbuild/src/consumer/fs/eventpoll.c:1848) kern :warn : [ 40.992911] ? finish_wait (kbuild/src/consumer/kernel/sched/wait.c:403) kern :warn : [ 40.992973] do_epoll_wait (kbuild/src/consumer/fs/eventpoll.c:2226) kern :warn : [ 40.993035] __x64_sys_epoll_wait (kbuild/src/consumer/fs/eventpoll.c:2233) kern :warn : [ 40.993105] ? syscall_trace_enter+0x99/0x1c0 kern :warn : [ 40.993187] do_syscall_64 (kbuild/src/consumer/arch/x86/entry/common.c:47) kern :warn : [ 40.993249] entry_SYSCALL_64_after_hwframe (kbuild/src/consumer/arch/x86/entry/entry_64.S:112) kern :warn : [ 40.993333] RIP: 0033:0x7fce7f5c77b7 kern :warn : [ 40.993394] Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8d 05 49 6f 0c 00 41 89 ca 8b 00 85 c0 75 10 b8 e8 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 59 c3 41 55 41 89 cd 41 54 41 89 d4 55 48 89 All code ======== 0: 83 c8 ff or $0xffffffff,%eax 3: c3 retq 4: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) b: 00 00 00 e: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 13: 48 8d 05 49 6f 0c 00 lea 0xc6f49(%rip),%rax # 0xc6f63 1a: 41 89 ca mov %ecx,%r10d 1d: 8b 00 mov (%rax),%eax 1f: 85 c0 test %eax,%eax 21: 75 10 jne 0x33 23: b8 e8 00 00 00 mov $0xe8,%eax 28: 0f 05 syscall 2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 59 ja 0x8b 32: c3 retq 33: 41 55 push %r13 35: 41 89 cd mov %ecx,%r13d 38: 41 54 push %r12 3a: 41 89 d4 mov %edx,%r12d 3d: 55 push %rbp 3e: 48 rex.W 3f: 89 .byte 0x89 Code starting with the faulting instruction =========================================== 0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 6: 77 59 ja 0x61 8: c3 retq 9: 41 55 push %r13 b: 41 89 cd mov %ecx,%r13d e: 41 54 push %r12 10: 41 89 d4 mov %edx,%r12d 13: 55 push %rbp 14: 48 rex.W 15: 89 .byte 0x89 kern :warn : [ 40.993687] RSP: 002b:00007ffffe994368 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 kern :warn : [ 40.993809] RAX: ffffffffffffffda RBX: 000055e5ff172d60 RCX: 00007fce7f5c77b7 kern :warn : [ 40.993923] RDX: 000000000000000f RSI: 00007ffffe994370 RDI: 0000000000000004 kern :warn : [ 40.994038] RBP: 00007ffffe994520 R08: 000000000000034f R09: 00007ffffe994370 kern :warn : [ 40.994152] R10: 00000000ffffffff R11: 0000000000000246 R12: ffffffffffffffff kern :warn : [ 40.994266] R13: 0000000000000001 R14: 00007ffffe994618 R15: 00007ffffe994370 kern :warn : [ 40.994381] ---[ end trace 794dc830ae459150 ]--- user :notice: [ 41.030869] Setting up libpython3-stdlib:amd64 (3.7.3-1) ... user :notice: [ 41.032091] Setting up python3 (3.7.3-1) ... user :notice: [ 41.036890] running python rtupdate hooks for python3.7... user :notice: [ 41.039334] running python post-rtupdate hooks for python3.7... user :notice: [ 41.118424] Setting up libf2fs-format4:amd64 (1.11.0-1.1) ... user :notice: [ 41.119823] Processing triggers for systemd (241-7~deb10u4) ... user :notice: [ 41.228905] Processing triggers for libc-bin (2.28-10) ... user :notice: [ 41.237592] Processing triggers for mime-support (3.62) ... user :notice: [ 41.248818] Processing triggers for dbus (1.12.16-1) ... user :notice: [ 47.365583] 2 Jun 05:10:21 ntpdate[2337]: step time server 192.168.1.200 offset 2795.016514 sec kern :info : [ 47.378243] netpoll: netconsole: local port 6665 kern :info : [ 47.378326] netpoll: netconsole: local IPv4 address 0.0.0.0 kern :info : [ 47.378417] netpoll: netconsole: interface 'eth0' kern :info : [ 47.378494] netpoll: netconsole: remote port 6679 kern :info : [ 47.378570] netpoll: netconsole: remote IPv4 address 192.168.3.200 kern :info : [ 47.378681] netpoll: netconsole: remote ethernet address ff:ff:ff:ff:ff:ff kern :info : [ 47.378798] netpoll: netconsole: local IP 192.168.3.102 kern :info : [ 47.378931] printk: console [netcon0] enabled kern :info : [ 47.379012] netconsole: network logging started kern :info : [ 47.392683] BTRFS info (device sda1): disk space caching is enabled kern :info : [ 47.392797] BTRFS info (device sda1): has skinny extents kern :info : [ 47.405066] BTRFS info (device sda1): enabling ssd optimizations user :notice: [ 47.410266] /lkp/lkp/src/bin/run-lkp kern :info : [ 48.300364] device-mapper: uevent: version 1.0.3 kern :info : [ 48.300513] device-mapper: ioctl: 4.45.0-ioctl (2021-03-22) initialised: dm-devel(a)redhat.com kern :info : [ 48.626173] BTRFS: device fsid 38013e90-db69-4082-b755-a238335d3736 devid 1 transid 5 /dev/sdb1 scanned by mkfs.btrfs (2445) kern :info : [ 48.635047] BTRFS info (device sdb1): disk space caching is enabled kern :info : [ 48.635160] BTRFS info (device sdb1): has skinny extents kern :info : [ 48.635259] BTRFS info (device sdb1): flagging fs with big metadata feature kern :info : [ 48.638422] BTRFS info (device sdb1): checking UUID tree kern :err : [ 48.698828] x86/PAT: bmc-watchdog:2518 map pfn expected mapping type uncached-minus for [mem 0xd8d1e000-0xd8d1efff], got write-back kern :err : [ 48.699060] x86/PAT: bmc-watchdog:2518 map pfn expected mapping type uncached-minus for [mem 0xd8d1e000-0xd8d1efff], got write-back kern :err : [ 48.722029] x86/PAT: bmc-watchdog:2518 map pfn expected mapping type uncached-minus for [mem 0xd8d1e000-0xd8d1efff], got write-back kern :err : [ 48.722246] x86/PAT: bmc-watchdog:2518 map pfn expected mapping type uncached-minus for [mem 0xd8d1e000-0xd8d1efff], got write-back kern :err : [ 48.745168] x86/PAT: bmc-watchdog:2518 map pfn expected mapping type uncached-minus for [mem 0xd8d1e000-0xd8d1efff], got write-back kern :err : [ 48.745381] x86/PAT: bmc-watchdog:2518 map pfn expected mapping type uncached-minus for [mem 0xd8d1e000-0xd8d1efff], got write-back kern :err : [ 48.768242] x86/PAT: bmc-watchdog:2518 map pfn expected mapping type uncached-minus for [mem 0xd8d1e000-0xd8d1efff], got write-back To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run bin/lkp run generated-yaml-file --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang