FYI, we noticed the following commit (built with gcc-7): commit: 96b9c592def5d7203bdad1337d9c92a2183de5cb ("cgroup: get rid of cgroup_freezer_frozen_exit()") grep: /cephfs/kbuild/commit-list/aaron/aaron:batch_size-phas1_1: in testcase: kernel_selftests with following parameters: group: kselftests-02 test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel. test-url: https://www.kernel.org/doc/Documentation/kselftest.txt on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 4G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +-------------------------------------------------+------------+------------+ | | cb2c4cd878 | 96b9c592de | +-------------------------------------------------+------------+------------+ | boot_successes | 9 | 0 | | boot_failures | 3 | 13 | | BUG:kernel_reboot-without-warning_in_test_stage | 3 | | | WARNING:at_kernel/cgroup/cgroup.c:#cgroup_exit | 0 | 13 | | RIP:cgroup_exit | 0 | 13 | +-------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <rong.a.chen(a)intel.com&gt; [ 325.042710] WARNING: CPU: 0 PID: 18857 at kernel/cgroup/cgroup.c:5929 cgroup_exit+0x148/0x160 [ 325.044998] Modules linked in: ramoops reed_solomon dccp_ipv6 dccp_ipv4 dccp ip_vti ip6_vti fou6 sit ipip tunnel4 geneve esp6 xfrm6_mode_tunnel authenc echainiv xfrm4_mode_tunnel xt_policy iptable_filter veth netdevsim esp4 xfrm4_mode_transport vxlan 8021q garp mrp bridge stp llc ip6_gre ip6_tunnel tunnel6 ip_gre gre cls_u32 sch_htb dummy fou ip6_udp_tunnel udp_tunnel ip_tunnel fuse binfmt_misc sr_mod cdrom sg ata_generic pata_acpi crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel bochs_drm ttm drm_kms_helper syscopyarea sysfillrect ppdev sysimgblt fb_sys_fops snd_pcm drm snd_timer ata_piix aesni_intel crypto_simd snd cryptd glue_helper joydev libata soundcore serio_raw pcspkr i2c_piix4 parport_pc floppy parport ip_tables [last unloaded: test_bpf] [ 325.061639] CPU: 0 PID: 18857 Comm: peeksiginfo Not tainted 5.1.0-rc3-00053-g96b9c59 #1 [ 325.063757] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 325.066185] RIP: 0010:cgroup_exit+0x148/0x160 [ 325.068018] Code: 0f 84 50 ff ff ff 48 8b 85 c8 0c 00 00 48 8b 78 70 e8 ec 2e 00 00 e9 3b ff ff ff f0 ff 43 60 0f 88 7d 41 89 00 e9 48 ff ff ff <0f> 0b e9 1b ff ff ff e8 3c 73 f4 ff 66 66 2e 0f 1f 84 00 00 00 00 [ 325.073162] RSP: 0018:ffffbdc1c203fd38 EFLAGS: 00010002 [ 325.074993] RAX: ffff9f567ec8bb50 RBX: ffff9f567efdc800 RCX: dead000000000200 [ 325.077384] RDX: ffff9f567efdc880 RSI: ffff9f5676d0bb50 RDI: ffff9f5676d0bb50 [ 325.079696] RBP: ffff9f5676d0ae80 R08: ffff9f5676d0af18 R09: 0000000000000000 [ 325.081784] R10: 0000000000000000 R11: 0000000000000001 R12: ffff9f5676d0b901 [ 325.084185] R13: ffff9f5676d0ae80 R14: ffff9f56483555b0 R15: ffff9f5676d0b9f0 [ 325.086498] FS: 0000000000000000(0000) GS:ffff9f573fc00000(0000) knlGS:0000000000000000 [ 325.088818] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 325.090921] CR2: 0000560d5e6ea268 CR3: 000000009940e000 CR4: 00000000000406f0 [ 325.093339] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 325.095761] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 325.098147] Call Trace: [ 325.099879] do_exit+0x337/0xc40 [ 325.101679] do_group_exit+0x3a/0xa0 [ 325.103515] get_signal+0x12e/0x8d0 [ 325.105023] do_signal+0x36/0x650 [ 325.106542] ? async_page_fault+0x1e/0x30 [ 325.108260] exit_to_usermode_loop+0x89/0xf0 [ 325.110046] syscall_return_slowpath+0xce/0x100 [ 325.111686] ret_from_fork+0x15/0x40 [ 325.113434] RIP: 0033:0x7f732695d7be [ 325.115124] Code: Bad RIP value. [ 325.116869] RSP: 002b:00007ffe524ce330 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 [ 325.118905] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f732695d7be [ 325.120984] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 [ 325.123223] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f7326a59500 [ 325.125376] R10: 00007f7326a597d0 R11: 0000000000000246 R12: 0000560d5d13a9a0 [ 325.127664] R13: 00007ffe524ce9e0 R14: 0000000000000000 R15: 0000000000000000 [ 325.129760] ---[ end trace c2bfe6fc337871f9 ]--- To reproduce: # build kernel cd linux cp config-5.1.0-rc3-00053-g96b9c59 .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email Thanks, Rong Chen