FYI, we noticed the following commit: git://bee.sh.intel.com/git/aaron/linux.git lck1376 commit 7361bbc30e1cb9ddee70ff6895cf29256ab35418 ("lck1376: avoid global atomic for huge_zero_page") in testcase: ltp with following parameters: test=mm on test machine: nhm-white2: 8 threads Nehalem with 4G memory caused below changes: +------------------------------------------+------------+------------+ | | d325ea8594 | 7361bbc30e | +------------------------------------------+------------+------------+ | boot_successes | 46 | 19 | | boot_failures | 4 | 4 | | invoked_oom-killer:gfp_mask=0x | 4 | | | Mem-Info | 4 | | | Out_of_memory:Kill_process | 4 | | | backtrace:vfs_write | 3 | | | backtrace:SyS_write | 3 | | | kernel_BUG_at_mm/huge_memory.c | 0 | 4 | | invalid_opcode:#[##]SMP | 0 | 4 | | RIP:put_huge_zero_page | 0 | 4 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 4 | | backtrace:do_group_exit | 0 | 4 | | backtrace:SyS_exit_group | 0 | 4 | +------------------------------------------+------------+------------+ [ 18.551742] Key type id_legacy registered [ 19.981339] loop: module loaded [ 24.980427] ------------[ cut here ]------------ [ 24.980806] kernel BUG at mm/huge_memory.c:257! [ 24.981155] invalid opcode: 0000 [#1] SMP [ 24.981478] Modules linked in: loop rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver netconsole sg sr_mod sd_mod cdrom dcdbas snd_hda_codec_realtek snd_hda_codec_generic coretemp kvm_intel kvm ata_generic pata_acpi irqbypass snd_hda_codec_hdmi crc32c_intel ata_piix i7core_edac serio_raw pcspkr edac_core libata usb_storage snd_hda_intel snd_hda_codec firewire_ohci snd_hda_core firewire_core crc_itu_t snd_hwdep snd_pcm snd_timer snd soundcore shpchp acpi_cpufreq broadcom bcm_phy_lib [ 24.985517] CPU: 6 PID: 850 Comm: mmstress Not tainted 4.7.0-rc3-00056-g7361bbc #1 [ 24.985984] Hardware name: Dell Inc. Studio XPS 8000/0X231R, BIOS A01 08/11/2009 [ 24.986447] task: ffff880029b12480 ti: ffff88008cde8000 task.ti: ffff88008cde8000 [ 24.986908] RIP: 0010:[<ffffffff811e61d4>] [<ffffffff811e61d4>] put_huge_zero_page+0x14/0x20 [ 24.987475] RSP: 0018:ffff88008cdebe70 EFLAGS: 00010246 [ 24.987792] RAX: 0000000000000001 RBX: ffff88008d7326c0 RCX: 0000000180660064 [ 24.988179] RDX: 0000000180660065 RSI: ffffea00049f72c0 RDI: 0000000040000000 [ 24.988646] RBP: ffff88008cdebe70 R08: 0000000027dcb501 R09: 0000000180660064 [ 24.989041] R10: ffff88013fd9c000 R11: ffff880127dcb550 R12: ffff880029b12fb0 [ 24.989430] R13: ffff88008d7326c0 R14: 0000000000000001 R15: ffff88008d732730 [ 24.989828] FS: 0000000000000000(0000) GS:ffff88013fd80000(0000) knlGS:0000000000000000 [ 24.990321] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.990664] CR2: 0000000000610268 CR3: 0000000029a46000 CR4: 00000000000006e0 [ 24.991063] Stack: [ 24.991233] ffff88008cdebe90 ffffffff8107aa8e ffff880029b12480 ffff880029b12fb0 [ 24.991944] ffff88008cdebf08 ffffffff81081685 ffff880029b12fb4 000000008cdebf58 [ 24.992571] ffff88008cdebf18 ffffffff8106612c ffff88008bff67e8 0000000000000008 [ 24.993197] Call Trace: [ 24.993447] [<ffffffff8107aa8e>] mmput+0x11e/0x130 [ 24.993761] [<ffffffff81081685>] do_exit+0x335/0xb70 [ 24.994070] [<ffffffff8106612c>] ? __do_page_fault+0x21c/0x4d0 [ 24.994460] [<ffffffff81081f45>] do_group_exit+0x45/0xb0 [ 24.994792] [<ffffffff81081fc4>] SyS_exit_group+0x14/0x20 [ 24.995122] [<ffffffff81917372>] entry_SYSCALL_64_fastpath+0x1a/0xa4 [ 24.995484] Code: f0 49 ff 44 24 50 b8 01 00 00 00 5b 41 5c 41 5d 41 5e 5d c3 0f 1f 00 66 66 66 66 90 55 48 89 e5 f0 ff 0d 70 1b 1a 01 74 02 5d c3 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 8b 47 58 85 [ 24.998924] RIP [<ffffffff811e61d4>] put_huge_zero_page+0x14/0x20 [ 24.999317] RSP <ffff88008cdebe70> [ 24.999586] ---[ end trace 66e4ec04d53c3feb ]--- [ 24.999858] Kernel panic - not syncing: Fatal exception 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