Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/cpu commit a7aafd3922587ffc7590310d543ed6a6e8a1e355 Author: Andy Lutomirski <luto(a)kernel.org&gt; AuthorDate: Tue Jun 18 16:48:21 2019 -0700 Commit: Andy Lutomirski <luto(a)kernel.org&gt; CommitDate: Tue Jun 18 16:48:21 2019 -0700 assertions for "x86/fsgsbase/64: Enable FSGSBASE instructions in helper functions" e31ce026b4 Documentation/x86/64: Add documentation for GS/FS addressing mode a7aafd3922 assertions for "x86/fsgsbase/64: Enable FSGSBASE instructions in helper functions" d6d8c330a7 Tiny fixup for "x86/entry/64: Handle FSGSBASE enabled paranoid entry/exit" +--------------------------------------------------------------+------------+------------+------------+ | | e31ce026b4 | a7aafd3922 | d6d8c330a7 | +--------------------------------------------------------------+------------+------------+------------+ | boot_successes | 39 | 4 | 0 | | boot_failures | 14 | 18 | 16 | | BUG:kernel_hang_in_boot-around-mounting-root_stage | 13 | 4 | 1 | | Mem-Info | 1 | | | | BUG:kernel_reboot-without-warning_in_test_stage | 0 | 2 | | | BUG:soft_lockup-CPU##stuck_for#s | 0 | 1 | | | RIP:memset_orig | 0 | 1 | | | Kernel_panic-not_syncing:softlockup:hung_tasks | 0 | 1 | | | WARNING:at_arch/x86/kernel/process_64.c:#__rdgsbase_inactive | 0 | 13 | 16 | | RIP:__rdgsbase_inactive | 0 | 13 | 16 | +--------------------------------------------------------------+------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <lkp(a)intel.com&gt; [ 3.266945] Spectre V2 : Spectre mitigation: kernel not compiled with retpoline; no mitigation available! [ 3.266957] Speculative Store Bypass: Vulnerable [ 3.280762] MDS: Vulnerable: Clear CPU buffers attempted, no microcode [ 3.289201] ------------[ cut here ]------------ [ 3.296939] IRQs not disabled as expected [ 3.300499] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/process_64.c:173 __rdgsbase_inactive+0xc9/0x100 [ 3.306882] Modules linked in: [ 3.306882] CPU: 0 PID: 0 Comm: swapper Tainted: G T 5.2.0-rc4-00022-ga7aafd3 #2 [ 3.306882] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 3.306882] RIP: 0010:__rdgsbase_inactive+0xc9/0x100 [ 3.306882] Code: 00 00 31 d2 be 01 00 00 00 48 c7 c7 60 59 d4 82 c6 05 f8 9e d2 01 01 e8 e5 40 1f 00 48 c7 c7 18 e7 76 82 31 c0 e8 97 43 0d 00 <0f> 0b be 01 00 00 00 b9 01 00 00 00 31 d2 48 c7 c7 30 59 d4 82 e8 [ 3.306882] RSP: 0000:ffffffff82a07cb0 EFLAGS: 00010286 [ 3.306882] RAX: 000000000000001d RBX: 0000000000000001 RCX: ffffffff8114f96f [ 3.306882] RDX: 0000000000000007 RSI: dffffc0000000000 RDI: ffffffff82a3a8dc [ 3.306882] RBP: ffffffff82a3a8c0 R08: fffffbfff054b905 R09: 0000000000000000 [ 3.306882] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88801a30ff58 [ 3.306882] R13: ffff88801a308000 R14: ffffffff82a3ccb0 R15: ffffffff81ecd7e0 [ 3.306882] FS: 0000000000000000(0000) GS:ffffffff82a49000(0000) knlGS:0000000000000000 [ 3.306882] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3.306882] CR2: 00000000ffffffff CR3: 0000000002a33000 CR4: 00000000001506b0 [ 3.306882] Call Trace: [ 3.306882] copy_thread_tls+0xf2/0x590 [ 3.306882] ? ftrace_likely_update+0x2c/0x60 [ 3.306882] ? copy_namespaces+0xdc/0x1b0 [ 3.306882] copy_process+0x21e0/0x3da0 [ 3.306882] ? rest_init+0x140/0x140 [ 3.306882] _do_fork+0xe2/0x650 [ 3.306882] ? acpi_hw_register_read+0xfe/0x109 [ 3.306882] ? acpi_read_bit_register+0x73/0x84 [ 3.306882] ? rest_init+0x140/0x140 [ 3.306882] kernel_thread+0x2f/0x40 [ 3.306882] rest_init+0x22/0x140 [ 3.306882] start_kernel+0x883/0x8b3 [ 3.306882] secondary_startup_64+0xb6/0xc0 [ 3.306882] irq event stamp: 4658 [ 3.306882] hardirqs last enabled at (4657): [<ffffffff8115d2b1>] console_unlock+0x421/0x660 [ 3.306882] hardirqs last disabled at (4658): [<ffffffff810020eb>] trace_hardirqs_off_thunk+0x1a/0x1c [ 3.306882] softirqs last enabled at (4646): [<ffffffff82200494>] __do_softirq+0x494/0x525 [ 3.306882] softirqs last disabled at (4639): [<ffffffff810ea519>] irq_exit+0xc9/0xe0 [ 3.306882] random: get_random_bytes called from init_oops_id+0x30/0x40 with crng_init=0 [ 3.306882] ---[ end trace 00f3be06b399857d ]--- [ 3.322263] Performance Events: no PMU driver, software events only. # HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD git bisect start 5b08f90b003be883c2894a2922917f4cd271d294 9e0babf2c06c73cda2c0cd37a1653d823adb40ec -- git bisect bad 4a1a4f130bd632752c6413c5a6365dde58c0d0de # 15:39 B 1 4 1 1 Merge 'kristo/j721-next' into devel-catchup-201906190948 git bisect bad 71432521a98a0e236709cb5216d7579e75ec5c14 # 16:23 B 0 1 16 0 Merge 'linux-review/Hugues-Fruchet/media-st-mipid02-add-support-of-V4L2_CID_LINK_FREQ/20190619-040124' into devel-catchup-201906190948 git bisect bad 9beaf8bbf8cb1dec2e04a49220f2949c772d92d3 # 17:15 B 1 2 0 0 Merge 'linux-review/Andreas-Gruenbacher/fs-Move-mark_inode_dirty-out-of-__generic_write_end/20190619-061402' into devel-catchup-201906190948 git bisect good b76ae927febf4b66b66db71b26f39e62b6ceed79 # 18:13 G 13 0 2 2 Merge 'saeed/net-next' into devel-catchup-201906190948 git bisect bad b121ef1c28e1df18a5186f6b3610ba6b2894701f # 18:58 B 0 1 16 0 Merge 'linux-review/Dmitry-Osipenko/media-dt-bindings-tegra-vde-Document-new-optional-IOMMU-property/20190619-083111' into devel-catchup-201906190948 git bisect bad d4d5c6f4336c58a31794bf5c736e4601590e756a # 19:27 B 1 1 0 0 Merge 'luto/x86/cpu' into devel-catchup-201906190948 git bisect good c5621190083376929259b7e937b09c38ddb7a9a9 # 20:07 G 15 0 4 4 x86/process/64: Use FSGSBASE instructions on thread copy git bisect good ce21b2c3f5494fccea262ff3c34f8fca180b04c2 # 20:30 G 15 0 1 1 selftests/x86/fsgsbase: Test RD/WRGSBASE git bisect good 948cb19b6709fd68b17baf9fb88f3febe49cc079 # 20:54 G 16 0 2 2 x86/elf: Enumerate kernel FSGSBASE capability in AT_HWCAP2 git bisect bad a7aafd3922587ffc7590310d543ed6a6e8a1e355 # 21:24 B 0 1 16 0 assertions for "x86/fsgsbase/64: Enable FSGSBASE instructions in helper functions" git bisect good e31ce026b4b141e3245fde4b7698e310b20e056e # 22:19 G 15 0 4 4 Documentation/x86/64: Add documentation for GS/FS addressing mode # first bad commit: [a7aafd3922587ffc7590310d543ed6a6e8a1e355] assertions for "x86/fsgsbase/64: Enable FSGSBASE instructions in helper functions" git bisect good e31ce026b4b141e3245fde4b7698e310b20e056e # 22:28 G 48 0 9 13 Documentation/x86/64: Add documentation for GS/FS addressing mode # extra tests on HEAD of linux-devel/devel-catchup-201906190948 git bisect bad 5b08f90b003be883c2894a2922917f4cd271d294 # 22:29 B 12 289 0 79 0day head guard for 'devel-catchup-201906190948' # extra tests on tree/branch luto/x86/cpu git bisect bad d6d8c330a77ce5816d2683e3fc58ee8ae8bfa676 # 23:05 B 0 1 16 0 Tiny fixup for "x86/entry/64: Handle FSGSBASE enabled paranoid entry/exit" # extra tests with first bad commit reverted git bisect good a887489e9faf1d68ffe99c258474306069eb6585 # 23:48 G 15 0 2 2 Revert "assertions for "x86/fsgsbase/64: Enable FSGSBASE instructions in helper functions"" --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation