FYI, we noticed the following commit (built with gcc-7): commit: 1a39381d70000f0097ec6e2ceb75812d6c00b2f1 ("x86: alternatives: macrofy locks for better inlining") url: https://github.com/0day-ci/linux/commits/Nadav-Amit/x86-macrofying-inline-asm-for-better-compilation/20180605-124313 in testcase: trinity with following parameters: runtime: 300s test-description: Trinity is a linux system call fuzz tester. test-url: http://codemonkey.org.uk/projects/trinity/ on test machine: qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -m 512M caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +-----------------------------------------------------------------------------------------+------------+------------+ | | 2c1316126e | 1a39381d70 | +-----------------------------------------------------------------------------------------+------------+------------+ | boot_successes | 0 | 0 | | boot_failures | 18 | 17 | | WARNING:at_lib/debugobjects.c:#__debug_object_init | 18 | | | RIP:__debug_object_init | 18 | | | WARNING:at_kernel/locking/mutex.c:#__mutex_unlock_slowpath | 0 | 17 | | RIP:__mutex_unlock_slowpath | 0 | 17 | | WARNING:at_arch/x86/kernel/idt.c:#update_intr_gate | 0 | 17 | | RIP:update_intr_gate | 0 | 17 | | page_allocation_failure:order:#,mode:#(),nodemask=(null) | 0 | 17 | | Mem-Info | 0 | 17 | | Kernel_panic-not_syncing:kmem_cache_create:Failed_to_create_slab'radix_tree_node'.Error | 0 | 17 | +-----------------------------------------------------------------------------------------+------------+------------+ [ 0.000000] WARNING: CPU: 0 PID: 0 at kernel/locking/mutex.c:1032 __mutex_unlock_slowpath+0x1ff/0x2a0 [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.17.0-00004-g1a39381 #2 [ 0.000000] RIP: 0010:__mutex_unlock_slowpath+0x1ff/0x2a0 [ 0.000000] RSP: 0000:ffffffffb4a03df0 EFLAGS: 00010082 ORIG_RAX: 0000000000000000 [ 0.000000] RAX: 0000000000000033 RBX: 0000000000000000 RCX: ffffffffb4a797c0 [ 0.000000] RDX: ffffffffb36b41de RSI: 0000000000000001 RDI: 0000000000000046 [ 0.000000] RBP: ffffffffb4a03e30 R08: 0000000000000001 R09: 0000000000000000 [ 0.000000] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffb4c789e0 [ 0.000000] R13: ffffffffb4a03df8 R14: ffffffffb48dcfb0 R15: 0000000000000000 [ 0.000000] FS: 0000000000000000(0000) GS:ffffffffb4a8e000(0000) knlGS:0000000000000000 [ 0.000000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.000000] CR2: ffffa2951a312000 CR3: 0000000018a74000 CR4: 00000000000606b0 [ 0.000000] Call Trace: [ 0.000000] mutex_unlock+0x12/0x20 [ 0.000000] __clocksource_register_scale+0xda/0x120 [ 0.000000] kvmclock_init+0x22d/0x23f [ 0.000000] setup_arch+0xa20/0xaf6 [ 0.000000] start_kernel+0x6a/0x4dc [ 0.000000] ? copy_bootdata+0x1f/0xb8 [ 0.000000] x86_64_start_reservations+0x24/0x26 [ 0.000000] x86_64_start_kernel+0x73/0x76 [ 0.000000] secondary_startup_64+0xa5/0xb0 [ 0.000000] Code: 0f 0b e9 ae fe ff ff e8 d0 15 a5 ff 85 c0 74 1d 44 8b 15 1d 0c 8f 01 45 85 d2 75 11 4c 89 f6 48 c7 c7 53 b4 8c b4 e8 81 3a 5c ff <0f> 0b 44 8b 0d c0 b2 7c 01 45 85 c9 0f 84 6f fe ff ff e9 73 fe [ 0.000000] random: get_random_bytes called from print_oops_end_marker+0x3f/0x60 with crng_init=0 [ 0.000000] ---[ end trace a9c261981ad74140 ]--- To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k job-script # job-script is attached in this email Thanks, Xiaolong