Greeting, FYI, we noticed the following commit (built with gcc-9): commit: e7bf1ba97afdde75b0ef43e4bdb718bf843613f1 ("jump_label, x86: Emit short JMP") https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git objtool/core in testcase: kernel-selftests version: kernel-selftests-x86_64-7ae2585b-1_20210607 with following parameters: group: group-01 ucode: 0xe2 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: 4 threads Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz with 32G 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; [ 222.094341] BUG: unable to handle page fault for address: ffffffff83ccffe0 [ 222.101155] #PF: supervisor read access in kernel mode [ 222.106246] #PF: error_code(0x0000) - not-present page [ 222.111336] PGD 81b429067 P4D 81b429067 PUD 81b42a063 PMD 81d3ff063 PTE 800ffff7e3f30062 [ 222.119351] Oops: 0000 [#1] PREEMPT SMP PTI [ 222.123497] CPU: 2 PID: 5694 Comm: ftracetest Not tainted 5.13.0-rc1-00009-ge7bf1ba97afd #1 [ 222.131770] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT, BIOS 1.8.1 12/05/2017 [ 222.139095] RIP: 0010:insn_get_prefixes (kbuild/src/consumer/arch/x86/lib/insn.c:245) [ 222.144459] Code: cc cc cc cc cc 0f 1f 44 00 00 41 55 31 c0 41 54 55 53 48 8b 57 68 48 89 fb 48 8b 77 60 48 8d 4a 01 eb 1b 0f b6 b8 e5 f9 48 82 <40> 38 3c 02 75 17 48 83 c0 01 48 83 f8 05 0f 84 e8 01 00 00 48 8d All code ======== 0: cc int3 1: cc int3 2: cc int3 3: cc int3 4: cc int3 5: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) a: 41 55 push %r13 c: 31 c0 xor %eax,%eax e: 41 54 push %r12 10: 55 push %rbp 11: 53 push %rbx 12: 48 8b 57 68 mov 0x68(%rdi),%rdx 16: 48 89 fb mov %rdi,%rbx 19: 48 8b 77 60 mov 0x60(%rdi),%rsi 1d: 48 8d 4a 01 lea 0x1(%rdx),%rcx 21: eb 1b jmp 0x3e 23: 0f b6 b8 e5 f9 48 82 movzbl -0x7db7061b(%rax),%edi 2a:* 40 38 3c 02 cmp %dil,(%rdx,%rax,1) <-- trapping instruction 2e: 75 17 jne 0x47 30: 48 83 c0 01 add $0x1,%rax 34: 48 83 f8 05 cmp $0x5,%rax 38: 0f 84 e8 01 00 00 je 0x226 3e: 48 rex.W 3f: 8d .byte 0x8d Code starting with the faulting instruction =========================================== 0: 40 38 3c 02 cmp %dil,(%rdx,%rax,1) 4: 75 17 jne 0x1d 6: 48 83 c0 01 add $0x1,%rax a: 48 83 f8 05 cmp $0x5,%rax e: 0f 84 e8 01 00 00 je 0x1fc 14: 48 rex.W 15: 8d .byte 0x8d [ 222.163056] RSP: 0018:ffffc90002337ba8 EFLAGS: 00010202 [ 222.168230] RAX: 0000000000000000 RBX: ffffc90002337c50 RCX: ffffffff83ccffe1 [ 222.175299] RDX: ffffffff83ccffe0 RSI: ffffffff83ccffef RDI: 000000000000000f [ 222.182367] RBP: ffffffff83ccffe0 R08: ffffc90002337c50 R09: 0000000000000001 [ 222.189432] R10: 0000000000000003 R11: ffffffffc05af000 R12: ffffffffc05af000 [ 222.196519] R13: ffffffffc05af000 R14: ffff8888135f8228 R15: 0000000000000000 [ 222.203587] FS: 00007f9114dab740(0000) GS:ffff88881dd00000(0000) knlGS:0000000000000000 [ 222.211605] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 222.217308] CR2: ffffffff83ccffe0 CR3: 00000008124fe006 CR4: 00000000003706e0 [ 222.224385] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 222.231465] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 222.238556] Call Trace: [ 222.240982] ? mem_cgroup_swap_init (kbuild/src/consumer/arch/x86/include/asm/jump_label.h:25 kbuild/src/consumer/include/linux/memcontrol.h:613 kbuild/src/consumer/mm/memcontrol.c:7313) [ 222.245211] ? 0xffffffffc05af000 [ 222.248495] ? 0xffffffffc05af000 [ 222.251777] insn_get_opcode (kbuild/src/consumer/arch/x86/lib/insn.c:272) [ 222.255576] ? mem_cgroup_swap_init (kbuild/src/consumer/arch/x86/include/asm/jump_label.h:25 kbuild/src/consumer/include/linux/memcontrol.h:613 kbuild/src/consumer/mm/memcontrol.c:7313) [ 222.259807] insn_get_modrm (kbuild/src/consumer/arch/x86/lib/insn.c:343) [ 222.263522] ? mem_cgroup_swap_init (kbuild/src/consumer/arch/x86/include/asm/jump_label.h:25 kbuild/src/consumer/include/linux/memcontrol.h:613 kbuild/src/consumer/mm/memcontrol.c:7313) [ 222.267750] insn_get_sib (kbuild/src/consumer/arch/x86/lib/insn.c:421) [ 222.271209] insn_get_displacement (kbuild/src/consumer/arch/x86/lib/insn.c:464) [ 222.275527] insn_get_immediate (kbuild/src/consumer/arch/x86/lib/insn.c:632) [ 222.279585] insn_get_length (kbuild/src/consumer/arch/x86/lib/insn.c:707) [ 222.283298] insn_decode (kbuild/src/consumer/arch/x86/lib/insn.c:747) [ 222.286668] arch_jump_entry_size (kbuild/src/consumer/arch/x86/kernel/jump_label.c:27) [ 222.290815] ? mem_cgroup_swap_init (kbuild/src/consumer/arch/x86/include/asm/jump_label.h:25 kbuild/src/consumer/include/linux/memcontrol.h:613 kbuild/src/consumer/mm/memcontrol.c:7313) [ 222.295045] ? mem_cgroup_swap_init (kbuild/src/consumer/mm/memcontrol.c:7316) [ 222.299362] ? mem_cgroup_swap_init (kbuild/src/consumer/arch/x86/include/asm/jump_label.h:25 kbuild/src/consumer/include/linux/memcontrol.h:613 kbuild/src/consumer/mm/memcontrol.c:7313) [ 222.303592] jump_label_text_reserved (kbuild/src/consumer/kernel/jump_label.c:312 kbuild/src/consumer/kernel/jump_label.c:325 kbuild/src/consumer/kernel/jump_label.c:791) [ 222.308170] register_kprobe (kbuild/src/consumer/kernel/kprobes.c:2052) [ 222.312660] register_trace_kprobe (kbuild/src/consumer/kernel/trace/trace_kprobe.c:655) [ 222.317063] __trace_kprobe_create (kbuild/src/consumer/kernel/trace/trace_kprobe.c:889) [ 222.321468] ? register_trace_kprobe (kbuild/src/consumer/kernel/trace/trace_kprobe.c:715) [ 222.326055] ? probes_profile_seq_show (kbuild/src/consumer/kernel/trace/trace_kprobe.c:922) [ 222.330631] trace_probe_create (kbuild/src/consumer/kernel/trace/trace_probe.c:1148) [ 222.334603] create_or_delete_trace_kprobe (kbuild/src/consumer/kernel/trace/trace_kprobe.c:926) [ 222.339527] trace_parse_run_command (kbuild/src/consumer/kernel/trace/trace.c:9778) [ 222.344017] vfs_write (kbuild/src/consumer/fs/read_write.c:603) [ 222.347303] ksys_write (kbuild/src/consumer/fs/read_write.c:658) [ 222.350672] do_syscall_64 (kbuild/src/consumer/arch/x86/entry/common.c:47) [ 222.354213] entry_SYSCALL_64_after_hwframe (kbuild/src/consumer/arch/x86/entry/entry_64.S:112) [ 222.359217] RIP: 0033:0x7f9114e98504 [ 222.362758] Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b3 0f 1f 80 00 00 00 00 48 8d 05 f9 61 0d 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89 f5 53 All code ======== 0: 00 f7 add %dh,%bh 2: d8 64 89 02 fsubs 0x2(%rcx,%rcx,4) 6: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax d: eb b3 jmp 0xffffffffffffffc2 f: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 16: 48 8d 05 f9 61 0d 00 lea 0xd61f9(%rip),%rax # 0xd6216 1d: 8b 00 mov (%rax),%eax 1f: 85 c0 test %eax,%eax 21: 75 13 jne 0x36 23: b8 01 00 00 00 mov $0x1,%eax 28: 0f 05 syscall 2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 54 ja 0x86 32: c3 retq 33: 0f 1f 00 nopl (%rax) 36: 41 54 push %r12 38: 49 89 d4 mov %rdx,%r12 3b: 55 push %rbp 3c: 48 89 f5 mov %rsi,%rbp 3f: 53 push %rbx Code starting with the faulting instruction =========================================== 0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 6: 77 54 ja 0x5c 8: c3 retq 9: 0f 1f 00 nopl (%rax) c: 41 54 push %r12 e: 49 89 d4 mov %rdx,%r12 11: 55 push %rbp 12: 48 89 f5 mov %rsi,%rbp 15: 53 push %rbx 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