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X-MS-Exchange-CrossTenant-Network-Message-Id: 1d504e54-cafe-4719-086a-08defebf38e0 X-MS-Exchange-CrossTenant-AuthSource: LOAP265MB8560.GBRP265.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Aug 2026 13:30:38.1590 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: bbc898ad-b10f-4e10-8552-d9377b823d45 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: pmG1+KzeFiXwmyQpNM4igX0V808EUxbdcLadHmbJ9dttO9cv57wlGGZDe/D0EBKPNv8FhlvkU4bOpgl3bH7KEw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CW1P265MB7785 (Cc Clang/LLVM folks) On Thu Aug 20, 2026 at 4:16 AM BST, kernel test robot wrote: > > > Hello, > > kernel test robot noticed "CFI_failure_at_do_one_initcall" on: > > commit: b7b8b4ccdad45a59aafa5cfc32a51fe1ee5cb680 ("rust: extract `bitfiel= d!` macro from `register!`") https://git.kernel.org/cgit/linux/kernel/git/t= orvalds/linux.git master > > [test still failed on linus/master 8d3ae59288f1e7d58d76558a6ee96d533bc501= 9] > > in testcase: rcutorture > with following parameters: > > runtime: 300s > test: cpuhotplug > torture_type: tasks-tracing > > > > config: x86_64-randconfig-015-20260715 > compiler: clang-22 > test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 3= 2G > > (please refer to attached dmesg/kmsg for entire log/backtrace) > > If you fix the issue in a separate patch/commit (i.e. not just a new vers= ion of the same patch/commit), kindly add following tags > | Reported-by: kernel test robot > | Closes: https://lore.kernel.org/oe-lkp/202608201017.100a4511-lkp@intel.= com The issue looks like that LLVM is trying to merge functions by creating ali= as with different KCFI types. See this minimized example: https://godbolt.org/z/PhhcGh4W5 Note that a and b have different !kcfi_types annotation, but they're merged regardless. This causes the merge of `__module_firmware_test_init` with `Flags::zeroed` which ABI-wise are compatible as they all return just an integer, but have different KCFI signature. I think we need to disable function merging pass when KCFI is enabled, unti= l this has been fixed by LLVM. Clang disables this pass by default. We can al= so workaround the issue by disable the test that generates `__module_firmware_test_init` (perhaps we should do this regardless, it's strange that a module is produced from doc tests!) So that commit is just a trigger and isn't buggy itself; it only introduces= a new function which happens to be mergeable with the empty __module_firmware_test_init. Best, Gary > > > [ 16.811904][ T1] CFI failure at do_one_initcall+0x12e/0x478 (target= : _RINvCsdamrQDJyPhn_8pin_init6zeroedNtNvNvNvCsdPKRummocL6_25doctests_kerne= l_generated33rust_doctest_kernel_bitfield_rs_04main43__doctest_main_rust_ke= rnel_bitfield_rs_118_05FlagsEBE_+0x0/0x4; expected type: 0x6fbb3035) > [ 16.820524][ T1] WARNING: at do_one_initcall+0x12e/0x478, CPU#0: sw= apper/0/1 > [ 16.823875][ T1] Modules linked in: > [ 16.825674][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 7= .1.0-rc4-00055-gb7b8b4ccdad4 #1 PREEMPT 79da7d58e576708b28b47c0dd4cca3fe34= a229fd > [ 16.831720][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 19= 96), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > [ 16.836267][ T1] RIP: 0010:do_one_initcall+0x12e/0x478 > [ 16.838287][ T1] Code: d2 31 c9 e8 74 04 49 00 45 84 f6 75 0c 48 8d= 3d 90 03 a1 0c 67 48 0f b9 3a 4c 8b 5c 24 08 41 ba cb cf 44 90 45 03 53 fc= 74 02 <0f> 0b 2e e8 42 96 f8 06 41 89 c6 0f 1f 44 00 00 41 81 e5 ff ff ff > [ 16.843506][ T1] RSP: 0018:ffffc9000001fb80 EFLAGS: 00010a13 > [ 16.845121][ T1] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0= 000000000000000 > [ 16.847279][ T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0= 000000000000000 > [ 16.849427][ T1] RBP: ffffc9000001fe70 R08: 0000000000000000 R09: 0= 000000b8a3be5a2 > [ 16.851619][ T1] R10: 000000006c292bb6 R11: ffffffff81407458 R12: f= fffffff8f899850 > [ 16.853771][ T1] R13: 0000000080000000 R14: 0000000000000001 R15: 1= ffffffff1edab41 > [ 16.855915][ T1] FS: 0000000000000000(0000) GS:0000000000000000(00= 00) knlGS:0000000000000000 > [ 16.858307][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 16.860091][ T1] CR2: 00007fd1104620ac CR3: 000000000ba86000 CR4: 0= 0000000000406b0 > [ 16.862236][ T1] Call Trace: > [ 16.863144][ T1] > [ 16.863961][ T1] ? __cfi__RINvCsdamrQDJyPhn_8pin_init6zeroedNtNvNv= NvCsdPKRummocL6_25doctests_kernel_generated33rust_doctest_kernel_bitfield_r= s_04main43__doctest_main_rust_kernel_bitfield_rs_118_05FlagsEBE_+0x8/0x8 > [ 16.869044][ T1] ? stack_depot_save_flags+0x40f/0xab8 > [ 16.870574][ T1] ? irqentry_exit+0x1b8/0x638 > [ 16.871878][ T1] ? trace_irq_disable+0x25/0x100 > [ 16.873243][ T1] ? __cfi_ignore_unknown_bootoption+0x8/0x8 > [ 16.874861][ T1] ? strlen+0x32/0x78 > [ 16.875952][ T1] ? parameq+0x1a/0xf8 > [ 16.877070][ T1] ? __cfi_ignore_unknown_bootoption+0x8/0x8 > [ 16.878666][ T1] ? parse_args+0x17e/0x538 > [ 16.879902][ T1] do_initcall_level+0x10e/0x1c0 > [ 16.881314][ T1] do_initcalls+0x59/0xc0 > [ 16.882501][ T1] kernel_init_freeable+0x11e/0x1c0 > [ 16.883889][ T1] ? __cfi_kernel_init+0x8/0x8 > [ 16.885175][ T1] kernel_init+0x16/0x138 > [ 16.886357][ T1] ret_from_fork+0x266/0x5f8 > [ 16.887598][ T1] ? __cfi_kernel_init+0x8/0x8 > [ 16.888884][ T1] ret_from_fork_asm+0x11/0x20 > [ 16.890220][ T1] > [ 16.891058][ T1] irq event stamp: 306141 > [ 16.892233][ T1] hardirqs last enabled at (306157): [] __console_unlock+0x61/0xc0 > [ 16.894765][ T1] hardirqs last disabled at (306170): [] __console_unlock+0x46/0xc0 > [ 16.897303][ T1] softirqs last enabled at (305714): [] handle_softirqs+0x614/0x780 > [ 16.899859][ T1] softirqs last disabled at (305705): [] __irq_exit_rcu+0x45/0x140 > [ 16.902401][ T1] ---[ end trace 0000000000000000 ]--- > > > The kernel config and materials to reproduce are available at: > https://download.01.org/0day-ci/archive/20260820/202608201017.100a4511-lk= p@intel.com > > > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki