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Mon, 19 Oct 2026 15:27:19 -0700 (PDT) Date: Mon, 19 Oct 2026 15:27:19 -0700 In-Reply-To: <6ad23c08.7952420f.283480.0348.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ad69947.8652420f.25107a.2841.GAE@google.com> Subject: Re: [syzbot] [edac?] WARNING: ODEBUG bug in mcheck_cpu_init From: syzbot To: bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, tglx@kernel.org, tony.luck@intel.com, x86@kernel.org Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: c03c1a14507d Linux 7.3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=112ccc95580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b38d39c45202f4fa dashboard link: https://syzkaller.appspot.com/bug?extid=553c9f2c5781192c2214 compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164119cd580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=132ccc95580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/99fcc4d8c943/disk-c03c1a14.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ba99fd445f9b/vmlinux-c03c1a14.xz kernel image: https://storage.googleapis.com/syzbot-assets/be10147815f2/bzImage-c03c1a14.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+553c9f2c5781192c2214@syzkaller.appspotmail.com ------------[ cut here ]------------ ODEBUG: init active (active state 0) object: ffff8880b85234a0 object type: timer_list hint: mce_timer_fn+0x0/0x280 include/linux/highmem-internal.h:-1 WARNING: lib/debugobjects.c:632 at debug_print_object+0xec/0x230 lib/debugobjects.c:629, CPU#1: swapper/1/0 Modules linked in: CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:debug_print_object+0x18a/0x230 lib/debugobjects.c:629 Code: f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 0d ac 58 fd 4d 8b 0f 4c 89 ef 48 8b 74 24 08 48 89 ea 44 89 e1 4d 89 f0 ff 34 24 <67> 48 0f b9 3a 48 83 c4 08 ff 05 e3 60 d7 0b 48 83 c4 10 5b 41 5c RSP: 0000:ffffc900001c7c20 EFLAGS: 00010046 RAX: 1ffffffff16df3c0 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffffffff8bcc7640 RSI: ffffffff8bcc7240 RDI: ffffffff90bcd1e0 RBP: ffffffff8bcc7640 R08: ffff8880b85234a0 R09: ffffffff8b6fb180 R10: dffffc0000000000 R11: ffffffff81b2b760 R12: 0000000000000000 R13: ffffffff90bcd1e0 R14: ffff8880b85234a0 R15: ffffffff8b6f9e00 FS: 0000000000000000(0000) GS:ffff888124ab9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000000efb0000 CR4: 00000000003506b0 Call Trace: __debug_object_init+0x224/0x350 lib/debugobjects.c:818 debug_timer_init kernel/time/timer.c:788 [inline] debug_init kernel/time/timer.c:836 [inline] timer_init_key+0x41/0x2c0 kernel/time/timer.c:880 __mcheck_cpu_setup_timer arch/x86/kernel/cpu/mce/core.c:2087 [inline] mcheck_cpu_init+0x3dc/0x600 arch/x86/kernel/cpu/mce/core.c:2262 identify_cpu+0x1f2c/0x3940 arch/x86/kernel/cpu/common.c:2126 identify_secondary_cpu+0xaa/0x160 arch/x86/kernel/cpu/common.c:2187 ap_starting+0x9c/0x150 arch/x86/kernel/smpboot.c:190 start_secondary+0x66/0x110 arch/x86/kernel/smpboot.c:280 common_startup_64+0x13e/0x157 ---------------- Code disassembly (best guess): 0: f8 clc 1: 48 c1 e8 03 shr $0x3,%rax 5: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 9: 74 08 je 0x13 b: 4c 89 ff mov %r15,%rdi e: e8 0d ac 58 fd call 0xfd58ac20 13: 4d 8b 0f mov (%r15),%r9 16: 4c 89 ef mov %r13,%rdi 19: 48 8b 74 24 08 mov 0x8(%rsp),%rsi 1e: 48 89 ea mov %rbp,%rdx 21: 44 89 e1 mov %r12d,%ecx 24: 4d 89 f0 mov %r14,%r8 27: ff 34 24 push (%rsp) * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 48 83 c4 08 add $0x8,%rsp 33: ff 05 e3 60 d7 0b incl 0xbd760e3(%rip) # 0xbd7611c 39: 48 83 c4 10 add $0x10,%rsp 3d: 5b pop %rbx 3e: 41 5c pop %r12 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.