From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f71.google.com (mail-oo1-f71.google.com [209.85.161.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A36E730AAB3 for ; Fri, 20 Feb 2026 08:56:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771577792; cv=none; b=Am9rJMJ2XZXOG43rk4/xPsbyZfczMXYW71Obm9dhjPkwCOaR0hBano3d13PClMtEE2p+6c/5e8qgRIXgJ12sMYroeqokQOwrjaoAk6NZh7c9fzLoQAEnRTL3IhlieXTKD1DtOWTdPmOgSteGqo1MUNy7emRNStRYi9dQhhOD47c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771577792; c=relaxed/simple; bh=Gglsr0OYSSb+U7NStDl4aOvc4O+Zqr17TIxvEFpw/30=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=QimzLQpOgHJBB5RBNbGnsEX4LJ0GEW4Kvjx2Y+X+Jf9Wcim6FBZztL2GJ6dK1V/qpDo7tdOeEBmiQmbNdgiUypWKMTe1/MIdfJIDhL7KXsf8fxcAt+uOdqY/VDRxzOz4RH5kuF5h4DbOBNaD3mLiRrep0ohb+YzF0vauYcxSh7A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.161.71 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo1-f71.google.com with SMTP id 006d021491bc7-679ae8ba9d8so28695436eaf.2 for ; Fri, 20 Feb 2026 00:56:30 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771577789; x=1772182589; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=o0zLoyPQjTX9AcqywCRPPx2+R47Pn8isO0mP4K/p9jA=; b=SaFPYNnZxoGGCGt6ycLrJtpAZMTdEjNB5h7f7EdcH+OEjQR60oju6vkz7vZwb6P6dx vvCR8Rf1OYsFLzNEpx6uH9uGjDS0o8RaHU/y8JVqHFCiKn6uyejg+gTF2qhk0zfX3ONk 2t6VgdwDP/ymvbT0XUgKnL7dPdcdys/6/RH6jc11AUrgeJrIW163zTGo0l4hUC/9tsa1 DcdVcmRRfT41h1TMUT1ggXox00ZX2owKr4OL1WTbb6SAVCtfUFBuU/4mVJX343oAdqMZ D7bBKgNExvEwCmotWjMOvsvRqFLG0OxlAxUAYa33shj779t7XOF7uMzqdGMrOblk6AAl nzLA== X-Gm-Message-State: AOJu0YzTefSPMsXMX9PrqNyQwNXWtXMWhnjwooI2NX7r3brih3v9WVOC kRaRFmObys0hCfoQKXDjxQZ+2c0Mf0UMxJ3N0YOdxu3Joq7fKDhDZXyYMwCmT4dmgy8jChWIrOt wyqqzqGeJ8gkXVRbuq54JqVm+TpFF7dUu70EJLaO4RxevVxcemoC/2iwWrFQ= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:220b:b0:678:a4f1:c369 with SMTP id 006d021491bc7-679aeed1436mr3132636eaf.24.1771577789410; Fri, 20 Feb 2026 00:56:29 -0800 (PST) Date: Fri, 20 Feb 2026 00:56:29 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <699821bd.050a0220.21cd75.01ba.GAE@google.com> Subject: [syzbot] [kernel?] general protection fault in detach_timer (2) From: syzbot To: linux-kernel@vger.kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 8bf22c33e7a1 Merge tag 'net-7.0-rc1' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1483b6aa580000 kernel config: https://syzkaller.appspot.com/x/.config?x=abe4fa590468dbfb dashboard link: https://syzkaller.appspot.com/bug?extid=1a48e52497e1769b08de compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/28e2c9318a17/disk-8bf22c33.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1d96d4ab04ff/vmlinux-8bf22c33.xz kernel image: https://storage.googleapis.com/syzbot-assets/1c4db52b5202/bzImage-8bf22c33.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1a48e52497e1769b08de@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xfbd59c0000000025: 0000 [#1] SMP KASAN PTI KASAN: maybe wild-memory-access in range [0xdead000000000128-0xdead00000000012f] CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__hlist_del include/linux/list.h:994 [inline] RIP: 0010:detach_timer+0x120/0x300 kernel/time/timer.c:891 Code: c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 79 c1 79 00 4d 89 3c 24 4d 85 ff 74 46 e8 bb b3 13 00 49 83 c7 08 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 52 c1 79 00 4d 89 27 80 7c 24 04 00 RSP: 0018:ffffc90000157af8 EFLAGS: 00010802 RAX: 1bd5a00000000025 RBX: 1ffff1100bd1b3e7 RCX: ffff88801caa8000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000100 R10: dffffc0000000000 R11: fffffbfff1ed4477 R12: ffffc90000157c00 R13: ffff88805e8d9f40 R14: 1ffff1100bd1b3e8 R15: dead00000000012a FS: 0000000000000000(0000) GS:ffff888126342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007eff3f4a9d40 CR3: 0000000035532000 CR4: 00000000003526f0 Call Trace: expire_timers kernel/time/timer.c:1782 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x624/0x9f0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x1de/0x6f0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] run_ktimerd+0x69/0x100 kernel/softirq.c:1138 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__hlist_del include/linux/list.h:994 [inline] RIP: 0010:detach_timer+0x120/0x300 kernel/time/timer.c:891 Code: c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 79 c1 79 00 4d 89 3c 24 4d 85 ff 74 46 e8 bb b3 13 00 49 83 c7 08 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 52 c1 79 00 4d 89 27 80 7c 24 04 00 RSP: 0018:ffffc90000157af8 EFLAGS: 00010802 RAX: 1bd5a00000000025 RBX: 1ffff1100bd1b3e7 RCX: ffff88801caa8000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000100 R10: dffffc0000000000 R11: fffffbfff1ed4477 R12: ffffc90000157c00 R13: ffff88805e8d9f40 R14: 1ffff1100bd1b3e8 R15: dead00000000012a FS: 0000000000000000(0000) GS:ffff888126342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007eff3f4a9d40 CR3: 0000000035532000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: c1 e8 03 shr $0x3,%eax 3: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 7: 74 08 je 0x11 9: 4c 89 e7 mov %r12,%rdi c: e8 79 c1 79 00 call 0x79c18a 11: 4d 89 3c 24 mov %r15,(%r12) 15: 4d 85 ff test %r15,%r15 18: 74 46 je 0x60 1a: e8 bb b3 13 00 call 0x13b3da 1f: 49 83 c7 08 add $0x8,%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 52 c1 79 00 call 0x79c18a 38: 4d 89 27 mov %r12,(%r15) 3b: 80 7c 24 04 00 cmpb $0x0,0x4(%rsp) --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup