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 0A56E284B3B for ; Tue, 17 Feb 2026 20:55:36 +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=1771361738; cv=none; b=nExYkqRHqVOnSn3dwibiEwswLm9oFDg6dsfZEt9qnJ0faym70yLNtyUcJRwDpsHklojF83fUfK7Psp4R1x8d1C44EKuk24HZfVM9JhqGKg5WaCM6RvL63dI+ubPmJOb+cwkziJnmvxRR/U2vlp8ZHjpZF92ay/F6B1e4XAggVFU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771361738; c=relaxed/simple; bh=I2bq8O0Am4NgLaWqcg8bKuOyWoKEexJmylufUFpU8LI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=MZhcZwhtAWGoW8u/HqAmbPl/RU2B+5VFrSDpbc+Mdo9gMRZTr9ygSzt0cc6hku7FZosfKIAnr32/4eoLRTDx+rf+ZyrLwy0HSFTyZto/XTwNhB3gmWElhVa8HXvs/58HWUX7IwYQJiguH89GwYepMCsZWIgOru9XZkirBlFMmak= 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 006d021491bc7-6781479fe9dso3660652eaf.1 for ; Tue, 17 Feb 2026 12:55:36 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771361736; x=1771966536; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Bb6qhyFXxTx03Z7ggdi9EDskkcx19mjBlIu8eZ/eEIY=; b=kE88YUM2ypVc39PzWgBfGOpFWlBWDIRLutAfFyOmvFnMooqg6lgKKQ/o1Yr2+lXtnT Rn6VN+mR0uA121yMbT24XhrWuH74nKAkTn3HD8Yc2xiKnXYo2rGdHSSMydiYOb1uEFAG m0l+JDL7wPwWcj5XjG0MrkMA3mksJ74aFNlex6rnqS3wQo46691LzSaoV27i78v6xEF1 FolK+un1AZ7FShIvP9bli6xdImJsHWx0qh5ClGNlX19CazyIM2r/8vbQL68jI69YBNN/ c5d6EFSP+4IAcOqN4tw5i78jK2+32jWPe8EEQYC9VMTZ9JD7OELdsxMoxyexp1URrD7t 2WtA== X-Forwarded-Encrypted: i=1; AJvYcCWmckWEQKa/l/M/C8pX2nw62wMnFJfMVH2Hm7eaFEhj0Vv/+S+fFkFPbClhwMDWiJQwiP0S7pbeK7C8krA=@vger.kernel.org X-Gm-Message-State: AOJu0Yy6KUTsr/43m+l2BL5Gkodowq6ykxcM5Iv/PrcRVNZ/vMz+cwff 8pptIO8D2PW4UFcxCEDLm0IboYALbO/RRzU9KbGDObGBhnCx3yqY3SZk/mGUII4L0SgNyaNuVr5 S1KrMlXDiYQ1EQcE/rJoqWKB9O3UiO3crQw5kKVUONUVLN7otg68wGgmUwLY= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:3090:b0:662:fefa:9ee5 with SMTP id 006d021491bc7-678221cdb37mr6222935eaf.27.1771361735998; Tue, 17 Feb 2026 12:55:35 -0800 (PST) Date: Tue, 17 Feb 2026 12:55:35 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6994d5c7.a70a0220.2c38d7.010b.GAE@google.com> Subject: [syzbot] [ide?] UBSAN: shift-out-of-bounds in ata_qc_issue From: syzbot To: cassel@kernel.org, dlemoal@kernel.org, linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: ca4ee40bf13d Partly revert "drm/hyperv: Remove reference t.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13c6c722580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a771bfd268751cd6 dashboard link: https://syzkaller.appspot.com/bug?extid=1f77b8ca15336fff21ff compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ca4ee40b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c714adf37ddd/vmlinux-ca4ee40b.xz kernel image: https://storage.googleapis.com/syzbot-assets/4d56cd9f6175/bzImage-ca4ee40b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1f77b8ca15336fff21ff@syzkaller.appspotmail.com ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in drivers/ata/libata-core.c:5166:24 shift exponent 4210818301 is too large for 64-bit type 'long long unsigned int' CPU: 2 UID: 0 PID: 1282 Comm: kworker/2:1H Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events_highpri ata_scsi_deferred_qc_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233 __ubsan_handle_shift_out_of_bounds+0x279/0x2a0 lib/ubsan.c:494 ata_qc_issue.cold+0x38/0x9f drivers/ata/libata-core.c:5166 ata_scsi_deferred_qc_work+0x154/0x1f0 drivers/ata/libata-scsi.c:1679 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275 process_scheduled_works kernel/workqueue.c:3358 [inline] worker_thread+0x5da/0xe40 kernel/workqueue.c:3439 kthread+0x370/0x450 kernel/kthread.c:467 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---[ end trace ]--- Kernel panic - not syncing: UBSAN: panic_on_warn set ... CPU: 2 UID: 0 PID: 1282 Comm: kworker/2:1H Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events_highpri ata_scsi_deferred_qc_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 vpanic+0x552/0x970 kernel/panic.c:650 panic+0xd1/0xe0 kernel/panic.c:787 check_panic_on_warn kernel/panic.c:524 [inline] check_panic_on_warn.cold+0x19/0x34 kernel/panic.c:519 __ubsan_handle_shift_out_of_bounds+0x279/0x2a0 lib/ubsan.c:494 ata_qc_issue.cold+0x38/0x9f drivers/ata/libata-core.c:5166 ata_scsi_deferred_qc_work+0x154/0x1f0 drivers/ata/libata-scsi.c:1679 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275 process_scheduled_works kernel/workqueue.c:3358 [inline] worker_thread+0x5da/0xe40 kernel/workqueue.c:3439 kthread+0x370/0x450 kernel/kthread.c:467 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Kernel Offset: disabled Rebooting in 86400 seconds.. --- 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