From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f78.google.com (mail-ot1-f78.google.com [209.85.210.78]) (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 1C40916A956 for ; Sun, 31 May 2026 00:27:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780187255; cv=none; b=AvUhPJ93EadUoqoa0sPUV7+NUlLlBnFJTLjBQNZMhWzzdR2SS45jvhI7cUiRY8cSJUtTF2SpejT9Gf+i6603lRFIgQxV9s/uRfzemLUkuoM8uY/K7Ptqf5oHKnPH6PfNenBb3zQq6zITnYXk3tzceCJ3rxFtllT9HynNWfXyNK8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780187255; c=relaxed/simple; bh=11v1wkx9NK05ffzsX+KQHZWrmjCtumnkVCplQD68ffE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=j5ZL0vxDTEvRed/06/I6O2CqK7iiLw+Vo/mMclnhJ0eSVMrfI88NatCwV2RXmcuXlni+O2lDcmv63y4c6EaVudkWZaGK67z7hkCtroE9WyruH4lPIjPt6zRWzG/SzMzFEtRdJvuYKeM8M0qkr34RKlNj7qbCV633+RQPkrWGIXw= 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=209.85.210.78 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-ot1-f78.google.com with SMTP id 46e09a7af769-7e64c83e5c1so5884425a34.2 for ; Sat, 30 May 2026 17:27:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780187253; x=1780792053; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=hnQfk5Qt5RlynuCB5SAp2+04QuF6pLkIeYkvRfaaoH4=; b=LUub+S3zRplFCjG8DnXk2Lu6nDuySSOmlXzDfgyR03s/LnwMKVHGDdj2S/6yyZjc/e DJxdNRussZ5/zvGOGc8SaUazCthFC+pB/0FpeFNS5V6AF7p9OLYQIpdVtp1iLKNDF7jU s6mY/sv8vs64rZN4m4lEqYeqZuD22eY5sFQcQZ6ZcwglsBXiOS+tfSBIc0wMzfQspEl3 +sufaU5AgX7VUczmlRM04iHs0h36tWI+vRbxdwUrc0zVyq8tFPE86edbVcHQiaxKm19Q 1pAuDfkga6sXiTTjZYExlLjfQ2ulTTsrIWOUg8L+qV7oht8jJtZLpVPSZkrZx7tJZcCM chew== X-Gm-Message-State: AOJu0YzSoM3FOy7uz6iDFWjmvX9GLpoYz5xTYdHDyH1wmu1H8ag4p2gi zGRoMJ6wWTN41X6pzWiHNR7/fnOGx7BVN/X+Woo4FKrC/zIb3rlv9NGfPLYLqIQBBhkfkLXtsTL DjOZvgUGS1wVyFW6CDOFBXxm5QRA6VO+uJ6VYslR0OcPk9MDldgueYqIOoMcBDw== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4ccb:b0:69d:8f47:f66e with SMTP id 006d021491bc7-69e10382514mr2470159eaf.35.1780187253056; Sat, 30 May 2026 17:27:33 -0700 (PDT) Date: Sat, 30 May 2026 17:27:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a1b8075.c16d89a8.217f2c.000c.GAE@google.com> Subject: [syzbot] [kernel?] KMSAN: kernel-infoleak in irqentry_exit From: syzbot To: linux-kernel@vger.kernel.org, luto@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: 670b77dfebe7 Merge tag 'usb-7.1-rc6' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10ca512e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a0ca3b8cb3875012 dashboard link: https://syzkaller.appspot.com/bug?extid=185a631927096f9da2fc 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/30de8a17219b/disk-670b77df.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8ee3b0ab7b4b/vmlinux-670b77df.xz kernel image: https://storage.googleapis.com/syzbot-assets/ccbac9177b62/bzImage-670b77df.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+185a631927096f9da2fc@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: kernel-infoleak in rseq_set_ids_get_csaddr include/linux/rseq_entry.h:502 [inline] BUG: KMSAN: kernel-infoleak in rseq_update_usr include/linux/rseq_entry.h:536 [inline] BUG: KMSAN: kernel-infoleak in rseq_exit_user_update include/linux/rseq_entry.h:644 [inline] BUG: KMSAN: kernel-infoleak in __rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:673 [inline] BUG: KMSAN: kernel-infoleak in rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:702 [inline] BUG: KMSAN: kernel-infoleak in exit_to_user_mode_loop kernel/entry/common.c:100 [inline] BUG: KMSAN: kernel-infoleak in __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] BUG: KMSAN: kernel-infoleak in irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline] BUG: KMSAN: kernel-infoleak in irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline] BUG: KMSAN: kernel-infoleak in irqentry_exit+0x48b/0xa00 kernel/entry/common.c:162 rseq_set_ids_get_csaddr include/linux/rseq_entry.h:502 [inline] rseq_update_usr include/linux/rseq_entry.h:536 [inline] rseq_exit_user_update include/linux/rseq_entry.h:644 [inline] __rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:673 [inline] rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:702 [inline] exit_to_user_mode_loop kernel/entry/common.c:100 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline] irqentry_exit+0x48b/0xa00 kernel/entry/common.c:162 exc_page_fault+0x7e/0xb0 arch/x86/mm/fault.c:1530 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:618 Local variable end_time.i.i created at: __do_sys_poll fs/select.c:1063 [inline] __se_sys_poll fs/select.c:1060 [inline] __x64_sys_poll+0x87/0x540 fs/select.c:1060 x64_sys_call+0x3130/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:8 Bytes 0-3 of 4 are uninitialized Memory access of size 4 starts at ffff888119e3be88 Data copied to user address 00007fcc60203140 CPU: 1 UID: 0 PID: 5562 Comm: sshd-session Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 ===================================================== --- 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