From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f208.google.com (mail-oi1-f208.google.com [209.85.167.208]) (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 DF9303563EB for ; Sun, 19 Jul 2026 09:28:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784453317; cv=none; b=cwqqJSDzJ5ZAhJ8DQAfKS8ji/qzA2iTPQbK4IgTtlnjkElSpx6YPywhFSFBJc71L6o4hzUG1XDvGe9S7q/ye1dvEN298CA/aaH10L9GgCgLy1+b5HnNxxJvAEkx6jNjFqACrvREM6XDxtWHUPzEXcV9CZ8Z7UDfA9xjLurVMbes= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784453317; c=relaxed/simple; bh=GhXE1AGfBNpVowTWyOnIyFrxukH66NzPvanM4Qnd+lQ=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=LQhLwhO40u96Fcr3e3rAVLqS/0j6BjK1rZpIRqDlLgnvGn500BocKil5qtvaV5sWKAGtWYNfVhqurV5GXWeS7r2czItysiyvm7azUs3zTYitycFtGKiH9FBFahAcfQgMbQEK+ntUTGS3o1V89pkeFBbo+mnjn8pFs4MbtuaObPY= 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=209.85.167.208 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-oi1-f208.google.com with SMTP id 5614622812f47-495b0cf250dso7347668b6e.3 for ; Sun, 19 Jul 2026 02:28:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1784453315; x=1785058115; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=GLjif+/T7Z8GvK+XYzDCPi/8rfGtHJMOwI0iClWQulI=; b=V6Wa8AL1Ary5DA37g0n1n7sYzDyxqBbDyKUbJuDWrpPBJs5y0Pl/lorZOAtqi50I8g C0NUQTMhTZDBXGxus6OEeboRQ3uSKaJOOOI2rxJN7APxBbp2+j9pRhAByhmgTsbCwjOz a4Q+THBxAC2apCIgMoHihzrokWxzRTWOVTFFO2odvKY+QLXE3fUR/LdUE6/qaNxafYwN wQaKxIRoWty/3YjXjDw1T2a7XDtI8o5MXJglSqYQJJGnPkBe9O72+ML8NLqXT4DS9sgJ Uy6AeH2eRU05jOjO2vJP719DDnIZxt9zfqxZaDwmE6YUJnDGqd/mc1ZP6IIUn3l/TrYH DDRA== X-Gm-Message-State: AOJu0YxPgOvFPBSi2oeelahcFyzpjEFINeS4RAvIhSd+FGp6QecTvy+I U0QLnEmG2HB1J2Q8ASM6EWDgqjuO9TU3+Q/WQqaHObqtXoEM2L0OYujCsFgvcOULgvqBpbnCrNL iYatC59ZEKpmZm/MXT4mBHfv7mYl/U9Le+6doJovTAdgg4nsxZcFfGbW3VqldzA== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1b20:b0:48a:bb5d:292b with SMTP id 5614622812f47-4a4d055efc2mr4892983b6e.32.1784453314836; Sun, 19 Jul 2026 02:28:34 -0700 (PDT) Date: Sun, 19 Jul 2026 02:28:34 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a5c98c2.5028b7d0.1f0bb.020f.GAE@google.com> Subject: [syzbot] [kernel?] KMSAN: kernel-infoleak in irqentry_exit (2) 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: 4a50a141f05a Merge tag 'bootconfig-fixes-v7.2-rc1' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14af5cb9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c2842025f4a17812 dashboard link: https://syzkaller.appspot.com/bug?extid=95096af594918ed6dcb8 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c4b66817b655/disk-4a50a141.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ce2987914219/vmlinux-4a50a141.xz kernel image: https://storage.googleapis.com/syzbot-assets/61031b19febb/bzImage-4a50a141.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+95096af594918ed6dcb8@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: kernel-infoleak in rseq_exit_user_update include/linux/rseq_entry.h:626 [inline] BUG: KMSAN: kernel-infoleak in __rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:674 [inline] BUG: KMSAN: kernel-infoleak in rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:703 [inline] BUG: KMSAN: kernel-infoleak in exit_to_user_mode_loop kernel/entry/common.c:103 [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+0x34f/0xa40 kernel/entry/common.c:165 rseq_exit_user_update include/linux/rseq_entry.h:626 [inline] __rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:674 [inline] rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:703 [inline] exit_to_user_mode_loop kernel/entry/common.c:103 [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+0x34f/0xa40 kernel/entry/common.c:165 exc_page_fault+0x7e/0xb0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:595 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 ffff88811ad73e8c Data copied to user address 00007efc1e97c15c CPU: 0 UID: 0 PID: 5396 Comm: sshd-session Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ===================================================== --- 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