From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f80.google.com (mail-ot1-f80.google.com [209.85.210.80]) (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 11C2A40DFD7 for ; Sun, 19 Apr 2026 15:01:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776610889; cv=none; b=cAyOHHdX43Su0eMtjwlybjIi0G6Yy3+NtVtFNNlGUGG1ZjQ8LwCz9JLFUxBD89HrLQAV5+w9GJfePuskOGVMMK2Uuwljf1roUQ5NZQ1HqORlOjOdIsSKWjrPhx4rLKSlZPrHJPgeHHQnxW/MKqq8sdZwSEWhHATzHjsYTOtWLqo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776610889; c=relaxed/simple; bh=0U+J8vfr0vDbL8DVVtQMql6MLm4LdHFGsfFP+XQM+vk=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=eVLLGPGY1WuaAehoFAwlenWfzk5rGqppb1IWVSppmiCgdoum70tH7+DKUaH0QqNaiurqknkFWO3z2B9WduzIfIQmUevBRehLhT4dOYXV7zvX61L+IMD+njprfUYCA6bbmXR4P9G/ZzIlNaURlSGXNaEaQhHsCG69CSWVvZVVyVc= 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=209.85.210.80 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-f80.google.com with SMTP id 46e09a7af769-7dbd4fe0e15so5030806a34.3 for ; Sun, 19 Apr 2026 08:01:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776610887; x=1777215687; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=3ScVh6N/jlCXaeCgYPIBrM8KRbN+ToVY/6mYY+MS5Zs=; b=mSwa11JfOvNRMFDpWN4r47zbb4KJpdT+o3lRkUKO8MSYKTYnw0K7YaRnK3oyglOYQZ 232Qgv+Wry0z8mdw0NYrdmbGiUB3lnwG++TSIM/9d6BYwD5mYTrOuiA4qZKOY2FBNxD5 6EAvv4ANTrj10vGVt7FGzZ/6pLrGN4jJ+FTxelR3b3wjX/6wYK2p8joZ/dxMuGVccZH4 HKL65vMQkwLOhkC6JeS9tPvqU1tfTJ2tClLpLhp2JRRO7wZ4ctus6yzSS5MLjinvqg64 1DysEq47z6eFUZy5sdW9zK37aLcaCSeq1tohVRMItjv2wa0nDYrcbtNTvx8EUjEjtNdd qjkw== X-Gm-Message-State: AOJu0YzWXOPUxWYNx98DrLZSibLDlCa22wyoA00EUG73i05bkSvSnPWg 6MYwXAkqzlo79nFIH6ZPBrwho+TdiJ4DN3rlKNS8l2+87GbKCjRIKscC+5o+YkekUIYhMdg33ue BowC+w1kVi8gLntJlpCn2ompIvRb/QG7NFmNZ4I+obXWFNypUkPiIMYcvji6jGA== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6830:927:b0:7d7:fb8c:3c29 with SMTP id 46e09a7af769-7dc951d69ecmr6812710a34.14.1776610886987; Sun, 19 Apr 2026 08:01:26 -0700 (PDT) Date: Sun, 19 Apr 2026 08:01:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e4ee46.a00a0220.1bd0ca.0058.GAE@google.com> Subject: [syzbot] [kernel?] KMSAN: uninit-value in irqentry_exit_to_kernel_mode_preempt 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: faeab166167f Merge tag 'pinctrl-v7.1-1' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13728836580000 kernel config: https://syzkaller.appspot.com/x/.config?x=916f2f67e70d1263 dashboard link: https://syzkaller.appspot.com/bug?extid=23d7fcd204e3837866ff 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/fe08f489aa35/disk-faeab166.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aef0d8ac5a5a/vmlinux-faeab166.xz kernel image: https://storage.googleapis.com/syzbot-assets/35d09c9dfe78/bzImage-faeab166.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+23d7fcd204e3837866ff@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in irqentry_exit_to_kernel_mode_preempt+0xb0/0xc0 include/linux/irq-entry-common.h:472 irqentry_exit_to_kernel_mode_preempt+0xb0/0xc0 include/linux/irq-entry-common.h:472 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline] irqentry_exit+0x7b/0x760 kernel/entry/common.c:164 sysvec_apic_timer_interrupt+0x52/0x90 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697 write_comp_data kernel/kcov.c:270 [inline] __sanitizer_cov_trace_cmp4+0x86/0x90 kernel/kcov.c:288 do_csum lib/checksum.c:68 [inline] ip_fast_csum+0x24b/0x3f0 lib/checksum.c:99 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:842 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:876 [inline] nsim_dev_trap_report_work+0x8c0/0x1430 drivers/net/netdevsim/dev.c:922 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0xb65/0x1e40 kernel/workqueue.c:3385 worker_thread+0xee4/0x1590 kernel/workqueue.c:3466 kthread+0x53f/0x600 kernel/kthread.c:436 ret_from_fork+0x20f/0x8d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was created at: slab_post_alloc_hook mm/slub.c:4576 [inline] slab_alloc_node mm/slub.c:4898 [inline] __do_kmalloc_node mm/slub.c:5294 [inline] __kmalloc_node_track_caller_noprof+0x4f6/0x1750 mm/slub.c:5403 kmalloc_reserve net/core/skbuff.c:635 [inline] __alloc_skb+0x90d/0x1190 net/core/skbuff.c:713 alloc_skb include/linux/skbuff.h:1383 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:819 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:876 [inline] nsim_dev_trap_report_work+0x3f2/0x1430 drivers/net/netdevsim/dev.c:922 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0xb65/0x1e40 kernel/workqueue.c:3385 worker_thread+0xee4/0x1590 kernel/workqueue.c:3466 kthread+0x53f/0x600 kernel/kthread.c:436 ret_from_fork+0x20f/0x8d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 CPU: 0 UID: 0 PID: 55 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: events_unbound nsim_dev_trap_report_work ===================================================== --- 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