From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp153-168.sina.com.cn (smtp153-168.sina.com.cn [61.135.153.168]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9405923E325 for ; Sat, 16 May 2026 11:04:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=61.135.153.168 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778929492; cv=none; b=EBA2bAdycGqo721yjG3PXevzBkPEg+k7RR5Jwxtoy+F+1Dsb20Mh0fYg+RSa3eQBIyjS3eSSTis38+PYz71CKlqtuA6+WXmyFcKHHxqL6khUPHGqlt6vbRG98JC1SjYBEJuH29sIK0Y3cqw3D3z4+JFgfZpAJzUL4fl99FcrEDQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778929492; c=relaxed/simple; bh=mdhOxFeqfURUoHYFMao3qDOnOUlEuLhM1wydgDlkMP0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=r22AHiGher5lNXUEIzli73XzwtJZbQIIdjTxQyxyMZOtNUDrV3FdPlTtnNpcOqDohSBUew/FY4zAhPE5Y3Qkw5Ii1Mpjsb9UPqkXNV4nU7J+gjxkimccw7ieNFS2fTk+o5zP9BVZorQzGYojeBEkIJWbRd62NiX9pDM5OWuf0Hk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=cx78OsSQ; arc=none smtp.client-ip=61.135.153.168 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="cx78OsSQ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1778929485; bh=VU9KEyZwwJUlBZwYFQW4arTKQSj7rADqeoViYVI2vCs=; h=From:Subject:Date:Message-ID; b=cx78OsSQWVdnTcxaVK+YB8N6mnLb9/63yT6tQy2sGw91L8/VY2+0S7zH+lX3EQk1+ xOJWVfnNpqZXQZ0wN1thHlyP+DUliL96xtzBRHVAatWJxNVwoYcYWHx1TnjdBFeBR8 yHTML3FQdR41Vb682++HXrlJBug5gCzQdJgiK5fY= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.62.144]) by sina.com (10.54.253.33) with ESMTP id 6A084F410000558C; Sat, 16 May 2026 19:04:34 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 8340406685151 X-SMAIL-UIID: C2E3F54B6E6342EFBA5E854DCB6E6721-20260516-190434-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [kernel?] INFO: task hung in nsim_bus_dev_del Date: Sat, 16 May 2026 19:04:21 +0800 Message-ID: <20260516110423.721-1-hdanton@sina.com> In-Reply-To: <6a07b635.170a0220.df43.0000.GAE@google.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > Date: Fri, 15 May 2026 17:11:33 -0700 [thread overview] > Hello, > > syzbot found the following issue on: > > HEAD commit: 5cbb61bf4168 arm64/fpsimd: ptrace: zero target's fpsimd_st.. > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci > console output: https://syzkaller.appspot.com/x/log.txt?x=165db76c580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=a834c6344141a58b > dashboard link: https://syzkaller.appspot.com/bug?extid=1cf303af03cf30b1275a > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > userspace arch: arm64 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c4d56a580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=115db76c580000 #syz test --- x/kernel/workqueue.c +++ y/kernel/workqueue.c @@ -2384,6 +2384,10 @@ retry: work_flags |= WORK_STRUCT_INACTIVE; insert_work(pwq, work, &pwq->inactive_works, work_flags); } + do { + unsigned long data = *work_data_bits(work); + BUG_ON(data & WORK_OFFQ_DISABLE_MASK); + } while (0); out: raw_spin_unlock(&pool->lock); --