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h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=LUiGXn1pYD63w20Pe8Tx6H5DnUx12HAu4hb3BQmVJoKRLuB4O0/NG4by4iM/4xvdCkJ+2lt9fLo97nBzaGLEalYIS18YMRNmwPvHLw/wFbX3zbb+DqFcNb/CPEEAHUvgD8DGqnDWZdiDPfbyhXuCU8U7tlscZdhZzGqEMXl1Wac= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; arc=none smtp.client-ip=180.149.134.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([113.118.66.186]) by sina.com (10.185.250.21) with ESMTP id 665DA32A00000E68; Mon, 3 Jun 2024 19:04:12 +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: 2263583408501 X-SMAIL-UIID: D4937BB46EC843979FC1444F050976C8-20240603-190412-1 From: Hillf Danton To: syzbot Cc: frederic@kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Subject: Re: [syzbot] [kernel?] BUG: unable to handle kernel NULL pointer dereference in __hrtimer_run_queues Date: Mon, 3 Jun 2024 19:04:01 +0800 Message-Id: <20240603110401.1580-1-hdanton@sina.com> In-Reply-To: <000000000000deb5250619f9b5f4@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 On Mon, 03 Jun 2024 03:22:29 -0700 > Unable to handle kernel NULL pointer dereference at virtual address 0000000000000090 > CPU: 0 PID: 3192 Comm: syz-executor607 Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0 > Hardware name: linux,dummy-virt (DT) > pstate: 204000c9 (nzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) > pc : rb_next+0x1c/0x54 lib/rbtree.c:505 > lr : rb_erase_cached include/linux/rbtree.h:124 [inline] > lr : timerqueue_del+0x38/0x70 lib/timerqueue.c:57 > sp : ffff800080003e70 > x29: ffff800080003e70 x28: 0000000000000000 x27: fff000007f8cf780 > x26: 0000000000000001 x25: 00000000000000c0 x24: 0000001f0198bc90 > x23: fff000007f8cf780 x22: fff000007f8cf7e0 x21: fff000007f8cf780 > x20: fff000007f8cf7e0 x19: ffff800088c3bd60 x18: 0000000000000000 > x17: fff07ffffd319000 x16: ffff800080000000 x15: 0000ffffef309d38 > x14: 00000000000003bb x13: 0000000000000000 x12: ffff8000825e0028 > x11: 0000000000000001 x10: 0000000000000200 x9 : 0000000000200000 > x8 : 0008000000000000 x7 : ff7ffffffffffbff x6 : 00000000019a23f5 > x5 : fff07ffffd319000 x4 : 000000000a2dca90 x3 : ffff800088c3bd60 > x2 : ff7000007f8cf8e8 x1 : 0000000000000080 x0 : 0000000000000080 > Call trace: > rb_next+0x1c/0x54 lib/rbtree.c:505 > __remove_hrtimer kernel/time/hrtimer.c:1118 [inline] > __run_hrtimer kernel/time/hrtimer.c:1667 [inline] > __hrtimer_run_queues+0x104/0x1bc kernel/time/hrtimer.c:1751 > hrtimer_interrupt+0xe8/0x244 kernel/time/hrtimer.c:1813 After scratching head skin 30 minutes I failed to work out how the timer was armed.