Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752201Ab1DLMog (ORCPT ); Tue, 12 Apr 2011 08:44:36 -0400 Received: from mail-pz0-f46.google.com ([209.85.210.46]:39253 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751078Ab1DLMof convert rfc822-to-8bit (ORCPT ); Tue, 12 Apr 2011 08:44:35 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=oSibPUO2XyNLqFq1jdBfmZEajd8wxIDt4Rlkgt92wNk/7xqzF0ZkeGgV6+xz1HCB7p jvbwlg8IQdvC+i6V0hnRPtSunD63KtY0OpcASitXElutC3SPdC/SYwnsPaqD4rqa6656 qijt4nuuIe9sSr0uSbZu2ww5bTTIiS7RMN1f0= MIME-Version: 1.0 In-Reply-To: References: Date: Tue, 12 Apr 2011 20:44:35 +0800 Message-ID: Subject: Re: Processes hang in an unkillable state From: =?UTF-8?Q?Am=C3=A9rico_Wang?= To: =?UTF-8?B?Um9iZXJ0IMWad2nEmWNraQ==?= Cc: linux-kernel@vger.kernel.org, oleg@redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1106 Lines: 38 2011/4/12 Robert Święcki : > Hi, while fuzzing Linux system calls (32bit fuzzer, 64bi linux > kernel), it happens after some time (10-20mins) that some processes > enter a state which makes them un-killable. They are either in R or D > state. > > # strace ps wwuax > ... > ... > open("/proc/450/cmdline", O_RDONLY)     = 6 > read(6,  -             hangs.... > > # kill -9 450 > # kill -9 450 (no ESRCH) > > More data in the attachment - I'll keep it in the kdb session for > further examination. Hmm, it must be stuck at lib/rwsem.c /* wait to be given the lock */ for (;;) { if (!waiter.task) break; schedule(); set_task_state(tsk, TASK_UNINTERRUPTIBLE); } don't know why it still can't acquire the ->mmap_sem... Cc'ing Oleg... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/