Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 1 Oct 2002 11:58:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 1 Oct 2002 11:58:20 -0400 Received: from mailgw.cvut.cz ([147.32.3.235]:22498 "EHLO mailgw.cvut.cz") by vger.kernel.org with ESMTP id ; Tue, 1 Oct 2002 11:57:30 -0400 From: "Petr Vandrovec" Organization: CC CTU Prague To: Hugh Dickins Date: Tue, 1 Oct 2002 18:02:27 +0200 MIME-Version: 1.0 Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Subject: Re: [PATCH] Re: Shared memory shmat/dt not working well in Cc: Andrew Morton , X-mailer: Pegasus Mail v3.50 Message-ID: <35FD2132190@vcnet.vc.cvut.cz> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3752 Lines: 64 On 1 Oct 02 at 14:09, Hugh Dickins wrote: > Exemplary bug report! Many thanks for taking so much trouble to > reproduce the problem. Patch below (against 2.5.39) should fix it: > I'll send Linus and Andrew when I can get hold of a 2.5.40 tree. You are my hero! It fixed dnetc client failing with SIGSEGV after call to sys_mprotect(). Unfortunately it did not fixed another problem I have with sys_mprotect. If I start X, system stops to do anything useful. After SAK I could do remote connect and running 'w' and 'ps axf' moved them to 'D' state. Clean sysrq-u,s,b was possible. 2.5.40 kernel plus Hugh's patch, 100% reproducible with 2.5.40 SMP (non-preempt) kernel running on UP here... Thanks, Petr Vandrovec Oct 1 17:47:35 vana kernel: SysRq : SAK Oct 1 17:47:35 vana kernel: SAK: killed process 1482 (XFree86): fd#3 opened to the tty ... Oct 1 17:47:55 vana kernel: XFree86 D DADE7A60 0 1482 1481 (NOTLB) Oct 1 17:47:55 vana kernel: Call Trace: Oct 1 17:47:55 vana kernel: []schedule+0x3bb/0x488 Oct 1 17:47:55 vana kernel: []rwsem_down_read_failed+0x165/0x188 Oct 1 17:47:55 vana kernel: [].text.lock.fault+0x7/0x6c Oct 1 17:47:55 vana kernel: []do_page_fault+0x0/0x424 Oct 1 17:47:55 vana kernel: []do_generic_file_read+0xee/0x35c Oct 1 17:47:55 vana kernel: []do_generic_file_read+0x34e/0x35c Oct 1 17:47:55 vana kernel: []__generic_file_aio_read+0x187/0x1a0 Oct 1 17:47:55 vana kernel: []file_read_actor+0x0/0x134 Oct 1 17:47:55 vana kernel: []free_block+0x168/0x250 Oct 1 17:47:55 vana kernel: []error_code+0x2d/0x38 Oct 1 17:47:55 vana kernel: []flush_tlb_mm+0x1b/0x70 Oct 1 17:47:55 vana kernel: []change_protection+0x1a1/0x1dc Oct 1 17:47:55 vana kernel: []mprotect_fixup+0x16d/0x188 Oct 1 17:47:55 vana kernel: []sys_mprotect+0x18a/0x2c4 Oct 1 17:47:55 vana kernel: []syscall_call+0x7/0xb ... Oct 1 17:47:55 vana kernel: w D DADE7A60 0 1563 1558 (NOTLB) Oct 1 17:47:55 vana kernel: Call Trace: Oct 1 17:47:55 vana kernel: []dput+0x19/0x1d4 Oct 1 17:47:55 vana kernel: []rwsem_down_read_failed+0x165/0x188 Oct 1 17:47:55 vana kernel: [].text.lock.array+0x6d/0x10e Oct 1 17:47:55 vana kernel: []__get_free_pages+0x28/0x60 Oct 1 17:47:55 vana kernel: []proc_info_read+0x4f/0x108 Oct 1 17:47:55 vana kernel: []vfs_read+0xb4/0x134 Oct 1 17:47:55 vana kernel: []sys_read+0x2a/0x3c Oct 1 17:47:55 vana kernel: []syscall_call+0x7/0xb ... Oct 1 17:47:55 vana kernel: ps D DADE7A60 0 1583 1582 (NOTLB) Oct 1 17:47:55 vana kernel: Call Trace: Oct 1 17:47:55 vana kernel: []dput+0x19/0x1d4 Oct 1 17:47:55 vana kernel: []rwsem_down_read_failed+0x165/0x188 Oct 1 17:47:55 vana kernel: [].text.lock.array+0x6d/0x10e Oct 1 17:47:55 vana kernel: []__get_free_pages+0x28/0x60 Oct 1 17:47:55 vana kernel: []proc_info_read+0x4f/0x108 Oct 1 17:47:55 vana kernel: []vfs_read+0xb4/0x134 Oct 1 17:47:55 vana kernel: []sys_read+0x2a/0x3c Oct 1 17:47:55 vana kernel: []syscall_call+0x7/0xb - 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/