Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751814AbaKGLK4 (ORCPT ); Fri, 7 Nov 2014 06:10:56 -0500 Received: from mail-wg0-f42.google.com ([74.125.82.42]:40069 "EHLO mail-wg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751660AbaKGLKx (ORCPT ); Fri, 7 Nov 2014 06:10:53 -0500 Message-ID: <545CA8B6.2060608@message-id.googlemail.com> Date: Fri, 07 Nov 2014 12:10:46 +0100 From: Stefan Seyfried User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: LKML Subject: [REGRESSION] in 3.18-rc1: ppp crashes kernel 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 Hi all, since 3.18-rc1, setting up a PPP interface kills my kernel with [ 163.433251] PPP generic driver version 2.4.2 [ 164.452474] ------------[ cut here ]------------ [ 164.453327] kernel BUG at ../mm/vmalloc.c:1316! [ 164.453327] invalid opcode: 0000 [#1] PREEMPT SMP [ 164.453327] Modules linked in: ppp_async crc_ccitt ppp_generic slhc af_packet xfs libcrc32c coretemp kvm_intel snd_hda_codec_conexant iTCO_wdt snd_hda_codec_generic iTCO_vendor_support uvcvideo snd_hda_intel snd_hda_controller mac80211 videobuf2_vmalloc snd_hda_codec kvm e1000e videobuf2_memops cfg80211 videobuf2_core v4l2_common snd_hwdep i2c_i801 videodev snd_pcm pcspkr thinkpad_acpi serio_raw wmi lpc_ich snd_timer thermal snd rfkill mfd_core tpm_tis shpchp mei_me soundcore ptp mei pps_core acpi_cpufreq tpm battery processor ac dm_mod btrfs xor raid6_pq i915 i2c_algo_bit drm_kms_helper drm video button sg [ 164.453327] CPU: 0 PID: 6927 Comm: pppd Not tainted 3.18.0-rc3-3.ge706e91-desktop #1 [ 164.453327] Hardware name: LENOVO 7470E36/7470E36, BIOS 6DET61WW (3.11 ) 11/10/2009 This is easy to reproduce with: linux:~ # cat bin/crashme.sh ---- #!/bin/bash -x pppd local pty "netcat -l 1234" & sleep 1 pppd local pty "netcat localhost 1234" & sleep 1 ---- 3.17 works fine. I bisected the issue multiple times and always arrived at # first bad commit: [d6dd50e07c5bec00db2005969b1a01f8ca3d25ef] Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip which is a merge commit unfortunately. The BUG encountered above is in: 1309 static struct vm_struct *__get_vm_area_node(unsigned long size, 1310 unsigned long align, unsigned long flags, unsigned long start, 1311 unsigned long end, int node, gfp_t gfp_mask, const void *caller) 1312 { 1313 struct vmap_area *va; 1314 struct vm_struct *area; 1315 1316 BUG_ON(in_interrupt()); 1317 if (flags & VM_IOREMAP) 1318 align = 1ul << clamp(fls(size), PAGE_SHIFT, IOREMAP_MAX_ORDER); 1319 the call trace is: [ 164.453327] Call Trace: [ 164.453327] [] __vmalloc_node_range+0x6d/0x290 [ 164.453327] [] __vmalloc+0x3e/0x50 [ 164.453327] [] bpf_prog_alloc+0x30/0xa0 [ 164.453327] [] bpf_prog_create+0x46/0xb0 [ 164.453327] [] ppp_ioctl+0x420/0xe9a [ppp_generic] [ 164.453327] [] do_vfs_ioctl+0x2e7/0x4c0 [ 164.453327] [] SyS_ioctl+0x81/0xa0 [ 164.453327] [] system_call_fastpath+0x16/0x1b [ 164.453327] [<00007f4502d87397>] 0x7f4502d87397 I have a crashdump of the kernel, but given this is easily reproducible, I doubt that I need to send this to anyone :-) Best regards, Stefan -- Stefan Seyfried Linux Consultant & Developer -- GPG Key: 0x731B665B B1 Systems GmbH Osterfeldstraße 7 / 85088 Vohburg / http://www.b1-systems.de GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt,HRB 3537 -- 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/