From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932301AbcCIMiB (ORCPT ); Wed, 9 Mar 2016 07:38:01 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:47528 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752684AbcCIMhz (ORCPT ); Wed, 9 Mar 2016 07:37:55 -0500 Date: Wed, 9 Mar 2016 13:37:52 +0100 From: Pavel Machek To: kernel list Subject: 4.5-rc4: pool: segfault, systemd-udevd blocked for more than 120 seconds Message-ID: <20160309123751.GA1723@amd> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! I realized ttyUSB0 is no longer detected, then I found this in the logs: [25428.048405] r8169 0000:03:00.0 eth0: link up [27996.669945] sd 4:0:0:0: [sdc] 7744512 512-byte logical blocks: (3.97 GB/3.69 GiB) [27996.686679] sdc: sdc1 sdc2 sdc3 sdc4 [27997.850843] pool[3086]: segfault at 0 ip 000000000807ab34 sp 00000000f42fbbf0 error 4 in udisksd[8048000+62000] [29280.148056] INFO: task systemd-udevd:2094 blocked for more than 120 seconds. [29280.148061] Not tainted 4.5.0-rc4 #37 [29280.148063] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [29280.148065] systemd-udevd D ffff8800b7d0fb30 0 2094 1 0x20020000 [29280.148071] ffff8800b7d0fb30 ffff880000000001 0000000000000000 ffff8800b891c1c0 [29280.148077] ffff8800b891c960 0000000000000292 ffff8800b7d10000 ffff8800b5fe8b20 [29280.148081] ffff8800b891c1c0 00000000ffffffff 0000000000000246 ffff8800b7d0fb48 [29280.148086] Call Trace: [29280.148095] [] schedule+0x30/0x80 [29280.148099] [] schedule_preempt_disabled+0x9/0x10 [29280.148102] [] mutex_lock_nested+0x105/0x2e0 [29280.148106] [] ? __blkdev_get+0x41/0x3f0 [29280.148110] [] ? disk_block_events+0x5f/0x80 [29280.148113] [] __blkdev_get+0x41/0x3f0 [29280.148116] [] blkdev_get+0x3c/0x390 [29280.148119] [] ? _raw_spin_unlock+0x22/0x30 [29280.148122] [] ? blkdev_get_by_dev+0x50/0x50 [29280.148125] [] blkdev_open+0x56/0x70 [29280.148129] [] do_dentry_open.isra.16+0x149/0x2d0 [29280.148132] [] vfs_open+0x4d/0x50 [29280.148135] [] path_openat+0x47a/0xf80 [29280.148139] [] do_filp_open+0x79/0xd0 [29280.148143] [] ? __alloc_fd+0xb7/0x170 [29280.148146] [] ? _raw_spin_unlock+0x22/0x30 [29280.148148] [] ? __alloc_fd+0xb7/0x170 [29280.148151] [] do_sys_open+0x115/0x1e0 [29280.148155] [] compat_SyS_open+0x16/0x20 [29280.148159] [] do_syscall_32_irqs_off+0x4e/0xa0 [29280.148163] [] entry_INT80_compat+0x2a/0x40 [29280.148166] 1 lock held by systemd-udevd/2094: [29280.148167] #0: (&bdev->bd_mutex){......}, at: [] __blkdev_get+0x41/0x3f0 [29322.817302] sdc: sdc1 sdc2 sdc3 sdc4 [39510.918856] liferea[12340]: segfault at c ip 00000000080862ad sp 00000000fff5acd8 error 4 in liferea[8048000+89000] [43259.795891] nf_conntrack: automatic helper assignment is deprecated and it will be removed soon. Use the iptables CT target to attach helpers instead. [49435.300297] PM: Syncing filesystems ... done. [49435.403970] PM: Preparing system for sleep (mem) [49435.404385] Freezing user space processes ... (elapsed 0.039 seconds) done. [49435.444222] Freezing remaining freezable tasks ... (elapsed 0.004 seconds) done. I'll try to update to newer -rc, and see if it happens again, but if you have some other hints, let me know. Best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html