Am 14.03.2014 15:57, schrieb Thomas Meyer: > Am Mittwoch, den 06.11.2013, 20:59 +0100 schrieb Richard Weinberger: >> Am 06.11.2013 20:52, schrieb Thomas Meyer: >>> Am Mittwoch, den 06.11.2013, 13:40 +0100 schrieb Richard Weinberger: >>>> On Tue, Nov 5, 2013 at 9:21 PM, Thomas Meyer <tho...@m3y3r.de> wrote: >>>>> Hi, >>>>> >>>>> I'm running Fedora 20 inside a 3.12 UML kernel and the "yum upgrade -y" >>>>> command seems to get stuck after a while/few minutes. >>>>> >>>>> Any ideas what's going one here? How to debug this? >>>>> >>>>> It looks like the process running yum is in state ptrace stopped, but >>>>> doesn't continue. >>>> >>>> Got only yum stuck or the whole UML kernel? >>> > > only some processes get stuck. > > After enabling hung task detection in the kernel I see this in the logs: > > [ 8040.100000] INFO: task jbd2/ubda-8:308 blocked for more than 120 > seconds. > [ 8040.100000] Not tainted 3.13.6 #24 > [ 8040.100000] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" > disables this message. > [ 8040.100000] jbd2/ubda-8 D 0000000040aa1c83 0 308 2 > 0x00000000 > [ 8040.100000] Stack: > [ 8040.100000] 600795a0 603f3120 b066db70 6006476d > [ 8040.100000] 1b066dbb0 b0631040 b066db80 6001c0a3 > [ 8040.100000] 600795a0 b066b380 b066dbe0 60314b4e > [ 8040.100000] Call Trace: > [ 8040.100000] [<600795a0>] ? rcu_sched_qs+0x0/0xd0 > [ 8040.100000] [<6006476d>] ? dequeue_task+0x1d/0x50 > [ 8040.100000] [<6001c0a3>] __switch_to+0x53/0x90 > [ 8040.100000] [<600795a0>] ? rcu_sched_qs+0x0/0xd0 > [ 8040.100000] [<60314b4e>] __schedule+0x1ae/0x470 > [ 8040.100000] [<60068900>] ? pick_next_task_fair+0x0/0x1a0 > [ 8040.100000] [<6006aa70>] ? prepare_to_wait+0x0/0x90 > [ 8040.100000] [<60314e43>] schedule+0x33/0x80 > [ 8040.100000] [<6020b9d4>] ? submit_bio+0xa4/0x1c0 > [ 8040.100000] [<60315030>] io_schedule+0x60/0x90 > [ 8040.100000] [<6010b7b0>] sleep_on_buffer+0x10/0x20 > [ 8040.100000] [<603153a3>] __wait_on_bit+0x63/0xa0 > [ 8040.100000] [<6010b7a0>] ? sleep_on_buffer+0x0/0x20 > [ 8040.100000] [<6010b7a0>] ? sleep_on_buffer+0x0/0x20 > [ 8040.100000] [<60315466>] out_of_line_wait_on_bit+0x86/0xa0 > [ 8040.100000] [<6010e312>] ? submit_bh+0x12/0x20 > [ 8040.100000] [<6006aed0>] ? wake_bit_function+0x0/0x40 > [ 8040.100000] [<600645e3>] ? __might_sleep+0x153/0x170 > [ 8040.100000] [<60064490>] ? __might_sleep+0x0/0x170 > [ 8040.100000] [<6010b890>] ? __wait_on_buffer+0x0/0x40 > [ 8040.100000] [<6010b8c4>] __wait_on_buffer+0x34/0x40 > [ 8040.100000] [<6019a166>] jbd2_journal_commit_transaction > +0x1696/0x19a0 > [ 8040.100000] [<60315060>] ? _cond_resched+0x0/0x50 > [ 8040.100000] [<6010d200>] ? __brelse+0x0/0x30 > [ 8040.100000] [<600330c0>] ? block_signals+0x0/0x20 > [ 8040.100000] [<6006abff>] ? finish_wait+0x6f/0x90 > [ 8040.100000] [<6006a950>] ? __wake_up+0x0/0x70 > [ 8040.100000] [<600487c0>] ? del_timer+0x0/0x60 > [ 8040.100000] [<6006a950>] ? __wake_up+0x0/0x70 > [ 8040.100000] [<6019dd5f>] kjournald2+0xdf/0x2d0 > [ 8040.100000] [<60068900>] ? pick_next_task_fair+0x0/0x1a0 > [ 8040.100000] [<6006ae90>] ? autoremove_wake_function+0x0/0x40 > [ 8040.100000] [<6019dc80>] ? kjournald2+0x0/0x2d0 > [ 8040.100000] [<6006a670>] ? __init_waitqueue_head+0x0/0x10 > [ 8040.100000] [<6019dc80>] ? kjournald2+0x0/0x2d0 > [ 8040.100000] [<6006a670>] ? __init_waitqueue_head+0x0/0x10 > [ 8040.100000] [<6005ce44>] kthread+0x114/0x140 > [ 8040.100000] [<6006442d>] ? finish_task_switch.isra.72+0x2d/0x90 > [ 8040.100000] [<600656a2>] ? schedule_tail+0x22/0xd0 > [ 8040.100000] [<6001be21>] new_thread_handler+0x81/0xb0 > [ 8040.100000] > [ 8040.100000] INFO: task yum:1082 blocked for more than 120 seconds. > [ 8040.100000] Not tainted 3.13.6 #24 > [ 8040.100000] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" > disables this message. > [ 8040.100000] yum D 0000000040aa1c83 0 1082 1073 > 0x00000000 > [ 8040.100000] Stack: > [ 8040.100000] 600795a0 603f3120 aae3fc80 6006476d > [ 8040.100000] 162b83078 b0631040 aae3fc90 6001c0a3 > [ 8040.100000] 600795a0 aadeab40 aae3fcf0 60314b4e > [ 8040.100000] Call Trace: > [ 8040.100000] [<600795a0>] ? rcu_sched_qs+0x0/0xd0 > [ 8040.100000] [<6006476d>] ? dequeue_task+0x1d/0x50 > [ 8040.100000] [<6001c0a3>] __switch_to+0x53/0x90 > [ 8040.100000] [<600795a0>] ? rcu_sched_qs+0x0/0xd0 > [ 8040.100000] [<60314b4e>] __schedule+0x1ae/0x470 > [ 8040.100000] [<60068900>] ? pick_next_task_fair+0x0/0x1a0 > [ 8040.100000] [<6003344f>] ? set_signals+0x3f/0x50 > [ 8040.100000] [<6006ace0>] ? prepare_to_wait_event+0x0/0x110 > [ 8040.100000] [<60314e10>] ? schedule+0x0/0x80 > [ 8040.100000] [<60314e43>] schedule+0x33/0x80 > [ 8040.100000] [<6006ace0>] ? prepare_to_wait_event+0x0/0x110 > [ 8040.100000] [<6019d3a3>] jbd2_log_wait_commit+0xa3/0x110 > [ 8040.100000] [<6006ae90>] ? autoremove_wake_function+0x0/0x40 > [ 8040.100000] [<6019f228>] jbd2_complete_transaction+0x48/0x90 > [ 8040.100000] [<6015162b>] ext4_sync_file+0x28b/0x320 > [ 8040.100000] [<600dba2a>] ? vfs_read+0x13a/0x190 > [ 8040.100000] [<6010a133>] do_fsync+0x53/0x80 > [ 8040.100000] [<600db73d>] ? SyS_lseek+0x7d/0x90 > [ 8040.100000] [<6010a442>] SyS_fsync+0x12/0x20 > [ 8040.100000] [<6001fa68>] handle_syscall+0x68/0x90 > [ 8040.100000] [<600370fd>] userspace+0x4fd/0x600 > [ 8040.100000] [<60031e0f>] ? save_registers+0x1f/0x40 > [ 8040.100000] [<6003a2c7>] ? arch_prctl+0x177/0x1b0 > [ 8040.100000] [<6001bed5>] fork_handler+0x85/0x90 > [ 8040.100000] > > any ideas? some synchronisation error in ext4?
Hmm, maybe you suffer from the same issue this patch tries to address: https://lkml.org/lkml/2014/2/14/733 Thanks, //richard ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
