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Date: Sat, 25 Sep 2010 15:08:11 +0200 From: Torsten Kaiser <just.for.lkml@...glemail.com> To: Christoph Hellwig <hch@...radead.org> Cc: Dave Chinner <david@...morbit.com>, Yang Ruirui <ruirui.r.yang@...to.com>, Andrew Morton <akpm@...ux-foundation.org>, xfs@....sgi.com, linux-kernel@...r.kernel.org, Alex Elder <aelder@....com>, Tejun Heo <tj@...nel.org> Subject: Re: -mm: xfs lockdep warning [adding Tejun Heo, because I'm partly blaming his workqueues] On Mon, Sep 20, 2010 at 9:13 PM, Christoph Hellwig <hch@...radead.org> wrote: > On Fri, Sep 17, 2010 at 10:52:27AM +1000, Dave Chinner wrote: >> Christoph, this implies an inode that has been marked for reclaim >> that has not passed through xfs_fs_evict_inode() after being >> initialised. If it went through the eviction process, the iolock >> would have been re-initialised to a different context. Can you think >> of any path that can get here without going through ->evict? I can't >> off the top of my head... > > I think this could happen if the init_inode_always during > re-initialization of an inode in reclaim fails in iget. I have a patch > to add that I'll run through xfsqa. It should only happen very rarely. I had the same lockdep report in mainline 2.6.36-rc5, when I enabled lockdep to try to debug a hang under high load and some memory pressure. Do you have a patch I could try to get rid of this lockdep report to see, if there is another one lurking behind it? As for the hang: Today I wanted to install updates on my gentoo system and that included an update of koffice. Because I allow emerge (gentoos package manager) to process 4 packages in parallel and specify -j5 for each of the compiles the result was, that emerge decided to build 4 koffice programs in parallel which resulted in a load ~18 on my 4 core system. With all these gcc running and the compiles happening on a tmpfs this also resulted in some memory pressure. (But not in a swap storm) The first time I got this hang, I was not able to capture useful informations, the second time it happened I got a report from the hung task timeout: 3 processes where blocked in: [ 1203.056532] [<ffffffff810801c0>] ? sync_page+0x0/0x50 [ 1203.061836] [<ffffffff8156078d>] ? io_schedule+0x3d/0x60 [ 1203.067390] [<ffffffff810801fd>] ? sync_page+0x3d/0x50 probably because of these: [ 1202.872424] INFO: task plasma-desktop:3169 blocked for more than 120 seconds. [ 1202.879883] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1202.888118] ffff88011ef860b0 0000000000000086 000000011ef860b0 ffff880114faff48 [ 1202.895936] ffff8800071cf1c0 0000000000012780 ffff880114faffd8 0000000000012780 [ 1202.903777] ffff880114faffd8 ffff88011ef86310 ffff880114faffd8 ffff88011ef86308 [ 1202.911586] Call Trace: [ 1202.914140] [<ffffffff815612c1>] ? __mutex_lock_slowpath+0xe1/0x160 [ 1202.920693] [<ffffffff810d1e57>] ? __d_lookup+0x97/0x120 [ 1202.926272] [<ffffffff81560d8a>] ? mutex_lock+0x1a/0x40 [ 1202.931783] [<ffffffff810c9dbf>] ? do_lookup+0x10f/0x190 [ 1202.937426] [<ffffffff810c7e24>] ? acl_permission_check+0x54/0xb0 [ 1202.943898] [<ffffffff810ca8d9>] ? link_path_walk+0x4c9/0x9a0 [ 1202.950028] [<ffffffff810d65f4>] ? mnt_want_write+0x34/0x70 [ 1202.955947] [<ffffffff810caecf>] ? path_walk+0x5f/0xe0 [ 1202.961416] [<ffffffff810caf9b>] ? do_path_lookup+0x4b/0x50 [ 1202.967325] [<ffffffff810cbc35>] ? user_path_at+0x55/0xb0 [ 1202.973020] [<ffffffff8102e860>] ? __dequeue_entity+0x40/0x50 [ 1202.979054] [<ffffffff8107bcf4>] ? perf_event_task_sched_out+0x44/0x260 [ 1202.985995] [<ffffffff810c2e46>] ? vfs_fstatat+0x36/0x80 [ 1202.991600] [<ffffffff815602ac>] ? schedule+0x24c/0x6f0 [ 1202.997157] [<ffffffff810c2f8f>] ? sys_newstat+0x1f/0x50 [ 1203.002784] [<ffffffff81003035>] ? device_not_available+0x15/0x20 [ 1203.009204] [<ffffffff8100246b>] ? system_call_fastpath+0x16/0x1b [ 1202.400046] INFO: task kworker/u:8:845 blocked for more than 120 seconds. [ 1202.407128] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1202.415372] ffff88007ffa8b60 0000000000000046 ffff88007f74fe98 0000000000000000 [ 1202.423229] ffff8800071cf770 0000000000012780 ffff8800070e9fd8 0000000000012780 [ 1202.431054] ffff8800070e9fd8 ffff88007ffa8dc0 ffff8800070e9fd8 ffff88007ffa8db8 [ 1202.438898] Call Trace: [ 1202.441495] [<ffffffff814361ed>] ? md_write_start+0x9d/0x190 [ 1202.447536] [<ffffffff81052e70>] ? autoremove_wake_function+0x0/0x30 [ 1202.454311] [<ffffffff810925ca>] ? zone_nr_free_pages+0x9a/0xb0 [ 1202.460639] [<ffffffff8142c423>] ? make_request+0x23/0x800 [ 1202.466496] [<ffffffff811d90ea>] ? blkcipher_walk_done+0x8a/0x230 [ 1202.472990] [<ffffffff811df4c4>] ? crypto_cbc_encrypt+0xe4/0x180 [ 1202.479327] [<ffffffff8102a150>] ? twofish_encrypt+0x0/0x10 [ 1202.485276] [<ffffffff81431ac3>] ? md_make_request+0xc3/0x220 [ 1202.491412] [<ffffffff811eafca>] ? generic_make_request+0x18a/0x330 [ 1202.498096] [<ffffffff814484fc>] ? crypt_convert+0x25c/0x310 [ 1202.504090] [<ffffffff81448881>] ? kcryptd_crypt+0x2d1/0x3f0 [ 1202.510031] [<ffffffff814485b0>] ? kcryptd_crypt+0x0/0x3f0 [ 1202.516081] [<ffffffff8104d2eb>] ? process_one_work+0xfb/0x370 [ 1202.522123] [<ffffffff8104ee4c>] ? worker_thread+0x16c/0x360 [ 1202.527935] [<ffffffff8104ece0>] ? worker_thread+0x0/0x360 [ 1202.533541] [<ffffffff8104ece0>] ? worker_thread+0x0/0x360 [ 1202.539131] [<ffffffff810529e6>] ? kthread+0x96/0xa0 [ 1202.544245] [<ffffffff81003194>] ? kernel_thread_helper+0x4/0x10 [ 1202.550363] [<ffffffff81052950>] ? kthread+0x0/0xa0 [ 1202.555346] [<ffffffff81003190>] ? kernel_thread_helper+0x0/0x10 After that I enabled lockdep and retried the same update: This time no hang, only the same lockdep report that Yang Ruirui had. So I'm currently at a loss how I should continue from here. The XFS false positive drowns any other lockdep problems, but XFS had some hang problems with the new workqueues. (Personally I had no other hang with earlier 2.6.36-rcs) As seen in the call trace from the kworker, there are more workqueues involved, thats why I added Tejun to the CC. My root filesystem is XFS on dm-crypt on a md/raid1, so it might have been something there. If you need more information, just ask, I will try to provide it. Torsten -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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