dmesg showed this during the event: [38319.565261] [<ffffffff8125ea38>] ? __jbd2_journal_file_buffer+0x188/0x270 [38319.565267] [<ffffffff8165a55f>] schedule+0x3f/0x60 [38319.565272] [<ffffffff8125f53d>] do_get_write_access+0x27d/0x4f0 [38319.565278] [<ffffffff811a8063>] ? __find_get_block_slow+0xd3/0x190 [38319.565284] [<ffffffff8108af00>] ? autoremove_wake_function+0x40/0x40 [38319.565289] [<ffffffff8125f8f0>] jbd2_journal_get_write_access+0x30/0x50 [38319.565295] [<ffffffff8124187e>] __ext4_journal_get_write_access+0x3e/0x80 [38319.565301] [<ffffffff81248b9b>] ext4_mb_mark_diskspace_used+0xfb/0x500 [38319.565307] [<ffffffff811642fd>] ? kmem_cache_alloc+0x11d/0x140 [38319.565311] [<ffffffff8124a23f>] ext4_mb_new_blocks+0x2bf/0x4a0 [38319.565315] [<ffffffff8123bffc>] ? ext4_ext_check_overlap.isra.20+0xbc/0xd0 [38319.565320] [<ffffffff81240a5a>] ext4_ext_map_blocks+0xc7a/0xe70 [38319.565325] [<ffffffff81310d3d>] ? radix_tree_gang_lookup_tag_slot+0x8d/0xd0 [38319.565331] [<ffffffff81215e45>] ext4_map_blocks+0x1b5/0x280 [38319.565336] [<ffffffff8121a1a9>] mpage_da_map_and_submit+0xb9/0x370 [38319.565341] [<ffffffff8121acba>] ? ext4_da_writepages+0x32a/0x640 [38319.565346] [<ffffffff8112140f>] ? tag_pages_for_writeback+0x6f/0xc0 [38319.565351] [<ffffffff8121ad11>] ext4_da_writepages+0x381/0x640 [38319.565356] [<ffffffff81122a01>] do_writepages+0x21/0x40 [38319.565361] [<ffffffff81118d3b>] __filemap_fdatawrite_range+0x5b/0x60 [38319.565366] [<ffffffff81118d92>] filemap_write_and_wait_range+0x52/0x80 [38319.565370] [<ffffffff8121101f>] ext4_sync_file+0x6f/0x2d0 [38319.565374] [<ffffffff81177c90>] ? vfs_write+0x110/0x180 [38319.565379] [<ffffffff811a6406>] do_fsync+0x56/0x80 [38319.565383] [<ffffffff811a6730>] sys_fsync+0x10/0x20 [38319.565388] [<ffffffff81664a82>] system_call_fastpath+0x16/0x1b [38319.565398] INFO: task firefox:4592 blocked for more than 120 seconds. [38319.565400] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [38319.565403] firefox D ffffffff81806240 0 4592 1 0x00000000 [38319.565408] ffff8801e8af3c78 0000000000000086 0000000000000081 ffff8801cfbb1fa0 [38319.565413] ffff8801e8af3fd8 ffff8801e8af3fd8 ffff8801e8af3fd8 0000000000013780 [38319.565418] ffff8802322616f0 ffff880232358000 ffff8801e8af3c88 ffff8801e8af3ce8 [38319.565423] Call Trace: [38319.565427] [<ffffffff8165a55f>] schedule+0x3f/0x60 [38319.565432] [<ffffffff8125f53d>] do_get_write_access+0x27d/0x4f0 [38319.565436] [<ffffffff811a8063>] ? __find_get_block_slow+0xd3/0x190 [38319.565441] [<ffffffff8108af00>] ? autoremove_wake_function+0x40/0x40 [38319.565445] [<ffffffff811a91c7>] ? __find_get_block+0x87/0xe0 [38319.565450] [<ffffffff8129d22e>] ? security_inode_alloc+0x1e/0x20 [38319.565455] [<ffffffff8125f8f0>] jbd2_journal_get_write_access+0x30/0x50 [38319.565459] [<ffffffff8124187e>] __ext4_journal_get_write_access+0x3e/0x80 [38319.565464] [<ffffffff8121288a>] ext4_new_inode+0x19a/0xb20 [38319.565469] [<ffffffff81186eea>] ? kern_path_create+0x8a/0x120 [38319.565473] [<ffffffff81220188>] ext4_mkdir+0x168/0x370 [38319.565477] [<ffffffff81183c21>] vfs_mkdir+0xa1/0x110 [38319.565481] [<ffffffff81187cf2>] sys_mkdirat+0xe2/0xf0 [38319.565485] [<ffffffff81187d18>] sys_mkdir+0x18/0x20 [38319.565489] [<ffffffff81664a82>] system_call_fastpath+0x16/0x1b [38319.565493] INFO: task firefox:4607 blocked for more than 120 seconds. [38319.565495] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [38319.565498] firefox D ffffffff81806240 0 4607 1 0x00000000 [38319.565503] ffff88020a0d5918 0000000000000086 ffff88020a0d5960 ffff88020a0d58c8 [38319.565508] ffff88020a0d5fd8 ffff88020a0d5fd8 ffff88020a0d5fd8 0000000000013780 [38319.565513] ffff8802322796f0 ffff8801e0778000 ffff88020a0d5928 ffff88020a0d5988 [38319.565518] Call Trace: [38319.565521] [<ffffffff8165a55f>] schedule+0x3f/0x60 [38319.565526] [<ffffffff8125f53d>] do_get_write_access+0x27d/0x4f0 [38319.565531] [<ffffffff811a8063>] ? __find_get_block_slow+0xd3/0x190 [38319.565535] [<ffffffff8108af00>] ? autoremove_wake_function+0x40/0x40 [38319.565539] [<ffffffff811a91c7>] ? __find_get_block+0x87/0xe0 [38319.565544] [<ffffffff8125f8f0>] jbd2_journal_get_write_access+0x30/0x50 [38319.565548] [<ffffffff8124187e>] __ext4_journal_get_write_access+0x3e/0x80 [38319.565553] [<ffffffff81248b1f>] ext4_mb_mark_diskspace_used+0x7f/0x500 [38319.565558] [<ffffffff811642fd>] ? kmem_cache_alloc+0x11d/0x140 [38319.565563] [<ffffffff8124a23f>] ext4_mb_new_blocks+0x2bf/0x4a0 [38319.565567] [<ffffffff8123bffc>] ? ext4_ext_check_overlap.isra.20+0xbc/0xd0 [38319.565571] [<ffffffff81240a5a>] ext4_ext_map_blocks+0xc7a/0xe70 [38319.565575] [<ffffffff81310d3d>] ? radix_tree_gang_lookup_tag_slot+0x8d/0xd0 [38319.565580] [<ffffffff81215e45>] ext4_map_blocks+0x1b5/0x280 [38319.565585] [<ffffffff8121a1a9>] mpage_da_map_and_submit+0xb9/0x370 [38319.565590] [<ffffffff8121ad11>] ext4_da_writepages+0x381/0x640 [38319.565594] [<ffffffff81122a01>] do_writepages+0x21/0x40 [38319.565599] [<ffffffff81118d3b>] __filemap_fdatawrite_range+0x5b/0x60 [38319.565604] [<ffffffff81118d92>] filemap_write_and_wait_range+0x52/0x80 [38319.565608] [<ffffffff8121101f>] ext4_sync_file+0x6f/0x2d0 [38319.565612] [<ffffffff81188cc2>] ? do_fcntl+0x1b2/0x340 [38319.565616] [<ffffffff811a6406>] do_fsync+0x56/0x80 [38319.565621] [<ffffffff811a6753>] sys_fdatasync+0x13/0x20 [38319.565625] [<ffffffff81664a82>] system_call_fastpath+0x16/0x1b [38319.565629] INFO: task firefox:6551 blocked for more than 120 seconds. [38319.565631] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [38319.565634] firefox D ffffffff81806240 0 6551 1 0x00000000 [38319.565639] ffff88020ac25e48 0000000000000086 ffff88020ac25e00 0000000300000001 [38319.565644] ffff88020ac25fd8 ffff88020ac25fd8 ffff88020ac25fd8 0000000000013780 [38319.565649] ffffffff81c0d020 ffff8802155fade0 ffff88020ac25e58 ffff880231c99800 [38319.565654] Call Trace: [38319.565658] [<ffffffff8165a55f>] schedule+0x3f/0x60 [38319.565662] [<ffffffff81265085>] jbd2_log_wait_commit+0xb5/0x130 [38319.565666] [<ffffffff8108aec0>] ? add_wait_queue+0x60/0x60 [38319.565670] [<ffffffff812111b8>] ext4_sync_file+0x208/0x2d0 [38319.565674] [<ffffffff81177c90>] ? vfs_write+0x110/0x180 [38319.565679] [<ffffffff811a6406>] do_fsync+0x56/0x80 [38319.565683] [<ffffffff811a6730>] sys_fsync+0x10/0x20 [38319.565687] [<ffffffff81664a82>] system_call_fastpath+0x16/0x1b [38319.565691] INFO: task dconf-service:4828 blocked for more than 120 seconds. [38319.565693] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [38319.565696] dconf-service D ffffffff81806240 0 4828 1 0x00000000 [38319.565701] ffff8801e2d25e48 0000000000000086 ffff8801e2d25e00 0000000300000001 [38319.565706] ffff8801e2d25fd8 ffff8801e2d25fd8 ffff8801e2d25fd8 0000000000013780 [38319.565711] ffffffff81c0d020 ffff88020a11dbc0 ffff8801e2d25e58 ffff880231c99800 [38319.565716] Call Trace: [38319.565720] [<ffffffff8165a55f>] schedule+0x3f/0x60 [38319.565723] [<ffffffff81265085>] jbd2_log_wait_commit+0xb5/0x130 [38319.565728] [<ffffffff8108aec0>] ? add_wait_queue+0x60/0x60 [38319.565732] [<ffffffff812111b8>] ext4_sync_file+0x208/0x2d0 [38319.565736] [<ffffffff811a6406>] do_fsync+0x56/0x80 [38319.565740] [<ffffffff811a6730>] sys_fsync+0x10/0x20 [38319.565744] [<ffffffff81664a82>] system_call_fastpath+0x16/0x1b [38319.565748] INFO: task zsh:5128 blocked for more than 120 seconds. [38319.565750] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [38319.565753] zsh D 0000000000000003 0 5128 4483 0x00000004 [38319.565757] ffff880204c2bbf8 0000000000000082 ffff880204c2bba8 ffffffff8108abae [38319.565763] ffff880204c2bfd8 ffff880204c2bfd8 ffff880204c2bfd8 0000000000013780 [38319.565768] ffff88023229c4d0 ffff8801ed03ade0 ffff880204c2bc08 ffff880204c2bc68 [38319.565773] Call Trace: [38319.565776] [<ffffffff8108abae>] ? wake_up_bit+0x2e/0x40 [38319.565780] [<ffffffff8165a55f>] schedule+0x3f/0x60 [38319.565785] [<ffffffff8125f53d>] do_get_write_access+0x27d/0x4f0 [38319.565788] [<ffffffff811a91c7>] ? __find_get_block+0x87/0xe0 [38319.565793] [<ffffffff8108af00>] ? autoremove_wake_function+0x40/0x40 [38319.565798] [<ffffffff8125f8f0>] jbd2_journal_get_write_access+0x30/0x50 [38319.565803] [<ffffffff8124187e>] __ext4_journal_get_write_access+0x3e/0x80 [38319.565807] [<ffffffff81220a4b>] ext4_orphan_add+0xbb/0x1f0 [38319.565812] [<ffffffff81221947>] ext4_unlink+0x2e7/0x300 [38319.565816] [<ffffffff81184b00>] vfs_unlink.part.26+0x80/0xf0 [38319.565820] [<ffffffff81184bac>] vfs_unlink+0x3c/0x60 [38319.565824] [<ffffffff8118721a>] do_unlinkat+0x1aa/0x1d0 [38319.565829] [<ffffffff81142ba3>] ? do_munmap+0x1f3/0x2f0 [38319.565833] [<ffffffff81187d96>] sys_unlink+0x16/0x20 [38319.565837] [<ffffffff81664a82>] system_call_fastpath+0x16/0x1b [38319.565843] INFO: task Chrome_DBThread:6317 blocked for more than 120 seconds. [38319.565846] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [38319.565849] Chrome_DBThread D ffffffff81806240 0 6317 1 0x00000000 [38319.565853] ffff8801e2405e48 0000000000000082 ffff8801e2405e00 0000000300000001 [38319.565859] ffff8801e2405fd8 ffff8801e2405fd8 ffff8801e2405fd8 0000000000013780 [38319.565864] ffff8802322796f0 ffff880202a48000 ffff8801e2405e58 ffff880231c99800 [38319.565869] Call Trace: [38319.565872] [<ffffffff8165a55f>] schedule+0x3f/0x60 [38319.565876] [<ffffffff81265085>] jbd2_log_wait_commit+0xb5/0x130 [38319.565880] [<ffffffff8108aec0>] ? add_wait_queue+0x60/0x60 [38319.565884] [<ffffffff812111b8>] ext4_sync_file+0x208/0x2d0 [38319.565888] [<ffffffff81177db0>] ? vfs_read+0xb0/0x180 [38319.565892] [<ffffffff811a6406>] do_fsync+0x56/0x80 [38319.565897] [<ffffffff811a6753>] sys_fdatasync+0x13/0x20 [38319.565901] [<ffffffff81664a82>] system_call_fastpath+0x16/0x1b [38319.565904] INFO: task Chrome_FileThre:6319 blocked for more than 120 seconds. [38319.565907] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [38319.565909] Chrome_FileThre D ffffffff81806240 0 6319 1 0x00000000 [38319.565914] ffff88021550de48 0000000000000082 ffff88021550de00 0000000300000001 [38319.565919] ffff88021550dfd8 ffff88021550dfd8 ffff88021550dfd8 0000000000013780 [38319.565924] ffff8802322616f0 ffff8801e06b5bc0 ffff88021550de58 ffff880231c99800 [38319.565929] Call Trace: [38319.565933] [<ffffffff8165a55f>] schedule+0x3f/0x60 [38319.565937] [<ffffffff81265085>] jbd2_log_wait_commit+0xb5/0x130 [38319.565941] [<ffffffff8108aec0>] ? add_wait_queue+0x60/0x60 [38319.565945] [<ffffffff812111b8>] ext4_sync_file+0x208/0x2d0 [38319.565948] [<ffffffff81177c90>] ? vfs_write+0x110/0x180 [38319.565953] [<ffffffff811a6406>] do_fsync+0x56/0x80 [38319.565957] [<ffffffff811a6730>] sys_fsync+0x10/0x20 [38319.565961] [<ffffffff81664a82>] system_call_fastpath+0x16/0x1b
** Tags added: qa-manual-testing -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/988799 Title: Precise freezes under heavy i/o To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/988799/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
