Overall stalled time: 242940 ms

Time stalled in this event:    59077 ms
Event count:                       4
mutt                 sleep_on_buffer        1980 ms
latency-output       sleep_on_buffer       20272 ms
latency-output       sleep_on_buffer       19789 ms
tclsh                sleep_on_buffer       17036 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a39de>] __lock_buffer+0x2e/0x30
[<ffffffff8123a60f>] do_get_write_access+0x43f/0x4b0
[<ffffffff8123a7cb>] jbd2_journal_get_write_access+0x2b/0x50
[<ffffffff81220f79>] __ext4_journal_get_write_access+0x39/0x80
[<ffffffff811f3198>] ext4_reserve_inode_write+0x78/0xa0
[<ffffffff811f3209>] ext4_mark_inode_dirty+0x49/0x220
[<ffffffff811f57d1>] ext4_dirty_inode+0x41/0x60
[<ffffffff8119ac3e>] __mark_inode_dirty+0x4e/0x2d0
[<ffffffff8118b9b9>] update_time+0x79/0xc0
[<ffffffff8118ba98>] file_update_time+0x98/0x100
[<ffffffff81110ffc>] __generic_file_aio_write+0x17c/0x3b0
[<ffffffff811112aa>] generic_file_aio_write+0x7a/0xf0
[<ffffffff811ea853>] ext4_file_write+0x83/0xd0
[<ffffffff81172b23>] do_sync_write+0xa3/0xe0
[<ffffffff811731ae>] vfs_write+0xae/0x180
[<ffffffff8117361d>] sys_write+0x4d/0x90
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:    50129 ms
Event count:                       1
offlineimap          sleep_on_buffer       50129 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a3996>] __wait_on_buffer+0x26/0x30
[<ffffffff811f9b45>] ext4_find_entry+0x325/0x4f0
[<ffffffff811f9d39>] ext4_lookup.part.31+0x29/0x140
[<ffffffff811f9e75>] ext4_lookup+0x25/0x30
[<ffffffff8117c828>] lookup_real+0x18/0x50
[<ffffffff8117cc63>] __lookup_hash+0x33/0x40
[<ffffffff81585a23>] lookup_slow+0x40/0xa4
[<ffffffff8117f1b2>] path_lookupat+0x222/0x780
[<ffffffff8117f73f>] filename_lookup+0x2f/0xc0
[<ffffffff81182274>] user_path_at_empty+0x54/0xa0
[<ffffffff811822cc>] user_path_at+0xc/0x10
[<ffffffff81177d39>] vfs_fstatat+0x49/0xa0
[<ffffffff81177dc6>] vfs_stat+0x16/0x20
[<ffffffff81177ee5>] sys_newstat+0x15/0x30
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:    29283 ms
Event count:                       5
latency-output       wait_on_page_bit       6482 ms
tclsh                wait_on_page_bit       7756 ms
mutt                 wait_on_page_bit       7702 ms
latency-output       wait_on_page_bit       6017 ms
latency-output       wait_on_page_bit       1326 ms
[<ffffffff8110f180>] wait_on_page_bit+0x70/0x80
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff8110f44a>] generic_perform_write+0xca/0x210
[<ffffffff8110f5e8>] generic_file_buffered_write+0x58/0x90
[<ffffffff81111036>] __generic_file_aio_write+0x1b6/0x3b0
[<ffffffff811112aa>] generic_file_aio_write+0x7a/0xf0
[<ffffffff811ea853>] ext4_file_write+0x83/0xd0
[<ffffffff81172b23>] do_sync_write+0xa3/0xe0
[<ffffffff811731ae>] vfs_write+0xae/0x180
[<ffffffff8117361d>] sys_write+0x4d/0x90
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:    21871 ms
Event count:                       2
imapd                sleep_on_buffer       18495 ms
imapd                sleep_on_buffer        3376 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a39de>] __lock_buffer+0x2e/0x30
[<ffffffff8123a60f>] do_get_write_access+0x43f/0x4b0
[<ffffffff8123a7cb>] jbd2_journal_get_write_access+0x2b/0x50
[<ffffffff81220f79>] __ext4_journal_get_write_access+0x39/0x80
[<ffffffff811f3198>] ext4_reserve_inode_write+0x78/0xa0
[<ffffffff811f3209>] ext4_mark_inode_dirty+0x49/0x220
[<ffffffff811f57d1>] ext4_dirty_inode+0x41/0x60
[<ffffffff8119ac3e>] __mark_inode_dirty+0x4e/0x2d0
[<ffffffff8118b9b9>] update_time+0x79/0xc0
[<ffffffff8118bc61>] touch_atime+0x161/0x170
[<ffffffff81110683>] do_generic_file_read.constprop.35+0x363/0x440
[<ffffffff811113f9>] generic_file_aio_read+0xd9/0x220
[<ffffffff81172c03>] do_sync_read+0xa3/0xe0
[<ffffffff8117332b>] vfs_read+0xab/0x170
[<ffffffff8117358d>] sys_read+0x4d/0x90
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:    20849 ms
Event count:                       1
awesome              sleep_on_buffer       20849 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a39de>] __lock_buffer+0x2e/0x30
[<ffffffff8123a60f>] do_get_write_access+0x43f/0x4b0
[<ffffffff8123a7cb>] jbd2_journal_get_write_access+0x2b/0x50
[<ffffffff81220f79>] __ext4_journal_get_write_access+0x39/0x80
[<ffffffff811f3198>] ext4_reserve_inode_write+0x78/0xa0
[<ffffffff811fbd0f>] ext4_orphan_add+0x10f/0x1f0
[<ffffffff811f37b4>] ext4_setattr+0x3d4/0x640
[<ffffffff8118d362>] notify_change+0x1f2/0x3c0
[<ffffffff81171689>] do_truncate+0x59/0xa0
[<ffffffff8117d386>] handle_truncate+0x66/0xa0
[<ffffffff81181506>] do_last+0x626/0x820
[<ffffffff811817b3>] path_openat+0xb3/0x4a0
[<ffffffff8118230d>] do_filp_open+0x3d/0xa0
[<ffffffff811727f9>] do_sys_open+0xf9/0x1e0
[<ffffffff811728fc>] sys_open+0x1c/0x20
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     7872 ms
Event count:                       1
dconf-service        sleep_on_buffer        7872 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a3996>] __wait_on_buffer+0x26/0x30
[<ffffffff811f9b45>] ext4_find_entry+0x325/0x4f0
[<ffffffff811fbef5>] ext4_rename+0x105/0x980
[<ffffffff8117d6ed>] vfs_rename_other+0xcd/0x120
[<ffffffff81180326>] vfs_rename+0xb6/0x240
[<ffffffff81182e96>] sys_renameat+0x386/0x3d0
[<ffffffff81182ef6>] sys_rename+0x16/0x20
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     6265 ms
Event count:                       3
dconf-service        wait_on_page_bit       3486 ms
pool                 wait_on_page_bit       1059 ms
Cache I/O            wait_on_page_bit       1720 ms
[<ffffffff8110f180>] wait_on_page_bit+0x70/0x80
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff81110cf0>] filemap_write_and_wait_range+0x60/0x70
[<ffffffff811ea9fa>] ext4_sync_file+0x6a/0x2d0
[<ffffffff811a1b88>] do_fsync+0x58/0x80
[<ffffffff811a1eeb>] sys_fsync+0xb/0x10
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     5349 ms
Event count:                       1
dconf-service        sleep_on_buffer        5349 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a39de>] __lock_buffer+0x2e/0x30
[<ffffffff8123a60f>] do_get_write_access+0x43f/0x4b0
[<ffffffff8123a7cb>] jbd2_journal_get_write_access+0x2b/0x50
[<ffffffff81220f79>] __ext4_journal_get_write_access+0x39/0x80
[<ffffffff81227c94>] ext4_mb_mark_diskspace_used+0x74/0x4d0
[<ffffffff812293af>] ext4_mb_new_blocks+0x2af/0x490
[<ffffffff8121fbb1>] ext4_ext_map_blocks+0x501/0xa00
[<ffffffff811f0455>] ext4_map_blocks+0x2d5/0x470
[<ffffffff811f451a>] mpage_da_map_and_submit+0xba/0x2f0
[<ffffffff811f5020>] ext4_da_writepages+0x380/0x620
[<ffffffff8111aceb>] do_writepages+0x1b/0x30
[<ffffffff81110c89>] __filemap_fdatawrite_range+0x49/0x50
[<ffffffff81110cda>] filemap_write_and_wait_range+0x4a/0x70
[<ffffffff811ea9fa>] ext4_sync_file+0x6a/0x2d0
[<ffffffff811a1b88>] do_fsync+0x58/0x80
[<ffffffff811a1eeb>] sys_fsync+0xb/0x10
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     5168 ms
Event count:                       2
evolution            wait_on_page_bit_killable   1177 ms
firefox              wait_on_page_bit_killable   3991 ms
[<ffffffff81111668>] wait_on_page_bit_killable+0x78/0x80
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff81111b18>] filemap_fault+0x3d8/0x410
[<ffffffff81135b2a>] __do_fault+0x6a/0x530
[<ffffffff8113964e>] handle_pte_fault+0xee/0x200
[<ffffffff8113a8c1>] handle_mm_fault+0x271/0x390
[<ffffffff81598e29>] __do_page_fault+0x169/0x520
[<ffffffff815991e9>] do_page_fault+0x9/0x10
[<ffffffff81595948>] page_fault+0x28/0x30
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     4929 ms
Event count:                       1
flush-253:0          sleep_on_buffer        4929 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a39de>] __lock_buffer+0x2e/0x30
[<ffffffff8123a60f>] do_get_write_access+0x43f/0x4b0
[<ffffffff8123a7cb>] jbd2_journal_get_write_access+0x2b/0x50
[<ffffffff81220f79>] __ext4_journal_get_write_access+0x39/0x80
[<ffffffff81227c94>] ext4_mb_mark_diskspace_used+0x74/0x4d0
[<ffffffff812293af>] ext4_mb_new_blocks+0x2af/0x490
[<ffffffff8121fbb1>] ext4_ext_map_blocks+0x501/0xa00
[<ffffffff811f0455>] ext4_map_blocks+0x2d5/0x470
[<ffffffff811f451a>] mpage_da_map_and_submit+0xba/0x2f0
[<ffffffff811f5020>] ext4_da_writepages+0x380/0x620
[<ffffffff8111aceb>] do_writepages+0x1b/0x30
[<ffffffff81199ce0>] __writeback_single_inode+0x40/0x1b0
[<ffffffff8119c38a>] writeback_sb_inodes+0x19a/0x350
[<ffffffff8119c5d6>] __writeback_inodes_wb+0x96/0xc0
[<ffffffff8119c87b>] wb_writeback+0x27b/0x330
[<ffffffff8119e280>] wb_do_writeback+0x190/0x1d0
[<ffffffff8119e343>] bdi_writeback_thread+0x83/0x280
[<ffffffff8106901b>] kthread+0xbb/0xc0
[<ffffffff8159d57c>] ret_from_fork+0x7c/0xb0
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     4840 ms
Event count:                       1
systemd-journal      sleep_on_buffer        4840 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a39de>] __lock_buffer+0x2e/0x30
[<ffffffff8123a60f>] do_get_write_access+0x43f/0x4b0
[<ffffffff8123a7cb>] jbd2_journal_get_write_access+0x2b/0x50
[<ffffffff81220f79>] __ext4_journal_get_write_access+0x39/0x80
[<ffffffff81227c94>] ext4_mb_mark_diskspace_used+0x74/0x4d0
[<ffffffff812293af>] ext4_mb_new_blocks+0x2af/0x490
[<ffffffff8121fbb1>] ext4_ext_map_blocks+0x501/0xa00
[<ffffffff811f0455>] ext4_map_blocks+0x2d5/0x470
[<ffffffff8122045f>] ext4_fallocate+0x1cf/0x420
[<ffffffff81171be2>] do_fallocate+0x112/0x190
[<ffffffff81171cb2>] sys_fallocate+0x52/0x90
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     4739 ms
Event count:                       1
pool                 sleep_on_buffer        4739 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a39de>] __lock_buffer+0x2e/0x30
[<ffffffff8123a60f>] do_get_write_access+0x43f/0x4b0
[<ffffffff8123a7cb>] jbd2_journal_get_write_access+0x2b/0x50
[<ffffffff81220f79>] __ext4_journal_get_write_access+0x39/0x80
[<ffffffff811f3198>] ext4_reserve_inode_write+0x78/0xa0
[<ffffffff811f3209>] ext4_mark_inode_dirty+0x49/0x220
[<ffffffff811fb47e>] ext4_link+0x10e/0x1b0
[<ffffffff81182033>] vfs_link+0x113/0x1c0
[<ffffffff81182aa4>] sys_linkat+0x174/0x1c0
[<ffffffff81182b09>] sys_link+0x19/0x20
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     3358 ms
Event count:                       2
imapd                wait_on_page_bit       1726 ms
imapd                wait_on_page_bit       1632 ms
[<ffffffff8110f180>] wait_on_page_bit+0x70/0x80
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff8111d700>] truncate_inode_pages+0x10/0x20
[<ffffffff811f53cf>] ext4_evict_inode+0x10f/0x4d0
[<ffffffff8118beef>] evict+0xaf/0x1b0
[<ffffffff8118c771>] iput_final+0xd1/0x160
[<ffffffff8118c839>] iput+0x39/0x50
[<ffffffff81187418>] dentry_iput+0x98/0xe0
[<ffffffff81188cb8>] dput+0x128/0x230
[<ffffffff81182e4a>] sys_renameat+0x33a/0x3d0
[<ffffffff81182ef6>] sys_rename+0x16/0x20
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     3294 ms
Event count:                       1
imapd                sleep_on_buffer        3294 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a3996>] __wait_on_buffer+0x26/0x30
[<ffffffff811f9b45>] ext4_find_entry+0x325/0x4f0
[<ffffffff811fca21>] ext4_unlink+0x41/0x350
[<ffffffff8117dcef>] vfs_unlink.part.31+0x7f/0xe0
[<ffffffff8117fbd7>] vfs_unlink+0x37/0x50
[<ffffffff8117fdff>] do_unlinkat+0x20f/0x260
[<ffffffff81182811>] sys_unlink+0x11/0x20
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     2608 ms
Event count:                       1
pool                 sleep_on_buffer        2608 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a39de>] __lock_buffer+0x2e/0x30
[<ffffffff8123a60f>] do_get_write_access+0x43f/0x4b0
[<ffffffff8123a7cb>] jbd2_journal_get_write_access+0x2b/0x50
[<ffffffff81220f79>] __ext4_journal_get_write_access+0x39/0x80
[<ffffffff812298fa>] ext4_free_blocks+0x36a/0xbe0
[<ffffffff8121c3b6>] ext4_remove_blocks+0x256/0x2d0
[<ffffffff8121c635>] ext4_ext_rm_leaf+0x205/0x520
[<ffffffff8121e37c>] ext4_ext_remove_space+0x4dc/0x750
[<ffffffff8122024b>] ext4_ext_truncate+0x19b/0x1e0
[<ffffffff811efb25>] ext4_truncate.part.60+0xd5/0xf0
[<ffffffff811f0c24>] ext4_truncate+0x34/0x90
[<ffffffff811f356d>] ext4_setattr+0x18d/0x640
[<ffffffff8118d362>] notify_change+0x1f2/0x3c0
[<ffffffff81171689>] do_truncate+0x59/0xa0
[<ffffffff8117d386>] handle_truncate+0x66/0xa0
[<ffffffff81181506>] do_last+0x626/0x820
[<ffffffff811817b3>] path_openat+0xb3/0x4a0
[<ffffffff8118230d>] do_filp_open+0x3d/0xa0
[<ffffffff811727f9>] do_sys_open+0xf9/0x1e0
[<ffffffff811728fc>] sys_open+0x1c/0x20
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     2546 ms
Event count:                       1
offlineimap          sleep_on_buffer        2546 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a39de>] __lock_buffer+0x2e/0x30
[<ffffffff8123a60f>] do_get_write_access+0x43f/0x4b0
[<ffffffff8123a7cb>] jbd2_journal_get_write_access+0x2b/0x50
[<ffffffff81220f79>] __ext4_journal_get_write_access+0x39/0x80
[<ffffffff811fa412>] ext4_dx_add_entry+0xc2/0x590
[<ffffffff811faf65>] ext4_add_entry+0x265/0x2d0
[<ffffffff811fc556>] ext4_rename+0x766/0x980
[<ffffffff8117d6ed>] vfs_rename_other+0xcd/0x120
[<ffffffff81180326>] vfs_rename+0xb6/0x240
[<ffffffff81182e96>] sys_renameat+0x386/0x3d0
[<ffffffff81182ef6>] sys_rename+0x16/0x20
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     2199 ms
Event count:                       1
folder-markup.s      sleep_on_buffer        2199 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a39de>] __lock_buffer+0x2e/0x30
[<ffffffff8123a60f>] do_get_write_access+0x43f/0x4b0
[<ffffffff8123a7cb>] jbd2_journal_get_write_access+0x2b/0x50
[<ffffffff81220f79>] __ext4_journal_get_write_access+0x39/0x80
[<ffffffff811fa412>] ext4_dx_add_entry+0xc2/0x590
[<ffffffff811faf65>] ext4_add_entry+0x265/0x2d0
[<ffffffff811faff6>] ext4_add_nondir+0x26/0x80
[<ffffffff811fb2df>] ext4_create+0xff/0x190
[<ffffffff81180ca5>] vfs_create+0xb5/0x120
[<ffffffff81180e4e>] lookup_open+0x13e/0x1d0
[<ffffffff811811e7>] do_last+0x307/0x820
[<ffffffff811817b3>] path_openat+0xb3/0x4a0
[<ffffffff8118230d>] do_filp_open+0x3d/0xa0
[<ffffffff811727f9>] do_sys_open+0xf9/0x1e0
[<ffffffff811728fc>] sys_open+0x1c/0x20
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     2124 ms
Event count:                       2
evolution            sleep_on_buffer        1088 ms
imapd                sleep_on_buffer        1036 ms
[<ffffffff8110efb2>] __lock_page_killable+0x62/0x70
[<ffffffff811105a7>] do_generic_file_read.constprop.35+0x287/0x440
[<ffffffff811113f9>] generic_file_aio_read+0xd9/0x220
[<ffffffff81172c03>] do_sync_read+0xa3/0xe0
[<ffffffff8117332b>] vfs_read+0xab/0x170
[<ffffffff8117358d>] sys_read+0x4d/0x90
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     1220 ms
Event count:                       1
jbd2/dm-0-8          sleep_on_buffer        1220 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a3996>] __wait_on_buffer+0x26/0x30
[<ffffffff8123c6d1>] jbd2_journal_commit_transaction+0x1241/0x13c0
[<ffffffff81240d33>] kjournald2+0xb3/0x240
[<ffffffff8106901b>] kthread+0xbb/0xc0
[<ffffffff8159d57c>] ret_from_fork+0x7c/0xb0
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     1088 ms
Event count:                       1
firefox              sleep_on_buffer        1088 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a3996>] __wait_on_buffer+0x26/0x30
[<ffffffff811ef5de>] __ext4_get_inode_loc+0x1be/0x3f0
[<ffffffff811f133e>] ext4_iget+0x7e/0x940
[<ffffffff811f9dd6>] ext4_lookup.part.31+0xc6/0x140
[<ffffffff811f9e75>] ext4_lookup+0x25/0x30
[<ffffffff8117c828>] lookup_real+0x18/0x50
[<ffffffff8117cc63>] __lookup_hash+0x33/0x40
[<ffffffff81585a23>] lookup_slow+0x40/0xa4
[<ffffffff8117f1b2>] path_lookupat+0x222/0x780
[<ffffffff8117f73f>] filename_lookup+0x2f/0xc0
[<ffffffff81182274>] user_path_at_empty+0x54/0xa0
[<ffffffff811822cc>] user_path_at+0xc/0x10
[<ffffffff81171d87>] sys_faccessat+0x97/0x220
[<ffffffff81171f23>] sys_access+0x13/0x20
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     1076 ms
Event count:                       1
imapd                sleep_on_buffer        1076 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a3996>] __wait_on_buffer+0x26/0x30
[<ffffffff811e7cc8>] ext4_wait_block_bitmap+0xb8/0xc0
[<ffffffff81224d6e>] ext4_mb_init_cache+0x1ce/0x730
[<ffffffff8122536e>] ext4_mb_init_group+0x9e/0x100
[<ffffffff812254d7>] ext4_mb_good_group+0x107/0x1a0
[<ffffffff81227973>] ext4_mb_regular_allocator+0x183/0x430
[<ffffffff812294f6>] ext4_mb_new_blocks+0x3f6/0x490
[<ffffffff8121fbb1>] ext4_ext_map_blocks+0x501/0xa00
[<ffffffff811f0455>] ext4_map_blocks+0x2d5/0x470
[<ffffffff811f451a>] mpage_da_map_and_submit+0xba/0x2f0
[<ffffffff811f5020>] ext4_da_writepages+0x380/0x620
[<ffffffff8111aceb>] do_writepages+0x1b/0x30
[<ffffffff81110c89>] __filemap_fdatawrite_range+0x49/0x50
[<ffffffff81111557>] filemap_flush+0x17/0x20
[<ffffffff811f0964>] ext4_alloc_da_blocks+0x44/0xa0
[<ffffffff811ea6b1>] ext4_release_file+0x61/0xd0
[<ffffffff811744a0>] __fput+0xb0/0x240
[<ffffffff81174639>] ____fput+0x9/0x10
[<ffffffff81065cf7>] task_work_run+0x97/0xd0
[<ffffffff81002cbc>] do_notify_resume+0x9c/0xb0
[<ffffffff8159d8ea>] int_signal+0x12/0x17
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     1042 ms
Event count:                       1
offlineimap          wait_on_page_bit       1042 ms
[<ffffffff811eab95>] ext4_sync_file+0x205/0x2d0
[<ffffffff811a1b88>] do_fsync+0x58/0x80
[<ffffffff811a1eeb>] sys_fsync+0xb/0x10
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     1011 ms
Event count:                       1
firefox              sleep_on_buffer        1011 ms
[<ffffffff81597b84>] kretprobe_trampoline+0x0/0x4c
[<ffffffff811a3996>] __wait_on_buffer+0x26/0x30
[<ffffffff811ef5de>] __ext4_get_inode_loc+0x1be/0x3f0
[<ffffffff811f133e>] ext4_iget+0x7e/0x940
[<ffffffff811f9dd6>] ext4_lookup.part.31+0xc6/0x140
[<ffffffff811f9e75>] ext4_lookup+0x25/0x30
[<ffffffff8117c828>] lookup_real+0x18/0x50
[<ffffffff8117cc63>] __lookup_hash+0x33/0x40
[<ffffffff81585a23>] lookup_slow+0x40/0xa4
[<ffffffff8117f1b2>] path_lookupat+0x222/0x780
[<ffffffff8117f73f>] filename_lookup+0x2f/0xc0
[<ffffffff81182274>] user_path_at_empty+0x54/0xa0
[<ffffffff811822cc>] user_path_at+0xc/0x10
[<ffffffff81177d39>] vfs_fstatat+0x49/0xa0
[<ffffffff81177dc6>] vfs_stat+0x16/0x20
[<ffffffff81177ee5>] sys_newstat+0x15/0x30
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:     1003 ms
Event count:                       1
folder-markup.s      sleep_on_buffer        1003 ms
[<ffffffff8117bb0e>] pipe_read+0x20e/0x340
[<ffffffff81172c03>] do_sync_read+0xa3/0xe0
[<ffffffff8117332b>] vfs_read+0xab/0x170
[<ffffffff8117358d>] sys_read+0x4d/0x90
[<ffffffff8159d62d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Time stalled in this event:        0 ms
Event count:                       1