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Subjectmm: hung task (handle_pte_fault)
Hi guys,

During fuzzing using trinity inside a KVM tools guest with latest
linux-next, I seem to be getting it hung once in a while, with the
following spew:

[ 1441.420617] INFO: task trinity:2706 blocked for more than 120 seconds.
[ 1441.421894] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1441.424493] trinity D 0000000000000000 3472 2706 16846 0x00000004
[ 1441.426749] ffff880029dbbb38 0000000000000086 ffff880029dbbae8
ffff880029dbbfd8
[ 1441.428582] 00000000001d45c0 ffff880029dba000 00000000001d45c0
00000000001d45c0
[ 1441.430156] 00000000001d45c0 00000000001d45c0 ffff880029dbbfd8
00000000001d45c0
[ 1441.432371] Call Trace:
[ 1441.433042] [<ffffffff81176dd0>] ? file_read_actor+0x1d0/0x1d0
[ 1441.434251] [<ffffffff827148d4>] schedule+0x24/0x70
[ 1441.435314] [<ffffffff82714e67>] io_schedule+0x87/0xd0
[ 1441.436357] [<ffffffff81176dd9>] sleep_on_page+0x9/0x10
[ 1441.437442] [<ffffffff82712cb7>] __wait_on_bit+0x57/0x80
[ 1441.438584] [<ffffffff81177bff>] ? __lock_page_or_retry+0x8f/0xd0
[ 1441.439948] [<ffffffff811775de>] wait_on_page_bit+0x6e/0x80
[ 1441.440859] [<ffffffff810d6d20>] ? autoremove_wake_function+0x40/0x40
[ 1441.441700] [<ffffffff810dbfbe>] ? up_read+0x1e/0x40
[ 1441.442428] [<ffffffff81177c36>] __lock_page_or_retry+0xc6/0xd0
[ 1441.443270] [<ffffffff81178490>] filemap_fault+0x440/0x4e0
[ 1441.444072] [<ffffffff811991cf>] __do_fault+0x7f/0x5f0
[ 1441.444829] [<ffffffff81112c00>] ?
add_lock_to_list.clone.18.clone.27+0xd0/0xe0
[ 1441.445886] [<ffffffff8119cd27>] handle_pte_fault+0xf7/0x1e0
[ 1441.446740] [<ffffffff8119e1ce>] handle_mm_fault+0x1ce/0x330
[ 1441.447537] [<ffffffff8119e53c>] __get_user_pages+0x14c/0x640
[ 1441.448399] [<ffffffff811129ae>] ? put_lock_stats.clone.19+0xe/0x40
[ 1441.449288] [<ffffffff81117b1d>] ? __lock_acquired+0x19d/0x270
[ 1441.450164] [<ffffffff811a0087>] __mlock_vma_pages_range+0x87/0xa0
[ 1441.451127] [<ffffffff811a0129>] do_mlock_pages+0x89/0x160
[ 1441.451932] [<ffffffff811a0b71>] sys_mlockall+0x111/0x1a0
[ 1441.452761] [<ffffffff827176bd>] system_call_fastpath+0x1a/0x1f
[ 1441.453659] no locks held by trinity/2706.
[ 1441.454267] Kernel panic - not syncing: hung_task: blocked tasks

According to the logs, it's not the direct result of anything specific
happening, so I can't give an exact scenario to reproduce it. It does
happen rather often.


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