[Bug 110827] New: igt@* - ??? - INFO: rcu_preempt detected stalls on CPUs/task
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Mon Jun 3 12:08:04 UTC 2019
https://bugs.freedesktop.org/show_bug.cgi?id=110827
Bug ID: 110827
Summary: igt@* - ??? - INFO: rcu_preempt detected stalls on
CPUs/task
Product: DRI
Version: XOrg git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: DRM/Intel
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: martin.peres at free.fr
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3090/shard-kbl1/igt@runner@aborted.html
<7>[ 1164.108687] [IGT] gem_linear_blits: executing
<7>[ 1164.122349] [IGT] gem_linear_blits: starting subtest interruptible
<7>[ 1207.432663] [IGT] gem_linear_blits: exiting, ret=0
<5>[ 1207.433172] Setting dangerous option reset - tainting kernel
<3>[ 1229.235241] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
<3>[ 1229.235357] rcu: Tasks blocked on level-0 rcu_node (CPUs 0-3): P920 P922
<4>[ 1229.235515] (detected by 1, t=65002 jiffies, g=321445, q=250325)
<6>[ 1229.235518] java R running task 13488 920 875
0x00004000
<4>[ 1229.235524] Call Trace:
<4>[ 1229.235530] ? lockdep_hardirqs_on+0xe3/0x1b0
<4>[ 1229.235534] ? trace_hardirqs_on_thunk+0x1a/0x1c
<4>[ 1229.235542] ? retint_kernel+0x2b/0x2b
<4>[ 1229.235551] ? lock_is_held_type+0xe0/0x120
<4>[ 1229.235558] ? xas_descend+0xed/0x120
<4>[ 1229.235563] ? xas_load+0x39/0x50
<4>[ 1229.235567] ? find_get_entry+0xa2/0x300
<4>[ 1229.235575] ? pagecache_get_page+0x2b/0x220
<4>[ 1229.235580] ? lookup_swap_cache+0x3b/0x100
<4>[ 1229.235584] ? do_swap_page+0x86/0x920
<4>[ 1229.235592] ? __handle_mm_fault+0x676/0xfc0
<4>[ 1229.235603] ? handle_mm_fault+0x155/0x350
<4>[ 1229.235608] ? __do_page_fault+0x248/0x4f0
<4>[ 1229.235614] ? page_fault+0x8/0x30
<4>[ 1229.235617] ? page_fault+0x1e/0x30
<6>[ 1229.235627] java R running task 11624 922 875
0x00004000
<4>[ 1229.235632] Call Trace:
<4>[ 1229.235637] ? mark_held_locks+0x49/0x70
<4>[ 1229.235640] ? trace_hardirqs_on_thunk+0x1a/0x1c
<4>[ 1229.235643] ? trace_hardirqs_on_thunk+0x1a/0x1c
<4>[ 1229.235645] ? lockdep_hardirqs_on+0xe3/0x1b0
<4>[ 1229.235648] ? trace_hardirqs_on_thunk+0x1a/0x1c
<4>[ 1229.235655] ? retint_kernel+0x2b/0x2b
<4>[ 1229.235664] ? rcu_lockdep_current_cpu_online+0x33/0x80
<4>[ 1229.235667] ? rcu_lockdep_current_cpu_online+0x58/0x80
<4>[ 1229.235671] ? rcu_read_lock_held+0x37/0x50
<4>[ 1229.235677] ? xas_load+0x39/0x50
<4>[ 1229.235680] ? find_get_entry+0xa2/0x300
<4>[ 1229.235688] ? pagecache_get_page+0x2b/0x220
<4>[ 1229.235693] ? lookup_swap_cache+0x3b/0x100
<4>[ 1229.235696] ? do_swap_page+0x86/0x920
<4>[ 1229.235703] ? __handle_mm_fault+0x676/0xfc0
<4>[ 1229.235714] ? handle_mm_fault+0x155/0x350
<4>[ 1229.235719] ? __do_page_fault+0x248/0x4f0
<4>[ 1229.235724] ? page_fault+0x8/0x30
<4>[ 1229.235728] ? page_fault+0x1e/0x30
<3>[ 1291.843256] INFO: task khugepaged:38 blocked for more than 61 seconds.
<3>[ 1291.843378] Tainted: G U W 5.2.0-rc2-CI-CI_DRM_6175+
#1
<3>[ 1291.843402] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
<6>[ 1291.843429] khugepaged D12968 38 2 0x80004000
<4>[ 1291.843434] Call Trace:
<4>[ 1291.843443] ? __schedule+0x311/0x840
<4>[ 1291.843449] ? rwsem_down_write_failed+0x1c2/0x2d0
<4>[ 1291.843453] schedule+0x2e/0xb0
<4>[ 1291.843456] rwsem_down_write_failed+0x1c7/0x2d0
<4>[ 1291.843467] ? down_write+0x5f/0x70
<4>[ 1291.843469] ? down_write+0x33/0x70
<4>[ 1291.843471] down_write+0x5f/0x70
<4>[ 1291.843476] khugepaged+0x156c/0x2560
<4>[ 1291.843493] ? wait_woken+0xa0/0xa0
<4>[ 1291.843500] ? collapse_shmem.isra.8+0xe50/0xe50
<4>[ 1291.843503] kthread+0x119/0x130
<4>[ 1291.843507] ? kthread_park+0x80/0x80
<4>[ 1291.843511] ret_from_fork+0x3a/0x50
<3>[ 1291.843529] INFO: task java:914 blocked for more than 61 seconds.
<3>[ 1291.843551] Tainted: G U W 5.2.0-rc2-CI-CI_DRM_6175+
#1
<3>[ 1291.843575] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
<6>[ 1291.843601] java D13704 914 875 0x00004000
<4>[ 1291.843606] Call Trace:
<4>[ 1291.843612] ? __schedule+0x311/0x840
<4>[ 1291.843617] ? rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.843622] schedule+0x2e/0xb0
<4>[ 1291.843624] rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.843635] ? down_read+0x65/0xd0
<4>[ 1291.843637] down_read+0x65/0xd0
<4>[ 1291.843641] __do_page_fault+0x3d9/0x4f0
<4>[ 1291.843646] ? page_fault+0x8/0x30
<4>[ 1291.843650] page_fault+0x1e/0x30
<4>[ 1291.843653] RIP: 0033:0x7fd7ebb14353
<4>[ 1291.843658] Code: Bad RIP value.
<4>[ 1291.843660] RSP: 002b:00007fd7c7cfbc40 EFLAGS: 00010206
<4>[ 1291.843663] RAX: 0000000000000001 RBX: 00007fd7ac112bb0 RCX:
0000000000000006
<4>[ 1291.843665] RDX: 0000000000000000 RSI: 00007fd7d5509840 RDI:
00007fd7d5509850
<4>[ 1291.843667] RBP: 00007fd7c7cfbca0 R08: 0000000000000000 R09:
0000000000000000
<4>[ 1291.843669] R10: 0000000000000000 R11: 0000000000000206 R12:
00007fd7ec0dd6f2
<4>[ 1291.843671] R13: 00007fd7ec0dd96c R14: 0000000000000013 R15:
00007fd7ac3b7800
<3>[ 1291.843683] INFO: task java:923 blocked for more than 61 seconds.
<3>[ 1291.843705] Tainted: G U W 5.2.0-rc2-CI-CI_DRM_6175+
#1
<3>[ 1291.843728] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
<6>[ 1291.843755] java D13704 923 875 0x00000000
<4>[ 1291.843759] Call Trace:
<4>[ 1291.843765] ? __schedule+0x311/0x840
<4>[ 1291.843770] ? rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.843774] schedule+0x2e/0xb0
<4>[ 1291.843777] rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.843787] ? down_read+0x65/0xd0
<4>[ 1291.843790] down_read+0x65/0xd0
<4>[ 1291.843793] __do_page_fault+0x3d9/0x4f0
<4>[ 1291.843798] ? page_fault+0x8/0x30
<4>[ 1291.843802] page_fault+0x1e/0x30
<4>[ 1291.843804] RIP: 0033:0x7fd7ebb3dc5e
<4>[ 1291.843808] Code: Bad RIP value.
<4>[ 1291.843810] RSP: 002b:00007fd7c6bb7ac0 EFLAGS: 00010202
<4>[ 1291.843812] RAX: 00007fd7ac0010d0 RBX: 00007fd7ac0010d0 RCX:
00007fd7ec31e320
<4>[ 1291.843814] RDX: 00007fd7ac0010f0 RSI: 0000000000000001 RDI:
0000000000000010
<4>[ 1291.843816] RBP: 00007fd7c6bb7ad0 R08: 00007fd7d499f228 R09:
0000000000000010
<4>[ 1291.843818] R10: 0000000000000011 R11: 0000000000000010 R12:
00007fd7c6bb7b30
<4>[ 1291.843820] R13: 0000000000000000 R14: 0000000000000001 R15:
00007fd7ebca2f10
<3>[ 1291.843831] INFO: task java:924 blocked for more than 61 seconds.
<3>[ 1291.843852] Tainted: G U W 5.2.0-rc2-CI-CI_DRM_6175+
#1
<3>[ 1291.843876] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
<6>[ 1291.843902] java D12944 924 875 0x00000000
<4>[ 1291.843907] Call Trace:
<4>[ 1291.843912] ? __schedule+0x311/0x840
<4>[ 1291.843917] ? rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.843922] schedule+0x2e/0xb0
<4>[ 1291.843925] rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.843935] ? down_read+0x65/0xd0
<4>[ 1291.843937] down_read+0x65/0xd0
<4>[ 1291.843940] __do_page_fault+0x3d9/0x4f0
<4>[ 1291.843946] ? page_fault+0x8/0x30
<4>[ 1291.843949] page_fault+0x1e/0x30
<4>[ 1291.843951] RIP: 0033:0x7fd7d564a858
<4>[ 1291.843955] Code: Bad RIP value.
<4>[ 1291.843956] RSP: 002b:00007fd7c6ab77c0 EFLAGS: 00010202
<4>[ 1291.843959] RAX: 00000000d8e3bf10 RBX: 0000000000000000 RCX:
00000000200000ed
<4>[ 1291.843961] RDX: 0000000100000768 RSI: 00000000000000e6 RDI:
000000000000072d
<4>[ 1291.843963] RBP: 00007fd7c6ab79c0 R08: 00000000d8e3b7d0 R09:
000000000000072d
<4>[ 1291.843965] R10: 0000000000000005 R11: 00000000d8e3a778 R12:
0000000000000000
<4>[ 1291.843967] R13: 0000000000001000 R14: 00000000d8e3b7e0 R15:
00007fd7e43c8000
<3>[ 1291.843978] INFO: task java:931 blocked for more than 61 seconds.
<3>[ 1291.843999] Tainted: G U W 5.2.0-rc2-CI-CI_DRM_6175+
#1
<3>[ 1291.844022] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
<6>[ 1291.844049] java D14232 931 875 0x00000000
<4>[ 1291.844053] Call Trace:
<4>[ 1291.844059] ? __schedule+0x311/0x840
<4>[ 1291.844064] ? rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.844069] schedule+0x2e/0xb0
<4>[ 1291.844071] rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.844081] ? down_read+0x65/0xd0
<4>[ 1291.844084] down_read+0x65/0xd0
<4>[ 1291.844087] __do_page_fault+0x3d9/0x4f0
<4>[ 1291.844092] ? page_fault+0x8/0x30
<4>[ 1291.844096] page_fault+0x1e/0x30
<4>[ 1291.844098] RIP: 0033:0x7fd7ec1121c3
<4>[ 1291.844101] Code: Bad RIP value.
<4>[ 1291.844103] RSP: 002b:00007fd7c5e7d650 EFLAGS: 00010202
<4>[ 1291.844106] RAX: ffffffffffffff92 RBX: 00007fd78c052d50 RCX:
00007fd7ec111ed9
<4>[ 1291.844108] RDX: 0000000000000000 RSI: 0000000000000080 RDI:
0000000000000000
<4>[ 1291.844110] RBP: 0000000000000000 R08: 0000000000000000 R09:
00007ffea53f8080
<4>[ 1291.844112] R10: 00007fd7c5e7d6b0 R11: 0000000000000246 R12:
00007fd78c052d28
<4>[ 1291.844114] R13: 00007fd78c052d78 R14: 00007fd7c5e7d760 R15:
00007fd78c052d74
<3>[ 1291.844125] INFO: task java:935 blocked for more than 61 seconds.
<3>[ 1291.844146] Tainted: G U W 5.2.0-rc2-CI-CI_DRM_6175+
#1
<3>[ 1291.844169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
<6>[ 1291.844196] java D13816 935 875 0x00000000
<4>[ 1291.844200] Call Trace:
<4>[ 1291.844206] ? __schedule+0x311/0x840
<4>[ 1291.844211] ? rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.844215] schedule+0x2e/0xb0
<4>[ 1291.844218] rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.844228] ? down_read+0x65/0xd0
<4>[ 1291.844230] down_read+0x65/0xd0
<4>[ 1291.844234] __do_page_fault+0x3d9/0x4f0
<4>[ 1291.844264] ? page_fault+0x8/0x30
<4>[ 1291.844268] page_fault+0x1e/0x30
<4>[ 1291.844271] RIP: 0033:0x7fd7eba54d96
<4>[ 1291.844275] Code: Bad RIP value.
<4>[ 1291.844277] RSP: 002b:00007fd7d40f75d0 EFLAGS: 00010202
<4>[ 1291.844279] RAX: 00007fd7ecf5f100 RBX: 00007fd77c03a000 RCX:
0000000000000000
<4>[ 1291.844281] RDX: 00007fd77c03ae28 RSI: 0000000000000000 RDI:
00007fd77c03ae28
<4>[ 1291.844283] RBP: 00007fd7d40f7650 R08: 0000000000000000 R09:
0000000000000080
<4>[ 1291.844285] R10: 00007fd7d40f74b0 R11: 0000000000000206 R12:
00000000000003e8
<4>[ 1291.844287] R13: 00007fd7ec0e35ec R14: 0000000000000000 R15:
00007fd77800f878
<3>[ 1291.844298] INFO: task java:1679 blocked for more than 61 seconds.
<3>[ 1291.844320] Tainted: G U W 5.2.0-rc2-CI-CI_DRM_6175+
#1
<3>[ 1291.844344] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
<6>[ 1291.844371] java D13680 1679 875 0x00000000
<4>[ 1291.844375] Call Trace:
<4>[ 1291.844381] ? __schedule+0x311/0x840
<4>[ 1291.844386] ? rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.844390] schedule+0x2e/0xb0
<4>[ 1291.844393] rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.844403] ? down_read+0x65/0xd0
<4>[ 1291.844405] down_read+0x65/0xd0
<4>[ 1291.844408] __do_page_fault+0x3d9/0x4f0
<4>[ 1291.844414] ? page_fault+0x8/0x30
<4>[ 1291.844418] page_fault+0x1e/0x30
<4>[ 1291.844420] RIP: 0033:0x7fd7eba54d96
<4>[ 1291.844423] Code: Bad RIP value.
<4>[ 1291.844425] RSP: 002b:00007fd7cc0b15d0 EFLAGS: 00010202
<4>[ 1291.844427] RAX: 00007fd7ecf5f100 RBX: 00007fd780019800 RCX:
0000000000000000
<4>[ 1291.844429] RDX: 00007fd78802bb28 RSI: 0000000000000000 RDI:
00007fd78802bb28
<4>[ 1291.844431] RBP: 00007fd7cc0b1650 R08: 0000000000000000 R09:
0000000000000080
<4>[ 1291.844433] R10: 00007fd7cc0b14b0 R11: 0000000000000206 R12:
00000000000003e8
<4>[ 1291.844436] R13: 00007fd7ec0e35ec R14: 0000000000000000 R15:
00007fd78801cef8
<3>[ 1291.844447] INFO: task java:2369 blocked for more than 61 seconds.
<3>[ 1291.844468] Tainted: G U W 5.2.0-rc2-CI-CI_DRM_6175+
#1
<3>[ 1291.844492] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
<6>[ 1291.844519] java D13880 2369 875 0x00000000
<4>[ 1291.844523] Call Trace:
<4>[ 1291.844528] ? __schedule+0x311/0x840
<4>[ 1291.844534] ? rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.844538] schedule+0x2e/0xb0
<4>[ 1291.844541] rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.844551] ? down_read+0x65/0xd0
<4>[ 1291.844553] down_read+0x65/0xd0
<4>[ 1291.844556] __do_page_fault+0x3d9/0x4f0
<4>[ 1291.844562] ? page_fault+0x8/0x30
<4>[ 1291.844565] page_fault+0x1e/0x30
<4>[ 1291.844568] RIP: 0033:0x7fd7eba54d96
<4>[ 1291.844571] Code: Bad RIP value.
<4>[ 1291.844573] RSP: 002b:00007fd7cc0785d0 EFLAGS: 00010202
<4>[ 1291.844575] RAX: 00007fd7ecf5f100 RBX: 00007fd7ac3b7800 RCX:
0000000000000000
<4>[ 1291.844577] RDX: 00007fd758008928 RSI: 0000000000000000 RDI:
00007fd758008928
<4>[ 1291.844579] RBP: 00007fd7cc078650 R08: 0000000000000000 R09:
0000000000000080
<4>[ 1291.844581] R10: 00007fd7cc0784b0 R11: 0000000000000206 R12:
00000000000003e8
<4>[ 1291.844583] R13: 00007fd7ec0e35ec R14: 0000000000000000 R15:
00007fd77c002958
<3>[ 1291.844594] INFO: task java:2871 blocked for more than 61 seconds.
<3>[ 1291.844616] Tainted: G U W 5.2.0-rc2-CI-CI_DRM_6175+
#1
<3>[ 1291.844639] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
<6>[ 1291.844666] java D13288 2871 875 0x00000000
<4>[ 1291.844670] Call Trace:
<4>[ 1291.844676] ? __schedule+0x311/0x840
<4>[ 1291.844681] ? rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.844686] schedule+0x2e/0xb0
<4>[ 1291.844688] rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.844698] ? down_read+0x65/0xd0
<4>[ 1291.844701] down_read+0x65/0xd0
<4>[ 1291.844704] __do_page_fault+0x3d9/0x4f0
<4>[ 1291.844709] ? page_fault+0x8/0x30
<4>[ 1291.844713] page_fault+0x1e/0x30
<4>[ 1291.844715] RIP: 0033:0x7fd7eb83fe1b
<4>[ 1291.844718] Code: Bad RIP value.
<4>[ 1291.844720] RSP: 002b:00007fd7c61aabe0 EFLAGS: 00010206
<4>[ 1291.844722] RAX: 00007fd754001000 RBX: 00007fd754001000 RCX:
0000000000000000
<4>[ 1291.844724] RDX: 00007fd754000ea0 RSI: 00007fd7ec0e35ec RDI:
0000000000000001
<4>[ 1291.844726] RBP: 00007fd7c61aac00 R08: 0000000000000001 R09:
0000000000000001
<4>[ 1291.844728] R10: 00007fd7ec0f8080 R11: 0000000000000246 R12:
0000000000000000
<4>[ 1291.844730] R13: 0000000000000000 R14: 00007fd7e4007380 R15:
00007fd7c61aace0
<3>[ 1291.844742] INFO: task java:4338 blocked for more than 61 seconds.
<3>[ 1291.844764] Tainted: G U W 5.2.0-rc2-CI-CI_DRM_6175+
#1
<3>[ 1291.844787] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
<6>[ 1291.844814] java D13704 4338 875 0x00000000
<4>[ 1291.844818] Call Trace:
<4>[ 1291.844824] ? __schedule+0x311/0x840
<4>[ 1291.844829] ? rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.844833] schedule+0x2e/0xb0
<4>[ 1291.844836] rwsem_down_read_failed+0xf7/0x1b0
<4>[ 1291.844846] ? down_read+0x65/0xd0
<4>[ 1291.844848] down_read+0x65/0xd0
<4>[ 1291.844851] __do_page_fault+0x3d9/0x4f0
<4>[ 1291.844857] ? page_fault+0x8/0x30
<4>[ 1291.844860] page_fault+0x1e/0x30
<4>[ 1291.844862] RIP: 0033:0x7fd7d50fab35
<4>[ 1291.844866] Code: Bad RIP value.
<4>[ 1291.844867] RSP: 002b:00007fd7c42733f8 EFLAGS: 00010283
<4>[ 1291.844870] RAX: 00000000d8ea5c38 RBX: 0000000000000100 RCX:
0000000000000010
<4>[ 1291.844872] RDX: 00000001000001f8 RSI: 0000000000000210 RDI:
00000000d8ea5e48
<4>[ 1291.844874] RBP: 00007fd7c42739d0 R08: 00000000d8df3368 R09:
00000000d8df32e8
<4>[ 1291.844876] R10: 0000000000000201 R11: 00007fd7e8be9000 R12:
0000000000000000
<4>[ 1291.844878] R13: 0000000000000070 R14: 0000000000000000 R15:
00007fd7c8006800
<4>[ 1291.844892]
Showing all locks held in the system:
<4>[ 1291.844896] 1 lock held by khungtaskd/33:
<4>[ 1291.844898] #0: 00000000b507bbcf (rcu_read_lock){....}, at:
debug_show_all_locks+0xe/0x1a0
<4>[ 1291.844906] 1 lock held by khugepaged/38:
<4>[ 1291.844907] #0: 0000000016ea4374 (&mm->mmap_sem#2){++++}, at:
khugepaged+0x156c/0x2560
<4>[ 1291.844916] 1 lock held by in:imklog/453:
<4>[ 1291.844919] 1 lock held by java/914:
<4>[ 1291.844921] #0: 0000000016ea4374 (&mm->mmap_sem#2){++++}, at:
__do_page_fault+0x3d9/0x4f0
<4>[ 1291.844927] 2 locks held by java/920:
<4>[ 1291.844929] 2 locks held by java/922:
<4>[ 1291.844931] 1 lock held by java/923:
<4>[ 1291.844933] #0: 0000000016ea4374 (&mm->mmap_sem#2){++++}, at:
__do_page_fault+0x3d9/0x4f0
<4>[ 1291.844938] 1 lock held by java/924:
<4>[ 1291.844940] #0: 0000000016ea4374 (&mm->mmap_sem#2){++++}, at:
__do_page_fault+0x3d9/0x4f0
<4>[ 1291.844945] 1 lock held by java/931:
<4>[ 1291.844947] #0: 0000000016ea4374 (&mm->mmap_sem#2){++++}, at:
__do_page_fault+0x3d9/0x4f0
<4>[ 1291.844952] 1 lock held by java/935:
<4>[ 1291.844954] #0: 0000000016ea4374 (&mm->mmap_sem#2){++++}, at:
__do_page_fault+0x3d9/0x4f0
<4>[ 1291.844959] 1 lock held by java/1679:
<4>[ 1291.844961] #0: 0000000016ea4374 (&mm->mmap_sem#2){++++}, at:
__do_page_fault+0x3d9/0x4f0
<4>[ 1291.844967] 1 lock held by java/2369:
<4>[ 1291.844968] #0: 0000000016ea4374 (&mm->mmap_sem#2){++++}, at:
__do_page_fault+0x3d9/0x4f0
<4>[ 1291.844974] 1 lock held by java/2871:
<4>[ 1291.844975] #0: 0000000016ea4374 (&mm->mmap_sem#2){++++}, at:
__do_page_fault+0x3d9/0x4f0
<4>[ 1291.844981] 1 lock held by java/4338:
<4>[ 1291.844983] #0: 0000000016ea4374 (&mm->mmap_sem#2){++++}, at:
__do_page_fault+0x3d9/0x4f0
<4>[ 1291.844989] 3 locks held by dmesg/4442:
<4>[ 1291.844992] 3 locks held by gem_linear_blit/4583:
<4>[ 1291.844993] #0: 00000000114dff66 (sb_writers#14){.+.+}, at:
vfs_write+0x18e/0x1b0
<4>[ 1291.844999] #1: 00000000dc208c9e (&attr->mutex){+.+.}, at:
simple_attr_write+0x36/0xd0
<4>[ 1291.845005] #2: 00000000e4d15450 (rcu_state.barrier_mutex){+.+.}, at:
rcu_barrier+0x23/0x190
<4>[ 1291.845012] =============================================
<6>[ 1294.633110] Console: switching to colour frame buffer device 240x67
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