igt@perf_pmu@cpu-hotplug - dmesg-warn - SUCCESS , INFO: task igt_runner:1206 blocked for more than 30 seconds.
https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_455/fi-snb-2520m/igt@perf_pmu@cpu-hotplug.html#dmesg-warnings1221
6> [115.529504] Console: switching to colour dummy device 80x25
<6> [115.529571] [IGT] perf_pmu: executing
<6> [115.861073] [IGT] perf_pmu: starting subtest cpu-hotplug
<6> [115.964000] smpboot: CPU 0 is now offline
<6> [116.972288] smpboot: Booting Node 0 Processor 0 APIC 0x0
<6> [116.972539] Disabled fast string operations
<6> [117.078458] smpboot: CPU 1 is now offline
<6> [118.085149] x86: Booting SMP configuration:
<6> [118.085154] smpboot: Booting Node 0 Processor 1 APIC 0x1
<6> [118.085377] Disabled fast string operations
<6> [118.122390] smpboot: CPU 2 is now offline
<6> [119.129141] smpboot: Booting Node 0 Processor 2 APIC 0x2
<6> [119.129354] Disabled fast string operations
<6> [119.167508] smpboot: CPU 3 is now offline
<6> [120.174153] smpboot: Booting Node 0 Processor 3 APIC 0x3
<6> [120.174382] Disabled fast string operations
<6> [120.384906] [IGT] perf_pmu: exiting, ret=0
<5> [120.385583] Setting dangerous option reset - tainting kernel
<5> [120.386528] Setting dangerous option reset - tainting kernel
<6> [120.388521] Console: switching to colour frame buffer device 170x48
<7> [120.401137] i915 0000:00:02.0: [drm:intel_fbc_enable [i915]] reserved 8454144 bytes of contiguous stolen space for FBC, threshold: 1
<7> [120.401191] i915 0000:00:02.0: [drm:intel_fbc_enable [i915]] Enabling FBC on pipe A
<7> [120.403126] i915 0000:00:02.0: [drm:__intel_fbc_disable [i915]] Disabling FBC on pipe A
<3> [151.987595] INFO: task igt_runner:1206 blocked for more than 30 seconds.
<3> [151.988542] Tainted: G U W 5.6.0-rc6-gb51a7e7f4f72-drmtip_455+ #1
<3> [151.988717] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
<6> [151.988890] igt_runner D12600 1206 1202 0x00000000
<4> [151.988908] Call Trace:
<4> [151.988939] ? __schedule+0x2e5/0x810
<4> [151.988955] ? wait_on_page_bit+0x12f/0x2c0
<4> [151.989067] schedule+0x37/0xe0
<4> [151.989082] io_schedule+0xd/0x30
<4> [151.989098] wait_on_page_bit+0x13a/0x2c0
<4> [151.989128] ? file_fdatawait_range+0x20/0x20
<4> [151.989166] __filemap_fdatawait_range+0x8f/0x140
<4> [151.989197] ? __filemap_fdatawrite_range+0xc6/0x100
<4> [151.989211] ? __filemap_fdatawrite_range+0xd4/0x100
<4> [151.989262] file_write_and_wait_range+0x66/0x90
<4> [151.989295] ext4_sync_file+0x1a4/0x4e0
<4> [151.989318] do_fsync+0x33/0x60
<4> [151.989334] __x64_sys_fdatasync+0xe/0x20
<4> [151.989344] do_syscall_64+0x4f/0x240
<4> [151.989357] entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [151.989366] RIP: 0033:0x7fbec94702c4
<4> [151.989382] Code: Bad RIP value.
<4> [151.989389] RSP: 002b:00007fffc9a4f838 EFLAGS: 00000246 ORIG_RAX: 000000000000004b
<4> [151.989399] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbec94702c4
<4> [151.989405] RDX: 000000000000001e RSI: 00007fffc9a4fe30 RDI: 0000000000000009
<4> [151.989412] RBP: 00007fffc9a4f910 R08: 0000000000022f76 R09: 0000000000000072
<4> [151.989418] R10: 000000002e55e9c0 R11: 0000000000000246 R12: 0000000000000006
<4> [151.989425] R13: 000000000000000c R14: 00007fffc9a4fe30 R15: 000000000000000e
<4> [151.989468]
Showing all locks held in the system: