[Bug 103706] [CI][BAT] igt* incomplete - /dev/kmsg buffer overrun, some messages lost

Tue Nov 14 07:55:24 UTC 2017

https://bugs.freedesktop.org/show_bug.cgi?id=103706

--- Comment #13 from Marta Löfstedt <marta.lofstedt at intel.com> ---
https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_492/fi-bxt-j4205/igt@vgem_basic@dmabuf-export.html

dmesg:
<7>[  473.265673] [IGT] vgem_basic: starting subtest debugfs
<4>[  473.266084] INFO: trying to register non-static key.
<4>[  473.266097] the code is fine but needs lockdep annotation.
<4>[  473.266103] turning off the locking correctness validator.
then ftrace spamming:
 <0>[  473.266614] Dumping ftrace buffer:
<0>[  473.266661] ---------------------------------
<0>[  473.266848] CPU:1 [LOST 153991 EVENTS]
                     <...>-3366    1..s1 325544570us : intel_lrc_irq_handler:
vecs0 in[0]:  ctx=2.1, seqno=1adce
...
<0>[  486.328080]   <idle>-0       2..s1 472520536us : intel_lrc_irq_handler:
vecs0 out[0]: ctx=3.1, seqno=23667

the the backtraces:
<4>[  486.328666] Call Trace:
<4>[  486.328683]  ? drm_mode_gamma_get_ioctl+0xf0/0xf0

<3>[  486.617585] BUG: sleeping function called from invalid context at
./include/linux/percpu-rwsem.h:34

<5>[  486.623297] systemd-journald[195]: /dev/kmsg buffer overrun, some
messages lost.
<1>[  486.627944] BUG: unable to handle kernel paging request at
fffffffeecf32030

<3>[  486.633071] BUG: scheduling while atomic: kworker/2:2/205/0x00000003
<4>[  486.633091] INFO: lockdep is turned off.

<4>[  486.633310] WARNING: CPU: 2 PID: 205 at kernel/rcu/tree_plugin.h:329
rcu_note_context_switch+0x70/0x6c0

<7>[  487.001473] [IGT] vgem_basic: executing
<7>[  487.030825] [IGT] vgem_basic: starting subtest dmabuf-export
<3>[  551.597068] INFO: rcu_preempt detected stalls on CPUs/tasks:
<3>[  551.597121]       Tasks blocked on level-0 rcu_node (CPUs 0-3): P205
<3>[  551.597164]       (detected by 2, t=65002 jiffies, g=32449, c=32448,
q=28149)

Note pstore only has the first stuff:
https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_492/fi-bxt-j4205/dmesg-1510488286_Oops_1.log
<0>[  486.328080]   <idle>-0       2..s1 472520536us : intel_lrc_irq_handler:
vecs0 out[0]: ctx=3.1, seqno=23667
<0>[  486.328117] ---------------------------------
<4>[  486.328138] Modules linked in: vgem snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic i915 x86_pkg_temp_thermal
intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
snd_hda_intel snd_hda_codec snd_hwdep lpc_ich snd_hda_core snd_pcm r8169 mii
mei_me prime_numbers mei i2c_hid pinctrl_broxton pinctrl_intel
<4>[  486.328309] CPU: 2 PID: 4341 Comm: vgem_basic Tainted: G     U         
4.14.0-rc8-CI-CI_DRM_3335+ #1
<4>[  486.328343] Hardware name: To Be Filled By O.E.M. To Be Filled By
O.E.M./J4205-ITX, BIOS P1.10 09/29/2016
<4>[  486.328379] task: ffff88026b45a780 task.stack: ffffc9000112c000
<4>[  486.328408] RIP: 0010:drm_framebuffer_info+0x77/0xc0
<4>[  486.328428] RSP: 0018:ffffc9000112fd68 EFLAGS: 00010286
<4>[  486.328453] RAX: 0000000000000000 RBX: fffffffffffffff8 RCX:
0000000000000001
<4>[  486.328479] RDX: 0000000080000001 RSI: 0000000000000000 RDI:
00000000ffffffff
<4>[  486.328506] RBP: ffffc9000112fda0 R08: 0000000000000000 R09:
0000000000000000
<4>[  486.328532] R10: ffffc9000112fd58 R11: ffffffff81607ef8 R12:
ffff8801fd432950
<4>[  486.328559] R13: ffff8801fd4328c8 R14: ffffffff81ce969b R15:
ffff88026674e2b8
<4>[  486.328586] FS:  00007fa4579e08c0(0000) GS:ffff88027fd00000(0000)
knlGS:0000000000000000
<4>[  486.328617] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[  486.328640] CR2: 0000000000000010 CR3: 00000002649e3000 CR4:
00000000003406e0
<4>[  486.328666] Call Trace:
<4>[  486.328683]  ? drm_mode_gamma_get_ioctl+0xf0/0xf0
<4>[  486.328709]  seq_read+0xe1/0x3a0
<4>[  486.328732]  full_proxy_read+0x54/0x80
<4>[  486.328753]  __vfs_read+0x28/0x120
<4>[  486.328772]  ? putname+0x54/0x60
<4>[  486.328791]  ? rcu_read_lock_sched_held+0x7a/0x90
<4>[  486.328814]  ? entry_SYSCALL_64_fastpath+0x5/0xb1
<4>[  486.328836]  vfs_read+0xa8/0x150
<4>[  486.328855]  SyS_read+0x49/0xb0
<4>[  486.328873]  entry_SYSCALL_64_fastpath+0x1c/0xb1
<4>[  486.328894] RIP: 0033:0x7fa4561c1500
<4>[  486.328910] RSP: 002b:00007ffe7ac3d1b8 EFLAGS: 00000246 ORIG_RAX:
0000000000000000
<4>[  486.328942] RAX: ffffffffffffffda RBX: ffffffff81492083 RCX:
00007fa4561c1500
<4>[  486.328968] RDX: 000000000000003f RSI: 000055869cdacc50 RDI:
0000000000000005
<4>[  486.328995] RBP: ffffc9000112ff88 R08: 0000000000000000 R09:
0000000000000000
<4>[  486.329021] R10: 0000000000000000 R11: 0000000000000246 R12:
0000000000000005
<4>[  486.329047] R13: 000055869cdacc50 R14: 0000000000000000 R15:
0000000000000000
<4>[  486.329078]  ? __this_cpu_preempt_check+0x13/0x20
<4>[  486.329102] Code: 20 06 00 00 48 a9 f8 ff ff ff 74 63 49 8b 84 24 a8 06
00 00 49 81 c4 a8 06 00 00 49 c7 c6 9b 96 ce 81 49 39 c4 48 8d 58 f8 74 2d <8b>
53 18 48 8d 7d c8 4c 89 f6 e8 4a 5c 00 00 48 8d 7d c8 48 89 
<1>[  486.329327] RIP: drm_framebuffer_info+0x77/0xc0 RSP: ffffc9000112fd68
<4>[  486.329351] CR2: 0000000000000010
<4>[  486.329370] ---[ end trace c108931ffc3d15ee ]---

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