<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [CI][BAT] igt* incomplete - /dev/kmsg buffer overrun, some messages lost" href="https://bugs.freedesktop.org/show_bug.cgi?id=103706#c19">Comment # 19</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [CI][BAT] igt* incomplete - /dev/kmsg buffer overrun, some messages lost" href="https://bugs.freedesktop.org/show_bug.cgi?id=103706">bug 103706</a> from <a class="email" href="mailto:marta.lofstedt@intel.com" title="Marta Löfstedt <marta.lofstedt@intel.com>"> Marta Löfstedt</a> <pre>I file this here because I still believe we need to trim the ftrace buffer so that we get "header" of the BUG_ON backtrace. I this case I believe it is probably <a class="bz_bug_link bz_status_NEW " title="NEW - [BAT][CI] Incomplete : kernel BUG at drivers/gpu/drm/i915/intel_lrc.c:880!" href="show_bug.cgi?id=102035">bug 102035</a>. However, since we also have <a class="bz_bug_link bz_status_NEW " title="NEW - [BAT] igt@kms_addfb_basic@invalid-set-prop - incomplete - kernel BUG at drivers/gpu/drm/i915/intel_lrc.c:886!" href="show_bug.cgi?id=103533">bug 103533</a>, I would need to objdump the actual kernel that was run in order to figure out which line it was. I don't know if decreasing the CONFIG_GLOBAL_TRACE_BUF_SIZE further will help. Maybe the ftrace will always write over the expected: "<4>[ 607.672089] ------------[ cut here ]------------ <2>[ 607.672099] kernel BUG at drivers/gpu/drm/i915/intel_lrc.c:891! <4>[ 607.672155] invalid opcode: 0000 [#1] PREEMPT SMP" <a href="https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3351/shard-apl2/igt@kms_chv_cursor_fail@pipe-c-128x128-bottom-edge.html">https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3351/shard-apl2/igt@kms_chv_cursor_fail@pipe-c-128x128-bottom-edge.html</a> <0>[ 327.861785] kms_chv_-2351 1..s1 327841533us : intel_lrc_irq_handler: rcs0 csb[0d]: status=0x00008002:0x00000003 <0>[ 327.861847] kms_chv_-2351 1..s1 327841534us : intel_lrc_irq_handler: rcs0 out[0]: ctx=3.1, seqno=19d37 <0>[ 327.861865] --------------------------------- <4>[ 327.861875] Modules linked in: vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic i915 x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_intel snd_hda_codec lpc_ich snd_hwdep r8169 mii snd_hda_core mei_me snd_pcm mei prime_numbers pinctrl_broxton pinctrl_intel <4>[ 327.861960] CPU: 1 PID: 2351 Comm: kms_chv_cursor_ Tainted: G U 4.14.0-CI-CI_DRM_3351+ #1 <4>[ 327.861977] Hardware name: /NUC6CAYB, BIOS AYAPLCEL.86A.0040.2017.0619.1722 06/19/2017 <4>[ 327.861995] task: ffff8802342ccec0 task.stack: ffffc900002b0000 <4>[ 327.862049] RIP: 0010:intel_lrc_irq_handler+0x40f/0xa00 [i915] <4>[ 327.862061] RSP: 0018:ffff88027fc83ef0 EFLAGS: 00010202 <4>[ 327.862073] RAX: 0000000000000005 RBX: 0000000000000000 RCX: 00000000000002b4 <4>[ 327.862086] RDX: 0000000000000004 RSI: ffff88027608f5b8 RDI: ffff88027608f4e8 <4>[ 327.862100] RBP: ffff88027fc83f58 R08: ffff8802761c3000 R09: 0000000000000002 <4>[ 327.862113] R10: 0000000000000000 R11: ffff8802703679c0 R12: ffff8802703679c0 <4>[ 327.862126] R13: ffff88027032d040 R14: ffff8802705f2158 R15: ffff8802705f2160 <4>[ 327.862140] FS: 00007f25fc1b9a40(0000) GS:ffff88027fc80000(0000) knlGS:0000000000000000 <4>[ 327.862155] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 327.862167] CR2: 00005598c236cc18 CR3: 000000023633a000 CR4: 00000000003406e0 <4>[ 327.862181] Call Trace: <4>[ 327.862190] <IRQ> <4>[ 327.862204] tasklet_hi_action+0x8e/0x110 <4>[ 327.862217] __do_softirq+0xc6/0x4af <4>[ 327.862228] do_softirq_own_stack+0x2a/0x40 <4>[ 327.862238] </IRQ> <4>[ 327.862282] ? __i915_add_request+0x1ee/0x460 [i915] <4>[ 327.862295] do_softirq.part.4+0x56/0x60 <4>[ 327.862306] __local_bh_enable_ip+0x8c/0xa0 <4>[ 327.862350] i915_gem_do_execbuffer+0xde4/0x1550 [i915] <4>[ 327.862371] ? lock_acquire+0xaf/0x200 <4>[ 327.862382] ? __might_fault+0x3e/0x90 <4>[ 327.862431] ? i915_gem_execbuffer+0x2b0/0x2b0 [i915] <4>[ 327.862476] i915_gem_execbuffer2+0x1d7/0x3c0 [i915] <4>[ 327.862488] ? __might_fault+0x3e/0x90 <4>[ 327.862532] ? i915_gem_execbuffer+0x2b0/0x2b0 [i915] <4>[ 327.862544] drm_ioctl_kernel+0x65/0xb0 <4>[ 327.862555] drm_ioctl+0x295/0x340 <4>[ 327.862598] ? i915_gem_execbuffer+0x2b0/0x2b0 [i915] <4>[ 327.862611] ? lock_acquire+0xaf/0x200 <4>[ 327.862622] ? task_work_run+0x7b/0xc0 <4>[ 327.862634] do_vfs_ioctl+0x8f/0x670 <4>[ 327.862644] ? entry_SYSCALL_64_fastpath+0x5/0xb1 <4>[ 327.862655] ? trace_hardirqs_on_caller+0xde/0x1c0 <4>[ 327.862667] SyS_ioctl+0x3b/0x70 <4>[ 327.862678] entry_SYSCALL_64_fastpath+0x1c/0xb1 <4>[ 327.862689] RIP: 0033:0x7f25fa3b8587 <4>[ 327.862697] RSP: 002b:00007ffc179775e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 <4>[ 327.862713] RAX: ffffffffffffffda RBX: ffffc900002b3ff0 RCX: 00007f25fa3b8587 <4>[ 327.862726] RDX: 00007ffc17977680 RSI: 0000000040406469 RDI: 0000000000000004 <4>[ 327.862739] RBP: 000000000000003c R08: 0000000000000008 R09: 0000000000000000 <4>[ 327.862752] R10: 0000000000000073 R11: 0000000000000246 R12: 0000000000000046 <4>[ 327.862766] R13: 00007f25fa67cc20 R14: 0000000000000000 R15: 0000000000000000 <4>[ 327.862782] Code: e9 d8 fc ff ff 41 8b 46 24 44 8d a8 70 03 00 00 48 8b 45 c0 4c 03 a8 b8 0b 00 00 41 c7 86 9c 03 00 00 ff ff ff ff e9 80 fc ff ff <0f> 0b 0f 0b 0f 0b 49 8b 86 80 03 00 00 4d 89 f7 a8 02 74 20 41 <1>[ 327.862934] RIP: intel_lrc_irq_handler+0x40f/0xa00 [i915] RSP: ffff88027fc83ef0 <7>[ 327.863162] [drm:gen8_irq_handler [i915]] hotplug event received, stat 0x00000020, dig 0x10001918, pins 0x00000040 <7>[ 327.863268] [drm:intel_hpd_irq_handler [i915]] digital hpd port C - short <7>[ 327.863374] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port C - short <7>[ 327.863436] [drm:intel_power_well_enable [i915]] enabling always-on <7>[ 327.863486] [drm:intel_power_well_enable [i915]] enabling DC off <7>[ 327.863839] [drm:gen9_set_dc_state [i915]] Setting DC state from 01 to 00 <4>[ 327.863843] ---[ end trace e93b116545516f76 ]---</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>