[Bug 65880] [HSW bisected] igt/module_reload randomly causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65880

Daniel Vetter <daniel at ffwll.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gordon.jin at intel.com,
                   |                            |yi.sun at intel.com

--- Comment #4 from Daniel Vetter <daniel at ffwll.ch> ---
Quick note on bug filing BKMs:

When pasting a backtrace always paste the first backtrace, not the last one
like here. Usually later backtraces are just follow-up fallout. So in this case
the right paste would be


[  168.675293] IP: [<ffffffffa007751c>] ivb_can_enable_err_int+0x20/0x33 [i915]
[  168.675306] PGD 0 
[  168.675308] Oops: 0000 [#1] SMP 
[  168.675309] Modules linked in: i915(+) drm_kms_helper drm netconsole
configfs ipv6 dm_mod acpi_cpufreq coretemp kvm_intel kvm snd_hda_codec_realtek
microcode pcspkr i2c_i801 iTCO_wdt iTCO_vendor_support snd_hda_intel lpc_ich
snd_hda_codec mfd_core snd_hwdep snd_pcm snd_page_alloc snd_timer snd soundcore
video button mperf freq_table [last unloaded: drm]
[  168.675321] CPU: 0 PID: 0 Comm: swapper/0 Not tainted
3.10.0-rc5_nightlytop_c18149_20130618_+ #4155
[  168.675322] Hardware name: Intel Corporation Shark Bay Client
platform/Flathead Creek Crb, BIOS HSWLPTU1.86C.0109.R03.1301282055 01/28/2013
[  168.675323] task: ffffffff81a58410 ti: ffffffff81a48000 task.ti:
ffffffff81a48000
[  168.675324] RIP: 0010:[<ffffffffa007751c>]  [<ffffffffa007751c>]
ivb_can_enable_err_int+0x20/0x33 [i915]
[  168.675334] RSP: 0018:ffff88024e203ea0  EFLAGS: 00010002
[  168.675335] RAX: 0000000000000001 RBX: ffff88023e118000 RCX:
0000000000000003
[  168.675336] RDX: ffff88023e118000 RSI: 0000000000000000 RDI:
ffff880243ed5800
[  168.675336] RBP: ffff880243ed5800 R08: ffffffff816f42f0 R09:
000000000000b5a1
[  168.675337] R10: 00000000000000f6 R11: 00000000000000f6 R12:
0000000000000010
[  168.675337] R13: 0000000000000001 R14: 00000000ffffffff R15:
0000000000000002
[  168.675338] FS:  0000000000000000(0000) GS:ffff88024e200000(0000)
knlGS:0000000000000000
[  168.675339] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  168.675340] CR2: 0000000000000920 CR3: 000000024316f000 CR4:
00000000001407f0
[  168.675341] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[  168.675341] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[  168.675341] Stack:
[  168.675342]  ffffffffa007ccde 000000000000012c f400252900000040
ffff88024e212150
[  168.675343]  ffff88023f137c00 ffff88023f3a0500 000000000000002b
0000000000000000
[  168.675345]  0000000000000000 000000000000f000 ffffffff81082bbb
ffff880245400000
[  168.675346] Call Trace:
[  168.675347]  <IRQ>  [<ffffffffa007ccde>] ? ivybridge_irq_handler+0x429/0x491
[i915]
[  168.675358]  [<ffffffff81082bbb>] ? handle_irq_event_percpu+0x24/0x119
[  168.675362]  [<ffffffff81082cde>] ? handle_irq_event+0x2e/0x4c
[  168.675364]  [<ffffffff81085019>] ? handle_edge_irq+0xbb/0xde
[  168.675366]  [<ffffffff810038c1>] ? handle_irq+0x15/0x1d
[  168.675368]  [<ffffffff810035bd>] ? do_IRQ+0x41/0xa6
[  168.675370]  [<ffffffff816e3a2a>] ? common_interrupt+0x6a/0x6a
[  168.675372]  <EOI>  [<ffffffff815ff34c>] ? cpuidle_enter_state+0x43/0xa6
[  168.675376]  [<ffffffff815ff345>] ? cpuidle_enter_state+0x3c/0xa6
[  168.675377]  [<ffffffff815ff46e>] ? cpuidle_idle_call+0xbf/0x10b
[  168.675378]  [<ffffffff810085cb>] ? arch_cpu_idle+0x6/0x17
[  168.675380]  [<ffffffff8105dd7c>] ? cpu_startup_entry+0xa1/0xfd
[  168.675382]  [<ffffffff81b08c6a>] ? start_kernel+0x378/0x383
[  168.675384]  [<ffffffff81b08708>] ? repair_env_string+0x57/0x57
[  168.675386] Code: 05 e1 b8 01 00 00 00 c3 0f 1f 00 48 8b 97 30 03 00 00 48
8b 42 10 8a 48 04 31 c0 83 e1 07 eb 14 48 8b b4 c2 d8 22 00 00 48 ff c0 <80> be
20 09 00 00 00 75 07 39 c1 77 e8 b0 01 c3 31 c0 c3 8b 97 
[  168.675404] RIP  [<ffffffffa007751c>] ivb_can_enable_err_int+0x20/0x33
[i915]
[  168.675413]  RSP <ffff88024e203ea0>
[  168.675414] CR2: 0000000000000920
[  168.675415] ---[ end trace 51d2d549a433189e ]---
[  168.675416] Kernel panic - not syncing: Fatal exception in interrupt


Although in this case it looks a bit like 2 backtraces are a bit interleaved,
so a more complicated situation. CC'ing Sun Yi and Gordon Jin to take note of
this BKM.

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