<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [bsw] execlists causes machine lockups" href="https://bugs.freedesktop.org/show_bug.cgi?id=93467#c12">Comment # 12</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - [bsw] execlists causes machine lockups" href="https://bugs.freedesktop.org/show_bug.cgi?id=93467">bug 93467</a> from <a class="email" href="mailto:tvrtko.ursulin@linux.intel.com" title="Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>"> Tvrtko Ursulin</a> <pre>I can repro a similar hang on BDW i7-5xxxU: [ 181.115096] gem_exec_nop: starting subtest basic [ 224.975059] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:0] [ 224.983398] Modules linked in: asix usbnet hid_generic libphy usbhid mii coretemp lpc_ich i915 i2c_algo_bit drm_kms_helper cfbfillrect i2c_hid syscopyarea cfbimgblt hid sysfillrect sysimgblt fb_sys_fops cfbcopyarea video gpio_lynxpoint drm acpi_pad nls_iso8859_1 e1000e ahci ptp libahci pps_core [ 225.013417] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G U 4.5.0-rc5-160225+ #174 [ 225.022818] Hardware name: Intel Corporation Broadwell Client platform/WhiteTip Mountain 1, BIOS BDW-E1R1.86C.0080.R01.1406120446 06/12/2014 [ 225.037168] task: ffffffff81a0f4c0 ti: ffffffff81a00000 task.ti: ffffffff81a00000 [ 225.045690] RIP: 0010:[<ffffffff81053690>] [<ffffffff81053690>] __do_softirq+0x70/0x2a0 [ 225.054915] RSP: 0018:ffff88014f403f30 EFLAGS: 00000206 [ 225.060963] RAX: 00000000ffffffff RBX: 0000000000000000 RCX: 0000000000200000 [ 225.069097] RDX: 0000000000000072 RSI: ffff88014f40c600 RDI: 00000000740909e0 [ 225.077240] RBP: ffff88014f403f80 R08: 0000002e972ffc40 R09: 0000000000000403 [ 225.085359] R10: 0000000000000004 R11: 0000000000000005 R12: 0000000000000008 [ 225.093471] R13: 0000000000000000 R14: ffffffff81a7dbe0 R15: 0000002e5b867c93 [ 225.101587] FS: 0000000000000000(0000) GS:ffff88014f400000(0000) knlGS:0000000000000000 [ 225.110797] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 225.117336] CR2: 00007f0eb4c959d8 CR3: 0000000002a0a000 CR4: 00000000003406f0 [ 225.125469] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 225.133585] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 225.141730] Stack: [ 225.144018] ffffffff81a04000 0000000a00200000 00000000fffe7655 0000002e972ffc40 [ 225.152488] ffff880100000082 0000000000000000 0000000000000008 0000000000000000 [ 225.160980] ffffffff81a7dbe0 0000002e5b867c93 ffff88014f403f90 ffffffff81053ab6 [ 225.169485] Call Trace: [ 225.172278] <IRQ> [ 225.174480] [<ffffffff81053ab6>] irq_exit+0x86/0x90 [ 225.180333] [<ffffffff8103857d>] smp_apic_timer_interrupt+0x3d/0x50 [ 225.187579] [<ffffffff8156e96f>] apic_timer_interrupt+0x7f/0x90 [ 225.194431] <EOI> [ 225.196629] [<ffffffff814a50e3>] ? cpuidle_enter_state+0xd3/0x2e0 [ 225.203875] [<ffffffff814a5312>] cpuidle_enter+0x12/0x20 [ 225.210049] [<ffffffff81084a21>] cpu_startup_entry+0x2f1/0x340 [ 225.216794] [<ffffffff815686df>] rest_init+0x7f/0x90 [ 225.222538] [<ffffffff81afb023>] start_kernel+0x470/0x47d [ 225.228765] [<ffffffff81afa9a1>] ? set_init_arg+0x55/0x55 [ 225.235042] [<ffffffff81afa5ad>] x86_64_start_reservations+0x2a/0x2c [ 225.242410] [<ffffffff81afa699>] x86_64_start_kernel+0xea/0xed [ 225.249155] Code: 89 4d b8 89 45 d0 65 48 8b 04 25 c4 23 01 00 c7 45 bc 0a 00 00 00 48 89 45 b0 65 c7 05 b6 ec fb 7e 00 00 00 00 fb b8 ff ff ff ff <49> c7 c4 c0 90 a0 81 0f bc 45 d0 83 c0 01 89 45 d4 74 7d 48 63 I went back to a nightly kernel from 25th of February just to eliminate possible recent regressions. Downside is that BDW has no potential endless loop in the irq handler so it must be something else.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>