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Date:   Sun, 26 Nov 2017 10:37:38 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     Davidlohr Bueso <dbueso@...e.de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        LKML <linux-kernel@...r.kernel.org>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        lkp@...org
Subject: [lib/rbtree,drm/mm]  653c9f9a4d: BUG:kernel_hang_in_boot_stage

FYI, we noticed the following commit (built with gcc-5):

commit: 653c9f9a4dd8037ffc5afbb1040d15566aa8f533 ("lib/rbtree,drm/mm: Add rbtree_replace_node_cached()")
git://anongit.freedesktop.org/drm-intel topic/core-for-CI

in testcase: boot

on test machine: qemu-system-i386 -enable-kvm -smp 2 -m 320M

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):

+------------------------------------------------+------------+------------+
|                                                | 70c1cedd5c | 653c9f9a4d |
+------------------------------------------------+------------+------------+
| boot_successes                                 | 0          | 0          |
| boot_failures                                  | 8          | 8          |
| genirq:Flags_mismatch_irq##(ttyS0)vs.#(sir_ir) | 7          | 4          |
| BUG:soft_lockup-CPU##stuck_for#s               | 1          |            |
| EIP:insert_augmented                           | 1          |            |
| Kernel_panic-not_syncing:softlockup:hung_tasks | 1          |            |
| BUG:kernel_hang_in_boot_stage                  | 0          | 4          |
+------------------------------------------------+------------+------------+


         [   77.806701] Linux agpgart interface v0.103
         [   77.825237] Hangcheck: starting hangcheck timer 0.9.1 (tick is 180 seconds, margin is 60 seconds).
         [   77.860502] drm_mm: Testing DRM range manger (struct drm_mm), with random_seed=0xbac20086 max_iterations=8192 max_prime=128
         [   77.898934] drm_mm: igt_sanitycheck - ok!
         [  328.297497] kworker/dying (33) used greatest stack depth: 7396 bytes left
         BUG: kernel hang in boot stage

         Elapsed time: 440

To reproduce:

         git clone https://github.com/intel/lkp-tests.git
         cd lkp-tests
         bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email

Thanks,
Fengguang

View attachment "config-4.14.0-00006-g653c9f9" of type "text/plain" (104161 bytes)

View attachment "job-script" of type "text/plain" (4099 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (9572 bytes)

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