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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI] igt@* - incomplete - Softdog on gvtdvm machines, pi_lock lockdep in boot.log"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105600#c17">Comment # 17</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI] igt@* - incomplete - Softdog on gvtdvm machines, pi_lock lockdep in boot.log"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105600">bug 105600</a>
from <span class="vcard"><a class="email" href="mailto:daniel@ffwll.ch" title="Daniel Vetter <daniel@ffwll.ch>"> <span class="fn">Daniel Vetter</span></a>
</span></b>
<pre>New hit, now with the ODEBUG backtraced patch:
<a href="https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_8/fi-skl-gvtdvm/igt@gem_exec_schedule@reorder-wide-render.html">https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_8/fi-skl-gvtdvm/igt@gem_exec_schedule@reorder-wide-render.html</a>
Relevant bits of dmesg (without the lockdep splat, which is secondary):
<4>[ 10.850889] WARNING: CPU: 0 PID: 194 at lib/debugobjects.c:301
debug_print_object+0xac/0xe0
<4>[ 10.851698] ---[ end trace 229b22432d4ca3d7 ]---
<3>[ 10.852134] ODEBUG: ODEBUG: debug object originally initialized at:
<4>[ 10.852640] futex_wait+0x69/0x220
<4>[ 10.853059] do_futex+0x482/0xb00
<4>[ 10.853475] SyS_futex+0x118/0x150
<4>[ 10.853935] do_syscall_64+0x6b/0x1b0
<4>[ 10.854358] entry_SYSCALL_64_after_hwframe+0x42/0xb7
Blowing up at
<4>[ 10.854893] debug_print_object+0xac/0xe0
<4>[ 10.854893] ? __schedule+0x2a6/0xbb0
<4>[ 10.854894] ? lock_acquire+0xa6/0x210
<4>[ 10.854894] ? debug_check_no_obj_freed+0xac/0x220
<4>[ 10.854894] debug_check_no_obj_freed+0x1e6/0x220
<4>[ 10.854895] __vunmap+0xab/0x100
<4>[ 10.854895] load_module+0x2388/0x2ac0
<4>[ 10.854895] ? SyS_finit_module+0xb8/0xd0
<4>[ 10.854896] SyS_finit_module+0xb8/0xd0
<4>[ 10.854896] do_syscall_64+0x6b/0x1b0
<4>[ 10.854896] entry_SYSCALL_64_after_hwframe+0x42/0xb7
Followed shortly by an Oops:
<1>[ 13.299232] BUG: unable to handle kernel NULL pointer dereference at
0000000000000006
<1>[ 13.299238] IP: do_raw_spin_lock+0x1/0xb0
<6>[ 13.299239] PGD 0 P4D 0
<4>[ 13.299241] Oops: 0000 [#1] PREEMPT SMP PTI
<4>[ 13.299243] Modules linked in: i915(+) crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel e1000(+) i2c_piix4 prime_numbers
<4>[ 13.299251] CPU: 0 PID: 194 Comm: systemd-udevd Tainted: G W
4.16.0-rc7-g0539b52e05cd-drmtip_8+ #1
<4>[ 13.299264] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.10.1-0-g8891697-prebuilt.qemu-project.org 04/01/2014
<4>[ 13.299266] RIP: 0010:do_raw_spin_lock+0x1/0xb0
<4>[ 13.299267] RSP: 0018:ffffbbf980257c58 EFLAGS: 00010086
<4>[ 13.299268] RAX: ffffa3833ac6d040 RBX: 0000000000000002 RCX:
0000000000000000
<4>[ 13.299269] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000000000002
<4>[ 13.299270] RBP: 0000000000000287 R08: 0000000000000001 R09:
ffffffff9010c09f
<4>[ 13.299271] R10: ffffbbf980257c00 R11: 0000000000000000 R12:
ffffbbf980257ca8
<4>[ 13.299271] R13: 0000000000000003 R14: ffffffff9273da68 R15:
ffffffff91249cc0
<4>[ 13.299275] FS: 00007fbecbb66480(0000) GS:ffffa3833fc00000(0000)
knlGS:0000000000000000
<4>[ 13.299276] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[ 13.299276] CR2: 0000000000000006 CR3: 0000000077bc8002 CR4:
00000000003606f0
<4>[ 13.299277] Call Trace:
<4>[ 13.299281] _raw_spin_lock_irqsave+0x3b/0x50
<4>[ 13.299283] ? lock_hrtimer_base.isra.2+0x1f/0x40
<4>[ 13.299285] lock_hrtimer_base.isra.2+0x1f/0x40
<4>[ 13.299286] hrtimer_try_to_cancel+0x36/0x1d0
<4>[ 13.299288] hrtimer_fixup_free+0x15/0x40
<4>[ 13.299290] debug_object_fixup+0x12/0x30
<4>[ 13.299292] debug_check_no_obj_freed+0x212/0x220
<4>[ 13.299295] __vunmap+0xab/0x100
<4>[ 13.299298] load_module+0x2388/0x2ac0
<4>[ 13.299303] ? SyS_finit_module+0xb8/0xd0
<4>[ 13.299305] SyS_finit_module+0xb8/0xd0
<4>[ 13.299309] do_syscall_64+0x6b/0x1b0
<4>[ 13.299312] entry_SYSCALL_64_after_hwframe+0x42/0xb7
I hope I pasted the right bits togethere, the ODEBUG, OOps and lockdep splat
are all a bit interleaved.</pre>
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