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When marking the debugobject as freed, be sure that write is flushed before another CPU may see it on a reallocation path. Only seen once in CI: [ 159.240873] WARNING: CPU: 3 PID: 6735 at lib/debugobjects.c:263 debug_print_object+0x87/0xb0 [ 159.240897] ODEBUG: init destroyed (active state 0) object type: i915_sw_fence hint: submit_notify+0x0/0x4c [i915] [ 159.240902] Modules linked in: snd_hda_intel i915 x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul snd_hda_codec_realtek crc32_pclmul snd_hda_codec_generic snd_hda_codec_hdmi ghash_clmulni_intel snd_hda_codec snd_hwdep snd_hda_core snd_pcm mei_me lpc_ich mei e1000e ptp pps_core [last unloaded: i915] [ 159.240913] CPU: 3 PID: 6735 Comm: gem_exec_nop Tainted: G U 4.10.0-rc3-CI-Trybot_479+ #1 [ 159.240913] Hardware name: LENOVO 10AGS00601/SHARKBAY, BIOS FBKT34AUS 04/24/2013 [ 159.240914] Call Trace: [ 159.240916] dump_stack+0x67/0x92 [ 159.240919] __warn+0xc6/0xe0 [ 159.240920] warn_slowpath_fmt+0x4a/0x50 [ 159.240921] debug_print_object+0x87/0xb0 [ 159.240935] ? __i915_request_wait_for_execute+0x1d0/0x1d0 [i915] [ 159.240936] __debug_object_init+0xb2/0x410 [ 159.240950] ? __i915_request_wait_for_execute+0x1d0/0x1d0 [i915] [ 159.240951] debug_object_init+0x16/0x20 [ 159.240962] __i915_sw_fence_init+0x29/0x60 [i915] [ 159.240975] i915_gem_request_alloc+0x1fb/0x450 [i915] [ 159.240987] i915_gem_do_execbuffer.isra.15+0x798/0x1b20 [i915] [ 159.241000] i915_gem_execbuffer2+0xc0/0x250 [i915] [ 159.241003] drm_ioctl+0x200/0x450 [ 159.241016] ? i915_gem_execbuffer+0x330/0x330 [i915] [ 159.241018] do_vfs_ioctl+0x90/0x6e0 [ 159.241020] ? trace_hardirqs_on_caller+0x122/0x1b0 [ 159.241021] SyS_ioctl+0x3c/0x70 [ 159.241023] entry_SYSCALL_64_fastpath+0x1c/0xb1 [ 159.241024] RIP: 0033:0x7f9bc4f41357 [ 159.241025] RSP: 002b:00007ffc6cd5c568 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 159.241026] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9bc4f41357 [ 159.241026] RDX: 00007ffc6cd5c640 RSI: 0000000040406469 RDI: 0000000000000003 [ 159.241027] RBP: 00007ffc6cd5c640 R08: 0000000000047508 R09: 0000000000000001 [ 159.241027] R10: 000b58552d323c3d R11: 0000000000000246 R12: 0000000040406469 [ 159.241028] R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000001 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170113214335.5829-1-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.