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The xarray pointer which has the userqueue xarray structure reference should be cleared when the userqueue gets destroyed. Otherwise, we may access the freed xa memory and see the below warnings. warning 1: BUG: KASAN: slab-use-after-free in _raw_spin_lock+0x7a/0xe0 [ +0.000044] Call Trace: [ +0.000017] <TASK> [ +0.000016] dump_stack_lvl+0x6c/0x90 [ +0.000025] print_report+0xc4/0x5e0 [ +0.000025] ? srso_return_thunk+0x5/0x5f [ +0.000024] ? kasan_complete_mode_report_info+0x60/0x1d0 [ +0.000030] ? _raw_spin_lock+0x7a/0xe0 [ +0.000023] kasan_report+0xdf/0x120 [ +0.000023] ? _raw_spin_lock+0x7a/0xe0 [ +0.000025] kasan_check_range+0xf7/0x1b0 [ +0.000025] __kasan_check_write+0x14/0x20 [ +0.000024] _raw_spin_lock+0x7a/0xe0 [ +0.000023] ? __pfx__raw_spin_lock+0x10/0x10 [ +0.000024] ? amdgpu_userq_wait_ioctl+0xac0/0x1f30 [amdgpu] [ +0.000442] amdgpu_userq_wait_ioctl+0x18fc/0x1f30 [amdgpu] [ +0.000428] ? __pfx_amdgpu_userq_wait_ioctl+0x10/0x10 [amdgpu] [ +0.000424] ? __pfx_idr_alloc_u32+0x10/0x10 [ +0.000027] ? srso_return_thunk+0x5/0x5f [ +0.000024] ? __kasan_check_write+0x14/0x20 [ +0.000025] ? srso_return_thunk+0x5/0x5f [ +0.000024] ? idr_alloc+0x72/0xc0 [ +0.000023] ? srso_return_thunk+0x5/0x5f [ +0.000023] ? fput+0x1c/0x2f0 [ +0.000025] drm_ioctl_kernel+0x178/0x2f0 [drm] [ +0.000065] ? __pfx_amdgpu_userq_wait_ioctl+0x10/0x10 [amdgpu] [ +0.000425] ? __pfx_drm_ioctl_kernel+0x10/0x10 [drm] [ +0.000064] ? srso_return_thunk+0x5/0x5f [ +0.000023] ? __kasan_check_write+0x14/0x20 [ +0.000025] drm_ioctl+0x513/0xd20 [drm] [ +0.000058] ? __pfx_amdgpu_userq_wait_ioctl+0x10/0x10 [amdgpu] [ +0.000428] ? __pfx_drm_ioctl+0x10/0x10 [drm] [ +0.000061] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ +0.000027] ? __count_memcg_events+0x11f/0x3a0 [ +0.000027] ? srso_return_thunk+0x5/0x5f [ +0.001040] ? srso_return_thunk+0x5/0x5f [ +0.000969] ? _raw_spin_unlock_irqrestore+0x27/0x50 [ +0.000966] amdgpu_drm_ioctl+0xcd/0x1d0 [amdgpu] [ +0.001352] __x64_sys_ioctl+0x135/0x1b0 [ +0.000966] x64_sys_call+0x1205/0x20d0 [ +0.000968] do_syscall_64+0x4d/0x120 [ +0.000960] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ +0.000962] RIP: 0033:0x7f42af11a94f warning 2: WARNING: at lib/xarray.c:1849 __xa_alloc+0x13a/0x150 [ 366.491409] RIP: 0010:__xa_alloc+0x13a/0x150 [ 366.491434] Call Trace: [ 366.491437] <TASK> [ 366.491440] ? show_regs+0x6d/0x80 [ 366.491445] ? __warn+0x91/0x140 [ 366.491450] ? __xa_alloc+0x13a/0x150 [ 366.491453] ? report_bug+0x1c9/0x1e0 [ 366.491459] ? handle_bug+0x63/0xa0 [ 366.491463] ? exc_invalid_op+0x1d/0x80 [ 366.491467] ? asm_exc_invalid_op+0x1f/0x30 [ 366.491476] ? __xa_alloc+0x13a/0x150 [ 366.491484] amdgpu_userq_wait_ioctl+0xe0e/0xfe0 [amdgpu] [ 366.491743] ? idr_alloc_u32+0x97/0xd0 [ 366.491749] ? __pfx_amdgpu_userq_wait_ioctl+0x10/0x10 [amdgpu] [ 366.491912] drm_ioctl_kernel+0xae/0x100 [drm] [ 366.491942] drm_ioctl+0x2a1/0x500 [drm] [ 366.491961] ? __pfx_amdgpu_userq_wait_ioctl+0x10/0x10 [amdgpu] [ 366.492127] ? srso_return_thunk+0x5/0x5f [ 366.492132] ? srso_return_thunk+0x5/0x5f [ 366.492135] ? _raw_spin_unlock_irqrestore+0x2b/0x50 [ 366.492139] amdgpu_drm_ioctl+0x4f/0x90 [amdgpu] [ 366.492288] __x64_sys_ioctl+0x99/0xd0 [ 366.492295] x64_sys_call+0x1209/0x20d0 [ 366.492299] do_syscall_64+0x51/0x120 [ 366.492303] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 366.492418] RIP: 0033:0x7f86f3b1a94f Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com> Acked-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
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.