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Fix the NULL point issue: [ 3076.255609] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 3076.255624] #PF: supervisor instruction fetch in kernel mode [ 3076.255637] #PF: error_code(0x0010) - not-present page [ 3076.255649] PGD 0 P4D 0 [ 3076.255660] Oops: 0010 [#1] SMP NOPTI [ 3076.255669] CPU: 20 PID: 2415 Comm: kfdtest Tainted: G W OE 5.11.0-41-generic #45~20.04.1-Ubuntu [ 3076.255691] Hardware name: AMD Splinter/Splinter-RPL, BIOS VS2326337N.FD 02/07/2022 [ 3076.255706] RIP: 0010:0x0 [ 3076.255718] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. [ 3076.255732] RSP: 0018:ffffb64283e3fc10 EFLAGS: 00010297 [ 3076.255744] RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000027 [ 3076.255759] RDX: ffffb64283e3fc1e RSI: 0000000000000008 RDI: ffff8c7a87f60000 [ 3076.255776] RBP: ffffb64283e3fc78 R08: ffff8c7d88518ac0 R09: ffffb64283e3fa60 [ 3076.255791] R10: 0000000000000001 R11: 0000000000000001 R12: 000000000000000f [ 3076.255805] R13: ffff8c7bdcea5800 R14: ffff8c7a9f3f3000 R15: ffff8c7a8696bc00 [ 3076.255820] FS: 0000000000000000(0000) GS:ffff8c7d88500000(0000) knlGS:0000000000000000 [ 3076.255839] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3076.255851] CR2: ffffffffffffffd6 CR3: 0000000109e3c000 CR4: 0000000000750ee0 [ 3076.255866] PKRU: 55555554 [ 3076.255873] Call Trace: [ 3076.255884] dbgdev_wave_reset_wavefronts+0x72/0x160 [amdgpu] [ 3076.256025] process_termination_cpsch.cold+0x26/0x2f [amdgpu] [ 3076.256182] ? ktime_get_mono_fast_ns+0x4e/0xa0 [ 3076.256196] kfd_process_dequeue_from_all_devices+0x49/0x70 [amdgpu] [ 3076.256328] kfd_process_notifier_release+0x187/0x2b0 [amdgpu] [ 3076.256451] ? mn_itree_inv_end+0xdc/0x110 [ 3076.256463] __mmu_notifier_release+0x74/0x1f0 [ 3076.256474] exit_mmap+0x170/0x200 [ 3076.256484] ? __handle_mm_fault+0x677/0x920 [ 3076.256496] ? _cond_resched+0x19/0x30 [ 3076.256507] mmput+0x5d/0x130 [ 3076.256518] do_exit+0x332/0xaf0 [ 3076.256526] ? handle_mm_fault+0xd7/0x2b0 [ 3076.256537] do_group_exit+0x43/0xa0 [ 3076.256548] __x64_sys_exit_group+0x18/0x20 [ 3076.256559] do_syscall_64+0x38/0x90 [ 3076.256569] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Signed-off-by: Yifan Zhang <yifan1.zhang@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@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 Restructured Text 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.