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[ 413.687439] BUG: unable to handle kernel NULL pointer dereference at 0000000000000548 [ 413.687479] IP: [<ffffffff8109b175>] to_live_kthread+0x5/0x60 [ 413.687507] PGD 1efd12067 [ 413.687519] PUD 1efd11067 [ 413.687531] PMD 0 [ 413.687543] Oops: 0000 [#1] SMP [ 413.687557] Modules linked in: amdgpu(OE) ttm(OE) drm_kms_helper(E) drm(E) i2c_algo_bit(E) fb_sys_fops(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) rpcsec_gss_krb5(E) nfsv4(E) nfs(E) fscache(E) snd_hda_codec_realtek(E) snd_hda_codec_generic(E) snd_hda_codec_hdmi(E) snd_hda_intel(E) eeepc_wmi(E) snd_hda_codec(E) asus_wmi(E) snd_hda_core(E) sparse_keymap(E) snd_hwdep(E) video(E) snd_pcm(E) snd_seq_midi(E) joydev(E) snd_seq_midi_event(E) snd_rawmidi(E) snd_seq(E) snd_seq_device(E) snd_timer(E) kvm(E) irqbypass(E) crct10dif_pclmul(E) snd(E) crc32_pclmul(E) ghash_clmulni_intel(E) soundcore(E) aesni_intel(E) aes_x86_64(E) lrw(E) gf128mul(E) glue_helper(E) ablk_helper(E) cryptd(E) shpchp(E) serio_raw(E) i2c_piix4(E) 8250_dw(E) i2c_designware_platform(E) i2c_designware_core(E) mac_hid(E) binfmt_misc(E) [ 413.687894] parport_pc(E) ppdev(E) lp(E) parport(E) nfsd(E) auth_rpcgss(E) nfs_acl(E) lockd(E) grace(E) sunrpc(E) autofs4(E) hid_generic(E) usbhid(E) hid(E) psmouse(E) ahci(E) r8169(E) mii(E) libahci(E) wmi(E) [ 413.687989] CPU: 13 PID: 1134 Comm: kworker/13:2 Tainted: G OE 4.9.0-custom #4 [ 413.688019] Hardware name: System manufacturer System Product Name/PRIME B350-PLUS, BIOS 0606 04/06/2017 [ 413.688089] Workqueue: events amd_sched_job_timedout [amdgpu] [ 413.688116] task: ffff88020f9657c0 task.stack: ffffc90001a88000 [ 413.688139] RIP: 0010:[<ffffffff8109b175>] [<ffffffff8109b175>] to_live_kthread+0x5/0x60 [ 413.688171] RSP: 0018:ffffc90001a8bd60 EFLAGS: 00010282 [ 413.688191] RAX: ffff88020f0073f8 RBX: ffff88020f000000 RCX: 0000000000000000 [ 413.688217] RDX: 0000000000000001 RSI: ffff88020f9670c0 RDI: 0000000000000000 [ 413.688243] RBP: ffffc90001a8bd78 R08: 0000000000000000 R09: 0000000000001000 [ 413.688269] R10: 0000006051b11a82 R11: 0000000000000001 R12: 0000000000000000 [ 413.688295] R13: ffff88020f002770 R14: ffff88020f004838 R15: ffff8801b23c2c60 [ 413.688321] FS: 0000000000000000(0000) GS:ffff88021ef40000(0000) knlGS:0000000000000000 [ 413.688352] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 413.688373] CR2: 0000000000000548 CR3: 00000001efd0f000 CR4: 00000000003406e0 [ 413.688399] Stack: [ 413.688407] ffffffff8109b304 ffff88020f000000 0000000000000070 ffffc90001a8bdf0 [ 413.688439] ffffffffa05ce29d ffffffffa052feb7 ffffffffa07b5820 ffffc90001a8bda0 [ 413.688470] ffffffff00000018 ffff8801bb88f060 0000000001a8bdb8 ffff88021ef59280 [ 413.688502] Call Trace: [ 413.688514] [<ffffffff8109b304>] ? kthread_park+0x14/0x60 [ 413.688555] [<ffffffffa05ce29d>] amdgpu_gpu_reset+0x7d/0x670 [amdgpu] [ 413.688589] [<ffffffffa052feb7>] ? drm_printk+0x97/0xa0 [drm] [ 413.688643] [<ffffffffa0698136>] amdgpu_job_timedout+0x46/0x50 [amdgpu] [ 413.688700] [<ffffffffa06969e7>] amd_sched_job_timedout+0x17/0x20 [amdgpu] [ 413.688727] [<ffffffff81095493>] process_one_work+0x153/0x3f0 [ 413.688751] [<ffffffff81095c5b>] worker_thread+0x12b/0x4b0 [ 413.688773] [<ffffffff8100392e>] ? do_syscall_64+0x6e/0x180 [ 413.688795] [<ffffffff81095b30>] ? rescuer_thread+0x350/0x350 [ 413.688818] [<ffffffff8100392e>] ? do_syscall_64+0x6e/0x180 [ 413.688839] [<ffffffff8109b423>] kthread+0xd3/0xf0 [ 413.688858] [<ffffffff8109b350>] ? kthread_park+0x60/0x60 [ 413.688881] [<ffffffff817e1ee5>] ret_from_fork+0x25/0x30 [ 413.688901] Code: 25 40 d3 00 00 48 8b 80 48 05 00 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <48> 8b b7 48 05 00 00 55 48 89 e5 48 85 f6 74 31 8b 97 f8 18 00 [ 413.689045] RIP [<ffffffff8109b175>] to_live_kthread+0x5/0x60 [ 413.689064] RSP <ffffc90001a8bd60> [ 413.689076] CR2: 0000000000000548 [ 413.697985] ---[ end trace 0a314a64821f84e9 ]--- The root cause is some ring doesn't have scheduler, like KIQ ring Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Chunming Zhou <David1.Zhou@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.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.