Kernel crash/Null pointer dereference on vblank

Martin Babutzka martin.babutzka at online.de
Wed Nov 22 07:06:38 UTC 2017 

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bool dce110_vblank_set(
                struct irq_service *irq_service,
                const struct irq_source_info *info,
                bool enable)
{
printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);
        struct dc_context *dc_ctx = irq_service->ctx;
printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);
        struct dc *core_dc = irq_service->ctx->dc;
printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);
        enum dc_irq_source dal_irq_src = dc_interrupt_to_irq_source(
                                                                                irq_service->ctx->dc,
                                                                                info->src_id,
                                                                                info->ext_id);
        uint8_t pipe_offset = dal_irq_src - IRQ_TYPE_VBLANK;
printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);

        struct timing_generator *tg =
                        core_dc->current_state->res_ctx.pipe_ctx[pipe_offset].stream_res.tg;
printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);

        if (enable) {
                if (!tg->funcs->arm_vert_intr(tg, 2)) {
                        DC_ERROR("Failed to get VBLANK!\n");
                        return false;
                }
        }
printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);

        dal_irq_service_set_generic(irq_service, info, enable);
printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);
        return true;

}


"normal" vblank during boot:
Nov 19 22:33:10 Main-PC kernel: [   17.605100] DEBUG: Passed dce110_vblank_set 208 
Nov 19 22:33:10 Main-PC kernel: [   17.605102] DEBUG: Passed dce110_vblank_set 210 
Nov 19 22:33:10 Main-PC kernel: [   17.605103] DEBUG: Passed dce110_vblank_set 212 
Nov 19 22:33:10 Main-PC kernel: [   17.605104] DEBUG: Passed dce110_vblank_set 218 
Nov 19 22:33:10 Main-PC kernel: [   17.605104] DEBUG: Passed dce110_vblank_set 222 
Nov 19 22:33:10 Main-PC kernel: [   17.605108] DEBUG: Passed dce110_vblank_set 230 
Nov 19 22:33:10 Main-PC kernel: [   17.605110] DEBUG: Passed dce110_vblank_set 233 

vblank on screen lock in kernel.log/syslog:
Nov 19 22:34:10 Main-PC kernel: [   78.664890] DEBUG: Passed dce110_vblank_set 208 
Nov 19 22:34:10 Main-PC kernel: [   78.664892] DEBUG: Passed dce110_vblank_set 210 
Nov 19 22:34:10 Main-PC kernel: [   78.664893] DEBUG: Passed dce110_vblank_set 212 
Nov 19 22:34:10 Main-PC kernel: [   78.664894] DEBUG: Passed dce110_vblank_set 218 
Nov 19 22:34:10 Main-PC kernel: [   78.664894] DEBUG: Passed dce110_vblank_set 222 
Nov 19 22:34:10 Main-PC kernel: [   78.664895] DEBUG: Passed dce110_vblank_set 230 
Nov 19 22:34:10 Main-PC kernel: [   78.664896] DEBUG: Passed dce110_vblank_set 233 
Nov 19 22:34:27 Main-PC kernel: [   96.113426] DEBUG: Passed dce110_vblank_set 208 
Nov 19 22:34:27 Main-PC kernel: [   96.113433] DEBUG: Passed dce110_vblank_set 210 
Nov 19 22:34:27 Main-PC kernel: [   96.113435] DEBUG: Passed dce110_vblank_set 212 
Nov 19 22:34:27 Main-PC kernel: [   96.113438] DEBUG: Passed dce110_vblank_set 218 
Nov 19 22:34:27 Main-PC kernel: [   96.113440] DEBUG: Passed dce110_vblank_set 222 
Nov 19 22:34:27 Main-PC kernel: [   96.113448] BUG: unable to handle kernel NULL pointer dereference at           (null)
Nov 19 22:34:27 Main-PC kernel: [   96.113521] IP: dce110_vblank_set+0xe2/0x160 [amdgpu]
Nov 19 22:34:27 Main-PC kernel: [   96.113524] PGD 0 P4D 0 
Nov 19 22:34:27 Main-PC kernel: [   96.113531] Oops: 0000 [#1] SMP
Nov 19 22:34:27 Main-PC kernel: [   96.113535] Modules linked in: rfcomm bnep binfmt_misc snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm snd_pcm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_seq_midi pcbc dm_crypt snd_seq_midi_event aesni_intel snd_rawmidi aes_x86_64 crypto_simd glue_helper snd_seq cryptd snd_seq_device snd_timer intel_cstate intel_rapl_perf snd btusb serio_raw joydev input_leds soundcore btrtl hci_uart mei_me shpchp btbcm mei serdev btqca btintel bluetooth ecdh_generic intel_lpss_acpi intel_lpss acpi_als mac_hid kfifo_buf acpi_pad tpm_infineon industrialio parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic uas usb_storage usbhid amdkfd amd_iommu_v2
Nov 19 22:34:27 Main-PC kernel: [   96.113614]  amdgpu chash i2c_algo_bit ttm drm_kms_helper e1000e syscopyarea sysfillrect sysimgblt fb_sys_fops ptp r8169 pps_core drm ahci mii libahci wmi pinctrl_sunrisepoint video i2c_hid pinctrl_intel hid
Nov 19 22:34:27 Main-PC kernel: [   96.113643] CPU: 2 PID: 1462 Comm: xfwm4 Not tainted 4.14.0+ #3
Nov 19 22:34:27 Main-PC kernel: [   96.113645] Hardware name: Gigabyte Technology Co., Ltd. B250-HD3P/B250-HD3P-CF, BIOS F3 12/07/2016
Nov 19 22:34:27 Main-PC kernel: [   96.113649] task: ffff998d53040000 task.stack: ffffa59103150000
Nov 19 22:34:27 Main-PC kernel: [   96.113710] RIP: 0010:dce110_vblank_set+0xe2/0x160 [amdgpu]
Nov 19 22:34:27 Main-PC kernel: [   96.113713] RSP: 0018:ffffa59103153b28 EFLAGS: 00010002
Nov 19 22:34:27 Main-PC kernel: [   96.113717] RAX: 0000000000000024 RBX: ffff998d5c3d4300 RCX: 0000000000000006
Nov 19 22:34:27 Main-PC kernel: [   96.113720] RDX: 0000000000000000 RSI: 0000000000000086 RDI: ffff998d6ec8dc90
Nov 19 22:34:27 Main-PC kernel: [   96.113723] RBP: ffffa59103153b58 R08: 0000000000000000 R09: 00000000000003ff
Nov 19 22:34:27 Main-PC kernel: [   96.113726] R10: 00007ffebd2bebc0 R11: ffffffffa354feed R12: ffffffffc052b3e0
Nov 19 22:34:27 Main-PC kernel: [   96.113728] R13: 0000000000000001 R14: ffff998d51695100 R15: 0000000000000000
Nov 19 22:34:27 Main-PC kernel: [   96.113732] FS:  00007f4e2f002a80(0000) GS:ffff998d6ec80000(0000) knlGS:0000000000000000
Nov 19 22:34:27 Main-PC kernel: [   96.113735] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Nov 19 22:34:27 Main-PC kernel: [   96.113738] CR2: 0000000000000000 CR3: 00000004181e5001 CR4: 00000000003606e0
Nov 19 22:34:27 Main-PC kernel: [   96.113741] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Nov 19 22:34:27 Main-PC kernel: [   96.113744] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Nov 19 22:34:27 Main-PC kernel: [   96.113746] Call Trace:
Nov 19 22:34:27 Main-PC kernel: [   96.113807]  dal_irq_service_set+0x49/0x90 [amdgpu]
Nov 19 22:34:27 Main-PC kernel: [   96.113863]  dc_interrupt_set+0x24/0x30 [amdgpu]
Nov 19 22:34:27 Main-PC kernel: [   96.113933]  amdgpu_dm_set_crtc_irq_state+0x35/0x60 [amdgpu]
Nov 19 22:34:27 Main-PC kernel: [   96.113989]  amdgpu_irq_update+0x58/0xa0 [amdgpu]
Nov 19 22:34:27 Main-PC kernel: [   96.114041]  amdgpu_irq_get+0x49/0x60 [amdgpu]
Nov 19 22:34:27 Main-PC kernel: [   96.114076]  amdgpu_enable_vblank_kms+0x27/0x30 [amdgpu]
Nov 19 22:34:27 Main-PC kernel: [   96.114091]  drm_vblank_enable+0x84/0x100 [drm]
Nov 19 22:34:27 Main-PC kernel: [   96.114104]  drm_vblank_get+0x92/0xb0 [drm]
Nov 19 22:34:27 Main-PC kernel: [   96.114116]  drm_wait_vblank_ioctl+0xb4/0x580 [drm]
Nov 19 22:34:27 Main-PC kernel: [   96.114123]  ? unix_stream_recvmsg+0x51/0x70
Nov 19 22:34:27 Main-PC kernel: [   96.114127]  ? __unix_insert_socket+0x40/0x40
Nov 19 22:34:27 Main-PC kernel: [   96.114140]  ? drm_legacy_modeset_ctl_ioctl+0x100/0x100 [drm]
Nov 19 22:34:27 Main-PC kernel: [   96.114152]  drm_ioctl_kernel+0x5d/0xb0 [drm]
Nov 19 22:34:27 Main-PC kernel: [   96.114163]  drm_ioctl+0x31b/0x3d0 [drm]
Nov 19 22:34:27 Main-PC kernel: [   96.114174]  ? drm_legacy_modeset_ctl_ioctl+0x100/0x100 [drm]
Nov 19 22:34:27 Main-PC kernel: [   96.114180]  ? do_iter_write+0xe1/0x190
Nov 19 22:34:27 Main-PC kernel: [   96.114215]  amdgpu_drm_ioctl+0x4f/0x90 [amdgpu]
Nov 19 22:34:27 Main-PC kernel: [   96.114222]  do_vfs_ioctl+0xa5/0x610
Nov 19 22:34:27 Main-PC kernel: [   96.114227]  ? __sys_recvmsg+0x51/0x90
Nov 19 22:34:27 Main-PC kernel: [   96.114231]  ? __sys_recvmsg+0x51/0x90
Nov 19 22:34:27 Main-PC kernel: [   96.114237]  SyS_ioctl+0x79/0x90
Nov 19 22:34:27 Main-PC kernel: [   96.114243]  entry_SYSCALL_64_fastpath+0x1e/0xa9
Nov 19 22:34:27 Main-PC kernel: [   96.114247] RIP: 0033:0x7f4e2b64dea7
Nov 19 22:34:27 Main-PC kernel: [   96.114250] RSP: 002b:00007ffebd2bec08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
Nov 19 22:34:27 Main-PC kernel: [   96.114254] RAX: ffffffffffffffda RBX: 0000562e1f5938c0 RCX: 00007f4e2b64dea7
Nov 19 22:34:27 Main-PC kernel: [   96.114257] RDX: 00007ffebd2bec80 RSI: 00000000c018643a RDI: 0000000000000006
Nov 19 22:34:27 Main-PC kernel: [   96.114259] RBP: 0000562e1f620ce0 R08: 00000000006001e5 R09: 0000000000000000
Nov 19 22:34:27 Main-PC kernel: [   96.114262] R10: 00007ffebd2bebc0 R11: 0000000000000246 R12: 0000000000000000
Nov 19 22:34:27 Main-PC kernel: [   96.114264] R13: 0000000000000007 R14: 0000000000000007 R15: 0000562e1f5938c0
Nov 19 22:34:27 Main-PC kernel: [   96.114268] Code: 48 89 d0 48 c1 e0 05 48 01 d0 ba de 00 00 00 48 c1 e0 05 49 03 87 30 01 00 00 4c 8b b8 78 02 00 00 e8 c4 c2 04 e2 45 84 ed 74 38 <49> 8b 07 be 02 00 00 00 4c 89 ff ff 90 e0 00 00 00 84 c0 75 23 
Nov 19 22:34:27 Main-PC kernel: [   96.114392] RIP: dce110_vblank_set+0xe2/0x160 [amdgpu] RSP: ffffa59103153b28
Nov 19 22:34:27 Main-PC kernel: [   96.114394] CR2: 0000000000000000
Nov 19 22:34:27 Main-PC kernel: [   96.114399] ---[ end trace 4160248d2f91cb42 ]---

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