FYI, we noticed the following commit (built with gcc-7): commit: 09ded8af57bcef7287b8242087d3e7556380de62 ("drm/i915/fbdev: Move intel_fb_initial_config() to fbdev helper") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master in testcase: plzip with following parameters: nr_threads: 100% cpufreq_governor: performance ucode: 0x12 on test machine: 144 threads Intel(R) Xeon(R) CPU E7-8890 v3 @ 2.50GHz with 512G memory caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +-------------------------------------------------+------------+------------+ | | e33898a207 | 09ded8af57 | +-------------------------------------------------+------------+------------+ | boot_successes | 14 | 4 | | boot_failures | 3 | | | BUG:kernel_reboot-without-warning_in_test_stage | 3 | | | dmesg.RIP:drm_setup_crtcs[drm_kms_helper] | 0 | 4 | +-------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot [ 35.625371] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 [ 35.634549] #PF error: [normal kernel read fault] [ 35.639800] PGD 0 P4D 0 [ 35.639805] Oops: 0000 [#1] SMP PTI [ 35.646527] CPU: 53 PID: 1179 Comm: systemd-udevd Not tainted 5.1.0-rc2-01104-g09ded8a #1 [ 35.655659] Hardware name: Intel Corporation BRICKLAND/BRICKLAND, BIOS BRHSXSD1.86B.0067.R02.1507221722 07/22/2015 [ 35.667239] RIP: 0010:drm_setup_crtcs+0x3eb/0x1020 [drm_kms_helper] [ 35.674236] Code: 44 24 60 48 8b 04 24 4c 01 f0 80 38 00 0f 84 a3 07 00 00 41 8b 8d 1c 03 00 00 83 f9 01 0f 84 5f 09 00 00 49 8b 95 e0 03 00 00 <48> 83 7a 10 00 0f 84 e0 01 00 00 48 8b 52 08 48 85 d2 0f 84 d1 01 [ 35.695199] RSP: 0000:ffffc9000f9938c0 EFLAGS: 00010297 [ 35.701035] RAX: ffff88c083da2198 RBX: ffff88c083da2180 RCX: 0000000000000000 [ 35.709000] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88c083da21a1 [ 35.716966] RBP: 0000000000000000 R08: ffff88e083ab7d48 R09: 0000000000000000 [ 35.724934] R10: 0000000000000000 R11: ffff889fed53ec18 R12: 0000000000000001 [ 35.732894] R13: ffff888103a92800 R14: 0000000000000000 R15: 0000000000000001 [ 35.740863] FS: 00007fe6402648c0(0000) GS:ffff88dfff640000(0000) knlGS:0000000000000000 [ 35.749898] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.756312] CR2: 0000000000000010 CR3: 000000807c142003 CR4: 00000000001606e0 [ 35.764278] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.772235] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.780201] Call Trace: [ 35.782946] __drm_fb_helper_initial_config_and_unlock+0x46/0x540 [drm_kms_helper] [ 35.791404] mgag200_fbdev_init+0xc6/0xe0 [mgag200] [ 35.796855] mgag200_modeset_init+0x150/0x1b0 [mgag200] [ 35.802694] mgag200_driver_load+0x359/0x4d0 [mgag200] [ 35.808470] drm_dev_register+0x11c/0x1b0 [drm] [ 35.813547] drm_get_pci_dev+0x9d/0x180 [drm] [ 35.814299] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 35.818417] local_pci_probe+0x42/0x90 [ 35.818427] ? _cond_resched+0x19/0x30 [ 35.827168] ata5.00: ATAPI: TEAC DV-W28S-W, 1.0A, max UDMA/100 [ 35.829511] pci_device_probe+0x141/0x1b0 [ 35.829521] really_probe+0xf8/0x3e0 [ 35.835771] ata5.00: configured for UDMA/100 [ 35.840505] driver_probe_device+0x10f/0x120 [ 35.840511] device_driver_attach+0x50/0x60 [ 35.847061] scsi 5:0:0:0: CD-ROM TEAC DV-W28S-W 1.0A PQ: 0 ANSI: 5 [ 35.848979] __driver_attach+0x9a/0x140 [ 35.848983] ? device_driver_attach+0x60/0x60 [ 35.848987] bus_for_each_dev+0x76/0xc0 [ 35.848996] ? klist_add_tail+0x3b/0x70 [ 35.889929] bus_add_driver+0x141/0x210 [ 35.894214] ? 0xffffffffc078d000 [ 35.897914] driver_register+0x5b/0xe0 [ 35.902093] ? 0xffffffffc078d000 [ 35.905805] do_one_initcall+0x46/0x1e4 [ 35.910089] ? _cond_resched+0x19/0x30 [ 35.914279] ? kmem_cache_alloc_trace+0x3b/0x1d0 [ 35.919439] do_init_module+0x5b/0x210 [ 35.923630] load_module+0x1838/0x1f00 [ 35.927822] ? ima_post_read_file+0xe2/0x120 [ 35.932592] ? __do_sys_finit_module+0xe9/0x110 [ 35.937650] __do_sys_finit_module+0xe9/0x110 [ 35.942508] do_syscall_64+0x5b/0x1a0 [ 35.946595] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 35.952226] RIP: 0033:0x7fe63f0e1229 [ 35.956210] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 3f 4c 2b 00 f7 d8 64 89 01 48 [ 35.977171] RSP: 002b:00007fff141d8258 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 35.985624] RAX: ffffffffffffffda RBX: 000055dca71ebe70 RCX: 00007fe63f0e1229 [ 35.993580] RDX: 0000000000000000 RSI: 00007fe63f9fa265 RDI: 0000000000000015 [ 36.001545] RBP: 00007fe63f9fa265 R08: 0000000000000000 R09: 00007fff141d87d0 [ 36.009511] R10: 0000000000000015 R11: 0000000000000246 R12: 0000000000000000 [ 36.017477] R13: 000055dca71ff2f0 R14: 0000000000020000 R15: 000055dca5594cbc [ 36.025436] Modules linked in: irqbypass mgag200(+) ttm snd_pcm crct10dif_pclmul crc32_pclmul crc32c_intel snd_timer ipmi_ssif ghash_clmulni_intel drm_kms_helper ahci snd syscopyarea aesni_intel sysfillrect sysimgblt crypto_simd fb_sys_fops libahci soundcore cryptd mpt3sas(+) glue_helper pcspkr drm joydev libata ipmi_si raid_class lpc_ich i2c_i801 scsi_transport_sas ipmi_devintf wmi ipmi_msghandler acpi_pad pcc_cpufreq ip_tables [ 36.067874] CR2: 0000000000000010 [ 36.071721] ---[ end trace d29a594eb030ca5d ]--- To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Rong Chen