Comment # 4
on bug 100375
from Edward O'Callaghan
actually this has nothing to do with the EDID I don't believe as not forcing a EDID makes no difference. The actual root causes is that if a page flip is in progress something races on that fd and causes the null ptr deref: [ 18.281296] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 [ 18.289158] IP: [<ffffffff81169a8d>] set_root+0x1d/0xa0 [ 18.294401] PGD 0 [ 18.296239] [ 18.297739] Oops: 0000 [#1] SMP [ 18.300885] Modules linked in: amdgpu blackmagic_io(PO) ttm backlight hid_sony led_class [ 18.309086] CPU: 2 PID: 3595 Comm: hyperflow-engin Tainted: P O 4.9.16-gentoo #1 [ 18.317605] Hardware name: BIOSTAR Group A68N-5200/A68N-5200, BIOS 4.6.5 09/03/2015 [ 18.325248] task: ffff8802255755c0 task.stack: ffffc90008f30000 [ 18.331161] RIP: 0010:[<ffffffff81169a8d>] [<ffffffff81169a8d>] set_root+0x1d/0xa0 [ 18.338823] RSP: 0018:ffffc90008f33688 EFLAGS: 00010202 [ 18.344127] RAX: ffff8802255755c0 RBX: ffffc90008f337c0 RCX: ffff880218f12e00 [ 18.351252] RDX: ffffffff81c55e08 RSI: 0000000000000041 RDI: ffffc90008f337c0 [ 18.358376] RBP: ffffc90008f33698 R08: 0000000018f12e01 R09: ffff880218f12e00 [ 18.365501] R10: ffff88021432a024 R11: 0000000000000017 R12: 0000000000000000 [ 18.372626] R13: ffff88021432f01c R14: 0000000000000001 R15: ffff880218de8200 [ 18.379750] FS: 00007fee18f6d740(0000) GS:ffff88022ed00000(0000) knlGS:0000000000000000 [ 18.387827] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 18.393566] CR2: 0000000000000008 CR3: 0000000001a08000 CR4: 00000000000406e0 [ 18.400690] Stack: [ 18.402701] ffffc90008f337c0 0000000000000041 ffffc90008f336d8 ffffffff81169dc9 [ 18.410155] ffff880219f7e300 ffff88021432f000 ffffc90008f337c0 ffffc90008f338cc [ 18.417607] 0000000000000001 ffff880218de8200 ffffc90008f337b0 ffffffff8116c3aa [ 18.425063] Call Trace: [ 18.427510] [<ffffffff81169dc9>] path_init+0x1e9/0x330 [ 18.432735] [<ffffffff8116c3aa>] path_openat+0x6a/0x1480 [ 18.438137] [<ffffffff81079c3d>] ? default_wake_function+0xd/0x10 [ 18.444315] [<ffffffff8108ce3d>] ? __wake_up_common+0x4d/0x80 [ 18.450149] [<ffffffff8116f3c9>] do_filp_open+0x79/0xd0 [ 18.455463] [<ffffffff8134fba8>] ? acpi_driver_match_device+0x3d/0x5d [ 18.461987] [<ffffffff813d7164>] ? platform_match+0x24/0xa0 [ 18.467639] [<ffffffff816039f1>] ? klist_next+0x21/0xf0 [ 18.472944] [<ffffffff8115e82f>] file_open_name+0xdf/0x100 [ 18.478515] [<ffffffff8115e87e>] filp_open+0x2e/0x50 [ 18.483560] [<ffffffff811657b1>] kernel_read_file_from_path+0x31/0x70 [ 18.490079] [<ffffffff813e094f>] _request_firmware+0x2ef/0x5a0 [ 18.495989] [<ffffffff813e0c32>] request_firmware+0x32/0x50 [ 18.501649] [<ffffffff813a9f14>] drm_load_edid_firmware+0x264/0x500 [ 18.507996] [<ffffffff8139ec0c>] drm_helper_probe_single_connector_modes+0x14c/0x4d0 [ 18.515822] [<ffffffff813aaf28>] drm_fb_helper_probe_connector_modes.isra.7+0x48/0x70 [ 18.523735] [<ffffffff813aca84>] drm_fb_helper_hotplug_event+0x94/0xd0 [ 18.530347] [<ffffffff813acc7c>] drm_fb_helper_restore_fbdev_mode_unlocked+0x1bc/0x2a0 [ 18.538370] [<ffffffffa01003d5>] amdgpu_fbdev_restore_mode+0x15/0x40 [amdgpu] [ 18.545605] [<ffffffffa00ed8dd>] amdgpu_driver_lastclose_kms+0xd/0x10 [amdgpu] [ 18.552909] [<ffffffff813b0bb6>] drm_lastclose+0x36/0xf0 [ 18.558300] [<ffffffff813b0f15>] drm_release+0x2a5/0x360 [ 18.563691] [<ffffffff811611ca>] __fput+0xda/0x1e0 [ 18.568561] [<ffffffff81161309>] ____fput+0x9/0x10 [ 18.573435] [<ffffffff8106e9a9>] task_work_run+0x79/0xa0 [ 18.578834] [<ffffffff8105738a>] do_exit+0x34a/0xaa0 [ 18.583886] [<ffffffff81058940>] do_group_exit+0x40/0xa0 [ 18.589277] [<ffffffff81062892>] get_signal+0x272/0x5e0 [ 18.594582] [<ffffffff8101bfd3>] do_signal+0x23/0x5b0 [ 18.599712] [<ffffffff81061978>] ? do_send_sig_info+0x58/0x70 [ 18.605537] [<ffffffff8100222e>] exit_to_usermode_loop+0x4e/0x80 [ 18.611620] [<ffffffff81002673>] syscall_return_slowpath+0x43/0x50 [ 18.617881] [<ffffffff81609a9f>] entry_SYSCALL_64_fastpath+0x92/0x94 [ 18.624327] Code: 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 65 48 8b 04 25 40 c4 00 00 48 89 e5 41 54 53 f6 47 38 40 4c 8b a0 68 05 00 00 74 39 <41> 8b 4c 24 08 f6 c1 01 75 6d 49 8b 54 24 20 [ 18.644280] RIP [<ffffffff81169a8d>] set_root+0x1d/0xa0 [ 18.649600] RSP <ffffc90008f33688> [ 18.653086] CR2: 0000000000000008 [ 18.656398] ---[ end trace 506f9f2a94b80534 ]--- [ 18.661007] Fixing recursive fault but reboot is needed!
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