On Wed, Jan 15, 2020 at 05:16:35PM +0100, Gerd Hoffmann wrote: > On Wed, Jan 15, 2020 at 03:27:41PM +0100, Marek Marczykowski-Górecki wrote: > > On Wed, Jan 15, 2020 at 03:13:53PM +0100, Gerd Hoffmann wrote: > > > Hi, > > > > > > > > And "grep -A1 0000:00:02.0 /proc/iomem" ? > > > > > > > > c0000000-c0ffffff : 0000:00:02.0 > > > > c1000000-c103ffff : 0000:00:04.0 > > > > > > So no reservation left. Whatever blocked the pci bar resource (efifb > > > probably) is gone now. > > > > > > So the interesting question is why that reservation sticked long enough > > > to prevent bochs-drm from initializing. In theory efifb de-init should > > > be completed when drm_fb_helper_remove_conflicting_pci_framebuffers() > > > returns. > > > > Maybe the fact that switching to text mode plymouth help, gives some > > hint? > > Maybe plymouth having a /dev/fb0 file handle open in gfx mode has > something to do with it. But if that is the case I should be able to > reproduce it in theory. Which is not the case though ... Yes, looks like plymouthd is holding some file handle open. It may depend on a specific plymouth configuration, or some timing, I don't know... I've added WARN in put_fb_info() (and few more printks) and got output like the one below. As you can see, first put_fb_info() exit early (before actual destroy) and only second one (in plymouthd context) do the destroy - but too late. Should switching to bochsdrmfb be deferred until efifb gets properly destroyed? How? [ 29.475736] bochs-drm 0000:00:02.0: remove_conflicting_pci_framebuffers: bar 0: 0xc0000000 -> 0xc0ffffff [ 29.475740] bochs-drm 0000:00:02.0: remove_conflicting_pci_framebuffers: bar 2: 0xc1087000 -> 0xc1087fff [ 29.475743] checking generic (c0000000 1000000) vs hw (c0000000 1000000) [ 29.475745] fb0: switching to bochsdrmfb from EFI VGA [ 29.475828] ------------[ cut here ]------------ [ 29.475829] EFI VGA [ 29.475883] WARNING: CPU: 1 PID: 863 at drivers/video/fbdev/core/fbmem.c:77 put_fb_info+0x1a/0x30 [ 29.475884] Modules linked in: bochs_drm(+) drm_vram_helper ttm edac_mce_amd pcspkr snd_timer drm_kms_helper snd e1000e soundcore drm i2c_piix4 parport_pc parport xenfs ip_tables dm_thin_pool dm_persistent_data libcrc32c dm_bio_prison dm_crypt ehci_pci serio_raw virtio_console ehci_hcd virtio_scsi ata_generic pata_acpi qemu_fw_cfg floppy xen_privcmd xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn uinput pkcs8_key_parser [ 29.475901] CPU: 1 PID: 863 Comm: systemd-udevd Tainted: G W 5.4.5-1.qubes.x86_64+ #4 [ 29.475902] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 [ 29.475905] RIP: e030:put_fb_info+0x1a/0x30 [ 29.475907] Code: 00 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 0f 1f 44 00 00 41 54 4c 8d a7 f0 00 00 00 55 48 89 fd 4c 89 e7 e8 24 41 b6 ff <0f> 0b f0 ff 4d 00 0f 84 ab 23 00 00 e9 d3 23 00 00 0f 1f 44 00 00 [ 29.475908] RSP: e02b:ffffc90000d8fa00 EFLAGS: 00010286 [ 29.475910] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 29.475911] RDX: 0000000000000007 RSI: ffffffff82d03247 RDI: 0000000000000200 [ 29.475912] RBP: ffff8881360a4800 R08: 00000006dce5772f R09: 0000000000000007 [ 29.475913] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8881360a48f0 [ 29.475913] R13: ffff888135a62d40 R14: 0000000000000000 R15: 0000000000000001 [ 29.475926] FS: 000077896532d940(0000) GS:ffff888140100000(0000) knlGS:0000000000000000 [ 29.475927] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.475928] CR2: 000075109e9ce008 CR3: 000000013b2e8000 CR4: 0000000000000660 [ 29.475931] Call Trace: [ 29.475962] do_remove_conflicting_framebuffers.cold+0xc2/0x112 [ 29.475966] remove_conflicting_framebuffers+0x30/0xc0 [ 29.475968] remove_conflicting_pci_framebuffers+0xb4/0xe0 [ 29.475973] bochs_pci_probe+0x49/0x160 [bochs_drm] [ 29.475978] local_pci_probe+0x42/0x80 [ 29.475981] pci_device_probe+0x107/0x1a0 [ 29.475985] really_probe+0x147/0x3c0 [ 29.475988] driver_probe_device+0xb6/0x100 [ 29.475991] device_driver_attach+0x53/0x60 [ 29.475993] __driver_attach+0x8a/0x150 [ 29.475995] ? device_driver_attach+0x60/0x60 [ 29.475997] bus_for_each_dev+0x78/0xc0 [ 29.475999] bus_add_driver+0x14d/0x1f0 [ 29.476002] driver_register+0x6c/0xc0 [ 29.476004] ? 0xffffffffc02cf000 [ 29.476008] do_one_initcall+0x46/0x1f4 [ 29.476012] ? free_unref_page_commit+0x95/0x110 [ 29.476016] ? _cond_resched+0x15/0x30 [ 29.476018] ? kmem_cache_alloc_trace+0x162/0x220 [ 29.476021] ? do_init_module+0x23/0x230 [ 29.476023] do_init_module+0x5c/0x230 [ 29.476026] load_module+0x28c9/0x2b20 [ 29.476032] ? ima_post_read_file+0xf0/0x100 [ 29.476034] ? __do_sys_finit_module+0xaa/0x110 [ 29.476036] __do_sys_finit_module+0xaa/0x110 [ 29.476039] do_syscall_64+0x5b/0x1a0 [ 29.476042] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 29.476045] RIP: 0033:0x7789662d31ad [ 29.476047] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 ab 5c 0c 00 f7 d8 64 89 01 48 [ 29.476048] RSP: 002b:00007ffcd6612318 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 29.476049] RAX: ffffffffffffffda RBX: 00006395e6ee4e90 RCX: 00007789662d31ad [ 29.476050] RDX: 0000000000000000 RSI: 0000778965efa84d RDI: 0000000000000012 [ 29.476051] RBP: 0000000000020000 R08: 0000000000000000 R09: 0000000000000007 [ 29.476052] R10: 0000000000000012 R11: 0000000000000246 R12: 0000778965efa84d [ 29.476053] R13: 0000000000000000 R14: 00006395e6ef8be0 R15: 00006395e6ee4e90 [ 29.476055] ---[ end trace 688bd10d7416ac12 ]--- [ 29.476057] put_fb_info: EFI VGA - deferring destroy [ 29.476059] bochs-drm 0000:00:02.0: vgaarb: deactivate vga console [ 29.503578] bochs-drm 0000:00:02.0: BAR 0: can't reserve [mem 0xc0000000-0xc0ffffff pref] [ 29.503586] [drm:bochs_hw_init [bochs_drm]] *ERROR* Cannot request framebuffer [ 29.503629] bochs-drm: probe of 0000:00:02.0 failed with error -16 [ 29.802210] ppdev: user-space parallel port driver [ 29.935199] ------------[ cut here ]------------ [ 29.935202] EFI VGA [ 29.935290] WARNING: CPU: 1 PID: 357 at drivers/video/fbdev/core/fbmem.c:77 put_fb_info+0x1a/0x30 [ 29.935291] Modules linked in: ppdev snd_intel8x0(+) joydev snd_ac97_codec ac97_bus snd_seq snd_seq_device snd_pcm bochs_drm drm_vram_helper ttm edac_mce_amd pcspkr snd_timer drm_kms_helper snd e1000e soundcore drm i2c_piix4 parport_pc parport xenfs ip_tables dm_thin_pool dm_persistent_data libcrc32c dm_bio_prison dm_crypt ehci_pci serio_raw virtio_console ehci_hcd virtio_scsi ata_generic pata_acpi qemu_fw_cfg floppy xen_privcmd xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn uinput pkcs8_key_parser [ 29.935347] CPU: 1 PID: 357 Comm: plymouthd Tainted: G W 5.4.5-1.qubes.x86_64+ #4 [ 29.935348] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 [ 29.935351] RIP: e030:put_fb_info+0x1a/0x30 [ 29.935354] Code: 00 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 0f 1f 44 00 00 41 54 4c 8d a7 f0 00 00 00 55 48 89 fd 4c 89 e7 e8 24 41 b6 ff <0f> 0b f0 ff 4d 00 0f 84 ab 23 00 00 e9 d3 23 00 00 0f 1f 44 00 00 [ 29.935355] RSP: e02b:ffffc90000ed7e58 EFLAGS: 00010282 [ 29.935356] RAX: 0000000000000000 RBX: 00000000000e001f RCX: 0000000000000000 [ 29.935357] RDX: 0000000000000007 RSI: ffffffff82d03247 RDI: 0000000000000200 [ 29.935358] RBP: ffff8881360a4800 R08: 00000006f846f211 R09: 0000000000000007 [ 29.935359] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8881360a48f0 [ 29.935376] R13: ffff88813b242fb8 R14: ffff88813625a160 R15: ffff88813a902a80 [ 29.935390] FS: 00007857d81d1f00(0000) GS:ffff888140100000(0000) knlGS:0000000000000000 [ 29.935391] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.935392] CR2: 00006395e6ed0180 CR3: 0000000135b62000 CR4: 0000000000000660 [ 29.935412] Call Trace: [ 29.935423] fb_release+0x57/0x60 [ 29.935428] __fput+0xc1/0x250 [ 29.935432] task_work_run+0x8a/0xb0 [ 29.935437] exit_to_usermode_loop+0x102/0x130 [ 29.935440] do_syscall_64+0x17e/0x1a0 [ 29.935444] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 29.935448] RIP: 0033:0x7857d8489c57 [ 29.935449] Code: ff ff e8 fc e8 01 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 a3 41 f9 ff [ 29.935450] RSP: 002b:00007ffcf4c872b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 29.935452] RAX: 0000000000000000 RBX: 000056802e2207d0 RCX: 00007857d8489c57 [ 29.935453] RDX: 000056802e221b50 RSI: 0000000000000000 RDI: 000000000000000a [ 29.935453] RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 [ 29.935454] R10: 00007ffcf4c870d4 R11: 0000000000000246 R12: 000056802e221c20 [ 29.935455] R13: 000056802e2ae2d0 R14: 0000000000000001 R15: 000056802e222d40 [ 29.935457] ---[ end trace 688bd10d7416ac13 ]--- [ 29.935459] put_fb_info: EFI VGA - calling destroy [ 29.935460] efifb_destroy [ 29.935461] efifb_destroy: iounmap/memunmap [ 29.939559] efifb_destroy: release_mem_region 0xc0000000-0xc1000000 [ 29.939562] Trying to free nonexistent resource <00000000c0000000-00000000c0ffffff> -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing?
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