Hi, It looks like bochs_kms_fini() don't like being called if bochs_kms_init() wasn't. Regardless of the reason for the bochs_hw_init() failure (that's another story), it shouldn't cause a panic. Any idea how to fix it? Full message: [ 33.032576] [drm:bochs_hw_init [bochs_drm]] *ERROR* Cannot request framebuffer [ 33.069435] ------------[ cut here ]------------ [ 33.070920] WARNING: CPU: 1 PID: 879 at drivers/gpu/drm/drm_modeset_lock.c:266 drm_modeset_lock+0xef/0x100 [drm] [ 33.073719] Modules linked in: amd64_edac_mod(-) snd_ac97_codec edac_mce_amd ac97_bus snd_seq snd_seq_device bochs_drm(+) drm_vram_helper snd_pcm pcspkr ttm parport_pc drm_kms_helper parport drm i2c_piix4 snd_timer e1000e snd soundcore xenfs ip_tables dm_thin_pool dm_persistent_data dm_bio_prison libcrc32c dm_crypt serio_raw ehci_pci ata_generic virtio_console virtio_scsi pata_acpi ehci_hcd floppy qemu_fw_cfg xen_privcmd xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn uinput pkcs8_key_parser [ 33.085969] CPU: 1 PID: 879 Comm: systemd-udevd Tainted: G W 5.4.5-1.qubes.x86_64 #1 [ 33.088483] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 [ 33.090762] RIP: e030:drm_modeset_lock+0xef/0x100 [drm] [ 33.092213] Code: ff ff eb de e8 22 31 7e c1 41 89 c4 e9 75 ff ff ff 0f 0b e9 4c ff ff ff 41 83 fc 8e 74 c1 41 83 fc dd 75 be 48 89 6b 18 eb b8 <0f> 0b e9 6f ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 [ 33.097304] RSP: e02b:ffffc90000f379d0 EFLAGS: 00010286 [ 33.098741] RAX: 0000000000000000 RBX: ffffc90000f37a40 RCX: 0000000000000000 [ 33.100728] RDX: ffff88813bba2540 RSI: 0000000000000000 RDI: ffff888140128a00 [ 33.102677] RBP: ffff888133931198 R08: 0000000000000000 R09: ffff88813bba4b30 [ 33.104613] R10: 0000000000007ff0 R11: 0000000000000000 R12: 0000000000000000 [ 33.106592] R13: ffff8881339311c0 R14: 0000000000000010 R15: 0000000000000000 [ 33.108555] FS: 00007e279f5e7940(0000) GS:ffff888140100000(0000) knlGS:0000000000000000 [ 33.110654] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.112210] CR2: 000058a34b0d8774 CR3: 0000000138ff0000 CR4: 0000000000000660 [ 33.114124] Call Trace: [ 33.114866] drm_modeset_lock_all_ctx+0x1f/0xe0 [drm] [ 33.116284] drm_atomic_helper_shutdown+0x43/0xc0 [drm_kms_helper] [ 33.118033] bochs_kms_fini+0x12/0x20 [bochs_drm] [ 33.119252] bochs_unload+0x16/0x40 [bochs_drm] [ 33.120570] bochs_pci_probe+0xe8/0x160 [bochs_drm] [ 33.121967] local_pci_probe+0x42/0x80 [ 33.123041] pci_device_probe+0x107/0x1a0 [ 33.124190] really_probe+0x147/0x3c0 [ 33.125233] driver_probe_device+0xb6/0x100 [ 33.126384] device_driver_attach+0x53/0x60 [ 33.127533] __driver_attach+0x8a/0x150 [ 33.128603] ? device_driver_attach+0x60/0x60 [ 33.129830] bus_for_each_dev+0x89/0xd0 [ 33.130920] bus_add_driver+0x14d/0x1f0 [ 33.131990] driver_register+0x6c/0xc0 [ 33.133074] ? 0xffffffffc02a8000 [ 33.134003] do_one_initcall+0x59/0x214 [ 33.135038] do_init_module+0x5c/0x230 [ 33.135044] hrtimer: interrupt took 7595223 ns [ 33.137336] load_module+0x1129/0x1260 [ 33.138355] ? __do_sys_finit_module+0xbb/0x120 [ 33.139656] __do_sys_finit_module+0xbb/0x120 [ 33.140873] do_syscall_64+0x5b/0x1a0 [ 33.141917] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 33.143329] RIP: 0033:0x7e27a058d1ad [ 33.144329] 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 [ 33.150780] RSP: 002b:00007fff32c25888 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 33.152850] RAX: ffffffffffffffda RBX: 00005ef4b82f7e90 RCX: 00007e27a058d1ad [ 33.154721] RDX: 0000000000000000 RSI: 00007e27a01b484d RDI: 0000000000000012 [ 33.156695] RBP: 0000000000020000 R08: 0000000000000000 R09: 0000000000000007 [ 33.158651] R10: 0000000000000012 R11: 0000000000000246 R12: 00007e27a01b484d [ 33.160635] R13: 0000000000000000 R14: 00005ef4b8311570 R15: 00005ef4b82f7e90 [ 33.162572] ---[ end trace 688bd10d7416ac12 ]--- [ 33.430995] ppdev: user-space parallel port driver [ 33.597636] Already setup the GSI :10 [ 33.607033] snd_intel8x0 0000:00:03.0: enable KVM optimization [ 33.752121] BUG: kernel NULL pointer dereference, address: 0000000000000018 [ 33.754174] #PF: supervisor write access in kernel mode [ 33.755600] #PF: error_code(0x0002) - not-present page [ 33.757036] PGD 0 P4D 0 [ 33.757779] Oops: 0002 [#1] SMP NOPTI [ 33.758811] CPU: 1 PID: 879 Comm: systemd-udevd Tainted: G W 5.4.5-1.qubes.x86_64 #1 [ 33.761352] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 [ 33.763587] RIP: e030:ww_mutex_lock+0x20/0x80 [ 33.764813] Code: 1f 84 00 00 00 00 00 0f 1f 00 0f 1f 44 00 00 41 55 41 54 49 89 f4 55 48 89 fd e8 9b e2 ff ff 31 c0 65 48 8b 14 25 c0 6b 01 00 <f0> 48 0f b1 55 00 74 0d 4c 89 e6 48 89 ef 5d 41 5c 41 5d eb ab 4d [ 33.770009] RSP: e02b:ffffc90000f379b0 EFLAGS: 00010246 [ 33.771434] RAX: 0000000000000000 RBX: ffffc90000f37a40 RCX: 0000000000000000 [ 33.773412] RDX: ffff88813bba2540 RSI: 0000000000000000 RDI: ffff888140128a00 [ 33.775359] RBP: 0000000000000018 R08: 0000000000000000 R09: ffff888140129450 [ 33.777334] R10: 0000000000007ff0 R11: 0000000000000000 R12: ffffc90000f37a40 [ 33.779305] R13: 0000000000000000 R14: fffffffffffffff0 R15: 0000000000000000 [ 33.781263] FS: 00007e279f5e7940(0000) GS:ffff888140100000(0000) knlGS:0000000000000000 [ 33.783492] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.785083] CR2: 0000000000000018 CR3: 0000000138ff0000 CR4: 0000000000000660 [ 33.787039] Call Trace: [ 33.787786] drm_modeset_lock+0x48/0x100 [drm] [ 33.789052] drm_modeset_lock_all_ctx+0x58/0xe0 [drm] [ 33.790476] drm_atomic_helper_shutdown+0x43/0xc0 [drm_kms_helper] [ 33.792196] bochs_kms_fini+0x12/0x20 [bochs_drm] [ 33.793491] bochs_unload+0x16/0x40 [bochs_drm] [ 33.794749] bochs_pci_probe+0xe8/0x160 [bochs_drm] [ 33.796107] local_pci_probe+0x42/0x80 [ 33.797180] pci_device_probe+0x107/0x1a0 [ 33.798276] really_probe+0x147/0x3c0 [ 33.799317] driver_probe_device+0xb6/0x100 [ 33.800504] device_driver_attach+0x53/0x60 [ 33.801670] __driver_attach+0x8a/0x150 [ 33.802759] ? device_driver_attach+0x60/0x60 [ 33.803972] bus_for_each_dev+0x89/0xd0 [ 33.805038] bus_add_driver+0x14d/0x1f0 [ 33.806112] driver_register+0x6c/0xc0 [ 33.807159] ? 0xffffffffc02a8000 [ 33.808098] do_one_initcall+0x59/0x214 [ 33.809161] do_init_module+0x5c/0x230 [ 33.810235] load_module+0x1129/0x1260 [ 33.811269] ? __do_sys_finit_module+0xbb/0x120 [ 33.812543] __do_sys_finit_module+0xbb/0x120 [ 33.813768] do_syscall_64+0x5b/0x1a0 [ 33.814772] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 33.816111] RIP: 0033:0x7e27a058d1ad [ 33.817080] 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 [ 33.822091] RSP: 002b:00007fff32c25888 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 33.824104] RAX: ffffffffffffffda RBX: 00005ef4b82f7e90 RCX: 00007e27a058d1ad [ 33.826023] RDX: 0000000000000000 RSI: 00007e27a01b484d RDI: 0000000000000012 [ 33.827948] RBP: 0000000000020000 R08: 0000000000000000 R09: 0000000000000007 [ 33.829914] R10: 0000000000000012 R11: 0000000000000246 R12: 00007e27a01b484d [ 33.831824] R13: 0000000000000000 R14: 00005ef4b8311570 R15: 00005ef4b82f7e90 [ 33.833746] Modules linked in: joydev ppdev snd_intel8x0(+) snd_ac97_codec edac_mce_amd ac97_bus snd_seq snd_seq_device bochs_drm(+) drm_vram_helper snd_pcm pcspkr ttm parport_pc drm_kms_helper parport drm i2c_piix4 snd_timer e1000e snd soundcore xenfs ip_tables dm_thin_pool dm_persistent_data dm_bio_prison libcrc32c dm_crypt serio_raw ehci_pci ata_generic virtio_console virtio_scsi pata_acpi ehci_hcd floppy qemu_fw_cfg xen_privcmd xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn uinput pkcs8_key_parser [ 33.845935] CR2: 0000000000000018 [ 33.847042] ---[ end trace 688bd10d7416ac13 ]--- [ 33.848388] RIP: e030:ww_mutex_lock+0x20/0x80 [ 33.849666] Code: 1f 84 00 00 00 00 00 0f 1f 00 0f 1f 44 00 00 41 55 41 54 49 89 f4 55 48 89 fd e8 9b e2 ff ff 31 c0 65 48 8b 14 25 c0 6b 01 00 <f0> 48 0f b1 55 00 74 0d 4c 89 e6 48 89 ef 5d 41 5c 41 5d eb ab 4d [ 33.854831] RSP: e02b:ffffc90000f379b0 EFLAGS: 00010246 [ 33.856378] RAX: 0000000000000000 RBX: ffffc90000f37a40 RCX: 0000000000000000 [ 33.858349] RDX: ffff88813bba2540 RSI: 0000000000000000 RDI: ffff888140128a00 [ 33.860344] RBP: 0000000000000018 R08: 0000000000000000 R09: ffff888140129450 [ 33.862299] R10: 0000000000007ff0 R11: 0000000000000000 R12: ffffc90000f37a40 [ 33.864294] R13: 0000000000000000 R14: fffffffffffffff0 R15: 0000000000000000 [ 33.866296] FS: 00007e279f5e7940(0000) GS:ffff888140100000(0000) knlGS:0000000000000000 [ 33.868544] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.870179] CR2: 0000000000000018 CR3: 0000000138ff0000 CR4: 0000000000000660 [ 33.872141] Kernel panic - not syncing: Fatal exception [ 33.873609] Kernel Offset: disabled -- 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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