I have an extremely hard problem after upgrading Debian Jessie from 8.3 to 8.4 today. The system is a Dell Vostro with an AMD/ATI Turks PRO [Radeon HD 7570]. The free radeon driver is used for X. Desktop is GNOME3. The resolution is 25560x1440. I've used this resolution for about 3-4 weeks now.
After the upgrade (and a restart), the system freezes from one second to the other. It seems to be independent from the used application. As a work-around, I'm running GNOME classic now. Without the EGL features, the desktop is running now. Currently I avoid using Firefox, because I don't know if the renderer uses EGL. Can someone help? Here is one of the several logged crashes: Apr 4 07:07:11 jd-dell kernel: [ 2025.042433] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 Apr 4 07:07:11 jd-dell kernel: [ 2025.042460] IP: [<ffffffffa02b2c3d>] radeon_fence_ref+0xd/0x50 [radeon] Apr 4 07:07:11 jd-dell kernel: [ 2025.042491] PGD 0 Apr 4 07:07:11 jd-dell kernel: [ 2025.042498] Oops: 0002 [#1] SMP Apr 4 07:07:11 jd-dell kernel: [ 2025.042508] Modules linked in: sha256_ssse3 sha256_generic dm_crypt algif_skcipher af_alg dm_mod rpcsec_gss_krb5 nfsv4 dns_resolver joydev hid_logitech_dj usb_storage hid_generic bnep binfmt_misc usbhid hid pci_stub vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc ath3k ecb btusb bluetooth 6lowpan_iphc wl(PO) x86_pkg_temp_thermal intel_powerclamp intel_rapl arc4 coretemp kvm_intel kvm ath9k crc32_pclmul ath9k_common ath9k_hw fglrx(PO) ath aesni_intel mac80211 aes_x86_64 lrw gf128mul cfg80211 glue_helper ablk_helper iTCO_wdt iTCO_vendor_support snd_hda_codec_realtek snd_hda_codec_generic dcdbas cryptd rfkill serio_raw snd_hda_codec_hdmi i2c_i801 pcspkr snd_hda_intel snd_hda_controller snd_hda_codec lpc_ich mfd_core snd_hwdep snd_pcm snd_timer snd battery soundcore ie31200_edac shpchp mei_me edac_core mei processor evdev vmhgfs(O) vmw_vmci fuse parport_pc ppdev lp parport autofs4 ext4 crc16 mbcache jbd2 sg sd_mod crc_t10dif sr_mod crct10dif_generic cdrom radeon ahci crct10dif_pclmul libahci i2c_algo_bit crct10dif_common crc32c_intel ttm ehci_pci libata drm_kms_helper xhci_hcd psmouse ehci_hcd scsi_mod drm r8169 mii usbcore i2c_core usb_common fan thermal video thermal_sys button Apr 4 07:07:11 jd-dell kernel: [ 2025.042873] CPU: 1 PID: 1207 Comm: Xorg Tainted: P O 3.16.0-4-amd64 #1 Debian 3.16.7-ckt25-1 Apr 4 07:07:11 jd-dell kernel: [ 2025.042894] Hardware name: Dell Inc. Vostro 470/0NW73C, BIOS A10 10/19/2012 Apr 4 07:07:11 jd-dell kernel: [ 2025.042910] task: ffff88040a1b1530 ti: ffff88040852c000 task.ti: ffff88040852c000 Apr 4 07:07:11 jd-dell kernel: [ 2025.042927] RIP: 0010: [<ffffffffa02b2c3d>] [<ffffffffa02b2c3d>] radeon_fence_ref+0xd/0x50 [radeon] Apr 4 07:07:11 jd-dell kernel: [ 2025.042955] RSP: 0018:ffff88040852fb18 EFLAGS: 00010292 Apr 4 07:07:11 jd-dell kernel: [ 2025.042967] RAX: 0000000000000000 RBX: ffff8804091d95f8 RCX: ffff8804091d8d08 Apr 4 07:07:11 jd-dell kernel: [ 2025.042982] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000 Apr 4 07:07:11 jd-dell kernel: [ 2025.042998] RBP: ffff8804091d9550 R08: ffff8804091d8000 R09: 0000000000000000 Apr 4 07:07:11 jd-dell kernel: [ 2025.043014] R10: 0000000000000002 R11: ffff88040852fe08 R12: 0000000000000020 Apr 4 07:07:11 jd-dell kernel: [ 2025.043029] R13: ffff88040852fbe0 R14: ffff88040852fbb0 R15: ffff8804091d95f8 Apr 4 07:07:11 jd-dell kernel: [ 2025.043045] FS: 00007f0057df7980 (0000) GS:ffff88041ec40000(0000) knlGS:0000000000000000 Apr 4 07:07:11 jd-dell kernel: [ 2025.043063] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Apr 4 07:07:11 jd-dell kernel: [ 2025.043076] CR2: 0000000000000008 CR3: 000000040bce3000 CR4: 00000000001407e0 Apr 4 07:07:11 jd-dell kernel: [ 2025.043091] Stack: Apr 4 07:07:11 jd-dell kernel: [ 2025.043096] ffffffffa03130bc 002000000008d7c0 0000ee4000000100 ffff88040852fcd0 Apr 4 07:07:11 jd-dell kernel: [ 2025.043116] ffff8804091d8000 ffff88040a1b1530 ffff88040a1b1530 0000000000000001 Apr 4 07:07:11 jd-dell kernel: [ 2025.043136] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 Apr 4 07:07:11 jd-dell kernel: [ 2025.043155] Call Trace: Apr 4 07:07:11 jd-dell kernel: [ 2025.043173] [<ffffffffa03130bc>] ? radeon_sa_bo_new+0x25c/0x460 [radeon] Apr 4 07:07:11 jd-dell kernel: [ 2025.043197] [<ffffffffa02c7f3e>] ? radeon_ib_get+0x2e/0xd0 [radeon] Apr 4 07:07:11 jd-dell kernel: [ 2025.043220] [<ffffffffa02ca47c>] ? radeon_cs_ioctl+0x13c/0x730 [radeon] Apr 4 07:07:11 jd-dell kernel: [ 2025.043241] [<ffffffffa012d8b7>] ? drm_ioctl+0x1c7/0x5b0 [drm] Apr 4 07:07:11 jd-dell kernel: [ 2025.043258] [<ffffffff81057311>] ? __do_page_fault+0x1d1/0x4f0 Apr 4 07:07:11 jd-dell kernel: [ 2025.043277] [<ffffffffa0297046>] ? radeon_drm_ioctl+0x46/0x80 [radeon] Apr 4 07:07:11 jd-dell kernel: [ 2025.043294] [<ffffffff811bacdf>] ? do_vfs_ioctl+0x2cf/0x4b0 Apr 4 07:07:11 jd-dell kernel: [ 2025.043307] [<ffffffff811baf41>] ? SyS_ioctl+0x81/0xa0 Apr 4 07:07:11 jd-dell kernel: [ 2025.043321] [<ffffffff81514a0d>] ? system_call_fast_compare_end+0x10/0x15 Apr 4 07:07:11 jd-dell kernel: [ 2025.043336] Code: e4 48 8b 3b 89 c1 89 ea 48 c7 c6 80 26 3a a0 31 c0 e8 68 e7 0e e1 eb cb 66 0f 1f 44 00 00 0f 1f 44 00 00 48 89 f8 ba 01 00 00 00 <f0> 0f c1 57 08 83 c2 01 83 fa 01 7e 01 c3 80 3d 0e 43 11 00 00 Apr 4 07:07:11 jd-dell kernel: [ 2025.043444] RIP [<ffffffffa02b2c3d>] radeon_fence_ref+0xd/0x50 [radeon] Apr 4 07:07:11 jd-dell kernel: [ 2025.043476] RSP <ffff88040852fb18> Apr 4 07:07:11 jd-dell kernel: [ 2025.043484] CR2: 0000000000000008 Apr 4 07:07:11 jd-dell kernel: [ 2025.053795] ---[ end trace e697444d28a5cf65 ]---