Description of problem: System appears to be crashing roughly once a day. Version-Release number of selected component (if applicable): [root@z600-localdomain ~]# uname -a Linux z600-localdomain 4.2.6-301.fc23.x86_64 #1 SMP Fri Nov 20 22:22:41 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux xorg-x11-drv-ati-7.6.0-0.4.20150729git5510cd6.fc23.x86_64 11:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV620 [FirePro 2450] (prog-if 00 [VGA controller]) Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device 2b43 Flags: bus master, fast devsel, latency 0, IRQ 31 Memory at d0000000 (64-bit, prefetchable) [size=256M] Memory at f4200000 (64-bit, non-prefetchable) [size=64K] I/O ports at d000 [size=256] [virtual] Expansion ROM at f4220000 [disabled] [size=128K] Capabilities: [50] Power Management version 3 Capabilities: [58] Express Legacy Endpoint, MSI 00 Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> Kernel driver in use: radeon Kernel modules: radeon 12:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] RV620 [FirePro 2450] Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device 2b43 Flags: bus master, fast devsel, latency 0, IRQ 32 Memory at e0000000 (64-bit, prefetchable) [size=256M] Memory at f4100000 (64-bit, non-prefetchable) [size=64K] I/O ports at e000 [size=256] Expansion ROM at f4120000 [disabled] [size=128K] Capabilities: [50] Power Management version 3 Capabilities: [58] Express Legacy Endpoint, MSI 00 Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> Kernel driver in use: radeon Kernel modules: radeon How reproducible: I'm not yet sure if their is any thing specific causing the crash. Actual results: System crashes Expected results: System not to crash. Additional info: Dec 08 11:30:59 z600-localdomain kernel: BUG: unable to handle kernel NULL pointer dereference at (null) Dec 08 11:30:59 z600-localdomain kernel: IP: [<ffffffffa01c4861>] radeon_pm_set_clocks+0xf1/0x5b0 [radeon] Dec 08 11:30:59 z600-localdomain kernel: PGD 21db19067 PUD 21db18067 PMD 0 Dec 08 11:30:59 z600-localdomain kernel: Oops: 0000 [#1] SMP Dec 08 11:30:59 z600-localdomain kernel: Modules linked in: fuse xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfil Dec 08 11:30:59 z600-localdomain kernel: snd_hda_codec joydev snd_hda_core snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer lpc_ich snd parport_pc i7core_edac parport soundc Dec 08 11:30:59 z600-localdomain kernel: CPU: 4 PID: 2272 Comm: Xorg Tainted: G I 4.2.6-301.fc23.x86_64 #1 Dec 08 11:30:59 z600-localdomain kernel: Hardware name: Hewlett-Packard HP Z600 Workstation/0B54h, BIOS 786G4 v03.13 10/13/2010 Dec 08 11:30:59 z600-localdomain kernel: task: ffff8800c3270000 ti: ffff880217260000 task.ti: ffff880217260000 Dec 08 11:30:59 z600-localdomain kernel: RIP: 0010:[<ffffffffa01c4861>] [<ffffffffa01c4861>] radeon_pm_set_clocks+0xf1/0x5b0 [radeon] Dec 08 11:30:59 z600-localdomain kernel: RSP: 0018:ffff880217263848 EFLAGS: 00010282 Dec 08 11:30:59 z600-localdomain kernel: RAX: 0000000000000000 RBX: ffff8800366bdba0 RCX: 0000000000152aa6 Dec 08 11:30:59 z600-localdomain kernel: RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8800a8d48800 Dec 08 11:30:59 z600-localdomain kernel: RBP: ffff8802172638b8 R08: ffff8802134c3c60 R09: 0000000000000000 Dec 08 11:30:59 z600-localdomain kernel: R10: 0000000000000000 R11: 000000000000a5f8 R12: ffff8800366bd4b0 Dec 08 11:30:59 z600-localdomain kernel: R13: 0000000000000000 R14: ffff8800366bdb68 R15: ffff8800366bc000 Dec 08 11:30:59 z600-localdomain kernel: FS: 00007fb341b22a00(0000) GS:ffff88032fa00000(0000) knlGS:0000000000000000 Dec 08 11:30:59 z600-localdomain kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b Dec 08 11:30:59 z600-localdomain kernel: CR2: 0000000000000000 CR3: 0000000217d79000 CR4: 00000000000006e0 Dec 08 11:30:59 z600-localdomain kernel: Stack: Dec 08 11:30:59 z600-localdomain kernel: ffff880217263868 0000000000000296 ffff880217263868 ffffffff81778e3e Dec 08 11:30:59 z600-localdomain kernel: ffff8802172638c8 ffffffff8110794d ffff8800ca0b5e30 000000009581e837 Dec 08 11:30:59 z600-localdomain kernel: 0000000000000296 ffff8800366bc000 ffff8800366bdb78 ffff880036773800 Dec 08 11:30:59 z600-localdomain kernel: Call Trace: Dec 08 11:30:59 z600-localdomain kernel: [<ffffffff81778e3e>] ? _raw_spin_unlock_irqrestore+0xe/0x10 Dec 08 11:30:59 z600-localdomain kernel: [<ffffffff8110794d>] ? mod_timer+0x13d/0x220 Dec 08 11:30:59 z600-localdomain kernel: [<ffffffffa01c5cc0>] radeon_pm_compute_clocks+0xf0/0x880 [radeon] Dec 08 11:30:59 z600-localdomain kernel: [<ffffffffa0053e97>] ? drm_vblank_put+0x87/0xc0 [drm] Dec 08 11:30:59 z600-localdomain kernel: [<ffffffffa016cfbb>] atombios_crtc_dpms+0x6b/0xf0 [radeon] Dec 08 11:30:59 z600-localdomain kernel: [<ffffffffa016d058>] atombios_crtc_commit+0x18/0x30 [radeon] Dec 08 11:30:59 z600-localdomain kernel: [<ffffffffa0142a1d>] drm_crtc_helper_set_mode+0x41d/0x520 [drm_kms_helper] Dec 08 11:30:59 z600-localdomain kernel: [<ffffffffa0143965>] drm_crtc_helper_set_config+0x925/0xaa0 [drm_kms_helper] Dec 08 11:30:59 z600-localdomain kernel: [<ffffffffa0189718>] radeon_crtc_set_config+0x48/0x120 [radeon] Dec 08 11:30:59 z600-localdomain kernel: [<ffffffffa005d306>] drm_mode_set_config_internal+0x66/0x100 [drm] Dec 08 11:30:59 z600-localdomain kernel: [<ffffffffa0061819>] drm_mode_setcrtc+0x3e9/0x500 [drm] Dec 08 11:30:59 z600-localdomain kernel: [<ffffffffa0052365>] drm_ioctl+0x125/0x610 [drm] Dec 08 11:30:59 z600-localdomain kernel: [<ffffffffa0061430>] ? drm_mode_setplane+0x1b0/0x1b0 [drm] Dec 08 11:30:59 z600-localdomain kernel: [<ffffffffa016004c>] radeon_drm_ioctl+0x4c/0x80 [radeon] Dec 08 11:30:59 z600-localdomain kernel: [<ffffffff81231445>] do_vfs_ioctl+0x295/0x470 Dec 08 11:30:59 z600-localdomain kernel: [<ffffffff813294dd>] ? selinux_file_ioctl+0x4d/0xc0 Dec 08 11:30:59 z600-localdomain kernel: [<ffffffff81231699>] SyS_ioctl+0x79/0x90 Dec 08 11:30:59 z600-localdomain kernel: [<ffffffff817793ee>] entry_SYSCALL_64_fastpath+0x12/0x71 Dec 08 11:30:59 z600-localdomain kernel: Code: 00 48 83 c4 48 5b 41 5c 41 5d 41 5e 41 5f 5d c3 49 8b bf 68 1b 00 00 4d 8d b7 68 1b 00 00 49 39 fe 74 32 4c 8b 2f eb 0f 4d 39 ee Dec 08 11:30:59 z600-localdomain kernel: RIP [<ffffffffa01c4861>] radeon_pm_set_clocks+0xf1/0x5b0 [radeon]
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