Hi For a while now I'm seeing what looks like the same problem with Jessie. Typically after a few hours of using X the system freezes with a "BUG: soft lockup". For a few minutes I can still log in through ssh, but then that stops working as well and the system stops responding to pings. I'm also using a Radeon graphics card and see a similar stack trace in the log (exact details below). This seems to be a regression in the kernel. The solution I found was to freeze kernel updates. The last kernel that works reliably for me is 3.16.43-2+deb8u5. With all later kernels the system will hang with-in a day. In Aptitude I held packages "linux-image-3.16.0-4-amd64" (version 3.16.43-2+deb8u5) and "linux-image-amd64" (version 3.16+63) to prevent updates. This is not optimal, especially with the recent security fixes, but I plan to update this system to Stretch eventually. Best regards Tomaž Details from the crash yesterday with linux-image-3.16.0-5-amd64 (3.16.51-3+deb8u1): Excerpt from /var/log/syslog: BUG: soft lockup - CPU#3 stuck for 22s! [Xorg:1175] Modules linked in: usb_storage sha256_ssse3 sha256_generic ecb cbc algif_skcipher af_alg cpufreq_stats cpufreq_powersave cpufreq_conservative cpufreq_userspace binfmt_misc cfg80211 rfkill usblp snd_hda_codec_realtek snd_hda_codec_generic joydev radeon ttm drm_kms_helper iTCO_wdt iTCO_vendor_support drm i2c_algo_bit evdev coretemp kvm_intel snd_hda_codec_hdmi kvm snd_hda_intel snd_hda_controller snd_hda_codec shpchp snd_hwdep snd_pcm_oss i7core_edac edac_core pcspkr serio_raw snd_mixer_oss lpc_ich mfd_core snd_pcm snd_timer snd soundcore acpi_cpufreq processor button thermal_sys raid1 md_mod it87 hwmon_vid dm_crypt dm_mod fuse parport_pc ppdev lp parport autofs4 ext4 crc16 mbcache jbd2 sg sd_mod crc_t10dif crct10dif_generic crct10dif_common sr_mod cdrom ata_generic hid_generic usbhid hid crc32c_intel ahci pata_jmicron libahci i2c_i801 ehci_pci i2c_core uhci_hcd libata ehci_hcd r8169 mii scsi_mod usbcore usb_common floppy CPU: 3 PID: 1175 Comm: Xorg Not tainted 3.16.0-5-amd64 #1 Debian 3.16.51-3+deb8u1 Hardware name: Gigabyte Technology Co., Ltd. P55-UD3/P55-UD3, BIOS F5 11/20/2009 Call Trace: [<ffffffffa049df86>] ? ttm_bo_vm_fault+0x4c6/0x560 [ttm] [<ffffffffa04d601d>] ? radeon_bo_create+0x16d/0x220 [radeon] [<ffffffff812b5a27>] ? idr_mark_full+0x57/0x60 [<ffffffff812b5aa5>] ? idr_alloc+0x75/0xd0 [<ffffffffa044991a>] ? drm_gem_handle_create_tail+0xba/0x160 [drm] [<ffffffffa0499e78>] ? ttm_bo_del_sub_from_lru+0x18/0xb0 [ttm] [<ffffffffa04d4907>] ? radeon_ttm_fault+0x47/0x60 [radeon] [<ffffffff8116c81a>] ? __do_fault+0x3a/0xa0 [<ffffffff8117715c>] ? mmap_region+0x19c/0x650 [<ffffffff8116f93f>] ? do_shared_fault.isra.55+0x2f/0x1d0 [<ffffffff81170d25>] ? handle_mm_fault+0x6c5/0x1140 [<ffffffffa04b8069>] ? radeon_drm_ioctl+0x69/0x80 [radeon] [<ffffffff810594f7>] ? __do_page_fault+0x177/0x410 [<ffffffff81527e68>] ? page_fault+0x28/0x30 (there are several other stack traces in the log as well, some not apparently related to radeon) $ cat /etc/debian_version 8.10 $ cat /proc/version Linux version 3.16.0-5-amd64 (debian-kernel@lists.debian.org) (gcc version 4.8.4 (Debian 4.8.4-1) ) #1 SMP Debian 3.16.51-3+deb8u1 (2018-01-08) $ lspci|grep VGA 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV710 [Radeon HD 4350/4550] I don't have "firmware-amd-graphics" package installed. "xserver-xorg-core" installed version: 2:1.16.4-1+deb8u2
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