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crash just happening loga are below. I have complete iostat, latencytop and journald logs if necessary. journald seems to speak about nouveau. When the session crashed, I was just clicking on a file link in a firefox/ftp page. The computer crashed, but not completely, I could see some mouse movement after, but ctl alt backspace did not kill the session, I had to do a hard reboot. ideas welcome :-( thanks jdd last latencytop. By the way I had no usb storage active at the moment :-(: =============== Tue Dec 9 22:37:54 2014 Globals: Cause Maximum Percentage Userspace lock contention 1.3 msec 79.4 % Waiting for event (poll) 0.9 msec 13.2 % [ep_poll] 0.2 msec 7.3 % Process details: Process ksoftirqd/0 (3) Total: 5.1 msec [smpboot_thread_fn] 3.1 msec 100.0 % smpboot_thread_fn kthread ret_from_fork Process rcu_preempt (9) Total: 1540.0 msec [rcu_gp_kthread] 3.0 msec 100.0 % rcu_gp_kthread kthread ret_from_fork Process rcuop/0 (10) Total: 11.6 msec [rcu_nocb_kthread] 2.9 msec 100.0 % rcu_nocb_kthread kthread ret_from_fork Process rcuop/1 (11) Total: 21.4 msec [rcu_nocb_kthread] 3.9 msec 100.0 % rcu_nocb_kthread kthread ret_from_fork Process ksoftirqd/1 (41) Total: 5.4 msec [smpboot_thread_fn] 3.5 msec 100.0 % smpboot_thread_fn kthread ret_from_fork Process usb-storage (228) Total: 1.9 msec [usb_sg_wait] 1.8 msec 93.6 % usb_sg_wait usb_stor_bulk_transfer_sglist.part.4 [usb_storage] usb_stor_bulk_srb [usb_storage] usb_stor_Bulk_transport [usb_storage] usb_stor_invoke_transport [usb_storage] usb_stor_control_thread [usb_storage] kthread ret_from_fork Process usb-storage (247) Total: 0.2 msec [usb_stor_msg_common] 0.1 msec 100.0 % usb_stor_msg_common [usb_storage] usb_stor_bulk_transfer_buf [usb_storage] usb_stor_Bulk_transport [usb_storage] usb_stor_invoke_transport [usb_storage] usb_stor_control_thread [usb_storage] kthread ret_from_fork Process usb-storage (259) Total: 0.2 msec [usb_stor_msg_common] 0.1 msec 100.0 % usb_stor_msg_common [usb_storage] usb_stor_bulk_transfer_buf [usb_sto last iotop - I don't really know what to looka at here: il sdc 0,00 0,00 2,00 0,00 150,00 0,00 150,00 0,01 4,50 4,50 0,00 1,25 0 ,25 avg-cpu: %user %nice %system %iowait %steal %idle 19,80 0,00 29,77 0,00 0,00 50,43 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %u til sdc 0,00 0,00 0,00 0,00 0,00 0,00 0,00 0,00 0,00 0,00 0,00 0,00 0 ,00 ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ ^@^@ (full of bin garbage) ^@^@^@^@^@^@^@^@^@^@^@m/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sdc 0,00 0,00 6,50 0,00 80,00 0,00 24,62 13,00 3997,00 3997,00 0,00 153,85 100,00 journalctl of crashed session, tail: déc. 09 22:35:50 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] PGRAPH_VSTATUS2: 0x00000000 déc. 09 22:35:52 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] vm flush timeout déc. 09 22:35:52 linux-uegt kernel: nouveau W[ PFIFO][0000:01:00.0] unknown intr 0x00c00000, ch 3 déc. 09 22:35:54 linux-uegt kernel: nouveau W[ PFIFO][0000:01:00.0] unknown intr 0x00400000, ch 3 déc. 09 22:35:58 linux-uegt kernel: nouveau E[ VM][0000:01:00.0] vm flush timeout: engine 13 déc. 09 22:36:04 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] PGRAPH TLB flush idle timeout fail déc. 09 22:36:04 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] PGRAPH_STATUS : 0xffffffff BUSY DISPATCH UNK2 UNK3 UNK4 UNK5 M2MF UNK7 CTXPROG VFETCH CCACHE_PREGEOM STRMOUT_VATTR_POSTGEOM VCLIP RATTR_APLANE TRAST CLIPID ZCULL ENG2D RMASK TPC_RAST TPC_PROP TPC_TEX TPC_GEOM TPC_MP ROP (unknown bits 0xfe000000) déc. 09 22:36:04 linux-uegt kernel: nouveau W[ BARCTL][0000:01:00.0] flush timeout déc. 09 22:36:04 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] PGRAPH_VSTATUS0: 0x00000009 VFETCH CCACHE déc. 09 22:36:04 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] PGRAPH_VSTATUS1: 0x00000000 déc. 09 22:36:04 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] PGRAPH_VSTATUS2: 0x00000000 déc. 09 22:36:04 linux-uegt kernel: nouveau W[ PFIFO][0000:01:00.0] unknown intr 0x00c00000, ch 3 déc. 09 22:36:04 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] vm flush timeout déc. 09 22:36:04 linux-uegt kernel: nouveau W[ BARCTL][0000:01:00.0] flush timeout déc. 09 22:36:04 linux-uegt kernel: nouveau W[ PFIFO][0000:01:00.0] unknown intr 0x04c00000, ch 3 déc. 09 22:36:04 linux-uegt kernel: nouveau W[ BARCTL][0000:01:00.0] flush timeout déc. 09 22:36:04 linux-uegt kernel: nouveau W[ PFIFO][0000:01:00.0] unknown intr 0x04c00000, ch 3 déc. 09 22:36:04 linux-uegt rtkit-daemon[1716]: The canary thread is apparently starving. Taking action. déc. 09 22:36:04 linux-uegt rtkit-daemon[1716]: Demoting known real-time threads. déc. 09 22:36:04 linux-uegt rtkit-daemon[1716]: Successfully demoted thread 1835 of process 1715 (/usr/bin/pulseaudio). déc. 09 22:36:04 linux-uegt rtkit-daemon[1716]: Successfully demoted thread 1834 of process 1715 (/usr/bin/pulseaudio). déc. 09 22:36:04 linux-uegt rtkit-daemon[1716]: Successfully demoted thread 1833 of process 1715 (/usr/bin/pulseaudio). déc. 09 22:36:04 linux-uegt rtkit-daemon[1716]: Successfully demoted thread 1715 of process 1715 (/usr/bin/pulseaudio). déc. 09 22:36:04 linux-uegt rtkit-daemon[1716]: Demoted 4 threads. déc. 09 22:36:05 linux-uegt kernel: nouveau W[ PFIFO][0000:01:00.0] unknown intr 0x04400000, ch 3 déc. 09 22:36:08 linux-uegt kernel: nouveau E[ VM][0000:01:00.0] vm flush timeout: engine 13 déc. 09 22:36:08 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] PGRAPH TLB flush idle timeout fail déc. 09 22:36:08 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] PGRAPH_STATUS : 0x00000703 déc. 09 22:36:08 linux-uegt kernel: nouveau W[ BARCTL][0000:01:00.0] flush timeout déc. 09 22:36:08 linux-uegt kernel: BUSY DISPATCH CTXPROG VFETCH CCACHE_PREGEOM déc. 09 22:36:08 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] PGRAPH_VSTATUS0: 0x00000009 VFETCH CCACHE déc. 09 22:36:08 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] PGRAPH_VSTATUS1: 0x00000000 déc. 09 22:36:08 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] PGRAPH_VSTATUS2: 0x00000000 déc. 09 22:36:10 linux-uegt kernel: nouveau E[ PGRAPH][0000:01:00.0] vm flush timeout déc. 09 22:36:10 linux-uegt kernel: nouveau W[ PFIFO][0000:01:00.0] unknown intr 0x04c00000, ch 3 déc. 09 22:36:12 linux-uegt kernel: nouveau W[ PFIFO][0000:01:00.0] unknown intr 0x00400000, ch 3 déc. 09 22:36:30 linux-uegt org.a11y.Bus[1439]: g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). 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