[kmail2] [Bug 381955] New: kmail hangs or causes desktop to hang when used with Nouveau graphics driver

[Nick]

https://bugs.kde.org/show_bug.cgi?id=381955

            Bug ID: 381955
           Summary: kmail hangs or causes desktop to hang when used with
                    Nouveau graphics driver
           Product: kmail2
           Version: 5.5.2
          Platform: Neon Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: nick.craig.law at gmail.com
  Target Milestone: ---

System Config, KDE Neon LTS 5.8.7, Nouveau driver. Nvidia GeForce GTX570M,
kmail 5.5.2.

Kmail will become unresponsive when attempting to scroll or click left on an
email. Sometimes just the controls/buttons in kmail will be unreponsive but
sometimes the whole desktop will become unreponsive and freeze, requiring a
ALT-SYSRq RSEIUB command to reboot system, ALT-F1 not working. If instead I use
the Nvidia 375 driver the problem disappears, so this problem seems to be
related to the use of the Nouveau driver. syslog reports the following errors..


Jul  2 23:02:30 nick-X681X kernel: [12787.488155] nouveau 0000:01:00.0:
kmail[8229]: Unknown handle 0x0000002c
Jul  2 23:02:30 nick-X681X kernel: [12787.488159] nouveau 0000:01:00.0:
kmail[8229]: validate_init
Jul  2 23:02:30 nick-X681X kernel: [12787.488161] nouveau 0000:01:00.0:
kmail[8229]: validate: -2
Jul  2 23:02:33 nick-X681X kernel: [12790.327435] nouveau 0000:01:00.0: gr:
TRAP ch 17 [005f1f4000 kmail[8229]]
Jul  2 23:02:33 nick-X681X kernel: [12790.327448] nouveau 0000:01:00.0: gr:
GPC0/TPC0/TEX: 80000041
Jul  2 23:02:33 nick-X681X kernel: [12790.327456] nouveau 0000:01:00.0: gr:
GPC0/TPC1/TEX: 80000041
Jul  2 23:02:33 nick-X681X kernel: [12790.327464] nouveau 0000:01:00.0: gr:
GPC0/TPC2/TEX: 80000041
Jul  2 23:02:33 nick-X681X kernel: [12790.327472] nouveau 0000:01:00.0: gr:
GPC0/TPC3/TEX: 80000041
Jul  2 23:02:33 nick-X681X kernel: [12790.327481] nouveau 0000:01:00.0: gr:
GPC1/TPC0/TEX: 80000041
Jul  2 23:02:33 nick-X681X kernel: [12790.327489] nouveau 0000:01:00.0: gr:
GPC1/TPC1/TEX: 80000041
Jul  2 23:02:33 nick-X681X kernel: [12790.327498] nouveau 0000:01:00.0: gr:
GPC1/TPC2/TEX: 80000041
Jul  2 23:02:33 nick-X681X kernel: [12790.327513] nouveau 0000:01:00.0: fifo:
read fault at 0002a0a000 engine 00 [PGRAPH] client 01 [GPC1/TEX] reason 02
[PAGE_NOT_PRESENT] on channel 17 [005f1f4000 kmail[8229]]
Jul  2 23:02:33 nick-X681X kernel: [12790.327516] nouveau 0000:01:00.0: fifo:
gr engine fault on channel 17, recovering...
Jul  2 23:03:33 nick-X681X kernel: [12850.755747] nouveau 0000:01:00.0:
kmail[8229]: failed to idle channel 17 [kmail[8229]]
Jul  2 23:03:48 nick-X681X kernel: [12865.757800] nouveau 0000:01:00.0:
kmail[8229]: failed to idle channel 17 [kmail[8229]]

It also generates a second different error on some occasions ie a FIFO read
fault at 0001afa00 engine 00 [PGRAPH] client 01 [GPC1/TEX] reason 02 [Page not
present] on channel 5.

This error tends to hang the entire desktop, hence why I have attached a photo
of the tail -f /var/log/syslog output.

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