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Re: lightdm (testing): Long waiting time after login

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On 19/05/18 09:59, Ben Caradoc-Davies wrote:
> I can reproduce the hang in a VM with a testing system installed from 
> the 14 May weekly testing iso. I will try using a custom kernel with a 
> printk in getrandom to confirm the guilty process, as I did for #897572.

The cause is xfce4-session. I will file a bug report.

Test kernel:
Linux getrandom-testing 4.16.0-1-amd64 #1 SMP Debian 
4.16.5-1+getrandom+printk+dump+stack (2018-05-08) x86_64 GNU/Linux

This kernel is 4.16.5-1 plus these two patches (against torvalds/linux 
master but they apply cleanly against the stable tree):
https://github.com/bencaradocdavies/linux/commit/f0dfb0b7b72e38093aeaa67fe1116b409c1db3dc
https://github.com/bencaradocdavies/linux/commit/19e47d7049c6ca94b98cf8c00bbeb2384a9c43b9
https://github.com/bencaradocdavies/linux/tree/getrandom-printk-dump-stack

The evidence seen in the journalctl when booting with "debug" and not 
"quiet" on the kernel command line:

May 19 11:09:39 getrandom-testing kernel: random: xfce4-session: 
getrandom without GRND_NONBLOCK while crng not ready
May 19 11:09:39 getrandom-testing kernel: CPU: 0 PID: 587 Comm: 
xfce4-session Not tainted 4.16.0-1-amd64 #1 Debian 
4.16.5-1+getrandom+printk+dump+stack
May 19 11:09:39 getrandom-testing kernel: Hardware name: QEMU Standard 
PC (i440FX + PIIX, 1996), BIOS 1.11.1-1 04/01/2014
May 19 11:09:39 getrandom-testing kernel: Call Trace:
May 19 11:09:39 getrandom-testing kernel:  dump_stack+0x5c/0x85
May 19 11:09:39 getrandom-testing kernel:  SyS_getrandom+0xab/0xc0
May 19 11:09:39 getrandom-testing kernel:  do_syscall_64+0x6c/0x130
May 19 11:09:39 getrandom-testing kernel: 
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
May 19 11:09:39 getrandom-testing kernel: RIP: 0033:0x7fdb3e1038f9
May 19 11:09:39 getrandom-testing kernel: RSP: 002b:00007ffd434e7ba8 
EFLAGS: 00000246 ORIG_RAX: 000000000000013e
May 19 11:09:39 getrandom-testing kernel: RAX: ffffffffffffffda RBX: 
0000000000000028 RCX: 00007fdb3e1038f9
May 19 11:09:39 getrandom-testing kernel: RDX: 0000000000000000 RSI: 
0000000000000028 RDI: 00007ffd434e7cb0
May 19 11:09:39 getrandom-testing kernel: RBP: 00007fdb41e02a00 R08: 
0000000000000000 R09: 0000000000000000
May 19 11:09:39 getrandom-testing kernel: R10: 00007fdb3d4f0140 R11: 
0000000000000246 R12: 00007ffd434e7cb0
May 19 11:09:39 getrandom-testing kernel: R13: 0000000000000002 R14: 
0000000000000010 R15: 0000558569895400

Kind regards,

-- 
Ben Caradoc-Davies <ben@transient.nz>
Director
Transient Software Limited <https://transient.nz/>
New Zealand

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Thread

Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-17 00:50 +0200
  Re: lightdm (testing): Long waiting time after login Dino <work@hllmnn.de> - 2018-05-17 11:10 +0200
    Re: lightdm (testing): Long waiting time after login Curt <curty@free.fr> - 2018-05-17 12:10 +0200
    Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-18 01:10 +0200
      Re: lightdm (testing): Long waiting time after login Dino <work@hllmnn.de> - 2018-05-18 08:50 +0200
        Re: lightdm (testing): Long waiting time after login songbird <songbird@anthive.com> - 2018-05-18 12:10 +0200
          Re: lightdm (testing): Long waiting time after login Dino <work@hllmnn.de> - 2018-05-18 16:00 +0200
            Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-19 00:10 +0200
              Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-19 01:30 +0200
                Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-19 03:10 +0200
                Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-21 05:30 +0200
                Re: lightdm (testing): Long waiting time after login Dino <work@hllmnn.de> - 2018-05-22 10:00 +0200
                Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-23 00:50 +0200
                Re: lightdm (testing): Long waiting time after login Glenn English <ghe2001@gmail.com> - 2018-05-23 18:50 +0200
                Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-24 00:20 +0200
                Re: lightdm (testing): Long waiting time after login Glenn English <ghe2001@gmail.com> - 2018-05-24 15:50 +0200
                Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-25 00:30 +0200

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