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Message-ID: <trinity-08bd09c9-b4a7-4e23-9c02-b440d21869a5-1769679293716@3c-app-mailcom-bs01>
Date: Thu, 29 Jan 2026 10:34:53 +0100
From: ysard <ysard_git@....fr>
To: Petr Mladek <pmladek@...e.com>
Cc: John Ogness <john.ogness@...utronix.de>, linux-kernel@...r.kernel.org,
senozhatsky@...omium.org
Subject: Re: Regression: system freeze on resume from suspend introduced by
printk per-console suspended state
Summary
=======
The patch works only when I *uncomment* the 2 `synchronize_srcu(&console_srcu);` lines!
With synchronize_srcu commented (as is)
=======================================
No freeze (expected):
$ sudo sh -c "
mkdir -p /var/run/nvidia-sleep \
&& echo 2 > /var/run/nvidia-sleep/Xorg.vt_number \
&& chvt 63 \
&& systemctl suspend"
Logs:
[ 378.634960] [ T2805] printk: Suspending console(s) (use no_console_suspend to debug)
[ 378.634961] [ T2805] printk: console_suspend_all
[ 378.669076] [ T2831] printk: console_trylock
[ 378.669385] [ T271] printk: console_trylock
[ 378.677075] [ T2826] printk: console_trylock
[ 378.677094] [ T2832] printk: console_trylock
[ 378.677597] [ T269] printk: console_trylock
[ 378.678842] [ T273] printk: console_trylock
[ 378.820962] [ T100] printk: console_trylock
[ 379.498727] [ T2805] printk: console_trylock
[ 379.537391] [ T2805] printk: console_trylock
[ 379.650475] [ T2805] printk: console_trylock
[ 379.650477] [ T2805] printk: console_trylock
[ 379.650478] [ T2805] printk: console_trylock
[ 379.650618] [ T2805] printk: console_trylock
[ 379.652295] [ T2805] printk: console_trylock
[ 379.654336] [ T2805] printk: console_trylock
[ 379.656435] [ T2805] printk: console_trylock
[ 379.658727] [ T2805] printk: console_trylock
[ 379.660623] [ T2805] printk: console_trylock
[ 379.662429] [ T2805] printk: console_trylock
[ 379.664265] [ T2805] printk: console_trylock
[ 379.666130] [ T2805] printk: console_trylock
[ 379.666154] [ T2805] printk: console_trylock
[ 379.666156] [ T2805] printk: console_trylock
[ 379.666607] [ T2805] printk: console_trylock
[ 379.666654] [ T2805] printk: console_trylock
[ 379.670212] [ T2805] printk: console_trylock
[ 379.670243] [ T2805] printk: console_trylock
[ 379.673828] [ T2805] printk: console_trylock
[ 379.673863] [ T2805] printk: console_trylock
[ 379.677518] [ T2805] printk: console_trylock
[ 379.677547] [ T2805] printk: console_trylock
[ 379.680645] [ T2805] printk: console_trylock
[ 379.680675] [ T2805] printk: console_trylock
[ 379.683811] [ T2805] printk: console_trylock
[ 379.683836] [ T2805] printk: console_trylock
[ 379.686960] [ T2805] printk: console_trylock
[ 379.686984] [ T2805] printk: console_trylock
[ 379.690141] [ T2805] printk: console_trylock
[ 379.693604] [ T2805] printk: console_trylock
[ 379.753022] [ T2805] printk: console_trylock
[ 379.754384] [ T2805] printk: console_trylock
[ 379.754386] [ T2831] printk: console_trylock
[ 379.754392] [ T2831] printk: console_trylock
[ 379.754395] [ T2831] printk: console_trylock
[ 379.754421] [ T2825] printk: console_trylock
[ 379.754466] [ T2829] printk: console_trylock
[ 379.754563] [ T2826] printk: console_trylock
[ 379.766769] [ T11] printk: console_lock
[ 379.766772] [ T11] printk: console_unlock
[ 380.030746] [ T2826] printk: console_trylock
[ 380.030749] [ T2825] printk: console_trylock
[ 380.072183] [ T11] printk: console_trylock
[ 380.081075] [ T271] printk: console_trylock
[ 380.081100] [ T273] printk: console_trylock
[ 380.081734] [ T273] printk: console_trylock
[ 380.082280] [ T271] printk: console_trylock
[ 380.083257] [ T271] printk: console_trylock
[ 380.083767] [ T273] printk: console_trylock
[ 380.084464] [ T271] printk: console_trylock
[ 380.086088] [ T273] printk: console_trylock
[ 380.091983] [ T334] printk: console_trylock
[ 380.094504] [ T271] printk: console_trylock
[ 380.095494] [ T271] printk: console_trylock
[ 380.096698] [ T271] printk: console_trylock
[ 380.098628] [ T11] printk: console_trylock
[ 380.099849] [ T84] printk: console_trylock
[ 380.104195] [ T271] printk: console_trylock
[ 380.104493] [ T273] printk: console_trylock
[ 380.106533] [ T273] printk: console_trylock
[ 380.108797] [ T273] printk: console_trylock
[ 380.122616] [ T273] printk: console_trylock
[ 380.158723] [ T2831] printk: console_trylock
[ 380.470807] [ T2825] printk: console_trylock
[ 380.652605] [ T2805] printk: console_resume_all
Proc comm values:
100: kworker/5:1-mm_percpu_wq
11: kworker/0:1-events
269: scsi_eh_0
271: scsi_eh_1
273: scsi_eh_2
2805: not exists or not readable
2825: not exists or not readable
2826: not exists or not readable
2829: not exists or not readable
2831: kworker/u32:17-flush-253:1
2832: not exists or not readable
334: not exists or not readable
76: kauditd
84: kworker/2:1-events
---
Freeze (as before):
$ sudo sh -c "
mkdir -p /var/run/nvidia-sleep \
&& echo 2 > /var/run/nvidia-sleep/Xorg.vt_number \
&& chvt 63 \
&& echo suspend >/proc/driver/nvidia/suspend \
&& systemctl suspend"
With synchronize_srcu uncommented
=================================
No freeze (expected):
$ sudo sh -c "
mkdir -p /var/run/nvidia-sleep \
&& echo 2 > /var/run/nvidia-sleep/Xorg.vt_number \
&& chvt 63 \
&& systemctl suspend"
Logs:
[ 97.006391] [ T2643] printk: Suspending console(s) (use no_console_suspend to debug)
[ 97.006393] [ T2643] printk: console_suspend_all
[ 97.043073] [ T2654] printk: console_trylock
[ 97.043290] [ T2655] printk: console_trylock
[ 97.043486] [ T270] printk: console_trylock
[ 97.044873] [ T272] printk: console_trylock
[ 97.067023] [ T2656] printk: console_trylock
[ 97.067403] [ T268] printk: console_trylock
[ 97.138911] [ T9] printk: console_trylock
[ 97.853561] [ T2643] printk: console_trylock
[ 97.891353] [ T2643] printk: console_trylock
[ 98.003694] [ T2643] printk: console_trylock
[ 98.003696] [ T2643] printk: console_trylock
[ 98.003697] [ T2643] printk: console_trylock
[ 98.003838] [ T2643] printk: console_trylock
[ 98.005787] [ T2643] printk: console_trylock
[ 98.008142] [ T2643] printk: console_trylock
[ 98.010180] [ T2643] printk: console_trylock
[ 98.012412] [ T2643] printk: console_trylock
[ 98.014319] [ T2643] printk: console_trylock
[ 98.016306] [ T2643] printk: console_trylock
[ 98.018004] [ T2643] printk: console_trylock
[ 98.019610] [ T2643] printk: console_trylock
[ 98.019634] [ T2643] printk: console_trylock
[ 98.019636] [ T2643] printk: console_trylock
[ 98.020082] [ T2643] printk: console_trylock
[ 98.020130] [ T2643] printk: console_trylock
[ 98.023697] [ T2643] printk: console_trylock
[ 98.023730] [ T2643] printk: console_trylock
[ 98.027334] [ T2643] printk: console_trylock
[ 98.027369] [ T2643] printk: console_trylock
[ 98.031044] [ T2643] printk: console_trylock
[ 98.031074] [ T2643] printk: console_trylock
[ 98.034191] [ T2643] printk: console_trylock
[ 98.034221] [ T2643] printk: console_trylock
[ 98.037379] [ T2643] printk: console_trylock
[ 98.037405] [ T2643] printk: console_trylock
[ 98.040576] [ T2643] printk: console_trylock
[ 98.040599] [ T2643] printk: console_trylock
[ 98.043786] [ T2643] printk: console_trylock
[ 98.047294] [ T2643] printk: console_trylock
[ 98.107363] [ T2643] printk: console_trylock
[ 98.108733] [ T2643] printk: console_trylock
[ 98.108748] [ T64] printk: console_trylock
[ 98.108751] [ T70] printk: console_trylock
[ 98.108753] [ T70] printk: console_trylock
[ 98.108862] [ T2660] printk: console_trylock
[ 98.108869] [ T2665] printk: console_trylock
[ 98.124749] [ T84] printk: console_lock
[ 98.124752] [ T84] printk: console_unlock
[ 98.384581] [ T64] printk: console_trylock
[ 98.384591] [ T2665] printk: console_trylock
[ 98.432411] [ T84] printk: console_trylock
[ 98.442955] [ T272] printk: console_trylock
[ 98.442980] [ T270] printk: console_trylock
[ 98.443315] [ T272] printk: console_trylock
[ 98.444400] [ T270] printk: console_trylock
[ 98.445386] [ T270] printk: console_trylock
[ 98.445776] [ T272] printk: console_trylock
[ 98.446591] [ T270] printk: console_trylock
[ 98.448456] [ T272] printk: console_trylock
[ 98.454112] [ T88] printk: console_trylock
[ 98.456644] [ T270] printk: console_trylock
[ 98.457620] [ T270] printk: console_trylock
[ 98.458827] [ T270] printk: console_trylock
[ 98.460353] [ T84] printk: console_trylock
[ 98.464803] [ T9] printk: console_trylock
[ 98.466327] [ T270] printk: console_trylock
[ 98.470287] [ T272] printk: console_trylock
[ 98.472759] [ T272] printk: console_trylock
[ 98.475445] [ T272] printk: console_trylock
[ 98.491793] [ T272] printk: console_trylock
[ 98.512594] [ T70] printk: console_trylock
[ 98.824640] [ T64] printk: console_trylock
[ 99.006658] [ T2643] printk: console_resume_all
Proc comm values:
2643: not exists or not readable
2654: kworker/u32:12-async
2655: kworker/u32:13-async
2656: kworker/u32:14-async
2660: kworker/u32:18-events_unbound
2665: kworker/u32:23-pm
268: scsi_eh_0
270: scsi_eh_1
272: scsi_eh_2
64: kworker/u32:1-events_unbound
70: kworker/u32:7-pm
76: kauditd
84: kworker/1:1-events
88: kworker/2:1-cgroup_free
9: kworker/0:0-events
---
Works now!:
$ sudo sh -c "
mkdir -p /var/run/nvidia-sleep \
&& echo 2 > /var/run/nvidia-sleep/Xorg.vt_number \
&& chvt 63 \
&& echo suspend >/proc/driver/nvidia/suspend \
&& systemctl suspend"
Logs:
[ 338.901995] [ T3134] printk: Suspending console(s) (use no_console_suspend to debug)
[ 338.901997] [ T3134] printk: console_suspend_all
[ 338.932763] [ T2672] printk: console_trylock
[ 338.948664] [ T2659] printk: console_trylock
[ 338.948685] [ T2671] printk: console_trylock
[ 338.950716] [ T272] printk: console_trylock
[ 338.950747] [ T270] printk: console_trylock
[ 338.982194] [ T3134] printk: console_trylock
[ 339.020910] [ T3134] printk: console_trylock
[ 339.044613] [ T158] printk: console_trylock
[ 339.132842] [ T3134] printk: console_trylock
[ 339.132843] [ T3134] printk: console_trylock
[ 339.132844] [ T3134] printk: console_trylock
[ 339.132980] [ T3134] printk: console_trylock
[ 339.134648] [ T3134] printk: console_trylock
[ 339.136741] [ T3134] printk: console_trylock
[ 339.138806] [ T3134] printk: console_trylock
[ 339.141014] [ T3134] printk: console_trylock
[ 339.142875] [ T3134] printk: console_trylock
[ 339.144627] [ T3134] printk: console_trylock
[ 339.146490] [ T3134] printk: console_trylock
[ 339.148175] [ T3134] printk: console_trylock
[ 339.148200] [ T3134] printk: console_trylock
[ 339.148201] [ T3134] printk: console_trylock
[ 339.148657] [ T3134] printk: console_trylock
[ 339.148706] [ T3134] printk: console_trylock
[ 339.152285] [ T3134] printk: console_trylock
[ 339.152318] [ T3134] printk: console_trylock
[ 339.155931] [ T3134] printk: console_trylock
[ 339.155964] [ T3134] printk: console_trylock
[ 339.159760] [ T3134] printk: console_trylock
[ 339.159792] [ T3134] printk: console_trylock
[ 339.162961] [ T3134] printk: console_trylock
[ 339.162987] [ T3134] printk: console_trylock
[ 339.166055] [ T3134] printk: console_trylock
[ 339.166079] [ T3134] printk: console_trylock
[ 339.169188] [ T3134] printk: console_trylock
[ 339.169214] [ T3134] printk: console_trylock
[ 339.172501] [ T3134] printk: console_trylock
[ 339.176003] [ T3134] printk: console_trylock
[ 339.225601] [ T3134] printk: console_trylock
[ 339.226950] [ T66] printk: console_trylock
[ 339.226954] [ T66] printk: console_trylock
[ 339.226957] [ T66] printk: console_trylock
[ 339.226964] [ T65] printk: console_trylock
[ 339.226969] [ T3134] printk: console_trylock
[ 339.227037] [ T2671] printk: console_trylock
[ 339.227045] [ T2661] printk: console_trylock
[ 339.254208] [ T9] printk: console_lock
[ 339.254214] [ T9] printk: console_unlock
[ 339.502296] [ T2673] printk: console_trylock
[ 339.506297] [ T67] printk: console_trylock
[ 339.561605] [ T272] printk: console_trylock
[ 339.561632] [ T270] printk: console_trylock
[ 339.562072] [ T272] printk: console_trylock
[ 339.563175] [ T270] printk: console_trylock
[ 339.564203] [ T270] printk: console_trylock
[ 339.564703] [ T272] printk: console_trylock
[ 339.565094] [ T272] printk: console_trylock
[ 339.565341] [ T270] printk: console_trylock
[ 339.570554] [ T1127] printk: console_trylock
[ 339.571705] [ T272] printk: console_trylock
[ 339.573017] [ T310] printk: console_trylock
[ 339.574203] [ T272] printk: console_trylock
[ 339.575888] [ T270] printk: console_trylock
[ 339.575899] [ T272] printk: console_trylock
[ 339.580570] [ T272] printk: console_trylock
[ 339.582271] [ T270] printk: console_trylock
[ 339.583508] [ T270] printk: console_trylock
[ 339.586181] [ T9] printk: console_trylock
[ 339.591087] [ T270] printk: console_trylock
[ 339.614444] [ T9] printk: console_trylock
[ 339.634304] [ T3149] printk: console_trylock
[ 339.942244] [ T2673] printk: console_trylock
[ 340.123772] [ T3134] printk: console_resume_all
Proc comm values:
1127: kworker/3:2-cgroup_offline
158: kworker/5:1-mm_percpu_wq
2659: kworker/u32:17-async
2661: kworker/u32:19-async
2671: kworker/u32:29-async
2672: kworker/u32:30-async
2673: kworker/u32:31-kvfree_rcu_reclaim
270: scsi_eh_1
272: scsi_eh_2
310: kworker/2:2-events
3134: not exists or not readable
3149: kworker/u32:38-flush-253:3
65: kworker/u32:2-async
66: kworker/u32:3-async
67: kworker/u32:4-async
9: kworker/0:0-events
---
On 2026-01-28, John Ogness wrote:
> Also, if the patch still has the problem, it would be nice to see the
> dmesg output with the patch applied when you do only the nvidia
> suspend/resume and avoid systemctl.
Unfortunately, there is no printk return under these conditions.
When searching for the names of the console_suspend/console_resume and
console_lock()/console_unlock() functions in the kms module sources,
I only found two uses of the latter, to which I added logs.
These functions are only called very early during startup and then never again;
Maybe this will help.
[ 4.967951] [ T248] NV_API_CALL: os_disable_console_access
[ 5.164823] [ T248] NV_API_CALL: os_enable_console_access
[ 6.724895] [ T248] NV_API_CALL: os_disable_console_access
[ 6.724988] [ T248] NV_API_CALL: os_enable_console_access
common/inc/nv-linux.h:
/*
* Early 2.6 kernels have acquire_console_sem, but from 2.6.38+ it was
* renamed to console_lock.
*/
#if defined(NV_ACQUIRE_CONSOLE_SEM_PRESENT)
#define NV_ACQUIRE_CONSOLE_SEM() acquire_console_sem()
#define NV_RELEASE_CONSOLE_SEM() release_console_sem()
#elif defined(NV_CONSOLE_LOCK_PRESENT)
#define NV_ACQUIRE_CONSOLE_SEM() console_lock()
#define NV_RELEASE_CONSOLE_SEM() console_unlock()
#else
#error "console lock api unrecognized!."
#endif
nvidia/os-interface.c:
NV_STATUS NV_API_CALL os_disable_console_access(void)
{
nv_printf(NV_DBG_ERRORS, "NV_API_CALL: os_disable_console_access\n");
NV_ACQUIRE_CONSOLE_SEM();
return NV_OK;
}
NV_STATUS NV_API_CALL os_enable_console_access(void)
{
nv_printf(NV_DBG_ERRORS, "NV_API_CALL: os_enable_console_access\n");
NV_RELEASE_CONSOLE_SEM();
return NV_OK;
}
Cheers
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