[Intel-gfx] INFO: rcu_sched detected expedited stalls

[Hillf Danton]

On Wed, 12 Apr 2023 10:15:29 +0100 Rui Salvaterra <rsalvaterra at gmail.com>
> Hi, everyone,
> 
> I apologise in advance if I've sent this to {too many, the wrong}
> people. For some time now, I've been getting sporadic (in about one
> out of five boots) DRM-related RCU complaints on an Ivy Bridge-based
> (Core i7-3720QM) Mac Mini. Call trace (on Linux 6.3-rc6) follows:

Feel free to post again after taking a look at the popular format of
syzbot report[1].

[1] https://lore.kernel.org/lkml/000000000000f1a9d205f909f327@google.com/

> [    5.794026] rcu: INFO: rcu_sched detected expedited stalls on
> CPUs/tasks: { 0-.... } 3 jiffies s: 309 root: 0x1/.
> [    5.794044] rcu: blocking rcu_node structures (internal RCU debug):
> [    5.794045] Sending NMI from CPU 1 to CPUs 0:
> [    5.794049] NMI backtrace for cpu 0
> [    5.794051] CPU: 0 PID: 537 Comm: Xorg Not tainted 6.3.0-rc6-debug+ #57
> [    5.794053] Hardware name: Apple Inc. Macmini6,2/Mac-F65AE981FFA204ED, BIOS 429.0.0.0.0 03/18/2022