CVE-2023-54246

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> rcuscale: Move rcu_scale_writer() schedule_timeout_uninterruptible() to _idle()<br /> <br /> The rcuscale.holdoff module parameter can be used to delay the start<br /> of rcu_scale_writer() kthread. However, the hung-task timeout will<br /> trigger when the timeout specified by rcuscale.holdoff is greater than<br /> hung_task_timeout_secs:<br /> <br /> runqemu kvm nographic slirp qemuparams="-smp 4 -m 2048M"<br /> bootparams="rcuscale.shutdown=0 rcuscale.holdoff=300"<br /> <br /> [ 247.071753] INFO: task rcu_scale_write:59 blocked for more than 122 seconds.<br /> [ 247.072529] Not tainted 6.4.0-rc1-00134-gb9ed6de8d4ff #7<br /> [ 247.073400] "echo 0 &gt; /proc/sys/kernel/hung_task_timeout_secs" disables this message.<br /> [ 247.074331] task:rcu_scale_write state:D stack:30144 pid:59 ppid:2 flags:0x00004000<br /> [ 247.075346] Call Trace:<br /> [ 247.075660] <br /> [ 247.075965] __schedule+0x635/0x1280<br /> [ 247.076448] ? __pfx___schedule+0x10/0x10<br /> [ 247.076967] ? schedule_timeout+0x2dc/0x4d0<br /> [ 247.077471] ? __pfx_lock_release+0x10/0x10<br /> [ 247.078018] ? enqueue_timer+0xe2/0x220<br /> [ 247.078522] schedule+0x84/0x120<br /> [ 247.078957] schedule_timeout+0x2e1/0x4d0<br /> [ 247.079447] ? __pfx_schedule_timeout+0x10/0x10<br /> [ 247.080032] ? __pfx_rcu_scale_writer+0x10/0x10<br /> [ 247.080591] ? __pfx_process_timeout+0x10/0x10<br /> [ 247.081163] ? __pfx_sched_set_fifo_low+0x10/0x10<br /> [ 247.081760] ? __pfx_rcu_scale_writer+0x10/0x10<br /> [ 247.082287] rcu_scale_writer+0x6b1/0x7f0<br /> [ 247.082773] ? mark_held_locks+0x29/0xa0<br /> [ 247.083252] ? __pfx_rcu_scale_writer+0x10/0x10<br /> [ 247.083865] ? __pfx_rcu_scale_writer+0x10/0x10<br /> [ 247.084412] kthread+0x179/0x1c0<br /> [ 247.084759] ? __pfx_kthread+0x10/0x10<br /> [ 247.085098] ret_from_fork+0x2c/0x50<br /> [ 247.085433] <br /> <br /> This commit therefore replaces schedule_timeout_uninterruptible() with<br /> schedule_timeout_idle().