2021-07-12 Checking the rcu_sched messages finds repeated mention of cdrom scans
I was going through some rcu_sched messages and noticed kernel routines related to the cdrom drive showed up a few times in the tasks that were 'behind'.[335894.319961] [<ffffffffc03d864a>] ? scsi_execute+0x12a/0x1d0 [scsi_mod] [335894.320702] [<ffffffffc03da586>] ? scsi_execute_req_flags+0x96/0x100 [scsi_mod] [335894.321820] [<ffffffffc04a7703>] ? sr_check_events+0xc3/0x2c0 [sr_mod] [335894.322551] [<ffffffffb58224a5>] ? __switch_to_asm+0x35/0x70 [335894.323256] [<ffffffffb58224b1>] ? __switch_to_asm+0x41/0x70 [335894.323906] [<ffffffffc047d05a>] ? cdrom_check_events+0x1a/0x30 [cdrom] [335894.324545] [<ffffffffc04a8289>] ? sr_block_check_events+0x89/0xe0 [sr_mod] [335894.325186] [<ffffffffb551a9a9>] ? disk_check_events+0x69/0x150Because the virtual machines don't do anything with the virtual cdrom after the first installation I'm removing them from all virtual machines and see what that does for these messages.