Greetings! Aside from Andrew's last request, I see that a very similar issue was discussed on LP# 1881109 [0] but, at that time, tests with a later kernel didn't reproduce the issue.
You're running 5.4.0-71 there. Have you been able to reproduce this using either 5.4.0-73 or 5.4.0-74 (the latter in Proposed, only)? Thanks! [0] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1881109 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1929923 Title: [UBUNTU 20.04] LPAR becomes unresponsive after the Kernel panic - rq_qos_wake_function Status in Ubuntu on IBM z Systems: New Status in linux package in Ubuntu: New Bug description: ---Problem Description--- kernel panic rq_qos_wake_function ---uname output--- Linux version 5.4.0-71-generic Machine Type = s390x ---Debugger--- A debugger is not configured Stack trace output: May 15 20:21:04 data1 kernel: Call Trace: May 15 20:21:04 data1 kernel: ([<000000234091e670>] 0x234091e670) May 15 20:21:04 data1 kernel: [<0000003e10047e3a>] rq_qos_wake_function+0x8a/0xa0 May 15 20:21:04 data1 kernel: [<0000003e0fbec482>] __wake_up_common+0xa2/0x1b0 May 15 20:21:04 data1 kernel: [<0000003e0fbec984>] __wake_up_common_lock+0x94/0xe0 May 15 20:21:04 data1 kernel: [<0000003e0fbec9fa>] __wake_up+0x2a/0x40 May 15 20:21:04 data1 kernel: [<0000003e1005ee70>] wbt_done+0x90/0xe0 May 15 20:21:04 data1 kernel: [<0000003e10047f42>] __rq_qos_done+0x42/0x60 May 15 20:21:04 data1 kernel: [<0000003e10033cb0>] blk_mq_free_request+0xe0/0x140 May 15 20:21:04 data1 kernel: [<0000003e101d46f0>] dm_softirq_done+0x140/0x230 May 15 20:21:04 data1 kernel: [<0000003e100326c0>] blk_done_softirq+0xc0/0xe0 May 15 20:21:04 data1 kernel: [<0000003e103fc084>] __do_softirq+0x104/0x360 May 15 20:21:04 data1 kernel: [<0000003e0fb9da1e>] irq_exit+0x9e/0xc0 May 15 20:21:04 data1 kernel: [<0000003e0fb28ae8>] do_IRQ+0x78/0xb0 May 15 20:21:04 data1 kernel: [<0000003e103fb588>] ext_int_handler+0x130/0x134 May 15 20:21:04 data1 kernel: [<0000003e101d4416>] dm_mq_queue_rq+0x36/0x1d0 May 15 20:21:04 data1 kernel: Last Breaking-Event-Address: May 15 20:21:04 data1 kernel: [<0000003e0fbce75e>] wake_up_process+0xe/0x20 May 15 20:21:04 data1 kernel: Kernel panic - not syncing: Fatal exception in interrupt Oops output: no System Dump Info: The system was configured to capture a dump, however a dump was not produced. -Attach sysctl -a output output to the bug. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1929923/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
