Hello, I got a kernel trace when unplugging the power supply, switching to battery mode. I get the same kernel trace when booting on battery. Both making the system unusable or breaking the boot. The kernel call trace with symbols: ? blk_mq_requeue_request+0x... ? __scsi_queue_insert+0x... ? ata_scsi_var_len_cdb_xlat+0x ? __blk_mq_complete_request+0x... ? ata_scsi_translate+0x... ? ata_scsi_queuecmd+0x... ? scsi_dispatch_cmd+0x... ? scsi_queue_rq+0x... ? blk_mq_dispatch_rq_list+0x... ? kyber_dispatch_cur_domain+0x... ? kyber_completed_request+0x... ? blk_mq_sched_dispatch_requests+0x... ? __ blk_mq_run_hw_queue+0x... ? __blk_mq_delay_run_hw_queue+0x... ? blk_mq_run_hw_queue+0x... ? blk_mq_run_hw_queues+0x... ? blk_mq_requeue_work+0x... ? process_one_work+0x... ? worker_thread+0x... ? process_one_work+0x... ? kthread+0x... ? kthread_flush_work_fn+0x... ? ret_from_fork+0x... Code: ... RIP: sbitmap_queue_clear+0x... Screenshot: https://ibin.co/4D34Ej3DWsqI.jpg Kernel config: https://bpaste.net/show/870004e55123 Kernel: 4.17.11-ck Setup: btrfs-on-bcache-on-luks btrfs options (rw,noatime,nodiratime,compress- force=lzo,nossd,noacl,space_cache,autodefrag) Using mq bfq scheduler for the hdd backing and kyber for the ssd caching device Failed tests: Tested many kernel down to 4.13.2 with Gentoo or Ck patchset. Sorry for not including the vanilla sources in the test, I can provide if required. Skipping services in the boot process didn't help, any next service leads to the same trace. Switching off the laptop-mode-tools daemon didn't help. Switching all devices to "none" scheduler did not help. Workaround: After some tests and due to the *mq* call stack I was able to workaround by disabling CONFIG_SCSI_MQ_DEFAULT and CONFIG_DM_MQ_DEFAULT and switching all devices to cfq scheduler. However with the MQ enabled kernel, only bfq, kyber and none are possible, while the non-mq kernel can only set cfq. I guess this is intentional as the current bfq implementation is a MQ only version and CFQ is a non-mq only version? Best regards, Massimo
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