Hi Jack, Lindar and All, I was testing Adaptec PMC-Sierra PM8018 SAS HBA [Series 7H] card [9005:8088] with our ARM64 server SoC and occasionally saw a hang in pm8001_pci_probe. It looks like the driver was trying to read nvmd information (using get_nvmd_req) and wait for completion but the completion never happens, so I got a kernel timeout trace:
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. swapper/0 D ffffffc000086ec0 0 1 0 0x00000000 Call trace: [<ffffffc000086ec0>] __switch_to+0x90/0xb0 [<ffffffc0009e2214>] __schedule+0x204/0x670 [<ffffffc0009e26c0>] schedule+0x40/0xb0 [<ffffffc0009e549c>] schedule_timeout+0x15c/0x1b0 [<ffffffc0009e32e0>] wait_for_common+0xa0/0x150 [<ffffffc0009e33a4>] wait_for_completion+0x14/0x20 [<ffffffc00059a9cc>] pm8001_pci_probe+0xb7c/0xd10 [<ffffffc00046c7f0>] pci_device_probe+0xa0/0x120 [<ffffffc00053ff7c>] driver_probe_device+0x12c/0x2e0 [<ffffffc0005401cc>] __driver_attach+0x9c/0xa0 [<ffffffc00053e0ac>] bus_for_each_dev+0x5c/0xa0 [<ffffffc00053f8e0>] driver_attach+0x20/0x30 [<ffffffc00053f428>] bus_add_driver+0x108/0x230 [<ffffffc0005409e0>] driver_register+0x60/0x100 [<ffffffc00046b5a0>] __pci_register_driver+0x40/0x50 [<ffffffc000de3610>] pm8001_init+0x70/0xa8 [<ffffffc000082904>] do_one_initcall+0x94/0x1b0 [<ffffffc000dbcab8>] kernel_init_freeable+0x150/0x1f4 [<ffffffc0009df2c0>] kernel_init+0x10/0xf0 The current driver in kernel.org is 0.1.38, is this already the latest one? I saw in the Readme file of BIOS package in Microsemi website (http://storage.microsemi.com/en-us/downloads/bios_fw/bios_fw_ver/productid=asa-71605h&dn=adaptec+71605h.php) mentions below issue. Is the hang symptom similar to the one that I saw? 5.14 FreeBSD Hangs when No Devices on HBA On FreeBSD systems, the OS fails to boot when no devices are connected to the HBAs. WORKAROUND: Connect at least one device to the HBA to complete the boot process. Regards, Duc Dang. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
