On Tue, 27 Aug 2019 at 15:43, Russell King - ARM Linux admin <linux@xxxxxxxxxxxxxxx> wrote: > > Hi, > > While dd'ing the contents of a SD card, I get hung task timeout > messages as per below. However, the dd is making progress. Any > ideas? > > Presumably, mmc_rescan doesn't get a look-in while IO is progressing > for the card? Is it a regression? There not much of recent mmc core and mmc block changes, that I can think of at this point. > > ARM64 host, Macchiatobin, uSD card. What mmc host driver is it? mmci? Kind regards Uffe > > Thanks. > > root@arm-d06300000000:~# dd if=/dev/mmcblk1 | md5sum > INFO: task kworker/2:1:52 blocked for more than 120 seconds. > Not tainted 5.2.0+ #309 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/2:1 D 0 52 2 0x00000028 > Workqueue: events_freezable mmc_rescan > Call trace: > __switch_to+0xb0/0x198 > __schedule+0x22c/0x604 > schedule+0x38/0xc8 > __mmc_claim_host+0xcc/0x1ec > mmc_get_card+0x30/0x3c > mmc_sd_detect+0x1c/0x78 > mmc_rescan+0x1c4/0x35c > process_one_work+0x14c/0x408 > worker_thread+0x140/0x3f4 > kthread+0xfc/0x128 > ret_from_fork+0x10/0x18 > INFO: task kworker/2:1:52 blocked for more than 120 seconds. > Not tainted 5.2.0+ #309 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/2:1 D 0 52 2 0x00000028 > Workqueue: events_freezable mmc_rescan > Call trace: > __switch_to+0xb0/0x198 > __schedule+0x22c/0x604 > schedule+0x38/0xc8 > __mmc_claim_host+0xcc/0x1ec > mmc_get_card+0x30/0x3c > mmc_sd_detect+0x1c/0x78 > mmc_rescan+0x1c4/0x35c > process_one_work+0x14c/0x408 > worker_thread+0x140/0x3f4 > kthread+0xfc/0x128 > ret_from_fork+0x10/0x18 > INFO: task kworker/2:1:52 blocked for more than 241 seconds. > Not tainted 5.2.0+ #309 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/2:1 D 0 52 2 0x00000028 > Workqueue: events_freezable mmc_rescan > Call trace: > __switch_to+0xb0/0x198 > __schedule+0x22c/0x604 > schedule+0x38/0xc8 > __mmc_claim_host+0xcc/0x1ec > mmc_get_card+0x30/0x3c > mmc_sd_detect+0x1c/0x78 > mmc_rescan+0x1c4/0x35c > process_one_work+0x14c/0x408 > worker_thread+0x140/0x3f4 > kthread+0xfc/0x128 > ret_from_fork+0x10/0x18 > INFO: task kworker/2:1:52 blocked for more than 362 seconds. > Not tainted 5.2.0+ #309 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/2:1 D 0 52 2 0x00000028 > Workqueue: events_freezable mmc_rescan > Call trace: > __switch_to+0xb0/0x198 > __schedule+0x22c/0x604 > schedule+0x38/0xc8 > __mmc_claim_host+0xcc/0x1ec > mmc_get_card+0x30/0x3c > mmc_sd_detect+0x1c/0x78 > mmc_rescan+0x1c4/0x35c > process_one_work+0x14c/0x408 > worker_thread+0x140/0x3f4 > kthread+0xfc/0x128 > ret_from_fork+0x10/0x18 > > -- > RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ > FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up > According to speedtest.net: 11.9Mbps down 500kbps up
