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?
ARM64 host, Macchiatobin, uSD card.
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
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