Possible fix for: Workqueue: events_freezable mmc_rescan

[ChrisLanks]

raspberrypi/linux#2810 (comment)

Nov 15 07:04:18 raspberrypi kernel: [282129.766119] Workqueue: events_freezable mmc_rescan
Nov 15 07:04:18 raspberrypi kernel: [282129.766139] [<8085d70c>] (__schedule) from [<8085dd7c>] (schedule+0x50/0xa8)
Nov 15 07:04:18 raspberrypi kernel: [282129.766151] [<8085dd7c>] (schedule) from [<806b16f8>] (__mmc_claim_host+0x120/0x228)
Nov 15 07:04:18 raspberrypi kernel: [282129.766161] [<806b16f8>] (__mmc_claim_host) from [<806b1838>] (mmc_get_card+0x38/0x3c)
Nov 15 07:04:18 raspberrypi kernel: [282129.766171] [<806b1838>] (mmc_get_card) from [<806ba8a4>] (mmc_sd_detect+0x24/0x7c)
Nov 15 07:04:18 raspberrypi kernel: [282129.766182] [<806ba8a4>] (mmc_sd_detect) from [<806b3e60>] (mmc_rescan+0x1cc/0x39c)
Nov 15 07:04:18 raspberrypi kernel: [282129.766192] [<806b3e60>] (mmc_rescan) from [<8013c44c>] (process_one_work+0x170/0x458)
Nov 15 07:04:18 raspberrypi kernel: [282129.766202] [<8013c44c>] (process_one_work) from [<8013c790>] (worker_thread+0x5c/0x5a4)
Nov 15 07:04:18 raspberrypi kernel: [282129.766210] [<8013c790>] (worker_thread) from [<80142ac4>] (kthread+0x138/0x168)
Nov 15 07:04:18 raspberrypi kernel: [282129.766219] [<80142ac4>] (kthread) from [<801010ac>] (ret_from_fork+0x14/0x28)
Nov 15 07:04:18 raspberrypi kernel: [282129.766223] Exception stack(0x93e95fb0 to 0x93e95ff8)
Nov 15 07:04:18 raspberrypi kernel: [282129.766229] 5fa0:                                     00000000 00000000 00000000 00000000
Nov 15 07:04:18 raspberrypi kernel: [282129.766235] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
Nov 15 07:04:18 raspberrypi kernel: [282129.766241] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
Nov 15 07:06:22 raspberrypi kernel: [282252.645841] kworker/3:0     D    0 16947      2 0x00000000
Nov 15 07:06:22 raspberrypi kernel: [282252.645872] Workqueue: events_freezable mmc_rescan
Nov 15 07:06:22 raspberrypi kernel: [282252.645905] [<8085d70c>] (__schedule) from [<8085dd7c>] (schedule+0x50/0xa8)
Nov 15 07:06:22 raspberrypi kernel: [282252.645928] [<8085dd7c>] (schedule) from [<806b16f8>] (__mmc_claim_host+0x120/0x228)

[ChrisLanks]

sudo sysctl -w vm.dirty_ratio=10
sudo sysctl -w vm.dirty_background_ratio=5
sudo sysctl -p

[ChrisLanks]

Seems to have fixed this issue