I've run into this problem a few times, but it doesn't happen every time. When it happens, booting just hangs with the following messages: [ 240.302126] INFO: task swapper/0:1 blocked for more than 120 seconds. [ 240.302937] Not tainted 3.17.0-rc7-00097-g7b6ea43 #42 [ 240.308514] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 240.316350] swapper/0 D c0703960 0 1 0 0x00000000 [ 240.322667] [<c0703960>] (__schedule) from [<c070413c>] (schedule_preempt_disabled+0x14/0x20) [ 240.331159] [<c070413c>] (schedule_preempt_disabled) from [<c0706714>] (__mutex_lock_slowpath+0x190/0x3d4) [ 240.340782] [<c0706714>] (__mutex_lock_slowpath) from [<c0706964>] (mutex_lock+0xc/0x24) [ 240.348856] [<c0706964>] (mutex_lock) from [<c046a6a4>] (regmap_read+0x30/0x60) [ 240.356135] [<c046a6a4>] (regmap_read) from [<c0599e3c>] (max77686_clk_is_prepared+0x20/0x3c) [ 240.364639] [<c0599e3c>] (max77686_clk_is_prepared) from [<c059547c>] (clk_unprepare_unused_subtree+0x68/0xa0) [ 240.374607] [<c059547c>] (clk_unprepare_unused_subtree) from [<c059692c>] (clk_disable_unused+0xa8/0x138) [ 240.384146] [<c059692c>] (clk_disable_unused) from [<c00088f0>] (do_one_initcall+0x8c/0x1c4) [ 240.392561] [<c00088f0>] (do_one_initcall) from [<c099cd88>] (kernel_init_freeable+0x1a0/0x240) [ 240.401234] [<c099cd88>] (kernel_init_freeable) from [<c06fec08>] (kernel_init+0x8/0xe8) [ 240.409301] [<c06fec08>] (kernel_init) from [<c000e6b8>] (ret_from_fork+0x14/0x3c) [ 240.416830] INFO: task kworker/u8:0:6 blocked for more than 120 seconds. [ 240.423505] Not tainted 3.17.0-rc7-00097-g7b6ea43 #42 [ 240.429050] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 240.436858] kworker/u8:0 D c0703960 0 6 2 0x00000000 [ 240.443194] Workqueue: kmmcd mmc_rescan [ 240.447015] [<c0703960>] (__schedule) from [<c070413c>] (schedule_preempt_disabled+0x14/0x20) [ 240.455520] [<c070413c>] (schedule_preempt_disabled) from [<c0706714>] (__mutex_lock_slowpath+0x190/0x3d4) [ 240.465146] [<c0706714>] (__mutex_lock_slowpath) from [<c0706964>] (mutex_lock+0xc/0x24) [ 240.473215] [<c0706964>] (mutex_lock) from [<c0595880>] (clk_prepare_lock+0x88/0xfc) [ 240.480930] [<c0595880>] (clk_prepare_lock) from [<c05971c8>] (clk_unprepare+0x1c/0x2c) [ 240.488916] [<c05971c8>] (clk_unprepare) from [<c05288cc>] (s3c24xx_i2c_xfer+0x170/0x3d4) [ 240.497063] [<c05288cc>] (s3c24xx_i2c_xfer) from [<c05233f8>] (__i2c_transfer+0x78/0x90) [ 240.505125] [<c05233f8>] (__i2c_transfer) from [<c0523d90>] (i2c_transfer+0x94/0xc4) [ 240.512846] [<c0523d90>] (i2c_transfer) from [<c046ecd4>] (regmap_i2c_read+0x48/0x64) [ 240.520654] [<c046ecd4>] (regmap_i2c_read) from [<c046ab8c>] (_regmap_raw_read+0x98/0xf4) [ 240.528804] [<c046ab8c>] (_regmap_raw_read) from [<c046ac0c>] (_regmap_bus_read+0x24/0x5c) [ 240.537040] [<c046ac0c>] (_regmap_bus_read) from [<c046a5fc>] (_regmap_read+0x6c/0xe4) [ 240.544932] [<c046a5fc>] (_regmap_read) from [<c046a6b4>] (regmap_read+0x40/0x60) [ 240.552391] [<c046a6b4>] (regmap_read) from [<c03e9a04>] (regulator_get_voltage_sel_regmap+0x20/0x54) [ 240.561593] [<c03e9a04>] (regulator_get_voltage_sel_regmap) from [<c03e4ec4>] (_regulator_get_voltage+0x20/0xb4) [ 240.571747] [<c03e4ec4>] (_regulator_get_voltage) from [<c03e4e8c>] (regulator_get_voltage+0x1c/0x34) [ 240.580932] [<c03e4e8c>] (regulator_get_voltage) from [<c0562960>] (mmc_regulator_set_ocr+0x44/0x128) [ 240.590129] [<c0562960>] (mmc_regulator_set_ocr) from [<c057678c>] (sdhci_do_set_ios+0x130/0x5fc) [ 240.598968] [<c057678c>] (sdhci_do_set_ios) from [<c0576c80>] (sdhci_set_ios+0x28/0x34) [ 240.606951] [<c0576c80>] (sdhci_set_ios) from [<c0569f10>] (mmc_sd_init_card+0x454/0x664) [ 240.615097] [<c0569f10>] (mmc_sd_init_card) from [<c056a320>] (mmc_attach_sd+0x84/0x150) [ 240.623161] [<c056a320>] (mmc_attach_sd) from [<c0564a0c>] (mmc_rescan+0x2a0/0x308) [ 240.630796] [<c0564a0c>] (mmc_rescan) from [<c003b1c4>] (process_one_work+0x128/0x318) [ 240.638688] [<c003b1c4>] (process_one_work) from [<c003b998>] (worker_thread+0x44/0x4dc) [ 240.646757] [<c003b998>] (worker_thread) from [<c003fa1c>] (kthread+0xd0/0xe8) [ 240.653958] [<c003fa1c>] (kthread) from [<c000e6b8>] (ret_from_fork+0x14/0x3c) [ 360.657146] INFO: task swapper/0:1 blocked for more than 120 seconds. [ 360.657952] Not tainted 3.17.0-rc7-00097-g7b6ea43 #42 [ 360.663526] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 360.671336] swapper/0 D c0703960 0 1 0 0x00000000 [ 360.677679] [<c0703960>] (__schedule) from [<c070413c>] (schedule_preempt_disabled+0x14/0x20) [ 360.686175] [<c070413c>] (schedule_preempt_disabled) from [<c0706714>] (__mutex_lock_slowpath+0x190/0x3d4) [ 360.695796] [<c0706714>] (__mutex_lock_slowpath) from [<c0706964>] (mutex_lock+0xc/0x24) [ 360.703869] [<c0706964>] (mutex_lock) from [<c046a6a4>] (regmap_read+0x30/0x60) [ 360.711149] [<c046a6a4>] (regmap_read) from [<c0599e3c>] (max77686_clk_is_prepared+0x20/0x3c) [ 360.719653] [<c0599e3c>] (max77686_clk_is_prepared) from [<c059547c>] (clk_unprepare_unused_subtree+0x68/0xa0) [ 360.729627] [<c059547c>] (clk_unprepare_unused_subtree) from [<c059692c>] (clk_disable_unused+0xa8/0x138) [ 360.739164] [<c059692c>] (clk_disable_unused) from [<c00088f0>] (do_one_initcall+0x8c/0x1c4) [ 360.747577] [<c00088f0>] (do_one_initcall) from [<c099cd88>] (kernel_init_freeable+0x1a0/0x240) [ 360.756252] [<c099cd88>] (kernel_init_freeable) from [<c06fec08>] (kernel_init+0x8/0xe8) [ 360.764317] [<c06fec08>] (kernel_init) from [<c000e6b8>] (ret_from_fork+0x14/0x3c) [ 360.771852] INFO: task kworker/u8:0:6 blocked for more than 120 seconds. [ 360.778522] Not tainted 3.17.0-rc7-00097-g7b6ea43 #42 [ 360.784067] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 360.791876] kworker/u8:0 D c0703960 0 6 2 0x00000000 [ 360.798211] Workqueue: kmmcd mmc_rescan [ 360.802033] [<c0703960>] (__schedule) from [<c070413c>] (schedule_preempt_disabled+0x14/0x20) [ 360.810537] [<c070413c>] (schedule_preempt_disabled) from [<c0706714>] (__mutex_lock_slowpath+0x190/0x3d4) [ 360.820160] [<c0706714>] (__mutex_lock_slowpath) from [<c0706964>] (mutex_lock+0xc/0x24) [ 360.828233] [<c0706964>] (mutex_lock) from [<c0595880>] (clk_prepare_lock+0x88/0xfc) [ 360.835949] [<c0595880>] (clk_prepare_lock) from [<c05971c8>] (clk_unprepare+0x1c/0x2c) [ 360.843936] [<c05971c8>] (clk_unprepare) from [<c05288cc>] (s3c24xx_i2c_xfer+0x170/0x3d4) [ 360.852079] [<c05288cc>] (s3c24xx_i2c_xfer) from [<c05233f8>] (__i2c_transfer+0x78/0x90) [ 360.860143] [<c05233f8>] (__i2c_transfer) from [<c0523d90>] (i2c_transfer+0x94/0xc4) [ 360.867865] [<c0523d90>] (i2c_transfer) from [<c046ecd4>] (regmap_i2c_read+0x48/0x64) [ 360.875674] [<c046ecd4>] (regmap_i2c_read) from [<c046ab8c>] (_regmap_raw_read+0x98/0xf4) [ 360.883819] [<c046ab8c>] (_regmap_raw_read) from [<c046ac0c>] (_regmap_bus_read+0x24/0x5c) [ 360.892058] [<c046ac0c>] (_regmap_bus_read) from [<c046a5fc>] (_regmap_read+0x6c/0xe4) [ 360.899949] [<c046a5fc>] (_regmap_read) from [<c046a6b4>] (regmap_read+0x40/0x60) [ 360.907409] [<c046a6b4>] (regmap_read) from [<c03e9a04>] (regulator_get_voltage_sel_regmap+0x20/0x54) [ 360.916610] [<c03e9a04>] (regulator_get_voltage_sel_regmap) from [<c03e4ec4>] (_regulator_get_voltage+0x20/0xb4) [ 360.926764] [<c03e4ec4>] (_regulator_get_voltage) from [<c03e4e8c>] (regulator_get_voltage+0x1c/0x34) [ 360.935951] [<c03e4e8c>] (regulator_get_voltage) from [<c0562960>] (mmc_regulator_set_ocr+0x44/0x128) [ 360.945146] [<c0562960>] (mmc_regulator_set_ocr) from [<c057678c>] (sdhci_do_set_ios+0x130/0x5fc) [ 360.953987] [<c057678c>] (sdhci_do_set_ios) from [<c0576c80>] (sdhci_set_ios+0x28/0x34) [ 360.961967] [<c0576c80>] (sdhci_set_ios) from [<c0569f10>] (mmc_sd_init_card+0x454/0x664) [ 360.970114] [<c0569f10>] (mmc_sd_init_card) from [<c056a320>] (mmc_attach_sd+0x84/0x150) [ 360.978179] [<c056a320>] (mmc_attach_sd) from [<c0564a0c>] (mmc_rescan+0x2a0/0x308) [ 360.985813] [<c0564a0c>] (mmc_rescan) from [<c003b1c4>] (process_one_work+0x128/0x318) [ 360.993705] [<c003b1c4>] (process_one_work) from [<c003b998>] (worker_thread+0x44/0x4dc) [ 361.001773] [<c003b998>] (worker_thread) from [<c003fa1c>] (kthread+0xd0/0xe8) [ 361.008977] [<c003fa1c>] (kthread) from [<c000e6b8>] (ret_from_fork+0x14/0x3c) Best Regards Shixin Zeng -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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