bug? kernel (3.10.7) panic while copying mmc partition in custom board with tx-28 module (imx28)

[Alex Gal]

Hello,

I  have a custom board with the tx-28 module (imx28).

I use kernel 3.10.7 without any patches (see attachments for the
.config and the .dts file).

The rootfs is on the usb key.

I am decompressing and copying an image on an mmc partition using this command:

gzip -d -c image.bin.gz | dd of=/dev/mmcblk0p2 bs=1M

If I lower the block size value (1024 up to 63KB), I do not get the panic.

The image file is 1.1GB decompressed and 292MB compressed.

Panic:

INFO: task kworker/u2:2:1314 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u2:2    D c05211e4     0  1314      2 0x00000000
Workqueue: kmmcd mmc_rescan
[<c05211e4>] (__schedule+0x1b0/0x424) from [<c038857c>]
(__mmc_claim_host+0xac/0x1b0)
[<c038857c>] (__mmc_claim_host+0xac/0x1b0) from [<c038f0ac>]
(mmc_sd_detect+0x20/0x74)
[<c038f0ac>] (mmc_sd_detect+0x20/0x74) from [<c038ad2c>] (mmc_rescan+0xb0/0x390)
[<c038ad2c>] (mmc_rescan+0xb0/0x390) from [<c002c81c>]
(process_one_work+0x124/0x380)
[<c002c81c>] (process_one_work+0x124/0x380) from [<c002cf04>]

The mmc card was not removed; I also tried the broken-cd; option in
the ssp0 section of the dts file.
I also disabled ssp2 but I have the same error.

Any ideas what could be going on ?

Cheers,

Alex
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INFO: task kworker/u2:2:1314 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u2:2    D c05211e4     0  1314      2 0x00000000
Workqueue: kmmcd mmc_rescan
[<c05211e4>] (__schedule+0x1b0/0x424) from [<c038857c>] (__mmc_claim_host+0xac/0x1b0)
[<c038857c>] (__mmc_claim_host+0xac/0x1b0) from [<c038f0ac>] (mmc_sd_detect+0x20/0x74)
[<c038f0ac>] (mmc_sd_detect+0x20/0x74) from [<c038ad2c>] (mmc_rescan+0xb0/0x390)
[<c038ad2c>] (mmc_rescan+0xb0/0x390) from [<c002c81c>] (process_one_work+0x124/0x380)
[<c002c81c>] (process_one_work+0x124/0x380) from [<c002cf04>] (worker_thread+0x13c/0x3d8)
[<c002cf04>] (worker_thread+0x13c/0x3d8) from [<c00326f8>] (kthread+0xa4/0xb0)
[<c00326f8>] (kthread+0xa4/0xb0) from [<c0009410>] (ret_from_fork+0x14/0x24)
Kernel panic - not syncing: hung_task: blocked tasks
CPU: 0 PID: 312 Comm: khungtaskd Not tainted 3.10.7-motsai+ #86
[<c000cd4c>] (unwind_backtrace+0x0/0xf0) from [<c000b664>] (show_stack+0x10/0x14)
[<c000b664>] (show_stack+0x10/0x14) from [<c051bf90>] (panic+0x98/0x1ec)
[<c051bf90>] (panic+0x98/0x1ec) from [<c005db14>] (watchdog+0x22c/0x258)
[<c005db14>] (watchdog+0x22c/0x258) from [<c00326f8>] (kthread+0xa4/0xb0)
[<c00326f8>] (kthread+0xa4/0xb0) from [<c0009410>] (ret_from_fork+0x14/0x24)
Rebooting in 1 seconds..

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