On 07/25/2018 02:17 PM, Jens Axboe wrote:
On 7/25/18 10:28 AM, Peter Geis wrote:
Good Afternoon,
I have encountered an issue on both Tegra 2 and Tegra 3 devices
accessing emmc following the 25 July 2018 remote tracking merge.
The offending commit is:
6ce3dd6eec114930cf2035a8bcb1e80477ed79a8
blk-mq: issue directly if hw queue isn't busy in case of 'none'.
Can you try my current for-next? This should fix it:
commit 8824f62246bef288173a6624a363352f0d4d3b09
Author: Ming Lei <ming.lei@xxxxxxxxxx>
Date: Sun Jul 22 14:10:15 2018 +0800
blk-mq: fail the request in case issue failure
That commit made the current merge window, it must be reverted before
reverting the offending commit.
With that patch, the bug triggers then the kernel waits for the mmc to
recover. It seems however that the bug leaves the mmc in a zombie state,
where it is processing the previous command but the kernel has no
control over it.
[ 4.233073] mmc0: Got command interrupt 0x00000001 even though no
command operation was in progress.
[ 4.242189] mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
[ 4.248616] mmc0: sdhci: Sys addr: 0x00000000 | Version: 0x00000001
[ 4.255041] mmc0: sdhci: Blk size: 0x00007200 | Blk cnt: 0x00000000
[ 4.261465] mmc0: sdhci: Argument: 0x002e3b10 | Trn mode: 0x00000033
[ 4.267890] mmc0: sdhci: Present: 0x1ff70000 | Host ctl: 0x00000031
[ 4.274314] mmc0: sdhci: Power: 0x0000000f | Blk gap: 0x00000000
[ 4.280737] mmc0: sdhci: Wake-up: 0x00000000 | Clock: 0x00000007
[ 4.287162] mmc0: sdhci: Timeout: 0x0000000e | Int stat: 0x00000002
[ 4.293586] mmc0: sdhci: Int enab: 0x02ff000b | Sig enab: 0x02fc000b
[ 4.300010] mmc0: sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000
[ 4.306433] mmc0: sdhci: Caps: 0xe7ffd080 | Caps_1: 0x00000074
[ 4.312857] mmc0: sdhci: Cmd: 0x0000123a | Max curr: 0x00969696
[ 4.319281] mmc0: sdhci: Resp[0]: 0x00000900 | Resp[1]: 0x04800e92
[ 4.325705] mmc0: sdhci: Resp[2]: 0x074b8000 | Resp[3]: 0x00000240
[ 4.332128] mmc0: sdhci: Host ctl2: 0x00000000
[ 4.336560] mmc0: sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0xae2f9220
[ 4.342981] mmc0: sdhci: ============================================
Without that patch, it goes into a constant loop between reading/writing
and dumping errors until it finishes booting.
