I'm seeing strange issues on the Raspberry Pi B2.

[   85.426681] request_module: runaway loop modprobe binfmt-0000
[   85.428508] request_module: runaway loop modprobe binfmt-0000
[   85.449229] request_module: runaway loop modprobe binfmt-0000
[   85.449778] request_module: runaway loop modprobe binfmt-0000
[   85.472247] [<800256f8>] (warn_slowpath_null) from [<80410298>] (bcm2835_mmc_transfer_dma+0x1a8/0x1e0)
[   85.485867] [<80410298>] (bcm2835_mmc_transfer_dma) from [<80411324>] (bcm2835_mmc_request+0xa8/0xc0)
[   85.498750] [<80411324>] (bcm2835_mmc_request) from [<803f9aa8>] (mmc_start_request+0xd4/0xf8)
[   85.511034] [<803f9aa8>] (mmc_start_request) from [<803fa834>] (mmc_start_req+0x2a8/0x37c)
[   85.523053] [<803fa834>] (mmc_start_req) from [<804090a4>] (mmc_blk_issue_rw_rq+0xc8/0xafc)
[   85.535168] [<804090a4>] (mmc_blk_issue_rw_rq) from [<80409bdc>] (mmc_blk_issue_rq+0x104/0x4d8)
[   85.547683] [<80409bdc>] (mmc_blk_issue_rq) from [<8040aedc>] (mmc_queue_thread+0xb8/0x158)
[   85.559891] [<8040aedc>] (mmc_queue_thread) from [<8003ffa0>] (kthread+0xe0/0xfc)
[   85.571240] [<8003ffa0>] (kthread) from [<8000eb88>] (ret_from_fork+0x14/0x20)
[   85.580610] ---[ end trace f869ecbd2c135221 ]---
[   85.587513] EXT4-fs error (device mmcblk0p2): ext4_iget:3921: inode #5515: comm udevd: bad extra_isize (5787 != 256)
[   85.587572] mmcblk0: unknown error -5 sending read/write command, card status 0x900
[   85.587586] blk_update_request: I/O error, dev mmcblk0, sector 2048
[   95.597794] mmc0: Timeout waiting for hardware interrupt.
[   95.605645] mmcblk0: error -110 transferring data, sector 801952, nr 8, cmd response 0x900, card status 0xb00
[   95.620166] mmcblk0: retrying using single block read

This reproduces:

  • On all B2s
  • But not on A+s or B+s
  • On all of my Samsung EVO 16GB sdcards
  • But not on sdcards of other brands
  • And not on my 32GB EVO sdcard
  • Randomly (only reproducible 50% of the time)


  • Is non fatal (just cycle power, and 50% chance it'll boot normally. If not, try again)
  • Leads to permanent corruption (eventually the sdcards are left unmountable)

Steps to reproduce

  1. Download the latest Raspbian
  2. Burn to EVO sdcard with Win32 Disk Imager
  3. Put in card and apply 5V power (w/ 2.4A PSU)
  4. Pi may very well crash on first boot.

What I know

  • This person seems to be having the same issue (with details)
  • People here seem to be having mixed results with EVO cards (but details are scarce)
  • The error mentions bcm2835, but the B2 runs a bcm2836. Idk. Maybe they share MMC code? I wouldn't be surprised.

  • I know the following about the cards:

    pi@isengard ~ $ cd /sys/class/mmc_host/mmc?/mmc?:*
    pi@isengard /sys/class/mmc_host/mmc0/mmc0:59b4 $ echo "man:$(cat manfid) oem:$(cat oemid) name:$(cat name) hwrev:$(cat hwrev) fwrev:$(cat fwrev)"
    man:0x00001b oem:0x534d name:00000 hwrev:0x1 fwrev:0x0

Normally, I'd just switch to a different sdcard and move on with my life, but this is for a very large project (>200pis). I'd very much like to know what's going on, if it's fixable, and if I should start moving the project over to new hardware. If you can't help, consider an upvote. The rep will go towards a bounty.

  • 1
    I've come across this problem on all EVO-16 (Orange) Cards. However the EVO Pro Cards don't seem to suffer from this problem. I have 4 (1 Pro, 3 Orange) Pi's in a monitor matrix running and occasionally they will fail to boot. Except the one that is booting from the Pro (16GB) card. The OS is Raspbian, I haven't tried any other OS but the problem is very common on the EVO (Orange) line. Adding rootdelay to cmdline.txt does not solve this problem. Commented Jun 4, 2015 at 3:53

1 Answer 1


The problem appears to be a bug in the Raspberry Pi firmware. See raspberrypi/firmware #397.

Running sudo rpi-update to upgrade to the latest firmware will fix the issue.

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