Got the same problem with Ubuntu 16.04 with 4.4.0-28 kernel (64bit).
Tried to copy about 60GB, stuck after a few minutes:
Jul 14 18:47:41 patsy kernel: [ 6840.370388] INFO: task mount.exfat:19269
blocked for more than 120 seconds.
Jul 14 18:47:41 patsy kernel: [ 6840.370392] Tainted: P OE
4.4.0-28-generic #47-Ubuntu
Jul 14 18:47:41 patsy kernel: [ 6840.370394] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jul 14 18:47:41 patsy kernel: [ 6840.370397] mount.exfat D ffff88080c403a08
0 19269 1 0x00000000
Jul 14 18:47:41 patsy kernel: [ 6840.370403] ffff88080c403a08 0000000000000100
ffff88080b1dac40 ffff88072da90000
Jul 14 18:47:41 patsy kernel: [ 6840.370408] ffff88080c404000 ffff880836d96d00
7fffffffffffffff ffffffff81823db0
Jul 14 18:47:41 patsy kernel: [ 6840.370413] ffff88080c403b60 ffff88080c403a20
ffffffff818235b5 0000000000000000
Jul 14 18:47:41 patsy kernel: [ 6840.370418] Call Trace:
Jul 14 18:47:41 patsy kernel: [ 6840.370425] [<ffffffff81823db0>] ?
bit_wait+0x60/0x60
Jul 14 18:47:41 patsy kernel: [ 6840.370430] [<ffffffff818235b5>]
schedule+0x35/0x80
Jul 14 18:47:41 patsy kernel: [ 6840.370436] [<ffffffff818266d5>]
schedule_timeout+0x1b5/0x270
Jul 14 18:47:41 patsy kernel: [ 6840.370443] [<ffffffff810f597c>] ?
ktime_get+0x3c/0xb0
Jul 14 18:47:41 patsy kernel: [ 6840.370449] [<ffffffff81823db0>] ?
bit_wait+0x60/0x60
Jul 14 18:47:41 patsy kernel: [ 6840.370454] [<ffffffff81822ae4>]
io_schedule_timeout+0xa4/0x110
Jul 14 18:47:41 patsy kernel: [ 6840.370460] [<ffffffff81823dcb>]
bit_wait_io+0x1b/0x70
Jul 14 18:47:41 patsy kernel: [ 6840.370466] [<ffffffff8182395d>]
__wait_on_bit+0x5d/0x90
Jul 14 18:47:41 patsy kernel: [ 6840.370471] [<ffffffff813bbba6>] ?
submit_bio+0x76/0x170
Jul 14 18:47:41 patsy kernel: [ 6840.370476] [<ffffffff81823db0>] ?
bit_wait+0x60/0x60
Jul 14 18:47:41 patsy kernel: [ 6840.370482] [<ffffffff81823a12>]
out_of_line_wait_on_bit+0x82/0xb0
Jul 14 18:47:41 patsy kernel: [ 6840.370489] [<ffffffff810c3ce0>] ?
autoremove_wake_function+0x40/0x40
Jul 14 18:47:41 patsy kernel: [ 6840.370494] [<ffffffff81245e23>]
__block_write_begin+0x263/0x480
Jul 14 18:47:41 patsy kernel: [ 6840.370499] [<ffffffff81247b80>] ?
I_BDEV+0x20/0x20
Jul 14 18:47:41 patsy kernel: [ 6840.370504] [<ffffffff81247b80>] ?
I_BDEV+0x20/0x20
Jul 14 18:47:41 patsy kernel: [ 6840.370508] [<ffffffff81246086>]
block_write_begin+0x46/0x80
Jul 14 18:47:41 patsy kernel: [ 6840.370514] [<ffffffff812486f3>]
blkdev_write_begin+0x23/0x30
Jul 14 18:47:41 patsy kernel: [ 6840.370521] [<ffffffff8118dabe>]
generic_perform_write+0xce/0x1c0
Jul 14 18:47:41 patsy kernel: [ 6840.370527] [<ffffffff8118f962>]
__generic_file_write_iter+0x1a2/0x1e0
Jul 14 18:47:41 patsy kernel: [ 6840.370532] [<ffffffff8124891f>]
blkdev_write_iter+0x8f/0x130
Jul 14 18:47:41 patsy kernel: [ 6840.370539] [<ffffffff8120c8bb>]
new_sync_write+0x9b/0xe0
Jul 14 18:47:41 patsy kernel: [ 6840.370545] [<ffffffff8120c926>]
__vfs_write+0x26/0x40
Jul 14 18:47:41 patsy kernel: [ 6840.370551] [<ffffffff8120d2a9>]
vfs_write+0xa9/0x1a0
Jul 14 18:47:41 patsy kernel: [ 6840.370556] [<ffffffff8120d1e4>] ?
vfs_read+0x114/0x130
Jul 14 18:47:41 patsy kernel: [ 6840.370563] [<ffffffff8120e115>]
SyS_pwrite64+0x95/0xb0
Jul 14 18:47:41 patsy kernel: [ 6840.370567] [<ffffffff818276b2>]
entry_SYSCALL_64_fastpath+0x16/0x71
Jul 14 18:48:34 patsy kernel: [ 6893.695042] sd 6:0:0:0: timing out command,
waited 180s
Tried it with 4.7.0-rc7, same problem.
Someone tried it with smaller buffers or less memory ?
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https://bugs.launchpad.net/bugs/1384969
Title:
Writing large amounts of data to exFAT formatted micro sdcards with
Ubuntu causes kernel errors and permanent sdcard failure.
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