The EINTR is not passed up, and leaves bad data in the cache as if
ecryptfs thought the files were not encrypted. This is what causes the
short writes. Getting an strace is quite difficult, but this time I
succeeded:
lstat("include/asm-ia64/ia64_int.h", {st_mode=S_IFREG|0664, st_size=12288,
...}) = 0
lstat("include/asm-ia64/init.h", {st_mode=S_IFREG|0664, st_size=12288, ...}) = 0
lstat("include/asm-ia64/init.h", {st_mode=S_IFREG|0664, st_size=12288, ...}) = 0
lstat("include/asm-ia64/iocap.h", {st_mode=S_IFREG|0664, st_size=12288, ...}) = 0
lstat("include/asm-ia64/iocap.h", {st_mode=S_IFREG|0664, st_size=12288, ...}) = 0
lstat("include/asm-ia64/linux-null/README.origin", {st_mode=S_IFREG|0664,
st_size=12288, ...}) = 0
lstat("include/asm-ia64/linux-null/README.origin", {st_mode=S_IFREG|0664,
st_size=12288, ...}) = 0
lstat("include/asm-ia64/ia64_int.h", {st_mode=S_IFREG|0664, st_size=12288,
...}) = 0
open("include/asm-ia64/ia64_int.h", O_RDONLY) = 3
read(3, "#ifndef _ASM_IA64_INT_H\n#define "..., 12288) = 2139
read(3, "", 10149) = 0
$ uname -a
Linux yakj.usersys.redhat.com 3.1.0-7.fc16.x86_64 #1 SMP Tue Nov 1 21:10:48 UTC
2011 x86_64 x86_64 x86_64 GNU/Linux
$ dmesg | tail -4
[162849.845909] ecryptfs_decrypt_page: Error attempting to read lower page; rc
= [-4]
[162849.845913] ecryptfs_readpage: Error decrypting page; rc = [-4]
[162849.845923] ecryptfs_decrypt_page: Error attempting to read lower page; rc
= [-4]
[162849.845925] ecryptfs_readpage: Error decrypting page; rc = [-4]
-4 being EINTR.
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https://bugs.launchpad.net/bugs/509180
Title:
ecryptfs sometimes seems to add trailing garbage to encrypted files
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