On 2015-05-27 01:08, Phil Sutter wrote:
Hi,
On Tue, May 26, 2015 at 07:29:34PM +0100, Gordan Bobic wrote:
A bit of extra info, with cryptodev_verbosity=2, on 0.9 when the error
occurs:
cryptodev: sshd[1205]: invalid session ID=0xAADBA6A0
With 1.7:
cryptodev: sshd[1520] (fill_kcop_from_cop:647): invalid session
ID=0xEC91F39A
cryptodev: sshd[1520] (cryptodev_ioctl:857): Error copying from user
But the test code (i.e. the various *_comp programs) succeeds?
Thank you for that hint:
# cd tests
# make
./cipher
./hmac
./async_cipher
./async_hmac
./cipher-aead-srtp
ioctl(CIOCGSESSION): Invalid argument
make: *** [check] Error 1
In dmesg:
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
80f553e0
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
a2bd0180
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
a2bd06c0
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
a2bd0e40
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
a2bd0780
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
a2bd0b40
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
a2bd03c0
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
b4db8b00
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
b4db8ec0
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
b4db82c0
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
b4db8a40
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
a2bd0840
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
a2bd0600
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
a2bd0480
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
a2bd0240
cryptodev: cipher[13263] (cryptodev_open:480): allocated new item at
a2bd0c00
cryptodev: cipher[13263] (cryptodev_open:485): Cryptodev handle
initialised, 16 elements in queue
cryptodev: cipher[13263] (crypto_create_session:284): got alignmask 0
cryptodev: cipher[13263] (crypto_create_session:287): preallocating for
32 user pages
cryptodev: cipher[13263] (crypto_create_session:284): got alignmask 0
cryptodev: cipher[13263] (crypto_create_session:287): preallocating for
32 user pages
cryptodev: cipher[13263] (crypto_destroy_session:341): Removed session
0xB286F3D7
cryptodev: cipher[13263] (crypto_destroy_session:344): freeing space for
32 user pages
cryptodev: cipher[13263] (crypto_create_session:284): got alignmask 0
cryptodev: cipher[13263] (crypto_create_session:287): preallocating for
32 user pages
cryptodev: cipher[13263] (crypto_destroy_session:341): Removed session
0x781F7717
cryptodev: cipher[13263] (crypto_destroy_session:344): freeing space for
32 user pages
cryptodev: cipher[13263] (crypto_create_session:284): got alignmask 0
cryptodev: cipher[13263] (crypto_create_session:287): preallocating for
32 user pages
cryptodev: cipher[13263] (crypto_destroy_session:341): Removed session
0x89FD4E64
cryptodev: cipher[13263] (crypto_destroy_session:344): freeing space for
32 user pages
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
a2bd0c00
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
a2bd0240
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
a2bd0480
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
a2bd0600
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
a2bd0840
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
b4db8a40
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
b4db82c0
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
b4db8ec0
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
b4db8b00
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
a2bd03c0
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
a2bd0b40
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
a2bd0780
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
a2bd0e40
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
a2bd06c0
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
a2bd0180
cryptodev: cipher[13263] (cryptodev_release:519): freeing item at
80f553e0
cryptodev: cipher[13263] (crypto_destroy_session:341): Removed session
0x8AD52BF7
cryptodev: cipher[13263] (crypto_destroy_session:344): freeing space for
32 user pages
cryptodev: cipher[13263] (cryptodev_release:541): Cryptodev handle
deinitialised, 16 elements freed
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
a2bd09c0
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
a2bd00c0
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
80f553e0
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
a2bd0180
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
a2bd06c0
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
a2bd0e40
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
a2bd0780
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
a2bd0b40
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
a2bd03c0
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
b4db8b00
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
b4db8ec0
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
b4db82c0
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
b4db8a40
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
a2bd0840
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
a2bd0600
cryptodev: hmac[13264] (cryptodev_open:480): allocated new item at
a2bd0480
cryptodev: hmac[13264] (cryptodev_open:485): Cryptodev handle
initialised, 16 elements in queue
cryptodev: hmac[13264] (crypto_create_session:284): got alignmask 0
cryptodev: hmac[13264] (crypto_create_session:287): preallocating for 32
user pages
cryptodev: hmac[13264] (crypto_create_session:284): got alignmask 0
cryptodev: hmac[13264] (crypto_create_session:287): preallocating for 32
user pages
cryptodev: hmac[13264] (crypto_create_session:284): got alignmask 0
cryptodev: hmac[13264] (crypto_create_session:287): preallocating for 32
user pages
cryptodev: hmac[13264] (crypto_destroy_session:341): Removed session
0xF8E56E61
cryptodev: hmac[13264] (crypto_destroy_session:344): freeing space for
32 user pages
cryptodev: hmac[13264] (crypto_create_session:284): got alignmask 0
cryptodev: hmac[13264] (crypto_create_session:287): preallocating for 32
user pages
cryptodev: hmac[13264] (crypto_destroy_session:341): Removed session
0xDD177B60
cryptodev: hmac[13264] (crypto_destroy_session:344): freeing space for
32 user pages
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at a2bd0480
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at a2bd0600
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at a2bd0840
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at b4db8a40
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at b4db82c0
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at b4db8ec0
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at b4db8b00
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at a2bd03c0
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at a2bd0b40
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at a2bd0780
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at a2bd0e40
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at a2bd06c0
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at a2bd0180
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at 80f553e0
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at a2bd00c0
cryptodev: hmac[13264] (cryptodev_release:519): freeing item at a2bd09c0
cryptodev: hmac[13264] (crypto_destroy_session:341): Removed session
0xD0CC54B3
cryptodev: hmac[13264] (crypto_destroy_session:344): freeing space for
32 user pages
cryptodev: hmac[13264] (crypto_destroy_session:341): Removed session
0x3B07224F
cryptodev: hmac[13264] (crypto_destroy_session:344): freeing space for
32 user pages
cryptodev: hmac[13264] (cryptodev_release:541): Cryptodev handle
deinitialised, 16 elements freed
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at a2bd0240
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at a2bd0c00
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at 9af693a0
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at 9af69160
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at a2bd09c0
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at a2bd00c0
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at 80f553e0
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at a2bd0180
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at a2bd06c0
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at a2bd0e40
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at a2bd0780
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at a2bd0b40
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at a2bd03c0
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at b4db8b00
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at b4db8ec0
cryptodev: cipher-aead-srt[13267] (cryptodev_open:480): allocated new
item at b4db82c0
cryptodev: cipher-aead-srt[13267] (cryptodev_open:485): Cryptodev handle
initialised, 16 elements in queue
cryptodev: cipher-aead-srt[13267] (cryptodev_cipher_init:140): Failed to
load cipher ctr(aes)
cryptodev: cipher-aead-srt[13267] (crypto_create_session:253): Failed to
load cipher for ctr(aes)
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at b4db82c0
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at b4db8ec0
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at b4db8b00
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at a2bd03c0
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at a2bd0b40
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at a2bd0780
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at a2bd0e40
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at a2bd06c0
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at a2bd0180
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at 80f553e0
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at a2bd00c0
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at a2bd09c0
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at 9af69160
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at 9af693a0
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at a2bd0c00
cryptodev: cipher-aead-srt[13267] (cryptodev_release:519): freeing item
at a2bd0240
cryptodev: cipher-aead-srt[13267] (cryptodev_release:541): Cryptodev
handle deinitialised, 16 elements freed
This is unsurprising, since mv_cesa doesn't support ctr(aes). It doesn't
support
gcm(aes), either. But cipher-aead doesn't report any errors, but dmesg
shows
some failures:
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at b98240e0
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at b9824320
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at b9824260
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at b98243e0
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at 80fcbee0
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at 80fcbd60
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at bf2f56e0
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at bf2ed140
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at bf2ed080
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at bf2ed680
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at bf2ed5c0
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at bf2ed2c0
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at bf2ed200
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at bf2ed500
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at bf2ed440
cryptodev: cipher-aead[13404] (cryptodev_open:480): allocated new item
at a2bd0480
cryptodev: cipher-aead[13404] (cryptodev_open:485): Cryptodev handle
initialised, 16 elements in queue
cryptodev: cipher-aead[13404] (crypto_create_session:284): got alignmask
0
cryptodev: cipher-aead[13404] (crypto_create_session:287): preallocating
for 32 user pages
cryptodev: cipher-aead[13404] (crypto_create_session:284): got alignmask
0
cryptodev: cipher-aead[13404] (crypto_create_session:287): preallocating
for 32 user pages
cryptodev: cipher-aead[13404] (crypto_destroy_session:341): Removed
session 0xAFC4B57A
cryptodev: cipher-aead[13404] (crypto_destroy_session:344): freeing
space for 32 user pages
cryptodev: cipher-aead[13404] (adjust_sg_array:93): reallocating from 32
to 32 pages
cryptodev: cipher-aead[13404] (crypto_destroy_session:341): Removed
session 0x1555730D
cryptodev: cipher-aead[13404] (crypto_destroy_session:344): freeing
space for 32 user pages
cryptodev: cipher-aead[13404] (crypto_create_session:284): got alignmask
0
cryptodev: cipher-aead[13404] (crypto_create_session:287): preallocating
for 32 user pages
cryptodev: cipher-aead[13404] (crypto_destroy_session:341): Removed
session 0x03E23A0C
cryptodev: cipher-aead[13404] (crypto_destroy_session:344): freeing
space for 32 user pages
cryptodev: cipher-aead[13404] (crypto_create_session:284): got alignmask
0
cryptodev: cipher-aead[13404] (crypto_create_session:287): preallocating
for 32 user pages
cryptodev: cipher-aead[13404] (crypto_create_session:284): got alignmask
0
cryptodev: cipher-aead[13404] (crypto_create_session:287): preallocating
for 32 user pages
cryptodev: cipher-aead[13404] (crypto_destroy_session:341): Removed
session 0xDC5065E3
cryptodev: cipher-aead[13404] (crypto_destroy_session:344): freeing
space for 32 user pages
cryptodev: cipher-aead[13404] (adjust_sg_array:93): reallocating from 32
to 32 pages
cryptodev: cipher-aead[13404] (crypto_destroy_session:341): Removed
session 0xDCA8AEBA
cryptodev: cipher-aead[13404] (crypto_destroy_session:344): freeing
space for 32 user pages
cryptodev: cipher-aead[13404] (crypto_create_session:284): got alignmask
0
cryptodev: cipher-aead[13404] (crypto_create_session:287): preallocating
for 32 user pages
cryptodev: cipher-aead[13404] (adjust_sg_array:93): reallocating from 32
to 32 pages
cryptodev: cipher-aead[13404] (crypto_destroy_session:341): Removed
session 0x1FF3FD44
cryptodev: cipher-aead[13404] (crypto_destroy_session:344): freeing
space for 32 user pages
cryptodev: cipher-aead[13404] (crypto_create_session:284): got alignmask
0
cryptodev: cipher-aead[13404] (crypto_create_session:287): preallocating
for 32 user pages
cryptodev: cipher-aead[13404] (crypto_create_session:284): got alignmask
0
cryptodev: cipher-aead[13404] (crypto_create_session:287): preallocating
for 32 user pages
cryptodev: cipher-aead[13404] (crypto_destroy_session:341): Removed
session 0x0C1B3789
cryptodev: cipher-aead[13404] (crypto_destroy_session:344): freeing
space for 32 user pages
cryptodev: cipher-aead[13404] (adjust_sg_array:93): reallocating from 32
to 32 pages
cryptodev: cipher-aead[13404] (crypto_destroy_session:341): Removed
session 0x7024A518
cryptodev: cipher-aead[13404] (crypto_destroy_session:344): freeing
space for 32 user pages
cryptodev: cipher-aead[13404] (crypto_create_session:284): got alignmask
0
cryptodev: cipher-aead[13404] (crypto_create_session:287): preallocating
for 32 user pages
cryptodev: cipher-aead[13404] (adjust_sg_array:93): reallocating from 32
to 32 pages
cryptodev: cipher-aead[13404] (tls_auth_n_crypt:464): MAC verification
failed (tag_len: 20)
cryptodev: cipher-aead[13404] (crypto_auth_run:746): error in
__crypto_auth_run_zc()
cryptodev: cipher-aead[13404] (cryptodev_ioctl:876): Error in
crypto_auth_run
cryptodev: cipher-aead[13404] (crypto_destroy_session:341): Removed
session 0x2D4DF663
cryptodev: cipher-aead[13404] (crypto_destroy_session:344): freeing
space for 32 user pages
cryptodev: cipher-aead[13404] (crypto_create_session:284): got alignmask
0
cryptodev: cipher-aead[13404] (crypto_create_session:287): preallocating
for 32 user pages
cryptodev: cipher-aead[13404] (crypto_create_session:284): got alignmask
0
cryptodev: cipher-aead[13404] (crypto_create_session:287): preallocating
for 32 user pages
cryptodev: cipher-aead[13404] (crypto_destroy_session:341): Removed
session 0x4F9EA350
cryptodev: cipher-aead[13404] (crypto_destroy_session:344): freeing
space for 32 user pages
cryptodev: cipher-aead[13404] (adjust_sg_array:93): reallocating from 32
to 32 pages
cryptodev: cipher-aead[13404] (crypto_destroy_session:341): Removed
session 0xB89E1E10
cryptodev: cipher-aead[13404] (crypto_destroy_session:344): freeing
space for 32 user pages
cryptodev: cipher-aead[13404] (crypto_create_session:284): got alignmask
0
cryptodev: cipher-aead[13404] (crypto_create_session:287): preallocating
for 32 user pages
cryptodev: cipher-aead[13404] (adjust_sg_array:93): reallocating from 32
to 32 pages
cryptodev: cipher-aead[13404] (tls_auth_n_crypt:464): MAC verification
failed (tag_len: 20)
cryptodev: cipher-aead[13404] (crypto_auth_run:746): error in
__crypto_auth_run_zc()
cryptodev: cipher-aead[13404] (cryptodev_ioctl:876): Error in
crypto_auth_run
cryptodev: cipher-aead[13404] (crypto_destroy_session:341): Removed
session 0x967226D0
cryptodev: cipher-aead[13404] (crypto_destroy_session:344): freeing
space for 32 user pages
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
a2bd0480
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
bf2ed440
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
bf2ed500
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
bf2ed200
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
bf2ed2c0
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
bf2ed5c0
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
bf2ed680
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
bf2ed080
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
bf2ed140
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
bf2f56e0
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
80fcbd60
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
80fcbee0
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
b98243e0
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
b9824260
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
b9824320
cryptodev: cipher-aead[13404] (cryptodev_release:519): freeing item at
b98240e0
cryptodev: cipher-aead[13404] (cryptodev_release:541): Cryptodev handle
deinitialised, 16 elements freed
Are any of those related to the failure I was seeing, as per my original
message?
# ./cipher_comp
requested cipher CRYPTO_AES_CBC and mac CRYPTO_SHA1_HMAC, got cipher
cbc(aes) with driver mv-cbc-aes and hash with driver
# ./hash_comp
requested mac CRYPTO_SHA1, got hash sha1 with driver mv-sha1
# ./hmac_comp
requested cipher CRYPTO_AES_CBC and mac CRYPTO_SHA1_HMAC, got cipher
cbc(aes) with driver mv-cbc-aes and hash hmac(sha1) with driver
mv-hmac-sha1
fail for datalen 0x10, MACs do not match!
wrong mac:
\xd7\xd1\xa6\xef\x0a\x38\xe1\x09\x45\xe1\x8b\x48\x88\xaa\xa9\x23\x4c\xd4\x67\xd1
right mac:
\xd7\xd1\xa6\xef\x0a\x38\xe1\x09\x45\xe1\x8b\x48\x88\xaa\xa9\x23\x4c\xd4\x67\xd1
test_crypto() failed for datalen of 16
Is that a bug in the test? Those hex dumps look the same to me.
What I find really puzzling is that it is only sshd that seems to have
the
problem, and the problem arises _after_ the connection and crypto have
been
initialized since the last login message gets passed back before things
break.
I really
should take a look at the openssl integration code. Last time I did,
the
mere fact it always uses a ridiculously small (4k or so) buffer was
enough for me.
Any hints on where the root cause of the problem I am seeing might be
would
be most welcome.
Gordan
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