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SubjectRe: [PATCH] net: Fix sk_dst_check() to reset the obsolete dst_entry of a socket.
As I am testing the l2tp/ipsec client(it is working fine on 2.6.32 but
failed on 2.6.35 with the same client). Please see the following log
dump for sk_dst_check().

<2>[ 201.390289] ==== sk_dst_check sk=C7485800 dst=C717AC60
obsolete=FFFFFFFF cookie=0 check=C0296510
<2>[ 211.247467] ==== sk_dst_check sk=C7485000 dst=C717AC60
obsolete=FFFFFFFF cookie=0 check=C0296510

[Basically, the ipsec tunnel is built and then free the dst_entry for
this l2tp socket. Therefore, the obsolete entry should be reset in
sk_dst_check(). However, the kernel 2.6.35 will do nothing here since
the ipv4_dst_check still return the obsolete entry even if it is
obsolete(dst->obsolete=2)]

<2>[ 216.571350] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<6>[ 218.069396] alg: No test for authenc(hmac(sha1),cbc(des3_ede))
(authenc(hmac(sha1-generic),cbc(des3_ede-generic)))
<6>[ 218.164764] batt: 96%, 4114 mV, 0 mA (-6 avg), 27.2 C, 1305 mAh
<2>[ 218.575561] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 220.580535] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 222.585754] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 224.591522] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 226.599212] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 228.602600] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 230.608062] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 232.613464] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 234.618896] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 236.623504] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 238.628936] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 240.634338] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 242.639709] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 244.645111] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 246.648864] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 248.654693] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 250.660125] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510
<2>[ 252.665527] ==== sk_dst_check sk=C7485400 dst=C6F670E0
obsolete=00000002 cookie=0 check=C0296510


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