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Subject2.6.24-rc6-mm1 - oddness with IPv4/v6 mapped sockets hanging...
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I'm seeing problems with Sendmail on 24-rc6-mm1, where the main Sendmail is
listening on ::1/25, and Fetchmail connects to 127.0.0.1:25 to inject mail it
has just fetched from an outside server via IMAP - it will often just hang and
not make any further progress. Looking at netstat shows something interesting:

% netstat -n -a -A inet | grep 25
tcp 0 5108 127.0.0.1:59355 127.0.0.1:25 ESTABLISHED
% netstat -n -a -A inet6 | grep 25
tcp 0 0 :::25 :::* LISTEN
tcp 0 0 ::ffff:127.0.0.1:25 ::ffff:127.0.0.1:59355 ESTABLISHED
% netstat -n -a -A inet | grep 25
tcp 0 5108 127.0.0.1:59355 127.0.0.1:25 ESTABLISHED
% netstat -n -a -A inet6 | grep 25
tcp 0 0 :::25 :::* LISTEN
tcp 0 0 ::ffff:127.0.0.1:25 ::ffff:127.0.0.1:59355 ESTABLISHED
% netstat -n -a -A inet | grep 25
tcp 0 5108 127.0.0.1:59355 127.0.0.1:25 ESTABLISHED
% netstat -n -a -A inet6 | grep 25
tcp 0 0 :::25 :::* LISTEN
tcp 0 0 ::ffff:127.0.0.1:25 ::ffff:127.0.0.1:59355 ESTABLISHED

On the IPv4 side, it thinks it's got 5108 bytes in the send queue - but on
the IPv6 side of that same connection, it's showing 0 in the receive queue,
and we're stuck there.

It's not consistent - sometimes Fetchmail will wedge on the very first mail,
and do so several times in a row. Other times, it will do well for a while -
at the moment, it's gone through 471 of the 1,470 currently queued mails just
fine, only to get wedged again on number 472.

For what it's worth, here's what 'echo w > /proc/sysrq-trigger' got, although I
don't see anything that looks odd to me given the netstat output above -
procmail has sent data, and is waiting for a response back, and sendmail is
waiting for data to arrive:

fetchmail S ffffffff8053c520 5360 17612 9902
ffff81007d37bb08 0000000000000086 0000000000000000 000200d000000000
ffff81006bf826c0 ffffffff80687360 ffff81006bf82918 0000000000000001
0000000000000003 ffff81007d37bb88 0000000000000000 0000000000000000
Call Trace:
[<ffffffff80522682>] schedule_timeout+0x22/0xb4
[<ffffffff80523bd3>] _spin_lock_bh+0x11/0x38
[<ffffffff80523ac4>] _spin_unlock_bh+0x1e/0x20
[<ffffffff8047cec6>] release_sock+0xa3/0xac
[<ffffffff8047d98f>] sk_wait_data+0x8a/0xcf
[<ffffffff80249b99>] autoremove_wake_function+0x0/0x38
[<ffffffff804abdca>] tcp_recvmsg+0x35a/0x86b
[<ffffffff8047c7be>] sock_common_recvmsg+0x32/0x47
[<ffffffff803288be>] selinux_socket_recvmsg+0x1d/0x1f
[<ffffffff8047af38>] sock_recvmsg+0x10e/0x12f
[<ffffffff80249b99>] autoremove_wake_function+0x0/0x38
[<ffffffff8032425d>] avc_has_perm+0x4c/0x5e
[<ffffffff803ac952>] pty_write+0x3a/0x44
[<ffffffff80249dd8>] remove_wait_queue+0x2f/0x3b
[<ffffffff8047c06b>] sys_recvfrom+0xa4/0xf5
[<ffffffff8024c850>] hrtimer_start+0x11f/0x131
[<ffffffff8023aa6e>] do_setitimer+0x184/0x326
[<ffffffff8020c03b>] system_call_after_swapgs+0x7b/0x80

sendmail S ffff81007d30a400 5360 17613 16992
ffff81006bc419e8 0000000000000086 ffff81006bc41998 ffffffff8023f6a5
ffff81007d30a400 ffff81007d24f200 ffff81007d30a658 0000000100000286
ffff81006bc419e8 ffffffff8023f851 000000004789b768 ffff81000100eb20
Call Trace:
[<ffffffff8023f6a5>] lock_timer_base+0x26/0x4a
[<ffffffff8023f851>] __mod_timer+0xc4/0xd6
[<ffffffff805226ed>] schedule_timeout+0x8d/0xb4
[<ffffffff8023f37c>] process_timeout+0x0/0xb
[<ffffffff805226e8>] schedule_timeout+0x88/0xb4
[<ffffffff8029cd26>] do_select+0x4a9/0x50b
[<ffffffff8029d22d>] __pollwait+0x0/0xdf
[<ffffffff8022d7b9>] default_wake_function+0x0/0xf
[<ffffffff80523bd3>] _spin_lock_bh+0x11/0x38
[<ffffffff8047cf74>] lock_sock_nested+0xa5/0xb2
[<ffffffff80523bd3>] _spin_lock_bh+0x11/0x38
[<ffffffff80523ac4>] _spin_unlock_bh+0x1e/0x20
[<ffffffff8047cec6>] release_sock+0xa3/0xac
[<ffffffff804ac1c9>] tcp_recvmsg+0x759/0x86b
[<ffffffff8047c7be>] sock_common_recvmsg+0x32/0x47
[<ffffffff803288be>] selinux_socket_recvmsg+0x1d/0x1f
[<ffffffff8047a924>] sock_aio_read+0x121/0x139
[<ffffffff8032425d>] avc_has_perm+0x4c/0x5e
[<ffffffff8029cf7a>] core_sys_select+0x1f2/0x2a0
[<ffffffff80282f50>] page_add_new_anon_rmap+0x20/0x22
[<ffffffff803251f5>] file_has_perm+0xa5/0xb4
[<ffffffff80249b99>] autoremove_wake_function+0x0/0x38
[<ffffffff8029d45c>] sys_select+0x150/0x17b
[<ffffffff8020c03b>] system_call_after_swapgs+0x7b/0x80

Any ideas?
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