from:"Tony Luck"

[Bug 349919] Re: ssh client sometimes hangs

2009-11-03 Thread Tony Luck

Just upgraded to 9.10 - Karmic.  Agree with Thierry Carrez that bug is
not reproducible on Karmic (3000 iterations of the "while :; do ssh
localhost date; done" loop without a hang (8.10 and 9.04 would always
hang in <100 iterations).

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ssh client sometimes hangs
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[Bug 349919] Re: ssh client sometimes hangs

2009-04-30 Thread Tony Luck

Just upgraded to 9.04 (Jaunty Jackalope).  No change in behaviour.   The

while :
do ssh localhost date
done

loop still hangs periodically (and can often be unjammed by running another
"ssh somesystem ..." in another terminal window.

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[Bug 349919] Re: ssh client sometimes hangs

2009-03-31 Thread Tony Luck

** Description changed:

  $ lsb_release -rd
  Description:  Ubuntu 8.10
  Release:  8.10
  $ apt-cache policy openssh-client
  openssh-client:
Installed: 1:5.1p1-3ubuntu1
Candidate: 1:5.1p1-3ubuntu1
Version table:
   *** 1:5.1p1-3ubuntu1 0
  500 http://us.archive.ubuntu.com intrepid/main Packages
  100 /var/lib/dpkg/status
  
  I have .ssh key files that I generated years ago.  I copied them to
  ~/.ssh on my ubuntu system. Most of the time when I use ssh to run a
  command on another system it works fine.  Once in 50 times ssh hangs
  locally.
  
  This is not a network problem ... same issue happens with "localhost".
  E.g. if I run:
  
  $ while :
  > do ssh localhost date
  > done
  
  It will print the date a few dozen times, then the loop hangs (^C
  interrupts it).
  
  I tried using strace to see what was happening.  The ssh process was hung 
reading from a socket.
  Looking back through the strace, the socket was connected to some local 
keyring thing.
  Here are some relevent lines from strace output:
  
  socket(PF_FILE, SOCK_STREAM, 0) = 4
  fcntl(4, F_SETFD, FD_CLOEXEC)   = 0
  connect(4, {sa_family=AF_FILE, path="/tmp/keyring-fed2nU/ssh"}, 110) = 0
  write(4, "\0\0\0\1", 4) = 4
  write(4, "\v", 1)   = 1
  read(4, "\0\0\2h", 4)   = 4
  read(4, "\f\0\0\0\2\0\0\0\225\0\0\0\7ssh-rsa\0\0\0\1#\0\0\0\201"..., 616) = 
616
  write(3, "$K \250\310\200\247\266-\25\257\212f\226h\234\f\275a\310"..., 64) = 
64
  select(4, [3], NULL, NULL, NULL)= 1 (in [3])
  read(3, "\34t\351\267\262/\362\315\33\r\3019\301\361dX\264\276\377"..., 8192) 
= 80
  futex(0x7f956651f2e0, 0x81 /* FUTEX_??? */, 2147483647) = 0
  futex(0x7f956651f160, 0x81 /* FUTEX_??? */, 2147483647) = 0
  futex(0x7f9567385450, 0x81 /* FUTEX_??? */, 2147483647) = 0
  futex(0x7f9567159590, 0x81 /* FUTEX_??? */, 2147483647) = 0
  futex(0x7f95671599d0, 0x81 /* FUTEX_??? */, 2147483647) = 0
  
  
  
  open("/dev/urandom", O_RDONLY)  = 5
  fstat(5, {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
  read(5, "\21\207y;\216\357\361\37\310\230\300\211GYpr\236a\235\t"..., 20) = 20
  close(5)= 0
  write(3, "\314\331h\3711\274\2...@\201\201vg\ro\230\273d\277&8X2"..., 240) = 
240
  select(4, [3], NULL, NULL, NULL)= 1 (in [3])
  read(3, "\234?r\352\30(\373T\277!bm\224W\30P\247\270\313\234\341"..., 8192) = 
192
  brk(0x7f95690d9000) = 0x7f95690d9000
  brk(0x7f95690d8000) = 0x7f95690d8000
  write(4, "\0\0\1\207", 4)   = 4
  write(4, "\r\0\0\0\225\0\0\0\7ssh-rsa\0\0\0\1#\0\0\0\201\0\300\r"..., 391) = 
391
  read(4, 0x7fff703fa880, 4)  = ? ERESTARTSYS (To be restarted)
  --- SIGINT (Interrupt) @ 0 (0) ---
  +++ killed by SIGINT +++
+ 
+ 
+ A hung ssh process is often revived when some other outging ssh request
+ is initiated.  Quite often the snoozy process wakes up and runs normally.
+ But sometimes it wakes up and reports a failed connection.

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[Bug 349919] [NEW] ssh client sometimes hangs

2009-03-27 Thread Tony Luck

Public bug reported:

$ lsb_release -rd
Description:Ubuntu 8.10
Release:8.10
$ apt-cache policy openssh-client
openssh-client:
  Installed: 1:5.1p1-3ubuntu1
  Candidate: 1:5.1p1-3ubuntu1
  Version table:
 *** 1:5.1p1-3ubuntu1 0
500 http://us.archive.ubuntu.com intrepid/main Packages
100 /var/lib/dpkg/status

I have .ssh key files that I generated years ago.  I copied them to
~/.ssh on my ubuntu system. Most of the time when I use ssh to run a
command on another system it works fine.  Once in 50 times ssh hangs
locally.

This is not a network problem ... same issue happens with "localhost".
E.g. if I run:

$ while :
> do ssh localhost date
> done

It will print the date a few dozen times, then the loop hangs (^C
interrupts it).

I tried using strace to see what was happening.  The ssh process was hung 
reading from a socket.
Looking back through the strace, the socket was connected to some local keyring 
thing.
Here are some relevent lines from strace output:

socket(PF_FILE, SOCK_STREAM, 0) = 4
fcntl(4, F_SETFD, FD_CLOEXEC)   = 0
connect(4, {sa_family=AF_FILE, path="/tmp/keyring-fed2nU/ssh"}, 110) = 0
write(4, "\0\0\0\1", 4) = 4
write(4, "\v", 1)   = 1
read(4, "\0\0\2h", 4)   = 4
read(4, "\f\0\0\0\2\0\0\0\225\0\0\0\7ssh-rsa\0\0\0\1#\0\0\0\201"..., 616) = 616
write(3, "$K \250\310\200\247\266-\25\257\212f\226h\234\f\275a\310"..., 64) = 64
select(4, [3], NULL, NULL, NULL)= 1 (in [3])
read(3, "\34t\351\267\262/\362\315\33\r\3019\301\361dX\264\276\377"..., 8192) = 
80
futex(0x7f956651f2e0, 0x81 /* FUTEX_??? */, 2147483647) = 0
futex(0x7f956651f160, 0x81 /* FUTEX_??? */, 2147483647) = 0
futex(0x7f9567385450, 0x81 /* FUTEX_??? */, 2147483647) = 0
futex(0x7f9567159590, 0x81 /* FUTEX_??? */, 2147483647) = 0
futex(0x7f95671599d0, 0x81 /* FUTEX_??? */, 2147483647) = 0



open("/dev/urandom", O_RDONLY)  = 5
fstat(5, {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
read(5, "\21\207y;\216\357\361\37\310\230\300\211GYpr\236a\235\t"..., 20) = 20
close(5)= 0
write(3, "\314\331h\3711\274\2...@\201\201vg\ro\230\273d\277&8X2"..., 240) = 240
select(4, [3], NULL, NULL, NULL)= 1 (in [3])
read(3, "\234?r\352\30(\373T\277!bm\224W\30P\247\270\313\234\341"..., 8192) = 
192
brk(0x7f95690d9000) = 0x7f95690d9000
brk(0x7f95690d8000) = 0x7f95690d8000
write(4, "\0\0\1\207", 4)   = 4
write(4, "\r\0\0\0\225\0\0\0\7ssh-rsa\0\0\0\1#\0\0\0\201\0\300\r"..., 391) = 391
read(4, 0x7fff703fa880, 4)  = ? ERESTARTSYS (To be restarted)
--- SIGINT (Interrupt) @ 0 (0) ---
+++ killed by SIGINT +++

** Affects: openssh (Ubuntu)
 Importance: Undecided
 Status: New

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ssh client sometimes hangs
https://bugs.launchpad.net/bugs/349919
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Server Team, which is subscribed to openssh in ubuntu.

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[Bug 349919] Re: ssh client sometimes hangs

[Bug 349919] Re: ssh client sometimes hangs

[Bug 349919] Re: ssh client sometimes hangs

[Bug 349919] [NEW] ssh client sometimes hangs

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