https://bugzilla.mindrot.org/show_bug.cgi?id=3454
Bug ID: 3454
Summary: client dies with exit code 141 (SIGPIPE) when
ControlMaster times out during
mux_client_hello_exchange()
Product: Portable OpenSSH
Version: 8.9p1
Hardware: amd64
OS: Linux
Status: NEW
Severity: normal
Priority: P5
Component: ssh
Assignee: unassigned-bugs@mindrot.org
Reporter: noamlewis+openssh-bugzilla@google.com
If the client tries to start talking to a ControlMaster just as it's
exiting (due to ControlPersist timeout), it will fail with exit code
141 (SIGPIPE).
To reproduce:
( while true; do \
sleep 0.5 ; \
gdb -ex r -ex q --args \
ssh -o ControlMaster=auto \
-o ControlPath=~/.ssh/elsa-ctrl-%C \
-o ControlPersist=1 127.0.0.1 -- touch /tmp/thingy ; \
done )
(You might need to fiddle with the sleep time)
Program received signal SIGPIPE, Broken pipe.
0x00007ffff7b38f33 in __GI___libc_write (fd=fd@entry=3,
buf=buf@entry=0x55555565e060, nbytes=nbytes@entry=12) at
../sysdeps/unix/sysv/linux/write.c:26
(gdb) bt
#0 0x00007ffff7b38f33 in __GI___libc_write (fd=fd@entry=3,
buf=buf@entry=0x55555565e060, nbytes=nbytes@entry=12) at
../sysdeps/unix/sysv/linux/write.c:26
#1 0x0000555555583380 in mux_client_write_packet (fd=fd@entry=3,
m=m@entry=0x55555565deb0) at ../../mux.c:1513
#2 0x0000555555585944 in mux_client_hello_exchange (fd=3) at
../../mux.c:1589
#3 muxclient (path=0x55555565ba60
"/home/noamlewis/.ssh/elsa-ctrl-cfbf228b3cff12162e33cbe54c12340af8f78155")
at ../../mux.c:2297
#4 0x0000555555561882 in main (ac=<optimized out>, av=<optimized out>)
at ../../ssh.c:1526
Reproduces also with older clients (8.4)
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Bug ID: 3454
Summary: client dies with exit code 141 (SIGPIPE) when
ControlMaster times out during
mux_client_hello_exchange()
Product: Portable OpenSSH
Version: 8.9p1
Hardware: amd64
OS: Linux
Status: NEW
Severity: normal
Priority: P5
Component: ssh
Assignee: unassigned-bugs@mindrot.org
Reporter: noamlewis+openssh-bugzilla@google.com
If the client tries to start talking to a ControlMaster just as it's
exiting (due to ControlPersist timeout), it will fail with exit code
141 (SIGPIPE).
To reproduce:
( while true; do \
sleep 0.5 ; \
gdb -ex r -ex q --args \
ssh -o ControlMaster=auto \
-o ControlPath=~/.ssh/elsa-ctrl-%C \
-o ControlPersist=1 127.0.0.1 -- touch /tmp/thingy ; \
done )
(You might need to fiddle with the sleep time)
Program received signal SIGPIPE, Broken pipe.
0x00007ffff7b38f33 in __GI___libc_write (fd=fd@entry=3,
buf=buf@entry=0x55555565e060, nbytes=nbytes@entry=12) at
../sysdeps/unix/sysv/linux/write.c:26
(gdb) bt
#0 0x00007ffff7b38f33 in __GI___libc_write (fd=fd@entry=3,
buf=buf@entry=0x55555565e060, nbytes=nbytes@entry=12) at
../sysdeps/unix/sysv/linux/write.c:26
#1 0x0000555555583380 in mux_client_write_packet (fd=fd@entry=3,
m=m@entry=0x55555565deb0) at ../../mux.c:1513
#2 0x0000555555585944 in mux_client_hello_exchange (fd=3) at
../../mux.c:1589
#3 muxclient (path=0x55555565ba60
"/home/noamlewis/.ssh/elsa-ctrl-cfbf228b3cff12162e33cbe54c12340af8f78155")
at ../../mux.c:2297
#4 0x0000555555561882 in main (ac=<optimized out>, av=<optimized out>)
at ../../ssh.c:1526
Reproduces also with older clients (8.4)
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