Ubuntu
libssh package

libssh dep8 fails on ppc64el/s390x

Bug #2024064 reported by Sergio Durigan Junior on 2023-06-15

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	libssh (Ubuntu)	In Progress	High	Sebastien Bacher

Bug Description

Reporting this bug for documentation purposes. libssh's dep8 test is failing on ppc64el/s390x.

I tried reproducing it in a ppc64el canonistack box, but the test always passes there. migration-reference/0 didn't help.

It's interesting to notice that the test succeeds on debci, which leads me to believe that this is something really particular to our autopkgtest infra.

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Revision history for this message

Sebastien Bacher (seb128) wrote on 2023-07-04:

Trying on a canonistack s390x instance the tests fail after installing 0.10.5-2

the journal has that error

s390x kernel: User process fault: interruption code 0010 ilc:3 in mock-sshd[2aa2a880000+6000]
s390x kernel: Failing address: 000003ffce5ff000 TEID: 000003ffce5ff800
s390x kernel: Fault in primary space mode while using user ASCE.
s390x kernel: AS:000000004921c1c7 R3:0000000013d18007 S:0000000000000020
s390x kernel: CPU: 0 PID: 1002265 Comm: mock-sshd Not tainted 5.15.0-53-generic #59-Ubuntu
s390x kernel: Hardware name: IBM 2964 N63 400 (KVM/Linux)

Revision history for this message

Sebastien Bacher (seb128) wrote on 2023-07-04:

The kernel msg is just a sign of the program hitting an error

Doing
$ ./mock-sshd --user=bug --port 1234 -v

attaching gdb

and then issuing the client cmd
$ ssh -i test_rsa -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -p 1234 bug@localhost cat /etc/os-release

leads to this server segfault

Program received signal SIGSEGV, Segmentation fault.
0x000002aa02e02e84 in fd_data (fd=<error reading variable: Cannot access memory at address 0x3ffce57fe94>,
    revents=<error reading variable: Cannot access memory at address 0x3ffce57fe90>,
    user_data=<error reading variable: Cannot access memory at address 0x3ffce57fe88>) at mock-sshd.c:164
164 {
(gdb) bt
#0 0x000002aa02e02e84 in fd_data (fd=<error reading variable: Cannot access memory at address 0x3ffce57fe94>,
    revents=<error reading variable: Cannot access memory at address 0x3ffce57fe90>,
    user_data=<error reading variable: Cannot access memory at address 0x3ffce57fe88>) at mock-sshd.c:164
#1 0x000003ffa9b32128 in ssh_poll_ctx_dopoll (ctx=ctx@entry=0x2aa04d545a0, timeout=timeout@entry=-1)
    at /usr/src/libssh-0.10.5-2/src/poll.c:736
#2 0x000003ffa9b33732 in ssh_handle_packets (session=session@entry=0x2aa04d54ae0, timeout=timeout@entry=-1)
    at /usr/src/libssh-0.10.5-2/src/session.c:682
#3 0x000003ffa9b338e4 in ssh_handle_packets_termination (session=session@entry=0x2aa04d54ae0, timeout=<optimized out>,
    fct=fct@entry=0x3ffa9b33d30 <ssh_flush_termination>, user=user@entry=0x2aa04d54ae0)
    at /usr/src/libssh-0.10.5-2/src/session.c:751
#4 0x000003ffa9b33dc6 in ssh_blocking_flush (session=0x2aa04d54ae0, timeout=<optimized out>)
    at /usr/src/libssh-0.10.5-2/src/session.c:550
#5 0x000003ffa9b1a0dc in ssh_channel_flush (channel=0x2aa04db9bd0) at /usr/src/libssh-0.10.5-2/src/channels.c:1433
#6 ssh_channel_send_eof (channel=0x2aa04db9bd0) at /usr/src/libssh-0.10.5-2/src/channels.c:1316
...