[Bug 1970076] Re: "User process fault: interruption code 0011 ilc:3" on SSH client/server upon Jammy upgrade

[Christian Ehrhardt ]

(gdb) bt
#0  __GI__IO_default_xsputn (n=<optimized out>, data=<optimized out>, f=<optimized out>) at libioP.h:947
#1  __GI__IO_default_xsputn (f=0x3ffcbc7c2e8, data=<optimized out>, n=2929360903402) at genops.c:370
#2  0x000003ffa6c7896c in outstring_func (done=11, length=2929360903402, string=0x2aa0b841cea <__func__.3.lto_priv.14> "read_config_file_depth", s=0x3ffcbc7c2e8) at ../libio/libioP.h:947
#3  __vfprintf_internal (s=s at entry=0x3ffcbc7c2e8, format=<optimized out>, format at entry=0x2aa0b81dea2 "%.48s:%.48s():%d (pid=%ld)", ap=ap at entry=0x3ffcbc7c4d0, mode_flags=mode_flags at entry=2)
    at vfprintf-internal.c:1517
#4  0x000003ffa6c8a024 in __vsnprintf_internal (string=0x3ffcbc7c5c8 "readconf.c:read_config_file_depth", maxlen=<optimized out>, format=0x2aa0b81dea2 "%.48s:%.48s():%d (pid=%ld)", 
    args=args at entry=0x3ffcbc7c4d0, mode_flags=mode_flags at entry=2) at vsnprintf.c:114
#5  0x000003ffa6d2053a in ___snprintf_chk (s=<optimized out>, maxlen=<optimized out>, flag=<optimized out>, slen=<optimized out>, format=<optimized out>) at snprintf_chk.c:38
#6  0x000002aa0b7d1686 in snprintf (__fmt=0x2aa0b81dea2 "%.48s:%.48s():%d (pid=%ld)", __n=128, __s=0x3ffcbc7c5c8 "readconf.c:read_config_file_depth")
    at /usr/include/s390x-linux-gnu/bits/stdio2.h:71
#7  sshlogv (file=<optimized out>, func=<optimized out>, line=<optimized out>, showfunc=<optimized out>, level=<optimized out>, suffix=0x0, 
    fmt=0x2aa0b84162e "Reading configuration data %.200s", args=0x3ffcbc7d3b0) at ../../log.c:473
#8  0x000002aa0b7d1b88 in sshlog (file=<optimized out>, func=<optimized out>, line=<optimized out>, showfunc=<optimized out>, level=SYSLOG_LEVEL_DEBUG1, suffix=0x0, 
    fmt=0x2aa0b84162e "Reading configuration data %.200s") at ../../log.c:434
#9  0x000002aa0b80dbb6 in read_config_file_depth.constprop.0 (filename=0x2aa0b811b42 "/etc/ssh/ssh_config", pw=0x2aa0d3609d0, host=<optimized out>, original_host=<optimized out>, 
    flags=<optimized out>, activep=0x3ffcbc7d64c, want_final_pass=0x3ffcbc7e7c4, depth=0, options=<optimized out>) at ../../readconf.c:2326
#10 0x000002aa0b793d62 in read_config_file (options=0x2aa0b8518e0 <options>, want_final_pass=0x3ffcbc7e7c4, flags=0, original_host=0x2aa0d364bc0 "github.com", host=<optimized out>, 
    pw=0x2aa0d3609d0, filename=0x2aa0b811b42 "/etc/ssh/ssh_config") at ../../readconf.c:2295
#11 process_config_files (host_name=host_name at entry=0x2aa0d364bc0 "github.com", pw=pw at entry=0x2aa0d3609d0, final_pass=final_pass at entry=0, want_final_pass=want_final_pass at entry=0x3ffcbc7e7c4)
    at ../../ssh.c:569
#12 0x000002aa0b78d572 in main (ac=<optimized out>, av=<optimized out>) at ../../ssh.c:1148

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https://bugs.launchpad.net/bugs/1970076

Title:
  "User process fault: interruption code 0011 ilc:3" on SSH
  client/server upon Jammy upgrade

Status in openssh package in Ubuntu:
  New

Bug description:
  This s390x VM has been upgraded to Jammy, including the host (qemu-
  system-s390x 1:6.2+dfsg-2ubuntu6).  Now any attempt to use ssh, or any
  incoming sshd attempt immediately results in e.g.:

  ryan at s390x-dev:~$ ssh git at github.com
  [  433.672800] User process fault: interruption code 0011 ilc:3 in libc.so.6[3ffa6c00000+1ca000]
  [  433.672946] Failing address: 000002aa0b84d000 TEID: 000002aa0b84d800
  [  433.672977] Fault in primary space mode while using user ASCE.
  [  433.673030] AS:0000000002bc01c7 R3:00000000087cc007 S:000000000798a000 P:0000000000000400 
  Segmentation fault (core dumped)

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