Fixing has stopped on Lollipop

Another fix for “The process has stopped unexpectedly…” that can (also) appear after you upgrade to Lollipop (Android 5.0) from some lower Android version without doing factory reset.

Try to uninstall “DRM Protected Content Storage” app via Settings -> Apps. In my case, this was a left-over of Android 4.3, and had some problem with it, resulting in that super annoying informative dialog…

Btw. if it doesn’t helps, and even nothing else – you’ll have to play with logcat, to discover the problem. “Simply” look for FATAL EXCEPTIONs.

Printing backtrace on SIGSEGV

New version of log-malloc2 provides new helpful functions and scripts that make backtrace printing and analyzing easy and convenient.

log-malloc2_util.h provides few fully inlined functions:

1. log_malloc_backtrace_init(void)

  • Pre-initializes backtrace() function, to avoid any later memory allocations. Use of this function is optional, but it’s good to use it on program start if you want to generate backtrace in SIGSEGV signal handler (memory allocations in SIGSEGV should be avoided if possible).

2. ssize_t log_malloc_backtrace(int fd)

  • Prints current backtrace to given file descriptor, including process memory map (/proc/self/maps) to make backtrace symbol conversion easier (this is needed because of ASLR).
  • Generated output can be directly pasted to backtrace2line script, that will convert it to human readable stack trace (ASLR is supported).

Because both functions are inlined, it is not needed to link program against log-malloc2 library, and this makes it also bit easier to use it in segfault (SIGSEGV) signal handler.

firefox 31 + self-signed certificate = sec_error_ca_cert_invalid

If you are trying to access site with self-signed certificate with Firefox 31 (or later) and get Issuer certificate is invalid error (sec_error_ca_cert_invalid), you have to disable new mozilla::pkix certificate verification.

In about:config set

security.use_mozillapkix_verification = false

To find out more about mozilla::pkix and why your firefox just got so super secure and paranoid, that it doesn’t allows you to access you own site without googling – see I’m only wondering, why did they renamed it from insanity::pkix to mozilla::pkix – do they confess that ‘mozilla’ is slowly becoming a synonym for ‘insane’ ?-) Throwing such an error without any hint or possiblity to add an exception (as usual) is IMHO insane – but, who cares about power users today…

Update: As noted in comments, this should not work in Firefox 33 (or later).

Update2: As noted by #29 and referenced bugs, there seem to be (at least) 2 major cases, where new insane::pkix will refuse to accept a https site.

  1. Your internal CA certificate doesn’t specifies CA:TRUE in X509v3 Basic Constraints section
  2. You self-signed server certificate (the last one in certificate chain) specifies CA:TRUE – what is default for certificates generated by pkitool script from easy-rsa suite – and you have your CA certificate installed in FF.

See also FF bug #1042889.

Update3: Thanks to the work of Kai Engert, there is a fix for this in Firefox 31 ESR (download from and hopefully the same comes also with Firefox 33.1.


Simple XSLT ifnull for numbers

Answer to question how to display zero instead of NaN in XSLT for non existing node containing number values (kind of ifnull or coallesce functions that are available in SQL).

You can do it by standard expressive XSLT way, with using variable and <xsl:choose>, or abuse built-in sum() function and do whole thing in one line.

Standard way:

<!– read the value –>
<xsl:variable name=”val”>
<xsl:when test=”//number[1]”><xsl:value-of select=”//number[1]”/></xsl:when>
<!– print the value out –>
<xsl:value-of select=”$val“/>


Quick way:

<!– read and printout –>
<xsl:value-of select=”sum(//number[1])“/>


Both codes will print value of first node named number or zero if the node is not present.¬† Because it is a sum() function, it’s a good idea to limit nodeset only to first one, otherwise you will get a sum of all existing number nodes.

Btw. do you know the best XSLT reference out there ? No ? Look at ZVON XSLT reference.