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Command perf test 86 fails on s390: # perf test -F 86 ping 868299 [007] 28248.013596: probe_libc:inet_pton_1: (3ff95948020) 3ff95948020 inet_pton+0x0 (inlined) 3ff9595e6e7 text_to_binary_address+0x1007 (inlined) 3ff9595e6e7 gaih_inet+0x1007 (inlined) FAIL: expected backtrace entry \ "main\+0x[[:xdigit:]]+[[:space:]]\(.*/bin/ping.*\)$" got "3ff9595e6e7 gaih_inet+0x1007 (inlined)" 86: probe libc's inet_pton & backtrace it with ping : FAILED! # The root cause is a new stack layout, two functions have been added as seen below. # perf script | tac | grep -m1 '^ping' -B9 | tac ping 866856 [007] 25979.494921: probe_libc:inet_pton: (3ff8ec48020) 3ff8ec48020 inet_pton+0x0 (inlined) new --> 3ff8ec5e6e7 text_to_binary_address+0x1007 (inlined) new --> 3ff8ec5e6e7 gaih_inet+0x1007 (inlined) 3ff8ec5e6e7 getaddrinfo+0x1007 (/usr/lib64/libc.so.6) 2aa3fe04bf5 main+0xff5 (/usr/bin/ping) 3ff8eb34a5b __libc_start_call_main+0x8b (/usr/lib64/libc.so.6) 3ff8eb34b5d __libc_start_main@GLIBC_2.2+0xad (inlined) 2aa3fe06a1f [unknown] (/usr/bin/ping) # The new functions in the call chain are: - text_to_binary_address() - gaih_inet(). Both functions are inlined and do not show up in the output of the nm command: # nm -a /usr/lib64/libc.so.6 | \ grep -E '(text_to_binary_address|gaih_inet)$' # There is no possibility to add these 2 functions depending on their existance in the C library. Add text_to_binary_address() and gaih_inet() to the list of expected functions in an compatible way and extend the regular expression. On s390 the backtrace can now be Before After probe_libc:inet_pton probe_libc:inet_pton inet_pton inet_pton getaddrinfo getaddrinfo | text_to_binary_address main main | gaih_inet Output after: # perf test -F 86 86: probe libc's inet_pton & backtrace it with ping : Ok # Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Cc: agordeev@linux.ibm.com Cc: gor@linux.ibm.com Cc: hca@linux.ibm.com Cc: sumanthk@linux.ibm.com Link: https://lore.kernel.org/r/20241001124224.3370306-1-tmricht@linux.ibm.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.