Package: gcc-7 Version: 7.1.0-12 Severity: important X-Debbugs-Cc: Tyler Hicks <tyhi...@canonical.com>, Seth Arnold <seth.arn...@canonical.com>
Hi! we've debugged a FTBFS of src:apparmor on mips64el today together with our Ubuntu friends on #apparmor, and we concluded it's probably a bug somewhere in the toolchain rather than in src:apparmor: Build logs: https://buildd.debian.org/status/fetch.php?pkg=apparmor&arch=mips64el&ver=2.11.0-9&stamp=1502149450&raw=0 Reproduced on eller.debian.org. We're discussing this upstream there: https://bugs.launchpad.net/debian/+source/apparmor/+bug/1709360 Given the failure appeared after uploads/rebuilds with no source change (only AppArmor profiles were modified), it looks very much like it's caused by a change in the toolchain: gcc-7, perhaps? "Interestingly", applying a patch that merely adds debugging output (https://bugs.launchpad.net/debian/+source/apparmor/+bug/1709360/+attachment/4928923/+files/debug.patch) makes the bug disappear. The following gdb session seems to indicate that there's a toolchain bug. According to Tyler Hicks <tyhi...@ubuntu.com>: * aa_policy_cache_new() is called with max_caches equal to 1 * max_caches is not modified in aa_policy_cache_new() * yet somehow (max_caches > 1) evaluates to true eller% gdb --args ./apparmor_parser --base /tmp/aa-caching-7m80k_gp --skip-kernel-load -M tst/features_files/features.all --cache-loc /tmp/aa-caching-7m80k_gp/aa-alt-cachedf_u_391 -q --write-cache -r /tmp/aa-caching-7m80k_gp/sbin.pingy GNU gdb (Debian 7.12-6) 7.12.0.20161007-git Copyright (C) 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "mips64el-linux-gnuabi64". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from ./apparmor_parser...done. (gdb) break aa_policy_cache_new Breakpoint 1 at 0x96f70: file policy_cache.c, line 135. (gdb) run Starting program: /home/intrigeri/apparmor-2.11.0/parser/apparmor_parser --base /tmp/aa-caching-7m80k_gp --skip-kernel-load -M tst/features_files/features.all --cache-loc /tmp/aa-caching-7m80k_gp/aa-alt-cachedf_u_391 -q --write-cache -r /tmp/aa-caching-7m80k_gp/sbin.pingy [...] Breakpoint 1, aa_policy_cache_new (policy_cache=0xffffffe7d8, kernel_features=0xaaaaca22a0, dirfd=-100, path=0xaaaaca42b0 "/tmp/aa-caching-7m80k_gp/aa-alt-cachedf_u_391", max_caches=1) at policy_cache.c:135 135 return true; (gdb) s 141 int setup_cache_tmp(const char **cachetmpname, const char *cachename) (gdb) s 146 *cachetmpname = NULL; (gdb) s 147 if (write_cache) { (gdb) s 148 /* Otherwise, set up to save a cached copy */ (gdb) s (gdb) s main (argc=<optimized out>, argv=0xffffffea78) at parser_main.c:1124 1124 if (retval) { (gdb) 1125 if (errno != ENOENT && errno != EEXIST) { (gdb) s 1126 PERROR(_("Failed setting up policy cache (%s): %s\n"), (gdb) fprintf (__fmt=0xaaaac1aaa0 "Failed setting up policy cache (%s): %s\n", __stream=0xfff7eb24e8 <_IO_2_1_stderr_>) at /usr/include/mips64el-linux-gnuabi64/bits/stdio2.h:98 98 __va_arg_pack ()); (gdb) Failed setting up policy cache (/tmp/aa-caching-7m80k_gp/aa-alt-cachedf_u_391): Operation not supported main (argc=<optimized out>, argv=<optimized out>) at parser_main.c:1128 1128 return 1; (gdb) 1199 } (gdb) 0x000000fff7d386fc in __libc_start_main () from /lib/mips64el-linux-gnuabi64/libc.so.6 (gdb) Single stepping until exit from function __libc_start_main, which has no line number information. [Inferior 1 (process 609) exited with code 01]
