Bug 577987

Created attachment 411050 [details]
reproducer program

I have not been able to reproduce this by tracing a program included with RHEL, however, I was able to demonstrate the bug by intercepting localtime() with a pre-loaded library.  My localtime() override simply returns NULL to simulate an error.

$ LD_PRELOAD=./mylocaltime.so strace -v ./test
execve("./test", <snip>) = 0
uname({sysname="Linux", <snip>}) = 0
...
fstat(3, Segmentation fault


With the sprinttime patch from comment 0, strace handles the NULL gracefully:

$ LD_PRELOAD=./mylocaltime.so strace -v ./test
execve("./test", <snip>) = 0
uname({sysname="Linux", <snip>}) = 0
...
fstat(3, {st_dev=makedev(253, 0), st_ino=13418520, st_mode=S_IFREG|0775, st_nlink=1, st_uid=12257, st_gid=12257, st_blksize=4096, st_blocks=24, st_size=6088, st_atime=1272902720, st_mtime=1272902385, st_ctime=1272902385}) = 0
...


Attached is a tar of the mylocaltime source and the simple test program.  Build and run it with
   make
   make strace

Actually, you don't even need the test.c program from my reproducer.  Just use the mylocaltime.so library and call /usr/bin/stat on a file.

$ LD_PRELOAD=./mylocaltime.so strace -v stat /proc