On Thu, Dec 3, 2009 at 9:47 PM, John David Anglin <dave@xxxxxxxxxxxxxxxxxx> wrote: >> Yes, it's not make's fault, it's waiting for the read to complete. >> What is the process on the other side of the pipe? > > Thanks for explaining the inode numbers. > > The process on the other side is /bin/sh: > > root@hiauly6:/proc/14971# ps -ef|grep 14971 > dave 14971 1 0 Dec01 ? 00:00:00 /bin/sh > > It's fd's are: > > root@hiauly6:/proc/14971/fd# ls -l > total 0 > lr-x------ 1 dave dave 64 Dec 3 21:20 0 -> pipe:[1401596] > l-wx------ 1 dave dave 64 Dec 3 21:20 1 -> pipe:[1401597] > l-wx------ 1 dave dave 64 Dec 3 21:20 2 -> /home/dave/gnu/gcc-4.5/objdir/build.log > lr-x------ 1 dave dave 64 Dec 3 21:20 3 -> pipe:[1383769] > l-wx------ 1 dave dave 64 Dec 3 21:20 4 -> pipe:[1383769] > lr-x------ 1 dave dave 64 Dec 3 21:20 5 -> /usr/include/sys/stat.h > lr-x------ 1 dave dave 64 Dec 3 21:20 6 -> pipe:[1401596] > l-wx------ 1 dave dave 64 Dec 3 21:20 7 -> pipe:[1401596] > l-wx------ 1 dave dave 64 Dec 3 21:20 9 -> pipe:[1401597] > > It's stuck reading 0: It's stuck reading standard input, which happens to be attached to another pipe. > root@hiauly6:/proc/14971# strace -p14971 > Process 14971 attached - interrupt to quit > read(0, > > The only process using inode 1401596 is 14971. As seen above, it > seems to be talking to itself. That probably would explain the hang. Odd, is this normal for bash e.g. stdin -> pipe <- other fd. > It's backtrace is: > > 0x4058607c in read () from /lib/libc.so.6 > (gdb) bt > #0 0x4058607c in read () from /lib/libc.so.6 > #1 0x0009051c in zread () > #2 0x000618ac in buffered_getchar () > #3 0x0002c71c in ?? () > #4 0x0002ef74 in ?? () > #5 0x00032ebc in yyparse () > #6 0x00029e30 in parse_command () > #7 0x00029f30 in read_command () > #8 0x0002a0d0 in reader_loop () > #9 0x000292b8 in main () I don't know what to say at this point, it might be a bug in bash, or a bug in pipefs for hppa where the same inode is given out incorrectly under certain circumstances. What does the normal behaviour look like, what is fd 6 being used for? You should be able to use strace to observe the correct operation. Cheers, Carlos. -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
