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Subjectpossible deadlock in 2.4.4 sys_getdents ?
Hello all,

after weeks of uptime, 2.4.4 kernel freezed several of
my processes. It seems like deadlock.
I typed "whereis perl" and system got frozen. After quick
look I found that I typed the command while "makedb" script
was running. All processes are on down:
budha:~# ps -A -o pid,cmd,eip,wchan|grep down
1131 find / /dev/pts 400cd923 down
5740 ls --color /usr/ 400bb923 down
5738 whereis perl 400bb79e down

budha:~# ls /proc/1131/fd -l
total 0
lr-x------ 1 root root 64 Jun 19 14:37 0 -> /dev/null
l-wx------ 1 root root 64 Jun 19 14:37 1 -> pipe:[2577]
l-wx------ 1 root root 64 Jun 19 14:37 2 -> pipe:[2558]
lr-x------ 1 root root 64 Jun 19 14:37 3 -> /
lr-x------ 1 root root 64 Jun 19 14:37 4 -> /usr/share/man/man1

Now see strace output of whereis:
5738 getdents(5, /* 0 entries */, 3933) = 0
5738 close(5) = 0
5738 stat("/usr/share/man/man1", {st_mode=S_IFDIR|0755, st_size=22528,
...}) =
0
5738 open("/usr/share/man/man1", O_RDONLY|O_NONBLOCK|0x10000) = 5
5738 fstat(5, {st_mode=S_IFDIR|0755, st_size=22528, ...}) = 0
5738 fcntl(5, F_SETFD, FD_CLOEXEC) = 0
5738 getdents(5,

It stops at getdents. I don't know how to trace it further down ..
I have to reboot machine and probably will not be able to simulate
it again. Only it is evident that it is possible to hang it up
and kill -9 doesn't work (uninteruptible sleep).

I hope this helps improve stability.
devik

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