2.4.21-rmap15j: sometimes processes stuck in state D, WCHAN 'down'

We've been seeing processes which occasionally get stuck in state D, WCHAN 'down'. If I go look in /proc/pid/fd, or proc/pid/cwd/, usually I can find one of the open files or directory which will I can hang a new process by attempting to access. The affected files/directories have been on a local ext3 filesystem. The stuck processes are unkillable, even with signal 9.

If I attempt to attach to one of the hung processes with strace, there is no output from strace, and the strace process becomes hung and unkillable as well.

Is anyone else seeing this problem with stock 2.4.21 or 2.4.21-rmap15j?

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Brian Ristuccia
[email protected]

I haven't heard of anything like this. Could you please get a backtrace of all the stuck processes with alt+sysrq+t and decode the backtraces with ksymoops ?

thanks,

Rik

Great minds drink alike.

This is actually the backtrace from ctrl-scrollock or whatever - the machine where it happened didn't have magic sysrq. If the difference is important, I can put a magic sysrq kernel everywhere and try to reproduce it again.

Jul 10 10:18:19 grunt1 kernel: ld            D D6E5C848     0 25131      1
25142 25147 (NOTLB)
Jul 10 10:18:19 grunt1 kernel: Call Trace:    [dput+25/340] [__down+108/200]
[__down_failed+8/12] [.text.lock.namei+53/1246] [link_path_walk+1786/2460]
Jul 10 10:18:19 grunt1 kernel: ld            D D6E5C848     0 25142      1
25131 (NOTLB)
Jul 10 10:18:19 grunt1 kernel: Call Trace:    [dput+25/340] [__down+108/200]
[__down_failed+8/12] [.text.lock.namei+53/1246] [link_path_walk+1786/2460]
Jul 10 10:18:19 grunt1 kernel: ld            D D6E5C848     0 25143      1
25144  7575 (NOTLB)
Jul 10 10:18:19 grunt1 kernel: Call Trace:    [dput+25/340] [__down+108/200]
[__down_failed+8/12] [.text.lock.namei+53/1246] [link_path_walk+1786/2460]
Jul 10 10:18:19 grunt1 kernel: ld            D D6E5C848     0 25144      1
25147 25143 (NOTLB)
Jul 10 10:18:19 grunt1 kernel: Call Trace:    [dput+25/340] [__down+108/200]
[__down_failed+8/12] [.text.lock.namei+53/1246] [link_path_walk+1786/2460]
Jul 10 10:18:19 grunt1 kernel: ld            D D7A6A000   408 25147      1

25131 25144 (NOTLB)

Brian Ristuccia
[email protected]