Description of problem: Using strace on a running smbd process will cause the kernel to hang. (No response to ping, no response to keyboard, no response to Ctrl-Alt-Del.) Version-Release number of selected component (if applicable): kernel-smp-2.2.19-6.2.12.i686 strace-4.2-1.386. How reproducible: Always (But I only tried twice.) Steps to Reproduce: 1. Run smbd 2. Pick a pid of of a child process to trace (ie. one running as a user, not as root) 3. As root, strace -f <pid>, or strace -f <pid> -o <file> Actual Results: The first time, this gave "eh? notify_parent with state 0?" (see kernel/signal.c:613 notify_parent in kernel 2.2.19-6.2.12), followed by a hang. This log event did not make it to disk. The second time, the kernel just hanged. Additional info: 1) The machine on which this is running is a twin processor Pentium III (Coppermine) 600MHz running the SMP kernel and the following modules: nfsd, lockd, sunrpc, autofs, 3c59x, eepro100, st, raid5, raid1, aic7xxx. 2) At the time of the crashes, the machine was lightly loaded. 3) I have not tested with strace as a normal user, only as root, therefore I don't know if this is a potential DoS. (At 30-40 minutes per reboot, I'm not keen on performing very many experiments!)
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