On Tue, 2003-04-15 at 14:34, Bill Nottingham wrote: > > Bug #3 kernel? > > ============== > > This is an unrelated bug and perhaps not the fault of dovecot. When I > > attempted to use strace to get some debugging info on the [imap] > > process, this happened: > > > > [root@xxxxxx /]# strace -p 20486 > > trace: ptrace(PTRACE_SYSCALL, ...): Operation not permitted > > detach: ptrace(PTRACE_DETACH, ...): Operation not permitted > > [root@xxxxxx /]# > > This is a result of the ptrace patch. > > Bill https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=86382 Somebody had already reported this kernel bug. While it isn't a DoS threat since you need to be root to cause the process failure, this makes it impossible to debug these types of processes. Also it isn't immediately apparent that the process can be revived with SIGCONT, so most people think they have an unkillable process after kill -9 fails. -- Warren Togami Fedora Linux Project warren@xxxxxxxxxx http://www.fedora.us GPG 0x54A2ACF1 3rd party packaging community for Red Hat Linux 785A 304B 08C1 F291 F54F 9A68 6BDD FE8E 54A2 ACF1
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