Date: Wed, 23 Oct 2002 00:33:25 +0200 From: Daniel Rock <D.Rock@t-online.de> To: current@freebsd.org Subject: file system deadlock in -CURRENT Message-ID: <3DB5D235.6090403@t-online.de>
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Hi, I found an interesting problem during tracing my perl-5.8 problem I mailed some days ago. Sometimes - I cannot forcibly reproduce this event - while I'm trying to truss a process, I first get the following error message: /usr/ports/lang/perl5.8/work/perl-5.8.0# truss ./perl truss: cannot open /proc/44502/mem: No such file or directory or the following error message: /usr/ports/lang/perl5.8/work/perl-5.8.0# truss ./perl truss: PIOCWAIT: Input/output error And then I cannot enter this directory any more. Every process trying to access /usr/ports/lang/perl5.8/work/5.8.0 hangs in an uninterruptible sleep: /# cd /usr/ports/lang/perl5.8 /usr/ports/lang/perl5.8# ls CVS/ distinfo pkg-comment pkg-install* pkg-plist work/ Makefile files/ pkg-descr pkg-message test.log /usr/ports/lang/perl5.8# cd work /usr/ports/lang/perl5.8/work# ls BSDPAN-5.8.0/ perl-5.8.0/ use.perl /usr/ports/lang/perl5.8/work# cd perl-5.8.0 /usr/ports/lang/perl5.8/work/perl-5.8.0# ls [at this point the shell (or any other process) hangs. I can otherwise use the machine as usual but cannot access this directory] Only solution to revive the directory again is a reboot. I have recompiled the kernel with options WITNESS options MUTEX_DEBUG One lock order reversal was logged by the kernel 3 hours earlier: lock order reversal 1st 0xc05a1fe0 spechash (spechash) @ ../../../kern/vfs_subr.c:2748 2nd 0xc17866f0 vnode interlock (vnode interlock) @ ../../../kern/vfs_subr.c:2751 (possibly unrelated) The last time I had this problem I also had a kernel panic (but no crash dump or console output during the crash - possibly also unrelated. I still have reliability problems during heave file system activity). I'm trying to reproduce this error again, then hopefully with a crash dump. Daniel To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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