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Date: Thu, 24 Mar 2005 00:26:32 -0500 (EST)
From: Jeff Roberson <jroberson@chesapeake.net>
To: Peter Holm <peter@holm.cc>
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cc: current@freebsd.org
Subject: Re: Process stuck in getblk
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On Sun, 20 Mar 2005, Peter Holm wrote:

> With GENERIC HEAD from Mar 18 15:56 UTC I ran into these two
> problems where a user process seems to be waiting on a lock,
> that appears to be owned by non-existent thread.

Odd that this is a directory.  Do you know if the other times you were
able to trigger this were also with directories?

>
> 5123 [SLPQ getblk 0xc665717c][SLP] mkdir
>
> sleepq_switch(c665717c,cf4698c8,c061bcd5,...) at sleepq_switch+0xe0
> sleepq_wait(c665717c,0,0,2010020,600) at sleepq_wait+0x30
> msleep(c665717c,c09118dc,50,c083af8f,0) at msleep+0x311
> acquire(cf469920,2010020,600,c1b2b000,0) at acquire+0xba
> debuglockmgr(c665717c,2090022,c1e7d5a0,...) at debuglockmgr+0x406
> getblk(c1e7d500,0,0,800,0) at getblk+0x15a
> breadn(c1e7d500,0,0,800,0) at breadn+0x58
> bread(c1e7d500,0,0,800,0) at bread+0x20
> ffs_blkatoff(c1e7d500,0,0,0,cf469a58) at ffs_blkatoff+0x9e
> ufs_lookup(cf469b18) at ufs_lookup+0x326
> VOP_CACHEDLOOKUP_APV(c08cf140,cf469b18) at VOP_CACHEDLOOKUP_APV+0x7e
> vfs_cache_lookup(cf469b9c) at vfs_cache_lookup+0xd2
> VOP_LOOKUP_APV(c08cf140,cf469b9c) at VOP_LOOKUP_APV+0x7e
> lookup(cf469c7c,c0918d80,0,c1b2b000,69f) at lookup+0x362
> namei(cf469c7c) at namei+0x34a
> kern_rmdir(c1b2b000,bfbc97d0,0,cf469d40,c07cc3a3) at kern_rmdir+0x3a
> rmdir(c1b2b000,cf469d14,1,25,292) at rmdir+0x12
> syscall(2804002f,bfbf002f,bfb8002f,2804f24c,bfbfeb00) at syscall+0x213
>
> (kgdb) p (*(struct lock *)0xc665717c)->lk_lockholder->td_state
> $2 = TDS_INACTIVE
>
> http://www.holm.cc/stress/log/cons122.html
> http://www.holm.cc/stress/log/cons123.html
> --
> Peter Holm
>