Date: Thu, 12 Dec 2002 11:34:00 -0500 (EST) From: John Baldwin <jhb@FreeBSD.org> To: Kris Kennaway <kris@obsecurity.org> Cc: current@FreeBSD.org, alpha@FreeBSD.org Subject: RE: UMA panic under load Message-ID: <XFMail.20021212113400.jhb@FreeBSD.org> In-Reply-To: <20021212093620.GA96248@rot13.obsecurity.org>
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On 12-Dec-2002 Kris Kennaway wrote: > I got this on an alpha tonight. It was under heavy load at the time > (18 simultaneous package builds had just been spawned on the machine). > Any ideas? > > Slab at 0xfffffc00042d3fb8, freei 2 = 0. > panic: Duplicate free of item 0xfffffc00042d22e0 from zone 0xfffffc0007d31800(VMSPACE) > > db_print_backtrace() at db_print_backtrace+0x18 > panic() at panic+0x104 > uma_dbg_free() at uma_dbg_free+0x170 > uma_zfree_arg() at uma_zfree_arg+0x150 > vmspace_free() at vmspace_free+0xe4 > swapout_procs() at swapout_procs+0x428 > vm_daemon() at vm_daemon+0x74 > fork_exit() at fork_exit+0xe0 > exception_return() at exception_return > --- root of call graph --- > panic > Stopped at Debugger+0x34: zapnot v0,#0xf,v0 <v0=0x0> > db> I have seen this on a couple of different arch's I think. A vmspace shouldn't be free'd here, it's refcount should not be that low. I wonder if something is free'ing the vmspace w/o dropping the refcount? -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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