Date: Tue, 5 Dec 2000 22:51:00 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Barry Lustig <barry@lustig.com> Cc: stable@freebsd.org, Garance A Drosihn <drosih@rpi.edu> Subject: Re: VMware hanging Message-ID: <200012060651.eB66p0c91421@earth.backplane.com> References: <20001118231633.A85206@evilcode.com> <200011190635.eAJ6ZRS94516@grumpy.dyndns.org> <20001118230305.A83848@evilcode.com> <20001119151138.A7434@bsdvm.jtjang.idv.tw> <200011192202.eAJM2cG03593@billy-club.village.org> <200011192239.eAJMdDa90818@earth.backplane.com> <200011192308.eAJN8q714360@whizzo.transsys.com> <200011192324.eAJNO1891133@earth.backplane.com> <20001205232913.15317.qmail@devious.lustig.com> <200012060019.eB60JgJ88193@earth.backplane.com> <20001206023936.15587.qmail@devious.lustig.com> <200012060324.eB63OvG90385@earth.backplane.com> <20001206051514.15819.qmail@devious.lustig.com>
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Ok, your system appears to be locked up in the buffer cache code.
Something (probably vmware) created over 1800 dirty buffers. The
high water mark is less then 500.
(kgdb) print numdirtybuffers
$8 = 0x71f <--------- oops
(kgdb) print hidirtybuffers
$9 = 0x1e7
I believe what is going on here is that some process is writing
data through the filesystem and bypassing the low-memory bwillwrite()
code.
I'm going to hazzard a guess that it could be writev(), which missed
my bwillwrite() patch. Please try the patch below. If it isn't this
it's got to be something similar, somewhere.
-Matt
Index: kern/sys_generic.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/sys_generic.c,v
retrieving revision 1.55.2.8
diff -u -r1.55.2.8 sys_generic.c
--- kern/sys_generic.c 2000/11/26 02:30:04 1.55.2.8
+++ kern/sys_generic.c 2000/12/06 06:49:33
@@ -494,6 +494,7 @@
}
#endif
cnt = auio.uio_resid;
+ bwillwrite();
if ((error = fo_write(fp, &auio, fp->f_cred, 0, p))) {
if (auio.uio_resid != cnt && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
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