We are testing newer 2.6.26 xen builds and we found one major problem. We have a heavy cpu and disk bound batch application running on our Dom0 and it consistenly fails within 16~17 hours of execution with the error below (intercepted via netconsole); 2.6.18 xen etch kernel works fine Oct 23 23:47:46 prometeo [59299.638886] Eeek! page_mapcount(page) went negative! (-1) Oct 23 23:47:46 prometeo [59299.638932] page pfn = 4 Oct 23 23:47:46 prometeo [59299.638949] page->flags = 0 Oct 23 23:47:46 prometeo [59299.638970] page->count = 1 Oct 23 23:47:46 prometeo [59299.638987] page->mapping = 0000000000000000 Oct 23 23:47:46 prometeo [59299.639017] vma->vm_ops = 0x0 Oct 23 23:47:46 prometeo [59299.639047] ------------[ cut here ]------------ Oct 23 23:47:46 prometeo [59299.639067] kernel BUG at mm/rmap.c:673! Oct 23 23:47:46 prometeo [59299.639085] invalid opcode: 0000 [1] Oct 23 23:47:46 prometeo SMP Oct 23 23:47:46 prometeo Oct 23 23:47:46 prometeo [59299.639109] CPU 0 Oct 23 23:47:46 prometeo Oct 23 23:47:46 prometeo [59299.639127] Modules linked in: Oct 23 23:47:46 bridge Oct 23 23:47:46 netloop Oct 23 23:47:46 video Oct 23 23:47:46 output Oct 23 23:47:46 ac Oct 23 23:47:46 battery Oct 23 23:47:46 ipv6 Oct 23 23:47:46 nfsd Oct 23 23:47:46 auth_rpcgss Oct 23 23:47:46 exportfs Oct 23 23:47:46 nfs Oct 23 23:47:46 lockd Oct 23 23:47:46 nfs_acl Oct 23 23:47:46 sunrpc Oct 23 23:47:46 xfs Oct 23 23:47:46 netconsole Oct 23 23:47:46 configfs Oct 23 23:47:46 it87 Oct 23 23:47:46 hwmon_vid Oct 23 23:47:46 sbp2 Oct 23 23:47:46 loop Oct 23 23:47:46 pcspkr Oct 23 23:47:46 k8temp Oct 23 23:47:46 pl2303 Oct 23 23:47:46 usbserial Oct 23 23:47:46 i2c_nforce2 Oct 23 23:47:46 i2c_core Oct 23 23:47:46 button Oct 23 23:47:46 evdev Oct 23 23:47:46 ext3 Oct 23 23:47:46 jbd Oct 23 23:47:46 mbcache Oct 23 23:47:46 dm_mirror Oct 23 23:47:46 dm_log Oct 23 23:47:46 dm_snapshot Oct 23 23:47:46 dm_mod Oct 23 23:47:46 raid0 Oct 23 23:47:46 md_mod Oct 23 23:47:46 sd_mod Oct 23 23:47:46 ide_pci_generic Oct 23 23:47:46 amd74xx Oct 23 23:47:46 ide_core Oct 23 23:47:46 forcedeth Oct 23 23:47:46 ohci1394 Oct 23 23:47:46 ieee1394 Oct 23 23:47:46 sata_nv Oct 23 23:47:46 ata_generic Oct 23 23:47:46 libata Oct 23 23:47:46 scsi_mod Oct 23 23:47:46 dock Oct 23 23:47:46 ehci_hcd Oct 23 23:47:46 ohci_hcd Oct 23 23:48:52 prometeo [59365.039659] Pid: 5771, comm: python2.5 Tainted: G D 2.6.26-1-xen-amd64 #1 Oct 23 23:48:52 prometeo [59365.039659] R13: ffff880003abd818 R14: 0000000000000001 R15: 0000000072781000 Oct 23 23:48:52 prometeo [59365.039659] [<ffffffff80435d4e>] ? _spin_lock+0x3a/0x42 Oct 23 23:48:52 prometeo [59365.039659] [<ffffffff8022a73d>] ? mmput+0x2c/0xc0 Oct 23 23:48:52 prometeo [59365.039659] [<ffffffff8027c550>] ? page_remove_rmap+0xfb/0x117 Oct 23 23:48:52 prometeo [59365.039659] Any suggestions? Thanks -- Nephila sas PGP key block: http://www.nephila.it/pgp -- Saluti Nephila sas PGP key block: http://www.nephila.it/pgp