Hi > From: Andrea Arcangeli <aarcange@xxxxxxxxxx> > > Page migration requires rmap to be able to find all migration ptes > created by migration. If the second rmap_walk clearing migration PTEs > misses an entry, it is left dangling causing a BUG_ON to trigger during > fault. For example; > > [ 511.201534] kernel BUG at include/linux/swapops.h:105! > [ 511.201534] invalid opcode: 0000 [#1] PREEMPT SMP > [ 511.201534] last sysfs file: /sys/block/sde/size > [ 511.201534] CPU 0 > [ 511.201534] Modules linked in: kvm_amd kvm dm_crypt loop i2c_piix4 serio_raw tpm_tis shpchp evdev tpm i2c_core pci_hotplug tpm_bios wmi processor button ext3 jbd mbcache dm_mirror dm_region_hash dm_log dm_snapshot dm_mod raid10 raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx raid1 raid0 multipath linear md_mod sg sr_mod cdrom sd_mod ata_generic ahci libahci libata ide_pci_generic ehci_hcd ide_core r8169 mii ohci_hcd scsi_mod floppy thermal fan thermal_sys > [ 511.888526] > [ 511.888526] Pid: 20431, comm: date Not tainted 2.6.34-rc4-mm1-fix-swapops #6 GA-MA790GP-UD4H/GA-MA790GP-UD4H > [ 511.888526] RIP: 0010:[<ffffffff811094ff>] [<ffffffff811094ff>] migration_entry_wait+0xc1/0x129 Do you mean current linus-tree code is broken? do we need to merge this ASAP and need to backport stable tree? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>