When testing something else on 2.6.38-rc8 last night, I hit this x86_64 stack overflow. I've never had one before, it seems worth reporting. kdb was in, I jotted it down by hand (the notifier part of it will be notifying kdb of the fault). CONFIG_DEBUG_STACK_OVERFLOW and DEBUG_STACK_USAGE were not set. I should disclose that I have a hack in which may make my stack frames slightly larger than they should be: check against yours. So it may not be an overflow for anyone else, but still a trace to worry about. The faulting address has a stray 2 in it: presumably from when the stack descended into the thread_info and got corrupted. BUG: unable to handle kernel paging request at ffff88027a704060 IP: vprintk+0x100 Thread overran stack, or stack corrupted ffff88007a7040a8 notifier_call_chain+0x40 ffff88007a704108 __atomic_notifier_call_chain+0x48 ffff88007a704148 __die+0x48 ffff88007a7041a8 die+0x50 ffff88007a7041e8 do_general_protection+0x168 ffff88007a704248 general_protection+0x1f ffff88007a704338 schedule+0x25a ffff88007a7044a8 io_schedule+0x35 ffff88007a7044c8 get_request_wait+0xc6 ffff88007a704568 __make_request+0x36d ffff88007a7045d8 generic_make_request+0x2f2 ffff88007a7046a8 submit_bio+0xe1 ffff88007a704738 swap_writepage+0xa3 ffff88007a704788 pageout+0x151 ffff88007a704808 shrink_page_list+0x2db ffff88007a7048b8 shrink_inactive_list+0x2d3 ffff88007a7049b8 shrink_zone+0x17d ffff88007a704a98 shrink_zones+0x0xa3 ffff88007a704b18 do_try_to_free_pages+0x87 ffff88007a704ba8 try_to_free_mem_cgroup_pages+0x8e ffff88007a704c18 mem_cgroup_hierarchical_reclaim+0x220 ffff88007a704cc8 mem_cgroup_do_charge+0xdc ffff88007a704d48 __mem_cgroup_try_charge+0x19c ffff88007a704dc8 mem_cgroup_charge_common+0xa8 ffff88007a704e48 mem_cgroup_cache_charge+0x19a ffff88007a704ec8 add_to_page_cache_locked+0x57 ffff88007a704f28 add_to_page_cache_lru+0x3e ffff88007a704f78 find_or_create_page+0x69 ffff88007a704fe8 grow_dev_page+0x4a ffff88007a705048 grow_buffers+0x41 ffff88007a705088 __getblk_slow+0xd7 ffff88007a7050d8 __getblk+0x44 ffff88007a705128 __ext4_get_inode_loc+0x12c ffff88007a7051d8 ext4_get_inode_loc+0x30 ffff88007a705208 ext4_reserve_inode_write+0x21 ffff88007a705258 ext4_mark_inode_dirty+0x3b ffff88007a7052f8 ext4_dirty_inode+0x3e ffff88007a705338 __mark_inode_dirty+0x32 linux/fs.h mark_inode_dirty linux/quotaops.h dquot_alloc_space linux/quotaops.h dquot_alloc_block ffff88007a705388 ext4_mb_new_blocks+0xc2 ffff88007a705418 ext4_alloc_blocks+0x189 ffff88007a7054e8 ext4_alloc_branch+0x73 ffff88007a7055b8 ext4_ind_map_blocks+0x148 ffff88007a7056c8 ext4_map_blocks+0x148 ffff88007a705738 ext4_getblk+0x5f ffff88007a7057c8 ext4_bread+0x36 ffff88007a705828 ext4_append+0x52 ffff88007a705888 do_split+0x5b ffff88007a705968 ext4_dx_add_entry+0x4b4 ffff88007a705a98 ext4_add_entry+0x7c ffff88007a705b48 ext4_add_nondir+0x2e ffff88007a705b98 ext4_create+0xf5 ffff88007a705c28 vfs_create+0x83 ffff88007a705c88 __open_namei_create+0x59 ffff88007a705ce8 do_last+0x13b ffff88007a705d58 do_filp_open+0x2ae ffff88007a705ed8 do_sys_open+0x72 ffff88007a705f58 sys_open+0x27 Hugh -- 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 internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>