On Wed, May 30, 2012 at 12:33:17PM -0400, Dave Jones wrote: > Just saw this on Linus tree as of 731a7378b81c2f5fa88ca1ae20b83d548d5613dc > > WARNING: at mm/page-writeback.c:1990 __set_page_dirty_nobuffers+0x13a/0x170() > Modules linked in: ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_CHECKSUM iptable_mangle bridge stp llc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables snd_emu10k1 snd_util_mem snd_ac97_codec ac97_bus snd_hwdep snd_rawmidi snd_seq_device snd_pcm microcode snd_page_alloc pcspkr snd_timer snd lpc_ich i2c_i801 mfd_core e1000e soundcore vhost_net tun macvtap macvlan kvm_intel nfsd kvm nfs_acl auth_rpcgss lockd sunrpc btrfs libcrc32c zlib_deflate firewire_ohci firewire_core sata_sil crc_itu_t floppy radeon i2c_algo_bit drm_kms_helper ttm drm i2c_core [last unloaded: scsi_wait_scan] > Pid: 35, comm: khugepaged Not tainted 3.4.0+ #75 > Call Trace: > [<ffffffff8104897f>] warn_slowpath_common+0x7f/0xc0 > [<ffffffff810489da>] warn_slowpath_null+0x1a/0x20 > [<ffffffff81146bda>] __set_page_dirty_nobuffers+0x13a/0x170 > [<ffffffff81193322>] migrate_page_copy+0x1e2/0x260 > [<ffffffff811933fb>] migrate_page+0x5b/0x70 > [<ffffffff811934b5>] move_to_new_page+0xa5/0x260 > [<ffffffff81193ca8>] migrate_pages+0x4c8/0x540 > [<ffffffff811610d0>] ? suitable_migration_target.isra.15+0x1d0/0x1d0 > [<ffffffff81162056>] compact_zone+0x216/0x480 > [<ffffffff81321ad8>] ? debug_check_no_obj_freed+0x88/0x210 > [<ffffffff8116259d>] compact_zone_order+0x8d/0xd0 > [<ffffffff811626a9>] try_to_compact_pages+0xc9/0x140 > [<ffffffff81649f4e>] __alloc_pages_direct_compact+0xaa/0x1d0 > [<ffffffff8114562b>] __alloc_pages_nodemask+0x60b/0xab0 > [<ffffffff81321bbc>] ? debug_check_no_obj_freed+0x16c/0x210 > [<ffffffff81185236>] alloc_pages_vma+0xb6/0x190 > [<ffffffff81195d8d>] khugepaged+0x95d/0x1570 > [<ffffffff81073350>] ? wake_up_bit+0x40/0x40 > [<ffffffff81195430>] ? collect_mm_slot+0xa0/0xa0 > [<ffffffff81072c37>] kthread+0xb7/0xc0 > [<ffffffff8165dc14>] kernel_thread_helper+0x4/0x10 > [<ffffffff8165511d>] ? retint_restore_args+0xe/0xe > [<ffffffff81072b80>] ? flush_kthread_worker+0x190/0x190 > [<ffffffff8165dc10>] ? gs_change+0xb/0xb Seems this can be triggered from mmap, as well as from khugepaged.. WARNING: at mm/page-writeback.c:1990 __set_page_dirty_nobuffers+0x13a/0x170() Modules linked in: tun dccp_ipv4 dccp nfnetlink sctp libcrc32c fuse ipt_ULOG binfmt_misc caif_socket caif phonet bluetooth rfkill can llc2 pppoe pppox ppp_generic slhc irda crc_ccitt rds af_key decnet rose x25 atm netrom appletalk ipx p8023 psnap p8022 llc ax25 ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables kvm_intel kvm crc32c_intel ghash_clmulni_intel serio_raw microcode pcspkr i2c_i801 usb_debug lpc_ich mfd_core e1000e nfsd nfs_acl auth_rpcgss lockd sunrpc i915 video i2c_algo_bit drm_kms_helper drm i2c_core [last unloaded: scsi_wait_scan] Pid: 1171, comm: trinity-child4 Not tainted 3.4.0+ #38 Call Trace: [<ffffffff810490ef>] warn_slowpath_common+0x7f/0xc0 [<ffffffff8104914a>] warn_slowpath_null+0x1a/0x20 [<ffffffff8114b4ea>] __set_page_dirty_nobuffers+0x13a/0x170 [<ffffffff81197db2>] migrate_page_copy+0x1e2/0x260 [<ffffffff81197e8b>] migrate_page+0x5b/0x70 [<ffffffff81197f45>] move_to_new_page+0xa5/0x260 [<ffffffff81198738>] migrate_pages+0x4c8/0x540 [<ffffffff811659e0>] ? suitable_migration_target.isra.15+0x1d0/0x1d0 [<ffffffff81166966>] compact_zone+0x216/0x480 [<ffffffff810b1318>] ? trace_hardirqs_off_caller+0x28/0xc0 [<ffffffff81166ead>] compact_zone_order+0x8d/0xd0 [<ffffffff81149525>] ? get_page_from_freelist+0x565/0x970 [<ffffffff81166fb9>] try_to_compact_pages+0xc9/0x140 [<ffffffff81652591>] __alloc_pages_direct_compact+0xaa/0x1d0 [<ffffffff81149f3b>] __alloc_pages_nodemask+0x60b/0xab0 [<ffffffff810b1318>] ? trace_hardirqs_off_caller+0x28/0xc0 [<ffffffff810b4c00>] ? __lock_acquire+0x2b0/0x1aa0 [<ffffffff81189cc6>] alloc_pages_vma+0xb6/0x190 [<ffffffff8119cdb3>] do_huge_pmd_anonymous_page+0x133/0x310 [<ffffffff8116c0c2>] handle_mm_fault+0x242/0x2e0 [<ffffffff8116c372>] __get_user_pages+0x142/0x560 [<ffffffff81171a38>] ? mmap_region+0x3f8/0x630 [<ffffffff8116c842>] get_user_pages+0x52/0x60 [<ffffffff8116d732>] make_pages_present+0x92/0xc0 [<ffffffff811719e6>] mmap_region+0x3a6/0x630 [<ffffffff81050b7c>] ? do_setitimer+0x1cc/0x310 [<ffffffff81171fcd>] do_mmap_pgoff+0x35d/0x3b0 [<ffffffff81172086>] ? sys_mmap_pgoff+0x66/0x240 [<ffffffff811720a4>] sys_mmap_pgoff+0x84/0x240 [<ffffffff813225be>] ? trace_hardirqs_on_thunk+0x3a/0x3f [<ffffffff81006ca2>] sys_mmap+0x22/0x30 [<ffffffff81664ed2>] system_call_fastpath+0x16/0x1b ---[ end trace 336c91f371296e41 ]--- I'd bisect this, but it takes a few hours to trigger, which makes it hard to distinguish between 'good kernel' and 'hasn't triggered yet'. Dave -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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>