On Thu 17-02-11 11:11:51, Linus Torvalds wrote: > On Thu, Feb 17, 2011 at 10:57 AM, Eric W. Biederman > <ebiederm@xxxxxxxxxxxx> wrote: > > > > fedora 14 > > ext4 on all filesystems > > Your dmesg snippets had ext3 mentioned, though: > > <6>EXT3-fs (sda1): recovery required on readonly filesystem > <6>EXT3-fs (sda1): write access will be enabled during recovery > <6>EXT3-fs: barriers not enabled > .. > <6>EXT3-fs (sda1): recovery complete > <6>EXT3-fs (sda1): mounted filesystem with ordered data mode > <6>dracut: Mounted root filesystem /dev/sda1 > > not that I see that it should matter, but there's been some bigger > ext3 changes too (like the batched discard). > > I don't really think ext3 is the issue, though. > > > I was about to say this happens with DEBUG_PAGEALLOC enabled but it > > appears that options keeps eluding my fingers when I have a few minutes > > to play with it. ?Perhaps this time will be the charm. > > Please do. You seem to be much better at triggering it than anybody > else. And do the DEBUG_LIST and DEBUG_SLUB_ON things too (even if the > DEBUG_LIST thing won't catch list_move()) I was able to reproduce (now it fired into dcopserver) with the following simple test case: while true do rmmod iwl3945 iwlcore mac80211 cfg80211 sleep 2 modprobe iwl3945 done Now, I will try with the 2 patches patches in this thread. I will also turn on DEBUG_LIST and DEBUG_PAGEALLOC. --- [35951.911197] cfg80211: Calling CRDA to update world regulatory domain [35951.957782] iwl3945: Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux, in-tree:ds [35951.957787] iwl3945: Copyright(c) 2003-2010 Intel Corporation [35951.957866] iwl3945 0000:05:00.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18 [35951.957889] iwl3945 0000:05:00.0: setting latency timer to 64 [35951.999336] iwl3945 0000:05:00.0: Tunable channels: 13 802.11bg, 23 802.11a channels [35951.999342] iwl3945 0000:05:00.0: Detected Intel Wireless WiFi Link 3945ABG [35951.999492] iwl3945 0000:05:00.0: irq 42 for MSI/MSI-X [35951.999737] PM: Adding info for No Bus:phy0 [35951.999791] ieee80211 phy0: Selected rate control algorithm 'iwl-3945-rs' [35951.999902] PM: Adding info for No Bus:wlan0 [35953.641528] BUG: Bad page map in process dcopserver pte:c5b8fe68 pmd:05b8f067 [35953.641539] addr:b739a000 vm_flags:08000075 anon_vma: (null) mapping:c7d25dfc index:119 [35953.641551] vma->vm_ops->fault: filemap_fault+0x0/0x33d [35953.641559] vma->vm_file->f_op->mmap: generic_file_mmap+0x0/0x42 [35953.641567] Pid: 11720, comm: dcopserver Not tainted 2.6.38-rc4-page-alloc-00001-g07409af #97 [35953.641573] Call Trace: [35953.641585] [<c01a6f50>] ? print_bad_pte+0x14b/0x15d [35953.641593] [<c01a97be>] ? unmap_vmas+0x3d4/0x648 [35953.641604] [<c01ab43c>] ? exit_mmap+0xae/0x145 [35953.641613] [<c0133395>] ? mmput+0x3c/0xb0 [35953.641621] [<c0136ba4>] ? exit_mm+0x101/0x109 [35953.641629] [<c0138477>] ? do_exit+0x1ce/0x60f [35953.641638] [<c014f7bd>] ? hrtimer_interrupt+0x130/0x1e2 [35953.641647] [<c013891f>] ? do_group_exit+0x67/0x8a [35953.641654] [<c013895a>] ? sys_exit_group+0x18/0x1c [35953.641662] [<c0102890>] ? sysenter_do_call+0x12/0x26 [35953.641668] Disabling lock debugging due to kernel taint [35953.641674] BUG: Bad page map in process dcopserver pte:c5b8fe68 pmd:05b8f067 [35953.641681] addr:b739b000 vm_flags:08000075 anon_vma: (null) mapping:c7d25dfc index:11a [35953.641688] vma->vm_ops->fault: filemap_fault+0x0/0x33d [35953.641695] vma->vm_file->f_op->mmap: generic_file_mmap+0x0/0x42 [35953.641701] Pid: 11720, comm: dcopserver Tainted: G B 2.6.38-rc4-page-alloc-00001-g07409af #97 [35953.641708] Call Trace: [35953.641715] [<c01a6f50>] ? print_bad_pte+0x14b/0x15d [35953.641723] [<c01a97be>] ? unmap_vmas+0x3d4/0x648 [35953.641734] [<c01ab43c>] ? exit_mmap+0xae/0x145 [35953.641741] [<c0133395>] ? mmput+0x3c/0xb0 [35953.641748] [<c0136ba4>] ? exit_mm+0x101/0x109 [35953.641756] [<c0138477>] ? do_exit+0x1ce/0x60f [35953.641764] [<c014f7bd>] ? hrtimer_interrupt+0x130/0x1e2 [35953.641772] [<c013891f>] ? do_group_exit+0x67/0x8a [35953.641780] [<c013895a>] ? sys_exit_group+0x18/0x1c [35953.641787] [<c0102890>] ? sysenter_do_call+0x12/0x26 [35962.064991] PM: Removing info for No Bus:wlan0 [35962.092070] PM: Removing info for No Bus:phy0 [35962.092327] iwl3945 0000:05:00.0: PCI INT A disabled -- Michal Hocko SUSE Labs SUSE LINUX s.r.o. Lihovarska 1060/12 190 00 Praha 9 Czech Republic -- 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>