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Subject2.6.32-rc6 BUG at mm/slab.c:2869!
Sorry I don't have a lot to go on here, but thought I'd report it anyway.
I was just starting firefox and got the following two stack traces in
succession. The kernel is based on 894ef820b10d77e2d6d717342fc408bdd9825139.

Some kind of memory/filesystem corruption?

[ 8904.113230] ------------[ cut here ]------------
[ 8902.989751] kernel BUG at mm/slab.c:2869!
[ 8902.989755] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 8902.989762] last sysfs file: /sys/class/rfkill/rfkill0/state
[ 8902.989765] Modules linked in: fuse af_packet ipt_REJECT xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_state iptable_filter ip_tables x_tables acpi_cpufreq binfmt_misc dm_mirror dm_region_hash dm_log dm_multipath dm_mod kvm_intel kvm uinput arc4 ecb ath5k mac80211 i915 appletouch hid_apple usbhid snd_hda_codec_idt ath drm ohci1394 snd_hda_intel cfg80211 snd_hda_codec i2c_algo_bit ieee1394 snd_pcm video processor rfkill ehci_hcd sky2 snd_timer snd snd_page_alloc backlight uhci_hcd joydev sg ac battery thermal button output applesmc sr_mod cdrom input_polldev evdev unix [last unloaded: scsi_wait_scan]
[ 8902.989844]
[ 8902.989849] Pid: 253, comm: kswapd0 Not tainted (2.6.31-rc6 #179) MacBook1,1
[ 8902.989852] EIP: 0060:[<c10995cc>] EFLAGS: 00010002 CPU: 0
[ 8902.989860] EIP is at cache_free_debugcheck+0x1a9/0x28a
[ 8902.989863] EAX: 009d4e2e EBX: 8ee08ec0 ECX: 31286ea0 EDX: 009d4e2e
[ 8902.989867] ESI: d84156c5 EDI: f7034440 EBP: f590fcb0 ESP: f590fc80
[ 8902.989870] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[ 8902.989874] Process kswapd0 (pid: 253, ti=f590e000 task=f72b0418 task.ti=f590e000)
[ 8902.989877] Stack:
[ 8902.989879] f590fc88 c104aac4 00002184 c008f000 c10b8f69 f4205880 009d4e2e c008fd60
[ 8902.989890] <0> c008fd68 f706af30 f7034440 e77e4ea0 f590fccc c1099911 c008fd68 00000296
[ 8902.989901] <0> c008fd68 00000001 e77e4ea0 f590fcd8 c10b8f69 c008fd68 f590fcf4 c10b92f3
[ 8902.989914] Call Trace:
[ 8902.989920] [<c104aac4>] ? trace_hardirqs_off+0xb/0xd
[ 8902.989926] [<c10b8f69>] ? free_buffer_head+0x21/0x62
[ 8902.989931] [<c1099911>] ? kmem_cache_free+0x4c/0xdf
[ 8902.989936] [<c10b8f69>] ? free_buffer_head+0x21/0x62
[ 8902.989941] [<c10b92f3>] ? try_to_free_buffers+0x7f/0x8f
[ 8902.989947] [<c1122f6c>] ? jbd2_journal_try_to_free_buffers+0x137/0x13f
[ 8902.989953] [<c10fbce2>] ? ext4_releasepage+0x54/0x62
[ 8902.989959] [<c10784a2>] ? try_to_release_page+0x35/0x44
[ 8902.989965] [<c10827e1>] ? shrink_page_list+0x4b5/0x657
[ 8902.989971] [<c1049d9d>] ? put_lock_stats+0xd/0x21
[ 8902.989976] [<c104b8eb>] ? trace_hardirqs_on+0xb/0xd
[ 8902.989982] [<c1297839>] ? _spin_unlock_irq+0x32/0x47
[ 8902.989987] [<c1082bd0>] ? shrink_list+0x24d/0x514
[ 8902.989993] [<c1007cb3>] ? sched_clock+0x48/0x8d
[ 8902.990000] [<c1007cb3>] ? sched_clock+0x48/0x8d
[ 8902.990004] [<c1049d69>] ? get_lock_stats+0x11/0x38
[ 8902.990009] [<c1049d9d>] ? put_lock_stats+0xd/0x21
[ 8902.990014] [<c10830a8>] ? shrink_zone+0x211/0x2aa
[ 8902.990020] [<c1083682>] ? kswapd+0x3e2/0x587
[ 8902.990021] [<c1081686>] ? isolate_pages_global+0x0/0x18b
[ 8902.990021] [<c103ca60>] ? autoremove_wake_function+0x0/0x34
[ 8902.990021] [<c10832a0>] ? kswapd+0x0/0x587
[ 8902.990021] [<c103c78b>] ? kthread+0x70/0x75
[ 8902.990021] [<c103c71b>] ? kthread+0x0/0x75
[ 8902.990021] [<c10034f7>] ? kernel_thread_helper+0x7/0x10
[ 8902.990021] Code: 0d 8b 47 2c 8b 55 e0 8b 4d ec 89 54 01 fc 8b 4d dc 8b 59 0c 8b 4d ec 29 d9 89 c8 f7 67 30 3b 57 38 89 45 e4 89 d0 89 55 e8 72 04 <0f> 0b eb fe 8b 4f 2c 0f af ca 8d 14 0b 39 55 ec 74 04 0f 0b eb
[ 8902.990021] EIP: [<c10995cc>] cache_free_debugcheck+0x1a9/0x28a SS:ESP 0068:f590fc80
[ 8902.990021] ---[ end trace 73f44c391fc78b0a ]---
[ 8904.113230] ------------[ cut here ]------------
[ 8904.113250] WARNING: at lib/list_debug.c:51 list_del+0x41/0x60()
[ 8904.113256] Hardware name: MacBook1,1
[ 8904.113262] list_del corruption. next->prev should be c03c0000, but was 8ed88ec8
[ 8904.113267] Modules linked in: fuse af_packet ipt_REJECT xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_state iptable_filter ip_tables x_tables acpi_cpufreq binfmt_misc dm_mirror dm_region_hash dm_log dm_multipath dm_mod kvm_intel kvm uinput arc4 ecb ath5k mac80211 i915 appletouch hid_apple usbhid snd_hda_codec_idt ath drm ohci1394 snd_hda_intel cfg80211 snd_hda_codec i2c_algo_bit ieee1394 snd_pcm video processor rfkill ehci_hcd sky2 snd_timer snd snd_page_alloc backlight uhci_hcd joydev sg ac battery thermal button output applesmc sr_mod cdrom input_polldev evdev unix [last unloaded: scsi_wait_scan]
[ 8904.113422] Pid: 6452, comm: firefox Tainted: G D 2.6.31-rc6 #179
[ 8904.113425] Call Trace:
[ 8904.113433] [<c1029a35>] warn_slowpath_common+0x6a/0x81
[ 8904.113438] [<c1156ff1>] ? list_del+0x41/0x60
[ 8904.113443] [<c1029a8a>] warn_slowpath_fmt+0x29/0x2c
[ 8904.113447] [<c1156ff1>] list_del+0x41/0x60
[ 8904.113453] [<c1099b3f>] free_block+0x7d/0x15a
[ 8904.113457] [<c10996f2>] ? cache_flusharray+0x45/0xf2
[ 8904.113462] [<c1099743>] cache_flusharray+0x96/0xf2
[ 8904.113467] [<c1099933>] kmem_cache_free+0x6e/0xdf
[ 8904.113473] [<c10b8f69>] free_buffer_head+0x21/0x62
[ 8904.113477] [<c10b92f3>] try_to_free_buffers+0x7f/0x8f
[ 8904.113483] [<c1122f6c>] jbd2_journal_try_to_free_buffers+0x137/0x13f
[ 8904.113490] [<c1106acf>] bdev_try_to_free_page+0x4c/0x5a
[ 8904.113495] [<c1106a83>] ? bdev_try_to_free_page+0x0/0x5a
[ 8904.113500] [<c10bebd7>] blkdev_releasepage+0x2b/0x36
[ 8904.113506] [<c10784a2>] try_to_release_page+0x35/0x44
[ 8904.113512] [<c10827e1>] shrink_page_list+0x4b5/0x657
[ 8904.113518] [<c104b8eb>] ? trace_hardirqs_on+0xb/0xd
[ 8904.113524] [<c1297839>] ? _spin_unlock_irq+0x32/0x47
[ 8904.113529] [<c1082bd0>] shrink_list+0x24d/0x514
[ 8904.113535] [<c103275f>] ? lock_timer_base+0x26/0x45
[ 8904.113540] [<c107f258>] ? get_dirty_limits+0x21/0x28a
[ 8904.113562] [<faaa16af>] ? mmu_shrink+0x1c/0xf4 [kvm]
[ 8904.113566] [<c104d6fa>] ? print_lock_contention_bug+0x11/0xb2
[ 8904.113573] [<c10830a8>] shrink_zone+0x211/0x2aa
[ 8904.113578] [<c1083cd3>] try_to_free_pages+0x1d1/0x2b2
[ 8904.113583] [<c1081686>] ? isolate_pages_global+0x0/0x18b
[ 8904.113589] [<c107e254>] __alloc_pages_nodemask+0x2d5/0x457
[ 8904.113594] [<c108001d>] __do_page_cache_readahead+0x10c/0x1c7
[ 8904.113599] [<c10800f4>] ra_submit+0x1c/0x21
[ 8904.113604] [<c1079897>] filemap_fault+0x1c5/0x39e
[ 8904.113609] [<c108a99e>] __do_fault+0x40/0x363
[ 8904.113614] [<c1299c10>] ? do_page_fault+0x1da/0x313
[ 8904.113620] [<c108c3a2>] handle_mm_fault+0x228/0x4ea
[ 8904.113625] [<c1299c10>] ? do_page_fault+0x1da/0x313
[ 8904.113630] [<c1299d3a>] do_page_fault+0x304/0x313
[ 8904.113635] [<c1299a36>] ? do_page_fault+0x0/0x313
[ 8904.113639] [<c1298133>] error_code+0x6b/0x70
[ 8904.113644] [<c1299a36>] ? do_page_fault+0x0/0x313
[ 8904.113648] ---[ end trace 73f44c391fc78b0b ]---


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