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Subject2.6.0-test4: blkdev_requests "memory before object was overwritten" and oops in __iget
Hello!

Found one of my test boxes freezed today (or may be even yesterday).
That's what was in logs:

Aug 25 00:50:37 dwarf kernel: [drm] DMA Cleanup
Aug 25 21:46:31 dwarf kernel: mtrr: base(0xf8000000) is not aligned on a size(0x180000) boundary
Aug 25 21:46:31 dwarf kernel: [drm] Using POST v1.2 init.
Aug 25 21:46:31 dwarf kernel: PCI: Found IRQ 11 for device 0000:00:02.0
Aug 25 21:46:39 dwarf kernel: slab error in cache_alloc_debugcheck_after(): cache `blkdev_requests': memory before object was overwritten
Aug 25 21:46:39 dwarf kernel: Call Trace:
Aug 25 21:46:39 dwarf kernel: [<c0153b4b>] kmem_cache_alloc+0xdb/0x1c0
Aug 25 21:46:39 dwarf kernel: [<c014c615>] mempool_alloc+0x65/0x290
Aug 25 21:46:39 dwarf kernel: [<c014c615>] mempool_alloc+0x65/0x290
Aug 25 21:46:39 dwarf kernel: [<c0123af0>] autoremove_wake_function+0x0/0x50
Aug 25 21:46:39 dwarf last message repeated 2 times
Aug 25 21:46:39 dwarf kernel: [<c039d60f>] get_request+0x19f/0x550
Aug 25 21:46:39 dwarf kernel: [<c039aa79>] elv_merge+0x29/0x30
Aug 25 21:46:39 dwarf kernel: [<c039e51c>] __make_request+0x1ac/0x690
Aug 25 21:46:39 dwarf kernel: [<c039eb43>] generic_make_request+0x143/0x1e0
Aug 25 21:46:39 dwarf kernel: [<c017813a>] bio_alloc+0xda/0x1c0
Aug 25 21:46:40 dwarf kernel: [<c039ec1d>] submit_bio+0x3d/0x80
Aug 25 21:46:40 dwarf kernel: [<c01d7eda>] submit_logged_buffer+0x3a/0x60
Aug 25 21:46:41 dwarf kernel: [<c01d8583>] kupdate_one_transaction+0x233/0x240
Aug 25 21:46:41 dwarf kernel: [<c01d8619>] reiserfs_journal_kupdate+0x89/0xd0
Aug 25 21:46:41 dwarf kernel: [<c01db471>] flush_old_commits+0x141/0x1d0
Aug 25 21:46:41 dwarf kernel: [<c01c90d0>] reiserfs_write_super+0x30/0x40
Aug 25 21:46:41 dwarf kernel: [<c017a3aa>] sync_supers+0x1ea/0x280
Aug 25 21:46:41 dwarf kernel: [<c014fa85>] wb_kupdate+0x45/0x140
Aug 25 21:46:41 dwarf kernel: [<c0120aba>] schedule+0x1fa/0x530
Aug 25 21:46:41 dwarf kernel: [<c0150424>] __pdflush+0x214/0x600
Aug 25 21:46:41 dwarf kernel: [<c0150810>] pdflush+0x0/0x20
Aug 25 21:46:41 dwarf kernel: [<c0150821>] pdflush+0x11/0x20
Aug 25 21:46:41 dwarf kernel: [<c014fa40>] wb_kupdate+0x0/0x140
Aug 25 21:46:41 dwarf kernel: [<c0108269>] kernel_thread_helper+0x5/0xc
Aug 25 21:46:41 dwarf kernel:
Aug 25 21:46:41 dwarf kernel: slab error in cache_alloc_debugcheck_after(): cache `blkdev_requests': memory after object was overwritten
Aug 25 21:46:41 dwarf kernel: Call Trace:
Aug 25 21:46:41 dwarf kernel: [<c0153b73>] kmem_cache_alloc+0x103/0x1c0
Aug 25 21:46:41 dwarf kernel: [<c014c615>] mempool_alloc+0x65/0x290
Aug 25 21:46:41 dwarf kernel: [<c014c615>] mempool_alloc+0x65/0x290
Aug 25 21:46:41 dwarf kernel: [<c0123af0>] autoremove_wake_function+0x0/0x50
Aug 25 21:46:41 dwarf last message repeated 2 times
Aug 25 21:46:41 dwarf kernel: [<c039d60f>] get_request+0x19f/0x550
Aug 25 21:46:41 dwarf kernel: [<c039aa79>] elv_merge+0x29/0x30
Aug 25 21:46:41 dwarf kernel: [<c039e51c>] __make_request+0x1ac/0x690
Aug 25 21:46:41 dwarf kernel: [<c039eb43>] generic_make_request+0x143/0x1e0
Aug 25 21:46:41 dwarf kernel: [<c017813a>] bio_alloc+0xda/0x1c0
Aug 25 21:46:41 dwarf kernel: [<c039ec1d>] submit_bio+0x3d/0x80
Aug 25 21:46:42 dwarf kernel: [<c01d7eda>] submit_logged_buffer+0x3a/0x60
Aug 25 21:46:42 dwarf kernel: [<c01d8583>] kupdate_one_transaction+0x233/0x240
Aug 25 21:46:42 dwarf kernel: [<c01d8619>] reiserfs_journal_kupdate+0x89/0xd0
Aug 25 21:46:42 dwarf kernel: [<c01db471>] flush_old_commits+0x141/0x1d0
Aug 25 21:46:42 dwarf kernel: [<c01c90d0>] reiserfs_write_super+0x30/0x40
Aug 25 21:46:42 dwarf kernel: [<c017a3aa>] sync_supers+0x1ea/0x280
Aug 25 21:46:42 dwarf kernel: [<c014fa85>] wb_kupdate+0x45/0x140
Aug 25 21:46:42 dwarf kernel: [<c0120aba>] schedule+0x1fa/0x530
Aug 25 21:46:42 dwarf kernel: [<c0150424>] __pdflush+0x214/0x600
Aug 25 21:46:42 dwarf kernel: [<c0150810>] pdflush+0x0/0x20
Aug 25 21:46:42 dwarf kernel: [<c0150821>] pdflush+0x11/0x20
Aug 25 21:46:42 dwarf kernel: [<c014fa40>] wb_kupdate+0x0/0x140
Aug 25 21:46:42 dwarf kernel: [<c0108269>] kernel_thread_helper+0x5/0xc
Aug 25 21:46:42 dwarf kernel:
Aug 25 21:46:44 dwarf kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000000
Aug 25 21:46:44 dwarf kernel: printing eip:
Aug 25 21:46:44 dwarf kernel: c0193139
Aug 25 21:46:44 dwarf kernel: *pde = 00000000
Aug 25 21:46:44 dwarf kernel: Oops: 0002 [#1]
Aug 25 21:46:44 dwarf kernel: CPU: 0
Aug 25 21:46:44 dwarf kernel: EIP: 0060:[<c0193139>] Not tainted
Aug 25 21:46:44 dwarf kernel: EFLAGS: 00010246
Aug 25 21:46:44 dwarf kernel: EIP is at __iget+0x29/0x60
Aug 25 21:46:44 dwarf kernel: eax: c04fb328 ebx: cd46c03c ecx: 00000000 edx: cd46c044
Aug 25 21:46:44 dwarf kernel: esi: 00000071 edi: c04fb360 ebp: df8f5e44 esp: df8f5e40
Aug 25 21:46:44 dwarf kernel: ds: 007b es: 007b ss: 0068
Aug 25 21:46:44 dwarf kernel: Process kswapd0 (pid: 8, threadinfo=df8f4000 task=df926000)
Aug 25 21:46:44 dwarf kernel: Stack: cd46c03c df8f5e84 c019398e cd46c03c 00000077 000000ff 000001ef 000000ff
Aug 25 21:46:45 dwarf kernel: df8f5e60 df8f5e60 00000000 00000071 c9984044 d57d5044 00000080 df8f4000
Aug 25 21:46:45 dwarf kernel: 00000053 df8f5e90 c0193be8 00000080 df8f5ec4 c0157cff 00000080 000000d0
Aug 25 21:46:45 dwarf kernel: Call Trace:
Aug 25 21:46:45 dwarf kernel: [<c019398e>] prune_icache+0x20e/0x440
Aug 25 21:46:45 dwarf kernel: [<c0193be8>] shrink_icache_memory+0x28/0x30
Aug 25 21:46:45 dwarf kernel: [<c0157cff>] shrink_slab+0x11f/0x170
Aug 25 21:46:45 dwarf kernel: [<c0159b70>] balance_pgdat+0x1e0/0x220
Aug 25 21:46:45 dwarf kernel: [<c0159c95>] kswapd+0xe5/0x100
Aug 25 21:46:45 dwarf kernel: [<c0123af0>] autoremove_wake_function+0x0/0x50
Aug 25 21:46:45 dwarf kernel: [<c0123af0>] autoremove_wake_function+0x0/0x50
Aug 25 21:46:45 dwarf kernel: [<c0159bb0>] kswapd+0x0/0x100
Aug 25 21:46:45 dwarf kernel: [<c0108269>] kernel_thread_helper+0x5/0xc
Aug 25 21:46:45 dwarf kernel:
Aug 25 21:46:45 dwarf kernel: Code: 89 01 c7 43 08 00 01 10 00 89 48 04 a1 20 b3 4f c0 89 50 04
Aug 25 21:46:45 dwarf kernel: fs/fs-writeback.c:71: spin_lock(fs/inode.c:c04fb330) already locked by fs/inode.c/409
Aug 25 22:54:59 dwarf kernel: [drm] DMA Cleanup

This is usual pentium3-650, 512M RAM, i815-based motherboard, uniprocessor
kernel. X server was not started at the time.
Ask me if you need more info.

Bye,
Oleg
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