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    SubjectRe: [Fastboot] Re: Kdump Testing
    On Wed, Apr 27, 2005 at 12:23:12PM -0700, Randy.Dunlap wrote:
    > On Tue, 26 Apr 2005 14:24:48 +0530
    > Vivek Goyal <vgoyal@in.ibm.com> wrote:
    >
    > > >
    > > > 2.6.12-rc2-mm3 reboots vmlinux-recover-UP on panic.
    > > > (vmlinux-recover-SMP hangs during [early] reboot, but -UP
    > > > goes further....)
    > > >
    > > > (BTW, how does I do serial console from the second
    > > > kernel...? It has the drivers, but not the command
    > > > line info? TBD.)
    > > >
    > >
    > >
    > > While pre-loading the capture kernel using kexec, you can specify the command
    > > line options to second kernel using --append="". You must already be passing
    > > the root device. Add you serial console parameters as well something like
    > > --append="console=ttyS0, 38400"
    > >
    > >
    > > > vmlinux-recover-UP gets to this point, hand-written,
    > > > several lines missing:
    > > >
    > > > kfree_debugcheck: bad ptr c3dbffb0h. ( == %esi)
    > > > kernel BUG at <bad filename>:23128!
    > > > invalid operand: 0000 [#1]
    > > > DEBUG_PAGEALLOC
    > > > EIP is at kfree_debugcheck+0x45/0x50
    > > >
    > > > Stack dump shows lots of ext3 cache and inode functions...
    > > >
    > >
    > > Can you post a full serial console output of second kernel? That would help.
    >
    > I did another test run, same kernels (both running and recovery).
    > The recovery kernel got a little further this time, still had
    > Badness and a BUG.
    >
    > ---

    Ok. I am also able to see this slab corruption occurring on my machine. I can
    get away with the problem if I disable cachefs support.

    Infact, I can reproduce the problem if I boot capture kernel normally through
    BIOS with commandline "mem=64M". Looks like it is generic problem and not
    associated with kexec/kdump. Cachefs might be doing some corruption.


    > CacheFS: Wrong magic number on cache
    > EXT3-fs: INFO: recovery required on readonly filesystem.
    > EXT3-fs: write access will be enabled during recovery.
    > input: ImPS/2 Generic Wheel Mouse on isa0060/serio1
    > kjournald starting. Commit interval 5 seconds
    > EXT3-fs: recovery complete.
    > EXT3-fs: mounted filesystem with ordered data mode.
    > VFS: Mounted root (ext3 filesystem) readonly.
    > Freeing unused kernel memory: 220k freed
    > Adding 2104472k swap on /dev/hda7. Priority:42 extents:1
    > mismatch in kmem_cache_free: expected cache c168fc80, got c4daca80
    > c4daca80 is ext3_inode_cache.
    > c168fc80 is skbuff_head_cache.
    > Badness in cache_free_debugcheck at mm/slab.c:1917
    > [<c1003368>] dump_stack+0x16/0x18
    > [<c1041a94>] cache_free_debugcheck+0x88/0x1d5
    > [<c10424fd>] kmem_cache_free+0x26/0x65
    > [<c10a8c01>] ext3_destroy_inode+0x17/0x19
    > [<c10784c9>] destroy_inode+0x27/0x3d
    > [<c1078837>] dispose_list+0x60/0x178
    > [<c1078f81>] prune_icache+0x363/0x399
    > [<c1078fd0>] shrink_icache_memory+0x19/0x32
    > [<c1044dd7>] shrink_slab+0x104/0x172
    > [<c104641e>] try_to_free_pages+0xbe/0x16f
    > [<c103d9a0>] __alloc_pages+0x1d3/0x393
    > [<c104037c>] kmem_getpages+0x2d/0x7f
    > [<c1041869>] cache_grow+0x155/0x2a8
    > [<c1041f1f>] cache_alloc_refill+0x285/0x2c2
    > [<c10423c6>] kmem_cache_alloc+0x5d/0x77
    > [<c1075dac>] d_alloc+0x16/0x27a
    > [<c106b2b9>] real_lookup+0x40/0xc2
    > [<c106b68e>] do_lookup+0x41/0x75
    > [<c106c3a7>] __link_path_walk+0xce5/0x1066
    > [<c106c768>] link_path_walk+0x40/0xc7
    > [<c106ca87>] path_lookup+0xec/0xf7
    > [<c106cbc9>] __user_walk+0x28/0x42
    > [<c10667b3>] vfs_lstat+0x17/0x3f
    > [<c1066d1e>] sys_lstat64+0x13/0x29
    > [<c1002c5f>] sysenter_past_esp+0x54/0x75
    > slab error in cache_free_debugcheck(): cache `ext3_inode_cache': double free, or memory outside object was overwritten
    > [<c1003368>] dump_stack+0x16/0x18
    > [<c1041ad2>] cache_free_debugcheck+0xc6/0x1d5
    > [<c10424fd>] kmem_cache_free+0x26/0x65
    > [<c10a8c01>] ext3_destroy_inode+0x17/0x19
    > [<c10784c9>] destroy_inode+0x27/0x3d
    > [<c1078837>] dispose_list+0x60/0x178
    > [<c1078f81>] prune_icache+0x363/0x399
    > [<c1078fd0>] shrink_icache_memory+0x19/0x32
    > [<c1044dd7>] shrink_slab+0x104/0x172
    > [<c104641e>] try_to_free_pages+0xbe/0x16f
    > [<c103d9a0>] __alloc_pages+0x1d3/0x393
    > [<c104037c>] kmem_getpages+0x2d/0x7f
    > [<c1041869>] cache_grow+0x155/0x2a8
    > [<c1041f1f>] cache_alloc_refill+0x285/0x2c2
    > [<c10423c6>] kmem_cache_alloc+0x5d/0x77
    > [<c1075dac>] d_alloc+0x16/0x27a
    > [<c106b2b9>] real_lookup+0x40/0xc2
    > [<c106b68e>] do_lookup+0x41/0x75
    > [<c106c3a7>] __link_path_walk+0xce5/0x1066
    > [<c106c768>] link_path_walk+0x40/0xc7
    > [<c106ca87>] path_lookup+0xec/0xf7
    > [<c106cbc9>] __user_walk+0x28/0x42
    > [<c10667b3>] vfs_lstat+0x17/0x3f
    > [<c1066d1e>] sys_lstat64+0x13/0x29
    > [<c1002c5f>] sysenter_past_esp+0x54/0x75
    > c3d7afb0: redzone 1: 0x0, redzone 2: 0x0.
    > ------------[ cut here ]------------
    > kernel BUG at <bad filename>:18422!
    > invalid operand: 0000 [#1]
    > DEBUG_PAGEALLOC
    > Modules linked in:
    > CPU: 0
    > EIP: 0060:[<c1041b46>] Not tainted VLI
    > EFLAGS: 00010002 (2.6.12-rc2-mm3)
    > EIP is at cache_free_debugcheck+0x13a/0x1d5
    > eax: c3d7a000 ebx: c3d7a000 ecx: 00001000 edx: 00000fb0
    > esi: c3d7afb0 edi: c4daca80 ebp: c2f73bb8 esp: c2f73bac
    > ds: 007b es: 007b ss: 0068
    > Process showconsole (pid: 1264, threadinfo=c2f72000 task=c2f68ac0)
    > Stack: c4d0fec4 c4daca80 c3d7bd44 c2f73be0 c10424fd c4daca80 c3d7bd44 c10a8c01
    > 00000080 00000286 c3d7bddc c2f73c2c 00000080 c2f73bf0 c10a8c01 c4daca80
    > c3d7bd44 c2f73c00 c10784c9 c3d7bddc c3d7bddc c2f73c1c c1078837 c3d7bddc
    > Call Trace:
    > [<c100334a>] show_stack+0x7a/0x82
    > [<c1003453>] show_registers+0xe9/0x153
    > [<c100369f>] die+0x15c/0x23d
    > [<c1003a79>] do_invalid_op+0x90/0x97
    > [<c1002ed3>] error_code+0x4f/0x54
    > [<c10424fd>] kmem_cache_free+0x26/0x65
    > [<c10a8c01>] ext3_destroy_inode+0x17/0x19
    > [<c10784c9>] destroy_inode+0x27/0x3d
    > [<c1078837>] dispose_list+0x60/0x178
    > [<c1078f81>] prune_icache+0x363/0x399
    > [<c1078fd0>] shrink_icache_memory+0x19/0x32
    > [<c1044dd7>] shrink_slab+0x104/0x172
    > [<c104641e>] try_to_free_pages+0xbe/0x16f
    > [<c103d9a0>] __alloc_pages+0x1d3/0x393
    > [<c104037c>] kmem_getpages+0x2d/0x7f
    > [<c1041869>] cache_grow+0x155/0x2a8
    > [<c1041f1f>] cache_alloc_refill+0x285/0x2c2
    > [<c10423c6>] kmem_cache_alloc+0x5d/0x77
    > [<c1075dac>] d_alloc+0x16/0x27a
    > [<c106b2b9>] real_lookup+0x40/0xc2
    > [<c106b68e>] do_lookup+0x41/0x75
    > [<c106c3a7>] __link_path_walk+0xce5/0x1066
    > [<c106c768>] link_path_walk+0x40/0xc7
    > [<c106ca87>] path_lookup+0xec/0xf7
    > [<c106cbc9>] __user_walk+0x28/0x42
    > [<c10667b3>] vfs_lstat+0x17/0x3f
    > [<c1066d1e>] sys_lstat64+0x13/0x29
    > [<c1002c5f>] sysenter_past_esp+0x54/0x75
    > Code: e8 bc e4 ff ff 8b 55 10 89 10 58 5a 8b 5b 0c 89 f0 31 d2 8b 4f 34 29 d8 f7 f1 3b 47 3c 72 02 0f 0b 0f af c1 8d 04 18 39 c6 74 02 <0f> 0b f6 47 39 02 74 15 6a 05 57 57 e8 1d e4 ff ff 8d 04 30 89
    >
    -
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